U.S. patent application number 16/975111 was filed with the patent office on 2021-07-22 for bending device.
This patent application is currently assigned to TY ASSOCIATES. The applicant listed for this patent is TY ASSOCIATES. Invention is credited to Kazuo Imamura, Takahisa Yamamoto.
Application Number | 20210220892 16/975111 |
Document ID | / |
Family ID | 1000005261991 |
Filed Date | 2021-07-22 |
United States Patent
Application |
20210220892 |
Kind Code |
A1 |
Yamamoto; Takahisa ; et
al. |
July 22, 2021 |
BENDING DEVICE
Abstract
A bending tool includes movable dies having a bending line of a
punch and a workpiece therebetween. A support member supports the
movable dies in a manner rotatable into directions opposite to each
other in accordance with bending of the workpiece by the punch. A
body supports the support member in a manner reciprocatable in a
movement direction of the punch in accordance with bending of the
workpiece by the punch. The movable dies have respective reception
faces for the workpiece, respective bending side end portions, and
respective convex circular faces. The support member has respective
concave circular faces which slidably fit respectively with the
convex circular faces. The bending side end portions engage with
each other in accordance with bending of the workpiece by the
punch. A sliding portion moves in a pressing direction of the punch
relative to the body in accordance with bending of the
workpiece.
Inventors: |
Yamamoto; Takahisa;
(Yokohama-shi, JP) ; Imamura; Kazuo;
(Yokohama-shi, JP) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
TY ASSOCIATES |
Yokohama-shi |
|
JP |
|
|
Assignee: |
TY ASSOCIATES
Yokohama-shi
JP
|
Family ID: |
1000005261991 |
Appl. No.: |
16/975111 |
Filed: |
March 19, 2018 |
PCT Filed: |
March 19, 2018 |
PCT NO: |
PCT/JP2018/010825 |
371 Date: |
March 23, 2021 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
B21D 5/01 20130101; B21D
5/0281 20130101; B21D 5/0209 20130101 |
International
Class: |
B21D 5/01 20060101
B21D005/01; B21D 5/02 20060101 B21D005/02 |
Claims
1. A bending tool, comprising: a pair of movable dies arranged such
that a bending line of a punch and a workpiece is interposed
therebetween; a support member for supporting the pair of movable
dies in a manner rotatable into directions opposite to each other
in accordance with bending of the workpiece by the punch; and a
body for supporting the support member in a manner reciprocatable
in a movement direction of the punch in accordance with bending of
the workpiece by the punch, wherein the pair of movable dies have
respective reception faces for the workpiece, respective bending
side end portions formed on the respective reception faces in such
a manner as to face the bending line of the workpiece, and
respective convex circular faces formed to face the support member,
and wherein the support member has respective concave circular
faces which slidably fit respectively with the convex circular
faces, while the bending side end portions of the pair of movable
dies are joined to or fit with each other in accordance with
bending of the workpiece by the punch, and a sliding portion which
moves in a pressing direction of the punch relative to the body in
accordance with bending of the workpiece by the punch.
2. The bending tool according to claim 1, wherein the concave
circular faces of the support member are formed in a continuous
manner.
3. The bending tool according to claim 1, further comprising an
elastic member for restoring the pair of movable dies to rotate in
directions each opposite to the respective directions of rotation
in accordance with bending of the workpiece by the punch, and an
urging member for urging the support member in a direction opposite
to the pressing direction of the workpiece by the punch.
4. The bending tool according to claim 2, further comprising an
elastic member for restoring the pair of movable dies to rotate in
directions each opposite to the respective directions of rotation
in accordance with bending of the workpiece by the punch, and an
urging member for urging the support member in a direction opposite
to the pressing direction of the workpiece by the punch.
Description
TECHNICAL FIELD
[0001] The present invention relates to a bending tool, such as a
press brake, which is used to bend a plate-shaped workpiece made of
sheet metal or the like into a V shape or the like using a die.
BACKGROUND ART
[0002] Hitherto, as a bending tool of this type, there has been
provided a die for bending a metal plate, including a base, a pair
of die members having a reception face for receiving a metal plate
and capable of rocking while distal ends of the reception faces are
joined to each other, and a synchronization mechanism for
synchronizing and rocking the pair of die members, in which a metal
plate is placed on the reception plate in a horizontal position of
the pair of die members, and a portion to be bent of the metal
plate is pressed by a punch, whereby the pair of die members are
moved into an inclined position so that the metal plate is bent
(e.g. see Patent Literature 1).
[0003] The base is provided with fulcrum portions which serve as a
fulcrum on which the pair of die members rock, a slider block for
supporting a back face side of the pair of die members, and a
slider guide hole for reciprocatably guiding the slider block.
[0004] On the back face side of the pair of die members, one
projecting portion is provided, with respect to the fulcrum portion
of the base, on each of a distal end side and a proximal end side
of the die member (four projecting portions in total).
[0005] Further, the base is provided with two guide recessed
portions on each of the distal end side and the proximal end side
which correspond to the projecting portion on the distal end side
and the projecting portion on the proximal end side, respectively,
and slidably guide an outer face of the respective projecting
portions (four guide recessed portions in total).
[0006] Further, the synchronization mechanism is configured to
include a guide pin provided to project at positions symmetrical to
each other on each of both side face sides of the pair of die
members, a guide plate provided along side face sides of the base
and having a long hole into which the guide pin is inserted, a
cover plate on the surface of the guide plate to stop the guide
pin, and the like.
[0007] To bend a metal plate, if a portion to be bent of the metal
plate is pressed by a punch in a horizontal position where, in the
pair of die members, the projecting portion on the proximal end
side is in contact with the guide recessed portion on the proximal
end side of the base and the projecting portion on the distal end
side is separate from the guide recessed portion on the distal end
side, the pair of die members are rocked from the horizontal
position where the reception faces form a plane into a
predetermined angle inclined position where the reception faces are
inclined mirror-symmetrically to each other with respect to a
joined line of the distal ends so that the reception faces form an
angle. In accordance with this rock, in the pair of die members,
the projecting portion on the distal end side approaches the guide
recessed portion on the distal end side and the projecting portion
on the proximal end side separates from the guide recessed portion
on the proximal end side, whereby the die members on the distal end
side lowers. Consequently, the slider block descends in the slider
guide hole.
PRIOR ART DOCUMENT
Patent Literature
[0008] Patent Literature 1: JP2011-206823A
SUMMARY OF INVENTION
Technical Problem
[0009] However, there has been a problem that such a conventional
bending tool has a configuration in which the projecting portions
(four projecting portions in total) of the pair of die members are
made to separate from or approach the guide recessed portions (four
guide recessed portions in total) of the base, whereby the pair of
die members rock about the fulcrum portions so that the guide
recessed portions have a complicated curved surface shape and are
difficult to be manufactured, and allowing the pair of die members
to rock with high accuracy results in increased costs.
[0010] There has been also a problem that the projecting portion on
the proximal end side of the pair of die members is made to slide
along the guide recessed portion on the proximal end side of the
base so that a bending angle of a metal plate cannot be made small,
which results in a larger size of the pair of die members in the
orientation direction and increased sizes.
[0011] Further, there has been a problem that in addition to the
base and the pair of die members, as the synchronization mechanism,
the guide plate into which the guide pin of the pair of die members
are inserted and the cover plate, etc. are required to be provided
so that the number of components increases, which requires time,
efforts, and labors in assembling and disassembling the whole tool
and results in increased costs.
[0012] Further, there has been a problem that a guide pin provided
to project from each of both the side face sides of the pair of die
members is inserted into the long hole of the guide plate provided
along the side face sides of the base, and the cover plate stops
the guide pin so as to cause not only a larger size in a width
direction intersecting the orientation of the pair of die members
and sizes to increase but also severe abrasions due to abutting
between the guide pin and the long hole, which results in a
decreased working ratio due to the inoperability for a long
period.
Solution to Problem
[0013] To solve such a problem, a bending tool of the present
invention includes: a pair of movable dies arranged such that a
bending line of a punch and a workpiece is interposed therebetween;
a support member for supporting the pair of movable dies in a
manner rotatable into directions opposite to each other in
accordance with bending of the workpiece by the punch; and a body
for supporting the support member in a manner reciprocatable in a
movement direction of the punch in accordance with bending of the
workpiece by the punch, in which the pair of movable dies have
respective reception faces for the workpiece, respective bending
side end portions formed on the respective reception faces in such
a manner as to face the bending line of the workpiece, and
respective convex circular faces formed to face the support member,
and the support member has respective concave circular faces which
slidably fit respectively with the convex circular faces, while the
bending side end portions of the pair of movable dies are joined to
or fit with each other in accordance with bending of the workpiece
by the punch, and a sliding portion which moves in a pressing
direction of the punch relative to the body in accordance with
bending of the workpiece by the punch.
BRIEF DESCRIPTION OF DRAWINGS
[0014] FIG. 1 is an explanatory diagram illustrating an entire
configuration of a bending tool according to an embodiment of the
present invention, in which FIG. 1a is a longitudinal sectional
front view prior to bending; FIG. 1b is a longitudinal sectional
front view where a workpiece is bend by 135.degree.; and FIG. 1c is
a longitudinal sectional front view where the workpiece is bent by
90.degree.
[0015] FIG. 2 is a perspective view of a lower die, in which FIG.
2a is a perspective view prior to bending; FIG. 2b is a
longitudinal sectional front view where a workpiece is bend by
135.degree.; and FIG. 2c is a longitudinal sectional front view
where the workpiece is bent by 90.degree..
[0016] FIG. 3 is a perspective view illustrating a workpiece
bending state in cooperation with a punch, in which FIG. 3a is a
reduced perspective view prior to bending; FIG. 3b is a reduced
perspective view where a workpiece is bend by 135.degree.; and FIG.
3c is a reduced perspective view where the workpiece is bent by
90.degree..
[0017] FIG. 4 is an explanatory view illustrating a modification
example of the bending tool according to an embodiment of the
present invention (perspective view of the lower die), in which
FIG. 4a is a perspective view prior to bending; and FIG. 4b is a
perspective view where a workpiece is bend by 135.degree..
DESCRIPTION OF EMBODIMENTS
[0018] Hereinafter, embodiments of the present invention will be
described in detail in conjunction with the drawings.
[0019] As illustrated in FIGS. 1-4, a bending tool A according to
an embodiment of the present invention is a bending press for
bending a plate-shaped workpiece W into a V shape or the like in
cooperation with a punch P which is an upper die and a pair of
movable dies 1, 2 which serve as a lower die.
[0020] As the workpiece W, for example, a sheet metal of steel,
stainless steel, aluminum, etc. or a thin plate similar thereto is
used, and both flat plate portions W2, W2 are pushed to be bent
(thrusted to be bent), such that a bending line W1 is interposed
therebetween, to a certain angle by abutting against a blade
portion P1 of the punch P.
[0021] The bending tool A is preferably used to be incorporated in
a press brake (unillustrated) or the like. When the bending tool A
is incorporated in a press brake, a bending angle of the workpiece
W is detected during a workpiece W bending process and this bending
angle is fed back to a numerical control (NC) wirelessly or wiredly
so that the bending angle of the workpiece W can be automatically
modified by adjusting a movement amount of the punch P.
[0022] In more detail, the bending tool A according to an
embodiment of the present invention includes as main components: a
pair of movable dies 1, 2 arranged such that the bending line W1 of
the punch P and the workpiece W is interposed therebetween; a
support member 3 for supporting the pair of movable dies 1, 2 in a
manner rotatable in directions opposite to each other in accordance
with bending of the workpiece W by the punch P; and a body 4 for
supporting the support member 3 in a manner reciprocatable in a
movement direction of the punch P in accordance with bending of the
workpiece W by the punch P.
[0023] Further, preferably, an elastic member 5 for restoring the
pair of movable dies 1, 2 to rotate in directions each opposite to
the respective directions of rotation in accordance with bending of
the workpiece W by the punch P, and an urging member 6 for urging
the support member 3 in a direction opposite to a pressing
direction of the workpiece W by the punch P are provided.
[0024] Note that the punch P and the pair of movable dies 1, 2 are
typically arranged in such a manner as to face each other in a
vertical direction, and the movement direction of the punch P will
be hereinafter referred to as "Z direction". A width direction of
the pair of movable dies 1, 2 intersecting Z direction will be
referred to as "X direction", and an arrangement direction
(alignment direction) of the pair of movable dies 1, 2 intersecting
Z direction will be referred to as "Y direction".
[0025] The pair of movable dies 1, 2 are formed of a hard material,
such as metal, and in a belt shape and have respective reception
faces 11, 21 which come into contact with both the flat plate
portions W2, W2 of the workpiece W placed thereon.
[0026] In the pair of movable dies 1, 2, the reception faces 11, 21
have respective bending side end portions 11a, 21a formed on a
front side to face both the flat plate portions W2, W2 of the
workpiece W in Z direction and facing the bending line W1 of the
workpiece W in Z direction.
[0027] In the first movable die 1, the bending side end portion 11a
of the reception face 11 is formed over the entirety of the
reception face 11 in X direction. In the second movable die 2, the
bending side end portion 21a of the reception face 21 is formed
over the entirety of the reception face 21 in X direction.
[0028] Further, the pair of movable dies 1, 2 have respective
convex circular faces 12, 22 which protrude toward the support
member 3 described below, and respective stoppers 13, 23 which abut
against a stopping portion 41 of the body 4 described below.
[0029] The convex circular faces 12, 22 and the stoppers 13, 23 are
formed in the pair of movable dies 1, 2 on a back side facing the
support member 3 and the body 4 described below in Z direction.
[0030] The convex circular faces 12, 22 have a substantially
quarter circular side shape as seen from X direction and are formed
in a continuous manner in the same shape over the entirety of the
pair of movable dies 1, 2 in X direction, respectively.
[0031] By way of specific example, as illustrated in FIGS. 1a, 1b,
and 1c to 4a and 4b, the convex circular faces 12, 22 are formed in
a substantially quarter circular shape about a rotation fulcrum
portions 1o, 2o, respectively, and are configured to have the same
size such that respective rotation radii are equal to each
other.
[0032] Further, although other examples are unillustrated, the
convex circular faces 12, 22 may be formed in a substantially
quarter circular shape such that respective rotation radii are
different from each other (have different sizes), and may be
modified to a configuration other than that as illustrated in the
figures.
[0033] In an initial state prior to bending of a workpiece as
illustrated in FIGS. 1a, 2a, 3a, and 4a, the stopper 13, 23 are
configured such that the reception faces 11, 21 are disposed in a
horizontal position to form a continuous plane by abutting the
stoppers 13, 23 against the stopping portion 41 of the body 4
described below.
[0034] The support member 3 is formed of a hard material, such as
metal, and in a prismatic shape, etc. including a square pole and
has respective concave circular faces 31, 32 which constantly
slidably fit with the convex circular faces 12, 22 of the pair of
movable dies 1, 2.
[0035] The concave circular faces 31, 32 have a substantially
quarter circular side shape as seen from X direction in such a
manner as to slidably fit in a concavo-convex manner with the
convex circular faces 12, 22, and are formed in a continuous manner
in the same shape over the entirety of the support member 3 in X
direction, respectively. Thus, it is a configuration that the
convex circular faces 12, 22 are made to slide along the concave
circular faces 31, 32, whereby the pair of movable dies 1, 2 as a
whole rotate (rock) simultaneously about the rotation fulcrum
portions 1o, 2o, respectively, in directions opposite to each
other. The rotation fulcrum portions 1o, 2o are parallel axial
lines each extending in X direction. In other words, the support
member 3 has a synchronization mechanism for synchronizing and
rotating (rocking) the pair of movable dies 1, 2.
[0036] Further, as illustrated in FIGS. 1-4, the concave circular
faces 31, 32 are preferably formed in a continuous manner in a
substantially semicircular side shape as seen from X direction.
[0037] By way of specific example, as illustrated in FIGS. 1a, 1b,
and 1c to 4a and 4b, the concave circular faces 31, 32 are formed
in a substantially quarter circular shape such that respective
rotation radii are equal to each other (have the same size) and the
concave circular faces 31, 32 are configured to be continuous to
have a substantially semicircular shape.
[0038] Accordingly, the rotation fulcrum portions 1o, 2o of the
pair of movable dies 1, 2 are disposed in such a manner as to be
substantially in agreement with each other at corner positions or
at positions adjacent to the corner positions of the bending side
end portions 11a, 21a, respectively.
[0039] Further, although other examples are unillustrated, in
accordance with the convex circular faces 12, 22, the concave
circular faces 31, 32 may be formed in a substantially quarter
circular shape such that respective rotation radii are different
from each other (have different sizes), and may be modified to a
configuration other than that as illustrated in the figures.
[0040] Further, the support member 3 has a sliding portion 33 which
moves in the pressing direction of the punch P relative to the body
4 in accordance with bending of the workpiece W by the punch P.
[0041] The sliding portion 33 is formed on an outer face of the
support member 3 in such a manner as to face a guide portion 42
described below in XY direction in a certain area of the body 4
described below in Z direction.
[0042] By way of example, with respect to the pair of movable dies
1, 2 and the support member 3, as illustrated in FIGS. 1a, 1b, and
1c to 3a, 3b and 3c, the rotation fulcrum portions 1o, 2o of the
pair of movable dies 1, 2 are disposed at the corner positions of
the bending side end portions 11a, 21a, respectively, the corner
portions of the bending side end portions 11a, 21a are linearly
joined to each other along the bending line W1 of the workpiece W
in X direction, and while this joined state is maintained, the
reception faces 11, 21 rotate (rock) in directions opposite to each
other from the horizontal position toward an inclined position.
[0043] Further, by way of another example, with respect to the pair
of movable dies 1, 2 and the support member 3, as illustrated in
FIGS. 4a and 4b, at the bending side end portions 11a, 21a of the
pair of movable dies 1, 2, rugged portions 11b, 21b are provided on
a more distal end side than the rotation fulcrum portions 1o, 2o.
Accordingly, the rugged portions 11b, 21b of the bending side end
portions 11a, 21a fit with each other along the bending line W1 of
the workpiece W in X direction, and while this fitted state is
maintained, the reception faces 11, 21 rotate (rock) in directions
opposite to each other from the horizontal position toward the
inclined position.
[0044] In the illustrated examples, the bending side end portions
11a, 21a of the pair of movable dies 1, 2 are provided with the
plural rectangular rugged portions 11b, 21b at certain intervals in
X direction, respectively, and these plural rectangular rugged
portions 11b, 21b are made to movably fit with each other in Z
direction.
[0045] Note that, although other modification examples are
unillustrated, such a modification that the bending side end
portions 11a, 21a of the pair of movable dies 1, 2 are provided
with the plural triangular rugged portions 11b, 21b at certain
intervals in X direction, respectively, and these plural triangular
rugged portions 11b, 21b are made to movably fit with each other in
Z direction, etc., are possible.
[0046] The body 4 is formed of a hard material, such as metal, and
in a hexahedral shape, etc. including a rectangular prism and has
the stopping portion 41 to face the stoppers 13, 23 of the pair of
movable dies 1, 2 in Z direction, and the guide portion 42 for
supporting the support member 3 in a manner reciprocatable in a
certain area within the body 4 in Z direction.
[0047] The stopping portion 41 is formed in a surface shape on an
upper surface of the body 4 or the like.
[0048] The guide portion 42 is formed on an inner face of the body
4 in such a manner as to abut against or engage with the sliding
portion 33 of the support member 3 at least into Y direction in a
certain area of the body 4 in Z direction. Thus, the guide portion
42 is configured such that the support member 3 is not caused by
bending of the workpiece W by the punch to be displaced at least in
Y direction and movably supported in a certain area of the body 4
in Z direction.
[0049] In other words, the body 4 is provided with a movement
restriction means for restricting a movement range of the support
member 3.
[0050] By way of specific example, with respect to the body 4, as
illustrated in FIGS. 1a, 1b, and 1c to 4a and 4b, the guide portion
42 is formed in a recessed shape at an upper side center of the
body 4, and the support member 3 is movably supported at an inner
side of the guide portion 42 by the guide portion 42 in such a
manner as to be not rotatable in X and Y directions and to be
movable in Z direction. As the movement restriction means of the
support member 3 relative to the body 4, an upper restriction of
the support member 3 is made by abutting in Z direction between a
follower portion 6a (braking portion 6c) described below which is
provided to the support member 3 and reciprocatable in Z direction
and a braking face 43 of the body 4. A lower restriction of the
support member 3 is made by abutting in Z direction between a
bottom face 34 of the support member 3 and a recessed bottom face
44 of the body 4.
[0051] Further, the body 4 is provided with rock fulcrum portions
4o which abut against or is in sliding contact with the pair of
movable dies 1, 2, respectively. The rock fulcrum portions 4o are
parallel axial lines extending in X direction to face boundary
portions 14, 24 between the convex circular faces 12, 22 and the
stoppers 13, 23 of the pair of movable dies 1, 2, respectively. In
the illustrated examples, corner portions composed of guide faces
42a of the guide portion 42 in X direction which the sliding
portion 33 of the support member 2 abut against or engage with and
the stopping portion 41 serve as the rock fulcrum portions 4o.
[0052] Further, although other examples are unillustrated, the
guide portion 42 may be modified to have a shape other than that as
illustrated in the figures and the movement restriction means of
the support member 3 relative to the body 4 may be modified to a
configuration other than that as illustrated in the figures.
[0053] In addition, preferably, with respect to the body 4, a width
(X direction) of the body 4 corresponding to the workpiece W in the
width direction is modularized and the plural bodies 4 can be set
in alignment in X direction.
[0054] Consequently, in bending of the workpiece W having a width
greater than the width of the body 4, the entirety of the workpiece
W in the width direction can be bent at a time in cooperation with
the plural set of movable dies 1, 2 aligned in the width direction
in X direction in accordance with the width of the workpiece W and
the punch P greater than the width of the workpiece P.
[0055] The elastic members 5 are made of an elastic material and
provided over the pair of movable dies 1, 2 and the body 4, and
configured to urge the pair of movable dies 1, 2 constantly toward
the body 4 to restore the reception faces 11, 21 from the inclined
position to the horizontal position, respectively.
[0056] By way of specific example, as illustrated in FIGS. 1a, 1b,
and 1c to 4a and 4b, the elastic members 5 extend over from the
back side of the pair of movable dies 1, 2 to recessed portions 45
of the body 4 and is elastically provided with spring members 5a in
Z direction, respectively. In the illustrated examples, the spring
members 5a are a coil spring, and the spring members 5a are
respectively provided to the pair of movable dies 1, 2.
[0057] Further, although other examples are unillustrated, the
spring members 5a may be modified to that other than a coil spring
and the plural elastic members 5 (spring members 5a) may be
respectively provided to the pair of movable dies 1, 2.
[0058] The urging member 6 is provided over the support member 3
and the body 4 and configured to urge the support member 3
constantly toward the pair of movable dies 1, 2.
[0059] By way of specific example, as illustrated in FIGS. 1a, 1b,
and 1c to 4a and 4b, the urging member 6 includes the follower
portion 6a provided to the support member 3 and supported
reciprocatably in Z direction relative to the body 4 and an elastic
member 6b elastically provided around the follower portion 6a and
elastically deformable in Z direction. In the illustrated examples,
the follower portion 6a is a stripper bolt and a head portion
thereof has the braking portion 6c, and the elastic member 6b is a
coil spring.
[0060] Further, although other examples are unillustrated, the
urging member 6 may be modified to a configuration other than the
follower portion 6a and the elastic member 6b, the follower portion
6a and the elastic member 6b may be modified to have a shape other
than that as illustrated in the figures, and the elastic member 6b
may be modified to that other than a coil spring.
[0061] Next, operations of the bending tool A according to an
embodiment of the present invention will be described.
[0062] First, in an initial state prior to bending of a workpiece
as illustrated in FIGS. 1a, 2a, 3a, and 4a, the elastic members 5
allow the stoppers 13, 23 of the pair of movable dies 1, 2 to abut
against the stopper portion 41 of the body 4 to temporarily fix the
reception faces 11, 21 in the horizontal position,
respectively.
[0063] In the subsequent workpiece W bending process, the punch P
relatively approaches the workpiece W placed on the reception faces
11, 21 of the pair of movable dies 1, 2, respectively, the blade
portion P1 of the punch P thrusts against the workpiece W to press
the bending side end portions 11a, 21a side of the pair of movable
dies 1, 2 in Z direction, respectively.
[0064] As illustrated in FIGS. 1b, 1c, 2b, 2c, 3b, 3c, and 4b, in
accordance with pressing by the punch P, while the convex circular
faces 12, 22 of the pair of movable dies 1, 2 fit with and slide
along the concave circular faces 31, 32 of the support member 3,
the pair of movable dies 1, 2 as a whole rotate (rock) against the
elastic force by the elastic member 5 about the rotation fulcrum
portions 1o, 2o, respectively, in directions opposite to each
other. Accordingly, the reception faces 11, 21 move from the
horizontal position to the inclined position.
[0065] Simultaneously, in accordance with the inclination of the
reception faces 11, 21, the sliding portion 33 of the support
member 3 for supporting the pair of movable dies 1, 2 move
(descend) relative to the guide portion 42 of the body 4 against
the urging force by the urging member 6 in the pressing direction
of the punch P (Z direction).
[0066] In accordance with the inclination of the reception faces
11, 21 and the movement of the support member 3, the bending line
W1 of the workpiece W moves in the pressing direction of the punch
P and bending into a V shape is performed.
[0067] Then, after bending of the workpiece W, the punch P is
relatively separated from the workpiece W in Z direction, whereby
due to the elastic force by the elastic member 5, the pair of
movable dies 1, 2 as a whole rotate (rock) about the rotation
fulcrum portions 1o, 2o, respectively, in directions opposite to
each other, and the reception faces 11, 21 restore from the
inclined position to the horizontal position. Simultaneously, due
to the urging force by the urging member 6, the support member 3
returns (ascends) relative to the body 4 in the movement direction
of the punch P (Z direction).
[0068] Accordingly, the stoppers 13, 23 of the pair of movable dies
1, 2 abut against the stopping portion 41 of the body 4, which
returns to the initial state. Thereafter, the above operations are
repeated.
[0069] In such a bending tool A according to an embodiment of the
present invention, in accordance with pressing of the workpiece W
by the punch P, the convex circular faces 12, 22 of the pair of
movable dies 1, 2 fit with and slide along the concave circular
faces 31, 32 of the support member 3, respectively, the pair of
movable dies 1, 2 as a whole accordingly rotate (rock) in
directions opposite to each other. Thereby, while the bending side
end portions 11a, 21a of the pair of movable dies 1, 2 are joined
to or fit with each other, the reception faces 11, 21 are
inclined.
[0070] Simultaneously, the inclination of the reception faces 11,
21, allows the sliding portion 33 of the support member 3 for
supporting the pair of movable dies 1, 2 to move relative to the
body 4 in the pressing direction of the punch P. Accordingly, the
bending line W1 of the workpiece W moves in the pressing direction
of the punch P and bending into a V shape, etc. is performed.
[0071] Thus, the workpiece W can be reliably bent by a simple
configuration.
[0072] Consequently, compared with conventional ones having a
configuration in which the projecting portions (four projecting
portions in total) of the pair of die members are made to separate
from or approach the guide recessed portions (four guide recessed
portions in total) of the base, whereby the pair of die members
rock about the fulcrum portions, the simplicity of shapes of the
convex circular faces 12, 22 of the pair of movable dies 1, 2 and
the concave circular faces 31, 32 of the support member 3 which fit
with each other and slide along with respect to each other
comparatively facilitates manufacture, allows the pair of movable
dies 1, 2 to reversely rotate with high accuracy, and can
contribute to decreasing costs.
[0073] Compared with conventional ones in which the projecting
portion on the proximal end side of the pair of die members is made
to slide along the guide recessed portion on the proximal end side
of the base, the decrease in the number of the convex circular
faces 12, 22 of the pair of movable dies 1, 2 and the concave
circular faces 31, 32 of the support member 3 allows the convex
circular faces 12, 22, the concave circular faces 31, 32 and a
bending angle of the workpiece W to be greatly smaller and allows
the entirety of the toll to be made compact in the arrangement
direction of the pair of movable dies 1, 2
[0074] Further, compared with conventional ones in which in
addition to the base and the pair of die members, as the
synchronization mechanism, the guide plate into which the guide pin
of the pair of die members are inserted and the cover plate, etc.
are required to be provided, main components are the four parts
which are the pair of movable dies 1, 2, the support member 3, and
the body 4, which can significantly decrease the number of parts,
greatly reduce time in assembling and disassembling the whole tool,
improve work efficiency, and contribute to further decreasing
costs.
[0075] Further, compared with conventional ones in which a guide
pin provided to project from each of both the side face sides of
the pair of die members is inserted into the long hole of the guide
plate provided along the side face sides of the base, and the cover
plate stops the guide pin, no portion projecting from the pair of
movable dies 1, 2, such as a pin, is provided in the width
direction (X direction), which allows the whole tool to be made
compact in the width direction (X direction), and there is no
abutting between a projecting portion, such as a pin, and a
recessed portion, such as a long hole, which causes less abrasions,
allows operations over a long time, and contributes to improving a
working ratio.
[0076] Particularly, the concave circular faces 31, 32 of the
support member 3 are preferably formed in a continuous manner. In
this case, the concave circular faces 31, 32 can be manufactured at
the same time.
[0077] Thus, the concave circular faces 31, 32 can be easily
manufactured at the same time.
[0078] Consequently, compared with conventional ones requiring the
base to be provided with the guide recessed portions (four in
total), the concave circular faces 31, 32 can be manufactured with
high manufacturing accuracy and manufacturing costs can be
decreased.
[0079] Further, preferably, the elastic member 5 for restoring the
pair of movable dies 1, 2 to rotate in directions each opposite to
the respective directions of rotation in accordance with bending of
the workpiece W by the punch P, and the urging member 6 for urging
the support member 3 in a direction opposite to the pressing
direction of the workpiece W by the punch P are provided.
[0080] In this case, after bending of the workpiece, pressing by
the punch P is cancelled, whereby using the elastic member 5, the
pair of movable dies 1, 2 as a whole rotate (rock) in directions
opposite to each other, and the reception faces 11, 21 restore from
the inclined position to the horizontal position, while using the
urging member 6, the support member 3 returns relative to the body
4. Accordingly, the pair of movable dies 1, 2 return to the initial
state.
[0081] Thus, after bending of the workpiece W, the pair of movable
dies 1, 2 can be smoothly restored.
[0082] Consequently, bending of the workpiece W can be repeatedly
carried out at a high speed and a manufacturing speed can be
improved.
[0083] Note that in the above embodiments, the reception faces 11,
21 are returned from the inclined position to the horizontal
position using the elastic member 5, which is, however, not
limitative, but the pair of movable dies 1, 2 may be configured
such that the pair of movable dies 1, 2 automatically rotate (rock)
in opposite directions in accordance with cancellation of pressing
by the punch P by adjusting the gravitational center balance of the
pair of movable dies 1, 2.
[0084] Further, the width of the body 4 is modularized, which is,
however, not limitative, but the width of the body 4 may be
configured to be greater than the width of the workpiece W to be
bent.
REFERENCE SIGNS LIST
[0085] A bending tool [0086] P punch [0087] 1, 2 movable die [0088]
11, 21 reception face [0089] 11a, 21a bending side end portion
[0090] 12, 22 convex circular face [0091] 3 support member [0092]
31, 32 concave circular face [0093] 33 sliding portion [0094] 4
body [0095] 5 elastic member [0096] 6 urging member [0097] W
workpiece [0098] W1 bending line
* * * * *