U.S. patent application number 16/069043 was filed with the patent office on 2019-01-24 for working method for workpiece and polishing machine brush and tool holder used therefor.
This patent application is currently assigned to XEBEC TECHNOLOGY CO., LTD.. The applicant listed for this patent is TAIMEI CHEMICALS CO., LTD., XEBEC TECHNOLOGY CO., LTD.. Invention is credited to Suguru MATSUSHITA, Koji SATO, Youichi SATO.
Application Number | 20190022818 16/069043 |
Document ID | / |
Family ID | 59361711 |
Filed Date | 2019-01-24 |
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United States Patent
Application |
20190022818 |
Kind Code |
A1 |
SATO; Youichi ; et
al. |
January 24, 2019 |
WORKING METHOD FOR WORKPIECE AND POLISHING MACHINE BRUSH AND TOOL
HOLDER USED THEREFOR
Abstract
An object is to provide a working method capable of efficiently
deburring and polishing a workpiece and making the life of a brush
in use long in a machine tool not having power to directly rotate a
tool and capable of working the workpiece by bringing the tool and
the workpiece in contact with each other while causing the tool and
the workpiece to perform a relative motion. The present invention
relates to a working method of working a workpiece by rotating a
brush-like grinding wheel by causing a brush-like grinding wheel
and a workpiece to perform a relative motion while bringing the
brush-like grinding wheel and the workpiece in contact with each
other in a machine tool not having power to rotate a tool.
Inventors: |
SATO; Youichi; (Tokyo,
JP) ; SATO; Koji; (Tokyo, JP) ; MATSUSHITA;
Suguru; (Nagano, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
XEBEC TECHNOLOGY CO., LTD.
TAIMEI CHEMICALS CO., LTD. |
Tokyo
Nagano |
|
JP
JP |
|
|
Assignee: |
XEBEC TECHNOLOGY CO., LTD.
Tokyo
JP
TAIMEI CHEMICALS CO., LTD.
Nagano
JP
|
Family ID: |
59361711 |
Appl. No.: |
16/069043 |
Filed: |
January 18, 2016 |
PCT Filed: |
January 18, 2016 |
PCT NO: |
PCT/JP2016/051310 |
371 Date: |
July 10, 2018 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B24B 7/20 20130101; B24B
29/00 20130101; B24B 41/047 20130101; B24D 13/145 20130101; B24B
9/00 20130101; B24B 29/005 20130101; B24B 7/16 20130101 |
International
Class: |
B24B 29/00 20060101
B24B029/00 |
Claims
1. A working method for a workpiece, the working method comprising:
rotating a brush-like grinding wheel by causing the brush-like
grinding wheel and the workpiece to perform a relative motion while
bringing the brush-like grinding wheel and the workpiece in contact
with each other in a machine tool not having power to rotate a
tool.
2. The working method according to claim 1, wherein a portion to
which a driving force is transmitted by coming in contact with the
workpiece and a portion where a deburring function occurs by coming
in contact with an edge portion of the workpiece are different on a
tip end surface of the brush-like grinding wheel.
3. The working method according to claim 1, wherein the relative
motion is a motion of the workpiece.
4. The working method according to claim 3, wherein the motion of
the workpiece is a rotary motion.
5. The working method according to claim 4, comprising: rotating
the brush-like grinding wheel in the same direction as a rotating
direction of the workpiece by bringing the brush-like grinding
wheel in contact with the workpiece from an end surface of the
workpiece, the end surface being orthogonal to an axis of rotation
of the workpiece.
6. The working method according to claim 4, comprising: rotating
the brush-like grinding wheel in an opposite direction to a
rotating direction of the workpiece by bringing the brush-like
grinding wheel in contact with the workpiece from an end surface of
the workpiece, the end surface being orthogonal to an axis of
rotation of the workpiece.
7. The working method according to claim 4, comprising: bringing
the brush-like grinding wheel in contact with the workpiece such
that a contact surface of the brush-like grinding wheel with the
workpiece becomes asymmetrical to an axis of symmetry, in a case
where a straight line passing through a rotation center on the tip
end surface of the brush-like grinding wheel and parallel to a
direction of a force received by the brush-like grinding wheel from
the workpiece is defined as the axis of symmetry.
8. The working method according to claim 3, wherein the motion of
the workpiece is a linear motion.
9. The working method according to claim 1, wherein the relative
motion is an orbital motion of the brush-like grinding wheel.
10. The working method according to claim 1, wherein the relative
motion is a linear motion of the brush-like grinding wheel.
11. A polishing machine brush comprising: a brush-like grinding
wheel including linear grinding materials and a holder that holds
the linear grinding materials; a grasping member that grasps the
brush-like grinding wheel in a rotatable state by supporting a rear
end side of the holder; and a fixing jig connected with the
grasping member and used for fixing the grasping member to a
machine tool.
12. A tool holder comprising: a grasping member that grasps a tool
in a rotatable state; and a fixing jig for fixing the grasping
member to a machine tool, wherein the fixing jig includes an axial
position adjustment member and a fixed member to be fixed to the
machine tool, and the grasping member is connected with the axial
position adjustment member, the axial position adjustment member is
connected with the fixed member via a connection member, the axial
position adjustment member is rotatable about the connection member
as an axis, and a position of an axis of rotation of a tool in
contact with a workpiece is adjustable by the axial position
adjustment member.
Description
TECHNICAL FIELD
[0001] The present invention relates to a working method for a
workpiece, the working method including deburring and polishing the
workpiece while rotating a brush-like grinding wheel, using a force
generated by a relative motion of the brush-like grinding wheel and
the workpiece as a driving force, and a polishing machine brush and
a tool holder used for the working method.
BACKGROUND ART
[0002] A carrier is known as one of power transmission mechanisms
in machine tools such as lathes and grinders (for example, Patent
Literature 1). This is intended to transmit a driving force of a
rotating object to an object to be rotated by connecting and fixing
the rotating object and the object to be rotated by the
carrier.
[0003] A lathe is a machine tool that cuts, polishes, and deburrs
the workpiece (hereinafter may also be referred to as "work") by
bringing the tool in contact with the workpiece while rotating the
workpiece. In lathe working, the tool is fixed to a tool grasping
member and is not rotated. For this reason, a rotary-bite is known
as a technique of rotating a tool to prevent the tool from melting
due to frictional heat (for example, Patent Literature 2). This is
a technique of rotating the tool by transmitting a rotational
driving force of the workpiece to the tool by frictional
resistance, thereby releasing heat of the tool.
