JP2020006382A - Punch press and control method of punch press - Google Patents

Abstract

To provide a punch press by which a high-quality product can be manufactured while reducing a risk of the overheat of a motor for vertically moving punches.SOLUTION: A ram 4 is vertically moved by a motor 5, and punches P are pressed down by a striker 6 for punching a workpiece W by a plurality of the punches P, one set of the punches selected from a plurality of dies D, and the dies D. A workpiece positioning mechanism 11 positions a punched portion of the workpiece W to a processing position by one set of the selected punches P and the dies D. When manufacturing a product by punching the workpiece W by using a plurality of sets of the punches P and the dies D, a control device (NC device 20) sets one press condition without changing a press condition in the middle of the press-processing of a continuous group using one set of the punches P and the dies D, and controls the processing of the workpiece W so as to change the press condition at timing for exchanging a set of the punches P and a set of the dies D according to a load applied to the motor 5.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a punch press and a punch press control method.

  2. Description of the Related Art Punch presses for punching a sheet metal with a punch and a die to produce a product having a predetermined shape are widely used. The punch press includes a ram that has a motor and moves up and down. The ram pushes down the punch with the striker, and punches the sheet metal sandwiched between the punch and the die with the blade of the punch.

JP-A-10-263900

  In the sheet metal processing process, if an excessive load is applied to the motor, the motor may overheat. Therefore, in Patent Document 1, a delay is provided when the punch is lowered by the ram so that an excessive load is not applied to the motor. This can reduce the possibility that the motor will overheat.

  However, if a processing condition is changed by providing a delay in a series of processing steps, the processing quality of a product may change at an undesired timing within one product. Then, a low-quality product in which the processing quality changes on the way is produced.

  An object of the present invention is to provide a punch press and a punch press control method capable of producing a high-quality product while reducing the risk of overheating of a motor that moves a punch up and down.

  The present invention relates to a punch holding unit that holds a plurality of punches, a die holding unit that holds a plurality of dies, and a set of punches and dies that are moved up and down by a motor and selected from the plurality of punches and the plurality of dies. A ram that presses down the punch by a striker to punch the workpiece by a striker, a work positioning mechanism that positions a punched portion of the work at a processing position by the selected set of punches and dies, and a plurality of sets of the work. When manufacturing a product by punching using a punch and a die, one press condition is set without changing the press conditions during a continuous group of press working using a set of punches and a die, In accordance with the load applied to the motor, the work conditions of the work are changed so that the press conditions are changed at the time of exchanging the set of punch and die. Providing a punch press and a control device for controlling the.

  The present invention sequentially selects a set of punches and dies for manufacturing a product by punching a workpiece from a plurality of sets of punches and dies, and performs a continuous group of press working using one set of punches and dies. One press condition is set without changing the press condition in the middle of the process, and according to the load on the motor for punching down the punch by pressing down the punch, the press condition is changed at the timing of exchanging the set of punch and die. A method for controlling a punch press to be changed is provided.

  ADVANTAGE OF THE INVENTION According to the punch press and the control method of a punch press of this invention, a high quality product can be manufactured, reducing the possibility that the motor which moves a punch up and down may overheat.

It is a figure showing the example of whole composition of the punch press of one embodiment. It is a top view showing an example of the product manufactured by the punch press of one embodiment. FIG. 3 is a plan view illustrating an example of a method of punching a work for manufacturing the product illustrated in FIG. 2. FIG. 4 is a diagram illustrating a control method when the punch press of one embodiment processes a plurality of works. FIG. 6 is a diagram illustrating a control method when the punch press of one embodiment processes a second or subsequent work. It is a figure showing the control method of the comparative example. 4 is a flowchart illustrating a method for controlling a punch press according to an embodiment. 8 is a flowchart showing a specific process of step S3 shown in FIG. 9 is a flowchart illustrating a specific determination process of determining whether or not a press load is low in step S309 illustrated in FIG. 8. 9 is a flowchart illustrating a specific determination process of determining whether or not a press load is low in step S312 illustrated in FIG. 8. FIG. 7 is a waveform diagram showing a load period during which a load is applied to the motor and a non-load period during which no load is applied, according to the vertical movement of the punch.

  Hereinafter, a punch press and a method of controlling the punch press according to an embodiment will be described with reference to the accompanying drawings. The punch press of one embodiment shown in FIG. 1 is a turret punch press which is an example of a punch press.

