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Foreign bearing heat treatment
The quality of heat treatment is directly related to the quality of the subsequent processing, which ultimately affects the performance and life of the parts. At the same time, heat treatment is the major energy consumption and pollution of the machinery industry. In recent years, with the advancement of science and technology and its application in heat treatment, the development of heat treatment technology is mainly reflected in the following aspects: (1) Wastewater, waste gas, waste salt, dust, noise, and electromagnetics formed by the production of clean heat treatment heat treatment. Radiation, etc. will cause environmental pollution. To solve the problem of heat treatment of environmental pollution, the implementation of clean heat treatment (or green heat treatment) is one of the directions for the development of heat treatment technology in developed countries. In order to reduce the emission of SO2, CO, CO2, dust and coal slag, coal has been basically eliminated as a fuel, and the use of heavy oil has become less and less. Most of the light oil has been used instead, and natural gas is still the most ideal fuel. The utilization of waste heat in the combustion furnace has reached a very high level. The optimization of the burner structure and the strict control of the air-fuel ratio ensure that under the premise of reasonable combustion, NOX and CO are reduced to the minimum; use of gas carburizing, carbonitriding Vacuum heat treatment technology replaces salt bath treatment to reduce the pollution of waste water and CN-contaminants to water sources; water-soluble synthetic quench oil is used instead of some quench oil, and biodegradable vegetable oil is used instead of some mineral oil to reduce oil pollution. (2) Precise heat treatment Precision heat treatment has two meanings: On the one hand, it is based on the use requirements of parts, materials, structural dimensions, physical metallurgical knowledge and advanced computer simulation and detection techniques, to optimize process parameters, to achieve the desired performance or Maximize the potential of the material; on the other hand, it fully guarantees the stability of the optimized process and achieves a small (or zero) dispersion of product quality and zero heat treatment distortion. (3) Energy-saving Heat Treatment Scientific production and energy management are the most potential factors for the effective use of energy. Establishing a professional heat treatment plant to ensure full-load production and give full play to equipment capabilities is a scientific management option. In terms of heat treatment energy structure, priority should be given to primary energy; full use of waste heat and waste heat; use of low-energy-consuming, short-cycle processes to replace long-cycle, energy-intensive processes. (4) Less Oxidation-free Heat Treatment Heat from the protective atmosphere instead of the oxidizing atmosphere is heated to a controlled atmosphere with precise control of carbon potential and nitrogen potential. After heat treatment, the performance of the parts is improved, and heat treatment defects such as decarburization and cracking are greatly reduced. After the reduction of finishing, the utilization of materials and machining efficiency are improved. Vacuum heating gas quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve quality, reduce distortion, and increase life. The heat treatment quality control of bearing parts is the most stringent in the entire machinery industry. Bearing heat treatment has made great progress in the past 20 years, mainly in the following aspects: the study of heat treatment basic theory; heat treatment process and application technology research; new heat treatment equipment and related technology development.