Bending processing device

Abstract

To provide a bending processing device that can perform stable bending processing over a long period without causing warping in a movable die even when a workpiece is placed on only a portion of the movable die in the longitudinal direction and bending processing is performed.SOLUTION: A bending processing device includes: a punch P; a main body 10; and multiple movable dies 30. In the multiple movable dies 30, the pair of movable dies 30 arranged opposite to each other in the short-direction of the main body 10 and rotating in opposite directions following pressing of the punch P is constituted as a movable die unit 30A. A movable die unit group 30B that forms a placement surface that can support a workpiece W is constituted by arranging the multiple movable die units 30A adjacently along the longitudinal direction of the main body 10. The multiple movable die units 30A that constitutes the movable die unit group 30B are constituted so as to be movable independently following the pressing of the punch P.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a bending device, and more particularly to a bending device that bends a plate-shaped workpiece into a V-shape or the like using a die. [Background technology]

[0002] A bending device having a pair of movable dies, a support member that supports the pair of movable dies so that they can rotate freely in opposite directions, and a main body that supports the support member so that it can move back and forth in the moving direction of the punch is known as prior art (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6487612 Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the above-mentioned conventional bending device is configured to bend a plate-shaped workpiece W into a V shape or the like by cooperation of an upper punch P and a pair of movable dies D serving as a lower die, as shown in FIG. 6(a). This bending apparatus is composed of a pair of movable dies D whose mounting surfaces for placing the workpiece W extend in the longitudinal direction. Therefore, for example, if the workpiece W is placed only on a portion of the longitudinal direction of the pair of movable dies D and the workpiece W is bent, a greater press pressure acts through the workpiece W on the portion D1 on which the workpiece W is placed than on the portion D2 on which the workpiece is not placed. Therefore, if such bending is performed continuously and for a long period of time, warping (dotted line D3 in Figure 6(b)) may occur in the portion D2 on which the workpiece W is not placed, leaving room for improvement.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and has an object to provide a bending device that can perform stable bending without warping of the movable die over a long period of time, even when the workpiece is placed on only a part of the longitudinal direction of the movable die and bending is performed. [Means for solving the problem]

[0006] In view of the above problems, one aspect of the present invention has the following configuration. A bending apparatus comprising a punch for pressing a workpiece, a main body forming a base, and a plurality of movable dies for supporting the workpiece, wherein the plurality of movable dies are configured as a movable die unit consisting of a pair of movable dies arranged opposite each other in the short direction of the main body and rotating in opposite directions in response to pressing by the punch, the movable die units are arranged adjacent to each other along the longitudinal direction of the main body to form a movable die unit group that forms a mounting surface capable of supporting the workpiece, and the plurality of movable die units that constitute the movable die unit group are configured to be independently movable in response to pressing by the punch. Effect of the Invention

[0007] Due to the above-mentioned configuration, the bending apparatus of the present invention has the exceptional effect of being able to perform stable bending without warping of the movable die over a long period of time, even when the workpiece is placed on only a portion of the longitudinal direction of the movable die and bending is performed. [Brief description of the drawings]

[0008] [Figure 1] 1 is a perspective view of a bending apparatus according to an embodiment of the present invention, as viewed from above. [Diagram 2] Figure 2(a) is a schematic oblique view of the main body of the bending device from above, Figure 2(b) is a schematic side view of the main body, Figure 2(c) is a schematic front view of the main body, and Figure 2(d) is a schematic plan view of the main body. [Diagram 3]Figure 3(a) is a schematic perspective view of each functional component from below with the main body of the bending device removed, and Figure 3(b) is a schematic diagram explaining the positional relationship between the movable die, support member, and support rod of the bending device. [Figure 4] 4A and 4B are schematic perspective views illustrating the state of bending a workpiece by the bending device, in which FIG. 4A shows the state before bending, and FIG. 4B shows the state during bending. [Diagram 5] 5A and 5B are schematic front views (partially in cross section) illustrating the state of bending a workpiece by the bending device, where FIG. 5A shows the state before bending, and FIG. 5B shows the state during bending. [Figure 6] FIG. 6(a) is a schematic perspective view showing a conventional bending device, and FIG. 6(b) is a conceptual diagram for explaining warpage that occurs during bending of a workpiece. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a bending device according to the present invention will be described with reference to the drawings.