  In FIG. 1, a turret punch press 100 includes a frame 1. The frame 1 includes an upper turret 2 that is vertically movable and rotatably provided, and a lower turret 3 that is rotatably provided. A plurality of different types of punches P are detachably mounted on the upper turret 2. A plurality of dies D of different types are detachably mounted on the lower turret 3. Therefore, the punch P and the die D mounted on the upper turret 2 and the lower turret 3 are interchangeable. The upper turret 2 is a punch holding unit that holds a plurality of punches P, and the lower turret 3 is a die holding unit that holds a plurality of dies D.

  The frame 1 is provided above the upper turret 2 with a ram 4 which can be moved up and down by a motor 5. The striker 6 also moves up and down by the up and down movement of the ram 4. The position at which the striker 6 moves up and down is the processing position where the workpiece W, which is the sheet metal to be processed, is punched. When the ram 4 and the striker 6 descend and push down the punch P, the work W sandwiched between the punch P and the die D is punched by the blade of the punch P.

  The turret punch press 100 includes a work positioning mechanism 11 for moving and positioning the work W to a predetermined position in the X-axis direction or the Y-axis direction which is a direction along the surface of the work W. The work positioning mechanism 11 includes a carriage base 12 for moving the work W in the Y-axis direction, and a carriage 13 having a clamper 14 for clamping the work W and moving the work W in the X-axis direction. The work positioning mechanism 11 positions a punched portion of the work W at a processing position.

  The NC device 20 controls the processing of the work W by the turret punch press 100. The NC device 20 is an example of a control device that controls the turret punch press 100. The NC device 20 includes a processing data acquisition unit 21, a data storage unit 22, a load determination unit 23, and a press condition setting unit 24. The operation of the processing data acquisition unit 21 to the press condition setting unit 24 will be described later.

  The turret punch press 100 processes the work W to produce a predetermined product as follows. The NC device 20 rotates the upper turret 2 and the lower turret 3 so that the punch P and the die D for punching the workpiece W in a predetermined shape specified by the processing program are located at the processing position where the striker 6 is located. Let it. In addition, the NC device 20 controls the work positioning mechanism 11 to punch the work W at a position specified by the machining program in the plane of the work W, and moves the work W in the X-axis direction or the Y-axis direction. Position.

  The operation of the turret punch press 100 and the control method of the turret punch press 100 will be described by taking as an example a case where the turret punch press 100 manufactures the product 30 shown in FIG. The product 30 has a circular opening group G31 including a plurality of circular openings 31 and an elliptical opening group G32 including a plurality of elliptical openings 32.

  FIG. 3 shows an example of a method of punching a workpiece W by a punch P and a die D to manufacture the product 30. As shown in FIG. 3, the turret punch press 100 uses a punch P having a circular blade and a die D corresponding to the punch P to punch out a circular area group G310 including a plurality of circular areas 310. The turret punch press 100 punches out an elliptical area group G320 including a plurality of elliptical areas 320 using a punch P having an elliptical blade and a die D corresponding thereto.

  Further, the turret punch press 100 uses a punch P having a rectangular blade for punching out the rectangular areas 331 to 333 and a die D corresponding thereto in order to cut the outer shape of the product 30. The turret punch press 100 punches the workpiece W such that adjacent rectangular areas 331 to 333 overlap each other. Here, three types of punches P and dies D are used to cut the outer shape of the product 30, but how many types are used is a matter of design. The rectangular areas 331 to 333 overlapping each other are referred to as a product external rectangular area group G330.

  In the processing program for manufacturing the product 30, the processing order is set so that the circular area group G310 is processed first, then the elliptical area group G320 is processed, and finally the product external rectangular area group G330 is processed. It is assumed that it is. In the processing program, a set of a punch P and a die D used for processing the circular area group G310, the elliptical area group G320, and the product outer rectangular area group G330 is set. The NC device 20 controls the turret punch press 100 so as to sequentially select the punches P and the dies D to be used in order to manufacture the product 30 by punching the workpiece W.

  As illustrated in FIG. 4, an example is described in which the turret punch press 100 manufactures three products 30 from a single work W by the punching method illustrated in FIG. 3 and sequentially processes a plurality of works W. One product 30 may be manufactured from one work W.

  When processing the first workpiece W, the NC device 20 processes the workpiece W in a state where the press load is limited within a predetermined limit value so that the load applied to the motor 5 falls within the rating of the motor 5. The turret punch press 100 is controlled. In the press condition setting unit 24, a press condition in which a press load when processing the first work W is limited to a limit value or less is set by a user setting. The NC device 20 controls the turret punch press 100 to process the work W in accordance with the press conditions set in the press condition setting unit 24.

