U.S. patent application number 15/122231 was filed with the patent office on 2016-12-22 for rolling processing device and rolling processing method.
This patent application is currently assigned to NSK Ltd.. The applicant listed for this patent is NSK Ltd.. Invention is credited to Kazuto KOBAYASHI, Yuu YASUDA.
Application Number | 20160368041 15/122231 |
Document ID | / |
Family ID | 54071369 |
Filed Date | 2016-12-22 |
United States Patent
Application |
20160368041 |
Kind Code |
A1 |
KOBAYASHI; Kazuto ; et
al. |
December 22, 2016 |
Rolling Processing Device and Rolling Processing Method
Abstract
A rolling processing device and a rolling processing method are
provided to be capable of producing annular members by
rolling-forming three or more cylindrical members at the same time
while reducing the possibility of breakage of a mandrel. For this
purpose, a rolling processing device includes a forming roll, a
support roll, and a mandrel. Plural workpieces are arranged on the
mandrel alternately in the radial direction of the mandrel. The
rolling processing method includes an arranging process for
arranging the workpieces on the mandrel and a rolling process.
Inventors: |
KOBAYASHI; Kazuto;
(Fujisawa-shi, Kanagawa, JP) ; YASUDA; Yuu;
(Fujisawa-shi, Kanagawa, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
NSK Ltd. |
Shinagawa-ku, Tokyo |
|
JP |
|
|
Assignee: |
NSK Ltd.
Shinagawa-ku, Tokyo
JP
|
Family ID: |
54071369 |
Appl. No.: |
15/122231 |
Filed: |
March 9, 2015 |
PCT Filed: |
March 9, 2015 |
PCT NO: |
PCT/JP2015/001271 |
371 Date: |
August 29, 2016 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21H 1/12 20130101 |
International
Class: |
B21H 1/12 20060101
B21H001/12 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 12, 2014 |
JP |
2014-049208 |
Claims
1. A rolling processing device comprising: a forming roll
configured to abut with an outer peripheral surface of a
cylindrical member; a support roll configured to abut with the
outer peripheral surface of the cylindrical member; and a mandrel
having an outer peripheral surface configured to abut with an inner
peripheral surface of the cylindrical member, wherein rotary shafts
of the forming roll, the support roll, and the mandrel are arranged
to be capable of getting closer to one another, wherein at least
three of the cylindrical members are arranged on the outer
peripheral surface of the mandrel alternately in a radial direction
of the mandrel, wherein a plurality of protrusions, each having a
disc shape, are provided on the forming roll and the support roll
depending on the number of the cylindrical members, and wherein
outer peripheral surfaces of the plurality of protrusions of at
least one of the forming roll or the support roll are pressed
against the outer peripheral surface of the cylindrical member.
2. The rolling processing device according to claim 1, wherein at
least a first engaging groove is provided on the outer peripheral
surface of the mandrel, the first engaging groove having a diameter
decreasing in an axial direction of the mandrel, and being
configured to abut the inner peripheral surfaces of the three or
more of the cylindrical members alternately in the radial direction
of the mandrel.
3. The rolling processing device according to claim 2, wherein a
second engaging groove is provided on the outer peripheral surface
of at least one of the forming roll or the support roll to be
engaged with the outer peripheral surface of the cylindrical member
and an end surface in the axial direction of the cylindrical member
to correspond to the first engaging groove.
4. The rolling processing device according to claim 1, wherein a
plurality of the first engaging grooves are provided depending on
the number of the cylindrical members.
5. The rolling processing device according to claim 1, wherein a
pair of rotating bodies are provided on at least one of the forming
roll or the support roll to be arranged rotatably with respect to
the forming roll and the support roll, which are opposed to each
other in the axial direction, and are configured to bias both end
surfaces of the cylindrical member in the axial direction.
6. A rolling processing method comprising: an arranging process for
arranging a cylindrical member in a rolling processing device
comprising a forming roll configured to abut with an outer
peripheral surface of the cylindrical member, a support roll
configured to abut with the outer peripheral surface of the
cylindrical member, and a mandrel having an outer peripheral
surface configured to abut with an inner peripheral surface of the
cylindrical member, rotary shafts of the forming roll, the support
roll, and the mandrel being arranged to be capable of getting
closer to one another; and a rolling-forming process for
rolling-forming the cylindrical member to expand a diameter of the
cylindrical member by use of the forming roll and the mandrel to
produce annular members, wherein the arranging process is a process
for arranging at least three of the cylindrical members in an axial
direction of the mandrel with respect to a first engaging groove
provided on the outer peripheral surface of the mandrel such that
the inner peripheral surfaces of the at least three f the
cylindrical members abut alternately in a radial direction of the
mandrel and an outer peripheral surface of at least one of the
protrusions of the forming roll or the support roll abuts with the
outer peripheral surface of the cylindrical member.
7. The rolling processing method according to claim 6, wherein a
plurality of the first engaging grooves are provided depending on
the number of the cylindrical members.
8. The rolling processing method according to claim 6, wherein a
pair of rotating bodies are provided on at least one of the forming
roll or the support roll to be arranged rotatably with respect to
the forming roll and the support roll, which are opposed to each
other in the axial direction, and are configured to bias both end
surfaces of the cylindrical member in the axial direction.
Description
TECHNICAL FIELD
[0001] The present invention relates to rolling processing devices
and rolling processing methods, and relates to a rolling processing
device for producing annular members applied to inner rings and
outer rings of, for example, a rolling bearing, and a rolling
processing method using the same.
BACKGROUND ART
[0002] The annular members conventionally applied to the inner
rings and outer rings of the rolling bearings and the like are
produced by rolling (press) processing of annular workpieces.
Examples of such rolling processing include the method disclosed in
PTL 1. As illustrated in FIG. 16, a rolling processing device 100
including a support roll 101, a forming roll 102, and a mandrel 103
is used in the conventional rolling processing. A workpiece 104 is
arranged such that the inner surface of the workpiece 104 abuts
with the outer peripheral surface of the mandrel 103, and the outer
peripheral surface of the workpiece 104 abuts with the inner
peripheral surface of the forming roll 102. After that, the
workpiece 104 is pressed by rotating the forming roll 102 and the
mandrel 103 while making a rotary shaft of the forming roll 102 get
closer to a rotary shaft of the mandrel 103, and is formed into an
annular member.
[0003] In addition, PTL 2 discloses the technology for offsetting
the bending moment and preventing breakage of the mandrel 103 in
such a rolling processing device. PTL 2 addresses the offset of the
bending moment with a mechanical structure.
[0004] The technologies disclosed in PTL 1 and PTL 2 are, however,
those for forming a single annular member from a single workpiece
in a single rolling process. Thus, the working efficiency has room
for improvement.
[0005] In order to increase the productivity of forming annular
members, PTL 3 discloses a technology for cold rolling two
workpieces applied to a taper bearing all at one time.
CITATION LIST
Patent Literature
[0006] PTL 1: JP 62-176627 A [0007] PTL 2: JP 56-111533 A [0008]
PTL 3: JP 2006-320927 A
SUMMARY
Technical Problem
[0009] In the technology disclosed in PTL 3, plural workpieces are
produced by rolling at the same time, however, its intended use is
limited to the taper bearing. Besides, the technology disclosed in
PTL 3 is not suitable for rolling three or more workpieces at the
same time.
[0010] When three or more workpieces are subject to the rolling
process at the same time, as illustrated in FIG. 17, the load in
the process also corresponds to three workpieces (approximately
three times), and increases the distance between support points D.
This results in an increase in the possibility of breaking the
mandrel 103. This is because the forming force corresponding to
three workpieces (approximately three times) is applied to the
mandrel 103 in the same direction, and thus increases bending
applied to the mandrel 103.
[0011] The present invention has been made in view of the
above-described circumstances, and an object of the present
invention is to provide a rolling processing device and a rolling
processing method capable of producing annular members by rolling
three or more workpieces at the same time and reducing the
possibility of breakage of a mandrel.
Solution to Problem
[0012] In order to address the above problems, according to one
aspect of the present invention, there is provide a rolling
processing device including: a forming roll configured to abut with
an outer peripheral surface of a cylindrical member; a support roll
configured to abut with the outer peripheral surface of the
cylindrical member; and a mandrel having an outer peripheral
surface configured to abut with an inner peripheral surface of the
cylindrical member. Rotary shafts of the forming roll, the support
roll, and the mandrel are arranged to be capable of getting closer
to one another, at least three of the cylindrical members are
arranged on the outer peripheral surface of the mandrel alternately
in a radial direction of the mandrel, a plurality of protrusions,
each having a disc shape, are provided on the forming roll and the
support roll depending on the number of the cylindrical members,
and outer peripheral surfaces of the plurality of protrusions of at
least one of the forming roll or the support roll are pressed
against the outer peripheral surface of the cylindrical member.
