Synthetic magnetic field type on-line steel rail welding seam normalizing treatment method and normalizing middle-frequency inductor

Abstract

The invention belongs to a synthetic magnetic field type on-line steel rail welding seam normalizing treatment method and a normalizing middle-frequency inductor, which relate to the field of middle-frequency induction heating and are used for overcoming the defects of roaring flame normalizing treatment. The method adopts two separate and identical sub-inductors to coat the external surface of an on-line steel rail welding seam, and the inner form of the two buckled sub-inductors fits into the external form of the section of a steel rail; the contact surfaces of the two sub-inductors are mutually insulated, a middle-frequency alternating current is introduced into the two sub-inductors so that a vortex is produced at the on-line steel rail welding seam for heating, and thus, the normalizing treatment process is completed. The normalizing middle-frequency inductor comprises a pair of identical and symmetrical sub-inductors of which the inner forms respectively correspond to the external form of the half section of the steel rail, and the two buckled sub-inductors are used for coating the on-line steel rail; and the contact surfaces between the two sub-inductors after coating are mutually insulated. The inductor can be conveniently buckled and coated to the steel rail welded into a line, and the on-line middle-frequency normalizing treatment of the steel rail welding seam is realized.

Description

technical field [0001] The invention relates to the field of intermediate frequency induction heating, in particular to a synthetic magnetic field type online rail weld seam normalizing treatment method and a normalizing intermediate frequency inductor. Background technique [0002] The laying process of modern railways is to first weld the 100-meter-long short rails into 500-meter long rails with a flash welding machine in the rail welding workshop, then transport the long rails to the line, and use the flash welding on the mobile rail welding car The machine welds the long rails into lines. [0003] No matter in the rail welding workshop or on the laying line, every time the flash welding machine welds, a weld will be produced. Due to the high temperature of the weld, the brittleness of the metal structure at the weld will increase and the toughness will decrease. In order to improve the plasticity and toughness of the weld and improve the comprehensive mechanical propert...

AI Technical Summary

Problems solved by technology

[0004] (1) Open fire heating, the surface heats up quickly, the internal temperature rises slowly, and the heating efficiency is low;

[0005] (2) Flame heating, large temperature difference between core and surface, uneven heating, and poor normalizing quality;

[0006] (3) Oxygen is used for combustion in the flame normalizing process, which causes the surface of the rail to be oxidized, resulting in a thicker scale, which affects the surface quality of the rail;

[0007] (4) Open flame heating is difficult to achieve automatic control and temperature detection, so it is difficult to ensure the consistency of weld normalizing quality

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