SU1493436A1 - Method of manufacturing bimetal electrodes - Google Patents

Abstract

The invention relates to mechanical engineering, and more specifically to metalworking methods, and can be used in the manufacture of bimetallic electrodes for plasma cutting and welding. The purpose of the invention is to simplify the manufacture of bimetallic electrodes and increase the service life of the electrodes by increasing their quality. An axial force is applied to the projecting ends of the insert 1, which exceeds the wall thickness of the holder 2, with the current-carrying elements 3 under a pressure of 2.0 KN. For 0.5-1.0 s, electric current is passed, the insert 1 is heated until its oxide film is destroyed and the metal holder 2 is melted in the boundary layer at a temperature of 1300-1500 ° C and the insert 1 is pressed into the metal holder 2. As a result good contact between the insert and the holder, and at the same time eliminating the formation of "parasitic" electrical resistance points, which additionally heat the insert during operation, improve the quality of bimetallic electrodes and increase their service life. 1 il.

Description

The invention relates to mechanical engineering, and more specifically to metal working methods, and can be used in the manufacture of bimetallic electrodes for plasma cutting and welding.

The chain of the invention is to simplify the manufacture of bimetallic electrodes and increase the service life of the electrodes by increasing their quality. .

- The drawing shows a flow chart of the method for manufacturing bimetallic electrodes.

The method is carried out as follows.

The insert 1, made of zirconium with a diameter of mm, is slidly inserted into the hole made in the slow holder 2, so that the end ends of the insert 1 protrude 1.0-1.5 mm from the hole of the copper holder 2 by erd thickness.

Then the insert I is placed between the electrodes of the 3 contact machine and a full welding cycle is performed. With the passage of electric current through the insert 1, the latter is instantly heated by joule heat to 1300-1500 ° C and the zirconium oxide film is destroyed

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and the melting of honey in the boundary layer simultaneously applied axial force under pressure of 2.0 kI for 0.5-1.0 s plastically deforms insert 1; copper melted in the boundary layer fills the space between insert 1 and holder 2 and microscopic unevenness Inserts I, which were formed by mechanical processing and plastic deformation, heating, and thus deforming the zirconium insert 1, would produce it; .pressing into a copper holder 2, iExample, Implementation of the method with optimal parameters,

In the copper holder 2, prepared by pressing on a lathe, with a hole in the axis with a diameter of 2 mm, a zirconium insert 1 with a diameter of 2 mm (with a minus tolerance) is inserted by sliding from. Copper holder 2 in both directions: 1, 5 mm (total insert length 7 mm), Copper holder 2 with zirconium

the insert I is placed between the electrodes of the point contact machine so that. that the electrodes of the machine are supported only by the insert 1. Applying pressure to the electrodes of the contact machine is applied to the insert with a force of 1-2, 0 - kN then an electric current of 9000 A is passed for 0.8 s. By the action of current, the insert 1 heats up up to 1300 ° C, melts the boundary layer of the holder 2 and, due to the applied compressive force in plastic state, is also pressed into copper

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rover 2, providing a good con.

The application of the proposed method for the manufacture of bimetallic electrodes makes it possible to obtain reliable contact between the insert and the holder, which improves the quality of the bimetallic electrodes and increases the service life.

Claims (1)

Invention Formula A method of manufacturing bimetallic electrodes, consisting in pressing a refractory thermochemical insert into a metal holder of a more durable material by heating and applying an axial compressive force with conductive elements, characterized in that, in order to simplify the manufacture of bimetallic electrodes and increase the service life of the electrodes by increasing their quality, the insert to be pressed in, the length of which exceeds the wall thickness of the holder, is installed in the opening of the wall of the holder, to the protrusions The inserts with current-carrying elements are applied to the inserts with an axial force of 2.0 kN, electric current passes for 0.5-1.0 s, the insert is heated to a temperature of 1300-1500 C, deforming and destroying its oxide film and melted the metal holder in the boundary layer , and at the same time pressing it into the metal holder. Editor L. Veselovska Compiled by L.Nazarova Tehred M.Didyk Order 3933/16 Circulation 894 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and Publishing Combine Patent, Uzhgorod, st. Gagarin, 101 Proofreader O. Tsiple Subscription