JPH01148498A - Stroke control method for press machine - Google Patents

Abstract

PURPOSE:To enable a highly efficient work by low vibration/low noise by automatically producing an optimum working pattern from the data of the cylinder pressure of punching time in trial punching and the lift position thereof. CONSTITUTION:A plate stock 1 is tentatively subjected to blanking at specified speed by the punch 3 of the cylinder type press machine capable of variably controlling the stroke speed. The pressure P of a cylinder 7 at the blanking time thereof is detected by a detector 19. A working pattern producing part 27 reads the surface position of the plate stock 1 from the position of the punch 3 of the rise time of said pressure P, reading the max. blanking pressure thereafter as well and storing these data. The working pattern attaining smaller vibration/noise and high efficiency is produced from these data and a servovalve 15 is controlled by this pattern.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a method for controlling the stroke of a press machine that allows punching to be performed with low vibration or noise and with high efficiency.

(Prior Art) As shown in Japanese Patent Application Laid-Open No. 183910/1983 (Stroke Control Method for Plate Material Processing Machine), in the punching process of a press machine, extremely large vibrations or ji!
A sound is generated.

For example, in an experiment with a turret punch press, the vibration was approximately 75d3 at a position 1m away from the punch center, and 10
At a position Ill away, it is about 58d[3, and the relationship between distance and vibration is approximately linear.

Also, the noise is 10m ft from the punch center! Approximately 98dB at a close position, 75dB at a distance of 40m+
The relationship between the distance and the noise is also approximately linear.

These vibrations or noises occur during the operation of the stroke actuating part.
This occurs between the stroke actuating part and the plate material, or due to bending of the frame, etc., and the faster the stroke speed, the greater the amount.

On the other hand, according to the environmental regulation standards, the vibration regulation values in Tokyo, for example, are set at night (
PM7: 00 to AM8: 00) 60 dB, daytime (AM8: 00 to PM 7: 00) 65 dB, and in industrial areas, nighttime 65 d [between 3 and 7
It is 0dB. In addition, the noise level υ) value in Tokyo is 45 dB at night and 50 dB during the day in Type 1 residential areas, 45 dB at night and 50 dB during the day in Type 2 residential areas, and 50 to 55 dB at night in semi-industrial areas. 60dB between B and N, 55-60dB at night in industrial areas,
It is 70 dB during the day.

Therefore, the use of plate processing machines, especially press machines, that have stroke operating parts is severely restricted in terms of time and region, and in areas with strict regulations, large-scale vibration-proofing and sound-proofing devices have to be attached. situation.

Therefore, the above-mentioned publication discloses a technique for optimizing the punching speed and performing processing with low vibration or noise and high efficiency.

(Problems to be Solved by the Invention) However, the principle of generation of vibration or noise during punching is complex, and the only way to find an appropriate value for the punching speed is through experiment. Therefore, conventionally, the appropriate value of the punching speed has been determined for each type, plate thickness, and shape of the workpiece, or by experimental punching for each work unit. Therefore, in the past, it took a lot of effort and time to generate the appropriate speed, which lowered the overall work efficiency.

Therefore, the present invention is based on the knowledge that the amount of vibration or noise is approximately determined by the punching pressure, and it is possible to easily generate a suitable Everturn with low motion or noise and high efficiency. The purpose of this invention is to provide a method for controlling a press machine that can improve work efficiency.

[Structure of the Invention] (Means for Solving the Problems) The present invention for solving the above problems provides a stroke control method for a cylinder press machine whose stroke speed can be variably controlled. Test punching at a high speed, and automatically generate a machining pattern that enables highly efficient punching of the workpiece with a desired vibration or noise value from data on cylinder pressure and its vertical position during punching,
It is characterized by stroke control using the generated machining pattern.

(Function) According to the present invention, since an appropriate machining pattern is automatically generated in a trial punching operation, work efficiency is improved.

(Example) FIG. 1 is an explanatory diagram of a model of a cylinder press machine and its control device.

As shown in the figure, a punch 3 and a die 5 are disposed above and below a plate material 1 having a thickness of d. The punch 3 is connected to a ram 7, which is driven by a piston 11 in a cylinder 9 in the vertical (Z) direction.

An encoder 13 is attached below the cylinder 9, and outputs a pulse signal PLS proportional to the moving speed as the ram 7 moves up and down.

There is an oil line OL+ above the cylinder 9 and in the royal room.

A servo valve 15 is connected through 012, and the valve 15 is turned off! ! ! ! By supplying pressure oil from the oil pump 17 to the royal or lower chamber side of the cylinder 7 based on the operation, the ram 7 is driven up and down at a predetermined speed.

A pressure detector 19 is connected to the oil passage OL+ to detect the pressurizing force P during punching.

On the other hand, a servo valve control section 23 is connected to the main control section 21, and the servo 15 is controlled according to a machining pattern set by the main control section 21.

The output signal of the encoder 13 is sent to the position/velocity detection section 25.
Here, the lower end position 1iff(Z
) and its moving speed ■ are detected.

The position and velocity signals z and (2) are fed back to the servo valve control section 23, so that the servo valve 15 can be controlled in an open or closed loop state.

