JP4083162B2 - Bending machine - Google Patents

Description

  The present invention relates to a bending machine that can bend a plate into an L shape or a U shape.

  Conventionally, as a device for bending a plate-shaped workpiece into an L shape or a U shape, there is a press device shown in FIG. 10 or a press brake shown in FIG. 10A is a cross-sectional view showing a state before pressing, FIG. 10B is a cross-sectional view during pressing, and FIG. 10C is a cross-sectional view after pressing. 11 (a) is a cross-sectional view before pressing, (b) is a cross-sectional view during the first press, (c) is a cross-sectional view before pressing after the positioning change, and (d) is during the second press. It is sectional drawing.

  In the press apparatus of FIG. 10, when the plate-like workpiece 103 is placed on the die 101 as shown in FIG. 10A and the punch 105 is pressed and moved relative to the die 101 as shown in FIG. Is moved into the die 101 with the movement of. When the punch 105 ascends as shown in (c), the work 103 bent in a U-shape is raised by the rise of the pad 107. In this way, the workpiece 103 can be bent into a U-shaped cross section by the die 101 and the punch 105.

  In the press brake shown in FIG. 11, the work 113 is set on the bevel 109 as shown in FIG. 11A, the punch 111 is lowered as shown in FIG. 11B, and the work 113 is placed between the punch 111 and the bevel 109 for the first time. The one side is bent into an L shape. Next, as shown in (c), the position of the work 113 is changed and set with respect to the bevel 109, and the punch 111 is lowered as shown in (d), and the second press work is performed on the work 113 between the punch 111 and the bevel 109. I do. The workpiece 113 can be bent into a U-shape by the two presses.

  However, in the case of the press apparatus of FIG. 10, when there are many kinds of required bending widths W of the workpiece 103, a necessary number of molds set to the required bending width W are prepared or the molds are adjusted. Therefore, there is a problem that the bending width W has to be set.

  Therefore, when preparing a mold for each bending width W, there is a problem that a large investment is required, and a large amount of resources are required to prepare various types of molds. In addition, since press set work, that is, preparation work is required for each die, there is a problem that work time is increased. When adjusting a metal mold | die, adjustment is required for every bending width W, and there exists a problem that an operation | work is complicated.

  On the other hand, in the case of using the press brake shown in FIG. 11, even if there are many types of bending widths W, the die can be of one type because it is bent one by one. However, as shown in FIG. 11B, since the workpiece 113 is bent in a V-bending state, there is a problem that the posture of the workpiece 113 is easily collapsed after the processing, and it is difficult to automate the positioning operation.

Japanese Patent Laid-Open No. 7-80550 JP 2003-191019 A

  The problem to be solved is that, when there are many kinds of bending widths, the cost and the operation are likely to increase, and the automation of the positioning operation is difficult.

In the present invention, in order to easily cope with various types of bending widths, a work clamp capable of clamping a plate-like workpiece, and one side and the other side of the workpiece clamp are positioned close to the workpiece. And a pair of bending dies movable in the shearing direction. The bending dies are provided on a table, arranged on one side with the work clamp interposed therebetween, and the work on the table can be pressed and moved toward the other side. A pusher is provided, arranged on the other side across the workpiece clamp, and a workpiece moving from the one side is brought into contact with the workpiece clamp so as to be positioned relative to the workpiece clamp and supported so as to be movable forward and backward. the positioning portion is provided, wherein with determined position relative to the workpiece clamped by the said pusher is pressed and moved toward the workpiece on the table to the other side the positioning unit The table bending tool of the one side from the one surface of the edge portion protruding bending tool side of the one side subjected to clamp in a state where the edge should bend of over click is projected on the bending tool side of the one side To move the positioning portion toward the one side to position the workpiece with respect to the workpiece clamp and to move the edge to be bent to the other bending die side. the most important feature that the other side of the bending tool from one face side of performs the clamp in the state of being projected the other side of the bending tool projecting side edges are moved together with the table folding the edges To do.

