JPH0780700A - Liquid pressure press machine - Google Patents

Abstract

PURPOSE:To enhance the working efficiency of the liquid pressure press machine and to improve the quality of products. CONSTITUTION:This liquid pressure press machine has a digital speed setter 35 and slide position setter 36 which digitally set the respective positions of a slide and the slide speeds in the respective positions and a processor CPU which stores the digital data set by the digital speed setter 35 and the slide position setter 36 and drives a proportional electromagnetic flow rate control valve 25 in accordance with the stored digital data to regulate the flow rate of the pressure oil discharged from a variable delivery pump and thereby, to control the speed of the slide.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic press machine used for sheet metal working such as drawing, punching and bending.

[0002]

2. Description of the Related Art Conventionally, in a hydraulic press machine having a slide driven by a main pressurizing cylinder, which is supplied with pressure oil from a variable displacement pump, which is driven by a stroke, in order to change the speed of the slide. Adjusts the input voltage of an amplifier for supplying a control current corresponding to the slide speed to the proportional electromagnetic flow control valve, that is, the input signal with a variable resistor. This variable resistor is a dial type, and each time the operator adjusts the variable resistor during trial manufacture and every time the slide speed is appropriately adjusted, the scale of the dial at that time is recorded and the recording data is recorded. Is used as a reference for the next press processing.

[0003]

In the conventional hydraulic press machine described above, when the slide speed is varied at a plurality of positions, the same number of variable resistors as the plurality of positions are required, and at the same time, trial production is performed. Each variable resistor is set while observing the dial scale on the basis of the above-mentioned entry data obtained by the above, and this press working is performed. However, it takes time and effort to obtain the above-mentioned bookkeeping data and productivity is poor, and it is actually extremely difficult to finely set the slide speed by adjusting the variable resistor. ,
There is a problem in that the quality of pressed products varies.

Therefore, in the present invention, by making it possible to set the slide speed at each position of the slide by a digital value capable of making the resolution higher than that of analog, the setting operation is simplified and the production efficiency is increased, and The technical problem to be solved is to reduce the variation in the quality of pressed products.

[0005]

In order to solve the above problems, the present invention is provided with a slide, which is driven by a stroke by a main pressurizing cylinder supplied with pressure oil from a variable displacement pump, on the upper portion thereof. A hydraulic press machine configured to control the speed of the slide by adjusting the flow rate of the pressure oil supplied from the variable displacement pump to the main pressurizing cylinder by driving the electromagnetic flow control valve, is used. The digital setting means for setting the slide speed at each position with a digital value, the display means for displaying each position of the slide set by the digital setting means and the slide speed at each position with a digital value, and the digital setting means Each position of the set slide and digital data of the slide speed at each position are stored, and the stored digital data is stored. A control means for controlling the slide speed by driving the proportional electromagnetic flow rate control valve based on data and adjusting the flow rate of the pressure oil supplied from the variable displacement pump to the main pressurizing cylinder. It is to have a configuration provided.

[0006]

According to the hydraulic press machine having the above construction, the control means stores the slide speed at each position of the slide set by the digital setting means in digital data, and based on the stored digital data. The proportional electromagnetic flow rate control valve is driven to adjust the flow rate of pressure oil supplied to the main pressurizing cylinder to control the slide speed.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a state before molding of a hydraulic press machine, and FIG. 2 shows a state after molding and a hydraulic circuit of the machine. As shown in FIGS. 1 and 2, the main pressurizing cylinder 2 is attached to the upper part of the press body 1,
The cylinder 3 is equipped with a rod 3 and a slide 4 on the lower end of the rod 3.
Is attached. An adapter plate 5 is attached to the lower end surface of the slide 4, and an upper die 6 is attached to the adapter plate 5.

On the other hand, a die cushion cylinder 7 is installed in the lower portion of the press body 1, and a diction pad 9 is attached to the upper end surface of the rod 8 of the die cushion cylinder 7. Die cushion pins 10A and 10B are erected on the diction pad 9, and blank holders 11A and 11B are attached to the upper ends of the die cushion pins 10A and 10B. The die cushion pins 10A and 10B are inserted into the bolster 13 supported by the frame 12, and the bolster 13
It is also inserted through the lower mold 14 placed on.

