U.S. patent application number 16/810078 was filed with the patent office on 2020-09-17 for stamping method and stamping apparatus.
This patent application is currently assigned to TOYOTA BOSHOKU KABUSHIKI KAISHA. The applicant listed for this patent is TOYOTA BOSHOKU KABUSHIKI KAISHA. Invention is credited to Taira ITO, Shigeo SUMIYAMA, Yuta YAMAKITA.
Application Number | 20200290106 16/810078 |
Document ID | / |
Family ID | 1000004721039 |
Filed Date | 2020-09-17 |
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United States Patent
Application |
20200290106 |
Kind Code |
A1 |
SUMIYAMA; Shigeo ; et
al. |
September 17, 2020 |
STAMPING METHOD AND STAMPING APPARATUS
Abstract
A stamping method includes: punching out a product from a
workpiece by using a die on which the conveyed workpiece is placed,
a punch, and a back pressure portion; displacing the workpiece
upward with respect to the die when the punch moves away from the
die; before the product is punched out, providing a protrusion that
protrudes downward and is located at a part of the workpiece, the
part being on the upstream side in a workpiece conveying direction
of a punch-out portion and aligned with the punch-out portion; and
using the protrusion, which is displaced downstream in the
conveying direction together with the workpiece, to push the
product downstream in the conveying direction, so that the product
is ejected to the outside.
Inventors: |
SUMIYAMA; Shigeo;
(Toyota-shi, JP) ; YAMAKITA; Yuta; (Nisshin-shi,
JP) ; ITO; Taira; (Toyota-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TOYOTA BOSHOKU KABUSHIKI KAISHA |
Aichi-ken |
|
JP |
|
|
Assignee: |
TOYOTA BOSHOKU KABUSHIKI
KAISHA
Aichi-ken
JP
|
Family ID: |
1000004721039 |
Appl. No.: |
16/810078 |
Filed: |
March 5, 2020 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21D 28/26 20130101 |
International
Class: |
B21D 28/26 20060101
B21D028/26 |
Foreign Application Data
Date |
Code |
Application Number |
Mar 14, 2019 |
JP |
2019-047483 |
Claims
1. A stamping method for punching out a product from a workpiece
that is conveyed intermittently, the method comprising: punching
out the product from the workpiece by using a die on which the
conveyed workpiece is placed, a punch that is arranged to approach
and move away from the die, and a back pressure portion that is
provided in the die and is urged toward the punch to apply a back
pressure to the workpiece; displacing the workpiece upward with
respect to the die when the punch moves away from the die; before
the product is punched out, providing a protrusion that protrudes
downward and is located at a part of the workpiece, wherein the
part is on an upstream side in a workpiece conveying direction of a
punch-out portion, from which the product is punched out, and is
aligned with the punch-out portion; and using the protrusion, which
is displaced downstream in the conveying direction together with
the workpiece, to push the product downstream in the conveying
direction, so that the product is ejected to the outside.
2. The stamping method according to claim 1, comprising providing
the protrusion by performing half-blanking on the workpiece.
3. The stamping method according to claim 1, comprising providing
the protrusion at a position that corresponds to opposite ends in a
width direction of the punch-out portion, wherein the width
direction is orthogonal to both the conveying direction and a
direction in which the punch approaches and moves away from the
die.
4. A stamping apparatus for punching out a product from a workpiece
that is conveyed intermittently, the apparatus comprising: a
punch-out mechanism that includes a die on which the conveyed
workpiece is placed, a punch that is arranged to approach and move
away from the die, and a back pressure portion that is provided in
the die and is urged toward the punch to apply a back pressure to
the workpiece, wherein the punch-out mechanism is configured to
punch out the product from the workpiece by using the die, the
punch, and the back pressure portion; a protrusion providing
mechanism that is configured to provide a protrusion that protrudes
downward and is located at a part of the workpiece, wherein the
part is on an upstream side in a workpiece conveying direction of a
punch-out portion, from which the product is punched out, and is
aligned with the punch-out portion; and a displacing mechanism that
is configured to displace the workpiece to a position where the
protrusion and the product are aligned with each other in the
conveying direction when the punch moves away from the die.
Description
BACKGROUND
1. Field
[0001] The following description relates to a stamping method and a
stamping apparatus.