CITATION LIST
Patent Literature
[0004] Patent Literature 1: JP 2009-274166 A [0005] Patent
Literature 2: JP H10-315010 A
SUMMARY OF INVENTION
Technical Problem
[0006] In typical lathe working by NC control, a tool provided a
cutting bite is brought in contact with a workpiece while moving
the position of the tool in a state where the workpiece is rotated
at a fixed position, thereby cutting the workpiece into a
predetermined shape. In a deburring process after the lathe
working, it is conceivable to perform the deburring by NC
controlling a tool provided a polishing brush for deburring in
place of the cutting tool and to bring the polishing brush in
contact with the workpiece while rotating the workpiece. However,
there has been a problem, in a machine tool such as a lathe not
having power to rotate a tool, in the case of bringing a brush in
contact with a rotating workpiece, the same portion of the brush
remains in contact with the workpiece, and thus deburring and
polishing effects cannot be sufficiently obtained. In addition,
there has been a problem that only a part of the brush is extremely
worn and the life of the brush becomes short.
[0007] The present invention has been made in view of the above
problems. That is, an object of the present invention is to provide
a working method capable of efficiently deburring and polishing a
workpiece, and making the life of an in-use brush long, in a
machine tool not having power to directly rotate a tool and capable
of working the workpiece by bringing the tool and the workpiece in
contact with each other while causing the tool and the workpiece to
perform a relative motion.
Solution to Problem
[0008] The present invention relates to a working method for a
workpiece, the working method comprising: rotating a brush-like
grinding wheel by causing the brush-like grinding wheel and the
workpiece to perform a relative motion while bringing the
brush-like grinding wheel and the workpiece in contact with each
other in a machine tool not having power to rotate a tool.
[0009] The present invention further preferable that a portion to
which a driving force is transmitted by coming in contact with the
workpiece and a portion where a deburring function occurs by coming
in contact with an edge portion of the workpiece are different on a
tip end surface of the brush-like grinding wheel.
[0010] The present invention further preferable that the relative
motion is a motion of the workpiece.
[0011] The present invention further preferable that the motion of
the workpiece is a rotary motion.
[0012] The present invention further preferable that rotating the
brush-like grinding wheel in the same direction as a rotating
direction of the workpiece by bringing the brush-like grinding
wheel in contact with the workpiece from an end surface of the
workpiece, the end surface being orthogonal to an axis of rotation
of the workpiece.
[0013] The present invention further preferable that rotating the
brush-like grinding wheel in an opposite direction to a rotating
direction of the workpiece by bringing the brush-like grinding
wheel in contact with the workpiece from an end surface of the
workpiece, the end surface being orthogonal to an axis of rotation
of the workpiece.
[0014] The present invention further preferable that bringing the
brush-like grinding wheel in contact with the workpiece such that a
contact surface of the brush-like grinding wheel with the workpiece
becomes asymmetrical to an axis of symmetry, in a case where a
straight line passing through a rotation center on the tip end
surface of the brush-like grinding wheel and parallel to a
direction of a force received by the brush-like grinding wheel from
the workpiece is defined as the axis of symmetry.
[0015] The present invention further preferable that the motion of
the workpiece is a linear motion.
[0016] The present invention further preferable that the relative
motion is an orbital motion of the brush-like grinding wheel.
[0017] The present invention further preferable that the relative
motion is a linear motion of the brush-like grinding wheel.
[0018] The present invention relates to a polishing machine brush
comprising: a brush-like grinding wheel including linear grinding
materials and a holder that holds the linear grinding materials; a
grasping member that grasps the brush-like grinding wheel in a
rotatable state by supporting a rear end side of the holder; and a
fixing jig connected with the grasping member and used for fixing
the grasping member to a machine tool.
[0019] The present invention relates to a tool holder comprising: a
grasping member that grasps a tool in a rotatable state; and a
fixing jig for fixing the grasping member to a machine tool,
wherein the fixing jig includes an axial position adjustment member
and a fixed member to be fixed to the machine tool, and the
grasping member is connected with the axial position adjustment
member, the axial position adjustment member is connected with the
fixed member via a connection part, the axial position adjustment
member is rotatable about the connection part as an axis, and a
position of an axis of rotation of a tool in contact with a
workpiece is adjustable by the axial position adjustment
member.
Advantageous Effects of Invention
[0020] According to the working method of the present invention, a
workpiece is worked while rotating a brush-like grinding wheel,
using a force generated by a relative motion of the workpiece and
the brush-like grinding wheel as a driving force, whereby a contact
point between the brush-like grinding wheel and the workpiece is
not fixed, and deburring and polishing effects can be sufficiently
obtained. Further, it can be prevented that only a part of a brush
is extremely worn, and the life of the brush can be elongated.
BRIEF DESCRIPTION OF DRAWINGS
[0021] FIG. 1 is a perspective view of a polishing machine brush
according to an embodiment of the present invention.
[0022] FIGS. 2(a) and 2(b) are respectively a side view of the
polishing machine brush and a view when the polishing machine brush
is viewed from an opening side of a holder, according to the
embodiment of the present invention.
[0023] FIG. 3 is a sectional view illustrating a state in which
FIG. 2(b) is cut along a line segment X-X.
[0024] FIG. 4 is a perspective view of a polishing machine brush
according to an embodiment of the present invention.
[0025] FIG. 5 is a perspective view of a case in which the
polishing machine brush is viewed from a back side, according to
the embodiment of the present invention.
[0026] FIG. 6 is a schematic view illustrating a force that a
brush-like grinding wheel 1 received from a workpiece 20.
[0027] FIG. 7 is a schematic view illustrating a cutting
amount.
[0028] FIG. 8 is a schematic view illustrating a portion where a
deburring function occurs and a portion to which a driving force is
transmitted from the workpiece, in the brush-like grinding wheel
1.
[0029] FIG. 9 is a schematic view illustrating distribution of
magnitude of a force to rotate the brush-like grinding wheel 1 in
the same direction as a rotating direction of the workpiece 20, and
magnitude of a force to rotate the brush-like grinding wheel 1 in
an opposite direction to the rotating direction of the workpiece
20.
[0030] FIG. 10 is a schematic view illustrating an example of a
working method for a workpiece according to the embodiment of the
present invention.
[0031] FIG. 11 is a schematic view illustrating an example of the
working method for a workpiece according to the embodiment of the
present invention.
[0032] FIG. 12 is a schematic view illustrating an example of the
working method for a workpiece according to the embodiment of the
present invention.
[0033] FIG. 13 is a schematic view illustrating an example of a
working method for a workpiece according to an embodiment of the
present invention.
[0034] FIG. 14 is a schematic view illustrating an example of a
working method for the workpiece in a brush-like grinding wheel
1.
[0035] FIG. 15 is a schematic view illustrating an example of a
working method for a workpiece according to an embodiment of the
present invention.
[0036] FIGS. 16(a) and 16(b) are schematic views illustrating an
example of a working method for a workpiece according to an
embodiment of the present invention.
