JPH025493B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a press machine that draws a material to be drawn into an arbitrary shape, and more specifically, a method for arbitrarily changing the wrinkle pressing pressure and drawing speed during the drawing process. The present invention relates to a drawing press machine that can be used for drawing and forming.

(Prior art) Conventionally, when drawing a material to be drawn into an arbitrary shape using a press machine, a constant flow of pressure oil is supplied to the main pressure cylinder to lower the slide at a constant speed, and at the same time the slide is lowered at a constant speed. A common drawing control method has been to supply pressure oil that outputs a constant wrinkle presser pressure to keep the wrinkle presser pressure constant.

(Problems to be Solved by the Invention) In the conventional drawing control method described above, drawing is performed at a constant drawing speed and with a constant wrinkle pressing pressure, so the material to be drawn is formed into a complex shape. When drawing, there were problems such as breakage during plastic deformation or wrinkles. Therefore, in the present invention, the above problem can be solved by arbitrarily changing the wrinkle presser pressure or both the wrinkle presser pressure and the drawing speed during the forming process depending on the material, plate thickness, shape, etc. of the drawn product. The technical problem is to solve this problem.

(Means for solving the problem) The technical means for solving the above problem consists of an upper mold that moves up and down in conjunction with a slide driven by a main pressure cylinder, and a dictation driven by a dictation cylinder. A drawing press machine that squeezes the material to be drawn and forms it into a product is supported by a wrinkle holder that moves up and down in conjunction with the pad.
a slide position sensor that detects the movement position of the slide and outputs a signal according to the detected position;
A dicing pad position sensor that detects the moving position of the dicing pad and outputs a signal according to the detected position, and a wrinkle suppressing pressure corresponding to the moving position of the dicing pad during the drawing process. a pressure setting unit for setting a pressure based on the product to be molded from the material to be drawn, and a speed corresponding to a lowering position of the slide in the drawing process to the product to be molded from the material to be drawn; a pressure control valve that adjusts the pressure of the pressure oil in the duct cylinder; a flow rate adjustment valve that adjusts the flow rate of the pressure oil supplied to the main pressurizing cylinder; A pressure sensor that detects the wrinkle pressing pressure by the dictation cylinder and outputs a signal corresponding to the detected pressure, and a signal from the dictation pad position sensor are input, and the dictation pad wrinkle pressing pressure control means for controlling the pressure control valve so that the signal from the pressure sensor corresponds to the wrinkle pressing pressure each time the wrinkle pressing pressure set in the pressure setting unit is outputted; Each time a signal from the slide position sensor is input and it is recognized that the slide has reached a position where the speed is set at the speed setting section, the flow rate is adjusted so that the slide is lowered at the set speed. The invention also includes a drawing speed control means for controlling the regulating valve.

(Function) According to the drawing press having the above configuration, the wrinkle pressing pressure control means inputs a signal from the dictation pad position sensor, and the dicing pad is set at the pressure setting section. Every time you reach the position where the wrinkle pressing pressure is output,
The pressure control valve is controlled such that the signal from the pressure sensor corresponds to the wrinkle pressing pressure.

Further, the drawing speed control means inputs a signal from the slide position sensor, and each time it is recognized that the slide has reached a position where the speed is changed to the speed set in the speed setting section, the drawing speed control means changes the speed at the set speed. The flow rate regulating valve is controlled to lower the slide.

With the above control, the wrinkle pressing pressure and drawing speed can be arbitrarily changed in the drawing process according to the product to be formed from the material to be drawn. It works by making it possible to mold even products with complex shapes that are difficult to mold.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a front view showing the draw press machine of this embodiment in a pre-forming state, and Fig. 2 is a front view of the state after forming, as well as showing the hydraulic circuit of the press machine. .

As shown in FIGS. 1 and 2, a main pressure cylinder 2 is attached to the upper part of the press body 1, and a slide 4 is attached to the lower end of the rod 3 of the cylinder 2. Further, an upper mold 6 is attached to the lower end surface of the slide 4 via an adapter plate 5.

On the other hand, a dicing cylinder 7 is attached to the lower part of the press body 1, and a dicing pad 9 is attached to the upper end of the rod 8 of the cylinder 7. Diction pins 10A and 10B are attached to the upper end surface of the dictation pad 9, and blank holders 11A and 11B are attached to the upper end portions of the dictation pins 10A and 10B, respectively.

