JPS6384795A - Press die device - Google Patents

Abstract

PURPOSE:To make stable operation with high accuracy without turning of upper and lower dies by disposing plural piston rods on the concentrical circle of the piston of a cylinder device and erecting a center guide passing the central part of the pistons in a cylinder tube. CONSTITUTION:A press die device 10 is provided with a die 11 for the upper die and a punch 12 for the lower die and is so constituted as to be actuated by the cylinder device 20. The cylinder device 20 is constituted of the cylinder tube 21, the center guide 22, the piston rods 24 and the cylinder 30 provided in the center guide part. Four pieces of the piston rods 24 are disposed on the concentrical circle of the pistons 23 and the center guide 22 is passed through the central part of the pistons 23 and is erected in the cylinder tube. The pistons are exactly guided by such device and the stable operation is executed with the high accuracy even if the overall length of the pistons is shortened.

Description

[Detailed description of the invention] (Industrial application field) This invention is a press metal yJ! The present invention relates to an apparatus, and particularly to a press mold apparatus configured to operate a mold by a cylinder apparatus.

(Prior Art) A press mold device with a conventional mechanism will be explained with reference to FIG. 3. The shown press mold device 70 is for deep drawing, and is equipped with a die 71 in the upper mold and a punch 72 in the lower mold. . The cylinder device 75 in this type of mold device usually has a single piston rod 78 in the center of the piston foot.

Since the piston 77 uses a piston packing 79, it is fitted into the cylinder tube 80 with a relatively easy fit. However, in this state, there is a lack of guiding performance between the outer peripheral wall of the piston foot and the inner peripheral wall of the cylinder tube 80, so in this cylinder device 75, the overall length of the piston 77 is made longer than necessary to improve the guiding performance and stabilize the piston operation. We are trying to make this happen. In addition, since the piston rod 78 is in a state where it can freely rotate, it is necessary to separately add a rotation stopper, which will be described later.

The mold mounting board 85 on which the upper mold is attached is connected to the cylinder assembly 71.
A guide metal part 86 is attached to the piston rod 78 of 75 and slides along guide posts 82, 82, etc., which are also structural members of the press mold device 75, at the corners of this mold mounting plate 85. , 86... are provided to prevent the mold from rotating.

The die 71 is attached to the above-mentioned mold mounting board 85, and a knockout 90 is provided inside the die 71. The knockout 90 is suppressed by an elastic body, such as a spring 95, disposed between the knockout 90 and the mold mounting plate 85.
The biasing force of the spring 95 is
It changes depending on processing conditions such as the type and material of the workpiece, and processing details such as drawing depth.

(Problems to be Solved by the Invention) However, in the conventional mechanism described above, it is necessary to increase the overall length of the piston in order to compensate for the poor guideability of the cylinder device, and the overall length of the press mold installation tends to become longer.

Further, since the piston rod of the cylinder device is in a state where it can freely rotate, a rotation stopper must be separately provided on the mold mounting plate, and therefore the mold mounting plate must be enlarged.

In addition, the large size of the mold mounting plate in conventional equipment and the concentrated load on the mold mounting plate due to a single piston rod tend to cause accidents such as the mold mounting plate prying the guide post during operation. Therefore, in order to prevent this, it was necessary to increase the size of the guide metal portion that prevents rotation.

Furthermore, in conventional cylinder devices, mechanically, the knockout force is obtained by the urging force of an elastic body such as a spring, but the force depends on the type and material of the workpiece, and the processing details such as the drawing depth. Therefore, if there was a change in the above conditions, that is, the spring had to be replaced with a spring having an appropriate spring constant.

The object of the present invention is to provide a novel press die device that can solve all the drawing problems of the conventional devices as described above.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a press mold device in which one or both of the upper mold and the lower mold are operated by a cylinder device, in which the cylinder The device is characterized in that a plurality of piston rods are disposed concentrically around the piston, and a center guide that passes through the center of the piston is erected within the cylinder tube.

(Function) In other words, in this invention, since the piston of the cylinder device is accurately guided by the cylinder tube and the center guide, and a plurality of piston rods are arranged, the upper mold operated by the cylinder device Alternatively, the lower mold does not rotate and has a more uniform working load distribution.

Furthermore, another cylinder device can be provided inside the center guide as required, and this can be independently controlled and used for processing such as knockout and piercing.

(Example) A detailed explanation of the present invention will be given below with reference to the accompanying drawings.
The figure is a cross-sectional view showing the configuration of a press mold device which is an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along the line A-A in FIG. 1, and FIG. FIG.

