JP6622603B2 - Program creation apparatus and machining order change method - Google Patents

Description

  The present invention relates to a program creation device for creating a machining program (machining data) for performing machining including punching on a plate-like workpiece (sheet metal) by an electric punch press, and changes the machining order of the machining programs. The present invention relates to a processing order changing method.

  In recent years, instead of a hydraulic punch press that raises and lowers a ram by driving a hydraulic cylinder, an electric punch press that raises and lowers a ram by driving an electric motor such as a servo motor has been widely used. On the other hand, if continuous punching with an electric punch press is performed for a long time at a predetermined hit rate (number of punches per unit time), the load on the electric motor may become excessive and the electric motor may overheat. is there. Therefore, the load of the electric motor is prevented from becoming excessive by usually reducing the hit rate by applying the hit rate regulation or cooling the electric motor by driving the fan (see Patent Document 1).

JP 2004-25191 A

  By the way, when the hit rate is lowered, there is a problem that the entire processing time by the punch press becomes longer and the productivity of the punch press is lowered. Further, when the electric motor is cooled by driving the fan, the power consumption of the punch press increases, and it becomes difficult to improve the energy saving performance of the punch press. That is, in the electric punch press, there is a problem that it is difficult to improve the productivity and energy saving of the punch press while preventing overheating of the electric motor.

  Accordingly, an object of the present invention is to provide a program creation device and a processing order changing method having a new configuration that can solve the above-described problems.

  A first aspect of the present invention is a program creation device for creating a machining program (machining data) for performing machining including punching (punching) on a plate-like workpiece (sheet metal) by an electric punch press. And, based on the processing program, the hit rate restriction is predicted before (immediately before) the hit rate restriction timing, the restriction timing prediction unit for predicting the hit point restriction timing during the operation of the punch press. And a machining order changing unit that changes the machining order of the machining program so as to perform machining that does not take place. Here, the electric punch press includes an electric motor that moves the ram up and down.

  According to the first aspect of the present invention, the restriction timing prediction unit predicts a hit rate restriction timing during the operation of the punch press based on the machining program. Then, the processing order changing unit changes the processing order of the processing program so as to perform processing that does not require hit rate regulation before the timing of hit rate regulation. Accordingly, when the punch press is operated (operated) based on the machining program whose machining order is changed, the hit rate of the electric motor is reduced without lowering the hit rate and without cooling the electric motor with a fan. It is possible to prevent the load from becoming excessive.

  The second aspect of the present invention changes the processing order of a processing program (processing data) for performing processing including punching (punching) on a plate-shaped workpiece (sheet metal) by an electric punch press. A processing order changing method, wherein a restriction timing prediction step for predicting hit rate restriction timing during operation of the punch press based on the machining program, and hit rate restriction after completion of the restriction timing prediction step A machining order changing step for changing the machining order of the machining program so as to perform machining without hit rate restriction before (immediately before) the timing.

  According to the second aspect of the present invention, based on the machining program, the timing at which the hit rate is regulated during operation of the punch press is predicted. Then, before the timing at which the hit rate restriction is applied, the machining order of the machining program is changed so as to perform the machining without hit rate restriction. Accordingly, when the punch press is operated (operated) based on the machining program whose machining order is changed, the hit rate of the electric motor is reduced without lowering the hit rate and without cooling the electric motor with a fan. It is possible to prevent the load from becoming excessive.

  According to the present invention, as described above, it is possible to prevent an excessive load on the electric motor without reducing the hit rate and without cooling the electric motor with a fan. Therefore, according to the present invention, while preventing overheating of the electric motor, the overall processing time by the punch press is greatly shortened to improve the productivity of the punch press, and The power consumption can be reduced and the energy saving performance of the punch press can be improved.

FIG. 1 is a block diagram of a combined machining system according to an embodiment of the present invention. FIG. 2 is a schematic side view of the multi-task machine according to the embodiment of the present invention. FIG. 3 is a conceptual diagram showing the relationship between the machining time and the predicted temperature of the servo motor. FIG. 3 shows the timing at which the hit rate is restricted. FIG. 4 is a flowchart for explaining the operation of the embodiment of the present invention and the processing order changing method according to the embodiment of the present invention. FIG. 5 is a flowchart for explaining the operation of the embodiment of the present invention and the processing order changing method according to the embodiment of the present invention. FIG. 6 is a flowchart for explaining the operation of the embodiment of the present invention and the processing order changing method according to the embodiment of the present invention. FIG. 7 is a flowchart for explaining the operation of the embodiment of the present invention and the processing order changing method according to the embodiment of the present invention.