Respective dictation pins 10A and 10B
A lower die 14 is attached to the upper end surface of the bolster 13, which is inserted through the frame 12 and supported by the frame 12. The lower mold 14 has the dictation pin 10A,
10B is inserted, and the blank holders 11A and 11B are configured to be able to move up and down both ends of the lower mold 14.

As shown in FIG. 1, the material to be drawn and formed 15 is supported by the upper die 6 and blank holders 11A and 11B and waits for the start of forming. A rack 4A is attached to the side surface of the slide 4, and when the slide 4 moves up and down, the slide position detector 17 is an encoder of analog signal output type, which is equipped with a gear 16 on the rotating shaft that meshes with the rack 4A and rotates. It is established as Further, a rack 9A is attached to the side surface of the dictation pad 9, and the encoder 17 is similar to the encoder 17 having a gear 18 on its rotating shaft that meshes with the rack 9A and rotates when the dictation pad 9 moves up and down. An analog signal output type encoder is provided as the dictation pad position detector 19.

Also shown in FIG. 2 is a hydraulic circuit for supplying the required pressure oil to the main pressure cylinder 2 and the duct cylinder 7.

The hydraulic power source of this hydraulic circuit is a main pump 21 driven by a motor M, and the pressure oil output from the main pump 21 is sent to a main pressurizing cylinder for switching the vertical direction of the main pressurizing cylinder 2. Oil is supplied to the elevation switching valve 22 and the dictation cylinder elevation switching valve 23 for switching the elevation direction of the dictation cylinder 7. A proportional electromagnetic flow rate adjustment valve (flow rate adjustment valve) 24 is provided between the main pressure cylinder elevation switching valve 22 and the main pressure cylinder 2 to control the descending speed when the main pressure cylinder 2 descends. Furthermore, a proportional electromagnetic pressure control valve (pressure control valve) 25 is provided in the bypass circuit 26 for controlling the wrinkle presser pressure when the dictation cylinder 7 generates the wrinkle presser pressure.
Furthermore, a pressure gauge 27 for visually observing the pressure value of the duction cylinder 7 and a pressure sensor 28 for detecting the same pressure and outputting a signal corresponding to the detected pressure are attached.

Next, the control structure for wrinkle presser pressure control and drawing speed control will be explained with reference to FIG. In addition,
In the figure, control blocks indicated by broken lines are related to drawing speed control.

As shown in the figure, for example, a microprocessor CPU is used as the core of both of the above controls.
Random access memory RAM and read-only memory ROM are connected to the microprocessor CPU to satisfy the required storage capacity, and it also has an input/output function for inputting signals from the outside and outputting signals to the outside. An input/output interface I/O and an output interface OUT having an output function for outputting signals to the outside are connected.

A press machine control device 31 that controls the driving of the press body 1 is connected to the input/output interface I/O, and performs signal communication with the microprocessor CPU. Signals outputted from the press machine control device 31 to the microprocessor CPU include, for example, an inquiry signal asking whether the press machine can start operation, an abnormality signal, etc. There is a signal that is ready for operation, etc. as a signal that is outputted.
The input/output interface I/O also includes a signal converter 32 that converts the signal output from the dictation pad position sensor 19 into, for example, a digital signal, and a signal converter 32 that amplifies the signal output from the pressure sensor 28. After that, an amplifier 33 for converting the signal into a digital signal and a signal converter 34 for converting the signal output from the slide position sensor 17 into a digital signal are connected.

On the other hand, the output interface OUT includes an amplifier 35 that supplies a drive current to drive the proportional electromagnetic pressure control valve 25, and an amplifier 36 that supplies a drive current to drive the proportional electromagnetic flow control valve 24. Connected.

The microprocessor CPU has the input/output interface I/O, output interface
In addition to the OUT, random access memory RAM, and read-only memory ROM, there is also a pressure setting section 37 for setting the wrinkle pressing pressure corresponding to the movement position of the dictation pad 9, and a slide corresponding to the movement position of the slide 4. A pressure monitor section 39 is connected to a speed setting section 38 for setting the descending speed, and further comprises a bar-shaped LED that displays the pressure detected by the pressure sensor 28 by emitting light, for example, and a bar that displays the descending speed of the slide 4 by emitting light. A speed monitor unit 40 consisting of a type LED is connected.

The wrinkle presser pressure setting method in the pressure setting section 37 uses, for example, a keyboard provided on the operation panel of the press machine, and as shown in FIG. The wrinkle pressing pressure value obtained is stored in the random access memory RAM. Also,
The speed setting method in the speed setting section 38 uses the keyboard as in the pressure setting method, and stores a slide position and a slide lowering speed corresponding to the slide position in the random access memory RAM as shown in FIG. It is something.