A rack 4A is attached to the slide 4, and a gear 16 meshing with the rack 4A is provided with:
Slide position sensor 1 for detecting the vertical position of the slide 4
7 is attached. On the other hand, a rack 9A is attached to the side surface of the diction pad 9, and a gear 18 meshing with the rack 9A has a gear 18 which detects the position of the diction pad 9
9 is attached. The diction pad position sensor 19 uses an analog signal output type absolute encoder.

As shown in FIG. 2, the hydraulic source of the hydraulic circuit for supplying the required pressure oil to the main pressurizing cylinder 2 is a variable discharge pump (variable displacement pump) 21 driven by a motor M.
The pressure oil delivered from the pump 21 is supplied to the main pressurizing cylinder 2 in a state where the flow rate is controlled by the proportional electromagnetic flow rate control valve 25. On the other hand, pressure oil discharged from another hydraulic pump 22 is supplied to a die cushion cylinder up / down switching valve 23 for switching the up / down direction of the die cushion cylinder 7.

FIG. 3 is a control block diagram for controlling the slide speed of the press body 1. As shown in FIG.
A processor CPU is used as the control center, and a random access memory RAM and a read only memory ROM are connected to the processor CPU. Further, an input interface 31 for inputting a signal from the outside to the processor CPU and an output interface 3 for outputting a signal from the processor CPU to the outside.
2 and 2 are connected to the processor CPU.

A press controller 33 for driving the press body 1 is connected to the input interface 31, and a pressure control start signal or the like from the press controller 33 is input. Also, the output interface
A press control device 33 is also connected to the space 32, and an operation preparation signal or the like is output to the press control device 33 from the processor CPU via the output interface 32.

Further, the slide position sensor 17 is connected to the input interface 31 via a signal converter 34. Further, a digital speed setting device 35 for setting a slide speed with a digital value and a slide position setting device 36 for setting a slide position with a digital value are connected. The digital speed setting device 35 and the slide position setting device 36 are the touch panel 4 as shown in FIGS.
It consists of zero.

On the other hand, the output interface 32 stores the slide speed and slide position data set by the digital speed setter 35 and the slide position setter 36, or the current slide speed and slide position. Monitor
A display 37 for displaying, the D / A converter (digital / analog converter) 38 and an amplifier 39 are connected to the proportional electromagnetic flow control valve 25. The digital speed setting device 35 and the slide position setting device 36,
The display 37 can be integrally configured with a touch panel 40, which will be described later and shown in FIGS. 5 to 9. Further, the amplifier 39 inputs the slide speed signal output from the processor CPU via the D / A converter 38, and supplies a drive current to the proportional electromagnetic flow control valve 25 based on the slide speed signal. .

Next, the slide speed control will be described with reference to the flowchart of FIG. As shown in step S1, when the processor CPU is powered on and the system is initialized, it is determined in step S2 whether or not the processor CPU is ready for operation, and it is determined that the operation is not ready for operation. In step S3, the defect causing the problem is excluded.

If it is determined in step S2 that the processor CPU is ready for operation, step S2
In step 4, it is judged whether or not it is the step of reading the stored data, and if it is judged that it is the step of reading the stored data, the data number is read in step S5.

In step S6, it is judged whether or not the slide speed and the slide position by the digital speed setting device 35 and the slide position setting device 36 are set. If it is judged that they are set, step S7 Enter the press operation as shown in.

In the press operation, as shown in step S8, the D / A converter 38 outputs to the amplifier 39 a voltage for driving the slide 4 at the set speed at the slide set position. In step S9, the amplifier 39 energizes the proportional electromagnetic flow control valve 25 with a drive current based on the voltage output from the D / A converter 38.
Then, as shown in step S10, in the proportional electromagnetic flow rate control valve 25, the spool moves in accordance with the drive current supplied from the amplifier 39, and the discharge amount of the variable displacement (variable discharge) pump 21 is determined. Slide 4 according to the discharge amount
Is speed controlled.

