Heat Treatment Furnace in Bearing Industry
Bearing heat treatment is directly related to the quality of subsequent processing, which ultimately affects the service performance and life of parts. At the same time, bearing heat treatment is a major energy consumption and pollution in bearing manufacturing. Bearing heat treatment equipment directly affects the quality of bearing heat treatment, 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) Clean heat treatment. Wastewater, waste gas, waste salt, waste oil and electromagnetic radiation produced by heat treatment will pollute the environment. To solve the environmental pollution problem of heat treatment, implementing clean heat treatment (or green environmental protection heat treatment) is one of the development directions of heat treatment technology. This puts forward high requirements for the atmosphere of heat treatment, quenching oil and cleaning equipment.
(2) Precision heat treatment. Precision heat treatment is to fully ensure the stability of the optimization process, to achieve product quality dispersion is very small (or zero), heat treatment distortion is zero, reduce grinding allowance, improve production efficiency and save materials. Achieving precise heat treatment must have good uniformity of furnace temperature, accuracy of temperature control, and good cooling and stability of quenching agent. Achieving precise heat treatment of bearings can take two ways: whole quenching and induction quenching.
(3) Selecting new heat preservation materials for energy-saving heat treatment to improve energy utilization of heat treatment equipment, optimizing heat treatment process, increasing process output, and giving full play to the capacity of equipment. At present, bearing manufacturers are doing experiments in this field, such as making full use of waste heat and waste heat, some manufacturers have used forging waste heat to annealing ball bearing parts, adopting low energy consumption, short cycle instead of long cycle and high energy consumption process, etc. Lower bainite quenching process has replaced cycle with shorter bainite quenching process to a certain extent and within a certain range. Long and energy-consuming carburizing process.
(4) Few non-oxidative heat treatments change from protective atmosphere heating instead of oxidizing atmosphere heating to controllable atmosphere heating with precise control of carbon potential and nitrogen potential. After heat treatment, the performances of parts are improved, the defects of heat treatment such as oxidation, decarbonization and cracks are greatly reduced, the remaining amount of finishing after heat treatment is reduced, and the utilization rate and machining efficiency of materials are improved. Vacuum gas quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve the quality of the workpiece, reduce distortion and improve life.