JP7145661B2 - Punch press and punch press control method - Google Patents

Description

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

2. Description of the Related Art Punch presses for manufacturing products of a predetermined shape by punching sheet metal with a punch and a die are widespread. A punch press has a motorized ram that moves up and down. The ram pushes down the punch with a striker, and the blade of the punch punches out the sheet metal sandwiched between the punch and the die.

JP-A-10-263900

In the sheet metal working 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 as not to apply an excessive load to the motor. This can reduce the risk of the motor overheating.

However, if a delay is provided in a series of machining steps to change the machining conditions, the machining quality of the product may change at unfavorable timing within one product. As a result, a low-quality product is produced in which the processing quality has changed during the process.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a punch press and a punch press control method capable of producing high-quality products while reducing the risk of overheating of the motor that moves the punch up and down.

The present invention comprises a punch holding section for holding a plurality of punches, a die holding section for holding a plurality of dies, and a set of punches and dies selected from the plurality of punches and the plurality of dies, which are vertically moved by a motor. a ram that pushes down the punch with a striker to punch a workpiece by a striker; a workpiece positioning mechanism that positions a portion of the workpiece to be punched to a position to be punched by the selected set of punches and dies; When manufacturing a product by punching using a plurality of sets of punches and dies based on the above, for each processing command using one set of punches and dies based on the processing program, the press speed when punching the work and once The time and press conditions until the next punch following the punching are set in advance, and under one press condition without changing the press condition during a continuous group of press working using one set of punch and die Control to press the workpiece, and at the timing of exchanging the set of punch and die according to the load applied to the motor, following the press speed or the one punch under the preset press conditions and a control device for controlling the work to be pressed under press conditions in which the time until the next punching is changed is provided.

According to the present invention, when a punch press manufactures a product by punching a workpiece using a plurality of sets of punches and dies based on a processing program, a set of punches and dies based on the processing program is used for each processing command. (2) setting the press conditions such as the press speed when punching the workpiece and the time from one punch to the next punch in advance, and manufacturing the product from the plurality of sets of punches and dies; A set of punches and dies is selected in turn, and said punches are pressed so as to press said workpiece under one press condition without changing the press conditions during a group of continuous pressing operations using one set of punches and dies. The press speed or the 1 Provided is a punch press control method for controlling the punch press so as to press the workpiece under press conditions in which the time from one punch to the next punch is changed.

According to the punch press and punch press control method of the present invention, it is possible to manufacture high-quality products while reducing the risk of overheating of the motor that moves the punch up and down.

It is a figure showing an example of whole composition of a punch press of one embodiment. It is a top view which shows an example of the product manufactured with the punch press of one Embodiment. FIG. 3 is a plan view showing an example of a method of punching a workpiece for manufacturing the product shown in FIG. 2; FIG. 4 is a diagram showing a control method when the punch press of one embodiment processes a plurality of works; FIG. 7 is a diagram showing a control method when the punch press of one embodiment processes the second and subsequent works. It is a figure which shows the control method of a comparative example. 4 is a flow chart showing a punch press control method of one embodiment. FIG. 8 is a flowchart showing specific processing of step S3 shown in FIG. 7; FIG. FIG. 9 is a flow chart showing specific determination processing of whether or not the press load is low in step S309 shown in FIG. 8. FIG. FIG. 9 is a flow chart showing specific determination processing as to whether or not the press load is low in step S312 shown in FIG. 8. FIG. FIG. 4 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 to the motor according to the vertical movement of the punch.

A punch press and a punch press control method according to one embodiment will be described below 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 comprises a frame 1. As shown in FIG. 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 punches P of different types are detachably attached to the upper turret 2 . A plurality of dies D of different types are detachably attached to the lower turret 3 . Therefore, the punch P and the die D attached to the upper turret 2 and the lower turret 3 are replaceable. The upper turret 2 is a punch holding section that holds a plurality of punches P, and the lower turret 3 is a die holding section that holds a plurality of dies D. As shown in FIG.