  The pressing conditions include a pressing speed at the time of punching the workpiece W by lowering the punch P, and a time period from one punching to the next punching.

  A processing program and material conditions are input to the processing data acquisition unit 21 of the NC device 20. When processing the first work W, the processing data obtaining unit 21 obtains various processing data described later, and the data storage unit 22 stores the processing data. The load determining unit 23 determines the degree of load applied to the motor 5 when manufacturing one product 30 based on the processing data. Specifically, the load determination unit 23 determines which region of the product 30 is to be processed with a large load on the motor 5 and which region of the product 30 is to be processed with a small load on the motor 5. .

  4 to 6, a region where the work W is processed in a state where the load is limited is indicated by a broken line, and a region where the work W is processed in a state where the load is not limited is indicated by a solid line. As described above, since the load is limited when the first workpiece W is processed in FIG. 4, all of the circular area group G310, the elliptical area group G320, and the product outer rectangular area group G330 are indicated by broken lines. It is shown.

  In the circular area group G310, the distance between the adjacent circular areas 310 is short and the moving time of the work W is short, so that the press working is continued in a short time, and since a large number of circular areas 310 are included, the load on the motor 5 is large. The same applies to the elliptical region group G320. On the other hand, in the product outline rectangular area group G330, the load applied to the motor 5 is small because the movement time of the work W is long between press workings.

  The load determination unit 23 determines that the processing of the circular region group G310 and the elliptical region group G320 has a high load, and the processing of the product external rectangular region group G330 has a low load. A processing program is input to the press condition setting unit 24, and the press condition setting unit 24 sets a press condition for each processing command based on the processing program. In FIG. 5, the press condition setting unit 24 sets the press condition in which the load is limited for the circular region group G310 and the elliptical region group G320 as indicated by the broken line, and the product outer rectangular region as indicated by the solid line. Press conditions that do not limit the load are set for the group G330.

  As shown in FIG. 4, the press condition setting unit 24 sets the press conditions shown in FIG. The NC device 20 processes the second and subsequent workpieces W in a state where the load is limited to within the limit value in the circular region group G310 and the elliptical region group G320, and the load is within the limit value in the product outer rectangular region group G330. The turret punch press 100 is controlled so as to perform processing in a state not limited to.

  The press condition setting unit 24 sets one press condition without changing the press condition in the middle of a continuous group of press working using one set of dies including the punch P and the die D. . Therefore, as shown in FIG. 4 or FIG. 5, the turret punch press 100 processes the work W under one press condition in a continuous group of press processes using one set of dies.

  When it is necessary to change the pressing conditions during the manufacture of the product 30, the NC device 20 changes the pressing conditions at the timing of exchanging the mold according to the pressing conditions set in the pressing condition setting unit 24. The press 100 is controlled.

  FIG. 6 is a comparative example, and shows an example in which pressing conditions are changed in the middle of a continuous group of press working using one set of dies. In FIG. 6, it is assumed that the workpiece W is processed from above to below. The turret punch press 100 processes the work W in a state where the load is not limited, manufactures the uppermost product 30, and shifts to manufacturing the second-stage product 30.

  During the manufacture of the second stage product 30, the turret punch press 100 completes the processing of the circular area group G310, and the load on the motor 5 increases during the processing of the elliptical area group G320, and the motor 5 It is assumed that overheating may occur.

  Therefore, as shown by the broken line, the NC device 20 changes the pressing condition so as to limit the load during the processing of the elliptical region group G320, and also processes the product outer rectangular region group G330 under the pressing condition with the limited load. Thus, the turret punch press 100 is controlled. Subsequently, the turret punch press 100 manufactures the third-stage product 30 under press conditions with a limited load.

  In the processing before the pressing condition change of the elliptical region group G320, the time from the punching of one elliptical region 320 to the punching of the next elliptical region 320 is the first time. Assume that a second time longer than the first time is inserted. After the punching of one elliptical area 320 is completed, the workpiece W moves until the next elliptical area 320 is punched, and the shorter the time interval between the punching of the two elliptical areas 320, the more the workpiece W moves in the plane. The longer the time interval is, the more the work W is shaken in the in-plane direction.

  The degree of shaking of the work W in the in-plane direction affects the processing accuracy in the in-plane direction when the work W is punched with a die. Accordingly, as shown in FIG. 6, when the pressing condition is changed by inserting a delay during the processing of the elliptical region group G320, the processing of the elliptical region 320 before the pressing condition change indicated by the solid line and the press indicated by the broken line are performed. The processing accuracy differs from the processing of the elliptical region 320 after the condition change.

