JPH0484699A - Method for controlling hydraulic press driving device of punch press machine - Google Patents

Abstract

PURPOSE:To control a press stroke distance to an optimum value and to shorten the working time of the press by controlling the press driver in such a manner as to change the intermediate stop position and bottom dead point position of the stroke of a ram for the press in accordance with the computed values of the intermediate stop position and bottom dead point position of the stroke of the ram for the press of the punch press machine. CONSTITUTION:The intermediate stop position and bottom dead point position of the stroke of the ram for the press are computed by the thickness of a work and the amt. of shearing provided to each of a pair of plural pairs of dies 17 mounted to execute blanking inputted by the operation prior to the blanking of the work W at the time of driving the punch press machine equipped with the liquid pressure press driver LD designed to freely change the intermediate stop position and bottom dead point position of the stroke of the ram 3 for the press, a detector 5 for detecting the position of the ram for the press and the controller of the hydraulic press driving device. The hydraulic press driving device is then so controlled that the ram for the press attains the intermediate stop position and bottom dead point position of the ram based on the computed values in accordance with the signal from the detector and the computed values mentioned above at the time of the press blanking.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a hydraulic press drive device for a punch press machine that can reduce vibration and noise during punching and perform punching with high work efficiency. The present invention relates to a control method.

[Conventional technology]

Conventionally, in punch press machines that perform punching by a hydraulic press drive device, in order to reduce vibration and noise during punching, the stroke speed of the ram during the process of punching out a plate is changed to +I, and the processing machine has a large A control Jj method has been proposed in which the stroke speed is controlled to be slow in areas where vibration or noise is generated. (Japanese Unexamined Patent Publication No. 1839919/1983) A method of setting a shear angle on the mold as stage B to reduce vibration and noise during punching is known as a known technique, and is also used in punch press machines. There is.

[Problems to be Solved by the Invention] However, the method described in 1-1 above, which can reduce the noise when the mold and the liquid additive contact each other, has the problem that the stroke distance of the ram during punching is constant. Since the stroke speed for punching is constant, the stroke speed for punching is slower than that of conventional machines, resulting in a problem of lower work efficiency, as well as CΔ[)・CAM and pressure detection, which input and calculate experimental formulas. There is a problem in 171 that the equipment such as a machine and the feedback processing become complicated.5 Also, in the latter case in the prior art described in 5, the ram stroke speed of the punch press machine is constant, and The ram's stroke and loaf distance during punching is also constant, so in order to reduce noise when the die and workpiece come into contact, it is necessary to slow down the ram's speed, resulting in low work efficiency. In addition to this problem, there is also the problem that the shear amount is limited because the lower point of the ram stroke is always -.constant.

Therefore, despite being able to achieve higher work efficiency than conventional machines, there is less noise when the mold and liquid processed material come into contact, and the equipment and feedback processing are not large-scale, and vibration and noise during punching are reduced. It would be extremely useful if a control method for the hydraulic press drive device of a punch press machine could be developed that reduces the

[L Stage for Solving the Problems] The present invention has been made with the following objectives: 1) To provide a control method for a punch press machine that can solve the problems of the prior art, such as: Its configuration includes: a hydraulic press drive device that can freely change the press ram's slog intermediate stop 1-position and the bottom dead center position; a detection device that detects the position of the press ram; niI When driving a punch press machine equipped with a control device for controlling a hydraulic press drive device, before punching a workpiece, it is necessary to adjust the input liquid pressure to the thickness of the material, and The press punching process is performed by calculating the 1tr1 stop position 1 and the dead center position in the press ram using a shear acid installed in each of a pair or multiple pairs of molds installed to perform the punching process. At the time of I-, the signal from the detection device j and mj
The hydraulic press drive device is characterized by controlling the hydraulic press drive device according to the recorded value so as to cause the press ram to take an intermediate stop position and a bottom dead center position of the press ram based on the calculated value. It is something.

