Vacuum local heat treatment device and method for shaft workpieces

Abstract

A vacuum local heat treatment device for shaft workpieces comprises a temperature display device and an electric induction high-frequency heating machine arranged on a workbench. A containing cavity is formed in the protection cover shell and used for containing the shaft workpiece needing to be heated; the vacuum generator assembly is connected with the protective cover shell and used for vacuumizing the containing cavity of the protective cover shell; the temperature sensor is used for sensing the temperature of the accommodating cavity and is connected with the temperature display device; the quenching tank is arranged at the position close to the workbench; an annular groove is formed in the lower portion of the protective cover shell, and a cooling medium is contained in the annular groove. And an induction coil of the electric induction high-frequency heating machine is sleeved on the upper part of the protective housing. The heat treatment device provided by the invention can be used for creating a vacuum environment during local heating of shafts and displaying the temperature of a heating section, so that a non-heating section is protected during local heating of the shaft workpieces, and the heating section does not generate oxide skin by utilizing the vacuum environment.

Description

technical field [0001] The invention relates to the technical field of heat treatment of shaft workpieces, in particular to a vacuum partial heat treatment device and method for shaft workpieces. Background technique [0002] The shaft metal workpiece used on the connector has different mechanical properties in different parts of the workpiece, and after heat treatment, the surface is not allowed to be oxidized. Therefore, it is necessary to perform local heat treatment on the parts to change the organizational structure of different sections of the workpiece to meet the requirements of its use. At this stage, the electric induction high-frequency machine is commonly used in the industry to locally heat the metal workpiece. The principle is to use the principle of electromagnetic induction to generate a high-density induced current on the surface of the metal workpiece to rapidly heat it. [0003] For example, the patent with the application number CN201820716733.9 disclose...

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Problems solved by technology

[0005] In the above-mentioned existing patented technology, the workpiece is heated in the air, and a thick oxide scale will be formed on the surface of the part, and the structure and performance of the non-heating section of the workpiece will be affected by the heat conduction of the heating section.

Therefore, the local induction heating heat treatment process of a simple electromagnetic induction machine is not effective, and the formed oxide skin will cause the product quality to be unqualified, or directly cause the workpiece to be scrapped

In addition, in the prior art, the heated workpiece can only be felt manually through the color of the heated workpiece, and the temperature of the workpiece cannot be quantified, resulting in the inability to guarantee the heating temperature of the workpiece

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