U.S. patent application number 12/450070 was filed with the patent office on 2010-04-08 for process for manufacturing ring-shaped member.
This patent application is currently assigned to Kanemitsu Corporation. Invention is credited to Naoki Fuji, Toshiaki Kanemitsu, Katsuhiko Nakayama, Kazuyuki Oda.
Application Number | 20100083725 12/450070 |
Document ID | / |
Family ID | 39759072 |
Filed Date | 2010-04-08 |
United States Patent
Application |
20100083725 |
Kind Code |
A1 |
Kanemitsu; Toshiaki ; et
al. |
April 8, 2010 |
PROCESS FOR MANUFACTURING RING-SHAPED MEMBER
Abstract
A method of producing a ring-shaped member is provided in which
a material loss is eliminated, the process cost can be reduced, and
a ring-shaped member can be easily obtained from a pipe member by a
small number of steps. The method includes steps of: inwardly
projectingly shaping a flange portion 1c on an end portion of a
metal-made pipe member 1; and cutting off the flange portion 1c
from the pipe member 1, thereby obtaining a ring-shaped member
10.
Inventors: |
Kanemitsu; Toshiaki; (Hyogo,
JP) ; Nakayama; Katsuhiko; (Hyogo, JP) ; Fuji;
Naoki; (Hyogo, JP) ; Oda; Kazuyuki; (Hyogo,
JP) |
Correspondence
Address: |
BACON & THOMAS, PLLC
625 SLATERS LANE, FOURTH FLOOR
ALEXANDRIA
VA
22314-1176
US
|
Assignee: |
Kanemitsu Corporation
Akashi-shi
JP
|
Family ID: |
39759072 |
Appl. No.: |
12/450070 |
Filed: |
March 12, 2007 |
PCT Filed: |
March 12, 2007 |
PCT NO: |
PCT/JP2007/000203 |
371 Date: |
September 10, 2009 |
Current U.S.
Class: |
72/338 |
Current CPC
Class: |
B21D 53/16 20130101 |
Class at
Publication: |
72/338 |
International
Class: |
B21D 53/16 20060101
B21D053/16 |
Claims
1. A method of producing a ring-shaped member in which a
ring-shaped member is obtained from a metal-made pipe member,
wherein said method includes steps of: inwardly projectingly
shaping a flange portion on an end portion of said pipe member; and
cutting off said flange portion from said pipe member, thereby
obtaining a ring-shaped member.
2. A method of producing a ring-shaped member in which a
ring-shaped member is obtained from a metal-made pipe member,
wherein said method includes steps of: inwardly bending a whole
circumference of an end portion of said pipe member to shape a
tapered truncated conical tubular portion; further inwardly bending
said truncated conical tubular portion to shape a flange portion
which is inwardly projected; and cutting off said flange portion
from said pipe member, thereby obtaining a ring-shaped member.
Description
TECHNICAL FIELD
[0001] The present invention relates to a method of producing a
ring-shaped member in which a ring-shaped member is obtained from a
metal-made pipe member.
BACKGROUND ART
[0002] Conventionally, for example, a ring-shaped member 10 such as
shown in FIG. 2 is produced by a method in which, from a stock
material 20 shown in FIGS. 3(a), (b) and having a predetermined
thickness, a plurality of ring-shaped members 10 are punched out in
a single or plural rows by a pressing apparatus.
[0003] In the conventional production method, however, the yield
which is a ratio of the weight of the ring-shaped members 10 to
that of the stock material 20 is poor, and hence the cost of the
ring-shaped member 10 is increased. The reason is that the ratio of
a skeleton S1 and a slug S2 to the ring-shaped member 10 is high in
the material utilization. The term "skeleton" means a frame-like
scrap which remains as a result of punching of the plurality of
ring-shaped members 10. The term "slug" means a plurality of scraps
which are removed by a punch in the process of punching out the
plurality of ring-shaped members 10.
[0004] Therefore, a method of producing a ring-shaped member shown
in FIG. 4 has been proposed (for example, see Patent Literature 1).
The method of shaping a ring-shaped member is configured by steps
of: longitudinally forming a slit 22 in the middle of a rectangular
steel plate 21; pressingly expanding the slit 22 to obtain a
polygonal member 23; and shaping angled portions 23a and side
portions 23b of the polygonal member 23 into an arcuate shape which
is circumferentially smooth, to obtain a ring-shaped member 10.
[0005] According to the method of producing a ring-shaped member,
the shaping is performed by pressingly expanding the slit 22 of the
rectangular steel plate 21. Therefore, the skeleton S1 and the slug
S2 such as shown in FIG. 3 are not produced, a material loss can be
reduced, and the process cost of the ring-shaped member 10 can be
lowered.