[For production]

The present invention is a method for controlling a hydraulic press drive device of a punch press machine, in which the intermediate part of the press ram is By calculating the stop 1 position and the bottom dead center position, and controlling the press drive device to change the strobe intermediate stop position and bottom dead center position of the press ram based on these calculated values, the press stroke distance can be calculated. The problems of the conventional technology are solved by controlling the pressure to an optimum value and shortening the pressing time.

〔Example〕

Next, an example of the implementation of the method of the present invention will be explained with the help of figures. 3゜Figure 1 shows the initial state of 11f1 in which the hydraulic press drive device applying the method of the present invention performs punching 1- on the liquid-filled material 1. In the hydraulic press drive system, S is a hydraulic cylinder 2, a piston 2a disposed in the cylinder, and a ram 3 connected to the pistons 2 and 1 and slidable in the vertical direction.
and a ram head 4 connected to the ram 3, and is attached to the main body frame 1 of the punch press machine so as to press the punch assembly PA in the eastward direction.

5 is a detection device that detects the strobe position of ram:3;
In this embodiment, a potentiometer is used, and the sliding direction of the ram 3 is made to be the same as the sliding direction of the detection rod 6, which is inserted into the detection device 5 described in 111j and is arranged to move forward and backward. Fixed to cylinder 2. .

A sensor head 7 is attached to the tip of the detection rod 6, and is urged in the direction by a spring 8 and comes into contact with a dog 9.

10 is a guide rod, 1lII] 11:, It is guided freely by the cylinder 2 only by sliding, and prevents the ram 3 from rotating simultaneously.
1-, and also acts to transmit the movement of the ram 3 in the vertical J-go direction to the dog 9.

11 is a connecting bracket for connecting the guide rod 1 (IYj) to the ram 3.

Reference numeral 12 denotes a punch turret, on which one or more pairs of punch assemblies PA are mounted, and is rotatably supported by the frame 1 by a bearing device (not shown) disposed on the main body frame 1.

Therefore, the punch assembly I) A is lifted upward by the gust post 14 installed upright on the punch turret 12, the return spring 15 guided by the guide post 14, and the tool lifter I3, and the upper limit position is at the head of the guide post 14. regulated.

A die turret 16 is provided with a die 17 that pairs with the punch assembly PA, and is rotatably supported by a bearing device (not shown) disposed on the main body frame 1.

W is a workpiece that is positioned between the punch assembly I) A and the die I7 and is punched.

FIG. 2 is a block diagram of the drive unit, its hydraulic circuit diagram, and control system of the above-mentioned hydraulic press drive device LD.
It is formed with an electromagnetic switching valve +9 connected to the first and second chambers A and F chamber B via piping circles 7 and PL.

20 is a /111 pressure press drive control unit that controls the plate thickness W↑ of the liquid adding material 1-material W input into the NC day 9 manipulator 21 and the selected position of the mold mounted on the punch turret 12. The punch 31 installed in the punch assembly PA installed at the position of the turret number
The intermediate stop position and bottom dead center position of the rams ′ and 3 during punching are calculated using the shear amount S provided on the cutting edge of the ram ′, and the detection data from the detection device 5 that detects the calculated values and the position of the ram 3 is calculated. 22 controls the electromagnetic switching valve I9. .

FIG. 3 shows the state in which the ram 3 is at the bottom dead center position. When the electromagnetic switching valve 19 is controlled and hydraulic oil is supplied to the chamber of the cylinder 2, the ram 3 descends. The punch assembly L) is pressed by the ram head 4 connected to the punch assembly L). .

The punch assembly 1) is lowered together with the tool lifter 13 against the spring 15, and the stopper 32 F of the punch assembly 1) comes into contact with the workpiece W. Due to the compressive deformation, the punch 31 is still lowered, and the cutting edge of the punch 31 enters the cutting edge of the die 17 to perform punching press work on the workpiece W. The position is detected by the detection device 5 and fed back to the hydraulic press drive control section 20.