[0037] FIG. 17 is a schematic view illustrating an example of a
working method for a workpiece according to an embodiment of the
present invention.
DESCRIPTION OF EMBODIMENTS
[0038] Hereinafter, embodiments of the present invention will be
described with reference to the drawings, but embodiments are not
limited to the following embodiments unless contrary to the gist of
the present invention. Note that, in the following embodiments,
common elements are denoted by the same reference numerals, and
redundant description is omitted as appropriate.
(Polishing Machine Brush)
[0039] FIG. 1 is a perspective view of a polishing machine brush
according to an embodiment of the present invention. FIG. 2(a) is a
side view of the polishing machine brush and is a view illustrating
an internal structure of a grasping member, according to the
embodiment of the present invention. FIG. 2(b) is a view of the
polishing machine brush according to the embodiment of the present
invention is viewed from a back side of a holder. FIG. 3 is a
sectional view illustrating a state in which FIG. 2(b) is cut along
a line segment X-X. In the present embodiment, a polishing machine
brush 12 is composed of a brush-like grinding wheel 1, a grasping
member 7, and a fixing jig 8. The brush-like grinding wheel 1
includes linear grinding materials 2, a holder 3, and a grasped
member 6. The fixing jig 8 includes an axial position adjustment
member 9 and a fixed member 10.
[0040] The brush-like grinding wheel 1 has a structure in which a
base end side of a plurality of the linear grinding materials 2 is
held by the cylindrical holder 3. The linear grinding materials 2
are not particularly limited as long as the materials are capable
of polishing a workpiece, that is, the materials have higher
hardness and brittleness than the workpiece, and can be
appropriately selected according to the workpiece, a purpose of
working, or the like. Specifically, an example of the linear
grinding materials 2 includes materials obtained by impregnating an
aggregate yarn in which long fiber such as long alumina fiber, long
glass fiber, long silicon carbide fiber, or long boron fiber is
aggregated with a binder resin such as a silicone resin, an
urethane resin, an epoxy resin, a phenol resin, a polyimide resin,
or an unsaturated polyester resin, and curing the binder resin. As
the long fiber forming the aggregate yarn, the long alumina fiber
or the long silicon carbide fiber is favorable in the case of
polishing an iron-based metal and a non-ferrous metal because the
aforementioned fiber is excellent in abrasiveness to the metals.
Note that the aggregate yarn may be formed using two or more kinds
of the long fiber.
[0041] One end of the cylindrical holder 3 in an axial direction is
open. As illustrated in FIG. 3, an insertion hole 4 is provided in
an end portion on an opposite side of the opening side of the
holder 3, the insertion hole 4 being for allowing the base end side
of the linear grinding materials 2 to be inserted into the holder
3. The linear grinding materials 2 are held by the holder 3 as the
base end side is inserted into the insertion hole 4 and is fixed
with an adhesive.
[0042] A spindle 5 is provided inside the holder 3 to extend along
an axis of rotation from the end portion on the opposite side of
the opening side. As illustrated in FIG. 2(b), in the case where
the brush-like grinding wheel 1 of the present embodiment is viewed
from the opening side of the holder 3, the plurality of linear
grinding materials 2 is circumferentially provided about the
spindle 5 along an inner wall of the holder 3 at fixed intervals.
The brush-like grinding wheel 1 of the present embodiment is
provided with a certain space among the plurality of linear
grinding materials 2, thereby to efficiently discharge chips and
also to have an excellent heat dissipation effect. Therefore,
deburring and polishing can be performed with high efficiency and
with high accuracy.
[0043] Further, in the case of bringing the linear grinding
materials 2 in contact with the workpiece 20, escape of the linear
grinding materials 2 in an inner wall-side direction of the holder
3 and in a spindle 5-side direction is restricted by the inner wall
of the holder 3 and the spindle 5. Therefore, a difference in
flexural rigidity less easily occurs between the inner wall side of
the holder 3 and the spindle 5 side in the linear grinding
materials 2. As a result, a difference in the degree of abrasion
less easily occurs between the inner wall side of the holder 3 and
the spindle 5 side in the linear grinding materials 2, and the
accuracy of deburring and polishing work tends to improve.
[0044] A fitting groove is provided in an approximate central
portion in the holder 3 when the end portion on the opposite side
of the opening side in the holder 3 is viewed from the axial
direction, and one end of the grasped member 6 is fit in the
fitting groove. A female screw groove is provided in an end portion
of the grasped member 6 on an opposite side of the fit portion with
the holder 3. The grasping member 7 rotatably grasps the brush-like
grinding wheel 1 as the grasped member 6 is inserted into a shaft
insertion hole provided in the grasping member 7 and the female
screw groove in the grasped member 6 is screwed with a bolt. Note
that, in the present embodiment, the grasped member 6 and the
holder 3 are attachably and detachably formed. However, for
example, the grasped member 6 and the holder 3 may be integrally
provided.
[0045] The grasping member 7 is not particularly limited as long as
the grasping member 7 can rotatably grasp the brush-like grinding
wheel 1. To suppress wear and heat generation of the grasping
member 7, the grasping member 7 preferably includes a bearing. For
example, a ball bearing, a roller bearing, a tapered roller
bearing, a needle bearing, or the like can be used. From the
viewpoint that rolling resistance is small, which is suitable for
high-speed rotation, the ball bearing is favorable. Note that, in
the present embodiment, the ball bearing is used as the grasping
member 7. A plurality of bearings is preferably provided with
respect to a shaft.
[0046] As described above, the brush-like grinding wheel 1 is
rotatably grasped by the grasping member 7. Therefore, in the case
of causing the brush-like grinding wheel 1 and the workpiece 20 in
contact with each other while causing the brush-like grinding wheel
1 and the workpiece 20 to perform a relative motion, the brush-like
grinding wheel 1 can be rotated using a force generated in a
contact surface in the brush-like grinding wheel 1 with the
workpiece 20 as a driving force. For example, in the case of
bringing the brush-like grinding wheel 1 in contact with the
workpiece 20 that performs a motion such as rotation, the
brush-like grinding wheel 1 can be rotated using kinetic energy of
the workpiece as the driving force. Therefore, in the case of using
the polishing machine brush 12 of the present embodiment as a tool
such as a lathe, the brush-like grinding wheel 1 comes in contact
with the workpiece while being rotated by the kinetic energy of the
workpiece. As a result, a contact point of the brush-like grinding
wheel 1 with the workpiece is not fixed, and the deburring and
polishing effects can be sufficiently obtained. Further, when the
brush-like grinding wheel 1 comes in contact with the rotated
workpiece, slippage occurs at the contact point, and in the case
where the brush-like grinding wheel is rotated, a rotation ratio of
the brush-like grinding wheel and the workpiece does not become
1:1. Therefore, an excellent brush effect can be obtained.
[0047] The grasping member 7 is provided with two screw holes in
point symmetrical positions around the shaft insertion hole in the
grasping member 7, and is connected with the axial position
adjustment member 9 with screws. The axial position adjustment
member 9 is connected with the fixed member 10, and can be rotated
about a connection part as an axis. By moving the axial position
adjustment member 9, a contact portion of the linear grinding
materials 2 and the workpiece can be easily adjusted. An excellent
polishing effect can be obtained by appropriately adjusting the
contact portion of the linear grinding materials 2 and the
workpiece according to types of the linear grinding materials and
the workpiece, a purpose of working, and the like.
[0048] The fixed member 10 is fixed with a tool holding member 21
of the machine tool. In the present embodiment, the fixed member 10
is formed in an approximately rectangular parallelepiped shape.
However, the shape of the fixed member 10 is not particularly
limited as long as the fixed member 10 can be fixed with a tool
holder of the machine tool.
[0049] FIG. 4 is a perspective view of a polishing machine brush
according to another embodiment of the present invention, which is
different from the polishing machine brush according to the
above-described embodiment of the present invention. FIG. 5 is a
perspective view of a case in which the polishing machine brush
illustrated in FIG. 4 is viewed from a back side. The polishing
machine brush according to the present embodiment does not include
an axial position adjustment member, and a grasping member 7 is
connected with a fixing jig 8. The fixing jig 8 includes a fixed
member, and the fixed member is fixed by a tool holding member of a
machine tool. Adjustment of a contact portion of linear grinding
materials 2 and a workpiece is performed by adjusting a position at
which the fixing jig 8 is fixed to the tool holding member of the
machine tool and by moving the tool holding member of the machine
tool. A brush-like grinding wheel 1 is rotatably grasped by the
grasping member 7. Therefore, in the case of causing the brush-like
grinding wheel 1 and a workpiece 20 in contact with each other
while causing the brush-like grinding wheel 1 and the workpiece 20
to perform a relative motion, the brush-like grinding wheel 1 can
be rotated using a force generated in a contact surface in the
brush-like grinding wheel 1 with the workpiece 20 as a driving
force. For example, in the case of bringing the brush-like grinding
wheel 1 in contact with the workpiece that performs a motion such
as rotation, the brush-like grinding wheel 1 can be rotated using
kinetic energy of the workpiece as the driving force.
(Tool Holder)
[0050] A tool holder 11 according to an embodiment of the present
invention is a part that constitutes the polishing machine brush 12
illustrated in FIG. 1, and includes the grasping member 7 and the
fixing jig 8 composed of the axial position adjustment member 9 and
the fixed member 10. Constitutions, functions, and the like of the
portions are as described in the polishing machine brush.
[0051] Note that, in the present embodiment, the tool holder 11
grasps the polishing machine brush. However, when performing
cutting work, the tool holder 11 grasps a tool such as a bite in
place of the polishing machine brush.
(Working Method)
First Embodiment
[0052] A first embodiment according to a working method of the
present invention is a method of working a workpiece while causing
the workpiece to perform a rotary motion, using a polishing machine
brush 12 as a polishing tool in a machine tool such as a lathe not
having power to rotate a tool. A brush-like grinding wheel 1 is
brought in contact with an end surface of a workpiece 20 from a
direction along an axis of rotation of the workpiece 20, whereby
the brush-like grinding wheel 1 is rotated by a rotating force of
the workpiece 20 and works the workpiece 20. Since the brush-like
grinding wheel 1 comes in contact with the workpiece 20 while being
rotated, a contact point in the brush-like grinding wheel 1 with
the workpiece 20 is not fixed. Therefore, deburring and polishing
effects can be sufficiently obtained, and extreme wear of only a
part of the brush-like grinding wheel 1 can be prevented and the
life of the brush-like grinding wheel 1 can be elongated.
[0053] Since the deburring and polishing effects are exhibited as
the brush-like grinding wheel is rotated in reaction to rotation of
the workpiece 20, it is desirable to adjust a cutting amount and a
rotational speed of the workpiece so that the brush-like grinding
wheel is rotated. The rotational speed of the workpiece 20 is not
particularly limited. However, the rotational speed is preferably
50 rpm or more, and more preferably 1000 rpm or more.
[0054] FIG. 6 is a schematic view illustrating a force received by
the brush-like grinding wheel 1 from the workpiece 20 when the
brush-like grinding wheel 1 is brought in contact with an end
surface 20a of the workpiece 20, the end surface 20a being
orthogonal to the axis of rotation of the workpiece 20. Both the
workpiece 20 and the brush-like grinding wheel 1 have a diameter of
20 mm, and the length of a line segment connecting respective
rotation centers of the workpiece 20 and the brush-like grinding
wheel 1 is 10 mm. Further, a lap percentage is 100%. In the present
specification, the term "lap percentage" means a value obtained by
dividing a length of an overlapping portion between the workpiece
and the brush-like grinding wheel on a straight line including the
rotation center of the workpiece and the rotation center of the
brush-like grinding wheel by a radius of the workpiece.
[0055] In FIG. 6, the workpiece 20 is clockwisely rotated, and at a
point P1, the brush-like grinding wheel 1 receives a force F1 from
the workpiece 20 in a tangential direction of the end surface of
the workpiece 20. When the force F1 is decomposed in the tangential
direction and in a normal direction of an outer periphery of the
brush-like grinding wheel 1, a force in the tangential direction
can be expressed as a force Ft1 and a force in the normal direction
can be expressed as a force Fn1. Similarly, at a point P2, the
brush-like grinding wheel 1 receives a force F2 from the workpiece
20. When the force F2 is decomposed in the tangential direction and
in the normal direction of the brush-like grinding wheel 1, a force
in the tangential direction can be expressed as a force Ft2 and a
force in the normal direction can be expressed as a force Fn2. At a
point P0 that is the rotation center of the workpiece 20, the force
received by the brush-like grinding wheel 1 from the workpiece is
zero.
[0056] For example, at the point P2, a resistance force Fr
generated when the brush-like grinding wheel 1 runs over the
workpiece 20 acts on the brush-like grinding wheel 1 in a direction
opposite to the force Ft2. In the case where the force Ft2 in the
tangential direction that the brush-like grinding wheel 1 receives
from the workpiece 20 exceeds the resistance force Fr at point P2,
that is, in the case of Ft2>Fr, when the brush-like grinding
wheel 1 is brought in contact with the rotated workpiece 20, a
force acts to rotate the brush-like grinding wheel 1 at the point
P2. On the other hand, when the force Ft2 in the tangential
direction that the brush-like grinding wheel 1 receives from the
workpiece 20 falls below the resistance force Fr at the point P2,
that is, in the case of Ft2<Fr, the force to rotate the
brush-like grinding wheel 1 does not act at the point P2.
[0057] Here, the relationship between the force F that a brush-like
grinding wheel 1 received from a workpiece 20 and the resistance
force Fr generated when the brush-like grinding wheel 1 runs over
the workpiece 20 at the point P2 has been described. However, the
force F that a brush-like grinding wheel 1 received from a
workpiece 20 and the resistance force Fr generated when the
brush-like grinding wheel 1 runs over the workpiece 20 are
generated on the entire contact surface of the workpiece 20 and the
brush-like grinding wheel 1. Whether the brush-like grinding wheel
1 is rotated or not rotated is determined according to whether
which of a total sum .SIGMA.Ft of the forces Ft in the tangential
direction that a brush-like grinding wheel 1 received from a
workpiece 20 on the contact surface of the workpiece 20 and the
brush-like grinding wheel 1, and a total sum .SIGMA.Fr of the
resistance forces Fr generated on the contact surface of the
workpiece 20 and the brush-like grinding wheel 1 becomes larger.
The brush-like grinding wheel 1 is rotated when the total sum
.SIGMA.Ft of the forces Ft in the tangential direction becomes
larger than the total sum .SIGMA.Fr of the resistance forces Fr,
and the brush-like grinding wheel 1 is not rotated when the total
sum .SIGMA.Ft of the forces Ft in the tangential direction becomes
smaller than the total sum .SIGMA.Fr of the resistance forces
Fr.
[0058] The resistance force Fr generated when the brush-like
grinding wheel 1 runs over the workpiece 20 can be mainly adjusted
according to the cutting amount of the brush-like grinding wheel 1
into the workpiece 20. The resistance force Fr increases as the
cutting amount increases. In the present specification, a cutting
amount refers to a moving amount of a tip end surface of the
brush-like grinding wheel when the brush-like grinding wheel is
further pressed against the workpiece from a state where the tip
end surface of the brush-like grinding wheel is in contact with the
workpiece without applying a stress to the brush. FIG. 7 is a
schematic view illustrating a state in which the brush-like
grinding wheel is further pressed against the workpiece after the
tip end surface of the brush-like grinding wheel is brought in
contact with the workpiece. In FIG. 7, a length D corresponds to
the cutting amount.
[0059] In the present embodiment, in the case of deburring an edge
portion of the workpiece 20, a portion where the deburring function
occurs, and a portion to which the driving force is transmitted
from the workpiece 20, in the brush-like grinding wheel 1, are
different. FIG. 8 is a schematic view illustrating the portion
where the deburring function occurs and the portion to which the
driving force is transmitted from the workpiece 20, in the
brush-like grinding wheel 1. In FIG. 8, the diameter of the
workpiece 20 and the diameter of the brush-like grinding wheel 1
are the same. The arrows in FIG. 8 illustrate rotating directions,
and the workpiece 20 is clockwisely rotated, and the brush-like
grinding wheel 1 is counterclockwisely rotated. In FIG. 8, a
portion where a deburring function occurs is a point A where the
brush-like grinding wheel 1 runs over the workpiece 20, and
portions where a driving force is transmitted from the workpiece 20
to the brush-like grinding wheel 1 are a point a, a point b, a
point c, and the like, where the brush-like grinding wheel 1 is in
contact with the end surface 20a of the workpiece.
[0060] FIG. 9 is a schematic view illustrating distribution of the
magnitude of a force to rotate the brush-like grinding wheel 1 in
the same direction as the rotating direction of the workpiece 20,
and the magnitude of a force to rotate the brush-like grinding
wheel 1 in an opposite direction to the rotating direction of the
workpiece 20. In FIG. 9, the diameter of the workpiece 20 and the
diameter of the brush-like grinding wheel are the same, and the
workpiece 20 is clockwisely rotated. A broken curve 31 is an image
curve illustrating the direction and the distribution of the
magnitude of the force acting on the brush-like grinding wheel
1.
[0061] The curve 31 is the broken line drawn on a left side with
respect to the circumference in the case where the force to rotate
the brush-like grinding wheel 1 acts in an A direction, and is the
broken line drawn on a right side with respect to the circumference
in the case where the force to rotate the brush-like grinding wheel
1 acts in a B direction, at points on the circumference connecting
the points P1 and P2 of the brush-like grinding wheel 1. Further,
the curve 31 is drawn on a position more distant in a horizontal
direction from the circumference of the brush-like grinding wheel 1
as the force to rotate the brush-like grinding wheel 1 in the A
direction or the force to rotate the brush-like grinding wheel 1 in
the B direction becomes larger.
[0062] In FIG. 9, in the case where an area of a region sandwiched
between the circumference of the brush-like grinding wheel 1 and
the curve 31 existing outside the circumference of the brush-like
grinding wheel 1 is designated as Ra, and an area of regions
sandwiched between the circumference of the brush-like grinding
wheel 1 and the curve 31 existing inside the circumference of the
brush-like grinding wheel 1 is designated as Rb, the brush-like
grinding wheel 1 is rotated in the A direction when Ra>Rb, and
the brush-like grinding wheel 1 is rotated in the B direction when
Ra<Rb. When Ra=Rb, the brush-like grinding wheel 1 is not
rotated. In the case where the brush-like grinding wheel 1 is
rotated in the same direction as the rotating direction of the
workpiece 20, slippage occurs at a contact point between the
brush-like grinding wheel 1 and the workpiece 20. Therefore, the
rotation of the workpiece 20 and the rotation of the brush-like
grinding wheel 1 are not synchronized with each other. As a result,
a brushing effect can be sufficiently obtained, and efficiency and
accuracy of deburring and polishing work can be improved. Further,
in the case where the brush-like grinding wheel 1 is rotated in a
direction opposite to the rotating direction of the workpiece 20, a
frictional force between the workpiece 20 and the brush-like
grinding wheel 1 can be made large, and the efficiently of
deburring and polishing can be improved.
[0063] In the case of bringing the brush-like grinding wheel 1 in
contact with the workpiece 20 from the end surface 20a of the
workpiece 20, the end surface 20a being orthogonal to the axis of
rotation of the workpiece 20, whether the brush-like grinding wheel
1 is rotated in the same direction as the rotating direction of the
workpiece 20 or is rotated in the opposite direction to the
rotating direction of the workpiece 20 differs depending on a
magnitude relationship between the diameter of the workpiece 20 and
the diameter of the brush-like grinding wheel 1, the lap
percentage, or the cutting amount. For example, in the case where
the diameter of the workpiece 20 is the same as the diameter of the
brush-like grinding wheel 1, the brush-like grinding wheel 1 tries
to rotate in the opposite direction to the rotating direction of
the workpiece 20 when the lap percentage is less than 100%, the
brush-like grinding wheel 1 is not rotated when the lap percentage
is 100%, and the brush-like grinding wheel 1 tries to rotate in the
same direction as the rotating direction of the workpiece 20 when
the lap percentage exceeds 100%.
[0064] FIG. 10 is a schematic view illustrating a state of bringing
the brush-like grinding wheel 1 in contact with the workpiece 20
from the end surface 20a of the workpiece 20, the end surface 20a
being orthogonal to the axis of rotation of the workpiece 20, where
the workpiece 20 and the brush-like grinding wheel 1 have the same
diameter, the workpiece 20 is clockwisely rotated, and the lap
percentage is set to 50%. Further, FIG. 11 is a schematic view
illustrating a state of bringing the brush-like grinding wheel 1 in
contact with the workpiece 20 from the end surface 20a of the
workpiece 20, the end surface 20a being orthogonal to the axis of
rotation of the workpiece 20, where the workpiece 20 and the
brush-like grinding wheel 1 have the same diameter, the workpiece
20 is clockwisely rotated, and the lap percentage is set to 58.58%.
In these cases, a force to rotate the brush-like grinding wheel 1
in a counterclockwise direction (the direction opposite to the
rotating direction of the workpiece 20) acts on the brush-like
grinding wheel 1 by the rotation of the workpiece 20. When this
force becomes larger than the total sum of the resistance forces Fr
generated when the brush-like grinding wheel 1 runs over the
workpiece 20, the brush-like grinding wheel 1 is rotated in a
counterclockwise direction. The rotational speed of the brush-like
grinding wheel 1 can be controlled according to the rotational
speed of the workpiece and the cutting amount.
[0065] FIG. 12 is a schematic view illustrating a state of bringing
the brush-like grinding wheel 1 in contact with the workpiece 20
from the end surface 20a of the workpiece 20, the end surface 20a
being orthogonal to the axis of rotation of the workpiece 20, where
the workpiece 20 and the brush-like grinding wheel 1 have the same
diameter, the workpiece 20 is clockwisely rotated, and the lap
percentage is set to 150%. In this case, a force to rotate the
brush-like grinding wheel 1 in the clockwise direction (the same
direction as the rotating direction of the workpiece) acts on the
brush-like grinding wheel 1 by the rotation of the workpiece 20.
When this force becomes larger than the total sum of the resistance
forces Fr generated when the brush-like grinding wheel 1 runs on
the workpiece 20, the brush-like grinding wheel 1 is rotated in the
clockwise direction. The rotational speed of the brush-like
grinding wheel 1 can be controlled according to the rotational
speed of the workpiece 20 and the cutting amount.
Second Embodiment
[0066] In the first embodiment, the working method of bringing the
brush-like grinding wheel 1 in contact with the end surface 20a of
the workpiece 20 from the direction along the axis of rotation of
the workpiece 20 has been described. However, in a second
embodiment, a working method of bringing a brush-like grinding
wheel 1 in contact with a side surface 20b of a workpiece will be
described. In the working method according to the second
embodiment, the brush-like grinding wheel 1 is brought in contact
with the side surface 20b of the workpiece that performs a rotary
motion, whereby the brush-like grinding wheel 1 is rotated and
removes burr and unevenness existing on the side surface 20b of the
workpiece.
[0067] FIG. 13 is a schematic view of a case in which a state where
the brush-like grinding wheel 1 is brought in contact with the
workpiece from the side surface 20b is viewed from a side surface
side. In the second embodiment, the shape of the workpiece 20 to be
worked is not particularly limited. However, for example, a
columnar workpiece 20 can be used as illustrated in FIG. 13. The
workpiece 20 is rotated about an axis of rotation W. In FIG. 13,
only a part of a tip end surface of the brush-like grinding wheel 1
is in contact with the side surface 20b of the workpiece to cause
the tip end surface to be inclined with respect to the side surface
20b of the workpiece so that the tip end surface of the brush-like
grinding wheel 1 becomes non-parallel to the side surface 20b of
the workpiece (that is, the tip end surface of the brush-like
grinding wheel 1 becomes non-parallel to a tangential plane of the
side surface 20b of the workpiece). In FIG. 13, the workpiece 20 is
rotated in a direction toward a front side or in a direction toward
a depth side, and when providing kinetic energy to a left end
portion of the tip end surface of the brush-like grinding wheel 1
in the direction toward a front side or in the direction toward a
depth side, the brush-like grinding wheel 1 is rotated. In this
case, the side surface 20b can be polished in a wide range by
changing a position of the side surface 20b of the workpiece 20,
the position being in contact with the brush-like grinding wheel
1.
[0068] On the other hand, FIG. 14 is a schematic view of a case
where a state in which the brush-like grinding wheel 1 is brought
in contact with the workpiece from the side surface 20b is viewed
from an end surface side of the workpiece. In FIG. 14, the
workpiece 20 has a columnar shape and is rotated about the axis of
rotation W. In FIG. 14, only a part of a tip end surface of the
brush-like grinding wheel 1 is in contact with the side surface 20b
of the workpiece to cause the tip end surface of the brush-like
grinding wheel 1 and the side surface 20b and an edge portion of
the end surface 20a of the workpiece to be in contact with each
other, and to cause a foremost side of the tip end surface of the
brush-like grinding wheel 1 not to be in contact with the workpiece
20 so that the tip end surface of the brush-like grinding wheel 1
becomes parallel to the side surface 20b of the workpiece (that is,
the tip end surface of the brush-like grinding wheel 1 becomes
parallel to the tangential plane of the side surface 20b of the
workpiece). In FIG. 14, the workpiece 20 is clockwisely rotated,
and the brush-like grinding wheel 1 is rotated as kinetic energy is
provided in a right-side direction to the tip end surface of the
brush-like grinding wheel 1, the tip end surface being in contact
with the side surface 20b of the workpiece. In the case of removing
burr existing on an edge portion of the side surface 20b of the
workpiece as illustrated in FIG. 14, a portion where a deburring
function occurs is a point where the brush-like grinding wheel 1
runs over the side surface 20b of the workpiece, and a portion
where a driving force is transmitted from the workpiece 20 to the
brush-like grinding wheel 1 is a point where the brush-like
grinding wheel 1 is in contact with the side surface 20b of the
workpiece.
