JPS6293036A - Press metallic die device - Google Patents

Abstract

PURPOSE:To vary partially a pressure force in accordance with a working state of a material to be worked, by constituting the titled device of one die provided with plural cylinder devices for moving a die, which has each different output pressure, and the other die to which each piston rod of the cylinder devices has been coupled. CONSTITUTION:Plural cylinder devices 20, 30 for moving a die are provided on a metallic die fitting plate 13 of a movable die 9, and the tips of each piston rod 21, 31 of them are coupled to a metallic die fitting plate of a fixed die 8. A difference of output pressures of the cylinder devices is brought by a difference of inside diameters of each cylinder, and in the cylinder device 20 of a small diameter side, and the cylinder device 30 of a large diameter side, a large pressure force is applied by the surface of a press being near the device 30 side. By a movement of the cylinder, the movable die 9 moves in the upper and lower directions, and a press working of an object B to be worked which has been inserted between a die 11 and a punch 12 is executed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a press device, and in particular a press die in which the pressurizing force on the press surface is partially changed in accordance with the processing mode of the workpiece. Regarding equipment.

(Prior art) For example, when processing metal parts for automobiles, home appliances, miscellaneous goods, etc. using a press die, depending on the shape of the workpiece, pressure may not be applied evenly to the center of the press, but may be biased to one side. Pressure may cause bunching during molding. In other words, in a mold having a left-right unbalanced mold shape P as shown in FIG. It is desirable that the pressing pressure applied to the portions C1, C2, C3, and C4 is greater in the portions C3 and C4, which have a larger pressing area, than in the portions C1 and C2, which have a smaller area.

However, it is common knowledge that conventional press devices, such as the four-column hydraulic press device 50 shown in FIG. 4, have a mechanism that generates pressure evenly at the center of the press, When an unbalanced load is required, it is unavoidable to set the mold in the press machine with the mold shifted by the amount of the unbalanced load. However, in order to shift the position and set it in this way, a press machine that is twice as large in circumference is required. In addition, as shown above, conventional equipment is originally designed as a mechanism that generates pressing force evenly at the center of the press, so if it is used with the center shifted, the unbalanced load will affect the accuracy of the machine. There have been cases where defects have occurred or the desired workpiece has not been obtained.

(Problems to be Solved by the Invention) - In view of the above-mentioned points, the present invention provides a press die device that partially changes the pressing force on the press surface in accordance with the processing mode of the workpiece. Its main purpose is to provide

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a mold including a plurality of cylinder devices for mold movement having different output pressures, and each of the cylinder devices. The present invention relates to a press mold device characterized in that it consists of another mold to which a piston rod is coupled.

(Function) That is, in this invention, instead of using a press machine like the conventional device, a plurality of cylinder devices for moving the mold are provided in the negative mold itself, and the 111
Each of the screws and rods of the above-mentioned shilling device is connected to another mold so that the mold is moved by the operation of the cylinder device, and in particular, in the present invention, the output pressure of the cylinder device is The pressurizing force on the press surface of the mold can be partially changed by making the pressure difference between the two parts different.

(Example) A detailed explanation will be given below along with an example.
The figure is a plan view of a die to show an example of press processing according to the present invention, FIG. 2 is a longitudinal cross-sectional view of a mold device showing an embodiment of the invention, and FIG. 3 is a longitudinal cross-section of another embodiment. 4 are vertical cross-sectional views of essential parts of an example of a conventional press machine.

First, the press mold apparatus of the embodiment shown in FIG. 2 will be explained. This mold is for drawing, and the die 1
1 is the upper mold (movable mold 9), punch 12 is the lower mold (fixed mold 8)
It was established in

Note that the positions of the die and punch may be reversed, and the mold may be moved laterally.

In this embodiment, the mold mounting plate 13 of the movable mold 9 has a plurality of cylinder devices 20°20.30.3 for moving the mold.
0 is set. The tips of the piston rods 21, 21, 31, 31 of these cylinder devices are connected to the mold mounting plate 14 of the fixed mold 8. When the cylinder device is actuated by fluid pressure such as oil pressure, the movable die 9 moves vertically due to the movement of the cylinder, and presses the workpiece B inserted between the die 11 and the punch 12. In the figure, reference numeral 15 is a knockout, 16 is a cylinder device for the knockout, and 17 is a wrinkle presser.

Four cylinder devices 20 and 30 are installed at each corner of the upper mold device, and by varying the output pressure of each cylinder device, the pressure applied to the press processing surface can be partially reduced. In the present invention, this is changed to .

That is, in the embodiment shown in FIG. 2, the difference in output pressure of the cylinder devices is caused by the difference in the inner diameter (bore) of each cylinder. Reference numeral 20 in the figure represents a cylinder device on the small diameter side, and 30 represents a cylinder device on the large diameter side, and it goes without saying that a greater pressing force is applied to the press surface closer to the cylinder device 30 side.

Correlating this with the mold shape P shown in FIG. 1, we can see that the large diameter cylinder device 30.30 shown by the broken line is the part C1, which has a small area, and the cylinder device 30.
A small diameter cylinder device 20.20 is arranged for C2.

The number of cylinder devices, their arrangement, and the difference in output pressure of the cylinder devices are determined as appropriate in the mold design depending on the unbalanced load required for the processing mode of the brace.

On the other hand, FIG. 3 shows an example in which the difference in output pressure of the cylinder devices is not caused by a structural difference in the cylinder devices, but is caused by a difference in the pressure of fluid flowing into the cylinders. Such pressure control of fluid pressure such as oil pressure is easily realized by using a known pressure control valve or the like. In this case, the same type of cylinder device 40 can be used, and there is an advantage that arbitrary pressure control can be obtained as appropriate using a pressure control valve or the like. The number of cylinder devices, their arrangement, and the difference in output pressure of the cylinder devices are determined as appropriate from the design point of view, as described above.

(Effects) ゛As illustrated and explained above, according to the present invention, one mold equipped with a plurality of cylinder devices for mold movement having different output pressures and another mold in which each piston rod of the cylinder device is connected. Since the press mold device is characterized by consisting of a die, it is possible to easily provide a press die device that partially changes the pressurizing force on the press surface in accordance with the processing mode of the workpiece. Became.

In addition, since the device of this invention can perform processing without using a conventional press machine, it is inexpensive in terms of equipment, and there is no need for setup work such as attaching and removing it to the press machine. It was possible to provide extremely advantageous press equipment and its mold in manufacturing and usage conditions.

[Brief explanation of drawings]

FIG. 1 is a plan view of a die showing an example of press processing according to the present invention, FIG. 2 is a vertical sectional view of a mold apparatus showing an embodiment of the invention, and FIG. FIG. 4 is a longitudinal sectional view of a main part of an example of a conventional press machine. 8...Fixed type, 9...Movable type, 11...Dice,
12... Punch, 13.14... Mold mounting plate, 17
...Wrinkle presser, 20.30.40...Cylinder device, 21.31.41...Piston rod, B...Workpiece material.

Claims (1)

[Claims] 1. The mold is characterized by comprising one mold equipped with a plurality of cylinder devices for mold movement having different output pressures, and another mold to which piston rods of the cylinder devices are connected. Press mold equipment. 2. The press mold device according to claim 1, wherein the difference in output pressure of the cylinder device is caused by a difference in cylinder inner diameter. 3. The press mold device according to claim 1, wherein the difference in output pressure of the cylinder device is caused by a difference in pressure of fluid flowing into the cylinder.