At this time, the amount that the cutting edge fm of the punch 31 enters into the die 17 is the shear depth S + ITI provided on the cutting edge of the punch 31, as shown in FIG. 5, 1, where m is the shear depth. Liquid addition J: Distance from the bottom to the F plane of the material W, m
If the value is extremely large, the side surface of the cutting edge of the punch 31 will be worn quickly, and if it is made too small, the punched dregs will easily become abrasive. Therefore, it is desirable to adopt a constant value of m=l~:3mm, but the bottom dead center of the ram 3 should be set to a constant value of 3mm, where rn is I-, in line with the shah song S. There is a need to control. .

FIG. 4 shows the ram in the intermediate stop 11 position. When the ram 3 reaches the bottom dead center in the press step 1, the hydraulic press drive control unit 20 controls the electromagnetic switching valve 19 to supply hydraulic fluid to the chamber of the cylinder 2 and move the ram 3 to -1- The stopping position of the ram 3 at this time does not need to be returned to the initial state shown in FIG. It is only necessary to form it between the −1 plane of the die 17 and the 1ζ plane of the stripper 32.

In forming this space 12, in order to make the distance from the surface of the material W to the surface of the stripper 32 constant, the thickness W+ of the material W of the material W is used as a variable. Control.

In this way, by controlling the intermediate stop 1-position of ram 3, the intermediate stop position of ram 3 is not shown in Fig. 1, but is lower by distance #χ than the initial state (near position). , the punching operation for the next 41 using the same mold starts from this low position, and after the punching is completed as shown in Figure 3, 11)
and state 11 of the intermediate stop 1 position shown in FIG.

Here, the control operation of the hydraulic press drive device in the punch press machine of the embodiment to which the method of the present invention configured as described above is applied will be explained as follows.

That is, as a means to reduce vibration and noise during punching, a shear angle is provided in the die, and the punch turret 1 is
The ram 3 at the time of punching is determined by the turret number for selectively positioning the mold mounted on the turret number 2 and the shear amount S provided on the cutting edge of the punch 31 incorporated in the punch assembly PA mounted at the position of the turret number. By calculating and controlling the bottom dead center position of the ram 3, and further calculating and controlling the intermediate stop position of the ram 3 during punching according to the plate thickness Wt of the workpiece W, the press stroke distance can be optimally controlled and the press work time can be reduced. This makes it possible to shorten the time.

C Effects of the Invention The present invention is as described above, and includes a hydraulic press drive device that can freely change the stroke intermediate stop position and bottom dead center position of a press ram, and a detection device that detects the position of the press ram. The device and l]1J3c! H to control the hydraulic press drive
When driving a punch press machine equipped with an IJ suspension device, the thickness of the workpiece that is input before punching the workpiece, and the pair or pairs of pairs installed for punching the workpiece. The intermediate stop position and bottom dead center position of the press ram are calculated based on the shear amount provided in each of the molds, and when press punching is performed, the signal from the detection device and the calculated value are used to calculate 1> ? In order to control the hydraulic press drive so that the press ram described in 1) takes the intermediate stop position and bottom dead center position of the press ram based on the calculated value in 11, It reduces vibration and noise during punching, and controls the press stroke to an optimal value, so it can be operated as a highly efficient sheet metal processing machine.

[Brief explanation of the drawing]

Fig. 1 is a front sectional view showing the initial state before the hydraulic press drive device driven by the invention method performs punching on the workpiece, and Fig. 2 is the hydraulic circuit in the drive device of Fig. 1. and a block diagram of the control system. Figure 3 is a front cross-sectional view of the drive device shown in Figure 1 with the ram at the bottom dead center position. Figure 4 is a front cross-section of the drive device shown in Figure 1 with the ram at the intermediate stop position. figure,
FIG. 5 is an enlarged sectional view of the main part of FIG. 3.

Claims (1)

[Claims] A hydraulic press drive device that can freely change the stroke intermediate stop position and bottom dead center position of a press ram, a detection device that detects the position of the press ram, and a control device that controls the hydraulic press drive device. When operating a punch press machine equipped with The intermediate stop position and bottom dead center position of the press ram are calculated based on the shear amount provided in each of the molds, and during press punching, the press ram is Control of a hydraulic press drive device of a punch press machine, characterized in that the hydraulic press drive device is controlled so that the press ram takes an intermediate stop position and a bottom dead center position based on the calculated value. Method.