[0010] Fig. 1 is a perspective view of the bending apparatus according to this embodiment, seen from above. As shown in Fig. 1, the bending apparatus 1 according to this embodiment includes a punch P for pressing a workpiece W (see Fig. 4(a)), a main body 10 forming a base, a plurality of support members 20 provided on the main body 10 so as to be movable up and down, and a plurality of movable dies 30 for supporting the workpiece W. The multiple movable dies 30 are configured as a movable die unit 30A, with a pair of movable dies 30 arranged opposite each other in the short side direction of the main body 10, and these movable die units 30A are arranged adjacent to each other in the longitudinal direction of the main body 10 to configure a movable die unit group 30B.

[0011] This bending device 1 is configured to be able to fold a plate-shaped workpiece W (see FIG. 4(a)) into a V shape or the like along a folding line W1 by cooperation of a punch P and a plurality of movable dies 30. The workpiece W is made of, for example, sheet metal such as iron, stainless steel, or aluminum, or a similar thin plate, and is bent (thrust-bent) at a predetermined angle along a bending line W1 by contact with the blade P1 of the punch P.

[0012] An example of a specific configuration of the bending device 1 according to this embodiment will be described below. Fig. 2(a) is a schematic perspective view of the main body of the bending device from above, Fig. 2(b) is a schematic side view of the main body, Fig. 2(c) is a schematic front view of the main body, and Fig. 2(d) is a schematic plan view of the main body.

[0013] <Main body> The main body 10 constitutes a base of the bending apparatus 1. The main body 10 is formed of a hard material such as metal, and is formed as a structure having a generally rectangular shape in plan view (see FIG. 2(d)) having long sides (longitudinal direction) and short sides (shortitudinal direction) in plan view.

[0014] The main body 10 is composed of a support surface 11 that supports the movement limiting surfaces 32 (see Figure 3 (b)) of the multiple movable dies 30 from below, an accommodating groove 12 that accommodates and supports the support member 20 so that it can move up and down, a plurality of through holes 13 that open into the bottom surface 12b of the accommodating groove 12, a plurality of concave portions 14 formed in the upper half of both side surfaces 10a of the main body 10, and a pin support hole 15 that is formed horizontally between both end surfaces 10b of the main body 10 and the lower parts of the concave portions 14, and between the lower parts of each adjacent concave portion 14 in the longitudinal direction.

[0015] [Support surface] The support surfaces 11 are arranged in a pair at a distance in the short-side direction of the main body 10 to sandwich the accommodation groove 12. The pair of support surfaces 11 are flat surfaces extending horizontally from one end to the other end in the longitudinal direction of the main body 10, and function as support surfaces that support a movement restriction surface 32 (see FIG. 3(b)) of the movable die 30 described later from below. Specifically, as shown in FIG. 1, in an initial state before bending of the workpiece W, each movement restriction surface 32 of each movable die 30 constituting the movable die unit group 30B is supported by abutting against the support surface 11, so that each upper surface 31 of each movable die 30 is arranged horizontally to form a continuous, substantially coplanar surface.

[0016] [Housing Groove] 2(a), the accommodation groove 12 is formed between a pair of support surfaces 11 in a groove shape (concave shape) that is recessed downward from one end to the other end in the longitudinal direction of the main body 10. The accommodation groove 12 forms an accommodation section that accommodates a plurality of support members 20 (see FIG. 3) adjacent to each other in the longitudinal direction so that the support members 20 can move up and down. An inner surface 12a of the accommodation groove 12 functions as a guide surface that guides the support member 20 in the up-down direction while in contact with the side surface 22 (see FIG. 3(b)) of the support member 20 that moves up and down. In other words, the multiple support members 20 are each slidably disposed in the accommodation groove 12. Note that "slide" refers to sliding in contact (moving while sliding).

[0017] [Through hole] 2(a) and 2(b), a plurality of through holes 13 that penetrate vertically are provided at predetermined intervals in the bottom surface 12b of the accommodation groove 12. The through holes 13 function as support holes that support and guide a support rod 50 (see FIG. 3), which will be described later, so that the support rod 50 can move vertically.

[0018] As shown in Figure 2(b), each through hole 13 has a first through portion 13a extending vertically and opening to the bottom surface 12b of the accommodating groove 12, a second through portion 13b extending vertically and connected to the lower end of the first through portion 13a, and a third through portion 13c extending vertically and connected to the second through portion 13b.

[0019] The first through portion 13a and the third through portion 13c are formed with a larger diameter than the second through portion 13b, and a first step portion 13d and a second step portion 13e are formed at the boundary (connection portion) between the first through portion 13a and the second through portion 13b, and at the boundary (connection portion) between the second through portion 13b and the third through portion 13c, respectively.