[0013] In the above-described rolling processing device, at least a
first engaging groove is provided on the outer peripheral surface
of the mandrel, the first engaging groove having a diameter
decreasing in an axial direction of the mandrel, and being
configured to abut the inner peripheral surfaces of the three or
more of the cylindrical members alternately in the radial direction
of the mandrel.
[0014] In addition, in the above-described rolling processing
device, a second engaging groove may be provided on the outer
peripheral surface of at least one of the forming roll or the
support roll to be engaged with the outer peripheral surface of the
cylindrical member and an end surface in the axial direction of the
cylindrical member to correspond to the first engaging groove.
[0015] In addition, in the above-described rolling processing
device, a plurality of the first engaging grooves may be provided
depending on the number of the cylindrical members.
[0016] In addition, in the above-described rolling processing
device, a pair of rotating bodies may be provided on at least one
of the forming roll or the support roll to be arranged rotatably
with respect to the forming roll and the support roll, which are
opposed to each other in the axial direction, and are configured to
bias both end surfaces of the cylindrical member in the axial
direction.
[0017] Further, according to another aspect of the present
invention, there is provided a rolling processing method comprising
an arranging process for arranging a cylindrical member in a
rolling processing device comprising a forming roll configured to
abut with an outer peripheral surface of the cylindrical member, a
support roll configured to abut with the outer peripheral surface
of the cylindrical member, and a mandrel having an outer peripheral
surface configured to abut with an inner peripheral surface of the
cylindrical member, rotary shafts of the forming roll, the support
roll, and the mandrel being arranged to be capable of getting
closer to one another; and a rolling-forming process for
rolling-forming the cylindrical member to expand a diameter of the
cylindrical member by use of the forming roll and the mandrel to
produce annular members. The arranging process is a process for
arranging at least three of the cylindrical members in an axial
direction of the mandrel with respect to a first engaging groove
provided on the outer peripheral surface of the mandrel such that
the inner peripheral surfaces of the at least three of the
cylindrical members abut alternately in a radial direction of the
mandrel and an outer peripheral surface of at least one of the
protrusions of the forming roll or the support roll abuts with the
outer peripheral surface of the cylindrical member.
[0018] Herein, in the above-described rolling processing method, a
plurality of the first engaging grooves may be provided depending
on the number of the cylindrical members.
[0019] In addition, in the above-described rolling processing
method, a pair of rotating bodies may be provided on at least one
of the forming roll or the support roll to be arranged rotatably
with respect to the forming roll and the support roll, which are
opposed to each other in the axial direction, and are configured to
bias both end surfaces of the cylindrical member in the axial
direction.
Advantageous Effects
[0020] In one embodiment of the present invention, a rolling
processing device and a rolling processing method capable of
producing annular members by rolling-forming three or more
workpieces at the same time while reducing the possibility of
breakage of a mandrel can be provided.
BRIEF DESCRIPTION OF DRAWINGS
[0021] FIG. 1 is a cross-sectional view of a state where workpieces
are arranged (arranging process) in a rolling processing device and
a rolling processing method, in a first embodiment of the present
invention;
[0022] FIG. 2 is a cross-sectional view of a state where
rolling-forming process of one side of the workpieces is completed
(rolling process) in the rolling processing device and the rolling
processing method, in the first embodiment of the present
invention;
[0023] FIG. 3 is a cross-sectional view of a state where the
rolling-forming process of the workpieces is completed in the
rolling processing device and the rolling processing method, in the
first embodiment of the present invention;
[0024] FIG. 4 is a cross-sectional view of a state where the
rolling-forming process of workpieces is completed in the rolling
processing device and the rolling processing method in one
variation of the first embodiment of the present invention;
[0025] FIG. 5A and FIG. 5B are cross-sectional views of a state
where the rolling-forming process of workpieces is completed in the
case where the number of the workpieces is 2 (FIG. 5A) and the
number of the workpieces is 4 (FIG. 5B) the rolling processing
device and the rolling processing method, in another variation of
the first embodiment of the present invention;
[0026] FIG. 6 is a cross-sectional view of a state where workpieces
are arranged (arranging process) in the rolling processing device
and the rolling processing method, in a second embodiment of the
present invention;
[0027] FIG. 7 is a cross-sectional view of a state where the
rolling-forming process of one side of the workpieces is completed
(rolling process) in the rolling processing device and the rolling
processing method, in the second embodiment of the present
invention;
[0028] FIG. 8 is a cross-sectional view of a state where the
rolling-forming process of the workpieces is completed in the
rolling processing device and the rolling processing method, in the
second embodiment of the present invention;
[0029] FIG. 9 is a cross-sectional view of a state where
rolling-forming process of workpieces is completed in the rolling
processing device and the rolling processing method, in one
variation of the second embodiment of the present invention;
[0030] FIG. 10A and FIG. 10B are cross-sectional views of a state
where rolling-forming process of workpieces is completed in the
case where the number of the workpieces is 2 (FIG. 10A) and the
number of the workpieces is 4 (FIG. 10B) in the rolling processing
device and the rolling processing method, in another variation of
the second embodiment of the present invention;
[0031] FIG. 11A is a cross-sectional view of a state where
workpieces are arranged (arranging process) in the rolling
processing device and the rolling processing method, in a third
embodiment of the present invention;
[0032] FIG. 11B is an enlarged view of a main part;
[0033] FIG. 12A and FIG. 12B are cross-sectional views of a state
where workpieces are arranged (arranging process) in the case where
the number of the workpieces is 2 (FIG. 12A) and the number of the
workpieces is 4 (FIG. 12B) in the rolling processing device and the
rolling processing method, in one variation of the third embodiment
of the present invention;
[0034] FIG. 13 is a cross-sectional view of a state where
rolling-forming process of workpieces is completed in the rolling
processing device and the rolling processing method, in a fourth
embodiment of the present invention;
[0035] FIG. 14 is an enlarged view of a main part of FIG. 13;
[0036] FIG. 15A is a cross-sectional view of a state when
rolling-forming process of two workpieces is completed in the
rolling processing device and the rolling processing method, in one
variation of the fourth embodiment of the present invention;
[0037] FIG. 15B is a cross-sectional view of a state where
rolling-forming process of four workpieces is completed, in the
rolling processing device and the rolling processing method, in
another variation of the fourth embodiment of the present
invention;
[0038] FIG. 16 is a cross-sectional view of a state when a
workpiece is rolling-processed in a conventional rolling processing
device; and
[0039] FIG. 17 is a cross-sectional view of a state when three or
more workpieces are rolling-processed in the conventional rolling
processing device.
DESCRIPTION OF EMBODIMENTS
[0040] In the following detailed description, a number of specific
details will be described for providing complete understanding of
embodiments of the present invention. However, it is apparent that
one or more embodiments should be practicable without such specific
details. In addition, well-known structures and devices are
illustrated by schematic diagrams for simplifying the drawings.
[0041] Hereinafter, a rolling processing device and a rolling
processing method in some embodiments of the present invention will
be described with reference to the drawings.
First Embodiment
[0042] FIG. 1 is a cross-sectional view of a state where workpieces
are set in the rolling processing device and the rolling processing
method, in a first embodiment of the present invention.
Rolling Processing Device
[0043] As illustrated in FIG. 1, a rolling processing device 1 in
the present embodiment includes a forming roll 10, a support roll
20, and a mandrel 30. The forming roll 10, the support roll 20, and
the mandrel 30 respectively include rotary shafts 11, 21, and 31,
which are respectively arranged parallel to one another, and are
respectively arranged rotatably around the rotary shafts 11, 21,
and 31.
Forming Roll
[0044] In the forming roll 10, plural disc-shaped protrusions 12
(12A, 12B, and 12C) are provided on the rotary shaft 11 at a
predetermined interval in the axial direction. Such a predetermined
interval is same in dimension as the thickness of cylindrical
members (workpieces) 4 in the axial direction at the completion of
processing. The cylindrical members 4 are the targets to be
rolling-formed. In other words, the rolling processing device in
the present embodiment is configured to set the above-described
intervals of the protrusions 12A, 12B, and 12C, and has a function
of limiting the workpieces 4 not to extend in the axial direction
in a rolling process. It is to be noted that the protrusion 12B of
the protrusions 12A, 12B, and 12C abuts with an outer peripheral
surface 4b of the workpiece 4. Thus, the protrusion 12B presses the
outer peripheral surface of the mandrel 30 through the workpiece 4.
The forming roll 10 is arranged rotatably together with the mandrel
30 with the protrusion 12B abutting with the mandrel 30 through the
workpiece 4. Although the protrusions 12 can be integrally formed
with the rotary shaft 11, the protrusions 12 as separate bodies may
be fixed on the rotary shaft 11 in a method such as screwing,
welding, or bonding. In the case of integral forming, the forming
roll 10 having high strength and rigidity can be produced, but the
manufacturing cost may be increased, because the forming roll 10 is
manufactured by cutting or forging a cylindrical material having a
large diameter. In contrast, in a configuration in which the
protrusions 12 as separate bodies are joined to the rotary shaft 11
by welding, the strength and rigidity are slightly lower than those
of the protrusions 12 that are integrally formed, but the material
cost and the processing cost can be reduced. In addition, in the
case of screwing, even when a part of the forming roll 10 is
damaged when used, its use can be continued by replacing only the
damaged part. Furthermore, the protrusions 12 of various sizes can
be attached to the rotary shaft 11. Thus, the forming roll 10 can
be applied to various kinds and the manufacturing cost of annular
members can be reduced.
Mandrel
[0045] The mandrel 30 has a cylindrical-shaped main body 30A having
an outer diameter smaller than the inner diameter of the workpiece
4. It is to be noted that, in FIG. 1, the rotary shaft 31 of the
mandrel 30 also serves as the main body 30A.
[0046] As will be described below, inner peripheral surfaces 4a of
three or more workpieces 4 abut with the main body 30A alternately
in the radial direction of the mandrel 30, and the mandrel 30 is
rotatable together with the forming roll 10 through the workpieces
4.
Support Roll
[0047] Plural disc-shaped protrusions 22 (22A and 22B) are provided
on the support roll 20 at a predetermined interval in the axial
direction. The predetermined interval can be almost the same in
dimension as the thickness of the cylindrical members (workpieces)
4 in the axial direction at the completion of processing. Each of
the protrusions 22A and 22B abuts with the outer peripheral surface
4b of the workpiece 4, and is arranged rotatably together with the
rotary shaft 21. Although the protrusions 22 can be integrally
formed with the rotary shaft 21, the protrusions 22 as separate
bodies may be fixed on the rotary shaft 21 in a method such as
screwing, welding, or bonding. Advantages obtained when the
protrusions 22 are integrally formed or separately formed are
similar to those in the case of the forming roll 10. The
protrusions 12 of the forming roll 10 and the protrusions 22 of the
support roll 20 may be integrally formed or separately formed, as
necessary.
[0048] Here, plural protrusions 12 and the plural protrusions 22
are provided depending on the number of the workpieces 4. For
example, when n is the number of the workpieces 4, m is the number
of the protrusions 12, and k is the number of the protrusions 22,
the protrusions 12 and the protrusions 22 are provided so as to
satisfy n+2=m+k.
[0049] The protrusions 22A and 22B of the support roll 20
configured in this manner abut with the outer peripheral surface of
the mandrel 30 through the workpieces 4, and are arranged rotatably
together with the mandrel 30.
Rolling Processing Method
[0050] Next, the rolling processing method using the
above-described rolling processing device 1 in one embodiment will
be described below with reference to the drawings.
[0051] In the rolling processing device 1, the position of one of
the forming roll 10 or the support roll 20 is fixed, whereas the
other includes an inherent drive source to be capable of performing
translational motion actively. The mandrel 30 is arranged to be
capable of translating and rotating passively in accordance with a
deformation of the workpieces 4. It is to be noted that each of the
forming roll 10 and the support roll 20 includes a drive source for
active rotation, which is not illustrated.
[0052] The present embodiment will be described under the
presumption that the position of the rotary shaft 21 of the support
roll 20 is fixed, the rotary shaft 11 of the forming roll 10 is
arranged to be capable of performing translational motion by the
above-described drive source, the mandrel 30 rotates passively in
accordance with the deformation of the workpieces 4, and the rotary
shaft 31 of the mandrel 30 is arranged to be capable of translating
passively in accordance with the deformation of the workpieces 4.
Such a configuration eliminates the need of positional control,
except for the forming roll 10. The configuration of the rolling
processing device 1 is simplified. It is to be noted that, in one
variation, the mandrel 30 may be fixed, and the forming roll 10 and
the support roll 20 may perform the translational motion toward the
mandrel 30.
[0053] In such a variation, the forming roll 10 and the support
roll 20 may be driven independently, or one of the rolls may be
rotated and the other of the rolls and the mandrel may be rotated
dependently.
[0054] The rolling processing method in the present embodiment
includes at least an arranging process and a rolling process, and
may include another process as necessary. In the present
embodiment, there are some specific technical aspects in the
arranging process.
Arranging Process
[0055] As illustrated in FIG. 1, in the above-described arranging
process, plural (for example, three) workpieces 4 is arranged such
that respective end surfaces of the protrusions 12 of the forming
roll 10 and the protrusions 22 of the support roll 20 abut with the
outer peripheral surfaces 4b of the plural workpieces 4. The
workpieces 4 are inserted into the mandrel 30.
[0056] In the arranging process in the present embodiment, plural
(for example, three) workpieces 4 are arranged such that the inner
peripheral surfaces 4a of the plural workpieces 4 are arranged
alternately in the radial direction of the mandrel 30 with respect
to the main body 30A of the mandrel 30, and the outer peripheral
surfaces 4b of the workpieces 4 abut with the outer peripheral
surfaces of the protrusions 12 and the protrusions 22.
[0057] As illustrated in FIG. 1, in this situation, a workpiece 4A
and a workpiece 4B are arranged such that the outer peripheral
surface of the protrusion 22A abuts with the outer peripheral
surface 4b of the workpiece 4A, and one end surface of the
protrusion 22A in the axial direction abuts with one end surface of
the workpiece 4B in the axial direction. In addition, as
illustrated in FIG. 1, the workpiece 4B and a workpiece 4C are
arranged such that the outer peripheral surface of the protrusion
22B abuts with the outer peripheral surface 4b of the workpiece 4C,
and one end surface of the protrusion 22B in the axial direction
abuts with the other end surface of the workpiece 4B in the axial
direction. In other words, the workpiece 4B is arranged to be
sandwiched between the protrusion 22A and the protrusion 22B in the
axial direction to limit the movement in the axial direction.
[0058] On the other hand, the forming roll 10 is arranged such that
one end surface of the protrusion 12A of the forming roll 10 abuts
with one end surface (for example, upper end surface) of the
workpiece 4A in the axial direction to limit the movement of the
workpiece 4A in one (upward) direction. In addition, the protrusion
12B is arranged such that the outer peripheral surface thereof
abuts with the outer peripheral surface 4b of the workpiece 4B, one
end surface thereof abuts with the other end surface (for example,
lower end surface) of the workpiece 4A in the axial direction, and
the other end surface thereof abuts with one end surface (for
example, upper end surface) of the workpiece 4C in the axial
direction. This configuration limits the movement of the workpiece
4A in the other (downward) direction and the movement of the
workpiece 4C in one (upward) direction. Similarly, the protrusion
12C abuts with the other end surface (for example, lower end
surface) of the workpiece 4C in the axial direction, and is
arranged to limit the movement of the workpiece 4C in the other
(downward) direction.
Rolling Process
[0059] The above-described rolling process is a rolling-forming
process that extends the diameters of the workpieces 4A, 4B, and
4C, by the movement of the forming roll 10, to produce the annular
members 2. Inner surfaces 4a of the workpieces 4A, 4B, and 4C
alternately abut with an outer peripheral surface 30a of the main
body 30A of the mandrel 30.
[0060] Specifically, the forming roll 10 is moved in a direction in
which a distance between the rotary shaft 31 of the mandrel 30 and
the rotary shaft 11 of the forming roll 10 reduces, by a drive
source that is not illustrated, while rotating the protrusions 12A,
12B, and 12C of the forming roll 10 by the above-described drive
source. Accordingly, the workpiece 4B is sandwiched between the
protrusion 12B of the forming roll 10 and the outer surface 30a of
the mandrel 30, and the workpiece 4B is rolled.
[0061] When the rolling of the workpiece 4B is completed, the
protrusions 12A and 12C of the forming roll 10 abut with the outer
peripheral surface 30a of the mandrel 30. After that, as
illustrated in FIG. 2, the forming roll 10 is further made to
perform the translational motion, and the protrusions 12A and 12C
of the forming roll 10 press the mandrel 30, so that the mandrel 30
performs rotation and translational motion passively, and the
workpieces 4A and 4C sandwiched between the outer peripheral
surface 30a of the mandrel 30 and the protrusions 22A and 22B of
the support roll 20 are rolled.