This press mold equipment 2110 is for deep drawing, and is equipped with a die 11 in the upper mold, a punch 12 in the lower mold, and a cylinder equipment 212.
In the figure, 13 is a knockout, 14 is a cushion, 15 is a main body base, 16, 16... is a boss, and 17 is a top plate.

11 Regarding the power source of this device, see Figures 1 and 2.
To explain with the drawings, the cylinder device 20 is composed of a cylinder tube 21, a center guide 22° piston 23, piston rods 24, 24, . . . , and a cylinder device 30 provided inside the center guide 22.

As shown in FIG. 2, in the embodiment, four piston rods 24, 24, . . . are arranged concentrically and above the piston 23. Reference numerals 25, 25, . . . in FIG. 1 are guide metal portions provided on the top plate 17 for the piston rods 24, 24, .

The center guide 22 penetrates the middle right part of the piston 23 and stands upright in the cylinder tube 21. Reference numeral 26 in the figure is a sliding hole for the center guide 22 bored in the piston 23. . The sliding hole 26 and the center guide 22 are in a sliding relationship through a solid fit. In the drawing, reference numeral 27 is a piston packing, and reference numeral 28 is a guide packing.

In the figure, reference numeral 29A indicates an outflow inlet (for forward movement) of hydraulic oil that operates the piston 23, and reference numeral 29B indicates an outflow inlet (for forward movement).
(for reversing).

The cylinder device 30 is connected to the center guide 22 as shown in the figure.
The cylinder tube is made up of a piston 31 and a piston rod 32. In the figure, reference numeral 33 is a piston packing, and reference numeral 34 is a metal guide portion for the piston rod 32. In addition, the reference numeral 35A in the figure is the outflow inlet (for forward movement) of hydraulic oil that operates the piston 31.
, numeral 35B is an inlet/outlet (for retreat).

Next, the mold mounting plate 40 includes a plurality of piston rods 24.2.
4... is attached to the lower end, and the die 11 is attached to the lower surface of the lower end.
Reference numeral 41 in FIG. 0 is a guide metal portion 41 to which the upper die 2230 is fixed, and is used to introduce the piston rod 32 of the cylinder assembly 2230 as shown. The knockout 13 is connected to the piston rod 32.

(Effects) As illustrated and explained above, according to the present invention, the piston of the cylinder device in the present press mold equipment is capable of sliding between the outer circumferential wall of the piston and the inner circumferential wall of the cylinder tube, and the sliding hole of the piston. It has an excellent guide that slides through reliable surface contact with the center guide. Therefore,
Even if the total length of the piston is shortened, stable and highly accurate operation can be obtained.

Further, by arranging a plurality of piston rods at predetermined positions on the piston, the upper mold or the lower mold can be operated without rotating, and there is no need to provide a rotation stopper as in conventional devices.

What has been described above also contributes to the miniaturization of the device of the present invention.

In addition, transmitting the operating force of the cylinder device to the mold mounting plate through a plurality of piston rods makes press working with a more uniform operating load distribution possible.

Furthermore, other cylinder devices can be provided inside the center guide as necessary.

Therefore, knockouts, piercings, etc. can be hydraulically controlled independently, and even if there are changes in processing conditions such as the type of workpiece, material, and processing details such as drawing depth, the springs can be controlled independently. There is no need to go through the trouble of replacing it.

In this embodiment, the cylinder device 2230 may be the cylinder device described above, but a conventional cylinder device is used. This is because even if the conventional cylinder device has the configuration of this embodiment, it is possible to sufficiently compensate for the drawbacks of the conventional cylinder device.

In other words, as shown in FIG.
2 and the metal guide portion 34 and the metal guide portion 41, and between the knockout 13 and the die 11, the problem of poor guideability in conventional cylinder devices is solved.

Further, the problem of preventing rotation in the conventional cylinder device does not become a problem even if the knockout 13 is not a directional cylinder because it is guided by the die 11 as shown in FIG.

As described above, the present invention can solve all the problems in the conventional apparatus and improve the workability of the layer, and has a great effect on the relevant industrial field.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the configuration of a press mold device that is an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a conventional press mold device. FIG. 10...Press mold device, 11...Dice, 12.
... Punch, 20... Cylinder device, 21... Cylinder tube, 22... Center guide, 23...
Piston, 24.24... Piston rod, 30...
・Cylinder device.

Claims (1)

[Claims] 1. A press mold device in which one or both of an upper mold and a lower mold are operated by a cylinder device, wherein a plurality of piston rods are disposed concentrically around a piston in the cylinder device. At the same time, a press mold device characterized in that a center guide passing through the center of the piston is provided upright within the cylinder tube. 2. The press mold device according to claim 1, comprising a cylinder device inside the center guide.