JP2022166825A - Bending system, and split die arrangement method - Google Patents

Abstract

To suppress generation of interruption of a drawing operation.SOLUTION: A drawing operation includes: a restraining operation of advancing a lower die holding member 64L on a left side and restraining a reference lower die 14a with a lower die holding member 64L on a left side; an insertion operation of advancing a lower die holding member 64R on a right side and inserting a lower holding member 64R on a right side into an insertion hole of an object lower die 14h; and an execution operation of moving the right and left lower die holding members 64L and 64R in a lateral direction so that the members approach each other, and gathering lower dies 14a to 14h from the reference lower die 14a to the object lower die 14h. When determining that the insertion operation fails, a control device 100 performs a retry operation of retreating the lower die holding member 64L on the left side and releasing the restraining operation, then advancing the lower die holding member 64R on the right side again, and inserting the lower holding member 64R into the insertion hole 141 of the object lower die 14h.SELECTED DRAWING: Figure 6D

Description

The present invention relates to a bending system and a method of arranging split dies.

A bending system includes a press brake that bends a workpiece, and the press brake has a table and a die holder that is provided on the table and holds a die. The bending system also includes a die rack that is disposed to the side of the press brake and stores a plurality of dies. The mold rack has a plurality of stockers holding molds, and any selected stocker can be positioned at a replacement position for mold replacement. Further, the bending system includes left and right die changing units for transferring the die between the die holder and the stocker positioned at the exchanging position and placing the die at the desired position in the die holder. . Each mold exchange unit has a mold holding member that can be inserted into and removed from an insertion hole provided in the mold (see Patent Document 1).

Japanese Patent No. 5947861

By the way, when arranging a mold stage in which a plurality of molds are combined in a mold holder, an operation is performed to bring the molds together so that there is no gap between the molds. This gathering operation is performed by inserting the mold holding member into the insertion hole of the mold. If it is determined that the insertion operation of inserting the mold holding member into the insertion hole has failed, an alarm is generated and the gathering operation is interrupted. There is the inconvenience of doing so.

A bending system according to one aspect of the present invention includes a press brake in which a plurality of dies are arranged in the left-right direction on a die holder provided on a table, and a metal mold that advances and retreats in the front-rear direction. a first moving body and a second moving body having a mold holding member that can be inserted into and removed from an insertion hole provided in the mold, and that are provided on the rear surface side or the front surface side of the table so as to be movable in the left-right direction; and a control device that controls the first and second moving bodies to bring together the plurality of molds so that there is no gap between the molds. The moving operation is a restraining operation in which the first mold holding member of the first moving body is advanced and the reference mold located at one end of the plurality of molds is restrained by the first mold holding member. advances the second mold holding member of the second moving body to insert the second mold into the insertion hole of the target mold selected from the remaining molds excluding the reference mold among the plurality of molds; including an insertion operation of inserting the holding member, and an execution operation of moving the first and second moving bodies along the left-right direction so as to approach each other to gather the molds from the reference mold to the target mold. . When the control device determines that the insertion operation has failed, the controller retracts the first mold holding member to release the restraining operation, and then advances the second mold holding member again to insert the second mold into the insertion hole of the target mold. A retry operation for inserting the mold holding member is performed.

According to the bending system of one aspect of the present invention, when it is determined that the insertion operation has failed, the retry operation is performed. This retry operation is performed in a state in which the first mold holding member is retracted and the reference mold is released from restraint. By releasing the reference mold from restraint, the reference mold has room to slightly move, and the reference mold to the target mold can move slightly as a whole. As a result, in the retry operation, the second mold holding member can be easily inserted into the target mold. As a result, even if the insertion operation fails once, if the second mold holding member can be inserted into the target mold by a retry operation, the moving operation can be continued without generating an alarm.

According to one aspect of the present invention, it is possible to suppress the occurrence of interruption of the gathering operation.

FIG. 1 is a front view schematically showing the configuration of the bending system according to the first embodiment. 2 is a side view schematically showing the configuration of the bending system shown in FIG. 1. FIG. FIG. 3A is a diagram showing a part of the procedure of the gathering operation according to the first embodiment. FIG. 3B is a diagram illustrating a part of the procedure of the shifting operation according to the first embodiment; FIG. 3C is a diagram illustrating a part of the procedure of the shifting operation according to the first embodiment; FIG. 3D is a diagram illustrating a part of the procedure of the gathering operation according to the first embodiment; FIG. 4A is a diagram showing a part of the procedure of the shifting operation according to the first embodiment. FIG. 4B is a diagram illustrating a part of the procedure of the shifting operation according to the first embodiment; FIG. 4C is a diagram illustrating a part of the procedure of the shifting operation according to the first embodiment; FIG. 4D is a diagram illustrating part of the procedure of the shifting operation according to the first embodiment; FIG. 5A is a diagram showing the procedure of initial operation. FIG. 5B is a diagram showing the procedure of the initial operation. FIG. 5C is a diagram showing the procedure of the initial operation. FIG. 5D is a diagram showing the procedure of initial operation. FIG. 6A is a diagram showing the procedure of the first retry operation. FIG. 6B is a diagram showing the procedure of the first retry operation. FIG. 6C is a diagram showing the procedure of the first retry operation. FIG. 6D is a diagram showing the procedure of the first retry operation. FIG. 7A is a diagram showing the procedure of the second retry operation. FIG. 7B is a diagram showing the procedure of the second retry operation. FIG. 7C is a diagram showing the procedure of the second retry operation. FIG. 7D is a diagram showing the procedure of the second retry operation. FIG. 8A is a diagram showing a part of the procedure of the shifting operation according to the second embodiment. FIG. 8B is a diagram showing a part of the procedure of the shifting operation according to the second embodiment. FIG. 8C is a diagram showing a part of the procedure of the gathering operation according to the second embodiment. FIG. 8D is a diagram showing a part of the procedure of the gathering operation according to the second embodiment. FIG. 9A is a diagram showing a part of the procedure of the gathering operation according to the second embodiment. FIG. 9B is a diagram showing a part of the procedure of the gathering operation according to the second embodiment. FIG. 9C is a diagram showing a part of the procedure of the gathering operation according to the second embodiment. FIG. 9D is a diagram showing a part of the procedure of the gathering operation according to the second embodiment.