Furthermore, in this example, a machining pattern generation section 27 connected to the pressure detector 19 is arranged between the position/speed detection section 25 and the main control section 21, and a data storage section 29 is connected to this. .

The data storage unit 29 stores data necessary to obtain a proper machining pattern from data Z and P obtained by the test batting method work.

Next, the operation of the press machine will be explained with reference to FIGS. 2, 3, and 4.

Now, as shown in the position/time <2-1> diagram (solid line) in Fig. 2, the bunch 3 is lowered from the upper end point ZU toward the lower end point ZO at a relatively small speed V1, and then zD
Return from the point toward the upper end point zU at a relatively large speed ■2,
Trial punching shall be performed.

Then, the bunch 3 contacts the plate material 1 at the surface position E Z + of the plate material 1, and the pressure detector 19 detects the punching pressure P as shown in the pressure-time (P-t) diagram (dashed line). To detect.

Therefore, the machining pattern generation unit 27 reads the surface position z1 of the plate material 1 from the position of the bunch 3 at the time when this pressure P rises, reads the subsequent maximum punching pressure pM, and uses these data Z1. Memorize PIJ.

FIG. 3 shows the above data Z1. FIG. 3 is a position/time diagram showing a procedure for generating a machining pattern with no vibration, low noise, and high efficiency from PM.

As shown in the figure, 1. The processing pattern FAT is defined by the speed VA of the approach section, the speed VB of the punching section, the speed Vc of the scrap (product in the case of blanking) punching section, and the speed VD of the return section.

The approach section is a distance smaller than the top surface of the plate 1 (for example, 2a
1m) at the starting end position Z2 on the upper side, and the speed VA
is determined at high speed.

For plate materials with a thickness of 2Q11 or less, the punching section is set at the same distance as the thickness, and for plate materials with a thickness of 2111 or more, the punching section is set at a position Z3 below the upper surface of the plate material 1 by a predetermined distance (for example, 2 mm), and the speed VB is It is selected from the table data shown in FIG.

The table data in FIG. 4 shows speed values that can suppress vibration or noise to below the legal regulations for a predetermined punching force. This punching speed data is
It was created through experiments and is categorized by material and time period.

The punching section is defined from the punching end point to a position z4, which is defined a predetermined distance (for example, 21 m) below the bottom of the plate material 1, and the speed Vc is set to be high.

The return section is defined from the launch end Z4 to the start end Z2, and the speed Vo is set to the maximum speed.

The processing pattern FAT generated as described above is processed by the main control unit 2.
1, and this pattern FAT causes the servo valve 15 to
is controlled in an open loop.

Therefore, the bunch 3 is driven in an appropriate machining pattern as shown in FIG. 3, and highly efficient machining can be continued with low vibration or noise.

In this example, the boundary between the approach section and the punching section is made to coincide with the upper surface position of the plate material 1, but in reality, there is a slight delay in the servo valve 15 with respect to the command value, so the tip of the bunch 3 The top surface will not be hit hard and will not make a lot of noise.

In the above embodiment, only the punching speed VB is extracted from the table data to generate the machining pattern FAT, but table data of machining patterns for each thickness d is prepared in advance, and the machining pattern itself is selected from the table data. You may also do so.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented in an appropriate manner by making appropriate design changes.

[Effects of the Invention] As described above, according to the present invention, low vibration or low noise,
In addition, since a highly efficient machining pattern can be automatically generated in a trial punching operation, work efficiency is significantly improved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing a model of a cylinder press machine and its control device, and FIGS. 2, 3, and 4 are explanatory diagrams showing its operation. 3... Bunch 7... Cylinder 15... Servo valve 27... Machining pattern generation part Z... Position P... Pressure PM... Maximum value of pressing force PAT... Machining pattern VA ...Speed in the approach section V[3...in the punching section] 1 degree VC...Speed in the punching section VD...Speed in the return section Agent Patent Attorney Yasuo Miyoshi Figure 1 Figure 2 Figure 3 Figure 4

Claims (6)

[Claims] (1) In a stroke control method for a cylinder press machine whose stroke speed can be variably controlled, a workpiece is experimentally punched at a predetermined speed, and data on the cylinder pressure during punching and its vertical position are used to A stroke control method for a press machine, characterized by automatically generating a machining pattern that enables highly efficient punching of a workpiece with a desired vibration or noise value, and controlling the stroke using the generated machining pattern. (2) The processing pattern includes an approach section from the stroke start position to the workpiece, a punching section that requires pressurization, a punching section for scrap or product after punching, and a return section after punching. 2. A stroke control method for a press machine according to claim 1, wherein each section is defined by a speed value. (3) The stroke control method for a press machine according to claim 2, wherein the approach section is defined as a relatively short constant distance from the surface of the workpiece. (4) The press machine according to claim 2, wherein the punching section is set to a thickness length for a workpiece having a predetermined thickness or less, and is set to a constant length for a workpiece having a predetermined thickness or more. stroke control method. (5) The end of the ejection section is set at a position a certain distance away from the back side of the workpiece.
Stroke control method for a press machine described in Section 1. (6) The speed value in the punching section is extracted from table data of punching pressure and punching speed that can comply with vibration or noise regulations, based on the measured cylinder pressure. Stroke control method for a press machine described in Section 1.