Patent Literature 1: Japanese Patent Application Laying-Open No.
2004-188548
DISCLOSURE OF THE INVENTION
Problems to be Solved by the Invention
[0006] In the method of producing a ring-shaped member disclosed in
Patent Literature 1, in order to obtain a ring-shaped member from a
steel plate member serving as a stock material, however, a step of
cutting the steel plate member into a rectangular shape to obtain
the rectangular steel plate 21 is necessary, and then many further
steps such as steps of: forming the slit 22 in the middle of the
rectangular steel plate 21 by gas, plasma, or laser; pressingly
expanding the slit 22 by an apparatus consisting of male and female
dies and a shaping die to obtain the polygonal member 23; and, by
the shaping die, shaping the angled portions 23a and side portions
23b of the polygonal member 23 into an arcuate shape which is
circumferentially smooth are required. The steps are
complicated.
[0007] The invention has been conducted in order to solve the
problems. It is an object of the invention to provide a method of
producing a ring-shaped member in which a material loss is
eliminated, the process cost can be reduced, and ring-shaped
members can be easily continuously obtained from a pipe member by a
small number of steps.
Means for Solving the Problems
[0008] The invention according to claim 1 provides a method of
producing a ring-shaped member in which a ring-shaped member is
obtained from a metal-made pipe member, wherein the method includes
steps of: inwardly projectingly shaping a flange portion on an end
portion of the pipe member; and cutting off the flange portion from
the pipe member, thereby obtaining a ring-shaped member.
[0009] According to the configuration, the flange portion is
inwardly projectingly shaped on an end portion of the pipe member,
and the flange portion is cut off from the pipe member to obtain
the ring-shaped member. Therefore, the skeleton S1 and the slug S2
such as shown in FIG. 3 are not produced, a material loss can be
eliminated, and the process cost of the ring-shaped member can be
lowered.
[0010] Furthermore, ring-shaped members can be easily continuously
obtained from the pipe member by the small number of steps, or
namely, the step of inwardly projectingly shaping a flange portion
on an end portion of the pipe member, and that of cutting off the
flange portion from the pipe member.
[0011] The invention according to claim 2 provides a method of
producing a ring-shaped member in which a ring-shaped member is
obtained from a metal-made pipe member, wherein the method includes
steps of: inwardly bending a whole circumference of an end portion
of the pipe member to shape a tapered truncated conical tubular
portion; further inwardly bending the truncated conical tubular
portion to shape a flange portion which is inwardly projected; and
cutting off the flange portion from the pipe member, thereby
obtaining a ring-shaped member.
[0012] According to the configuration, in a similar manner as the
invention set forth in claim 1, the skeleton S1 and the slug S2
such as shown in FIG. 3 are not produced, a material loss can be
reduced, the process cost of the ring-shaped member can be lowered,
and ring-shaped members can be easily continuously obtained from
the pipe member. Moreover, the truncated conical tubular portion is
shaped before the shaping of the inward flange portion on an end
portion of the pipe member. Even when the pipe member is thick,
therefore, the flange portion can be shaped in a thickness which is
uniform as far as possible, while avoiding local thinning, as
compared with the case where a perpendicular flange is directly
shaped on an end portion of a pipe member.
EFFECTS OF THE INVENTION
[0013] The invention has advantages that ring-shaped members can be
easily continuously obtained from a pipe member while eliminating a
material loss, and by the small number of steps, and that the
process cost of a ring-shaped member can be lowered.
BRIEF DESCRIPTION OF THE DRAWINGS
[0014] FIG. 1 is a step section view of a method of producing a
ring-shaped member showing an embodiment of the invention.
[0015] FIG. 2 is a plan view showing an example of a ring-shaped
member.
[0016] FIG. 3 is a plan view showing a conventional step of
punching out blanks from a stock material, (a) shows single-row
punching, and (b) shows parallel punching.
[0017] FIG. 4 is a step diagram of a method of producing a
ring-shaped member disclosed in Patent Literature 1.
DESCRIPTION OF REFERENCE NUMERALS
[0018] 1 pipe member [0019] 1a end portion [0020] 1b truncated
conical tubular portion [0021] 1c flange portion [0022] 10
ring-shaped member
BEST MODE FOR CARRYING OUT THE INVENTION
[0023] Hereinafter, a preferred embodiment of the method of
producing a ring-shaped member related to the invention will be
described with reference to the drawings.
[0024] FIG. 1 is a step section view of a method of producing a
ring-shaped member showing an embodiment of the invention.
[0025] As shown in FIG. 1(a), first, a pipe member 1 having a
circular section made of a metal such as soft steel, copper,
aluminum, iron, or stainless steel is set in a press processing
apparatus 2. The press processing apparatus 2 includes: a punch 3
which is to be passed through the pipe member 1; a punch outer 4; a
first die 5; and a first center pin 6. The first die 5 has a die
hole 7 which is opposed to the tip end of the punch 3, and which
has a dish-like section shape that is outward expanded. A tip end
portion 6a of the first center pin 6 having an outer diameter which
is smaller than the inner diameter of the pipe member 1 is
protruded into the die hole 7.
[0026] The pipe member 1 is set so that its end portion 1a is
protruded by a predetermined distance from a tip end portion of the
punch 3.
[0027] As shown in (b) of the figure, next, the punch 3 and the
first die 5 are relatively moved so as to approach each other, and
the end portion 1a of the pipe member 1 is caused to enter between
the tapered inner circumference of the die hole 7 having a
dish-like section shape, and the outer circumference of a protruded
tip end portion 6a of the center pin 6, whereby the whole
circumference of the end portion 1a of the pipe member 1 is
inwardly bent to shape a tapered truncated conical tubular portion
1b (namely, a truncated conical tubular portion shaping step).
[0028] As shown in (c) of the figure, then, at a processing
position which includes: a second die 8; a first ejector 9 that is
passed through a die hole 8a of the die 8, and that has a
substantially same diameter as the inner diameter (the outer
diameter of the punch 3) of the pipe member 1; and a second center
pin 11 that is passed through a center hole 9a of the ejector 9,
and that has a substantially same diameter as the inner diameter of
a ring-shaped member 10 (see FIG. 2), and in which a tip end
portion 11a of the second center pin 11 is protruded from the tip
end of the first ejector 9, the second die 8, the first ejector 9,
and the second center pin 11 and the punch 3 are relatively moved
so as to approach each other, and the tip end of the first ejector
9 is pressed against the truncated conical tubular portion 1b,
whereby the truncated conical tubular portion 1b is bent until it
is substantially perpendicular to the axis of the pipe member 1 to
shape a flange portion is which is inwardly projected (namely, a
flange portion shaping step).
[0029] As shown in (d) of the figure, finally, at a processing
position which includes: a third die 12; and a second ejector 13
that is passed through a die hole 12a of the die, and that has a
substantially same diameter as the inner diameter (the outer
diameter of the punch 3) of the pipe member 1, the third die 12,
and the second ejector 13 and the punch 3 are relatively moved so
as to approach each other, so that the flange portion 1c is pressed
against the tip end of the punch 3 by the second ejector 13. The
third die 12 is relatively moved so as to further approach the
punch 3, so that a shearing force acts between the die 12 and the
punch 3, and the punch 3 and the edge of the die 12 bites in a base
portion of the flange portion 1c to shear it, whereby the flange
portion is cut off from the pipe member 1, and the ring-shaped
member 10 (see FIG. 2) can be obtained (namely, a flange portion
cutting off step).
[0030] When the truncated conical tubular portion shaping step
(FIG. 1(b)), the flange portion shaping step (FIG. 1(c)), and the
flange portion cutting off step (FIG. 1(d)) are sequentially
repeated, it is possible to continuously produce ring-shaped
members 10.
[0031] According to the production method of the embodiment,
without producing the skeleton S1 and the slug S2 such as shown in
FIG. 3, and without forming a material loss, many ring-shaped
members 10 can be continuously produced from one pipe member 1 by
the pressing process. Furthermore, the ring-shaped member 10 can be
easily obtained from the pipe member 1 by the small number of
steps, or namely, the step of projectingly shaping the flange
portion 1c on the end portion of the pipe member 1, and that of
cutting off the flange portion 1c from the pipe member 1.
Therefore, the process cost of the ring-shaped member 10 can be
lowered.
[0032] In the embodiment, the truncated conical tubular portion
shaping step (FIG. 1(b)) is performed to shape the truncated
conical tubular portion 1b, before the shaping of the flange
portion 1c on the end portion of the pipe member 1. However, the
truncated conical tubular portion shaping step is not always
necessary. Without performing the truncated conical tubular portion
shaping step, the flange portion is may be inwardly projectingly
shaped on the end portion of the pipe member 1.
[0033] In the process of inwardly projectingly shaping the flange
portion is on the end portion of the pipe member 1, it is not
restricted to employ the press processing apparatus 2 as in the
embodiment. The flange portion 1c may be shaped by another flange
processing apparatus.
* * * * *