A bending system according to the present embodiment and a method of arranging split molds will be described below with reference to the drawings.

(First embodiment)
FIG. 1 is a front view schematically showing the configuration of the bending system according to the first embodiment. 2 is a side view schematically showing the configuration of the bending system shown in FIG. 1. FIG. A bending system 10 according to a first embodiment will be described with reference to FIGS. 1 and 2. FIG. In the following description, as definitions of directions, the left-right direction, the front-rear direction, and the up-down direction are defined, but these directions are used only for convenience of explanation. Of the left-right direction, the front-rear direction, and the up-down direction, the left-right direction and the front-rear direction correspond to two directions that are orthogonal to each other in the horizontal direction, and the up-down direction corresponds to the vertical direction.

The bending system 10 includes a lower die holder 30 provided on a lower table 24, a press brake 16 in which a plurality of lower dies 14 are arranged along the left-right direction, and a lower die holder 30 that advances and retreats along the front-rear direction. Left and right lower mold exchanging units 50L each having a lower mold holding member that can be inserted into and removed from an insertion hole 141 provided in the mold 14, and are provided on the rear surface side or the front surface side of the lower table 24 so as to be movable in the horizontal direction. , 50R, and a control device 100 that controls the left and right lower mold exchange units 50L and 50R, respectively, and brings together the plurality of lower molds 14 so that there is no gap between the lower molds 14.例文帳に追加In the shifting operation, the lower mold holding member 64L of the left lower mold exchanging unit 50L is advanced, and the reference lower mold 14 positioned at one end of the plurality of lower molds 14 is moved by the left lower mold holding member 64L. The target is selected from remaining lower dies 14 among the plurality of lower dies 14 excluding the reference lower dies 14 by performing a restraining action to restrict and advancing the lower die holding member 64R of the right lower die exchanging unit 50R. The insertion operation of inserting the lower mold holding member 64R into the insertion hole 141 of the lower mold 14, and the left and right lower mold exchange units 50L and 50R are moved along the left-right direction so as to approach each other, thereby moving from the reference lower mold 14 to the target lower mold. and a performing action of gathering the lower mold 14 up to the mold 14 . When the controller 100 determines that the insertion operation has failed, the control device 100 retracts the left lower mold holding member 64L to release the restraining operation of the reference lower mold 14, and then advances the right lower mold holding member 64R again to move the target lower mold holding member 64L forward. A retry operation for inserting the right lower mold holding member 64R into the insertion hole 141 of the lower mold 14 is performed. Of course, the above description relates to the shift operation by the left and right lower mold exchanging units 50L and 50R provided corresponding to the lower mold 14, but the left and right upper mold exchanging units provided corresponding to the upper mold 12 The same applies to the shift operation by the units 74L and 74R.

Details of the bending system 10 will be described below. The bending system 10 is a system for bending a plate-like workpiece W such as sheet metal. The bending system 10 includes a press brake 16 , left and right lower die changing units 50 L and 50 R, left and right upper die changing units 74 L and 74 R, and a control device 100 .

The press brake 16 bends the workpiece W through cooperation between an upper mold 12 such as a punch and a lower mold 14 such as a die.

The press brake 16 has a body frame 18 . The body frame 18 has left and right side plates 20 facing each other with a space therebetween in the left-right direction. A lower table 24 extending in the horizontal direction is provided on the lower portion of the body frame 18 , and an upper table 26 extending in the horizontal direction is provided on the upper portion of the body frame 18 . The upper table 26 is configured to be vertically movable. Above each side plate 20, a hydraulic cylinder 28 is provided as a vertical movement actuator for moving the upper table 26 in the vertical direction with respect to the body frame 18. As shown in FIG. Instead of configuring the upper table 26 to be vertically movable, the lower table 24 may be configured to be vertically movable. A servomotor may be used instead of the hydraulic cylinder 28 for the vertical movement actuator.

A lower die holder 30 that detachably holds the lower die 14 is provided above the lower table 24 . For example, the lower mold holders 30 are configured to extend continuously in the left-right direction, but may be configured to be intermittently provided along the left-right direction at appropriate intervals. A holder groove 30g for inserting a shank portion (base portion) 140 of the lower mold 14 is formed in the lower mold holder 30 along the left-right direction. The lower die holder 30 has a hydraulic clamp 32 that secures the lower die 14 to the lower table 24 .

An upper die holder 34 that detachably holds the upper die 12 is provided below the upper table 26 . For example, the upper mold holder 34 is configured to extend continuously in the left-right direction, but may be configured to be intermittently provided along the left-right direction at appropriate intervals. A holder groove 34g for inserting the shank portion (base portion) 120 of the upper mold 12 is formed in the upper mold holder 34 along the left-right direction. The upper die holder 34 has a hydraulic clamp 36 that secures the upper die 12 to the upper table 26 .

An insertion hole 141 is provided in the center portion of the lower mold 14 in the left-right direction (width direction) so as to pass therethrough along the front-rear direction. The position of the insertion hole 141 in the lower mold 14 attached to the lower mold holder 30 is specified as a position corresponding to half the width of the mold from the position of one of the left and right sides of the lower mold 14 as a reference. can do. Further, similarly to the lower mold 14, the upper mold 12 is also provided with an insertion hole 121 penetrating in the front-rear direction.

The bending system 10 is provided with a die rack 42 for storing a plurality of lower dies 14 and a plurality of upper dies 12 on the left-right side of the press brake, in this embodiment, on the right side.

The mold rack 42 has a plurality of lower stockers each holding one or more lower dies 14, and the plurality of lower stockers are arranged side by side in the front-rear direction. The plurality of lower stockers are configured to be movable in the vertical direction and the front-rear direction by a stocker moving mechanism. The stocker moving mechanism can select an arbitrary lower stocker from among the plurality of lower stockers and move the selected lower stocker in the vertical direction and the front-rear direction to position it at the lower mold replacement position. The replacement position for the lower mold is set at a position adjacent to the lower mold holder 30 in the left-right direction.

The mold rack 42 also has a plurality of upper stockers each holding one or more upper molds 12 . The configuration of each upper stocker is similar to that of the lower stocker.

The left and right lower mold exchange units 50L and 50R transfer the lower mold 14 between the lower mold holder 30 and the lower stocker positioned at the lower mold exchange position, arrange the lower mold 14 in the lower mold holder 30, and so on. conduct. The left and right lower mold exchanging units 50L and 50R correspond to first and second moving bodies provided corresponding to the lower mold 14. As shown in FIG.