  An embodiment of the present invention will be described with reference to FIGS. In FIG. 2, “U” indicates the upward direction, and “D” indicates the downward direction.

  As shown in FIGS. 1 and 2, the combined machining system 1 according to the embodiment of the present invention performs punching (punching) and laser machining on a plate-shaped workpiece (sheet metal) W based on a machining program. It is a system to do. The composite processing system 1 controls the composite processing machine 3 (an example of an electric punch press) 3 that performs punching and laser processing on the plate-like workpiece W, and the composite processing machine 3 based on a processing program. An NC device 5 is provided. The combined machining system 1 includes an HMI (Human Machine Interface) device 7 that sets a machining schedule for a plurality of workpieces W, and a program creation device 9 that creates a machining program.

  The multi-tasking machine 3 includes a punching unit 11 that performs punching on the workpiece W. The configuration of the punching unit 11 will be briefly described as follows. The punching unit 11 includes an upper turret 15 that holds a plurality of punch dies 13 and a lower turret 19 that faces the upper turret 15 in the vertical direction and holds a plurality of die dies 17. The punching unit 11 is configured to be able to index the predetermined punch die 13 and the predetermined die die 17 to the punching position P1 of the punching unit 11 by the synchronous rotation of the upper turret 15 and the lower turret 19. In addition, the punching unit 11 has a ram 23 that moves up and down by driving a servo motor 21. A specific configuration for raising and lowering the ram 23 is a known configuration shown in Japanese Patent Application Laid-Open Nos. 2006-130569 and 2009-208144. Further, the ram 23 includes a striker 25 that presses a predetermined punch die 13 on the lower side (the lower side of the ram 23).

  The multi-tasking machine 3 includes a laser processing unit 27 that performs laser processing on the workpiece W. The configuration of the laser processing unit 27 will be briefly described as follows. The laser processing unit 27 has a laser processing head 29 that emits laser light while ejecting an assist gas toward the workpiece W. The laser processing head 29 is optically connected to a laser oscillator (not shown) that oscillates laser light, and is connected to an assist gas supply source (not shown) for supplying assist gas. The laser processing head 29 can move in the Y-axis direction. In other words, the laser irradiation position P2 of the laser processing unit 27 can be changed in the Y-axis direction.

  The multi-tasking machine 3 includes a workpiece moving unit 31 that moves the workpiece W in the X-axis direction and the Y-axis direction with respect to the punching position P1 and the laser irradiation position P2, and the configuration of the workpiece moving unit 31 is simple. This is as follows. The workpiece moving unit 31 has a carriage base 33 that can move in the Y-axis direction, and the carriage base 33 extends in the X-axis direction. The carriage base 33 includes a carriage 35 that is movable in the X-axis direction at an appropriate position (appropriate position of the carriage base 33). The carriage 35 includes a plurality of (only one shown) clampers 37 that clamp the end of the workpiece W at appropriate positions (appropriate positions of the carriage 35).

  The NC device 5 is means for numerically controlling the punching unit 11, the laser processing unit 27, and the workpiece moving unit 31 based on the processing program converted from the program creation device 9 into NC data.

  The HMI device 7 is a computer having a memory and a CPU, and includes a schedule registration unit (schedule creation unit) 39. The schedule registration unit 39 is means for registering (creating) schedule data representing the number of workpieces W to be processed and a processing schedule including the processing order (sheet order) of the plurality of workpieces W. The HMI device 7 also includes an input unit 41 operated by an operator and a display unit 43 that displays a processing schedule and the like.

  The program creation device 9 is a computer having a memory and a CPU, and includes a program storage unit 45, a program creation unit 47, a regulation timing prediction unit 49, and a processing order change unit 51.

  The program storage unit 45 is means for storing (registering) the machining program created by the program creation unit 47 for each different workpiece W. The program storage unit 45 adds the schedule data registered by the schedule registration unit 39 and stores the machining program.