5 to 9 show image states of a touch panel (device capable of operation and display) 40 having both functions of the digital speed setting device 35 and the slide position setting device 36. In the images on the touch panel 40 shown in FIGS. 5 to 9, the switch-shaped image portions are various operation keys, and various setting operations are performed by the operator pressing the operation key portions. The other areas are display areas. FIG. 5 shows an operation screen, and FIGS. 6 to 9 show various setting screens. And the touch panel 4 shown in FIG. 6 to FIG.
The slide position and the slide speed can be digitally set in the ten-key image portion 40A of 0. Also,
It is possible to manage the pattern of the set data, and to store, read and write the data for each pattern.

[0020]

As described above, according to the present invention, the slide driven by the main pressurizing cylinder, which is supplied with the pressure oil from the variable displacement pump, is provided at the upper portion, and the slide of the proportional electromagnetic flow control valve is provided. In a hydraulic press machine configured to adjust the flow rate of pressure oil supplied from the variable displacement pump to the main pressurizing cylinder by driving, and to control the speed of the slide, a slide speed at each position of the slide. Is set by a digital value, display means for displaying each position of the slide set by the digital setting means and a slide speed at each position by a digital value, and the slide set by the digital setting means Of each position and the digital data of the slide speed at each position are stored, and based on the stored digital data, Since a proportional electromagnetic flow control valve is driven to control the speed of the slide by adjusting the flow rate of the pressure oil supplied from the variable displacement pump to the main pressurizing cylinder, each position of the slide is provided. The slide speed in can be freely set as a digital value depending on the mold, product lot, etc., and the slide speed is controlled based on the set digital data, so it is better than the conventional hydraulic press machine. It is possible to improve production efficiency and reduce variations in quality of pressed products.

[Brief description of drawings]

FIG. 1 is a front view of a hydraulic press machine according to an embodiment of the present invention.

FIG. 2 is a front view showing a molding process state of the hydraulic press machine.

FIG. 3 is a block diagram of a slide speed control of the hydraulic press machine.

FIG. 4 is a slide speed control flowchart of the hydraulic press machine.

FIG. 5 is an operation screen diagram of the touch panel.

FIG. 6 is a setting screen diagram of a touch panel.

FIG. 7 is a setting screen diagram of a touch panel.

FIG. 8 is a setting screen diagram of a touch panel.

FIG. 9 is a setting screen diagram of a touch panel.

[Explanation of symbols]

1 Pressing Machine Main Body 2 Main Pressurizing Cylinder 4 Slide 6 Upper Die 7 Die Cushion Cylinder 8 Die Cushion Pad 13 Bolster 14 Lower Die 25 Proportional Electromagnetic Flow Control Valve 35 Digital Speed Setter 36 Digital Position Setter 37 Indicator 38 D / A Converter (digital / analog converter) 39 Amplifier 40 Touch panel CPU Processor RAM Random access memory ROM Read only memory

Claims (1)

[Claims] 1. A slide driven by a main pressurizing cylinder, which is supplied with pressure oil from a variable displacement pump, is provided at the upper portion, and a proportional electromagnetic flow control valve is driven to drive the variable displacement pump from the main pump. In a hydraulic press machine configured to adjust the flow rate of pressure oil supplied to a pressure cylinder and control the speed of the slide, digital setting means for setting the slide speed at each position of the slide with a digital value. A display means for displaying each position of the slide set by the digital setting means and a slide speed at each position as a digital value; and a slide speed at each position of the slide set by the digital setting means and a slide speed at each position. In addition to storing digital data,
The proportional electromagnetic flow rate control valve is driven based on the stored digital data, and the speed of the slide is controlled by adjusting the flow rate of pressure oil supplied from the variable displacement pump to the main pressurizing cylinder. A hydraulic press machine comprising a control means.