Next, the wrinkle presser pressure control function will be explained according to the wrinkle presser pressure control flowchart shown in FIG. 6, and the drawing speed control function will be explained according to the drawing speed control flowchart shown in FIG. .

In FIG. 6, the microprocessor
When power is applied to the CPU, the electrical control circuit including the microprocessor CPU is initialized as shown in step 1. Next, in step 2, the microprocessor CPU determines whether the optimum creasing pressure has already been set in the pressure setting section 37 according to the material, plate thickness, shape, etc. of the drawn product, and If it is determined that the settings have been completed, it is determined in step 3 whether or not the press main body 1 is ready for operation based on signal communication with the press control device 31.

As a result of the judgment in step 3, the microprocessor
When the CPU confirms that the press body 1 side is ready for operation, the microprocessor CPU goes to step 4.
In this step, an operation signal is outputted to the press control device 31 indicating that the wrinkle presser pressure control can be started. When the main pressure cylinder 2 on the side of the press body 1 starts to descend and at the same time the duct cylinder 7 descends, the material to be drawn 15
comes into contact with the lower die 14 and starts drawing forming. In step 5, the microprocessor CPU inputs the signal from the dictation pad position sensor 19, recognizes the position of the dictation pad, and determines whether the same position is a position where the wrinkle presser pressure is to be changed. If it is determined that the same position is a position where the wrinkle presser pressure is to be changed, in step 6, the wrinkle presser pressure setting value corresponding to the same position is read from the pressure setting section 37, and the same pressure value is proportionally changed. It is converted into a drive signal corresponding to the drive amount of the electromagnetic pressure control valve 25 and output to the amplifier 35.
The amplifier 35 inputs the drive signal, supplies a drive current to the proportional electromagnetic pressure control valve 25, and supplies the required pressure oil to the dictation cylinder 7.

In the next step 7, the microprocessor
The CPU inputs the signal from the pressure sensor 28, calculates and recognizes the actual wrinkle presser pressure value, converts it into a pressure monitor signal, and sends the signal to the pressure monitor section 3.
9 to display the actual crease presser pressure on the monitor. Actually, since the wrinkle presser pressure set point set by the pressure setting section 37 covers multiple points in the descending range of the dictation pad 9, step 5 is performed.
The routine between ~Step 7 is executed for each crease presser pressure value setting point, and when the crease presser pressure control corresponding to the last crease presser pressure set point is completed, one cycle of crease presser pressure control is performed as shown in step 8. shall be completed and the operation signal shall be turned off.

Next, the drawing speed control will be explained according to the drawing speed control flowchart shown in FIG.

When the microprocessor CPU is powered on, the microprocessor
The electrical control circuit including the CPU is initialized. Next, in step 2, the microprocessor CPU determines whether the slide descending speed has already been set in the speed setting section 38, as well as setting the optimum creasing pressure according to the material, plate thickness, shape, etc. of the drawn product. If it is determined that both settings have been completed, it is determined in step 3 whether the press main body 1 is ready for operation by signal communication with the press control device 31.

As a result of the judgment in step 3, the microprocessor
When the CPU confirms that the press body 1 side is ready for operation, the microprocessor CPU goes to step 4.
At this point, an operation signal is outputted to the press control device 31 indicating that it is possible to start wrinkle presser pressure control and drawing speed control. The main pressure cylinder 2 and the dictation cylinder 7 on the side of the press body 1 begin to descend, and the material to be drawn 15 comes into contact with the lower die 14 and starts drawing.

Below, drawing speed control will be explained. In step 5, the microprocessor CPU inputs the signal from the slide position sensor 17, determines whether the position of the slide 4 is a position that changes the descending speed of the slide 4, that is, the drawing speed, and determines whether the same position is If it is determined that the slide descending speed is at a position where the slide descending speed is to be changed, the slide descending speed corresponding to the same position is read from the speed setting section 38 in step 6, and the slide descending signal is applied to the drive amount of the proportional electromagnetic flow control valve 24. It is converted into a corresponding drive signal and output to the amplifier 36. The amplifier 36 inputs the drive signal, energizes the proportional electromagnetic flow rate adjustment valve 24 with a drive current, and supplies the main pressurizing cylinder 2 with the required pressure oil.