[0069] In the case where the workpiece 20 has a columnar shape,
when the brush-like grinding wheel 1 is brought in contact with the
side surface 20b of the workpiece such that the tip end surface of
the brush-like grinding wheel 1 becomes parallel to the side
surface 20b of the workpiece (that is, the tip end surface of the
brush-like grinding wheel 1 becomes parallel to the tangential
plane of the side surface 20b of the workpiece), the brush-like
grinding wheel 1 is not rotated if the entire tip end surface of
the brush-like grinding wheel 1 is in contact with the side surface
20b. To rotate the brush-like grinding wheel 1, the tip end surface
of the brush-like grinding wheel 1 being in contact with the side
surface 20b of the workpiece not to become parallel to each other,
as illustrated in FIG. 13 or 14, or only a part of the tip end
surface of the brush-like grinding wheel 1 being in contact with
the side surface 20b of the workpiece even if the tip end surface
of the brush-like grinding wheel 1 is in contact with the side
surface 20b of the workpiece to become parallel to each other. That
is, to rotate the brush-like grinding wheel 1 by the motion of the
workpiece 20, a contact surface of the brush-like grinding wheel 1
with the workpiece 20 becoming asymmetrical with respect to an axis
of symmetry is a condition, in the case where a straight line
passing through a rotation center on the tip end surface of the
brush-like grinding wheel 1 and parallel to a direction of a force
received by the brush-like grinding wheel 1 from the workpiece is
defined as the axis of symmetry.
Third Embodiment
[0070] In the first and second embodiments, the working method of
the case where the workpiece 20 performs a rotary motion has been
described. However, in a third embodiment, a working method of a
case where a workpiece 20 is fixed and a brush-like grinding wheel
1 performs an orbital motion will be described.
[0071] FIG. 15 is a schematic view illustrating the third
embodiment according to the working method of the present
invention. In FIG. 15, the workpiece 20 is fixed. A brush rotating
mechanism 13 and one end portion of a shaft 14 are connected to be
rotatable about a longitudinal direction of the shaft 14 as an axis
of rotation. The other end portion of the shaft 14 is connected to
a fixed member 10 of a polishing machine brush via a connection
part 15. Other constitutions of the polishing machine brush are as
described above. In the third embodiment according to the working
method of the present invention, the brush rotating mechanism 13
rotates the shaft 14 and transmits a rotating force from the shaft
14 to the fixed member 10, whereby to cause the brush-like grinding
wheel 1 to perform an orbital motion about the connection part 15
as the axis of rotation. By bringing the brush-like grinding wheel
1 and an edge portion of the workpiece 20 in contact with each
other while causing the brush-like grinding wheel 1 to perform an
orbital motion, the brush-like grinding wheel 1 can be rotated
along the axis of rotation of the brush-like grinding wheel 1 and
can work the workpiece 20. Since the brush-like grinding wheel 1
comes in contact with the workpiece 20 while being rotated, a
contact point in the brush-like grinding wheel 1 with the workpiece
20 is not fixed. Therefore, deburring and polishing effects can be
sufficiently obtained, and extreme wear of only a part of the
brush-like grinding wheel 1 can be prevented and the life of the
brush-like grinding wheel 1 can be elongated.
[0072] The brush rotating mechanism 13 is not particularly limited
as long as the brush rotating mechanism 13 can rotate the shaft 14.
For example, a known motor such as a motor with brush, a brushless
motor, a stepping motor, or the like can be used.
Fourth Embodiment
[0073] A fourth embodiment according to the present invention is a
method of working a workpiece 22, using a polishing machine brush
12 as a polishing tool, while causing the workpiece 22 to perform a
linear motion.
[0074] FIGS. 16(a) and 16(b) are schematic views illustrating an
example of a working method according to the fourth embodiment.
FIGS. 16(a) and 16(b) are views of a case of bringing a brush-like
grinding wheel 1 in contact with the workpiece 22 that performs a
linear motion. FIG. 16(a) is a view as viewed from a direction in
which the brush-like grinding wheel 1 is in contact, and FIG. 16(b)
is a view as viewed from a direction perpendicular to the direction
in FIG. 16(a). In the fourth embodiment, the shape of the workpiece
22 to be worked is not particularly limited. However, for example,
a rectangular parallelepiped workpiece 22 can be used, as
illustrated in FIGS. 16(a) and 16(b), for example. The workpiece 22
performs a linear motion in a left-side direction. In FIGS. 16(a)
and 16(b), only a part of a tip end surface of the brush-like
grinding wheel 1 is in contact with an upper surface of the
workpiece 22 to cause an edge portion formed by a side parallel to
a direction in which the workpiece 22 performs a linear motion, on
the upper surface of the workpiece 22, and the tip end surface of
the brush-like grinding wheel 1 come in contact with each other so
that the tip end surface of the brush-like grinding wheel 1 and the
upper surface of the workpiece 22 become parallel to each other
(that is, the tip end surface of the brush-like grinding wheel 1
becomes parallel to a tangential plane of the upper surface of the
workpiece 22 become parallel to each other). In FIG. 16(b), a
front-side end portion of the tip end surface of the brush-like
grinding wheel 1 is not in contact with the workpiece 22. In FIG.
15, the brush-like grinding wheel 1 is rotated as kinetic energy is
provided in a left-side direction to a contact portion of the tip
end surface of the brush-like grinding wheel 1 with the workpiece
22. Note that the workpiece 22 may perform the linear motion only
in one direction or may perform a reciprocating motion in a
right-left direction. When the workpiece 22 performs a linear
motion to reciprocate on a place where the brush-like grinding
wheel 1 is provided, a deburring effect can be improved.
[0075] Although the contact method of the workpiece 22 and the
brush-like grinding wheel 1 is not particularly limited, from the
viewpoint to increase a rotating force of the brush-like grinding
wheel and to improve the deburring effect, it is favorable that a
contact region of the brush-like grinding wheel with the workpiece
becomes asymmetrical in the case where a straight line passing
through a rotation center in the tip end surface of the brush-like
grinding wheel and parallel to a direction of a force received by
the brush-like grinding wheel from the workpiece 22 is an axis of
symmetry.
[0076] The brush-like grinding wheel 1 is grasped by a tool holder
11 including a grasping member 7 and a fixing jig 8. A method of
fixing the tool holder 11 to a machine tool is not particularly
limited, and an example includes fastening the tool holder 11 to
the machine tool with a screw.
[0077] The brush-like grinding wheel 1 is brought in contact with
the workpiece 22 that performs a linear motion, and the brush-like
grinding wheel 1 is rotated by a force received from the workpiece
22 to work the workpiece 22. Since a contact point in the
brush-like grinding wheel 1 with the workpiece 22 is not fixed,
deburring and polishing effects can be sufficiently obtained, and
extreme wear of only a part of the brush-like grinding wheel 1 can
be prevented and the life of the brush-like grinding wheel 1 can be
elongated.
[0078] Since the deburring and polishing effects are exhibited as
the brush-like grinding wheel is rotated in reaction to the linear
motion of the workpiece 22, it is desirable to adjust a cutting
amount and a speed of the linear motion of the workpiece so that
the brush-like grinding wheel is rotated. The speed of the linear
motion in the workpiece 22 is not particularly limited. However,
the speed is preferably 5 m/min or more, and more preferably 20
m/min or more.