[0020] The first penetrating portion 13a accommodates a second elastic body 60 (see FIG. 3(a)), which is, for example, a coil spring, and surrounds the body portion 52 (see FIG. 3(b)) of the support rod 50. The lower end of the second elastic body 60 is supported by the first step portion 13d (see FIG. 5).

[0021] The second through portion 13b functions as a support guide portion that supports a part of the body portion 52 of the support rod 50 so that the part can slide in the vertical direction. The second through portion 13b allows the support rod 50 to move up and down stably. The third through-hole 13c accommodates the head 51 (see FIG. 3(b)) of the support rod 50 so that the head 51 can move up and down. When the head 51 of the support rod 50 moves upward, the head 51 is stopped (contacted) by the second step 13e, and further upward movement is restricted (see FIG. 5(a)).

[0022] In addition, in the main body 10 of this embodiment, ten through holes 13 are formed adjacent to each other in the longitudinal direction of the main body 10, and each through hole 13 corresponds to ten support rods 50 arranged in pairs for each support member 20 (five members).

[0023] [Concave portion 14] As shown in Fig. 2(a), a plurality of recesses 14 extending in the vertical direction are formed on both side surfaces 10a of the main body 10. The recesses 14 are formed in both side surfaces 10a of the main body 10 in a recessed (concave) shape that is recessed (depressed) from the support surface 11 to approximately the center of the main body 10 in the height direction, and their upper ends open to the upper surface of the main body 10. The recesses 14 form a storage section that stores a first elastic body 40 (see Fig. 4) described later.

[0024] [Pin support hole] 2(a) and (c), pin support holes 15 are formed horizontally penetrating between both end faces 10b of the main body 10 and the lower parts of the recessed parts 14, and between the lower parts of adjacent recessed parts 14 in the longitudinal direction. The pin support holes 15 function as supports for supporting both ends of the support pins 42 (see FIG. 3(a)) that support the lower ends 40b of the first elastic bodies 40.

[0025] <Functional components arranged on the main body> Next, we will explain each functional member arranged in the main body 10. Fig. 3(a) is a schematic perspective view of each functional member seen from below with the main body of the bending device removed, and Fig. 3(b) is a schematic view explaining the positional relationship between the movable die, support member, and support rod of the bending device.

[0026] [Support rod] 3(b), the support rod 50 has a rod-shaped body 52 and a head 51 provided at one end of the body 52. ​​The support rod 50 is formed of, for example, a bolt member such as a stripper bolt made of a metal material. The support rod 50 is provided in the through hole 13 of the main body 10 so as to be vertically movable, and the other end of the body 52 is attached to the support member 20 (see FIG. 3(b)). A part of the body 52 is slidably supported in the second through portion 13b of the through hole 13.

[0027] A head portion 51 of the support rod 50, when housed in the through hole 13, is loosely fitted (housed) in the third through portion 13c of the through hole 13 so as to be movable up and down. The head portion 51 is configured to be locked (contacted) with a second step portion 13e formed at the boundary between the third through portion 13c and the second through portion 13b, thereby restricting further upward movement.

[0028] In addition, a threaded portion (not shown) is formed at the tip of the support rod 50 (the other end side of the body 52) to screw into multiple screw holes 20a (two in the illustrated example) formed in the support member 20, and this threaded portion is screwed into and attached to the screw holes 20a of the support member 20. Therefore, the support member 20 and the support rod 50 move up and down as a unit due to the pressing action of the punch P.

[0029] In the illustrated example, a pair of support rods 50 are provided for each support member 20 (five in number), and the two support rods 50 attached to each support member 20 are supported and guided in the vertical direction by a pair of adjacent through holes 13 in the main body 10. Therefore, the pair of support rods 50 allows each support member 20 to move up and down in the vertical direction independently and stably. The number of support rods 50 provided for each support member 20 is not limited to the above example. A single support rod 50 may be provided for each support member 20.

[0030] [Support member] 3(b), the support member 20 is formed of a hard material such as metal in a prismatic shape including a quadrangular prism. The support member 20 supports a pair of movable dies 30 (movable die units 30A) that rotate in opposite directions in response to the pressure of the punch P, and has an upper surface formed with a concave arc surface 21 that is always in sliding contact with the convex arc surfaces 33 of the pair of movable dies 30 (movable die units 30A) while always fitting together (in contact with each other).