  The program creation unit 47 includes workpiece information (information indicating the dimensions and materials of the workpiece W), product graphic information (information indicating the graphic of the product), and mold information (information indicating the dimensions and shapes of the molds 13 and 17). ) And the like, and a means for creating a machining program for machining the workpiece W. Specifically, for example, the program creation unit 47 creates nesting data for performing nesting (cutting) on the workpiece W based on the workpiece information, product graphic information, and the like. The program creation unit 47 creates assignment data for assigning the molds 13 and 17 based on the product graphic information and the mold information. Then, the program creation unit 47 adds the allocation data of the dies 13 and 17, the processing order data representing the processing order of the plurality of processing parts in one workpiece W, and other condition data to the nesting data. A machining program is created. The condition data includes schedule data. When the processing content of the workpiece W is only laser processing, the allocation data is not included in the processing program.

  The restriction timing prediction unit 49 is a means for predicting the timing of hit rate restriction during operation of the multi-tasking machine 3 based on the machining program, and includes a motor predicted temperature calculation unit 53 and a determination unit 55. ing. Here, the timing at which the hit rate is regulated refers to the timing for regulating the hit rate, for example, the timing at which the predicted temperature of the servo motor 21 exceeds the allowable temperature of the servo motor 21. The timing at which the hit rate is restricted does not necessarily exist once during the operation of the multi-function machine 3, but may exist multiple times during the operation of the multi-function machine 3, as shown in FIG.

  As shown in FIGS. 1 and 3, the predicted motor temperature calculation unit 53 calculates the number of punches (number of punches) and the processing time based on the processing program, and also calculates the servo motor based on the number of punches, the processing time, and the like. 21 is a means for calculating 21 predicted temperatures. The determination unit 55 is a unit for determining at which timing the predicted temperature of the servo motor 21 calculated by the predicted motor temperature calculation unit 53 exceeds the allowable temperature of the servo motor 21. In other words, the restriction timing prediction unit 49 is a means for predicting the timing of the hit rate restriction during the operation of the multi-tasking machine 3 based on the determination result of the determination unit 55.

  The processing order changing unit 51 sets the processing order of the processing program so that laser processing is performed as processing without hit rate regulation before (immediately before) the hit rate regulation predicted by the regulation timing prediction unit 49. It is a means to change. Specifically, when the plurality of workpieces W are processed according to the processing schedule, the processing order changing unit 51 performs laser processing before (immediately before) the workpiece W scheduled to be punched at a timing where the hit rate is restricted. This is means for changing the machining order of the machining schedule (machining program) so as to machine another workpiece W having the largest machining ratio. In addition, when the workpiece W to be punched is the first piece (first piece in the machining schedule) at the timing at which the hit rate restriction is applied, the processing order changing unit 51 is immediately before the timing at which the hit rate restriction is applied (immediately before). Further, it is a means for changing the processing order of the processing program for the first workpiece W so as to perform laser processing on the first workpiece W excluding outer periphery cutting (laser cutting processing on the outer periphery of the product). . Further, the processing order changing unit 51 has other functions as described below.

  Here, the other workpiece W having the highest laser processing rate means a workpiece W having the highest rate of laser processing time (laser processing time) in the processing time (total processing time) per sheet. In addition, it is intended to include a workpiece W whose processing content is only laser processing. The workpiece W having the largest laser processing time ratio is selected as a candidate for the workpiece W to be processed before (immediately before) the workpiece W scheduled to be punched at the timing when the hit rate is restricted. The machining order of the machining program includes the machining order of a plurality of workpieces W (the machining order of workpieces W in machining schedule units) and the machining order of a plurality of workpieces in one workpiece W. Changing the processing order of the processing program includes changing the allocation data of the dies 13 and 17.

  Next, with reference to FIGS. 1 and 4 to 7, the operation of the embodiment of the present invention will be described including the processing order changing method according to the embodiment of the present invention. The processing order changing method according to the embodiment of the present invention is a method of changing the processing order of a processing program for performing punching and laser processing on a plate-like workpiece W by the multi-tasking machine 3, and the regulation timing. A prediction step and a processing order change step are provided.

