Heat processing unit case heat treating method and its device

Abstract

This invention provides a method for partially heat-treating a member to be heat-treated, which improves the quality of a heat-treated member, and to provide an apparatus therefor. The method for partially heat-treating only the particular part 1a of the member 1 to be heat-treated comprises an induction heating step 20P of induction-heating only the particular part, and a subsequent cooling step 30. The induction heating step 20P comprises charging n pieces (n is a natural number of 3 or more) of the members 1 to be heat-treated in one coil, and transporting each member to be heat-treated sequentially from the first heating position to an n-th heating position, to heat it over n times while beginning from the first heating 22(1) carried out at the first heating position and ending in the n-th heating 22(n) carried out at the n-th heating position. The partial heat treatment may be applied to partial quenching, to partial tempering, or to both of the partial quenching and the partial tempering.

Description

technical field [0001] The present invention relates to a localized heat treatment method and apparatus for heat-treated components (components used for heat treatment). [0002] The heat-treated part is, for example, a track link of a construction machine. In this case, the part that is partially heat-treated is the rolling surface of the roller. In addition, the partial heat treatment is any of partial quenching, partial tempering, or partial quenching and partial tempering. Background technique [0003] Typical heat-treated components include track shoes 2, links 1, pins 3, and bushings 4 used on the tracks of construction machinery such as hydraulic excavators and bulldozers as shown in Figure 12, and those used in construction machinery such as bulldozers and snow removal The blade tip (not shown) used in machinery, etc. For the roller rolling surface 1a of the chain link 1 (Fig. 13, Figure 14 ), particularly requiring wear resistance. [0004] In order to have thes...

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Problems solved by technology

[0018] The problem to be solved by the present invention is that the temperature difference between the surface and the core of a specific part of the induction heating method consisting of one process is large, and it is intended to further shorten the heat treatment time of the method of the above-mentioned comparative example, Problems such as improvement of productivity

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