Forging process of bearing ring

Abstract

The invention relates to a forging process of a bearing ring. The process includes following steps that: 1) in first firing, a medium-frequency induction heating furnace is adopted to heat an ingot to 1200 DEG C, dead head pressing, chamfering and sprue filing are performed; 2) in second firing, re-heating, upsetting and drawing out are performed on the machined ingot; 3) in third firing, re-heating, upsetting, rotary flattening, punching and reaming are performed on the machined ingot; 4) in fourth firing, the machined ingot is re-heated, and upsetting is performed on the machined ingot in a mold ring, so that the machined ingot can be in a technique size, the mold is removed, and reaming is performed on the machined ingot, so that the machined ingot can be in a technique size, and total forging ratio is controlled to be larger than 5; 5) groove turning is performed, the machined ingot is subjected to cold rolling and reeling on a closed shaping and reaming machine, and rolling paths and chamfered angles are molded with one step, truing is performed, and two end surfaces are subjected to soft grinding; 6) the machined ingot is pre-heated to 800 DEG C to 850 DEG C, after crack detection is performed, when the temperature of the machined ingot is lower than 450 DEG C, the machined ingot is put into the furnace so as to pre-heated to 600 DEG C to 650 DEG C, and heat preservation is performed on the machined ingot, and the machined ingot is put in to the furnace of which the temperature ranges from 950 DEC C to 1000 DEC and is rapidly heated to 1140 DEC C to 1200 DEC C, and water quenching is performed, and instantly, tempering from 550 DEC C to 600 DEC C is performed on the machined ingot, and the machined ingot is cooled to 400 DEC C to 450 DEC C in the furnace, and the machined ingot is taken out from the furnace and cooled. With the forging process adopted, inherent defects of metal can be eliminated, and the service life of a bearing can be prolonged.

Description

technical field [0001] The invention belongs to the technical field of forging, and in particular relates to a forging process of a bearing ring. Background technique [0002] The bearing ring is an important annular part of a rolling bearing with one or several raceways, and its weight generally accounts for about 60~70% of the total weight of the bearing. The ring blanks include forgings, cold extrusions, warm extrusions, pipe and rod Among them, forgings account for about 85% of the total number of ferrule blanks. The internal quality of the ring includes material density, metal fiber streamline distribution, grain size and deformation heat treatment, etc., which have a greater impact on the bearing life, so the quality of the ring blank and the level of productivity will affect the bearing. Product quality, performance, life and the economic benefits of enterprises have an important impact. Bearing rings are thin-walled ring forgings, which are prone to problems such a...

AI Technical Summary

Problems solved by technology

Bearing rings are thin-walled ring forgings. During the forging process, problems such as uneven wall thickness, folding, and ellipse are prone to occur, resulting in insufficient bearing accuracy and affecting the service life of the bearing.