The frame 1 is provided with a ram 4 vertically movable by a motor 5 above the upper turret 2 . As the ram 4 moves up and down, the striker 6 also moves up and down. The position where the striker 6 moves up and down is the processing position for punching the workpiece W, which is a sheet metal to be processed. When the ram 4 and the striker 6 descend to 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 along the surface of the work W. The work positioning mechanism 11 includes a carriage base 12 that moves the work W in the Y-axis direction, a carriage 13 that has a clamper 14 that clamps the work W, and moves the work W in the X-axis direction. The work positioning mechanism 11 positions the portion of the work W to be punched at the processing position.

The NC device 20 controls machining 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 has a machining data acquisition section 21 , a data storage section 22 , a load determination section 23 and a press condition setting section 24 . Operations of the processing data acquisition unit 21 to the press condition setting unit 24 will be described later.

The turret punch press 100 processes a workpiece W to manufacture a desired product in the following manner. The NC unit 20 rotates the upper turret 2 and the lower turret 3 so as to position the punch P and the die D for punching the workpiece W into a predetermined shape specified by the machining program to the machining position where the striker 6 is positioned. Let In addition, the NC unit 20 controls the work positioning mechanism 11 to move the work W in the X-axis direction or the Y-axis direction in order to punch the work W at the position designated by the machining program in the plane of the work W. position.

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

FIG. 3 shows an example of how the work W is punched out by the punch P and the die D for manufacturing the product 30. As shown in FIG. As shown in FIG. 3, the turret punch press 100 uses a punch P having a circular blade and a die D corresponding thereto to punch out a circular region group G310 consisting of a plurality of circular regions 310. As shown in FIG. The turret punch press 100 uses a punch P having an elliptical blade and a die D corresponding thereto to punch out an elliptical region group G320 consisting of a plurality of elliptical regions 320 .

Further, the turret punch press 100 uses a punch P having rectangular blades for punching out rectangular regions 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 so that adjacent rectangular areas 331 to 333 overlap each other. Here, three types of sets of punches P and dies D are used to cut the outer shape of the product 30, but how many types of sets are used is a matter of design. Rectangular areas 331 to 333 overlapping each other are referred to as a product outline rectangular area group G330.

In the machining program for manufacturing the product 30, the machining order is set so that the circular area group G310 is first machined, then the elliptical area group G320 is machined, and finally the product outline rectangular area group G330 is machined. Suppose that In the machining program, a set of punch P and die D used for machining circular area group G310, elliptical area group G320, and product outline rectangular area group G330 is set. The NC device 20 controls the turret punch press 100 to sequentially select the punch P and the die D to be used in order to punch the workpiece W and manufacture the product 30 .

As shown in FIG. 4, the turret punch press 100 manufactures three products 30 from one work W by the punching method shown in FIG. 3, and processes a plurality of works W in order. One product 30 may be manufactured from one work W.

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

The press conditions include the press speed at which the punch P is lowered to punch the workpiece W, and the time from one punch to the next punch.

A machining program and material conditions are input to the machining data acquisition unit 21 of the NC device 20 . The machining data acquisition unit 21 acquires various kinds of machining data, which will be described later, when machining the first workpiece W, and the data storage unit 22 stores the machining data. The load determination 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 area of the product 30 to be processed has a large load on the motor 5 and which area of the product 30 to be processed has a small load on the motor 5. .

In FIGS. 4 to 6, the area where the workpiece W is machined with the load limited is indicated by broken lines, and the area where the workpiece W is machined with the load not limited is indicated by the solid line. As described above, the load is limited when processing the first workpiece W in FIG. It is shown.

In the circular region group G310, since the adjacent circular regions 310 are close to each other and the workpiece W moves in a short time, the press working can be continued in a short time. The same applies to the elliptical area group G320. On the other hand, in the product outline rectangular region group G330, the load applied to the motor 5 is small because the work W moves for a long time between each pressing.

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 that the processing of the product outline rectangular region group G330 has a low load. A machining program is input to the press condition setting unit 24, and the press condition setting unit 24 sets press conditions for each machining command based on the machining program. In FIG. 5, the press condition setting unit 24 sets press conditions that limit the load for the circular area group G310 and the elliptical area group G320, as indicated by broken lines, and sets the product outline rectangular area, as indicated by the solid lines. A press condition that does not limit the load is set for the group G330.

