Track link production method and track link produced by the same

Abstract

There are proposed a track link production method and a track link produced by this method. To this end, the track link production method includes a heat treatment process (Steps 4, 5) of applying quenching and low temperature tempering treatment to a whole link material after hot forging (Step 2), and is designed such that desired machining is applied to the link material (Step 3) before the heat treatment process (Steps 4, 5) and such that after the heat treatment process (Steps 4, 5), tempering (Step 6) and finish machining (Step 7) are sequentially applied to some of the parts which have undergone the machining process, the some parts including at least parts where high dimensional accuracy is required.

Description

technical field [0001] The present invention relates to a method for manufacturing a crawler belt link and a crawler belt link manufactured by the method, for example, a method for manufacturing a crawler belt link that constitutes a crawler track of a construction machine such as a hydraulic excavator and a bulldozer, and a method for manufacturing a crawler belt link manufactured by the method. track link. Background technique [0002] For example, the track of the walking part in the bulldozer is composed of track shoes, track links, connecting pins, track bushings, gaskets, etc., and the left and right track links are connected by bolts and nuts (refer to figure 1 ). In each of the above-mentioned track links, there are formed a supporting surface in rolling contact with the track rollers, a sliding shoe mounting surface for mounting the track shoe, a pin hole for inserting the connecting pin, a track hole for inserting the track bushing, and a hole for inserting the ga...

AI Technical Summary

Problems solved by technology

[0005] However, in surface hardening methods such as ordinary induction quenching and tempering, there is a problem that only a relatively shallow (about 15 mm) hardened layer can be obtained no matter what kind of raw material with good quenching performance is used.

Here, in order to obtain a deeper hardened layer, the heating time becomes longer when the surface heating area becomes deeper. As a result, the temperature of the support surface becomes too high, and the crystal grain size becomes coarser, and there is a problem that the toughness of this part decreases.

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