[0079] The working method according to the fourth embodiment
rotates, in a case of conveying the workpiece 22 or the like, the
brush-like grinding wheel 1 using the linear motion in conveying
the workpiece 22 to enable deburring. Further, in the case of
causing the workpiece 22 to perform a reciprocating motion by a
ball screw linear motion unit provided with a drive source such as
a servomotor, the working method according to the fourth embodiment
can rotate the brush-like grinding wheel 1 using the linear motion
of the workpiece 22 to enable deburring.
Fifth Embodiment
[0080] In the fourth embodiment, the working method of the case
where the workpiece 20 performs a linear motion has been described.
However, in a fifth embodiment, a working method of a case where a
workpiece 20 is fixed and a brush-like grinding wheel 1 performs a
linear motion will be described.
[0081] FIG. 17 is a schematic view illustrating the fifth
embodiment according to the working method of the present
invention. FIG. 17 is a view of a case of bringing the brush-like
grinding wheel 1 in contact with the fixed workpiece 22 while
causing the brush-like grinding wheel 1 to perform a linear motion.
In FIG. 17, a ball screw linear motion unit 16 includes a
servomotor 17 and a slide block 18. The brush-like grinding wheel 1
is rotatably grasped by a grasping member (not illustrated), and
the grasping member is connected with the slide block 18. In FIG.
17, only a part of a tip end surface of the brush-like grinding
wheel 1 is in contact with an upper surface of the workpiece 22 to
cause an edge portion formed by a side parallel to a direction in
which the brush-like grinding wheel 1 performs a linear motion, on
the upper surface of the workpiece 22, and the tip end surface of
the brush-like grinding wheel 1 come in contact with each other so
that the tip end surface of the brush-like grinding wheel 1 and the
upper surface of the workpiece 22 become parallel to each other
(that is, the tip end surface of the brush-like grinding wheel 1
becomes parallel to a tangential plane of the upper surface of the
workpiece 22 become parallel to each other). In FIG. 17, a
left-side end portion of the tip end surface of the brush-like
grinding wheel 1 is not in contact with the workpiece 22. In FIG.
17, when the brush-like grinding wheel 1 performs the linear motion
in the direction of the arrow in FIG. 17 using the servomotor 16 as
a drive source, energy to counterclockwisely rotate the brush-like
grinding wheel 1 is provided to a contact portion of the tip end
surface of the brush-like grinding wheel 1 with the workpiece 22,
and the brush-like grinding wheel 1 is rotated. Note that the
brush-like grinding wheel 1 may perform the linear motion only in
one direction or may perform a reciprocating motion. When the
brush-like grinding wheel 1 performs a linear motion to reciprocate
on an edge portion of the workpiece 22, a deburring effect can be
improved. Although not illustrated, the grasping member may be
connected with the fixing jig to connect the fixing jig and the
slide block 18.
EXAMPLES
Example 1
[0082] A brush-like grinding wheel and an end surface of a
workpiece were brought in contact with each other while changing
the lap percentage in conditions of the cutting amount of 0.1 mm
and the rotational speed of the workpiece of 2000 rpm, using the
workpiece with the diameter of 100 mm and the brush-like grinding
wheel with the diameter of 100 mm. The rotating direction of the
brush-like grinding wheel at each lap percentage and the polishing
effect on the workpiece were evaluated. Results are shown in Table
1. In Table 1, the W diameter represents the diameter of the
workpiece, and the B diameter represents the diameter of the
brush-like grinding wheel. Further, "o" indicates a case where the
deburring/polishing effect to the end surface of the workpiece and
its edge portion was exhibited, "NA" indicates that the brush-like
grinding wheel did not act on the end surface of the workpiece and
its edge portion and the deburring/polishing effect was not
exhibited, and "x" indicates that the brush-like grinding wheel was
not rotated.
Examples 2 and 3
[0083] The end surface of the workpiece and the brush-like grinding
wheel were brought in contact with each other, similarly to Example
1, except that the diameter of the workpiece and the diameter of
the brush-like grinding wheel were changed as shown in Table 1. The
rotating direction of the brush-like grinding wheel at each lap
percentage and evaluation of the deburring/polishing effect on the
workpiece are shown in Table 1.
TABLE-US-00001 TABLE 1 Lap percentage (lap distance/radius of
workpiece) 101 to 150 to 5 to 49% 50 to 99% 100% 149% 195% Example
W diameter .smallcircle. .smallcircle. x .smallcircle.
.smallcircle. 1 100 mm Opposite Opposite Forward Forward B diameter
direction direction direction direction 100 mm Example W diameter
.smallcircle. .smallcircle. x .smallcircle. .smallcircle. 2 60 mm
Opposite Opposite Forward Forward B diameter direction direction
direction direction 100 mm Example W diameter .smallcircle.
.smallcircle. x .smallcircle. .smallcircle. 3 80 mm Opposite
Opposite Forward Forward B diameter direction direction direction
direction 100 mm
Examples 4 and 5
[0084] The end surface of the workpiece and the brush-like grinding
wheel were brought in contact with each other, similarly to Example
1, except that the diameter of the workpiece and the diameter of
the brush-like grinding wheel were changed as shown in Table 2. The
rotating direction of the brush-like grinding wheel at each lap
percentage and evaluation of the polishing effect on the workpiece
are shown in Table 2. Note that the largest lap percentage in
Example 4 is 120% and the largest lap percentage in Example 5 is
50%. Both of the examples are a case in which the entire brush-like
grinding wheel is inside the workpiece in top view.
TABLE-US-00002 TABLE 2 Lap percentage (lap distance/radius of
workpiece) 5 to 49% 50% 51 to 99% 100% 100 to 120% Example W
diameter .smallcircle. .smallcircle. .smallcircle. x .smallcircle.
4 100 mm Opposite Opposite Opposite Forward B diameter direction
direction direction direction 60 mm Example W diameter
.smallcircle. NA -- -- -- 5 100 mm Opposite B diameter direction 25
mm
REFERENCE SIGNS LIST
[0085] 1 Brush-like grinding wheel [0086] 2 Linear grinding
materials [0087] 3 Holder [0088] 4 Insertion hole [0089] 5 Spindle
[0090] 6 Grasped member [0091] 7 Grasping member [0092] 8 Fixing
jig [0093] 9 Axial position adjustment member [0094] 10 Fixed
member [0095] 11 Tool holder [0096] 12 Polishing machine brush
[0097] 13 Brush rotating mechanism [0098] 14 Shaft [0099] 15
Connection part [0100] 16 Ball screw linear motion unit [0101] 17
Servomotor [0102] 18 Slide block [0103] 20 Workpiece [0104] 20a
Workpiece end surface [0105] 20b Workpiece side surface [0106] 21
Tool holding member (machine tool) [0107] 22 Workpiece
* * * * *