A bending machine according to the present invention includes a work clamp capable of clamping a plate-shaped work, and a pair of bending dies that are located close to one side and the other side of the work clamp and are movable in a shearing direction with respect to the work. The bending mold is provided on a table, arranged on one side with the work clamp in between, a pusher capable of pressing and moving the work on the table toward the other side, and the work clamp in between is disposed on the other side, the provided positioning portion that is forward and backward movably supported with respect to the one side with abut the workpiece to be moved from one side determined position relative to the workpiece clamping, on the table by the pusher the edges should bend of the workpiece together with the workpiece is pressed and moved toward the to the other side determines the position relative to the workpiece clamped by the positioning portion one Folding the edge portion of the bending die side protrudes caused said one side of the bending tool from one face side of the edge portion protruding bending tool side of the one side performs the clamped state is moved together with the table, the the other performs the clamp in a state where the edge should bending of the workpiece is projected on the bending tool side of the other side with the positioning unit is moved toward the one side position the said workpiece to said workpiece clamping When the workpiece is bent in a U-shape, the bending mold on the other side is moved together with the table from one side of the edge protruding to the side of the bending mold, so that there are many kinds of bending widths. However, it is possible to easily cope with this, and it is possible to suppress the increase in cost and the amount of work.

  In addition, since the workpiece is clamped and bent, the posture of the workpiece after bending is stabilized, and automation of the positioning operation is easy.

  When the work clamp and the bending die are provided with flank surfaces that escape the contact of the workpiece during bending by movement of the bending die, the workpiece can be bent accurately.

  When the bending die is moved by the eccentric cam mechanism, the bending die can be reliably moved and bent.

  The purpose of easily adapting to various bending widths and stabilizing the posture after bending is realized by the work clamp and bending mold.

  1 and 2 show a bending machine according to a first embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a front view in the direction of arrow SA in FIG. 1, and FIG. 3 is SB-SB in FIG. It is a schematic block diagram of an arrow direction.

  As shown in FIGS. 1, 2, and 3, the bending machine 1 includes a work clamp 3 and bending dies 5 and 7.

  The workpiece clamp 3 can clamp a plate-shaped workpiece 9. The work clamp 3 includes a lower clamp mold 11 and an upper clamp mold 13. The lower clamp mold 11 is fixed to the machine frame 15 side. The upper clamp mold 13 is disposed above the lower clamp mold 11.

  The upper clamp mold 13 is attached to a lifting frame 17. The raising / lowering frame 17 is supported by the upper holding frame 27 side so that raising / lowering is possible. The elevating frame 17 is coupled to the tip of the swing arm 19. The swing arm 19 is supported by the swing shaft 21. The swing shaft 21 is rotatably supported by the shaft support portion 23 on the machine base frame 15 side. The oscillating shaft 21 is interlocked with the upper presser cylinder 25. The upper pressing cylinder 25 is attached to the upper pressing frame 27. By rotating the swinging shaft 21 by the upper pressing cylinder 25, the lifting frame 17 can be linearly driven up and down via the swinging arm 19. By this raising / lowering drive of the raising / lowering frame 17, the clamp upper mold | type 13 raises / lowers with respect to the clamp lower mold | type 11, and the workpiece | work 9 can be clamped between the clamp upper mold | type 13 and the clamp lower mold | type 11 in the downward position of the clamp upper mold | type 13. Yes. The upper holding frame 27 is formed in a gate shape and is provided on the machine base frame 15.

  The bending dies 5 and 7 are provided on the table 10, are located close to both sides of the work clamp 3, and can move in a shearing direction with respect to the work 9.

  The drive structure of the bending dies 5 and 7 will be described with reference to FIGS. 4 is a schematic diagram of the main part in the SC arrow direction of FIG. 3, FIG. 5 is a schematic diagram of the main part of the SD arrow direction in FIG. 3, and FIGS. 6 and 7 are schematic diagrams in the SE arrow direction of FIG. FIG.

  As shown in FIGS. 1 to 7, the bending dies 5 and 7 are configured to move by eccentric cam mechanisms 29 and 31. The eccentric cam mechanisms 29 and 31 have a substantially symmetrical structure. The eccentric cam mechanisms 29 and 31 are supported by a common upper fulcrum shaft 33 and lower fulcrum shaft 35. The upper fulcrum shaft 33 and the lower fulcrum shaft 35 are rotatably supported by shaft support frames 37 and 39 fixed to the machine base frame 15. Eccentric cams 41 and 43 are eccentrically attached to the upper fulcrum shaft 33 and the lower fulcrum shaft 35. Synchronization brackets 45 and 47 are respectively attached to the upper fulcrum shaft 33 and the lower fulcrum shaft 35, and synchronization plates 49 and 51 are connected between the synchronization brackets 45 and 47.

  The upper fulcrum shaft 33 is coupled to one end side of the bending die cylinders 53 and 55, and the other end side of the bending die cylinders 53 and 55 is supported on the machine frame 15 side.

  Interlocking plates 57 and 59 are fitted to the eccentric cams 41 and 43, and the bending dies 5 and 7 are coupled to upper ends of the interlocking plates 57 and 59. Accordingly, when the upper fulcrum shaft 33 is rotationally driven by the expansion and contraction operations of the bending cylinders 53 and 55 as shown in FIGS. 6 and 7, the lower bracket shaft 53, the synchronization plates 49 and 51, and the synchronization bracket 47 are moved downward. The fulcrum shaft 35 is also rotationally driven in synchronization.

  By the rotational drive of the upper fulcrum shaft 33 and the lower fulcrum shaft 35, the eccentric cams 41 and 43 are eccentrically rotated in synchronization. By the eccentric rotation of the eccentric cams 41 and 43, the interlocking plates 57 and 59 move up and down, and the bending dies 5 and 7 can be moved up and down. By this raising and lowering operation, the bending dies 5 and 7 can move upward in the shearing direction with respect to the work 9 from the position shown in FIG. 6, for example, and can return to the position shown in FIG.

  As shown in FIGS. 1, 2, and 3, a positioning device 61 is provided on one side of the work clamp 3. The positioning device 61 includes a positioning portion 63 that is supported so as to be movable forward and backward and movable up and down. The positioning unit 63 is attached to the tip of the positioning arm 65. The positioning arm 65 is rotatably supported by the positioning movable frame 67. The positioning arm 65 is provided with an interlocking arm 69. The interlocking arm 69 is connected to the lifting cylinder 71. The lifting cylinder 71 is supported by the positioning frame 73. The positioning frame 73 is fixed to the upper pressing frame 27 side.

  The positioning movable frame 67 is integrally attached to the ball nut 75. The ball nut 75 is screwed into the ball screw 77. The ball screw 77 is axially supported by the positioning frame 73. The ball screw 77 is linked to the servo motor 79.

  Therefore, when a driving force is applied to the interlocking arm 69 by driving the lifting cylinder 71, the positioning arm 65 integral with the interlocking arm 69 rotates with respect to the positioning movable frame 67, and the positioning portion 63 side can be moved up and down. When the ball screw 77 is rotationally driven by the servo motor 79, the ball nut 75 moves along the ball screw 77. By this movement, the positioning arm 65 and the positioning portion 63 can move forward and backward with respect to the work clamp 3 via the positioning movable frame 67 integral with the ball nut 75.

  A pusher 81 is provided on the opposite side of the positioning device 61 across the work clamp 3. The pusher 81 includes a pusher portion 83, and the pusher portion 83 is supported by a pusher frame 85. Both ends of the pusher frame 85 are supported by actuators 87 and 89, and can be moved forward and backward on the table 10 with respect to the work clamp 3 by driving the actuators 87 and 89.

  A conveyor 91 is provided on the table 10 so as to cooperate with the operation of the pusher 81. The conveyor 91 is composed of a chain or the like. A work stock portion 93 is disposed on the start end side of the conveyor 91. A large number of workpieces 9 are stocked in the workpiece stock section 93 in a stacked state. A transport device 95 using a magnet is provided on the work stock unit 9.

  Therefore, the work 9 of the work stock unit 93 is attracted by the magnetic force by the transfer device 95 and transferred in the direction of arrow A, so that it can be transferred and supplied to the start end side of the conveyor 91.

  A workpiece carry-out device 97 is provided adjacent to the positioning device 61. The workpiece carry-out device 97 is arranged with respect to the table 10 with a workpiece 99 interposed therebetween. The work carry-out device 97 is supported by the carry-out frame 101 so that the carry-out shaft 103 can move forward and backward in the axial direction. An end portion of the carry-out shaft 103 is connected to a chain 107 via a bracket 105. The chain 107 is driven by a carry-out motor 109.

  Accordingly, when the chain 107 is driven by the carry-out motor 109, the carry-out shaft 103 moves in the axial direction in conjunction with the chain 107, and can move forward and backward with respect to the work clamp 3 side.

  Next, an outline of the overall operation will be described.

  When the workpiece 9 is transferred to the starting end side of the conveyor 91 by the conveying device 95, the workpiece 9 is transferred to the workpiece clamp 3 side by the operation of the conveyor 91. The pusher frame 81 of the pusher 81 is positioned on the operation start end side 85A with respect to the transferred work 9. In this state, the pusher portion 83 is lowered so as to face the end surface of the work 9. Next, as the pusher frame 85 is moved, the pusher 83 presses the end of the work 9, and the work 9 is moved between the work clamp lower mold 11 and the work clamp upper mold 13 of the work clamp 3. At this time, the positioning part 63 is positioned at a predetermined position on the opposite side of the work clamp 3, and the work 9 moving by the pressing force of the pusher part 83 is abutted against the positioning part 63 and positioned. The mold 11 and the upper clamp mold 13 are set correctly.

