Bearing heat treatment method
The development of heat treatment
(1) cleaning and heat treatment
The waste water, waste gas, waste salt, dust, noise and electromagnetic radiation produced by heat treatment will pollute the environment. It is one of the developing directions of heat treatment technology in developed countries to solve the environmental pollution problem of heat treatment and implement clean heat treatment (or green heat treatment). In order to reduce the emission of SO2, CO, CO2, dust and cinder, the use of coal as fuel has been basically eliminated, and the use of heavy oil has been decreasing. The majority of heavy oil has been converted to light oil, and natural gas is still the most ideal fuel.
The waste heat utilization of the combustion furnace has reached a high degree, and the optimization of burner structure and strict control of air-fuel ratio ensure reasonable combustion, so as to reduce NOX and CO to the minimum. The use of gas carburizing, carbon and nitrogen co-carburizing and vacuum heat treatment technology instead of salt bath treatment to reduce the pollution of waste salt and cn-containing toxic substances to water sources; Water soluble synthetic quenching oil was used instead of some quenching oil, and biodegradable vegetable oil was used instead of some mineral oil to reduce oil pollution.
(2) precision heat treatment
Precision heat treatment has two meanings: on the one hand, according to the use requirements of parts, materials and structural dimensions, the use of physical metallurgy knowledge and advanced computer simulation and detection technology, optimization of process parameters to achieve the required performance or maximum potential of materials; On the other hand, the stability of the optimized process is fully guaranteed, and the product quality dispersion is small (or zero) and the heat treatment distortion is zero.
(3) energy-saving heat treatment
Scientific production and energy management are the most potential factors for energy efficient utilization. It is the choice of scientific management to establish a professional heat treatment plant to ensure full capacity production and give full play to equipment capacity. In heat treatment energy structure, primary energy is preferred. Make full use of waste heat and waste heat; The technology with low energy consumption and short cycle is adopted to replace the technology with long cycle and high energy consumption.
(4) less non-oxidation heat treatment
From the use of protective atmosphere heating instead of oxidizing atmosphere heating to the controlled atmosphere heating with accurate control of carbon potential and nitrogen potential, the performance of the parts after heat treatment was improved, the heat treatment defects such as decarbonization and crack were greatly reduced, the amount of precision machining after heat treatment was reduced, and the utilization rate of materials and machining efficiency were improved. Vacuum heating quenching, vacuum or low pressure carburizing, nitriding, nitrogen carburizing and boronizing can improve quality, reduce distortion and improve life.