A method of controlling rolling and cooling for fine and homogeneous structure of bearing ring

Abstract

The invention relates to the bearing manufacturing technology. A bearing ring organization refining-homogenizing rolling-cooling control method is characterized by comprising the following steps that (1) a blank is prepared in a hot-forging mode; (2) hot rolling is controlled, namely the hot-forged bearing ring blank is subjected to hot rolling on a ring rolling machine to form a bearing ring, rolling deformation, deformation speed and deformation temperature are reasonably controlled, the hot-rolled bearing ring is obtained; (3) forced cooling is carried out, namely forced cooling is carried out on the hot-rolled bearing ring by water cooling and air cooling; the hot-rolled bearing ring is immersed into cooling water of 60-80 DEG C to be cooled to 400-500 DEG C, and the hot-rolled bearing ring is cooled to room temperature by a fan in an air-blowing mode after being taken out. According to the method, the grain sizes and carbide particles of the obtained bearing ring are refined, the grain sizes are even, a bearing ring organization can be effectively refined and homogenized.

Description

technical field [0001] The invention relates to a bearing manufacturing technology, in particular to a bearing ring structure refinement, homogenization, controlled rolling and controlled cooling method. Background technique [0002] The bearing ring is the base and core component of the bearing, and its organizational properties have an important impact on the quality and service life of the bearing. Hot rolling forming is an advanced plastic processing method for bearing rings. It rapidly and precisely forms bearing rings of specified sizes by causing continuous local plastic deformation of hot bearing ring blanks. It is suitable for forming bearing rings of various materials and sizes. It is the most widely used processing method for bearing ring production. At present, in the hot rolling production of bearing rings, the process conditions of hot rolling and post-rolling cooling fluctuate greatly, and there is a lack of stable control. For the hot rolling process, the h...

AI Technical Summary

Problems solved by technology

For the hot rolling process, the hot rolling temperature of the same type of bearing ring fluctuates greatly, resulting in large fluctuations in the deformation and structure uniformity of the bearing ring. Thinning, high hot rolling temperature, bearing ring grains are easy to grow and coarsen during hot rolling and cooling after rolling

For the post-rolling cooling process, stacked air cooling is generally used, the cooling speed is slow and the efficiency is low, and the cooling speed of the bearing rings in different regions is inconsistent, which not only promotes the grain growth of the bearing rings during the cooling process, but also leads to poor consistency of the microstructure of the same batch of bearing rings after cooling

Due to the lack of stable control of the hot rolling and post-rolling cooling process conditions of the bearing ring, the grains of the bearing ring after hot rolling and cooling are coarse and uneven, and the dispersion of the microstructure is large, which will cause serious genetic hazards to the subsequent heat treatment and eventually affect the microstructure of the bearing ring. Performance and Bearing Life

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