Preparation technology of three section guiding wire for making electron gun

Abstract

The invention relates to a method of preparing a three-section conductive wire for making electron guns, firstly making C, Mn and Ni in respective mass percents of 0.05-0.1%, 0.2-0.4% and 99.5-99.75% into an external lead wire; adopting resistance welding with a voltage at 2-5V and current at 0.23-0.64KA to weld an internal lead wire with an end of the dume wire in one; adopting resistance welding with a voltage at 5V and current at 0.23-0.36KA to weld the external lead wire with the other end of the dume wire in one. It adopts pure Ni as the material of external tube needles and the welding mode adopts the resistance welding, therefore by the change of the external lead wire and welding mode, it solves the weak welding problem in the course of making the conductive wire and reduces the occurrence of bad emission of kinescopes and besides, the processing technique of external lead wires is simple, largely reducing production cost.

Description

technical field [0001] The invention relates to a preparation process of a three-section guide wire for electron gun manufacture. Background technique [0002] The metal electrodes that make up the electron gun are sealed in a vacuum color picture tube to emit electron beams. After the electrode is applied with voltage, it can act as a lens to focus and converge the electron beam. The function of the three-section guide wire is to maintain electrical conduction between the internal electrode of the color picture tube and the external circuit, that is, to introduce the applied voltage into the sealed electrode. The three-section guide wire used in the manufacture of electron guns is composed of three parts: the outer tube needle, the magnesium wire, and the inner lead wire. These three parts are connected together by welding. At present, the outer tube needle of the three-section guide wire is a composite material with nickel-plated carbon steel surface. The production pro...

AI Technical Summary

Problems solved by technology

The key point of nickel plating is the control of nickel sulfate concentration and nickel plating time, but the nickel plating layer is very thin, and the thickness must be controlled within the range required by the process, which is technically difficult and prone to uneven plating and thickness exceeding specifications

If the nickel plating layer is unqualified, it is easy to produce weak welding during welding, so that the tube pins fall off in the picture tube and the electron gun stem is not conductive, and the cost of testing the thickness of the nickel plating layer is also high.

Therefore, the process of surface nickel plating on composite materials is complex, technically difficult, and high in production costs.

At present, the welding of the guide wire adopts the arc welding method, and the arc welding has the following disadvantages: more spatter, high welding voltage, unable to realize computer control, and high cost

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