[0062] In the present embodiment, the rolling force F exerted from
the forming roll 10 is transmitted through a path of the forming
roll 10, the workpiece 4B, the mandrel 30, the workpieces 4A and
4C, and the support roll 20, in this order. In other words, the
rolling force F is exerted to the workpiece 4B, and the rolling
force F/2 is applied to each of the workpieces 4A and 4C. Thus, the
workpiece 4B deforms faster than the workpieces 4A and 4C. After
that, the rolling by the protrusions 12A, 12B, and 12C is
progressed, and the rolling-forming process of the workpieces 4A,
4B and 4C is completed when the thicknesses of the workpieces 4A,
4B and 4C in the radial direction reach predetermined thicknesses
(see FIG. 3).
[0063] As described above, the workpieces 4 are arranged
alternately in the radial direction with respect to the mandrel 30
in the present embodiment, so that the force alternately acts on
the mandrel 30 as illustrated in FIG. 3. Bending that occurs in the
mandrel 30 can be reduced while forming the workpieces 4. This
means that, in a configuration of a general rolling processing
device, forming of workpieces plays the role of a support roll (a
roll that presses a mandrel).
[0064] In addition, the inter-fulcrum distance D between the
protrusions 22A and 22B of the support roll 20 is almost the same
as the inter-fulcrum distance in the case where only a single
workpiece 4 is rolling-processed. In other words, almost the same
force as that in the case where one workpiece 4 is rolling-formed
is exerted to the mandrel 30 by the arrangement of the plural
workpieces 4 in the present embodiment. Thus, more workpieces 4 can
be rolling-formed at the same time while preventing breakage of the
mandrel 30.
[0065] Here, as another variation of the present embodiment, as
illustrated in FIG. 4, the number of the workpieces 4 that are
rolling-formed at the same time can be increased. For example, five
workpieces 4 can be rolling-formed at the same time as illustrated
in FIG. 4. Even if still more workpieces 4 are formed at the same
time, as illustrated in FIG. 4, the workpieces 4 arranged
alternately that are rolled suppress the bending that may occur in
the mandrel 30. Accordingly, more workpieces 4 can be
rolling-formed at the same time without worrying about the breakage
of the mandrel 30.
[0066] In addition, in the conventional rolling processing device,
when the protrusions are made to support the mandrel, considerable
space is necessary in the width direction. However, the mandrel is
supported by the forming force of the workpieces as in the present
embodiment. Therefore, a rolling processing device capable of
rolling-forming plural workpieces at the same time with a compact
size is provided.
[0067] In addition, in another variation of the present embodiment,
as illustrated in FIG. 5A and FIG. 5B, the number of the workpieces
4 that are rolling-formed at the same time can be not odd numbers
but even numbers. For example, as illustrated in FIG. 5A, two
workpieces 4A and 4B can be rolling-formed at the same time.
Specifically, the workpiece 4A and the workpiece 4B are arranged
such that the outer peripheral surface of the protrusion 22A abuts
with the outer peripheral surface 4b of the workpiece 4A, and one
end surface of the protrusion 22A in the axial direction abuts with
one end surface of the workpiece 4B in the axial direction. In
addition, the workpiece 4B is arranged such that one end surface of
the protrusion 22B in the axial direction abuts with the other end
surface of the workpiece 4B in the axial direction. In other words,
the workpiece 4B is arranged to be sandwiched between the
protrusion 22A and the protrusion 22B in the axial direction to
limit the movement in the axial direction.
[0068] On the other hand, the forming roll 10 is arranged such that
one end surface of the protrusion 12A of the forming roll 10 abuts
with one end surface (for example, upper end surface) of the
workpiece 4A in the axial direction to limit the movement of the
workpiece 4A in one (upward) direction. In addition, the protrusion
12B is arranged such that the outer peripheral surface thereof
abuts with the outer peripheral surface 4b of the workpiece 4B, and
one end surface thereof abuts with the other end surface (for
example, lower end surface) of the workpiece 4A in the axial
direction. Accordingly, the movement of the workpiece 4A in the
other (downward) direction is limited.
[0069] In addition, as illustrated in FIG. 5B, four workpieces 4A
to 4D can be rolling-formed at the same time. Specifically, three
disc-shaped protrusions 22 (22A, 22B, and 22C) are provided on the
support roll 20 at predetermined intervals in the axial
direction.
[0070] The workpiece 4A and the workpiece 4B are arranged such that
the outer peripheral surface of the protrusion 22A abuts with the
outer peripheral surface 4b of the workpiece 4A, and one end
surface of the protrusion 22B in the axial direction abuts with one
end surface of the workpiece 4B in the axial direction. In
addition, the workpiece 4B and the workpiece 4C are arranged such
that the outer peripheral surface of the protrusion 22B abuts with
the outer peripheral surface 4b of the workpiece 4C, and one end
surface of the protrusion 22B in the axial direction abuts with the
other end surface of the workpiece 4B in the axial direction. In
addition, the workpiece 4C and the workpiece 4D are arranged such
that the outer peripheral surface of the protrusion 22B abuts with
the outer peripheral surface 4b of the workpiece 4C, and one end
surface of the protrusion 22C in the axial direction abuts with one
end surface of the workpiece 4D in the axial direction.
[0071] In other words, the workpiece 4B is arranged to be
sandwiched between the protrusion 22A and the protrusion 22B in the
axial direction to limit the movement in the axial direction. In
addition, the workpiece 4D is arranged to be sandwiched between the
protrusion 22B and the protrusion 22C in the axial direction to
limit the movement in the axial direction.
[0072] On the other hand, the forming roll 10 is arranged such that
one end surface of the protrusion 12A of the forming roll 10 in the
axial direction abuts with one end surface (for example, upper end
surface) of the workpiece 4A in the axial direction to limit the
movement of the workpiece 4A in one (upward) direction. In
addition, the protrusion 12B is arranged such that the outer
peripheral surface thereof abuts with the outer peripheral surface
4b of the workpiece 4B, one end surface thereof in the axial
direction abuts with the other end surface (for example, lower end
surface) of the workpiece 4A in the axial direction, and the other
end surface thereof abuts with one end surface (for example, upper
end surface) of the workpiece 4C in the axial direction. In
addition, the protrusion 12C is arranged such that the outer
peripheral surface thereof abuts with the outer peripheral surface
4b of the workpiece 4D, and one end surface thereof in the axial
direction abuts with one end surface (for example, upper end
surface) of the workpiece 4C in the axial direction.
[0073] This configuration limits the movement of the workpiece 4A
in the other (downward) direction and the movement of the workpiece
4C in one (upward) direction. Similarly, the protrusion 12C abuts
with the other end surface (for example, lower end surface) of the
workpiece 4C in the axial direction, and is arranged to limit the
movement of the workpiece 4C in the other (downward) direction.
[0074] It is to be noted that, when the number of the workpieces 4
that are rolling-formed at the same time but an even number in this
manner, instead of an odd number, by setting the rigidity and the
support rigidity of the mandrel 30 so as to resist the moment for
inclining the mandrel 30, the bending that may occur in the mandrel
30 can be suppressed. Accordingly, more workpieces 4 can be
rolling-formed at the same time without worrying about the breakage
of the mandrel 30.
[0075] As described above, according to the rolling processing
device and the rolling processing method in the present embodiment,
annular members can be produced by rolling-forming three or more
cylindrical members at the same time while reducing the possibility
of breakage of the mandrel. Accordingly, plural cylindrical members
can be formed in a processing period of time almost the same as the
conventional one, and the productivity can be drastically
increased. In addition, in the present embodiment, plural
workpieces can be rolling-formed at the same time without worrying
about the breakage of a mandrel.
Second Embodiment
[0076] FIG. 6 is a cross-sectional view of a state where workpieces
are set in the rolling processing device and the rolling processing
method, in a second embodiment of the present invention.
Rolling Processing Device
[0077] As illustrated in FIG. 6, a rolling processing device 1 of
the present embodiment has a forming roll 10, a support roll 20,
and a mandrel 30. The forming roll 10, the support roll 20, and the
mandrel 30 have rotary shafts 11, 21, 31 respectively arranged
parallel to one another, and are respectively arranged rotatably
around the rotary shafts 11, 21, 31.
