A kind of non-quenched and tempered steel support roller and its preparation method

Abstract

The invention discloses a non-quenched non-tempered steel track roller and a preparation method thereof. The track roller is prepared from forgeable non-quenched non-tempered steel with excellence performance through forging heating, forging, controlled cooling and surface induction quenching. Compared with conventional processes for preparing track rollers through hardening and tempering and surface induction quenching, the method provided by the invention has the advantages that the procedure of hardening and tempering is omitted; energy consumption and waste liquid discharge are reduced; energy conservation and environmental protection are realized; and production cost is lowered and production period is shortened.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a non-quenched and tempered steel supporting wheel and a preparation method thereof. Background technique [0002] Track rollers are an important part of the crawler-type construction machinery walking mechanism. Its main function is to support the self-weight and load of the equipment, so that the track can walk along the wheels. For crawler-type equipment with a large tonnage, such as large-tonnage excavators and cranes, the rollers must have good comprehensive mechanical properties and surface wear resistance. [0003] At present, most of the supporting wheels are made of 50Mn, 40Mn2, 42CrMo and other materials. They are formed by casting or forging. The hardness reaches 45HRC~55HRC, so as to increase the surface wear resistance of the rollers. The track rollers prepared by this process have good comprehensive mechanical properties and surface wear resistance, ...

AI Technical Summary

Problems solved by technology

However, the following problems still exist in the practical application of this process method: (1) When the size of the supporting wheel is large, the temperature of each part is uneven due to the inconsistent cooling rate of each part, resulting in unhardened local areas, and different parts The problem of uneven quenching deformation; (2) The existence of oxide scales on the surface of forgings reduces the quality of surface hardening, and prone to quenching soft spots that affect the wear resistance of parts; (3) The heat treatment process of the rollers is integral quenching+ Low temperature tempering, the hardness of the working surface is generally 45HRC~55HRC, it is difficult to obtain a higher hardness of the working surface

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