The left and right lower mold exchanging units 50L and 50R are provided on the rear surface side of the lower table 24 . A lower guide 48 extending in the left-right direction is provided on the rear surface side of the lower die holder 30 . Each of the lower mold exchanging units 50L, 50R is configured to be movable in the left-right direction via the lower guide 48. As shown in FIG.

The left and right lower mold exchanging units 50L and 50R are configured independently of each other and can operate independently of each other. Since the configurations of the left and right lower mold replacing units 50L and 50R correspond to each other, the configuration will be described below using the right lower mold replacing unit 50R as an example.

The right lower mold exchanging unit 50R is moved in the left-right direction by being driven by a servomotor 52 as an actuator for left-right movement. The servomotor 52 has an encoder 54 as a position detector for detecting the lateral position of the lower mold exchanging unit 50R.

The right lower die exchange unit 50R includes a lower unit main body 56R provided on the lower guide 48 so as to be movable in the horizontal direction, and a lower support member 58R provided on the lower unit main body 56R so as to be movable in the front-rear direction and the vertical direction. have. The lower support member 58R is moved in the front-rear direction with respect to the lower unit main body 56R by driving the first air cylinder 60 as an actuator for front-rear movement. The lower support member 58R is vertically moved with respect to the lower unit main body 56R by driving the second air cylinder 62, which is an actuator for vertical movement.

The right lower mold exchanging unit 50R has a lower mold holding member 64R provided movably in the front-rear direction on the lower support member 58R. The lower mold holding member 64R is moved in the front-rear direction with respect to the lower support member 58R by driving the third air cylinder 66 as an actuator for front-rear movement. The lower die holding member 64R is configured to be insertable into the insertion hole 141 of the lower die 14 .

As described above, the left and right lower mold exchanging units 50L and 50R transfer and arrange the lower mold 14 in the lower mold holder 30, and the like. Each lower die exchange unit 50L, 50R advances the lower die holding members 64R, 64L to insert the lower die holding members 64R, 64L into the insertion holes 141 of the lower die 14, thereby holding the lower die 14. can be done.

With the lower mold holding members 64R and 64L holding the lower mold 14, the lower mold replacing units 50L and 50R move in the left and right direction, thereby moving the lower mold 14 in the left and right direction. By positioning the lower mold exchanging units 50</b>L and 50</b>R at predetermined positions, the lower mold 14 can be arranged at a desired position on the lower mold holder 30 .

The left and right lower mold exchanging units 50L and 50R can transfer and dispose the lower mold 14 independently of each other. In addition, the left and right lower mold exchanging units 50L and 50R respectively hold the lower molds 14 positioned at the left and right ends of the plurality of lower molds 14, thereby collectively transferring and arranging the plurality of lower molds 14. can also

When transferring and arranging the lower mold 14, there may be a sufficient gap on the left or right side of the lower mold 14 to be processed. In this case, the lower mold holding members 64R and 64L are brought into contact with one of the left and right side surfaces of the lower mold 14 without being inserted into the insertion holes 141, and the side surface is pushed in the left-right direction. , the lower mold 14 may be transferred.

The left and right upper mold exchanging units 74L and 74R perform transfer of the upper mold 12 between the upper mold holder 34 and the upper stocker positioned at the exchange position for the upper mold, arrangement of the upper mold 12 in the upper mold holder 34, and the like. conduct. The left and right upper mold exchanging units 74L and 74R correspond to first and second moving bodies provided corresponding to the upper mold 12 .

The configuration of the left and right upper mold replacement units 74L, 74R corresponds to the configuration of the left and right lower mold replacement units 50L, 50R described above. That is, the upper guide 72, the servo motor 76, the encoder 78, the upper unit body 80R (80L), the upper support member 82R (82L), the first air cylinder 84, and the second air cylinder 86 in the upper mold exchanging unit 74R (74L). , the upper mold holding member 88R (88L), and the third air cylinder 90 are the lower guide 48, the servo motor 52, the encoder 54, the lower unit main body 56R (56L), and the lower support member in the lower mold changing unit 50R (50L). 58R (58L), the first air cylinder 60, the second air cylinder 62, the lower mold holding member 64R (64L), and the third air cylinder 66, respectively.

The control device 100 is a device that controls the operation of the bending system 10 . The control device 100 is, for example, a computer such as an NC device. A computer is mainly composed of a hardware processor such as a CPU (Central Processing Unit), a memory, and various interfaces. The memory and various interfaces are connected to the hardware processor via buses.

A predetermined computer program is installed in the computer. A hardware processor executes a computer program, so that the computer executes a plurality of functions of control device 100 .

The control device 100 controls the operation of the press brake 16 based on the machining program. Further, the control device 100 controls the operations of the left and right lower mold changing units 50L and 50R and the left and right upper mold changing units 74L and 74R based on the mold changing program and setup data. Under this control, the transfer of the upper mold 12 and the lower mold 14, the arrangement of the upper mold 12 and the lower mold 14 in the upper mold holder 34 and the lower mold holder 30, and the like are performed. The memory of the control device 100 stores a machining program, a mold change program, and setup data.

The setup data is simultaneously placed in the die holders (upper die holder 34 and lower die holder 30) of the press brake 16 among the plurality of dies (upper die 12 and lower die 14) owned by the bending system 10. Data representing one or more mold stages. Specifically, the setup data includes information such as a setup number, mold layout, and parts to be processed. The mold layout includes the mold numbers of the molds that make up each stage, the length of the molds in the width direction, the mounting positions of the molds in the mold holders, and the like.

A mold stage arranged in a mold holder is composed of one mold or a group of molds in which a plurality of molds are combined in the left-right direction. When one mold stage is composed of a mold group in which a plurality of molds are combined, these molds are continuously arranged in the horizontal direction so that there are no gaps between the molds.

Hereinafter, in the bending system 10 according to the present embodiment, the left and right lower mold replacement units 50L and 50R and the left and right upper mold replacement units 74L and 74R are used to set the lower mold holder 30 and the upper mold holder 34 to desired positions. The operation of arranging the lower mold 14 and the upper mold 12 will be described. In the following description, the operation of the left and right lower mold exchanging units 50L and 50R will be taken as an example to describe the operation of arranging a mold stage made up of a plurality of lower molds 14 on the lower mold holder 30 at desired positions. Of course, the same applies to the operation of arranging a plurality of upper molds 12 on the upper mold holder 34 using the left and right upper mold exchanging units 74L and 74R.