Forming Roll
[0078] In the forming roll 10, plural disc-shaped protrusions 12
(12A, 12B, and 12C) are provided on the rotary shaft 11 at
predetermined intervals in the axial direction. It is preferable
that the predetermined intervals have almost the same dimensions as
the thickness dimensions of cylindrical members (workpieces) 4,
which are targets to be rolling-formed, in the axial direction at
the completion of processing. In other words, the rolling
processing device of the present embodiment, which sets the
intervals of the protrusions 12A, 12B, and 12C as described above,
has a limiting function by which the workpieces 4 are not spread in
the axial direction in a rolling process. It is to be noted that
the protrusion 12B among the protrusions 12A, 12B, and 12C abuts
with an outer peripheral surface 4b of the workpiece 4. Thus, the
protrusion 12B presses the outer peripheral surface of the mandrel
30 through the workpiece 4. The forming roll 10 is arranged
rotatably together with the mandrel 30 with the protrusion 12B
thereof being in contact with the mandrel 30 through the workpiece
4.
Mandrel
[0079] The mandrel 30 includes a cylindrical-shaped main body 30A
having an outer diameter smaller than the inner diameter of the
workpiece 4, and a first engaging groove 32. The diameter of the
first engaging groove 32 decreases in the axial direction of the
rotary shaft 31 of the mandrel 30. It is to be noted that, in FIG.
6, the rotary shaft 31 of the mandrel 30 also serves as the main
body 30A.
[0080] As described below, inner peripheral surfaces 4a of three or
more of the workpieces 4 abut with the first engaging groove 32
alternately in the radial direction of the mandrel 30, and the
mandrel 30 is rotatable together with the forming roll 10 through
the workpieces 4.
Support Roll
[0081] A plural disc-shaped protrusions 22 (22A and 22B) are
provided on the support roll 20 at a predetermined interval in the
axial direction. It is preferable that the predetermined interval
have almost the same dimension as the thickness dimensions of the
cylindrical members (workpieces) 4, which are targets to be
rolling-formed, in the axial direction at the completion of
processing. Each of the protrusions 22A and 22B abuts with the
outer peripheral surface 4b of the workpiece 4, and is arranged
rotatably together with the rotary shaft 21.
[0082] In addition, on the outer peripheral surfaces of the
protrusions 22A and 22B, and second engaging grooves 23A and 23B
that correspond to the first engaging groove 32 and are engaged
with the outer peripheral surfaces 4b and end surfaces in the axial
direction of the workpieces 4 are provided, respectively.
[0083] Here, the plural protrusions 12 and the plural protrusions
22 are provided depending on the number of the workpieces 4. For
example, when the number of the workpieces 4 is n, the number of
the protrusions 12 is m, and the number of the protrusions 22 is k,
the protrusions 12 and the protrusions 22 are provided so as to
satisfy n+2=m+k.
[0084] The protrusions 22A and 22B of the support roll 20
configured in this manner abut with the outer peripheral surface of
the mandrel 30 through the workpieces 4 and are arranged rotatably
together with the mandrel 30.
Rolling Processing Method
[0085] Next, an embodiment of the rolling processing method using
the above-described rolling processing device 1 will be described
below with reference to the drawings.
[0086] In the rolling processing device 1, the position of one of
the forming roll 10 and the support roll 20 is fixed, and the other
has an inherent drive source and can perform translational motion
actively. The mandrel 30 is arranged to be capable of performing
rotation and translational motion passively in accordance with the
deformation of the workpieces 4.
[0087] In one embodiment, described description will be given under
the presumption that the position of the rotary shaft 21 of the
support roll 20 is fixed, the rotary shaft 11 of the forming roll
10 is arranged to be capable of performing translational motion by
the above-described drive source, and the mandrel 30 is arranged to
be capable of performing rotation and translational motion
passively in accordance with the deformation of the workpieces 4.
In such a configuration, only the position of the forming roll 10
has to be controlled. Thus, the configuration of the rolling
processing device 1 is simplified. It is to be noted that, in one
variation, the position of the mandrel 30 is fixed, and the forming
roll 10 and the support roll 20 translationally move toward the
mandrel 30 may be adopted. In such a variation, the forming roll 10
and the support roll 20 may be driven independently, or a variation
in which one of the rolls is rotated, and the other roll and the
mandrel are rotated dependently may be used.
[0088] The rolling processing method of the present embodiment
includes at least an arranging process and a rolling process, and
may include another process as necessary. The present embodiment
has a specific technical feature in the arranging process.
Arranging Process
[0089] As illustrated in FIG. 6, the above-described arranging
process is a process for arranging plural (for example, three)
workpieces 4 such that respective end surfaces of the protrusions
12 of the forming roll 10 and the protrusions 22 of the support
roll 20 abut with the outer peripheral surfaces 4b of the plural
workpieces 4 into which the mandrel 30 is inserted.
[0090] Here, the arranging process of the present embodiment is a
process for arranging the plural (for example, three) workpieces 4
such that the inner peripheral surfaces 4a of the plural workpieces
4 are alternated in the radial direction of the mandrel 30 with
respect to the first engaging groove 32 of the mandrel 30, and the
outer peripheral surfaces 4b of the workpieces 4 abut with the
outer peripheral surfaces of the protrusions 12 and the protrusions
22.
[0091] As illustrated in FIG. 6, at this time, in the variation in
which the second engaging groove 23A is provided on the outer
peripheral surface of the protrusion 22A, a workpiece 4A is
arranged such that the outer peripheral surface of the second
engaging groove 23A is engaged with the outer peripheral surface 4b
of the workpiece 4A, and an end surface of the second engaging
groove 23A in the axial direction is engaged with one end surface
of the workpiece 4A in the axial direction. In addition, as
illustrated in FIG. 6, in the variation in which the second
engaging groove 23B is provided on the outer peripheral surface of
the protrusion 22B, a workpiece 4C is arranged such that the outer
peripheral surface of the second engaging groove 23A is engaged
with the outer peripheral surface 4b of the workpiece 4C, and an
end surface of the second engaging groove 23A in the axial
direction is engaged with one end surface of the workpiece 4C in
the axial direction.
[0092] In addition, the workpiece 4B is arranged to be sandwiched
between the protrusion 22A and the protrusion 22B in the axial
direction to limit the movement in the axial direction.
[0093] On the other hand, the forming roll 10 is arranged such that
one end surface of the protrusion 12A of the forming roll 10 abuts
with one end surface (for example, upper end surface) of the
workpiece 4A in the axial direction to limit the movement of the
workpiece 4A in one (upward) direction. In addition, the protrusion
12B is arranged such that the outer peripheral surface thereof
abuts with the outer peripheral surface 4b of the workpiece 4B, one
end surface thereof abuts with the other end surface (for example,
lower end surface) of the workpiece 4A in the axial direction, and
the other end surface thereof abuts with one end surface (for
example, upper end surface) of the workpiece 4C in the axial
direction. Accordingly, the movement of the workpiece 4A in the
other (downward) direction and the movement of the workpiece 4C in
one (upward) direction are limited. Similarly, the protrusion 12C
is arranged such that one end surface thereof abuts with the other
end surface (for example, lower end surface) of the workpiece 4C in
the axial direction to limit the movement of the workpiece 4C in
the other (downward) direction.
Rolling Process
[0094] The above-described rolling process is a rolling-forming
process that expands the diameters of the workpieces 4A, 4B, and 4C
having inner peripheral surfaces 4a abutting with an outer
peripheral surface 30a of the first engaging part 32 of the mandrel
30 alternately, by the movement of the forming roll 10, to produce
annular members 2.
[0095] Specifically, the forming roll 10 is moved in a direction in
which a distance between the rotary shaft 31 of the mandrel 30 and
the rotary shaft 11 of the forming roll 10 is reduced, by a drive
source that is not illustrated, while rotating the protrusions 12A,
12B, and 12C of the forming roll 10 by the above-described drive
source. Accordingly, the workpiece 4B is sandwiched between the
protrusion 12B of the forming roll 10 and the outer peripheral
surface 30a of the mandrel 30, and the workpiece 4B is rolled.
[0096] When the rolling of the workpiece 4B is completed, the
protrusions 12A and 12C of the forming roll 10 abut with the outer
peripheral surface 30a of the mandrel 30. After that, as
illustrated in FIG. 7, the forming roll 10 is further made to
perform translational motion, and the protrusions 12A and 12C of
the forming roll 10 press the mandrel 30, so that the mandrel 30
performs rotation and translational motion passively, and the
workpieces 4A and 4C sandwiched between the outer peripheral
surface 30a of the mandrel 30 and the protrusions 22A and 22B of
the support roll 20 are rolled.
