SU1482765A1 - Plunger-type hydrostatic device - Google Patents

Abstract

The invention relates to powder metallurgy. The purpose of the invention is to reduce the labor intensity, increase productivity and improve the quality of products. The plunger 3, the entrance to the working chamber of the container 1, presses the flanging of the elastic shell 6 to the end face of the perforated holder 5 and compresses the spring 7, while the shell 6 is pressed against the end face of the plunger 3 and the container is pre-sealed. Next, the plunger, the passage through the stationary seal 9, creates pressure in the chamber, finally sealing it. Channel 4 in the plunger provides degassing of the workpiece during compaction and the possibility of irrigating the outer layer of the product without removing it from the hydrostat. The laboriousness of sealing the container is reduced, and the product is not contaminated with the working fluid. 2 Il.

Description

The invention relates to powder metaplurgy, in particular, to devices for the hydrostatic compaction of porous preforms of metal powders.

The purpose of the invention is to reduce the labor intensity, increase productivity and improve the quality of products.

Figure 1 shows the hydrostat in the initial position, a general view; figure 2 - the same, in the working position.

The hydrostat contains a container 1 with a working fluid. At the bottom of the high pressure chamber 2, there is a plunger 3, and which has a channel U for evacuating gases from the porous billet. flanging the casing 6 with the possibility of its upper end protruding above the upper end of the container 1. There are annular grooves 8 on the sealing end surface of the plunger, and a stationary seal 9 in the container.

Hydrostat works as follows.

The porous billet is loaded into the casing 5 with the plastic sheath by means of a lifting device. The press is turned on during the working stroke. The plunger 3, moving into the working chamber, presses the flared shell 6 to the end face of the perforated sleeve 5 and compresses the spring 7. The spring force presses the shell 6 to the end face of the plunger 3. The container is pre-sealed. Next, the plunger, the passage through the stationary seal 9 C container 1, acts on the working environment, creating pressure

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and the chamber, which finally seals it. As a result of this pressure, the porous preform is compacted. During the compaction process, the gases in the pores of the billet can exit through channel 4 in plunger 3. After the compaction process is completed, the billet together with the perforated holder 5 and casing 6 gradually as the plunger 3 rises is pushed by the spring 7 to its original position. The product using a lifting device is removed from the container. Then the cycle repeats.

The presence of channel A provides both the degassing of the workpiece during compaction and the possibility of an additional technological operation — irrigation of the outer layer of the product, without removing it from the hydrostatic system, with aerosols to enhance its characteristics before the subsequent technological operation.

The capacity of the hydrostat is increased by reducing the complexity of the container sealing process. Contamination of the product with a working fluid is excluded. Mechanization and automation of the compaction process is provided.

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Claims (1)

Invention Formula A plunger hydrostat containing a high-pressure container, a plunger and perforated about the boyma with an elastic casing placed in it, which is equipped with a spring, the casing and the casing are made with open upper ends and full with annular grooves at the end and a channel for the removal of gases, and the spring is installed with an intermediate end of the latter, while the upper end of the holder in the initial position is located above the upper end of the container