The control device 100 arranges the plurality of lower dies 14 at predetermined positions of the lower die holder 30 by controlling the positions of the left and right lower die exchanging units 50L and 50R. Specifically, the control device 100 controls the servo motors 52 that drive the left and right lower mold replacing units 50L and 50R, respectively, and controls the positions of the left and right lower mold replacing units 50L and 50R in the horizontal direction. In position control, the control device 100 can recognize the lateral positions of the left and right lower mold exchanging units 50L and 50R based on the detection signal supplied from the encoder 54 that detects the number of rotations of the servomotor 52. . By performing position control, the control device 100 can move the left and right lower mold replacement units 50L and 50R in the left-right direction and position them at predetermined positions in the left-right direction. A plurality of lower molds 14 can be arranged at desired positions on the lower mold holder 30 by moving the left and right lower mold exchanging units 50L and 50R in the left-right direction and performing positioning operations.

On the other hand, even when a plurality of lower dies 14 are arranged at desired positions in the lower die holder 30 by position control, backlash of the drive mechanism, bending of the lower die holding members 64L and 64R, and drawing of the lower die 14 Due to various circumstances such as negative crossing, a slight gap may occur between the adjacent lower dies 14 . Therefore, the control device 100 controls the left and right lower mold exchanging units 50L and 50R to bring together the plurality of lower molds 14 so as to eliminate the gap between the lower molds. This shifting operation is performed by operating the left and right lower mold exchanging units 50L and 50R under position control by the control device 100. As shown in FIG.

3A to 3D and 4A to 4D are diagrams showing the procedure of the gathering operation according to the first embodiment. The shifting operation according to the first embodiment will be described below with reference to FIGS. 3A to 3D and FIGS. 4A to 4D. In the figure, seven lower dies 14a to 14h are shown as an example of the plurality of lower dies 14. As shown in FIG. The seven lower molds 14a to 14h are arranged from left to right in the order of lower mold 14a, lower mold 14b, lower mold 14c, lower mold 14d, lower mold 14e, lower mold 14f, lower mold 14g, and lower mold 14h. there is

In the bending system 10 according to this embodiment, the mold rack 42 is arranged on the right side of the press brake 16 . Therefore, the lower mold 14 transferred from the mold rack 42 to the lower mold holder 30 mainly moves from the right side to the left side. Therefore, among the seven lower dies 14a to 14h, the lower die 14a located at the leftmost end is used as a reference lower die 14a that serves as a reference for the shifting operation. However, the reference lower mold is not limited to the lower mold 14a.

As shown in FIG. 3A, the control device 100 moves the left lower mold replacing unit 50L in the horizontal direction to align the left lower mold replacing unit 50L with the reference lower mold 14a (alignment operation). . The positioning operation is performed so that the position of the left lower mold holding member 64L and the position of the insertion hole 141 of the reference lower mold 14a are aligned (the same applies to the following positioning operation).

The control device 100 selects an arbitrary lower mold from among the remaining lower molds 14b to 14h excluding the reference lower mold 14a as the first target lower mold. In this embodiment, the middle lower mold 14e among the remaining lower molds 14b to 14h is the first target lower mold 14e. The control device 100 moves the right lower mold replacing unit 50R in the left-right direction to align the right lower mold replacing unit 50R with the target lower mold 14e (alignment operation).

As shown in FIG. 3B, the control device 100 advances the left lower mold holding member 64L to insert the left lower mold holding member 64L into the insertion hole 141 of the reference lower mold 14a. By inserting the left lower mold holding member 64L into the insertion hole 141 of the reference lower mold 14a, the reference lower mold 14a is constrained by the left lower mold holding member 64L (constraint operation). Similarly, the control device 100 advances the right lower mold holding member 64R to insert the lower mold holding member 64R into the insertion hole 141 of the target lower mold 14e (insertion operation). The timing of advancing the right lower mold holding member 64R may be simultaneous with the timing of advancing the left lower mold holding member 64L, or may be after advancing the left lower mold holding member 64L. .

As shown in FIG. 3C, the control device 100 moves the left lower mold replacing unit 50L and the right lower mold replacing unit 50R so as to approach each other along the left-right direction so that the target lower mold 14a is replaced by the target lower mold 14a. The five lower molds 14a to 14e up to 14e are brought together in the center (execution operation).

When the execution operation is completed, the control device 100 selects the rightmost lower die 14h among the seven lower dies 14a to 14h as the second target lower die (new target lower die) 14h. Then, the control device 100 uses the right lower mold holding member 64R to insert and execute the new target lower mold 14h while continuing the restraining operation of the reference lower mold 14a by the left lower mold holding member 64L. I do.

Specifically, as shown in FIG. 3D, the control device 100 retracts the right lower mold holding member 64R and pulls out the right lower mold holding member 64R from the insertion hole 141 of the target lower mold 14e. As shown in FIG. 4A, the control device 100 moves the right lower mold replacing unit 50R in the horizontal direction to align the right lower mold replacing unit 50R with the target lower mold 14h (alignment operation). . Then, as shown in FIG. 4B, the control device 100 advances the right lower mold holding member 64R to insert the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h (insertion operation). As shown in FIG. 4C, the control device 100 moves the left lower mold replacing unit 50L and the right lower mold replacing unit 50R so as to approach each other along the left-right direction, and moves the target lower mold from the reference lower mold 14a. The seven lower molds 14a to 14h up to 14h are brought together in the center (execution operation).

Finally, as shown in FIG. 4D, the control device 100 retracts the left lower mold holding member 64L and the right lower mold holding member 64R so that the left and right lower mold holding members 64L and the right lower mold holding member 64R are moved back from the insertion holes 141 of the reference lower mold 14a and the target lower mold 14h. , the lower mold holding members 64L and 64R are pulled out.

As described above, the seven lower molds 14a to 14h can be arranged at desired positions on the lower mold holder 30 without gaps between the lower molds by performing the shifting operation.