[0097] In the present embodiment, the protrusion 12B of the forming
roll 10 rolls the workpiece 4B with the outer peripheral surface
thereof directly pressing the outer peripheral surface of the
workpiece 4B. At this time, the rolling force F from the forming
roll 10 is transmitted through a path of the forming roll
10.fwdarw.the workpiece 4B.fwdarw.the mandrel 30.fwdarw.the
workpieces 4A and 4C.fwdarw.the support roll 20. In other words,
the rolling force F is applied to the workpiece 4B, and the rolling
force F/2 is applied to each of the workpieces 4A and 4C. Thus, the
workpiece 4B deforms faster than the workpieces 4A and 4C. After
that, the rolling by the protrusions 12A, 12B, and 12C is
progressed, and the rolling-forming process of the workpieces 4A,
4B, and 4C is completed when the thicknesses of the workpieces 4A,
4B, and 4C in the radial direction become predetermined thicknesses
(see FIG. 8).
[0098] As described above, the workpieces 4 are arranged
alternately in the radial direction with respect to the mandrel 30
in the present embodiment, so that the force alternately acts on
the mandrel 30 as illustrated in FIG. 8, and bending that occurs in
the mandrel 30 can be reduced while forming the workpieces 4. This
means that, in a configuration of a general rolling processing
device, forming of workpieces plays the role of a support roll (a
roll that presses a mandrel).
[0099] In addition, an inter-fulcrum distance D between the
protrusions 22A and 22B of the support roll 20 is almost the same
as an inter-fulcrum distance in the case where only one workpiece 4
is rolling-processed. In other words, almost the same force as that
in the case where one workpiece 4 is rolling-formed is applied to
the mandrel 30 by the arrangement of the plural workpieces 4 in the
present embodiment. Thus, more workpieces 4 can be rolling-formed
at the same time while preventing breakage of the mandrel 30.
[0100] Here, in one variation of the present embodiment, as
illustrated in FIG. 9, the number of the workpieces 4 that are
rolling-formed at the same time can be increased. For example, five
workpieces 4 can be rolling-formed at the same time as illustrated
in FIG. 9.
[0101] At this time, second engaging grooves 13A and 13C that
correspond to the first engaging groove 32 and are engaged with the
outer peripheral surfaces 4b and end surfaces in the axial
direction of the workpieces 4A and 4E are respectively provided at
the protrusions 12A and 12C of the forming roll 10. Here, on which
protrusions 12 (22) the second engaging grooves 13 (23) are
provided is selected depending on the number of the workpieces 4 to
be processed.
[0102] As described above, even if still more workpieces 4 are
formed at the same time, as illustrated in FIG. 9, the workpieces 4
arranged alternately are rolled. Thus, bending applied to the
mandrel 30 can be suppressed. Accordingly, more workpieces 4 can be
rolling-formed at the same time without worrying about breakage of
the mandrel 30.
[0103] In addition, in the conventional rolling processing device,
when the protrusions are made to support the mandrel, considerable
space becomes necessary in the width direction. However, when the
mandrel is supported by the forming force of the workpieces as in
the present embodiment, a rolling processing device that
rolling-forms plural workpieces at the same time but is extremely
compact can be provided.
[0104] In addition, in another variation of the present embodiment,
as illustrated in FIG. 10A and FIG. 10B, the number of the
workpieces 4 that are rolling-formed at the same time can be not
odd numbers but even numbers. For example, as illustrated in FIG.
10A, two workpieces 4A and 4B can be rolling-formed at the same
time. Specifically, in another variation, the second engaging
groove 23A is provided on the outer peripheral surface of the
protrusion 22A, the workpiece 4A is arranged such that the outer
peripheral surface of the second engaging groove 23A is engaged
with the outer peripheral surface 4b of the workpiece 4A, and an
end surface of the second engaging groove 23A in the axial
direction is engaged with one end surface of the workpiece 4A in
the axial direction.
[0105] In addition, the workpiece 4B is arranged to be sandwiched
between the protrusion 22A and the protrusion 22B in the axial
direction to limit the movement in the axial direction.
[0106] On the other hand, the forming roll 10 is arranged such that
one end surface of the protrusion 12A of the forming roll 10 abuts
with one end surface (for example, upper end surface) of the
workpiece 4A in the axial direction to limit the movement of the
workpiece 4A in one (upward) direction. In addition, the protrusion
12B is arranged such that the outer peripheral surface thereof
abuts with the outer peripheral surface 4b of the workpiece 4B, and
one end surface thereof abuts with the other end surface (for
example, lower end surface) of the workpiece 4A in the axial
direction. Accordingly, the movement of the workpiece 4A in the
other (downward) direction is limited. In addition, on the
protrusion 12B, a second engaging groove 13B that corresponds to
the first engaging groove 32 and is engaged with the outer
peripheral surface 4b and the other end surface in the axial
direction of the workpiece 4B is provided. Accordingly, the
movement of the workpiece 4B in the other (downward) direction is
limited.
[0107] In addition, as illustrated in FIG. 10B, four workpieces 4A
to 4D can be rolling-formed at the same time. Specifically, three
disc-shaped protrusions 22 (22A, 22B, and 22C) are provided on the
support roll 20 at predetermined intervals in the axial
direction.
[0108] On the protrusion 22A, the second engaging groove 23A that
corresponds to the first engaging groove 32 and is engaged with the
outer peripheral surface 4b and one end surface (for example, upper
end surface) in the axial direction of the workpiece 4A is
provided.
[0109] In addition, three disc-shaped protrusions 12 (12A, 12B, and
12C) are provided on the forming roll 10 at predetermined intervals
in the axial direction. On the outer peripheral surface of the
protrusion 12C, the second engaging groove 13C that corresponds to
the first engaging groove 32 and is engaged with the outer
peripheral surface 4b and the other end surface (for example, lower
end surface) in the axial direction of the workpiece 4D is
provided.
[0110] In such a variation, the workpiece 4A is arranged such that
the outer peripheral surface of the second engaging groove 23A is
engaged with the outer peripheral surface 4b of the workpiece 4A,
and an end surface of the second engaging groove 23A in the axial
direction is engaged with one end surface of the workpiece 4A in
the axial direction. Here, the workpiece 4A is arranged to be
sandwiched between the protrusion 12A and the protrusion 12B in the
axial direction to limit the movement in the axial direction. In
addition, the workpiece 4B is arranged to be sandwiched between the
protrusion 22A and the protrusion 22B in the axial direction to
limit the movement in the axial direction. In addition, the
workpiece 4C is arranged to be sandwiched between the protrusion
22A and the protrusion 22B in the axial direction to limit the
movement in the axial direction. In addition, the workpiece 4D is
arranged such that the outer peripheral surface of the second
engaging groove 13C is engaged with the outer peripheral surface 4b
of the workpiece 4D, and an end surface of the second engaging
groove 13C in the axial direction is engaged with the other end
surface of the workpiece 4D in the axial direction. Here, the
workpiece 4D is arranged to be sandwiched between the protrusion
22B and the protrusion 22C in the axial direction to limit the
movement in the axial direction.
[0111] Here, when even numbers of the workpieces 4 are
rolling-formed at the same time, in addition to the above-described
variations with reference to FIG. 10A and FIG. 10B, by using a
rolling processing device in which the maximum number of workpieces
that can be stored is odd numbers, processing may be performed with
the number of workpieces decreased by one. For example, with
reference to FIG. 9, by using the above-described "rolling
processing device in which the number of workpieces is five", four
workpieces the number of which is smaller than the five by one can
be rolling-formed at the same time.
[0112] As described above, according to the rolling processing
device and the rolling processing method of the present embodiment,
annular members can be produced by rolling-forming three or more
cylindrical members at the same time while reducing the possibility
of breakage of a mandrel. Accordingly, plural cylindrical members
can be formed in processing time almost the same as the
conventional processing time, and the productivity can be
drastically increased. In addition, according to the present
embodiment, plural workpieces can be rolling-formed at the same
time without worrying about breakage of a mandrel.
[0113] In particular, in the present embodiment, the workpieces 4
can be prevented from increasing the widths while the workpieces 4
are being deformed by the first engaging groove 32 provided on the
mandrel 30 and the second engaging grooves 13 (23) provided on at
least one of the forming roll 10 and the support roll 20.
[0114] In addition, the first engaging groove 32 and the second
engaging grooves 13 (23) are provided to improve the workability
when the workpieces 4 are set in the mandrel 30 in the
above-described arranging process, and to improve the positioning
accuracy of the workpieces 4 in the axial direction.
Third Embodiment
[0115] Next, a third embodiment of the rolling processing device
and the rolling processing method will be described with reference
to the drawings. It is to be noted that the present embodiment is
merely different from the second embodiment in the variation of the
first engaging groove provided on the mandrel and the second
engaging grooves provided on the forming roll and the support roll.
Thus, the description of the same components denoted by the same
reference numerals as in the above-described embodiments will be
sometimes omitted. FIG. 11A and FIG. 11B are cross-sectional views
of a processing outline of annular members the rolling processing
device and the rolling processing method, in the third embodiment
of the present invention.