Next, in step 7, the microprocessor
The CPU inputs the output signal of the slide position sensor 17, calculates the descending speed of the slide 4 from the time required to descend a predetermined distance, converts the calculated descending speed into a speed monitor signal, and then outputs the speed monitor section 4.
0 and display the slide descending speed on the monitor. In reality, the slide descending speed setting points set by the speed setting section 38 span multiple points in the descending range of the slide 4, so the routine between steps 5 and 7 is executed for each slide descending speed setting point. When the drawing speed control corresponding to the final slide lowering speed set point is completed, one cycle of drawing speed control is completed as shown in step 8, and the operation signal is turned off.

As described above, the wrinkle presser pressure control and the drawing speed control are performed in accordance with the wrinkle presser pressure setting value at any movement position of the dicing pad 9 set by the pressure setting section 37, respectively. In addition, drawing speed control is performed in accordance with the slide lowering set speed at any movement position of the slide 4 set by the speed setting section 38. Therefore, in the embodiment corresponding to the first invention, only the wrinkle pressing pressure is applied,
In an embodiment corresponding to the second aspect of the invention, wrinkle presser pressure control and drawing speed control are performed in combination. In the latter embodiment, the wrinkle presser pressure control is generally used as the main control, and the drawing speed control is secondary, so that even products with complex shapes that are difficult to draw and form with high quality using wrinkle presser pressure control alone can be used. This makes molding possible.

(Effects of the Invention) As described above, according to the present invention, the wrinkle pressing pressure and the drawing speed can be arbitrarily changed during the drawing process, so that the drawn product does not break during plastic deformation. Not only does it prevent wrinkles from forming, but it also has the effect of making it possible to form products with complex shapes that are difficult to draw with high quality by controlling the wrinkle pressing pressure alone.

[Brief explanation of drawings]

Figures 1 and 2 are a front view of the press main body and a hydraulic circuit diagram of an embodiment of the present invention, Figure 3 is a control block diagram of an embodiment of the present invention, and Figures 4 and 5 are wrinkle presser pressure. FIG. 6 is a flowchart for controlling the wrinkle presser pressure, and FIG. 7 is a flowchart for controlling the drawing speed. 1...Press machine main body, 2...Main pressure cylinder,
4... Slide, 6... Upper die, 7... Diction cylinder, 9... Diction pad, 1
0A, 10B...Dictionary pin, 11A,
11B... Blank holder, 13... Bolster, 14... Lower die, 15... Forming material to be drawn, 1
7... Slide position sensor, 19... Diction pad position sensor, 21... Main pump, 22
...Main pressure cylinder elevation switching valve, 23...Diction cylinder elevation switching valve, 24...
Proportional electromagnetic flow rate adjustment valve, 25... Proportional electromagnetic pressure control valve, 28... Pressure sensor, 37... Pressure setting section,
38...Speed setting section, 39...Pressure monitor section, 4
0...Speed monitor section, CPU...Microprocessor.

Claims (1)

[Scope of Claims] 1 Supported by an upper mold that moves up and down in conjunction with a slide driven by a main pressure cylinder and a wrinkle presser holder that moves up and down in conjunction with a dictation pad that is driven by a dictation cylinder. A press machine for drawing and forming that squeezes and forms a drawn material into a product, comprising: a slide position sensor that detects a moving position of the slide and outputs a signal according to the detected position; Detects the movement position of the card,
a dicing pad position sensor that outputs a signal according to the detected position; and a dicing pad position sensor that applies wrinkle suppressing pressure corresponding to the moving position of the dicing pad during the drawing process to the product formed from the drawing material. a pressure setting section for setting a descending speed corresponding to the descending position of the slide in the drawing process based on the product to be formed from the material to be drawn; a pressure control valve that controls the pressure of pressure oil from the duct cylinder; a flow rate adjustment valve that adjusts the flow rate of the pressure oil supplied to the main pressurizing cylinder; a pressure sensor that detects and outputs a signal according to the detected pressure, and a signal from the dictation pad position sensor that inputs the signal so that the dictation pad can maintain the wrinkle pressing pressure set in the pressure setting section. wrinkle pressing pressure control means for controlling the pressure control valve so that the signal from the pressure sensor corresponds to the wrinkle pressing pressure each time the slide position sensor reaches a position where the slide position sensor outputs the wrinkle pressing pressure; ,
Drawing forming speed control means for controlling the flow rate regulating valve to lower the slide at the set speed each time it is recognized that the slide has reached a position where the speed is varied to a set speed in the speed setting section; A press machine for drawing and forming, characterized by comprising: