JPS582758B2 - Funmatsu Seikei Press Niokel Daifu Dobo Shisouchi - Google Patents

Description

Detailed Description of the Invention In a powder molding press, the working order is to fill a mold with powder material, then compress it, and then discharge the molded product from the mold. However, in a conventional powder molding press, There was a problem that the die disk floated up at the point when the compression was completed.

This is because the die board is suspended at the upper limit position by an air cylinder, and is pushed down by the lowering of the punch.
When the pressurization is completed and the punch begins to rise, the die will float due to the friction between the punch and the die.

In powder molding presses, floating of the die means damage to the molded product.

The present invention reliably prevents the levitation of the die plate with a simple structure, and uses an inexpensive air-hydraulic device instead of installing an expensive hydraulic unit unlike some conventional powder presses. This is designed to reliably prevent the die board from floating up.

To explain the embodiment shown in the drawings, in Fig. 1, 1 indicates the machine frame of the press body, 2 is a slide that is raised and lowered by a crankshaft, 4 is a punch, and 5 and 5' are die plates. The die plates 5 and 5' are connected to the extension shaft 3 of the crankshaft.
A press rod 7, which is pressed down by a cam 6 fixed to the press rod 7, is used to push down the molded product after completion of compression in order to discharge it.

Reference numeral 8 denotes a bed, and 9 a stopper for the die board. Although this stopper is not shown, the stopper is adapted to remove the stop position of the die board 5' by the hydraulic pressure generated by the pressing rod 7.

A hydraulic cylinder 10 and a pneumatic cylinder 11 with a larger diameter are provided on the same axis on the bed 8, and each has a piston 12.
, 13 are fitted and connected to a common piston rod 14, and the piston rod 14 is connected to the die disk 5 by passing loosely through the die disk 5'.

The pneumatic cylinder 11 is connected to a pressurized air tank 15,
The hydraulic cylinder 10 is connected via a pipe 16, 17 to a pneumatic hydraulic tank 20 via a reverse valve 18, and to the pipe 17 a high pressure generating booster 21 having a pneumatic piston 22 is connected;
A locking valve 23 with a pneumatic piston 24 is connected to the pneumatic-hydraulic tank 20 via a pipe 17'.

25 is a support for the die plate 5' fixed to the piston rod.

The die disks 5, 5' are supported by a piston rod 14 in a raised position by air pressure from a pneumatic cylinder 11.

The punch 4 descends together with the slide 2, and while compressing the powder material M filled in the mold recess of the die plate 5, the punch 4 and the punch 4 press the die plate 5' and the piston rod 1.
The die plate 5 connected to the die plate 4 is also pushed down to the push-down stopper 9 to complete compression, but as the die plate 5, 5' is lowered, the piston rod 14 is also pushed down, so the hydraulic cylinder 10 has an empty hydraulic tank. Low oil pressure is sucked and supplied from 20.

When the compression is completed, the locking valve 23 closes the pipes 17' and 1.
6 is closed to trap the oil in the cylinder 10, the high pressure generating booster 21 is activated and high oil pressure is generated in the hydraulic cylinder 10, causing the die disk 5, due to the collapse of air bubbles in the oil and the expansion of the piping.
5' to prevent it from rising slightly.

In this state, the pusher rod 7 is lowered by the cam 6, and the die plate 5 is further pushed down than the compression completion position in order to discharge the molded product, but first, the shoulder 7' of the pusher rod 7 moves the die plate to the shoulder of the molded product. At the same time as pressing down, the stopper 9 is removed by the pressing rod 7, and the process continues until the die plates 5, 5' are pressed down further.

When the push rod 7 and the die plate 5.5' begin to descend, the check valve 1
After step 8, oil is sucked and extrusion of the molded product is completed.

As described above, the present invention connects the piston rod of the piston that fits into the pneumatic cylinder provided on the bed to the die disk, supports the die disk by air pressure, and connects the other piston fixed to the piston rod with the pneumatic cylinder. It is fitted into a hydraulic cylinder installed on a coaxial bed, and the upper chamber of the hydraulic cylinder is connected to the hydraulic pressure of an empty hydraulic tank via a check valve, and connected to a high pressure generation booster, and the other side is connected to a locking valve. It is possible to reliably prevent floating of the die board by using a simple structure connected to an empty hydraulic tank via a hydraulic tank, and it can be implemented at low cost without using an expensive hydraulic unit.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a front view of a powder molding press, and FIG. 2 is a longitudinal sectional front view of the main parts. In the figure, 1...press machine frame, 2...slide, 3...crankshaft extension shaft, 4...punch 6...cam, 7...pushing rod, 8...bed, 9...stopper,
10...Hydraulic cylinder, 11...Pneumatic cylinder, 12,1
3... Piston, 14... Piston rod, 15... Pneumatic tank, 16.17.17'... Pipe, 18... Check valve, 20... Pneumatic hydraulic tank, 21... High pressure generation booster, 22... Piston,
23...locking valve, 24...piston.

Claims (1)

[Claims] 1. In a powder molding press that lowers an itais disk as a punch attached to a slide descends, the die disk is supported by air pressure by connecting the piston rod of a piston that fits into a pneumatic cylinder installed in the bed to the die disk. At the same time, another piston fixed to the piston rod is fitted into a hydraulic cylinder provided on a bed coaxial with the pneumatic cylinder, and the upper chamber of the hydraulic cylinder is connected to the oil in the empty hydraulic tank through a check valve. A die floating prevention device is connected to the chamber and to the high pressure generating booster, and on the other hand is connected to the oil chamber of the pneumatic hydraulic tank through a locking valve.