Bearing heat treatment process

Bearing heat treatment equipment directly affects the quality of bearing heat treatment, energy consumption and pollution. In recent years, with the progress of technology, the development of heat treatment technology is mainly reflected in the following aspects.

(1) Energy saving heat treatment

Adopt new heat preservation materials to improve the energy efficiency of heat treatment equipment; optimize heat treatment process, improve process output and make full use of design preparation capacity. At this stage, all bearing manufacturers are testing in this field, such as making full use of residual heat and waste heat. Some manufacturers use the residual heat of forged bearing to conduct spheroidizing annealing of parts; replace the long-term and high-energy processes with low energy consumption and short-term processes; to some extent, the lower bainite quenching process uses the shorter bainite quenching process instead of the long-term and high-energy carburizing processes.

(2) Precision heat treatment

Precision heat treatment is to ensure the stability of the optimized process, realize the small (or zero) dispersion of product quality, zero heat treatment deformation, reduce grinding allowance, improve production efficiency and save materials. In order to realize precise heat treatment, it is necessary to have good furnace temperature uniformity, temperature control accuracy and good cooling and stability of quenching agent. The precise heat treatment of bearings can be carried out in two ways: integral quenching and induction quenching.

(3) Clean heat treatment

Waste water, waste gas, waste salt, waste oil and electromagnetic radiation from heat treatment will cause environmental pollution. To solve the environmental pollution of heat treatment and to implement clean heat treatment (or green heat treatment) is one of the development directions of heat treatment technology. This applies to the atmosphere of heat treatment, quenching oil and cleaning equipment put forward high requirements.

(4) Less non oxidation heat treatment

After heat treatment, the performance of bearing is improved, the defects of heat treatment, such as oxidation, decarburization, cracking, etc., are greatly reduced, the finishing allowance after heat treatment is reduced, and the material utilization rate and processing efficiency are improved. Vacuum heating gas quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve the quality of the workpiece, reduce deformation and improve the service life.