bearing heat treatment is directly related to the subsequent processing quality, which ultimately affects the service performance and life of parts. at the same time, bearing heat treatment is a large energy consumption and pollution household in bearing manufacturing. The heat treatment equipment of bearings directly affects the quality of bearing heat treatment, as well as energy consumption and pollution. In recent years, with the progress of science and technology, the development trend of heat treatment technology is mainly reflected in the following aspects:

(1) waste water, waste gas, waste salt, waste oil and electromagnetic radiation produced by clean heat treatment will pollute the environment. To solve the environmental pollution problem of heat treatment, clean heat treatment (or green environmental heat treatment) is one of the development directions of heat treatment technology. This puts forward high requirements for heat treatment atmosphere, quenching oil and cleaning equipment.

 (2) Precision heat treatment is to fully ensure the stability of the optimized process, to realize the product quality dispersion is very small (or zero), the heat treatment distortion is zero, the grinding retention is reduced, the production efficiency is improved, and the material is saved. In order to realize precision heat treatment, it is necessary to have good furnace temperature uniformity, temperature control accuracy, and good coolability and stability of quenchant. The precision heat treatment of bearings can take two paths: integral quenching and induction quenching.

(3) Energy saving heat treatment selects new heat preservation materials to improve the energy utilization rate of heat treatment equipment, optimizes heat treatment process, improves process output and gives full play to the ability of equipment. At present, all bearing manufacturers are doing this test, such as making full use of waste heat, waste heat, some manufacturers have used forging waste heat to carry out spherical annealing of bearing parts; using low energy consumption, short period process instead of long cycle, high energy consumption process, etc.; Lower bainite quenching process to a certain extent, with a shorter bainite quenching process to replace the carburized process with long cycle and high energy consumption.

(4) less non-oxidizing heat treatment changes from protective atmosphere heating instead of oxidation atmosphere heating to accurate control of carbon potential. After heat treatment, the properties of parts are improved, heat treatment defects such as oxidation, decarbonization and cracks are greatly reduced, and the finishing retention after heat treatment is reduced, which improves the utilization ratio and machining efficiency of materials. Vacuum heating gas quenching, vacuum or low pressure carburization, nitriding, nitrocarburizing and boronizing can obviously improve the quality of workpiece, reduce distortion and improve life.