SU1380862A1 - Apparatus for pressing sintering of articles from powder - Google Patents

Abstract

This invention relates to pressure sintering devices for powder articles. The aim of the invention is to increase productivity. The device consists of a high-pressure chamber I, an elastic sheath 4 and a plunger 3. A current lead 7 is connected to the plunger, and a current lead 8 is placed inside the plunger. Tokopod- water insulated powder loose material. The elastic shell 4 is attached to the plunger 3. The product with a thickness of less than 2 mm is fixed inside the shell, attached to the plunger and lowered into the high pressure chamber. When hydraulic pressing through the product passes el.tok. By breaking loose insulators, the product is easily and quickly removed from the mold. Improved pressing performance by reducing the time for decompression. 2 Il. {(/)

Description

The invention relates to powder metallurgy, in particular, devices for sintering articles of the type of rods with a diameter of less than 2 mm from metal powder under pressure.

The purpose of the invention is to increase the production capacity.

In Fig.1 schematically shows the proposed device, a General view; Fig. 2 shows an elastic shell with a extruded product.

A device for sintering pressurized articles from powder contains a chamber 1 filled with a working medium 15

ten

2, such as oil mounted on a hydraulic press table

DB 2432 (not shown), with plunger

3, on the end of which the elastic shell 4 is fastened with the help of a NU1DNY nut 5 and a gland ring 6 (FIG. 2). A power supply 7 is connected to the plunger 3. The plunger 3 is provided with a cavity inside which a second current lead 8 with a heat insulator 9 is placed. In the elastic sheath 4 there is a heat insulator 10 (FIG. 2) made of compressed alumina serving as heat) screen and protecting the shell 4 from overheating. Inside the heat-insulator torus 10 there is a conductor and a glass cup 11 made of a flexible shielding braid of the cable with heat insulator 12 in it, made of aluminum LUMINUM and

put on the sintered product. The glass I1 provides contact with the end face of the plunger 3 by means of a flange created by flanging. The transition from the sheath to the extruded product to ensure conductivity is carried out by the insert 13 of compressed graphite powder. In the upper part of the conductive cup 11 there is a copper insert 14 with an insulator 15, which connects the internal tokopod BOD 8 with the sintered part 16, a plunger cuff.

The device works as follows.

Preliminary, from the starting material, the blank of the required profile and press it with a thermal insulator with a 12 B hydrostat. The pressed billet is placed in a flexible conduit of an egg cup 1 1 having a molded graphite insert 13 at the bottom, and is closed with insulator 15 with a copper insert 14 inside it. Glass 1I is pressed in a hydrostat

20

heat insulator 10 and placed in a plastic sheath 4. The system prepared in this way is attached with a nut 5 and a sealing ring 6 to the plunger 3, which is in the upper position. This achieves sealing of the shell 4 and the electrical contact from the internal power supply 8, insert 14, the sintered workpiece, the insert 13, the flexible current-carrying cup 11 and the body of the plunger 3. The shell 4 together with the plunger 3 is introduced oil to a certain level and create a high pressure using a press with the help of the cuff 16. The oil pressure fully affects the flexible cup 11 and with the help of the compacted heat insulator 12 acts on the sintered billet. cut off the current from the power source through an automatic system (not shown). A preheating of the preform is created. 101. The magnitude and time of current flow depend on the required sintering temperature for the material. After the current is turned off and the preform is cooled to 600 ° C, the adunger 3 is lifted with a press. The sintered workpiece is removed. The cycle of operation is repeated.

Thus, the proposed installation of pressurized products for sintering powder products makes it possible to increase the productivity of the process by quickly removing the blanks from the chamber due to the placement of current leads on the punch and making insulators of powdery material.

25

thirty

40

45

50

55

Claims (1)

Invention Formula A device for sintering powder articles containing a high pressure chamber, an elastic shell, a plunger, current leads and heat insulators, characterized in that, in order to increase productivity, it is equipped with an additional heat insulator; with a cavity, one power supply is connected to the plunger, and the other current lead and additional heat insulator are placed in the cavity of the pluker, and the heat insulator is made of pressed material Invention Formula A device for sintering powder articles containing a high pressure chamber, an elastic shell, a plunger, current leads and heat insulators, characterized in that, in order to increase productivity, it is provided with an additional heat insulator, the elastic shell is fixed on the plunger, the latter is made with a cavity, one power supply is connected to the plunger, and the other current lead and additional heat insulator are placed in the cavity of the pluker, and the heat insulator is made of pressed material w FIG. g