[0031] The concave arcuate surface 21 has an approximately semicircular side shape when viewed from the longitudinal direction of the main body 10, and is formed continuously in the same shape over the entire length of the support member 20 so that it can slide in engagement with the convex arcuate surfaces 33 of a pair of movable dies 30 (movable die units 30A). Therefore, the pair of movable dies 30 (movable die units 30A) can simultaneously rotate (swing) in opposite directions about the upper edges 34a of the opposing end faces 34 of the pair of movable dies 30 (movable die units 30A) by sliding the convex arcuate surfaces 33 along the concave arcuate surface 21 of the support member 20. This rotation (swing) makes the upper surfaces 31 of the pair of movable dies 30 approximately V-shaped.

[0032] In addition, both side surfaces 22 of each support member 20 are guided (slid) independently in the vertical direction while in contact with the inner surface 12a of the accommodation groove 12 formed in the main body 10. Therefore, each movable die unit 30A supported by each support member 20 can independently and stably move in the pressing direction (vertical direction) and rotate as the punch P bends the workpiece.

[0033] Each support member 20 is provided with a plurality of screw holes 20a (two in the illustrated example) for attaching the support rod 50. In the illustrated example, two screw holes 20a are formed at positions spaced a predetermined distance from the longitudinal center of the support member 20. A screw portion (not shown) formed at the tip of each support rod 50 is screwed into these screw holes 20a. In this manner, each support member 20 is supported by a pair of support rods 50 that sandwich the longitudinal center of the support member. Therefore, each movable die unit 30A supported by each support member 20 can independently and stably move in the pressing direction (up and down direction) and rotate as the punch P bends the workpiece.

[0034] In addition, the upper end of a second elastic body 60 housed in the first through portion 13a of the through hole 13 formed in the main body 10 abuts against the lower surface 23 of each support member 20 (see Figure 5), and an upward elastic force of the second elastic body 60 acts on each support member 20.

[0035] [Movable die] 1, the multiple movable dies 30 are arranged opposite each other in the short side direction of the main body 10, and each of the movable dies 30 is configured as a pair of movable dies 30 that rotate in opposite directions in response to the pressure of the punch P. The multiple movable die units 30A are adjacently arranged in the longitudinal direction in the accommodation groove 12 formed in the main body 10, thereby configuring a movable die unit group 30B capable of supporting the workpiece W.

[0036] The upper surface 31 of each movable die 30 constituting the movable die unit group 30B forms a support surface on which a flat workpiece W is placed, and forms a flat, continuous, uniform workpiece receiving surface in the initial state before bending of the workpiece W (see Figures 1 and 4(a)).

[0037] Each movable die 30 is formed in a strip shape from a hard material such as metal. The pair of movable die units 30A constituting the movable die unit 30A are symmetrical in the short-side direction of the main body 10. As shown in Figures 3(a) and (b), each movable die unit 30A is supported by one support member 20, and each movable die unit 30A is configured to be independently movable (rotatable).

[0038] Further, a movement restricting surface 32 that faces the support surface 11 of the main body 10 is formed on the back surface (bottom surface) of each movable die 30 in the initial state before bending the workpiece W. This movement restricting surface 32 is configured to be supported by contacting the support surface 11 of the main body 10. As shown in Fig. 1, this movement restricting surface 32 is supported by contacting the support surface 11 of the main body 10 in the initial state before bending the workpiece W, thereby functioning to configure the upper surface 31 of each movable die 30 constituting the movable die unit group 30B as a flat, continuous, uniform workpiece receiving surface. In addition, the opposing end faces 34 of the pair of movable dies 30 constituting each movable die unit 30A are in opposing contact with each other, with each movable die unit 30A forming a continuous, flush workpiece receiving surface.

[0039] Further, on the back surface of the end portion on the opposing end surface 34 side of each movable die 30, a convex arc surface 33 having an arc-shaped cross section that protrudes toward the support member 20 is formed. The convex arc surface 33 has a substantially quarter-circular side shape as viewed from the longitudinal direction of the main body 10, and is continuously formed in the same shape over the entire length of each movable die 30 in the longitudinal direction (the same direction as the longitudinal direction of the main body 10). The convex arc surface 33 is supported rotatably (slidably) in a state where it is always fitted (in contact) with the concave arc surface 21 of the support member 20.

[0040] A screw hole 30a for connecting with the upper end side of a first elastic body 40 (see FIG. 3(a)) made of an elastic body such as a coil spring is formed in the center of the side part on the outer side in the short side direction (opposite the opposing end face 34) of each movable die 30. A screw portion 41a of a mounting member 41 configured to be connectable with the upper end of the first elastic body 40 is screwed into the screw hole 30a.