In the above description of the shifting operation, the method of switching the target lower mold twice, such as the lower mold 14e positioned in the middle among the seven lower molds 14a to 14h and the lower mold 14h positioned at the right end, has been described. However, the number of times the target lower mold is switched can be set to a required number of times according to the number and overall length of the lower molds 14 constituting the mold stage. Further, for switching the target lower molds, an arbitrary number of lower molds 14 corresponding to the number of times of switching may be selected in order from the left side to the right side among the remaining molds excluding the reference lower mold 14a.

In addition, in the above-described shifting operation, when the left lower mold holding member 64L has already been inserted into the insertion hole 141 of the reference lower mold 14a, the left lower mold exchanging unit 50L is placed under the reference in the above description. The operation of aligning with the mold 14a and the operation of inserting the left lower mold holding member 64L into the insertion hole 141 of the reference lower mold 14a are omitted.

By the way, in such a moving operation, the insertion operation may fail, such as being unable to insert the right lower mold holding member 64R into the insertion holes 141 of the target lower molds 14e and 14h. There is The control device 100 monitors the stroke operation of the first air cylinder 60 or the third air cylinder 66, and determines failure of the insertion operation on the condition that each cylinder 60, 66 has not reached a predetermined stroke end.

Causes of insertion failure include (1) mechanical inclination of the lower mold holding members 64L and 64R, (2) the lower mold exchanging unit 50L defined with reference to a predetermined position (for example, the center) of the lower table 24, 50R deviation of the reference position, (3) the difference between the nominal length and the actual size of the lower die 14, and the resulting difference between the actual position and the theoretical position of the insertion hole 141, (4) lower die holding The difference between the actual position and the theoretical position due to the bending of the members 64L and 64R, and the like. In addition, in the shifting operation, the insertion operation and the execution operation are repeated for a plurality of target molds while the reference lower mold 14a is restrained by the left lower mold holding member 64L. Since the pressing force from the lower mold holding member 64L acts on the reference lower mold 14a every time the execution operation is performed, the collected lower molds 14 tend to be pushed out to the right as a whole. This is because such a state is repeated every time the execution operation is repeated, and minute deviations are accumulated, which makes it easier for the lower die 14 located on the right side to become misaligned.

When the control device 100 determines that the insertion operation has failed, the control device 100 executes a retry operation. The retry operation will be described in detail below. The retry operation is an operation of moving the right lower mold holding member 64R forward again and inserting the right lower mold holding member 64R again into the insertion holes 141 of the target lower molds 14e and 14h. The retry operation will be described below taking the insertion operation into the target lower mold 14h as an example. The retry operation includes an initial operation, a first retry operation, and a second retry operation.

The initial operation will be described with reference to FIGS. 5A to 5D. 5A to 5D are diagrams showing the procedure of the initial operation. In the following description of the retry operation, it is assumed that the insertion operation of inserting the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h fails (FIGS. 5A and 5B).

First, as shown in FIG. 5C, the control device 100 retracts the right lower mold holding member 64R to separate the right lower mold holding member 64R from the target lower mold 14h.

Then, as shown in FIG. 5D, the control device 100 advances the right lower mold holding member 64R to insert the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h.

In this manner, the initial operation is to move the right lower mold holding member 64R forward again while continuing the restraining operation of the reference lower mold 14a by the left lower mold holding member 64L, so that it is inserted into the insertion hole 141 of the target lower mold 14h. On the other hand, it is an operation to try to insert the right lower mold holding member 64R.

The first retry operation will be described with reference to FIGS. 6A to 6D. 6A to 6D are diagrams showing the procedure of the first retry operation. As described above, when the insertion operation into the target lower mold 14h fails even after the initial operation is performed (FIGS. 6A and 6B), the control device 100 performs the first retry operation.

First, as shown in FIG. 6C, the control device 100 retracts the left lower mold holding member 64L and pulls out the lower mold holding member 64L from the insertion hole 141 of the reference lower mold 14a. As a result, the reference lower mold 14a is released from the restraining action by the left lower mold holding member 64L. At the same time, the control device 100 retracts the right lower mold holding member 64R to separate the lower mold holding member 64R from the target lower mold 14h.

Next, as shown in FIG. 6D, the control device 100 advances the left and right lower mold holding members 64L and 64R, respectively, and inserts the left and right lower mold holding members into the insertion holes 141 of the reference lower mold 14a and the target lower mold 14h. Insert 64L and 64R, respectively.

Thus, in the first retry operation, after the left lower mold holding member 64L is retracted to release the restraining operation of the reference lower mold 14a, the left and right lower mold holding members 64L and 64R are respectively advanced to This is an operation of trying to insert the right lower mold holding member 64R into the insertion hole 141 of the mold 14h.

The second retry operation will be described below with reference to FIGS. 7A to 7D. 7A to 7D are diagrams showing the procedure of the second retry operation. If the insertion operation into the target lower mold 14h fails even after the first retry operation is performed (FIG. 7A), the control device 100 performs the second retry operation.

As shown in FIG. 7B, the control device 100 retracts the left lower mold holding member 64L and pulls out the lower mold holding member 64L from the insertion hole 141 of the reference lower mold 14a. As a result, the reference lower mold 14a is released from the restraining action by the left lower mold holding member 64L. At the same time, the control device 100 retracts the right lower mold holding member 64R to separate the lower mold holding member 64R from the target lower mold 14h.

As shown in FIG. 7C, the control device 100 advances the right lower mold holding member 64R to insert the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h.

When the right lower mold holding member 64R is successfully inserted into the target lower mold 14h, the control device 100 advances the left lower mold holding member 64L so that the reference lower mold 14a is inserted as shown in FIG. The left lower die holding member 64L is inserted into the hole 141. As shown in FIG.

Thus, in the second retry operation, after the left lower mold holding member 64L is retracted to release the restraining operation of the reference lower mold 14a, the right lower mold holding member 64R is advanced again, and then the left lower mold holding member 64R is advanced again. The die holding member 64L is advanced again. This is an operation to try to insert the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h.

