Forging method of bearing ring

Abstract

The invention relates to a forging method of a bearing ring. The forging method is characterized by comprising the following steps of heating, raising the temperature, preserving the temperature, forging, quickly cooling and naturally cooling, wherein in the heating step, a bearing ring blank is heated from common temperature to the temperature of 900 DEG C; in the temperature raising step, the temperature of the bearing ring blank is raised from 900 DEG C to 1150 DEG C; in the temperature preserving step, the temperature of the bearing sleeve blank is preserved for 0.5 to 1 hour at 1150 DEG C; and in forging step, the bearing ring forged is at 930 to 980 DEG C; and in the quickly cooling step, the forged bearing ring is dipped into a cooling medium for being quickly cooled to reach 700 DEG C. According to the forging method, the cooling medium is water; the quick cooling is carried out for 7 to 18 seconds; the heating is carried out for 4 to 7 seconds; and the temperature raising time is 2 to 3 seconds; and the forging is carried out for 4 to 7 seconds. With the adoption of the forging method, spherical, small and uniformly distributed quenching structures of carbide can be obtained, and the dimension of carbide particle is not greater than 5 um to the maximum, thus reaching the value below the critical value of cracking initiated by amorphous impurity; and the contact fatigue life of a bearing is prolonged.

Description

technical field [0001] The invention relates to a method for forging a bearing ring, which is mainly used for the forging process of a high-carbon chromium bearing ring. Background technique [0002] The main parts of the bearing are composed of inner and outer rings, rolling elements and cages. The quality of the inner and outer rings determines the service life to a large extent. At present, most of the inner and outer rings of bearings used in China are made of high-carbon chromium bearing steel materials by forging, etc., and their service life is very different from that of similar foreign products. According to the production experience and research results of domestic and foreign counterparts, the main factors affecting the quality of bearing steel are inclusions, carbides and spheroidized structures, etc. These factors will ultimately affect the fatigue life of bearings. The content and characteristics of inclusions in bearing steel mainly depend on the smelting pro...

AI Technical Summary

Problems solved by technology

Although the bearing manufacturing industry has put forward requirements for the carbide and spheroidized structure of the main components of the bearing, the current requirements are not strict. The bearings produced according to the current general ferrule forging process can meet the technical conditions for heat treatment of high-carbon chromium bearing steel rolling bearing parts ( JB / T 1255-2001), but the carbide particles (no quantification requirements) are relatively coarse, and the distribution (no quantification requirements) is uneven, which seriously hinders the improvement of bearing service life

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