As shown in FIG. 4, the press condition setting unit 24 sets the press conditions shown in FIG. 5 for the second and subsequent works W. As shown in FIG. The NC unit 20 processes the second and subsequent works W with the load within the limit value in the circular region group G310 and the elliptical region group G320, and the load within the limit value in the product outline rectangular region group G330. The turret punch press 100 is controlled to process without limiting to .

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

When it is necessary to change the press conditions during the production of the product 30, the NC unit 20 operates the turret punch so as to change the press conditions at the timing of exchanging the mold according to the press conditions set in the press condition setting unit 24. Control the press 100 .

FIG. 6 is a comparative example, showing an example of changing press conditions during a group of continuous press working using one set of dies. In FIG. 6, it is assumed that the workpiece W is processed from top to bottom. The turret punch press 100 processes the workpiece W without restricting the load to manufacture the uppermost product 30, and shifts to the manufacture of the second product 30. - 特許庁

During the production of the second stage product 30, the turret punch press 100 completes the machining of the circular area group G310, and in the middle of machining the elliptical area group G320, the load applied to the motor 5 increases and the motor 5 stops working. Assume that there is a risk of overheating.

Therefore, as indicated by the dashed line, the NC unit 20 changes the press conditions to limit the load during processing of the elliptical region group G320, and also processes the product outline rectangular region group G330 under the press conditions with the load limited. The turret punch press 100 is controlled as follows. Subsequently, the turret punch press 100 produces the third product 30 under limited load press conditions.

In the processing of the elliptical region group G320 before the press condition change, the time from punching one elliptical region 320 to punching the next elliptical region 320 is the first time, and the delay is set after the press condition change. Suppose you insert a second time that is longer than the first time. After the punching of one elliptical region 320 is completed, the work W moves until the next elliptical region 320 is punched. , and the longer the time interval is, the less the in-plane shaking of the work W is.

The degree of in-plane sway of the work W affects the machining accuracy in the in-plane direction when punching the work W with a die. Therefore, as shown in FIG. 6, if a delay is inserted in the middle of machining the elliptical region group G320 to change the press conditions, the machining of the elliptical region 320 before the press condition change shown by the solid line and the press condition shown by the broken line The machining accuracy differs from the machining of the elliptical region 320 after the condition change.

Therefore, the elliptical aperture group G32 in the completed second-tier product 30 includes apertures 32 with different processing accuracies, resulting in a low-quality product 30 . Here, an example is given in which a delay is inserted in the middle of a group of continuous press working using one set of dies to change the press conditions, but the same is true when the press speed is changed.

On the other hand, the turret punch press 100 does not change the press conditions except at the timing of exchanging dies. Workpiece W is machined. Accordingly, turret punch press 100 is capable of producing 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 processing is started, the NC unit 20 determines in step S1 whether or not the first workpiece W is to be processed by a new processing program. If the first workpiece W is to be machined by the new machining program (YES), the NC unit 20 sets the press load set in the press condition setting unit 24 to within the limit value in step S2. , the machining of the first workpiece 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. The details of the product processing data will be described later.

On the other hand, if the first workpiece W is not machined by the new machining program in step S1 (NO), the NC unit 20 starts machining the second and subsequent workpieces W in step S4, and proceeds to step S5. set the variable j to 0. The NC device 20 determines whether or not the machining program has ended in step S6.

If the machining program has not ended (NO), the NC unit 20 determines in step S7 whether or not it has received a mold change command. If the die change command has not been received (NO), the NC unit 20 executes the program statement of the machining program in step S12, and returns the process to step S6. If the mold change command has been received (YES), the NC unit 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 processing 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, in the press condition setting unit 24, the press conditions are set in advance to limit the press load within the limit value. If the press load is not low at step S9 (NO), the press condition setting unit 24 maintains the press conditions at step S10 and shifts the process to step S12. If the press load is low (YES) in step S9, there is no need to limit the press load within the limit value. , and the process proceeds to step S12.