  Next, the workpiece 9 is bent in a U-shape as will be described later by selective operation of the bending dies 5, 7 and the like.

  After the U-shaped bending of the workpiece 9, the positioning portion 63 of the positioning device 61 moves backward and rises with respect to the workpiece clamp 3, and the unloading shaft 103 of the workpiece unloading device 97 moves forward with respect to the workpiece clamp 3. By this advancement operation, the magnet at the tip of the unloading shaft 103 attracts the U-bent work 9A, and the U-shaped bent work 9A is unloaded to the work chute 99 by retreating the unloading shaft 103 in this state.

  FIG. 8 is an enlarged view of a main part showing the relationship between the work clamp 3 and the bending dies 5 and 7. As shown in FIG. 8, the lower clamp mold 11 and the upper clamp mold 13 have flat clamp surfaces 111 and 113. Both edges 115 and 117 of the clamp surface 111 and both edges 119 and 121 of the clamp surface 113 are formed with rounded shapes.

  The clamp upper die 13 is provided with relief surfaces 123 and 125 inclined inward on the upper sides of both edges 119 and 121. The flank surfaces 123 and 125 escape the contact of the workpiece when the workpiece 9 is bent by the movement of the bending dies 5 and 7.

  Edge portions 127 and 129 of the bending dies 5 and 7 are also formed with rounded shapes. Relief surfaces 131 and 133 are inclined and formed below the edge portions 127 and 129 of the bending dies 5 and 7. The flank surfaces 131 and 133 are inclined corresponding to the flank surfaces 123 and 125 of the upper clamp 13, and the flank surfaces 131 and 133 are slightly inclined more than the flank surfaces 123 and 125. It has become.

  Accordingly, the workpiece 9 clamped between the clamp surfaces 111 and 113 of the lower clamp 11 and the upper clamp 13 is clamped in a state in which the edge to be bent protrudes, for example, to the bending die 5 side. The front die 5 is moved upward from one side of the part, that is, the lower surface side, and the edge of the workpiece 9 is bent at a substantially right angle by the cooperation of the edge 127 of the bending die 5 and the edge 119 of the clamp upper die 13. it can. The same applies to the bending die 7 side.

  When both edge portions of the workpiece 9 are bent by the flank surfaces 123, 125, 131, and 133, the edge portions in the middle of bending can be released to the flank surfaces 123 and 125 side. For this reason, the edge part of the workpiece 9 can be accurately bent at a right angle in consideration of the springback due to the elasticity of the workpiece 9.

  FIG. 9 shows the bending process, and FIGS. 9A to 9H are process diagrams showing the first process to the completion of the 8th process.

  In (a), the positioning unit 63 of the positioning device 61 is positioned and set on the table 10 at a predetermined position. The clamp upper die 13 is in the raised position, and the workpiece 9 is pressed and moved by the pusher 81 as described above. By this pressing movement, the workpiece 9 is supplied between the lower clamp mold 11 and the upper clamp mold 13 and is positioned by contacting the positioning portion 63. The upper clamp 13 is lowered, and the workpiece 9 is clamped between the lower clamp 11 and the upper clamp 13 as shown in FIG. At this time, the edge portion of the work 9 to be bent is in a state of protruding on the bending die 5 side, that is, on the bending die 5.

  Next, when the bending die 5 is moved from the lower surface which is one surface side of the edge 135 of the workpiece 9, the edge 135 is squeezed between the corner 119 of the clamp upper die 13 and the corner 127 of the bending die 5, It is bent upward as shown in (c).

  Next, as shown in (d), the clamp upper die 13 is driven up, and the positioning device 61 moves forward in the direction of the work clamp 3 by driving the positioning device 61, and the work 9 is reset with respect to the work clamp 3.

  Next, as shown in (f), the upper clamp mold 13 is driven downward, and the workpiece 9 is clamped again between the lower clamp mold 11 and the upper clamp mold 13. At this time, the other edge portion 137 of the work 9 to be bent is in a state of protruding on the bending die 7 side, that is, on the bending die 7.

  Next, when the bending die 7 is driven, the edge portion 137 is bent substantially at a right angle as shown in FIG.

  Next, the clamp upper die 13 is raised, the workpiece 9 is clamped by the workpiece clamp 3, and the workpiece 9 is discharged to the workpiece chute 99 side as described above.