  Therefore, in the elliptical opening group G32 in the completed second-stage product 30, the openings 32 having different processing precisions are mixed, and the low-quality product 30 is obtained. Here, an example is described in which a delay is inserted in the middle of a continuous group of press workings using one set of dies to change the pressing conditions, but the same applies when the pressing speed is changed.

  On the other hand, the turret punch press 100 does not change the press conditions except for the timing of exchanging the dies, and in a continuous group of press working using one set of the dies, the turret punch press 100 uses only one press condition. Work W is processed. Therefore, the turret punch press 100 can produce a high-quality product 30.

  A specific control method of the turret punch press 100 by the NC device 20 will be described with reference to the flowchart shown in FIG. In FIG. 7, when the process is started, the NC device 20 determines in step S1 whether or not the first work W is processed by a new processing program. If the first workpiece W is processed by the new processing program (YES), the NC device 20 determines in step S2 that the press load set in the press condition setting unit 24 is limited to a value within the limit value. Then, the processing of the first work W is started.

  In step S3, the processed data acquisition unit 21 and the data storage unit 22 acquire and store the processed data of the product, and terminate the process. Details of the product processing data will be described later.

  On the other hand, if it is not the processing of the first work W by the new processing program in step S1 (NO), the NC device 20 starts processing the second and subsequent works W in step S4, and proceeds to step S5. To set the variable j to 0. In step S6, the NC device 20 determines whether the machining program has been completed.

  If the machining program has not been completed (NO), the NC device 20 determines in step S7 whether or not a mold replacement command has been received. If the die exchange command has not been received (NO), the NC device 20 executes the program statement of the machining program in step S12, and returns the processing to step S6. If the die exchange command has been received (YES), the NC device 20 adds 1 to the variable j in step S8.

  In step S9, the load determination unit 23 refers to the product processing data stored in the data storage unit 22 and determines whether the press load of the press working by the die used in the next processing command is low. judge. A specific method for determining whether the press load is low will be described later.

  As described above, the press condition in which the press load is limited within the limit value is set in the press condition setting unit 24 in advance. If the pressing load is not low in step S9 (NO), the pressing condition setting unit 24 maintains the pressing conditions in step S10, and shifts the processing to step S12. If the press load is low in step S9 (YES), it is not necessary to limit the press load to within the limit value, so the press condition setting unit 24 determines in step S11 that the press load does not limit the press load to within the limit value. Is changed so as to set, and the process proceeds to step S12.

  The NC device 20 repeats the processing of steps S7 to S12 until it determines in step S6 that the machining program has ended. Therefore, in the press working using each mold, a product is manufactured by selectively using a press condition in which the press load is limited to within the limit value and a press condition in which the press load is not limited to the limit value. If it is determined in step S6 that the machining program has ended (YES), the NC device 20 ends the processing.

  FIG. 8 shows a specific process of step S3. In step S301, the press condition setting unit 24 sets 100% as an example of the limit value of the press load. In step S302, the processing data acquisition unit 21 causes the data storage unit 22 to store the material type and plate thickness of the work W specified by the processing program. In step S303, the processing data acquisition unit 21 stores the press load Tp [i] of the i-th mold, the press time Tt [i] of the i-th mold, and the i-th press stored in the data storage unit 22. The number of presses Tn [i], the processing time t [i], the number of presses n [i], and the variable i are cleared.

  In step S304, the processing data acquisition unit 21 determines whether the processing program has been completed. If it is not determined that the machining program has been completed (NO), the machining data acquisition unit 21 receives the machining data in step S305 to determine whether or not a mold replacement command has been received. If the die exchange command has not been received (NO), the NC device 20 executes the program statement of the machining program in step S310, and returns the process to step S304.

  If a die exchange command has been received in step S305 (YES), the processing data acquisition unit 21 adds 1 to a variable i (here, 0) in step S306.

  The processing data acquisition unit 21 determines whether the variable i is 1 in Step S307. First, since the processing data acquisition unit 21 determines that the variable i is 1 (YES), in step S308, the current processing time t [1] and the current number of presses n [1] are stored in the data storage unit 22. And the process proceeds to step S310.

  When the machining data acquisition unit 21 receives the second and subsequent mold replacement commands in step S305, the machining data acquisition unit 21 determines in step S307 that the variable i is not 1 (NO). In step S309, the processing data acquisition unit 21 stores the current processing time t [i] and the current number of presses n [i] in the data storage unit 22, and performs the press time Tt [i-1] and the number of presses Tn. [i-1] is calculated and stored in the data storage unit 22.