  When the machining program includes schedule data, in other words, when there are a plurality of workpieces W to be machined (step S101 in FIG. 4), the restriction timing prediction unit 49 determines the hit rate restriction timing. (Step S102 in FIG. 4 (regulation timing prediction step)). Specifically, the predicted motor temperature calculation unit 53 calculates the predicted temperature of the servo motor 21 based on the machining program, and the determination unit 55 determines at what timing the predicted temperature of the servo motor 21 exceeds the allowable temperature. Determine whether or not. Based on the determination result of the determination unit 55, the restriction timing prediction unit 49 predicts the timing of the hit rate restriction during the operation of the multi-task machine 3. When there is no timing for hit rate restriction, the CPU of the program creation device 9 does not change the machining order of the machining program (steps S103 and S104 in FIG. 4).

  When the number of workpieces W scheduled to be punched at the timing when the hit rate is restricted is the second and subsequent workpieces (steps S103 and S105 in FIG. 4), the processing order changing unit 51 precedes the scheduled workpiece W. Then, the machining order of the machining program is changed so that another workpiece W having the highest laser machining ratio is machined (steps S106 and S107 in FIG. 4 (machining order changing step)). If there is no next timing for hit rate regulation during the punching of the scheduled workpiece W and after the punching of the scheduled workpiece W is finished (steps S108 and S109 in FIG. 4), the program The CPU of the creation device 9 determines the machining program with the machining order changed as described above (step 110 in FIG. 4). Further, when there is no next timing subject to hit rate regulation in the middle of punching of the planned workpiece W, and there is a next timing subject to hit rate regulation after the completion of punching of the scheduled workpiece W 4 (steps S108 and S109 in FIG. 4), the CPU of the program creation device 9 returns to before step S106 in FIG. 4 and executes the subsequent processing. The determined processing order of the processing program is displayed on the display unit 43 as part of the processing schedule data, and the schedule data registration unit 39 registers the determined processing order of the processing program as part of the processing schedule data. However, it is possible not to register by the operation of the input unit 41 by the operator.

  When the scheduled workpiece W is the first one or when the other workpiece W does not exist (steps S105 and S106 in FIG. 4), the processing order changing unit 51 before the timing of hit rate regulation. Then, the processing order of the processing program is changed so as to perform laser processing excluding the outer periphery cutting processing on the planned workpiece W (steps S201 and S202 in FIG. 5 (processing order changing step)). Then, the CPU of the program creation device 9 returns to before step S109 in FIG. 4 and executes the subsequent processing. Here, the outer periphery cutting processing refers to laser cutting processing of the outer periphery of the portion corresponding to the product in the workpiece W.

  When the scheduled workpiece W is the first one or when the other workpiece W does not exist (steps S105 and S106 in FIG. 4), laser processing other than outer peripheral cutting is performed for processing the scheduled workpiece W. On condition that it does not exist (steps S201 and S202 in FIG. 5), the processing order changing unit 51 changes the allocation data of the dies 13 and 17 before (immediately before) the timing at which the hit rate is restricted. Specifically, the machining order changing unit 51 uses the small-diameter molds 13 and 17 instead of the large-diameter molds 13 and 17 for the planned workpiece W before the timing of hit rate regulation. Do punching. When the allocation of the dies 13 and 17 cannot be changed, the regulation machining order changing unit 51 performs punching with a small punching resistance on the scheduled workpiece W before the timing at which the hit rate is restricted. The machining order of the machining program is changed so as to be performed (steps S203 and S204 in FIG. 5 (machining order changing step)). On the other hand, when punching with a small punching resistance is performed on the scheduled workpiece W at the timing when the hit rate is restricted, the CPU of the program creation device 9 does not change the machining order of the machining program (step of FIG. 5). S203, S205). Then, the CPU of the program creation device 9 returns to before step S109 in FIG. 4 and executes the subsequent processing.

  Here, the large-diameter molds 13 and 17 refer to, for example, the molds 13 and 17 having a mold size of 3.5 inches or 4.5 inches, and the small-diameter molds 13 and 17 are For example, it refers to the molds 13 and 17 having a mold size of 0.5 inches, 1.25 inches, or 2 inches. Punching with a small punching resistance refers to punching with dies 13 and 17 having a die size of 2 inches or less, for example.

  If there is a next timing that is subject to hit rate regulation during the punching of the scheduled workpiece W (step S108 in FIG. 4), the machining order change unit 51 determines the next timing that imposes hit rate regulation. Before, the processing order of the processing program is changed so that laser processing excluding the outer periphery cutting processing is performed on the scheduled workpiece W (steps S301 and S302 (processing order changing step in FIG. 6)). Then, the CPU of the program creation device 9 returns to before step S109 in FIG. 4 and executes the subsequent processing.

  If there is a next timing that restricts the hit rate during the punching of the scheduled workpiece W (step S108 in FIG. 4), laser processing other than the outer peripheral cutting is performed for the processing of the scheduled workpiece W. On the condition that it does not exist (step S301 in FIG. 6), the processing order changing unit 51 changes the allocation data of the dies 13 and 17 before (immediately before) the next timing where the hit rate restriction is imposed. Specifically, the machining order changing unit 51 replaces the large-diameter molds 13 and 17 with respect to the planned workpiece W before the next timing when the hit rate is restricted, instead of the small-diameter molds 13 and 17. In step 17, punching is performed. When the allocation of the dies 13 and 17 cannot be changed, the regulation machining order changing unit 51 performs punching with a small punching resistance on the scheduled workpiece W before the timing at which the hit rate is restricted. The machining order of the machining program is changed so as to be performed (steps S303 and S304 in FIG. 6 (machining order changing step)). On the other hand, when punching with a small punching resistance is performed at the next timing when the hit rate restriction is applied, the CPU of the program creation device 9 does not change the machining order of the machining program (steps S303 and S305 in FIG. 6). Then, the CPU of the program creation device 9 returns to before step S109 in FIG. 4 and executes the subsequent processing.

  When the machining program does not include schedule data, in other words, when the number of workpieces W to be machined is 1 (step S101 in FIG. 4), the restriction timing prediction unit 49 determines the hit rate restriction timing. (Step S401 in FIG. 7 (regulation timing prediction step)). If there is no timing for restricting the hit rate, the CPU of the program creation device 9 does not change the machining order of the machining program (steps S402 and S403 in FIG. 7).

  If there is a timing that restricts the hit rate in the middle of punching one workpiece W (step S402 in FIG. 7), the processing order changing unit 51 sets 1 before the timing that restricts the hit rate. The processing order of the processing program is changed so that laser processing excluding the outer periphery cutting processing is performed on a single workpiece W (steps S404 and S405 in FIG. 7 (processing order change step)). If there is no next timing for hit rate regulation in the middle of punching one workpiece W (step S406 in FIG. 7), the CPU of the program creation device 9 changes the machining order of the machining program. The determination is made in the changed state as described above (step 407 in FIG. 7). In addition, when there is a next timing that restricts the hit rate in the middle of punching one workpiece W (step S406 in FIG. 7), the CPU of the program creation device 9 in step S404 in FIG. Go back and perform subsequent processing.

  On the condition that there is no laser processing other than the outer periphery cutting processing for processing one workpiece W (step S404 in FIG. 7), the processing order changing unit 51 before (immediately before) the timing at which the hit rate restriction is applied. The allocation data of the dies 13 and 17 is changed. Specifically, the processing order changing unit 51 changes the allocation data of the dies 13, 17 before the timing when the hit rate is restricted. Instead of this, punching is performed with the small-diameter molds 13 and 17. When the allocation of the dies 13 and 17 cannot be changed, the regulation machining order changing unit 51 performs punching with a small punching resistance on one workpiece W before the timing at which the hit rate is restricted. The machining order of the machining program is changed so as to be performed (steps S408 and S409 in FIG. 7 (machining order changing step)). On the other hand, when punching with a small punching resistance is performed on one workpiece W at the timing when the hit rate is restricted, the CPU of the program creation device 9 does not change the machining order of the machining program (step in FIG. 7). S403). Then, the CPU of the program creating device 9 moves to step S406 in FIG. 7 and executes the process.

  As described above, the restriction timing prediction unit 49 predicts the hit rate restriction timing during operation of the multi-tasking machine 3 based on the machining program. Then, the machining order changing unit 51 changes the machining order of the machining program so as to perform machining that does not require hit rate regulation before the workpiece W scheduled to be punched at the timing when the hit rate regulation is performed. Thus, when the multi-tasking machine 3 is operated (operated) based on the machining program whose machining order has been changed, the servo motor 21 can be operated without lowering the hit rate and cooling the servo motor 21 with a fan. It is possible to prevent the load from becoming excessive.

  Therefore, according to the embodiment of the present invention, the overheating of the servomotor 21 is prevented, and the entire processing time by the multi-tasking machine 3 is greatly shortened to improve the productivity of the multi-tasking machine 3. Thus, the power consumption of the multi-task machine 3 can be reduced, and the energy-saving performance of the multi-task machine 3 can be improved.

  In addition, this invention is not restricted to description of the above-mentioned embodiment, It can implement in a various aspect as follows.

  For example, the NC device 5 and the program creation device 9 may be combined into a single control device. Further, the NC device 5 may have some functions of the program creation device 9 (functions as the restriction timing prediction unit 49 and the processing order change unit 51). In this case, while punching or the like is performed on the workpiece W, the timing at which the hit rate is restricted may be predicted, and the processing order of the processing program may be changed. Furthermore, the technical idea applied to the composite processing system 1 may be applied to an electric punch press (not shown) that performs only punch processing on the workpiece W.

  The scope of rights encompassed by the present invention is not limited to the above-described embodiment.

W Work 1 Combined processing system 3 Combined processing machine 5 NC device 7 HMI device 9 Program creation device 11 Punch processing unit 13 Punch die 15 Upper turret 17 Die die 19 Lower turret 21 Servo motor 23 Ram 25 Striker 27 Laser processing unit 29 Laser machining head 31 Work moving part 39 Schedule registration part 41 Input part 43 Display part 45 Program storage part 47 Program creation part 49 Restriction timing prediction part 51 Machining order change part 53 Motor predicted temperature calculation part 55 Determination part

Claims (8)

A program creation device for creating a machining program for performing machining including punching on a plate-like workpiece by an electric punch press,
Based on the processing program, a regulation timing prediction unit that predicts the timing of hit rate regulation during operation of the punch press,
A program creation apparatus, comprising: a machining order changing unit that changes a machining order of the machining program so as to perform machining without hit rate regulation before timing at which hit rate regulation is applied. The punch press is a combined processing machine that performs punching and laser processing on a workpiece,
The machining order changing unit changes the machining order of the machining program so that another workpiece having the highest laser machining ratio is machined before a workpiece scheduled to be punched at a timing subject to hit rate regulation. The program creation device according to claim 1. The punch press is a combined processing machine that performs punching and laser processing on a workpiece,
The processing order changing unit changes the processing order of the processing program so that laser processing excluding outer periphery cutting processing is performed on the scheduled workpiece before timing at which hit rate regulation is applied. The program creation device according to claim 1.   The processing order changing unit performs punching with a small-diameter die instead of a large-diameter die on the scheduled workpiece before the hit rate regulation timing, or punching with a small punching resistance The program creation apparatus according to claim 1, wherein the machining order of the machining program is changed so as to perform the following. A processing order changing method for changing the processing order of a processing program for performing processing including punching on a plate-shaped workpiece by an electric punch press,
Based on the machining program, a regulation timing prediction step for predicting the timing of the hit rate regulation during operation of the punch press,
A processing order changing step for changing the processing order of the processing program so as to perform processing that does not require hit rate control after the end of the restriction timing prediction step and before the timing of hit rate control. How to change the processing order. The punch press is a combined processing machine that performs punching and laser processing on a workpiece,
In the machining order changing step, the machining order of the machining program is changed so that another workpiece having the highest laser machining ratio is machined before the workpiece scheduled to be punched at the timing when the hit rate is restricted. The processing order changing method according to claim 5, wherein: The punch press is a combined processing machine that performs punching and laser processing on a workpiece,
The processing order changing step is characterized in that the processing order of the processing program is changed so that laser processing excluding outer periphery cutting processing is performed on the scheduled workpiece before the timing of hit rate regulation. The processing order changing method according to claim 5. The processing sequence changing step, prior to the timing-consuming hit rate regulation, or perform punching in a mold of small diameter instead of the mold a large diameter relative to the scheduled work, or of the scheduled work 6. The processing order changing method according to claim 5, wherein the processing order of the processing program is changed so as to perform punch processing with a small punching resistance.

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