As described above, according to the present embodiment, when it is determined that the insertion operation has failed, the retry operation is performed. This retry operation is performed in a state in which the left lower mold holding member 64L is retracted and the reference lower mold 14a is released from restraint. By releasing the reference lower mold 14a from the restraint, there is a margin for the reference lower mold 14a to slightly move toward the left. As a result, the lower dies 14a to 14h from the reference lower die 14a to the target lower die 14h can be slightly moved leftward as a whole, and the position of the target lower die 14h is moved. In the retry operation, the right lower mold holding member 64R can be easily inserted into the target lower mold 14h. As a result, even if the insertion operation fails once, if the right lower mold holding member 64R can be inserted into the target lower mold 14h by a retry operation, the shifting operation can be continued without generating an alarm due to the failure. can. As a result, mold placement with high positional accuracy can be completed.

In the first retry operation, the left and right lower mold holding members 64L and 64R are simultaneously advanced, but in the second retry operation, only the right lower mold holding member 64R is advanced first. In the second retry operation, even when the right lower mold holding member 64R advances, the restraining operation to the reference lower mold 14a remains released, so there is room for the reference lower mold 14a to slightly move to the left. As a result, the lower dies 14a to 14h from the reference lower die 14a to the target lower die 14h can be slightly moved to the left as a whole, and the right lower die holding member 64R can be inserted into the target lower die 14h. can be done.

Note that in the above-described embodiment, the first retry operation is performed first, and when an insertion failure occurs there, the second retry operation is additionally performed. However, if an insertion failure occurs, only the second retry operation may be executed without executing the first retry operation.

According to this embodiment, while continuing the restraining operation, the target lower mold is newly selected from the remaining lower molds 14b to 14h, and the insertion operation and the execution operation are repeatedly performed. Since the pressing force from the lower mold holding member 64L acts on the reference lower mold 14a every time the execution operation is performed, the collected lower molds 14 tend to be pushed out to the right as a whole. Therefore, such a state is repeated each time the execution operation is repeated, and minute deviations are accumulated, so that the lower die 14 located on the right side is likely to be misaligned. When the target lower mold is switched in this way, an environment is created in which failure of the insertion operation is likely to occur. 64R can be inserted into the target lower mold 14h. As a result, the shifting operation can be continued without generating an alarm due to insertion failure.

According to this embodiment, the restraining operation of the reference lower mold 14a is released by retracting the left lower mold holding member 64L. According to this configuration, the left lower mold holding member 64L can be pulled out from the insertion hole 141 of the reference lower mold 14a by retracting the left lower mold holding member 64L. As a result, the restraining operation of the reference lower mold 14a can be appropriately released.

Further, according to the present embodiment, the initial operation is executed before executing the first retry operation and the second retry operation. The initial operation is an operation to advance the right lower mold holding member 64R again while continuing the restraining operation by the left lower mold holding member 64L. Therefore, if the initial operation can lead to successful insertion, it is possible to shift to the execution operation in a short period of time. As a result, the lower die can be arranged with high positional accuracy in a short period of time.

Note that in the present embodiment, the first retry operation and the second retry operation are performed after the initial operation is performed. However, if an insertion failure is determined, the retry operation may be performed without performing the initial operation.

In the above-described embodiment, when the left lower mold holding member 64L performs the restraining operation for restraining the reference lower mold 14a, the left lower mold holding member 64L is inserted into the insertion hole 141 of the reference lower mold 14a. . However, the reference lower mold 14a may be constrained by bringing the left lower mold holding member 64L into contact with the left side surface of the reference lower mold 14a.

Further, in this embodiment, when performing the shifting operation (execution operation) for the target lower mold 14h positioned at the right end, the right lower mold holding member 64R is inserted into the insertion hole 141 of the target lower mold 14h. However, if there is sufficient space on the right side of the target lower die 14h, the shifting operation may be performed by bringing the right lower die holding member 64R into contact with the right side surface of the target lower die 14h. Since it is possible to reduce the number of times the right lower mold holding member 64R is inserted into the insertion hole 141 of the lower mold 14 in the shifting operation, the possibility of insertion failure can be reduced.

In this embodiment, when the left and right lower mold holding members 64L and 64R are advanced in the retry operation, the left and right lower mold replacement units 50L and 50R are kept stationary in the horizontal direction. The left and right lower mold exchanging units 50L, 50R may be moved in the left-right direction by a predetermined amount.

First, the first method will be explained. In this first method, the control device 100 controls the servo motor 52 of the right lower mold exchanging unit 50R and the servo motor 52 of the left lower mold exchanging unit 50L as follows.

For example, during the first retry operation shown in FIGS. 6A to 6D, the control device 100 retracts the left and right lower mold holding members 64L and 64R (FIG. 6C), causing the left and right lower mold exchanging units 50L and 50R to move. By driving the servomotors 52 respectively, the left and right lower mold exchanging units 50L and 50R are moved by a very small amount. Then, the control device 100 advances the left and right lower mold holding members 64L, 64R to insert the left and right lower mold holding members 64L, 64R into the insertion holes 141 of the lower molds 14a, 14h (Fig. 6D).

Similarly, during the second retry operation shown in FIGS. 7A to 7D, the control device 100 causes the left and right lower mold holding members 64L and 64R to retreat (FIG. 7B), and the left and right lower mold exchanging units 50L and 50R , respectively, to move the left and right lower mold exchanging units 50L, 50R by a very small amount. Then, the control device 100 advances the right lower mold holding member 64R to insert the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h (FIG. 7C). Further, the control device 100 advances the left lower mold holding member 64L to insert the left lower mold holding member 64L into the insertion hole 141 of the reference lower mold 14a (FIG. 7D).

According to this first method, the control device 100 controls the servo motor 52 (driving mechanism) that drives the right lower mold exchanging unit 50R in the left-right direction and the servo motor that drives the left lower mold exchanging unit 50L in the left-right direction. 52 (driving mechanism) is controlled to move the left and right lower mold exchanging units 50L and 50R by a predetermined amount by the driving force of the driving mechanism. According to this configuration, even when there is a misalignment between the insertion holes 141 of the lower dies 14a, 14h and the left and right lower die holding members 64L, 64R, the left and right lower die exchanging units 50L, 50R can be moved by a predetermined amount. , the deviation between the insertion holes 141 of the lower molds 14a, 14h and the left and right lower mold holding members 64L, 64R can be reduced. As a result, it is possible to suppress the failure of the insertion operation in the retry operation.

In the above description, the left and right lower mold exchanging units 50L and 50R are respectively moved. There may be. In addition, the direction in which the left and right lower mold exchanging units 50L and 50R are moved is the direction in which the displacement between the insertion hole 141 and the left and right lower mold holding members 64L and 64R is reduced. Either one of the left and right is predetermined.

Next, the second method will be explained. In this second method, the control device 100 controls the servo motor 52 of the right lower mold exchanging unit 50R and the servo motor 52 of the left lower mold exchanging unit 50L as follows.

For example, in the first retry operation shown in FIGS. 6A to 6D, when the left and right lower mold holding members 64L and 64R are retracted (FIG. 6C), the control device 100 causes the servos of the left and right lower mold exchanging units 50L and 50R to Power supply to the motors 52 is stopped to put them in a servo-off state. As a result, the braking force that restricts the left and right lower mold exchanging units 50L and 50R from moving in the left and right direction is released, so that the left and right lower mold exchanging units 50L and 50R can move freely in the left and right direction. Then, the control device 100 advances the left and right lower mold holding members 64L and 64R while the servo is off, and inserts the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h (FIG. 6D).

Similarly, in the second retry operation shown in FIGS. 7A to 7D, when the left and right lower mold holding members 64L and 64R are retracted (FIG. 7B), the control device 100 causes the left and right lower mold exchanging units 50L and 50R to move. Power supply to each of the servo motors 52 is stopped, and the servo is turned off. As a result, the braking force restricting the lateral movement of the left and right lower mold exchanging units 50L, 50R is released, so that the left and right lower mold exchanging units 50L, 50R can move freely in the left and right direction. Then, the control device 100 advances the right lower mold holding member 64R in the servo-off state to insert the right lower mold holding member 64R into the insertion hole 141 of the target lower mold 14h (FIG. 7C). Further, the control device 100 advances the left lower mold holding member 64L in the servo-off state to insert the left lower mold holding member 64L into the insertion hole 141 of the reference lower mold 14a (FIG. 7D).

According to the second method, the control device 100 controls the servo motor 52 (driving mechanism) that drives the right lower mold exchanging unit 50R in the left-right direction and the servo motor that drives the left lower mold exchanging unit 50L in the left-right direction. 52 (driving mechanism) to release the braking force that restricts the lateral movement of the left and right lower mold exchanging units 50L and 50R, the external force that the left and right lower mold holding members 64L and 64R receive from the insertion holes 141. , the left and right lower mold exchanging units 50L and 50R are moved by a predetermined amount. According to this configuration, even when there is a misalignment between the insertion holes 141 of the lower dies 14a, 14h and the left and right lower die holding members 64L, 64R, when the left and right lower die holding members 64L, 64 are advanced, In addition, the left and right lower mold holding members 64L, 64 receive an external force from the insertion hole 141. As shown in FIG. Therefore, the left and right lower mold exchanging units 50L, 50R are moved so that the left and right lower mold holding members 64L, 64 follow the positions of the insertion holes 141 . As a result, it is possible to suppress the failure of the insertion operation in the retry operation.

According to the second method, when the left and right lower mold holding members 64L, 64R are moved forward, the left and right lower mold exchanging units 50L, 50R move freely in the left and right direction. Therefore, after advancing the left and right lower mold holding members 64L, 64R, the control device 100 uses the driving force of the drive mechanism to correct the error between the current position and the target position, so that the left and right lower mold changing units 50L, 50R are corrected. can be moved. Alternatively, the control device 100 may set the current position when the left and right lower mold holding members 64L and 64R are advanced as the final target position.

Moreover, the above first and second methods may be applied not only to the first and second retry operations, but also to the control of the servo motor 52 of the right lower mold exchanging unit 50R in the initial operation.

(Second embodiment)
The bending system 10 according to the second embodiment will be described below. The difference between the bending system 10 according to the second embodiment and the bending system according to the first embodiment is the procedure of the gathering operation. The bending system 10 according to the second embodiment will be described below, focusing on differences from the bending system 10 according to the first embodiment.

8A to 8D and 9A to 9D are diagrams showing the procedure of the gathering operation according to the second embodiment. The shifting operation according to the second embodiment will be described below with reference to FIGS. 8A to 8D and FIGS. 9A to 9D. The operations of Figures 8A through 8C correspond to the operations of Figures 3A through 3C.

When the execution operation for the first target lower mold 14e is completed, as shown in FIG. 8D, the control device 100 retracts the left and right lower mold holding members 64L and 64R, respectively, to move the reference lower mold 14a and the target lower mold The left and right lower mold holding members 64L and 64R are pulled out from the insertion holes 141 of 14e.

As shown in FIG. 9A, the control device 100 moves the right lower mold replacing unit 50R in the left-right direction to align the right lower mold replacing unit 50R with the second target lower mold 14h. combined operation).

As shown in FIG. 9B, the control device 100 advances the left and right lower mold holding members 64L, 64R, respectively, and inserts the left and right lower mold holding members 64L, 64R into the insertion holes 141 of the reference lower mold 14a and the target lower mold 14h. (insert action).

As shown in FIG. 9C, the control device 100 moves the left lower mold replacing unit 50L and the right lower mold replacing unit 50R so as to approach each other along the left-right direction so that the target lower mold 14a is replaced by the target lower mold 14a. The seven lower molds 14a to 14h up to 14h are brought together in the center (execution operation).

Finally, as shown in FIG. 9D, the control device 100 retracts the left and right lower mold holding members 64L and 64R, and moves the left and right lower mold holding members 64L from the insertion holes 141 of the reference lower mold 14a and the target lower mold 14h. , 64R, respectively.

As described above, the seven lower molds 14a to 14h can be arranged at desired positions on the lower mold holder 30 without gaps between the lower molds by performing the shifting operation.

As described above, according to the present embodiment, when inserting the right lower mold holding member 64R into the target lower mold 14h, the restrained state of the reference lower mold by the left lower mold holding member 64L is temporarily released, and The left and right lower mold holding members 64L, 64R are simultaneously inserted into the reference lower mold 14a and the target lower mold 14h.

According to this operation, the constraint operation to the reference lower mold 14a is temporarily released, so there is a margin for the reference lower mold 14a to slightly move leftward. As a result, the whole from the reference lower mold 14a to the target lower mold 14h can slightly move leftward, and the position of the target lower mold 14h is moved. As a result, the right lower mold holding member 64R can be inserted into the target lower mold 14h. Therefore, the shifting operation can be continued without generating an alarm due to insertion failure. As a result, mold placement with high positional accuracy can be achieved.

In the above-described first and second embodiments, the left and right lower mold replacement units 50L, 50R and the left and right upper mold replacement units 74L, 74R are illustrated as the first and second moving bodies. However, the first and second moving bodies are not limited to this. In addition, in the first and second embodiments described above, the left and right lower mold changing units 50L, 50R and the left and right upper mold changing units 74L, 74R are provided on the rear surface side of the lower table 24 and the upper table 26 . may be provided on the front side of the lower table 24 and the upper table 26 .

While embodiments of the present invention have been described above, the discussion and drawings forming part of this disclosure should not be construed as limiting the invention. Various alternative embodiments, implementations and operational techniques will become apparent to those skilled in the art from this disclosure.

10 bending system 12 upper mold (mold)
121 insertion hole 14 lower mold (mold)
141 insertion hole 16 press brake 18 body frame 20 side plate 24 lower table 26 upper table 30 lower mold holder 34 upper mold holder 42 mold rack 50L, 50R lower mold exchange unit (mold exchange unit, moving body)
52 servo motor 54 encoder 64L, 64R lower mold holding member (mold holding member)
72 upper guide 74L, 74R upper mold exchange unit (mold exchange unit, moving body)
76 servo motor 78 encoder 88L, 88R upper mold holding member (mold holding member)
100 control device

Claims (13)

a press brake in which a plurality of molds are arranged in the left-right direction on a mold holder provided on the table;
It has a mold holding member that can be inserted into and removed from an insertion hole provided in the mold by moving forward and backward along the front-rear direction, and is provided movably in the left-right direction on the rear surface side or the front surface side of the table. a first moving body and a second moving body,
a control device that controls the first and second moving bodies, respectively, to gather the plurality of molds together so that there is no gap between the molds,
The moving operation is
a restraining operation in which a first mold holding member of the first moving body is advanced to restrain a reference mold located at one end of the plurality of molds with the first mold holding member;
The second mold holding member of the second moving body is advanced to enter the insertion hole of the target mold selected from the remaining molds excluding the reference mold among the plurality of molds. an insertion operation for inserting the second mold holding member;
an execution operation of moving the first and second moving bodies so as to approach each other along the left-right direction to gather the molds from the reference mold to the target mold;
The control device is
When it is determined that the insertion operation has failed, the first mold holding member is retracted to release the restraint operation, and then the second mold holding member is advanced again to fit into the insertion hole of the target mold. A bending system that performs a retry operation for inserting the second mold holding member. The moving operation is
2. The bending system according to claim 1, further comprising an operation of repeatedly selecting the target mold from among the remaining molds while continuing the restraining operation, and repeating the insertion operation and the execution operation. The retry operation is
Each of the first and second mold holding members is advanced to restrain the reference mold with the first mold holding member, and the second mold holding member is inserted into the insertion hole of the target mold. 2. The bending system of claim 1, comprising a first retry action of inserting. The retry operation is
The second mold holding member is advanced to insert the second mold holding member into the insertion hole of the target mold, and then the first mold holding member is advanced to move the reference mold. 2. The bending system according to claim 1, further comprising a second retry operation to constrain with the first die holding member. The retry operation is
The second mold holding member is advanced to insert the second mold holding member into the insertion hole of the target mold, and then the first mold holding member is advanced to move the reference mold. further comprising a second retry operation to constrain with the first mold holding member;
The control device is
4. The bending system according to claim 3, wherein the first retry operation is performed first, and the second retry operation is performed when failure of the first retry operation is determined. The control device is
When it is determined that the insertion operation has failed, the second mold holding member is retracted while the restraining operation is continued, and then the second mold holding member is advanced again to insert the target mold. performing an initial operation of inserting the second mold holding member into the hole,
The bending system according to any one of claims 1 to 5, wherein the retry operation is performed when failure of the initial operation is determined. 6. When moving the first mold holding member and the second mold holding member forward in the retry operation, the first moving body and the second moving body are moved in the horizontal direction by a predetermined amount. or the bending system according to claim 1. The control device is
A driving mechanism for driving the first moving body and the second moving body in the horizontal direction is controlled, and the driving force of the driving mechanism moves the first moving body and the second moving body by the predetermined amount. 8. The bending system according to 7. The control device is
By controlling a drive mechanism that drives the first moving body and the second moving body in the horizontal direction to release the braking force that restricts the horizontal movement of the first moving body and the second moving body, 8. The bending system according to claim 7, wherein the first moving body and the second moving body are moved by the predetermined amount by an external force that the first mold holding member and the second mold holding member receive from the insertion hole. 7. The bending system according to claim 6, wherein when advancing the second mold holding member in the initial operation, the second moving body is moved in the lateral direction by a predetermined amount. The control device is
11. The bending system according to claim 10, further comprising controlling a driving mechanism that drives the second moving body in the left-right direction, and moving the second moving body by the predetermined amount by the driving force of the driving mechanism. The control device is
By controlling the drive mechanism that drives the second moving body in the left-right direction to release the braking force that restricts the left-right movement of the second moving body, the second mold holding member moves out of the insertion hole. 11. The bending system according to claim 10, wherein the external force received moves the second moving body by the predetermined amount. A control device for controlling a first moving body and a second moving body provided movably in the left-right direction on the rear side or the front side of a table of a press brake has a plurality of dies in a die holder provided on the table. In the method of arranging the mold for arranging along the horizontal direction,
The control device
controlling the first and second moving bodies to bring together the plurality of molds so that there is no gap between the molds arranged in the mold holder;
The moving operation is
A first mold holding member of the first moving body is advanced in the front-rear direction, and a reference mold positioned at one end of the plurality of molds is restrained by the first mold holding member. and
The second mold holding member of the second moving body is advanced in the front-rear direction, and the target mold selected from the remaining molds excluding the reference mold among the plurality of molds is selected. an insertion operation of inserting the second mold holding member into the insertion hole;
an execution operation of moving the first and second moving bodies so as to approach each other along the left-right direction to gather the molds from the reference mold to the target mold;
When determining that the insertion operation has failed, the control device
After the first mold holding member is retracted to release the restraining operation, the second mold holding member is advanced again to insert the second mold holding member into the insertion hole of the target mold. The method of arranging the mold that performs the retry operation.

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