  Taking the case where five types of dies are used as an example, in step S309, Tt [1] = t [2] -t [1] and Tn [1] = n [2] -n [1]. , Tt [2] = t [3] -t [2] and Tn [2] = n [3] -n [2], Tt [3] = t [4] -t [3] and Tn [3] = N [4] -n [3], Tt [4] = t [5] -t [4] and Tn [4] = n [5] -n [4] are obtained in order.

  Further, in step S309, the load determining unit 23 determines whether the press load Tp [i-1] is lower than the press time Tt [i-1] and the number of presses Tn [i-1]. The result is stored in the data storage unit 22, and the process proceeds to step S310. The press load is obtained by 100% × the load due to only the press operation プ レ ス the rated load of the motor 5. The load caused only by the pressing operation is the load caused by the ram axis operation by the ram 4.

  Until it is determined in step S304 that the machining program has been completed, the processing in steps S305 to S310 is repeated.

  If it is determined in step S304 that the machining program has been completed (YES), the machining data acquisition unit 21 determines whether the variable i is 0 in step S311. If it is determined that the variable i is 0 (YES), the processing data acquisition unit 21 ends the processing. The fact that the variable i is 0 means that the machining program does not instruct machining of the work W.

  If it is not determined in step S311 that the variable i is 0 (NO), the processing data acquisition unit 21 uses the current processing time t [e] and the current number of presses n [e] in step S312. Then, the press time Tt [i] and the number of presses Tn [i] are calculated and stored in the data storage unit 22.

  When five types of molds are used, Tt [5] = t [e] -t [5] and Tn [5] = n [e] -n [5] are obtained in step S312.

  Further, in step S312, the load determination unit 23 determines whether or not the press load Tp [i] is lower than the press time Tt [i] and the number of presses Tn [i], and determines the determination result in the data storage unit 22. And the process is terminated.

  In step S309, whether the press load Tp [i-1] is low is determined as in the flowchart shown in FIG. 9, in step S3091, the load determination unit 23 determines whether the punching load is greater than 1%. The punching load is a load obtained by multiplying the shear resistance of the work W obtained based on the material type of the work W, the plate thickness, and the circumference of the cut surface. The shear resistance, plate thickness, and perimeter of the cut surface can be obtained from command values of the machining program.

  The load applied to the motor 5 is a load obtained by combining the load due to only the press operation and the punching load. If the punching load is greater than 1%, the punching load cannot be ignored. Therefore, if it is determined in step S3091 that the punching load is greater than 1% (YES), the load determining unit 23 determines in step S3095 that the press load Tp [i-1] is not low, and performs processing. To end. The threshold for ignoring the punching load is not limited to 1%.

  If it is not determined in step S3091 that the punching load is greater than 1% (NO), the load determination unit 23 determines in step S3092 whether the time duty exceeds 80%. In FIG. 11, the waveform shown in (a) shows a change in the vertical position of the punch P, and the waveform shown in (b) shows a change in the load applied to the motor 5. The load is applied to the motor 5 during the load period, and no load is applied to the motor 5 during the non-load period. The time duty is a value represented by load period / (load period + non-load period).

  If it is determined in step S3092 that the time duty exceeds 80% (YES), the load determining unit 23 determines in step S3095 that the press load Tp [i-1] is not low, and ends the processing. Let it. If it is not determined in step S3092 that the time duty exceeds 80% (NO), the load determining unit 23 shifts the processing to step S3093.

  In step S3093, the load determination unit 23 determines whether the time duty exceeds 60%. If the time duty exceeds 60% (that is, if it exceeds 60% and is equal to or less than 80%), in step S3096, the load determination unit 23 determines that the press load Tp [i-1] is low and the press load is It is determined that the value can be set to%, and the process is terminated. If the time duty does not exceed 60% (NO), the load determining unit 23 shifts the processing to Step S3094.

  In step S3094, the load determination unit 23 determines whether the time duty exceeds 40%. If the time duty exceeds 40% (that is, if it exceeds 40% and is equal to or less than 60%), in step S3097, the load determination unit 23 determines that the press load Tp [i−1] is low and the press load is It is determined that the value can be set to%, and the process is terminated. If the time duty does not exceed 40% (NO), the load determining unit 23 determines in step S3098 that the press load Tp [i-1] is low and the press load can be set to 150%, and the processing is performed. Terminate.