The NC unit 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 die, a press condition in which the press load is limited within the limit value and a press condition in which the press load is not limited within the limit value are selectively used to manufacture the product. If it is determined in step S6 that the machining program has ended (YES), the NC unit 20 ends the process.

FIG. 8 shows specific processing 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 machining data acquisition unit 21 stores the material type and plate thickness of the work W instructed by the machining program in the data storage unit 22. FIG. In step S303, the processing data acquisition unit 21 obtains the press load Tp[i] by the i-th mold, the press time Tt[i] by the i-th mold, and the i-th mold stored in the data storage unit 22. Clears the number of presses Tn[i], the machining time t[i], the number of presses n[i], and the variable i.

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

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

The processed data acquisition unit 21 determines whether or not the variable i is 1 in step S307. First, the processing data acquisition unit 21 determines that the variable i is 1 (YES), so in step S308, the current processing time t[1] and the current number of presses n[1] are stored in the data storage unit 21. , and the process proceeds to step S310.

When the processing data acquisition unit 21 receives the second and subsequent die exchange commands in step S305, the processing data acquisition unit 21 determines that the variable i is not 1 (NO) in step S307. 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 obtains the press time Tt[i−1] and the number of presses Tn. [i−1] is calculated and stored in the data storage unit 22 .

In the case where five types of molds 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 turn.

Furthermore, in step S309, the load determination unit 23 determines whether or not 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%×load due to only press operation/rated load of motor 5). The load due to press operation alone is the load due to the ram shaft operation of the ram 4 .

The processing of steps S305 to S310 is repeated until it is determined in step S304 that the machining program has ended.

If it is determined in step S304 that the machining program has ended (YES), the machining data acquisition unit 21 determines whether or not the variable i is 0 in step S311. If it is determined that the variable i is 0 (YES), the processed data acquisition unit 21 terminates the process. The fact that the variable i is 0 means that the machining program does not instruct machining of the workpiece W.

If the variable i is not determined to be 0 in step S311 (NO), the machining data acquisition unit 21 uses the current machining 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.

Furthermore, in step S312, the load determination unit 23 determines whether the press load Tp[i] is lower than the press time Tt[i] and the number of presses Tn[i]. , and terminate the process.

Whether or not the press load Tp[i-1] is low is determined in step S309 as shown in the flow chart of FIG. In FIG. 9, the load determination unit 23 determines whether or not the punching load is greater than 1% in step S3091. 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 cut surface circumference can be obtained from the command values of the machining program.

The load applied to the motor 5 is the sum of the load due to the press operation alone 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 determination unit 23 determines in step S3095 that the press load Tp[i−1] is not low, and performs the process. terminate. The threshold for ignoring the punching load is not limited to 1%.

If it is determined that the punching load is not greater than 1% in step S3091 (NO), the load determination unit 23 determines whether or not the time duty exceeds 80% in step S3092. In FIG. 11, the waveform indicated by (a) indicates changes in the vertical position of the punch P, and the waveform indicated by (b) indicates changes in the load applied to the motor 5. In FIG. A 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 determination unit 23 determines in step S3095 that the press load Tp[i−1] is not low, and terminates the process. Let If it is not determined in step S3092 that the time duty exceeds 80% (NO), the load determination unit 23 causes the process to proceed to step S3093.

The load determination unit 23 determines whether or not the time duty exceeds 60% in step S3093. If the time duty exceeds 60% (that is, if it exceeds 60% and is 80% or less), the load determination unit 23 determines in step S3096 that the press load Tp[i−1] is low and the press load is 110%. % can be set, and the process ends. If the time duty does not exceed 60% (NO), the load determination unit 23 causes the process to proceed to step S3094.

The load determination unit 23 determines whether or not the time duty exceeds 40% in step S3094. If the time duty exceeds 40% (that is, if it exceeds 40% and is 60% or less), the load determination unit 23 determines in step S3097 that the press load Tp[i−1] is low and the press load is 120%. % can be set, and the process ends. If the time duty does not exceed 40% (NO), the load determination unit 23 determines that the press load Tp[i-1] is low and the press load can be set to 150% in step S3098, and the process is started. terminate.

Thus, the smaller the time duty, the greater the press load can be, over 100%.