2. Description of Related Art
[0002] Conventionally, fine blanking has been known as a method of
punching out a product from a plate-shaped workpiece using a die
and a punch. In fine blanking, a plate holding member, a die, a
punch, and a back-up member, which is provided inside the die, are
used. Specifically, the opposite sides of a workpiece are held by
the die and the plate holding member, and a product is punched out
from the workpiece using the die and the punch while the workpiece
is held from the side opposite to the punch by the back-up
member.
[0003] Japanese Laid-Open Patent Publication No. 2005-262294
discloses an apparatus that takes out a product to the outside from
a fine blanking press. The apparatus of the publication includes a
nozzle for drawing in air and uses the nozzle to apply suction to
the product, thereby ejecting the product to the outside.
[0004] Since the apparatus of the above-described publication is
required to have a nozzle to eject the punched product, the
structure of the apparatus as a whole is complicated.
SUMMARY
[0005] It is an objective of the present disclosure to provide a
stamping method and a stamping apparatus that are capable of
ejecting products using a simple structure.
[0006] This Summary is provided to introduce a selection of
concepts in a simplified form that are further described below in
the Detailed Description. This Summary is not intended to identify
key features or essential features of the claimed subject matter,
nor is it intended to be used as an aid in determining the scope of
the claimed subject matter.
[0007] In a general aspect, a stamping method for punching out a
product from a workpiece that is conveyed intermittently is
provided. The method includes: punching out the product from the
workpiece by using a die on which the conveyed workpiece is placed,
a punch that is arranged to approach and move away from the die,
and a back pressure portion that is provided in the die and is
urged toward the punch to apply a back pressure to the workpiece;
displacing the workpiece upward with respect to the die when the
punch moves away from the die; before the product is punched out,
providing a protrusion that protrudes downward and is located at a
part of the workpiece, wherein the part is on an upstream side in a
workpiece conveying direction of a punch-out portion, from which
the product is punched out, and is aligned with the punch-out
portion; and using the protrusion, which is displaced downstream in
the conveying direction together with the workpiece, to push the
product downstream in the conveying direction, so that the product
is ejected to the outside.
[0008] In another general aspect, a stamping apparatus for punching
out a product from a workpiece that is conveyed intermittently is
provided. The apparatus includes a punch-out mechanism, a
protrusion providing mechanism, and a displacing mechanism. The
punch-out mechanism includes a die on which the conveyed workpiece
is placed, a punch that is arranged to approach and move away from
the die, and a back pressure portion that is provided in the die
and is urged toward the punch to apply a back pressure to the
workpiece. The punch-out mechanism is configured to punch out the
product from the workpiece by using the die, the punch, and the
back pressure portion. The protrusion providing mechanism is
configured to provide a protrusion that protrudes downward and is
located at a part of the workpiece. The part is on an upstream side
in a workpiece conveying direction of a punch-out portion, from
which the product is punched out, and is aligned with the punch-out
portion. The displacing mechanism is configured to displace the
workpiece to a position where the protrusion and the product are
aligned with each other in the conveying direction when the punch
moves away from the die.
[0009] Other features and aspects will be apparent from the
following detailed description, the drawings, and the claims.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a cross-sectional view of a stamping method and a
stamping apparatus according to one embodiment, illustrating the
structure of the stamping apparatus.
[0011] FIG. 2 is a plan view of a workpiece illustrating
protrusions of the embodiment together with a punch-out
portion.
[0012] FIG. 3 is a cross-sectional view of the stamping method of
the embodiment, illustrating a state in which the workpiece has
been conveyed to a protrusion providing mechanism.
[0013] FIG. 4 is a cross-sectional view of the stamping method of
the embodiment, illustrating a state in which protrusions have been
provided on the workpiece.
[0014] FIG. 5 is a cross-sectional view of the stamping method of
the embodiment, illustrating a state in which the workpiece has
been conveyed to a punch-out mechanism.
[0015] FIG. 6 is a cross-sectional view of the stamping method of
the embodiment, illustrating a state in which the workpiece is held
by a second lower die assembly and a second upper die assembly.
[0016] FIG. 7 is a cross-sectional view of the stamping method of
the embodiment, illustrating a state in which a product has been
punched out from the workpiece by a second punch.
[0017] FIG. 8 is a cross-sectional view of the stamping method of
the embodiment, illustrating a state in which the product is lifted
by a back pressure portion.
[0018] FIG. 9 is a cross-sectional view of the stamping method of
the embodiment, illustrating a state in which the product is being
pushed toward an ejection portion by protrusions.
[0019] FIG. 10 is a plan view of a workpiece illustrating a
protrusion of a modification together with a punch-out portion.
[0020] Throughout the drawings and the detailed description, the
same reference numerals refer to the same elements. The drawings
may not be to scale, and the relative size, proportions, and
depiction of elements in the drawings may be exaggerated for
clarity, illustration, and convenience.
DETAILED DESCRIPTION
[0021] This description provides a comprehensive understanding of
the methods, apparatuses, and/or systems described. Modifications
and equivalents of the methods, apparatuses, and/or systems
described are apparent to one of ordinary skill in the art.
Sequences of operations are exemplary, and may be changed as
apparent to one of ordinary skill in the art, with the exception of
operations necessarily occurring in a certain order. Descriptions
of functions and constructions that are well known to one of
ordinary skill in the art may be omitted.
[0022] Exemplary embodiments may have different forms, and are not
limited to the examples described. However, the examples described
are thorough and complete, and convey the full scope of the
disclosure to one of ordinary skill in the art.
[0023] A stamping method and a stamping apparatus 10 according to
an embodiment will be described with reference to FIGS. 1 to 9.
[0024] The stamping apparatus 10 of the present embodiment is
employed in a progressive stamping apparatus, which is configured
to subject a plate-shaped workpiece, which is intermittently
conveyed by a feeder (not shown), to multiple steps such as a
piercing step and a punching-out step in a single apparatus.
[0025] As shown in FIG. 1, the stamping apparatus 10 is designed to
punch out a product P from a workpiece 100, which is conveyed from
left to right in FIG. 1. The product P of the present embodiment is
a gear having teeth on the outer circumference. Hereinafter, the
conveying direction of the workpiece 100 will be simply referred to
as conveying direction Y, and the upstream side and the downstream
side of the conveying direction Y will be referred to as the
upstream side and the downstream side. A direction that is
orthogonal to both the conveying direction Y and the vertical
direction will be referred to as a width direction.
[0026] The stamping apparatus 10 includes a protrusion providing
mechanism 20, a punch-out mechanism 50, and a displacing mechanism
90. The protrusion providing mechanism 20 is configured to provide
downward protrusions 101 in the workpiece 100. The punch-out
mechanism 50 is provided on the downstream side of the protrusion
providing mechanism 20 and is configured to punch out the product P
from the workpiece 100. The displacing mechanism 90 is configured
to displace the workpiece 100 upward.
[0027] First, the protrusion providing mechanism 20 will be
described.
[0028] The protrusion providing mechanism 20 includes a first lower
die assembly 30, which has two first dies 31, and a first upper die
assembly 40, which has two first punches 41. The conveyed workpiece
100 is placed on the first dies 31. The first punches 41 are
arranged to approach and move away from the first dies 31 in the
vertical direction. The first upper die assembly 40 is arranged to
approach and move away from the first lower die assembly 30.
[0029] Each first punch 41 has a circular shape in the cross
section orthogonal to the vertical direction.
[0030] The first upper die assembly 40 has recesses in the lower
surface. The recesses receive two first holding members 42, which
hold the workpiece 100 against the first dies 31. The first punches
41 are arranged to be projected from and retracted into the lower
surfaces of the first holding members 42.
[0031] When the first punches 41 are lowered toward the first dies
31, two protrusions 101 each having a circular cross section are
provided in the workpiece 100. The protrusions 101 of the present
embodiment are dowels that are protruded downward by performing
half-blanking on the workpiece 100. The protruding amount of the
protrusions 101 from the lower surface of the workpiece 100
(hereinafter, simply referred to as the protruding amount) is
smaller than the thickness of the workpiece 100.
[0032] The two first dies 31 are spaced apart from each other in a
width direction X. The two first punches 41 and the two holding
members 42 correspond to the two first dies 31.
[0033] Accordingly, the two protrusions 101 of the workpiece 100
are spaced apart from each other in the width direction X as shown
in FIG. 2. The workpiece 100 has a punch-out portion 102, from
which the product P will be punched out. The protrusions 101 are
provided in a part that is on the upstream side of the punch-out
portion 102 and aligned with the punch-out portion 102. The
protrusions 101 are provided at positions that correspond to the
opposite sides of the punch-out portion 102 in the width direction
X. The protrusions 101 are provided in a feed bridge of the
workpiece 100, which connects the punch-out portion 102 to the
subsequent punch-out portion 102, which will be punched out after
the first punch-out portion 102.
[0034] In this manner, the workpiece 100, on which the protrusions
101 are provided, is conveyed to the punch-out mechanism 50, which
is located on the downstream side of the protrusion providing
mechanism 20.
[0035] The punch-out mechanism 50 will now be described.
[0036] As shown in FIG. 1, the punch-out mechanism 50 includes a
second lower die assembly 60, which has a second die 61, and a
second upper die assembly 70, which has a second punch 71. The
workpiece 100 is placed on the second die 61. The second punch 71
is arranged to approach and move away from the second die 61. The
second upper die assembly 70 is arranged to approach and move away
from the second lower die assembly 60. The second die 61 has a gear
forming portion on the inner circumferential surface, and the
second punch 71 has a gear forming portion on the outer
circumferential surface. The second die 61 corresponds to the die
of the present disclosure. The second punch 71 corresponds to the
punch of the present disclosure.
[0037] The second die 61 incorporates a back pressure portion 80,
which is urged toward the second punch 71 to apply a back pressure
to the workpiece 100. The back pressure portion 80 includes a
pushing member 81, which pushes the workpiece 100 from below, and
an urging portion 82, which urges the pushing member 81 upward. In
a state in which the pushing member 81 is not pushed by the second
punch 71, the upper surface of the pushing member 81 and the upper
surface of the second die 61 are flush with each other. The pushing
member 81 has a gear forming portion on the outer circumferential
surface.
[0038] The urging portion 82 of the present embodiment may be a gas
cylinder unit that includes, for example, a cylinder and a piston
rod that is reciprocal in the cylinder.
[0039] The second upper die assembly 70 has a recess in the lower
surface. The recess receives a second holding member 72, which
holds the workpiece 100 against the second die 61. The second punch
71 is arranged to be projected from and retracted into the lower
surface of the second holding member 72.
[0040] The displacing mechanism 90 will now be described.
[0041] The displacing mechanism 90 is provided in a part of the
second lower die assembly 60 that is on the upstream side of the
second die 61, and is configured to displace the workpiece 100
upward with respect to the second die 61. Specifically, the
displacing mechanism 90 is provided in an accommodating portion 62,
which is provided in the second lower die assembly 60 and is open
upward. The displacing mechanism 90 includes a clamp portion 91,
which clamps the workpiece 100 in the vertical direction, and a
compression spring 92, which is provided in the accommodating
portion 62 to urge the clamp portion 91 upward.
[0042] Escape portions 63, which open upward, are provided in a
part of the upper surface of the second lower die assembly 60 that
is between the displacing mechanism 90 and the second die 61 in the
conveying direction Y. The escape portions 63 are designed to allow
the protrusions 101 of the workpiece 100 to escape into when the
workpiece 100 is punched out, such that the workpiece 100 is placed
along the upper surface of the second lower die assembly 60. The
depth of the escape portions 63 is greater than the protruding
amount of the protrusions 101.
[0043] An accommodating portion 73, which opens downward, is
provided in a part of the lower surface of the second upper die
assembly 70 that is on the upstream side of the second holding
member 72. The accommodating portion 73 is designed to accommodate
the upper part of the clamp portion 91 of the displacing mechanism
90 when the second lower die assembly 60 and the second upper die
assembly 70 are clamped.
[0044] The second lower die assembly 60 has an ejection portion 64
in a part that is on the downstream side of the second die 61. The
ejection portion 64 ejects the product P, which has been punched
out by the second punch 71, to the outside of the second lower die
assembly 60. The ejection portion 64 is a through-hole that has a
diameter larger than the diameter of the product P and extends
vertically through the second lower die assembly 60.
[0045] The stamping method of punching out the product P from the
workpiece 100 using the stamping apparatus 10 will now be
described.
[0046] First, as shown in FIG. 3, the workpiece 100 is conveyed to
the protrusion providing mechanism 20 by a feeder, such that the
workpiece 100 is placed on the first dies 31.
[0047] As shown in FIG. 4, the workpiece 100 is held between the
first lower die assembly 30 and the first upper die assembly 40.
Then, the first punches 41 are lowered to perform half-blanking on
the workpiece 100 to provide the protrusions 101 (protrusion
providing step).
[0048] As shown in FIG. 5, the workpiece 100, on which the
protrusions 101 are provided, is conveyed to the punch-out
mechanism 50. At this time, the workpiece 100 is conveyed such that
the protrusions 101 are located at positions directly above the
escape portions 63 of the second lower die assembly 60.
[0049] Next, the second upper die assembly 70 is lowered as shown
in FIG. 6, so that the workpiece 100 is held by the second lower
die assembly 60 and the second upper die assembly 70. At this time,
the upper part of the clamp portion 91 of the displacing mechanism
90 is accommodated in the accommodating portion 73 of the second
upper die assembly 70. The clamp portion 91 is pushed by the second
upper die assembly 70 so as to be displaced downward. Also, the
protrusions 101 of the workpiece 100 are accommodated in the escape
portions 63 of the second lower die assembly 60. Accordingly, the
workpiece 100 is placed on the second die 61 while being in
accordance with the upper surface of the second lower die assembly
60.
[0050] Next, the second punch 71 is lowered as shown in FIG. 7, so
that the second die 61, the second punch 71, and the back pressure
portion 80 punch out the product P from the workpiece 100
(punching-out step).
[0051] Next, the second punch 71 is moved away from the second die
61 and the second upper die assembly 70 is lifted as shown in FIG.
8. At the same time, the displacing mechanism 90 displaces the
workpiece 100, from which the product P has been punched out,
upward with respect to the second die 61 (displacing step).
[0052] The displacing mechanism 90 displaces the workpiece 100
upward to a position where the protrusions 101 are aligned with the
product P in the conveying direction Y. The amount by which the
workpiece 100 is displaced from the upper surface of the second
lower die assembly 60 by the displacing mechanism 90 is greater
than the thickness of the product P and smaller than the sum of the
thickness of the product P and the protruding amount of the
protrusions 101. In the present embodiment, the workpiece 100 is
displaced upward to a position where a small clearance exists
between the lower surface of the workpiece 100 and the upper
surface of the product P. Thus, the displacement amount is the sum
of the thickness of the product P and the clearance.
[0053] The product P remains on the pushing member 81 in a state in
which the workpiece 100 has been displaced upward by the displacing
mechanism 90.
[0054] When the workpiece 100 is conveyed further as shown in FIG.
9, the protrusions 101 are displaced downstream in the conveying
direction together with the workpiece 100. The protrusions 101 are
caused to abut against the upstream end of the product P, so that
the product P is pushed downstream. Accordingly, the product P is
ejected to the outside through the ejection portion 64 (ejection
step).
[0055] As described above, the product P is produced from the
workpiece 100.
[0056] The operation and advantages of the present embodiment will
now be described.
[0057] (1) In the punching-out step, the product P is punched out
from the workpiece 100 by the second die 61, on which the conveyed
workpiece 100 is placed, the second punch 71, which is arranged to
approach and move away from the second die 61, and the back
pressure portion 80, which is provided in the second die 61 and is
urged toward the second punch 71 to apply a back pressure to the
workpiece 100. In the displacement step, the workpiece 100 is
displaced upward with respect to the second die 61 when the second
punch 71 moves away from the second die 61. In the protrusion
providing step, the protrusions 101, which protrude downward, are
provided prior to the punching-out step. The protrusions 101 are
located in a part that is on the upstream side in the conveying
direction Y of the workpiece 100 of the punch-out portion 102, from
which the product P will be punched out. The part is also aligned
with the punch-out portion 102. In the ejection step, the
protrusions 101, which are displaced downstream in the conveying
direction Y together with the workpiece 100, push the product P
downstream in the conveying direction Y, so that the product P is
ejected to the outside.
[0058] With this method, the product P, which has been punched out
by the second die 61, the second punch 71, and the back pressure
portion 80, remains on the back pressure portion 80. The workpiece
100 is displaced upward with respect to the second die 61 when the
second punch 71 moves away from the second die 61. With the
above-described method, the protrusions 101, which protrude
downward, are provided in the workpiece 100 before the product P is
punched out. Accordingly, the product P on the back pressure
portion 80 is pushed downstream in the conveying direction Y by the
protrusions 101 as the workpiece 100 is conveyed, so that the
product P is ejected to the outside. Since the above-described
method ejects the product P to the outside by utilizing the
conveyance of the workpiece 100, no additional devices for ejecting
the product P to the outside are needed. The product P is ejected
to the outside by a simple method.
[0059] In a case of a configuration that includes a device for
ejecting products P to the outside, the ejection step of a product
P is completed before the workpiece is conveyed for the
punching-out step of the subsequent product P. This extends the
manufacturing time by the amount of time corresponding to the
ejection step of the product P.
[0060] In this regard, the above-described method ejects the
product P as the workpiece 100 is conveyed before the subsequent
product P is punched out. This shortens the time required for the
stamping process. The productivity of the stamping process is thus
improved.
[0061] (2) Half-blanking is performed on the workpiece 100 to
provide the protrusions 101.