  Thus, even when there are many kinds of bending widths when the work 9 is bent in a U shape, it can be easily handled by the cooperation of the work clamp 3, the pusher 81, the positioning device 61, and the bending dies 5 and 7. . For this reason, it is not necessary to prepare many types of molds, and the problem of requiring a lot of resources can be improved. Further, since the press setting work for each mold, that is, the preparation work is not required, the working time can be shortened. There is no need to adjust the mold for each bending width of the work 9, and the work becomes easy. Therefore, an increase in cost and an increase in work amount can be significantly suppressed.

  Further, since the workpiece 9 is clamped and bent, the posture of the workpiece 9 after the bending process is stabilized, and automation of the positioning operation is easy.

  Since the work clamp 3 and the bending dies 5 and 7 are provided with the flank surfaces 123, 125, 131 and 133, the work 9 can be accurately bent.

  A movable positioning device 61 is provided on one side of the workpiece clamp 3 for positioning the workpiece 9 against the workpiece 9, a pair of bending dies 5 and 7 are provided on both sides of the workpiece clamp 3, and the workpiece is mounted on the positioning device 61. 9, the one edge 135 to be bent of the work 9 clamped by the work clamp 3 is projected to the bending die 5 side, and the one edge 135 is bent. In order to project the other edge 137 of the workpiece 9 to be bent toward the other bending die 7 by the movement of the positioning device 61, the positioning of the workpiece 9 is facilitated by the positioning device 61, and both side edges of the workpiece 9 are The parts 135 and 137 can be easily bent.

  Since the bending dies 5 and 7 are moved by the eccentric cam mechanisms 29 and 31, the bending dies 5 and 7 can be reliably moved and bent.

  The shapes of the bending dies 5 and 7 are not particularly limited, and may be other than a plate shape.

It is a top view of a bending machine (Example 1). (Example 1) which is a front view of the SA arrow direction of FIG. (Example 1) which is a schematic block diagram of the SB-SB arrow direction of FIG. FIG. 4 is a schematic configuration diagram in the SC arrow direction of FIG. 3 (Example 1). FIG. 4 is a schematic configuration diagram in the SD arrow direction of FIG. 3 (Example 1). FIG. 4 is a schematic configuration diagram in the direction of an arrow SE in FIG. 3 (Example 1). 3 is a schematic configuration in the direction of the arrow SE in FIG. 3 (Example 1). (Example 1) which is an expansion schematic sectional drawing of a work clamp and its periphery. The bending process is shown. (A) is the first process, (b) is the second process, (c) is the third process, (d) is the fourth process, (e) is the fifth process, and (f) is the second process. 6 steps and (g) are step diagrams showing the 7th step (Example 1). (A) is a process before pressing, (b) is a process during pressing, and (c) is a process diagram showing a process after pressing (conventional example). (A) is a process before pressing, (b) is a process during pressing, (c) is a process for resetting a workpiece, and (d) is a process diagram showing a process during a second press (conventional example).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bending machine 3 Work clamp 5,7 Bending die 9 Work 61 Positioning device 29,31 Eccentric cam mechanism 135,137 Edge part

Claims (3)

A work clamp that can clamp plate-like work;
A pair of bending dies positioned close to one side and the other side of the workpiece clamp and movable in a shearing direction with respect to the workpiece;
The bending mold is provided on a table,
A pusher that is arranged on one side with the work clamp in between, and is capable of pressing and moving the work on the table to the other side;
A positioning portion disposed on the other side across the work clamp, positioned so as to contact the work moving from the one side and positioned with respect to the work clamp and supported so as to be movable back and forth with respect to the one side;
A state in which the work on the table is pressed and moved to the other side by the pusher, the positioning part is positioned with respect to the work clamp, and an edge to be bent of the work is protruded to the one bending mold side The clamp is performed and the one-side bending die is moved together with the table from one side of the edge protruding to the one-side bending die side, the edge is bent, and the positioning portion is directed toward the one side. edge projecting edges to bend of said workpiece bending tool side of the other side performs the clamp in a state of protruding to the bending tool side of the other side with the moved position the said workpiece to said workpiece clamping Moving the bending mold on the other side together with the table from one side of the part to bend the edge,
Bending machine characterized by that. The bending machine according to claim 1,
A bending machine characterized in that the work clamp and the bending die are provided with a flank for escaping the contact of the workpiece during bending by movement of the bending die. The bending machine according to claim 1 or 2,
The bending machine moves by an eccentric cam mechanism .

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