[0116] As illustrated in FIG. 11A and FIG. 11B, in the present
embodiment, plural first engaging grooves 32 are provided depending
on the number of the workpieces 4. Specifically, the first engaging
groove 32 with which all of the inner peripheral surfaces 4a of the
workpieces 4A, 4B, and 4C abut does not have one groove shape that
is flush in the axial direction, but plural reduced-diameter first
engaging grooves 32A, 32B, and 32C are provided on the main body
30A independently.
[0117] In addition, on the protrusion 12B of the forming roll 10,
the second engaging groove 13B that corresponds to the first
engaging groove 32B and is engaged with the outer peripheral
surface 4b and both end surfaces in the axial direction of the
workpiece 4B is provided.
[0118] In addition, on the protrusions 22A and 22B of the support
roll 20, the second engaging grooves 23A and 23B that correspond to
the first engaging grooves 32A and 32C and are engaged with the
outer peripheral surfaces 4b and both end surfaces in the axial
direction of the workpieces 4A and 4C are provided.
[0119] The workpieces 4 may extend in the axial direction in
addition to expanding of the diameters, depending on rolling
conditions, and the present embodiment is provided for solving such
a situation.
[0120] In other words, the second engaging grooves 12B, 23A, and
23B are provided as in the present embodiment, so that extending of
the workpieces 4 in the axial direction can be suppressed.
Therefore, it is possible to provide a rolling processing device
that rolling-forms plural workpieces at the same time with higher
accuracy, while keeping an inter-fulcrum distance D small, and a
rolling processing method using the above-described rolling
processing device.
[0121] In addition, as another variation of the present embodiment,
as illustrated in FIG. 12A and FIG. 12B, the number of the
workpieces 4 that are rolling-formed at the same time can be not
odd numbers but even numbers. For example, as illustrated in FIG.
12A, two workpieces 4A and 4B can be rolling-formed at the same
time. Specifically, the plural first engaging grooves 32 are
provided depending on the number of the workpieces 4. Specifically,
the first engaging groove 32 with which all of the inner peripheral
surfaces 4a of the workpieces 4A and 4B abut does not have one
groove shape that is flush in the axial direction, but plural
reduced-diameter first engaging grooves 32A, 32B are provided on
the main body 30A independently.
[0122] In addition, on the protrusion 12B of the forming roll 10,
the second engaging groove 13B that corresponds to the first
engaging groove 32B and is engaged with the outer peripheral
surface 4b and both end surfaces in the axial direction of the
workpiece 4B is provided.
[0123] In addition, on the protrusion 22A of the support roll 20,
the second engaging groove 23A that corresponds to the first
engaging groove 32A and is engaged with the outer peripheral
surface 4b and both end surfaces in the axial direction of the
workpiece 4A is provided. It is to be noted that, on the protrusion
22B of the support roll 20, the second engaging groove 23B as
illustrated in FIG. 11 is not provided.
[0124] In addition, as illustrated in FIG. 12B, four workpieces 4A
to 4D can be rolling-formed at the same time. Specifically, three
disc-shaped protrusions 22 (22A, 22B, and 22C) are provided on the
support roll 20 at predetermined intervals in the axial
direction.
[0125] The protrusion 22A includes the second engaging groove 23A
that corresponds to the first engaging groove 32A and is engaged
with the outer peripheral surface 4b and both end surfaces in the
axial direction of the workpiece 4A. In addition, the protrusion
22B includes the second engaging groove 23B that corresponds to the
first engaging groove 32C and that is engaged with the outer
peripheral surface 4b and both end surfaces in the axial direction
of the workpiece 4C.
[0126] In addition, three disc-shaped protrusions 12 (12A, 12B, and
12C) are provided on the forming roll 10 at predetermined intervals
in the axial direction. On the outer peripheral surface of the
protrusion 12B, the second engaging groove 13B that corresponds to
the first engaging groove 32B and is engaged with the outer
peripheral surface 4b and both end surfaces in the axial direction
of the workpiece 4B is provided. In addition, on the outer
peripheral surface of the protrusion 12C, the second engaging
groove 13C that corresponds to the first engaging groove 32D and is
engaged with the outer peripheral surface 4b and both end surfaces
in the axial direction of the workpiece 4D is provided.
[0127] In such a variation, the workpiece 4A is arranged such that
the outer peripheral surface of the second engaging groove 23A is
engaged with the outer peripheral surface 4b of the workpiece 4A,
and end surfaces of the second engaging groove 23A in the axial
direction are engaged with both end surfaces of the workpiece 4A in
the axial direction. Here, the workpiece 4A is arranged to be
sandwiched between the protrusion 12A and the protrusion 12B in the
axial direction to limit the movement in the axial direction.
[0128] In addition, the workpiece 4B is arranged such that the
outer peripheral surface of the second engaging groove 13B is
engaged with the outer peripheral surface 4b of the workpiece 4B,
and end surfaces of the second engaging groove 13B in the axial
direction are engaged with both end surfaces of the workpiece 4B in
the axial direction. Here, the workpiece 4B is arranged to be
sandwiched between the protrusion 22A and the protrusion 22B in the
axial direction to limit the movement in the axial direction.
[0129] In addition, the workpiece 4C is arranged such that the
outer peripheral surface of the second engaging groove 23B is
engaged with the outer peripheral surface 4b of the workpiece 4C,
and end surfaces of the second engaging groove 23B in the axial
direction are engaged with both end surfaces of the workpiece 4C in
the axial direction. Here, the workpiece 4C is arranged to be
sandwiched between the protrusion 12B and the protrusion 12C in the
axial direction to limit the movement in the axial direction.
[0130] In addition, the workpiece 4D is arranged such that the
outer peripheral surface of the second engaging groove 13C is
engaged with the outer peripheral surface 4b of the workpiece 4D,
and end surfaces of the second engaging groove 13C in the axial
direction are engaged with both end surfaces of the workpiece 4D in
the axial direction. Here, the workpiece 4D is arranged to be
sandwiched between the protrusion 22B and the protrusion 22C in the
axial direction to limit the movement in the axial direction.
[0131] Here, when even numbers of the workpieces 4 are
rolling-formed at the same time, in addition to the above-described
variations with reference to FIG. 12A and FIG. 12B, by using a
rolling processing device in which the maximum number of workpieces
that can be stored is odd numbers, processing may be performed with
the number of workpieces decreased by one. For example, by using a
"rolling processing device in which the number of workpieces is
five", four workpieces the number of which is smaller than the five
by one can be rolling-formed at the same time.
Fourth Embodiment
[0132] Next, a fourth embodiment of the rolling processing device
and the rolling processing method will be described with reference
to the drawings. It is to be noted that the present embodiment is
merely different from the second embodiment in that a rotating body
is provided. Thus, the description of the same components denoted
by the same reference numerals as in the above-described
embodiments will be sometimes omitted. FIG. 13 and FIG. 14 are
cross-sectional views of a processing outline of annular members in
the rolling processing device and the rolling processing method, in
the fourth embodiment of the present invention.
[0133] As illustrated in FIG. 13 and FIG. 14, in the present
embodiment, pairs of rotating bodies 50 that bias both end surfaces
of the workpieces 4 in the axial direction are provided on the
forming roll 10 and the support roll 20. The rotating bodies 50
each have a rotary shaft, and are radially and rotatably arranged
on end surfaces of the protrusions 12 and the protrusions 22 in the
axial direction, which are opposed to one another in the axial
direction. It is to be noted that the rotating bodies 50 may be
arranged on at least one of the forming roll 10 and the support
roll 20, and are preferably arranged on the forming roll 10 and the
support roll 20.
[0134] The workpieces 4 may extend in the axial direction in
addition to expanding of the diameters, depending on rolling
conditions, and the present embodiment is a variation for solving
it, as in the third embodiment. Hereinafter, the workpiece 4B will
be specifically described as an example. As illustrated in FIG. 14,
on the side where the inner peripheral surface 4a of the workpiece
4B abuts with the outer peripheral surface of the first engaging
groove 32 of the mandrel 30, the workpiece 4B is sandwiched by the
outer peripheral surface of the protrusion 12B in the radial
direction. In addition, on the opposite side in the radial
direction from the side in contact with the outer peripheral
surface of the first engaging groove 32, both end surfaces of the
workpiece 4B in the axial direction are sandwiched between the pair
of rotating bodies 50B, 50B provided on the inner surface sides of
the protrusions 22A and 22B in the axial direction, which are
opposed to each other.