Whether or not the press load Tp[i] is low is determined in step S312 as shown in the flow chart of FIG. Steps S3121 to S3128 shown in FIG. 10 are similar to steps S3091 to S3098 in FIG. 9, and the press load Tp[i] is used instead of the press load Tp[i−1].

Returning to FIG. 7, the determination result in FIG. 9 or 10 is used to determine whether the press load is low in step S9. The determination result in FIG. 9 is used in the press working before the press working using the last die, and the determination result in FIG. 10 is used in the press working using the last die.

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

If it is determined that the press load Tp[i-1] or Tp[i] is low in FIG. 9 or 10, the press condition setting unit 24 changes the press conditions in step S11. If the 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 the press load can be set to 110% in FIG. 9 or 10, the press condition setting unit 24 changes the press conditions so that the press load is allowed up to 110%. The press condition setting unit 24 changes the press conditions to allow the press load up to 120% if it is determined that the press load can be set to 120%, and if it is determined that the press load can be set to 150% Change press conditions to allow press load up to 150%.

As described above, in the present embodiment, a press condition selected from a plurality of second press conditions is set. There may be only one second press condition, but 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 embodiments described above, and various modifications can be made without departing from the gist of the present invention. The present invention can also be applied to punch presses other than punch presses called turret punch presses.

REFERENCE SIGNS LIST 1 frame 2 upper turret 3 lower turret 4 ram 5 motor 6 striker 11 workpiece positioning mechanism 12 carriage base 13 carriage 14 clamper 20 NC unit 21 machining 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 holder that holds a plurality of punches;
a die holder that holds a plurality of dies;
a ram vertically moved by a motor to push down the punch by a striker so as to punch a workpiece with a set of punches and dies selected from the plurality of punches and the plurality of dies;
a workpiece positioning mechanism that positions the portion of the workpiece to be punched to a position to be processed by the selected set of punches and dies;
When the workpiece is punched using a plurality of sets of punches and dies based on the machining program to manufacture a product, and the workpiece is punched for each machining command using one set of punches and dies based on the machining program. and the time from one punch to the next punch are set in advance, and the press conditions are changed during a continuous group of press working using a set of punches and dies. The press speed under the preset press conditions or the press speed under the preset press conditions or the a control device for controlling the work to be pressed under press conditions in which the time from one punching to the next punching is changed;
Punch press with The control device is
a machining data acquisition unit for acquiring machining data when the product is manufactured by machining a first workpiece out of a plurality of workpieces in a state in which the load applied to the motor is limited within a predetermined limit value;
a data storage unit that stores the processed data;
a load determination unit that determines the degree of load applied to the motor when manufacturing one product based on the processing data;
Limiting the load applied to the motor within the limit value according to the degree of the load determined by the load determining unit when manufacturing the product by processing the second and subsequent workpieces among the plurality of workpieces. a press condition setting unit that selects and sets a first press condition that is set and a second press condition that does not limit the load applied to the motor within the limit value;
The punch press of claim 1, comprising: When a punch press manufactures a product by punching a workpiece using a plurality of sets of punches and dies based on a machining program, the workpiece is punched for each machining command using one set of punches and dies based on the machining program. Preset the press conditions of the press speed when punching and the time until the next punch following one punch,
sequentially selecting a set of punches and dies for manufacturing the product from the plurality of sets of punches and dies;
controlling the punch press so as to press the workpiece under one press condition without changing the press condition during a group of continuous press working using one set of punch and die;
According to the load applied to the motor for pressing down the punch and punching the workpiece, at the timing of exchanging the set of the punch and the die , following the press speed or the punching once under the preset press conditions A method of controlling a punch press, comprising: controlling the punch press so as to press the workpiece under press conditions in which the time until the next punch is changed. Acquiring processing data when the product is manufactured by processing a first work out of a plurality of works in a state where the load applied to the motor is limited within a predetermined limit value;
determining the degree of load applied to the motor when manufacturing one product based on the processing data;
a first press condition under which the load applied to the motor is limited within the limit value according to the degree of the load when the second and subsequent works of the plurality of works are processed to manufacture the product; and a second press condition that does not limit the load applied to the motor within the limit value.

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