[0041] [First elastic body] 3(a), the first elastic body 40 is provided across the central portion on the outer end portion 35 side of each movable die 30 and the lower portion of the recessed portion 14 formed in the main body 10, and is configured to bias the movement restricting surface 32 of each movable die 30 toward the support surface 11 of the main body 10. The first elastic body 40 is configured, for example, from a metallic coil spring or the like.

[0042] The upper end of the first elastic body 40 is attached to the central portion of the outer end portion 35 of each movable die 30 via a shaft-shaped attachment member 41. Specifically, the first elastic body 40 is attached by screwing a screw portion 41a of the attachment member 41 connected to the upper end of the first elastic body 40 into a screw hole 30a formed in the central portion of the outer end portion 35 side of each movable die 30. The lower end of the first elastic body 40 is attached to a support pin 42 which is fitted and fixed in a pin support hole 15 of the main body 10 .

[0043] In the initial state before the workpiece W is bent, this first elastic body 40 is arranged approximately vertically while being contained within the concave portion 14 of the main body 10 (see Figure 4 (a)), and is arranged so that as the workpiece W is bent, the upper side of the first elastic body 40 tilts so as to be exposed to the outside from the concave portion 14 of the main body 10.

[0044] As the punch P moves in the pressing direction to bend the workpiece W, the multiple movable dies 30 that make up each movable die unit 30A have their upper surfaces 31 rotate (swing) in opposite directions simultaneously around the upper edges 34a of each of the opposing end faces 34 of the pair of movable dies 30 against the biasing force of the first elastic body 40, thereby forming an approximately V-shape (see Figures 4(b) and 5(b)).

[0045] After the punch P bends the workpiece W, the pair of movable dies 30 constituting each movable die unit 30A returns to the initial state (initial position) in which the movement restricting surface 32 of the movable die 30 abuts against and is supported by the support surface 11 of the main body 10 due to the biasing force of the first elastic body 40 as the punch P moves in the counter-pressing direction. At this initial position, the upper surface of the movable die unit group 30B consisting of the multiple movable die units 30A forms a flat, continuous, flush workpiece receiving surface.

[0046] [Second elastic body] The second elastic body 60 is provided across the lower surface 23 (see FIG. 3(b)) of each support member 20 accommodated in the accommodation groove 12 of the main body 10 and the first step portion 13d (see FIG. 2(b)) of each through hole 13 formed in the main body 10, and is configured to urge each movable die 30 upward (see FIG. 5). The second elastic body 60 is formed, for example, of a metallic coil spring or the like, and is disposed within the first through portion 13a of each through hole 13 in a state in which it surrounds the body portion 52 of the support rod 50.

[0047] The second elastic body 60 biases the support member 20 so as to press it upward in the initial state before bending the workpiece W. In other words, the second elastic body 60 presses and moves the support member 20 upward until the head 51 of the support rod 50 provided on the lower surface 23 of the support member 20 abuts against the second step portion 13e of the through hole 13 formed in the main body 10 and further upward movement is restricted.

[0048] (Operation of bending device) Next, the operation of the bending apparatus 1 according to the embodiment of the present invention will be described. Fig. 4 is a schematic perspective view illustrating the state of bending a workpiece by the bending apparatus, Fig. 4(a) shows the state before bending, and Fig. 4(b) shows the state during bending. Fig. 5 is a schematic front view (partially in cross section) illustrating the state of bending a workpiece by the bending apparatus, Fig. 5(a) shows the state before bending, and Fig. 5(b) shows the state during bending.

[0049] <Placing the workpiece W on the bending device> As shown in FIG. 1, in the bending apparatus 1, in an initial state before bending a workpiece W, the upper surfaces of the movable dies 30 form a flat, continuous, flush mounting surface (workpiece receiving surface).

[0050] The workpiece W to be bent is placed at a predetermined position on this continuous, flush mounting surface (workpiece receiving surface). Fig. 4(a) shows an example in which the workpiece W is placed on three sets of movable die units 30A located in the longitudinal center of the main body 10. The workpiece W is not placed on two sets of movable die units 30A located at both ends of the main body 10. In other words, this is an example in which the workpiece W is placed on a part of the mounting surface of the bending apparatus 1 (three sets of movable die units 30A) and bent.

[0051] <Bending of workpiece W using bending equipment> After the workpiece W is placed on the placement surface (three sets of movable die units 30A) of the bending device 1, the punch P is moved in the pressing direction to bend the workpiece W. Note that the movement of the punch P in the pressing direction means that the punch P and the workpiece W placed on the placement surface move closer to each other, and includes a mode in which both the punch P and the main body 10 side are moved, and a mode in which either one of them is moved.

[0052] [Contact between workpiece W and punch P] When the punch P is moved in the pressing direction, the blade P1 of the punch P comes into contact with a fold line W1 (see FIG. 4(a)) of the workpiece W. This fold line W1 is located above the upper edges 34a (see FIG. 3(b)) of the opposing end faces 34 of the pair of movable dies 30 that constitute the movable die unit 30A.

[0053] [Movement of the movable die unit 30A with the workpiece W placed on it] When the punch P moves further in the pressing direction after the blade P1 of the punch P contacts the folding line W1 of the workpiece W, the three movable die units 30A on which the workpiece W is placed among the movable die unit group B are first moved. Specifically, with the pressing of the punch P, the convex arc surfaces 33 (see FIG. 3(b)) of the three movable die units 30A on which the workpiece W is placed start to rotate along the concave arc surfaces 21 of the support members 20. That is, the pair of movable dies 30 of each movable die unit 30A start to rotate (swing) in opposite directions with the upper edges 34a as the rotation fulcrums against the biasing force of the first elastic body 40.

[0054] Simultaneously with the rotational movement of each of the three sets of movable die units 30A, each support member 20 supporting each of the three sets of movable die units 30A moves (descends) in the pressing direction of the punch P against the inner surface 12a of the accommodating groove 12 formed in the main body 10, against the biasing force of the second elastic body 60.

[0055] [Abutment of the movable die unit 30A with no workpiece W placed thereon and the punch P] Furthermore, when the punch P moves in the pressing direction, the blade P1 of the punch P abuts against the movable die unit 30A on which the workpiece W is not placed. Specifically, the blade P1 of the punch P abuts against the two sets of movable die units 30A located at both ends of the main body 10. At this point, the two sets of movable die units 30A on which the workpiece W is not placed form a flat, flush workpiece receiving surface. On the other hand, the three sets of movable die units 30A on which the workpiece W is placed are in a state in which the pair of movable dies 30 are rotated in opposite directions and the upper edge 34a of each movable die 30 is lowered by the thickness of the workpiece W.

[0056] [Movement of the movable die unit 30A without the workpiece W placed thereon] When the punch P further moves in the pressing direction, the two movable die units 30A on which the workpiece W is not placed start to move. Specifically, as the punch P presses, the convex arc surfaces 33 (see FIG. 3(b)) of the two movable die units 30A on which the workpiece W is not placed start to rotate along the concave arc surfaces 21 of the support members 20. That is, the pair of movable dies 30 of each movable die unit 30A start to rotate (swing) in opposite directions with their upper edges 34a as the rotation fulcrums against the biasing force of the first elastic body 40. In addition, due to the movement of the punch P in the pressing direction, the three movable die units 30A on which the workpiece W is placed also continue to move (rotate), and the bending process of the workpiece W continues.

[0057] [The entire movable die unit group 30B is movable] In this way, the three sets of movable die units 30A on which the workpiece W is placed and the two sets of movable die units 30A on which the workpiece W is not placed each begin to move independently, and rotate in conjunction with the movement of the punch P in the pressing direction until the workpiece W is in a predetermined folded state (e.g., a V shape).

[0058] Thereafter, when the workpiece W reaches a predetermined bent state, the movement of the punch P in the pressing direction stops. In this state, the three movable die units 30A on which the workpiece W is placed are moved further by the thickness of the workpiece W than the two movable die units 30A on which the workpiece W is not placed. In other words, the angle formed by the upper surfaces 32 of the movable dies 30 of the three movable die units 30A on which the workpiece W is placed is smaller than the angle formed by the upper surfaces 32 of the movable dies 30 of the two movable die units 30A on which the workpiece W is not placed.

[0059] [Operation after bending workpiece W] After bending the work W to a predetermined bending angle, the punch P is moved so as to be relatively separated from the work W. In each movable die unit 30A, the pair of movable dies 30 constituting each movable die unit 30A rotate (swing) in opposite directions about the upper edge 34a of each opposing end face 34 serving as a rotation fulcrum due to the biasing force of the first elastic body 40, and the upper face 31 of each movable die 30 returns from the inclined position to the horizontal position. At the same time, the biasing force of the second elastic body 60 returns (rises) the support member 20 in the moving direction of the punch P relative to the main body 10.

[0060] That is, each movable die 30 rotates until the movement restricting surface 32 of each movable die 30 abuts against and is supported by the support surface 11 of the main body 10. Also, the support member 20 supporting each movable die 30 rises until the head 51 of the support rod 50 provided on the lower surface 23 of the support member 20 abuts against the second step portion 13e of the through hole 13 formed in the main body 10. Therefore, the upper surface 31 of each of the movable dies 30 constituting the movable die unit group 30B returns to the initial state before bending the workpiece W, forming a flat, continuous, uniform workpiece receiving surface. Thereafter, the above-mentioned operation is repeated to bend the next workpiece W.

[0061] In the above embodiment, the workpiece W is placed on the three movable die units 30A located in the center of the longitudinal direction of the main body 10 and bent, but the present invention is not limited to this example. The number of movable die units 30A on which the workpiece W is placed and the position on which the workpiece W is placed can be set arbitrarily. It is also possible to place a workpiece on all the movable die units 30A of the movable die unit group 30B and perform bending processing on the workpiece. In this case, all the movable die units 30A are moved simultaneously and in the same manner.

[0062] As described above, each movable die unit 30A that constitutes the movable die unit group 30B is configured to be able to move independently in response to the pressure of the punch P. For example, among the mounting surfaces of the movable die unit group 30B, the movable die unit 30A on which the workpiece W is placed and the movable die unit 30A on which the workpiece W is not placed will, as the punch P is pressed, first begin to rotate and move downward due to the pressing force via the workpiece W, and then the movable die unit 30A on which the workpiece W is not placed, which is in contact with the blade portion P1 of the punch P, will begin to rotate and move downward.

[0063] In this way, in each movable die 30, a greater press pressure acts through the workpiece W on the portion on which the workpiece W is placed, compared to the portion on which the workpiece is not placed. However, even when such a greater press pressure acts, the movable die unit 30A on which the workpiece W is placed and the movable die unit 30A on which no workpiece is placed can move independently, so even if such bending processing is performed continuously, no warping occurs in the portion on which the workpiece is not placed. Therefore, the bending device according to the present invention is highly durable and can perform stable bending without generating any warping on the mounting surface even over a long period of use.

[0064] In addition, in this embodiment, each movable die unit 30A is movably supported on its respective support member 20, and therefore the pair of movable dies 30 constituting each movable die unit 30A rotate (swing) in opposite directions with the upper edges 34a of each opposing end face 34, which serve as the rotation fulcrum, abutting each other. Therefore, during press processing, the upper edges 34a of each of the pair of movable dies 30 maintain abutment and rotate, so that they do not separate, uniformly supporting the underside of the bending portion of the workpiece W and improving the bending accuracy of the workpiece W.

[0065] In this embodiment, the pair of movable dies 30 constituting each movable die unit 30A are biased by a first elastic body 40, and each support member 20 supporting each movable die unit 30A is biased by a second elastic body 60. Therefore, as the punch P is pressed and released, each movable die 30 and each support member 20 can be moved smoothly, so that bending of the workpiece W can be performed repeatedly at high speed, thereby improving the processing speed.

[0066] (Other variations) The bending apparatus 1 described above is configured to support each of the movable die units 30A constituting the movable die unit group 30B by each of the vertically movable support members 20, but is not limited to this example. For example, instead of the configuration in which each of the movable die units 30A is supported by each of the vertically movable support members 20 described above, each of the movable die units 30A can be supported by another support structure.

[0067] In this case, for example, a support portion (support member) for supporting each of the movable die units 30A constituting the movable die unit group 30B may be formed on the upper portion of the main body 10, and each of the movable die units 30A may be rotatably supported on the support portion (support member). Specifically, a concave arc surface similar to the concave arc surface 21 of the support member 20 described above may be continuously formed in the longitudinal direction on the upper portion of the main body 10, and the convex arc surface 33 of each of the movable die units 30A may be supported on the concave arc surface. Also, each of the movable die units 30A may be provided with a first elastic body 40 that rotates in a direction opposite to the rotation direction associated with bending the workpiece W by the punch P and returns to its original position, as in the bending apparatus 1 described above.

[0068] Even in such a modified example, each movable die unit 30A that constitutes the movable die unit group 30B is configured to be able to move independently in response to the pressure of the punch P. For example, among the mounting surfaces of the movable die unit group 30B, the movable die unit 30A on which the workpiece W is placed and the movable die unit 30A on which the workpiece W is not placed will, as the punch P is pressed, first begin to rotate and move downward due to the pressing force via the workpiece W, and then the movable die unit 30A on which the workpiece W is not placed, which is in contact with the blade portion P1 of the punch P, will begin to rotate and move downward.

[0069] Therefore, even if a greater press pressure is applied through the workpiece W to the portion of each movable die 30 on which the workpiece W is placed compared to the portion on which the workpiece is not placed, the movable die unit 30A on which the workpiece W is placed and the movable die unit 30A on which no workpiece is placed can move independently, so even if such bending processing is performed continuously, no warping will occur in the portion on which the workpiece is not placed.

[0070] Furthermore, the present invention is not limited to the specific configurations described above, and can be modified as appropriate without departing from the spirit and scope of the present invention.

[0071] <Summary> As described above, the above embodiments disclose the following inventions. (1) A bending apparatus comprising a punch for pressing a workpiece, a main body forming a base, and a plurality of movable dies for supporting the workpiece, wherein the plurality of movable dies are configured as a movable die unit consisting of a pair of movable dies arranged opposite to each other in the short direction of the main body and rotating in opposite directions in response to pressing by the punch, the movable die units are arranged adjacent to each other along the longitudinal direction of the main body to form a movable die unit group that forms a mounting surface capable of supporting the workpiece, and the plurality of movable die units that constitute the movable die unit group are configured to be independently movable in response to pressing by the punch. (2) The bending apparatus described in (1) above, characterized in that the main body has a support member that supports the multiple movable die units from below, the support member has a concave arc surface that is concave downward, and the pair of movable dies that constitute the movable die unit each have a convex arc surface that rotatably slides against the concave arc surface of the support member. (3) The bending apparatus described in (2) above, characterized in that the support member is composed of a plurality of support members arranged adjacent to each other in the longitudinal direction of the main body, the plurality of support members are each supported independently so as to be movable up and down relative to the main body, and the plurality of movable die units are supported by each of the plurality of support members. (4) The bending device described in (3) above, characterized in that the main body has a storage groove that stores and supports the multiple support members so that they can move up and down, and the multiple support members are configured to be able to move independently in the vertical direction while being guided in a state of contact with the inner surface of the storage groove as the punch is pressed. (5) A bending processing device as described in (4) above, characterized in that a plurality of through holes penetrating vertically are provided at a predetermined interval on the bottom surface of the storage groove, and support rods provided on the undersides of each of the plurality of support members are supported and guided movably in the vertical direction by the plurality of through holes. [Explanation of symbols]

[0072] 1: Bending device 10: Main unit 12: Storage groove 13:Through hole 20: Support member 21: Concave arc surface 30: Movable die 30A: Movable die unit 30B: Movable die unit group 33: Convex arc surface 50: Support rod P: Punch

Claims

1. A punch that presses the workpiece; The main body forms the base, A plurality of movable dies supporting the workpiece; A bending apparatus comprising: The plurality of movable dies are configured as a pair of movable dies arranged opposite to each other in a short side direction of the main body and rotate in opposite directions in response to the pressing of the punch, and the pair of movable dies is configured as a movable die unit; The movable die units are arranged adjacent to each other along the longitudinal direction of the main body to form a movable die unit group that forms a mounting surface capable of supporting the workpiece, The plurality of movable die units constituting the movable die unit group are configured to be independently movable in response to the pressing force of the punch. A bending apparatus characterized by the above.

2. The main body has a support member that supports the plurality of movable die units from below, The support member has a concave arcuate surface that is concave downward, The pair of movable dies constituting the movable die unit each have a convex arcuate surface that is in sliding contact with the concave arcuate surface of the support member so as to be rotatable.

2. The bending apparatus according to claim 1 .

3. The support member includes a plurality of support members arranged adjacent to each other in the longitudinal direction of the main body, The plurality of support members are supported so as to be independently movable up and down relative to the main body, The plurality of movable die units are supported by the plurality of support members, respectively.

3. The bending apparatus according to claim 2,

4. The main body has an accommodation groove that accommodates and supports the plurality of support members so as to be movable up and down, The plurality of support members are configured to be movable in the vertical direction while being independently guided in contact with the inner surface of the accommodation groove as the punch is pressed.

4. The bending apparatus according to claim 3.

5. A plurality of through holes are provided at a predetermined interval on the bottom surface of the accommodation groove, the through holes penetrating vertically, In the plurality of through holes, a support rod provided on the lower surface of each of the plurality of support members is supported and guided so as to be movable in the vertical direction.

5. The bending apparatus according to claim 4.

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