[0135] In the case where the workpiece 4B arranged in this manner,
on the side in contact with the outer peripheral surface 30a of the
mandrel 30 extends in the axial direction by the rolling process,
when the part is moved to the side sandwiched between the pair of
rotating bodies 50B, 50B due to the rotation of the mandrel 40, the
pair of rotating bodies 50B, 50B biases and pushes the workpiece 4B
in the axial direction such that the workpiece 4B regains the
original dimension in the axial direction.
[0136] In addition, as illustrated in FIG. 13, in the present
embodiment, the friction force acting between the end surfaces of
the workpieces 4 and the end surfaces of the protrusions 12 and the
protrusions 22 can be reduced by providing the rotating bodies 50,
so that the forming roll 10 and the support roll 20 are smoothly
rotated, and the energy necessary for rolling processing can be
reduced. Furthermore, damage such as seizure on the workpieces 4,
the protrusions 12, and the protrusions 22 can be prevented.
[0137] In addition, although not illustrated, as another variation
of the present embodiment, as illustrated in FIG. 15A and FIG. 15B,
the number of the workpieces 4 that are rolling-formed at the same
time can be not odd numbers but even numbers. For example, as
illustrated in FIG. 15A, two workpieces 4A and 4B can be
rolling-formed at the same time. Specifically, two disc-shaped
protrusions 22 (22A and 22B) are provided on the support roll 20 at
a predetermined interval in the axial direction.
[0138] On the protrusion 22A, the second engaging groove 23A that
corresponds to the first engaging groove 32 and is engaged with the
outer peripheral surface 4b and one end surface (for example, upper
end surface) in the axial direction of the workpiece 4A is
provided.
[0139] In addition, two disc-shaped protrusions 12 (12A, 12B) are
provided on the forming roll 10 at a predetermined interval in the
axial direction.
[0140] In such a variation, the workpiece 4A is arranged such that
the outer peripheral surface of the second engaging groove 23A is
engaged with the outer peripheral surface 4b of the workpiece 4A,
and an end surface of the second engaging groove 23A in the axial
direction is engaged with one end surface of the workpiece 4A in
the axial direction. Here, the workpiece 4A is arranged to be
sandwiched between the protrusion 12A and the protrusion 12B in the
axial direction to limit the movement in the axial direction. In
addition, on the opposite side in the radial direction from the
side in contact with the outer peripheral surface of the first
engaging groove 32, both end surfaces of the workpiece 4A in the
axial direction are sandwiched between the pair of rotating bodies
50A, 50A provided on the inner surface sides of the protrusions
12A, 12B in the axial direction, which are opposed to each
other.
[0141] In addition, on the side where the inner peripheral surface
4a of the workpiece 4B abuts with the outer peripheral surface of
the first engaging groove 32 of the mandrel 30, the workpiece 4B is
sandwiched by the outer peripheral surface of the protrusion 12B in
the radial direction. In addition, on the opposite side in the
radial direction from the side in contact with the outer peripheral
surface of the first engaging groove 32, both end surfaces of the
workpiece 4B in the axial direction are sandwiched between the pair
of rotating bodies 50B, 50B provided on the inner surface sides of
the protrusions 22A and 22B in the axial direction, which are
opposed to each other.
[0142] In addition, as illustrated in FIG. 15B, four workpieces 4A
to 4D can be rolling-formed at the same time. Specifically, three
disc-shaped protrusions 22 (22A, 22B, and 22C) are provided on the
support roll 20 at predetermined intervals in the axial
direction.
[0143] On the protrusion 22A, the second engaging groove 23A that
corresponds to the first engaging groove 32 and is engaged with the
outer peripheral surface 4b and one end surface in the axial
direction of the workpiece 4A is provided.
[0144] In addition, three disc-shaped protrusions 12 (12A, 12B, and
12C) are provided on the forming roll 10 at predetermined intervals
in the axial direction.
[0145] Here, pairs of rotating bodies 50 (50A to 50D) that bias
both end surfaces of the workpieces 4 in the axial direction are
provided on the forming roll 10 and the support roll 20. The
rotating bodies 50 each have a rotary shaft, and are radially and
rotatably arranged on end surfaces of the protrusions 12 and the
protrusions 22 in the axial direction, which are opposed to one
another in the axial direction. It is to be noted that the rotating
bodies 50 may be arranged on at least one of the forming roll 10
and the support roll 20, and are preferably arranged on the forming
roll 10 and the support roll 20.
[0146] In such a variation, the workpiece 4A is arranged such that
the outer peripheral surface of the second engaging groove 23A is
engaged with the outer peripheral surface 4b of the workpiece 4A,
and an end surface of the second engaging groove 23A in the axial
direction is engaged with one end surface of the workpiece 4A in
the axial direction. Here, the workpiece 4A is arranged to be
sandwiched between the protrusion 12A and the protrusion 12B in the
axial direction to limit the movement in the axial direction. In
addition, on the opposite side in the radial direction from the
side in contact with the outer peripheral surface of the first
engaging groove 32, both end surfaces of the workpiece 4A in the
axial direction are sandwiched between the pair of rotating bodies
50A, 50A provided on the inner surface sides of the protrusions
12A, 12B in the axial direction, which are opposed to each
other.
[0147] In addition, on the side where the inner peripheral surface
4a of the workpiece 4B abuts with the outer peripheral surface of
the first engaging groove 32 of the mandrel 30, the workpiece 4B is
sandwiched by the outer peripheral surface of the protrusion 12B in
the radial direction. In addition, on the opposite side in the
radial direction from the side in contact with the outer peripheral
surface of the first engaging groove 32, both end surfaces of the
workpiece 4B in the axial direction are sandwiched between the pair
of rotating bodies 50B, 50B provided on the inner surface sides of
the protrusions 22A and 22B in the axial direction, which are
opposed to each other.
[0148] In addition, on the side where the inner peripheral surface
4a of the workpiece 4C abuts with the outer peripheral surface of
the first engaging groove 32 of the mandrel 30, the workpiece 4C is
sandwiched by the outer peripheral surface of the protrusion 22B in
the radial direction. In addition, on the opposite side in the
radial direction from the side in contact with the outer peripheral
surface of the first engaging groove 32, both end surfaces of the
workpiece 4C in the axial direction are sandwiched between the pair
of rotating bodies 50C, 50C provided on the inner surface sides of
the protrusions 22A and 22B in the axial direction, which are
opposed to each other.
[0149] In addition, on the side where the inner peripheral surface
4a of the workpiece 4D abuts with the outer peripheral surface of
the first engaging groove 32 of the mandrel 30, the workpiece 4D is
sandwiched by the outer peripheral surface of the protrusion 12C in
the radial direction. In addition, on the opposite side in the
radial direction from the side in contact with the outer peripheral
surface of the first engaging groove 32, both end surfaces of the
workpiece 4D in the axial direction are sandwiched between the pair
of rotating bodies 50D, 50D provided on the inner surface sides of
the protrusions 22B, 22C in the axial direction, which are opposed
to each other.
[0150] Here, when even numbers of the workpieces 4 are
rolling-formed at the same time, in addition to the above-described
variations with reference to FIG. 15A and FIG. 15B, by using a
rolling processing device in which the maximum number of workpieces
that can be stored is odd numbers, processing may be performed with
the number of workpieces decreased by one. For example, by using a
"rolling processing device in which the number of workpieces is
five", four workpieces the number of which is smaller than the five
by one can be rolling-formed at the same time.
[0151] Heretofore, although the rolling processing device and the
rolling processing method according to the present invention have
been described, the rolling processing device and the rolling
processing method according to the present invention are not
limited to the above-described embodiments, and various
modifications can be made without departing from the spirit of the
invention. For example, the first engaging groove is provided on
the mandrel in the above-described embodiments, but if plural
workpieces can be held without the first engaging groove, it is not
necessary to provide the first engaging groove.
[0152] Heretofore, although the present invention has been
described with reference to the specific embodiments, it is not
intended to limit the invention by the description. By referring to
the description of the present invention, various modifications of
the disclosed embodiments and other embodiments of the present
invention are apparent to those skilled in the art. Therefore, it
should be understood that claims cover these modifications or
embodiments included in the scope and sprit of the present
invention.
REFERENCE SIGNS LIST
[0153] 1 rolling processing device [0154] 2 annular member [0155] 4
cylindrical member (workpiece) [0156] 10 support roll [0157] 11
rotary shaft [0158] 12 protrusion [0159] 13 second engaging groove
[0160] 20 forming roll [0161] 21 rotary shaft [0162] 22 protrusion
[0163] 23 second engaging groove [0164] 30 mandrel [0165] 31 rotary
shaft [0166] 32 first engaging groove [0167] 50 rotating body
* * * * *