[0062] When, for example, magnets that are separate from the
workpiece 100 are provided as protrusions on the lower surface of
the workpiece 100, an operation for retrieving the magnets may be
necessary.
[0063] In this regard, the above-described method does not require
such an operation since the protrusions 101 are provided integrally
with the workpiece 100. This improves the productivity of the
stamping process.
[0064] (3) The protrusions 101 are provided at positions that
correspond to the opposite sides of the punch-out portion 102 in
the width direction X.
[0065] With this method, as the workpiece 100 is conveyed, the
protrusions 101, which are provided at positions corresponding to
the opposite sides in the width direction X of the punch-out
portion 102, push the opposite sides in the width direction X of
the product P. The product P is thus ejected in a reliable
manner.
[0066] (4) The stamping apparatus 10 includes the punch-out
mechanism 50, the protrusion providing mechanism 20, and the
displacing mechanism 90. The punch-out mechanism 50 includes the
second die 61, on which the conveyed workpiece 100 is placed, the
second punch 71, which is arranged to approach and move away from
the second die 61, and the back pressure portion 80, which is
provided in the second die 61 and is urged toward the second punch
71 to apply a back pressure to the workpiece 100. The punch-out
mechanism 50 is configured to punch out the product P from the
workpiece 100 by using the second die 61, the second punch 71, and
the back pressure portion 80. The protrusion providing mechanism 20
is configured to provide the protrusions 101, which protrude
downward, in a part that is located on the upstream side in the
conveying direction Y of the workpiece 100 of the punch-out portion
102 of the workpiece 100, from which the product P will be punched
out. The part is aligned with the punch-out portion 102. The
displacing mechanism 90 is configured to displace the workpiece 100
to a position where the protrusions 101 and the product P overlap
with each other in the vertical direction when the second punch 71
moves away from the second die 61.
[0067] This configuration achieves an operational advantage similar
to the above-described operational advantage (1).
[0068] The present embodiment may be modified as follows. The
present embodiment and the following modifications can be combined
as long as the combined modifications remain technically consistent
with each other.
[0069] The ejection portion 64 may be a belt conveyor that conveys
the product P to the outside.
[0070] The pushing member 81 may incorporate a lifter that is urged
toward the second punch 71 and lifts the product P above the upper
surface of the pushing member 81 in the displacement step. In this
case, since the pushing member 81 is prevented from closely
contacting the product P, the product P is easily ejected. At this
time, the amount by which the workpiece 100 is displaced from the
upper surface of the second lower die assembly 60 by the displacing
mechanism 90 simply needs to be greater than the sum of the
thickness of the product P and the protruding amount of the lifter
from the upper surface of the second lower die assembly 60 and
smaller than the sum of the thickness of the product P, the
protruding amount of the lifter from the upper surface of the
second lower die assembly 60, and the protruding amount of the
protrusions 101.
[0071] Two or more displacing mechanisms 90 may be provided on the
upstream side and the downstream side of the second die 61 as
necessary.
[0072] The number, the shape, and the arrangement of the
protrusions 101 may be changed in accordance with the shape of the
product P as necessary. For example, as shown in FIG. 10, instead
of multiple protrusions 101, a single protrusion 103, which extends
along the circumferential direction of the punch-out portion 102
may be provided on the upstream side of the punch-out portion 102
and at a position aligned with the center in the width direction X
of the punch-out portion 102.
[0073] The protrusions are not limited to the ones that are
provided by performing half-blanking on the workpiece 100. The
protrusions may be provided through burring. The protrusions may be
provided on the workpiece 100 by attaching magnets on the lower
surface of the workpiece 100.
[0074] The range in application of the stamping apparatus 10 is not
limited to the product P, which has gear teeth on the outer
circumference. The stamping apparatus 10 of the present embodiment
can be employed in producing products having various shapes as long
as those are punched out of a plate-shaped workpiece.
[0075] Various changes in form and details may be made to the
examples above without departing from the spirit and scope of the
claims and their equivalents. The examples are for the sake of
description only, and not for purposes of limitation. Descriptions
of features in each example are to be considered as being
applicable to similar features or aspects in other examples.
Suitable results may be achieved if sequences are performed in a
different order, and/or if components in a described system,
architecture, device, or circuit are combined differently, and/or
replaced or supplemented by other components or their equivalents.
The scope of the disclosure is not defined by the detailed
description, but by the claims and their equivalents. All
variations within the scope of the claims and their equivalents are
included in the disclosure.
* * * * *