SU1177055A1 - Apparatus for hydrostatic pressing of powder - Google Patents

Abstract

A DEVICE FOR TWISTING POWDER, including a container with a working cavity and a drain channel, a container for liquid connected by pipeline to the channel, a plunger with a cavity, radial channels and an annular groove on the lateral surface, characterized in that, in order to improve the performance of the pressing process, working conditions and reducing the cost of products, it is provided with an elastic sheath placed on the side surface of the plunger with a dome facing the container cavity nical ring vtolneno the latter, with the spherical chamfer adjacent the shell S and the lower end of the plunger (A Bsholnen hemispherical.

Description

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ABOUT

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The invention relates to powder metallurgy, in particular to devices for hydrostatic pressing of powders.

The purpose of the invention is to increase the productivity of the pressing process, improve working conditions and reduce the cost of products.

The drawing shows a diagram of the device.

The device consists of a container 1 with a working cavity 2 mounted on the table 3 of the press. The working cavity 2 is connected via a duct 4, a pipeline 5 with a valve 6, and a container 7 for a liquid. A plunger 8 is installed in the upper part of the device. A cavity 9 is made in the plunger, facing the working cavity 2, radial channels 10 and an annular groove 11. On the lateral surface of the latter there is an elastic shell 12, made of rubber, for example, with a dome 13, facing the working cavity 2 of the container, forming in the cavity 9 of the plunger a closed volume in which fluid is placed (not shown). The end face 14 of the plunger 8 is made hemispherical around the entire circumference. On the side surface of the plunger, a fixing shell 12 is mounted a ring 15c with a conical surface 16 formed towards the working cavity 2 of the container 1. On the opposite side of the ring 15, a hemispherical surface 17 is formed along the surface adjacent to the shell 12. Plunger 8 is mounted on a stand 18, the enclosing part 19 of which is made similar to the ring 15.

The device works as follows.

Before starting work, a fluid (not shown) is placed in the cavity of the plunger 8, for example water, and an elastic shell 12 with a dome 13 is put on it.

A nylon is attached to a stand 18, thereby forming a closed one. volume A plunger 15 is installed on the plunger 8 over the shell 12 at the end 14, fixing it with fasteners (not shown). At the beginning of the stroke of the plunger 8 valve 6 is open. Punger 8 enters the working cavity 2 when lifting the table 3 with the container 1. The liquid in him 552

the bones 7 and the cavity 2 displaces the air along the dome 13 and the conical surface 16 upwards, thus excluding the formation of an air bubble. Upon further immersion of the plunger 8 into the working cavity 2, the valve 6 is closed, a pressure is created in the cavity 2, which presses the dome 13 into the cavity 9, creating pressure in the volume

plunger. Fluid in this volume through the channels 10 transmits pressure to the shell 12, which, moving away from the surface of the plunger 8, fills the annular groove 11, thereby

seal the working cavity 2, creating a working pressure in it. In addition, the hemispherical end 14 and the surface 17 and the same surface of the covering part 19 of the stand 18 allow the elastic casing 12 to stretch without undercutting, while maintaining the complete tightness of the volume of the closed plunger.

After the pressing process is completed, the valve 6 opens, the pressure in the working cavity 2 is released, the dome 13 under the weight of the fluid returns to its original position, to which the shell 12j returns.

due to elastic forces. Table 3 is lowered to its original position, and plunger 8 is removed from working cavity 2. After loading cavity 2, the process is repeated.

With a significant gap between the working cavity 2 and the ring 15 to pre-create pressure in the ring 15, an additional seal can be installed.

The design of the device makes it possible to completely force air out of cavity 2 (to eliminate the air bubble) along the surface of the dome and the conical surface of the ring. Making a ring tapered with one

side allows self-centering of the entire plunger. The elimination of residual air in the cavity 2 and the self-centering of the plunger improve the efficiency of the pressing process. When using any liquids and lubricants in the closed volume of the plunger, they are prevented from being placed on the skin of the service personnel’s hands, which improves the working conditions. The absence of leakage of liquids and lubricants allows virtually for a significant

time not to fill them, thereby reducing their consumption, and; therefore, reduce the cost of the resulting products. Having a self-centering plunger makes it easier

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service the device as a whole. The absence of a spring and additional sealing elements in the piston piston simplifies the design of the device.

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Claims (1)

DEVICE FOR HYDROSTATIC POWDER PRESSING, including a container with a working cavity and a drain channel, a liquid container connected by a pipeline to the channel, a plunger with a cavity, radial channels and an annular groove on the side surface, characterized in that, in order to increase the productivity of the pressing process, improving working conditions and reducing the cost of products, it is equipped with an elastic shell located on the lateral surface of the plunger with a dome facing the cavity of the container and fixing the conic ring, the latter being fulfilled, with a spherical chamfer adjacent to the shell, and the lower end of the plunger is hemispherical. SU „1177055 1 1177055 2