  Thus, as the time duty becomes smaller, the press load can be made larger than 100%.

  In step S312, it is determined whether the press load Tp [i] is low as shown in the flowchart of FIG. Steps S3121 to S3128 shown in FIG. 10 are the same as steps S3091 to S3098 in FIG. 9, and are replaced by a press load Tp [i] instead of the press load Tp [i-1].

  Returning to FIG. 7, the determination in step S9 as to whether the press load is low uses the determination result in FIG. 9 or FIG. In the press working before the press using the last mold, the determination result in FIG. 9 is used, and in the press working using the last mold, the determination result in FIG. 10 is used.

  If it is determined in FIG. 9 or FIG. 10 that the press load Tp [i−1] or Tp [i] is not low, the press condition setting unit 24 maintains the press conditions in step S10. If the press condition in which the preset load is limited within the limit value is set as the first press condition, the press condition setting unit 24 selects and sets the first press condition.

  If it is determined in FIG. 9 or FIG. 10 that the press load Tp [i-1] or Tp [i] is low, the press condition setting unit 24 changes the press condition in step S11. If a press condition that does not limit the newly set load within the limit value is set as the second press condition, the press condition setting unit 24 selects and sets the second press condition.

  Specifically, if it is determined in FIG. 9 or FIG. 10 that the press load can be set to 110%, the press condition setting unit 24 changes the press condition so as to allow the press load to 110%. If it is determined that the press load can be set to 120%, the press condition setting unit 24 changes the press condition to allow the press load to 120%, and if it is determined that the press load can be set to 150%. Press conditions are changed to allow a press load of up to 150%.

  As described above, in the present embodiment, a press condition selected from a plurality of second press conditions is set. Although only one second press condition may be used, it is preferable that a plurality of second press conditions are set according to the time duty.

  The present invention is not limited to the present embodiment described above, and can be variously modified without departing from the gist of the present invention. The present invention can be applied to a punch press other than a punch press called a turret punch press.

Reference Signs List 1 frame 2 upper turret 3 lower turret 4 ram 5 motor 6 striker 11 work positioning mechanism 12 carriage base 13 carriage 14 clamper 20 NC device 21 processing data acquisition unit 22 data storage unit 23 load determination unit 24 press condition setting unit 100 turret punch press D Die P Punch W Work

Claims (4)

A punch holding unit for holding a plurality of punches,
A die holding unit for holding a plurality of dies,
A ram that moves up and down by a motor and presses down the punch with a striker to punch out a workpiece with a set of punches and dies selected from the plurality of punches and a plurality of dies;
A work positioning mechanism for positioning a portion to be punched of the work at a processing position by the selected set of punches and dies;
When punching the work using a plurality of sets of punches and dies to produce a product, a single group of presses using one set of punches and dies can be used without changing the pressing conditions during a continuous group of press working. A control device for controlling the processing of the work, wherein the press conditions are set, and according to the load applied to the motor, the press conditions are changed at a timing of exchanging a set of punch and die.
Punch press equipped with. The control device includes:
A processing data obtaining unit configured to obtain processing data when a product is manufactured by processing a first work of a plurality of works in a state where a load applied to the motor is limited to a predetermined limit value;
A data storage unit that stores the processing data,
A load determining unit that determines a degree of a load applied to a motor when manufacturing one product based on the processing data;
When manufacturing a product by processing the second and subsequent workpieces of the plurality of workpieces, the load applied to the motor is limited to within the limit value according to the degree of load determined by the load determination unit. A press condition setting unit that selects and sets a first press condition and a second press condition that does not limit the load applied to the motor within the limit value;
The punch press according to claim 1, further comprising: Punch and die pairs for punching a work out of a plurality of pairs of punches and dies to produce a product are selected in order,
One press condition is set without changing the press condition in the middle of a continuous group of press working using one set of punch and die,
A method of controlling a punch press, wherein press conditions are changed at a timing of exchanging a set of a punch and a die in accordance with a load applied to a motor for punching the work by pressing down the punch. In a state where the load applied to the motor is limited within a predetermined limit value, processing data obtained when a product is manufactured by processing a first work of a plurality of works,
Based on the processing data, determine the degree of load on the motor when manufacturing one product,
When manufacturing a product by processing the second and subsequent workpieces of the plurality of workpieces, depending on the degree of the load, a first pressing condition in which a load applied to the motor is limited to within the limit value, The punch press control method according to claim 3, wherein a second press condition that does not limit the load on the motor within the limit value is selected.

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