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The quality of heat treatment is directly related to the quality of subsequent processing, which ultimately affects the performance and life of parts. At the same time, heat treatment is also a major energy consumer and a major polluter in 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. Clean heat treatmentWaste water, waste gas, waste salt, dust, noise and electromagnetic radiation formed by heat treatment production will cause pollution to the environment. To solve the environmental pollution problem of heat treatment, the implementation of clean heat treatment (or green environmental heat treatment) is one of the development directions of heat treatment technology in developed countries. In order to reduce the emissions of SO2, CO, CO2, dust and coal slag, the use of coal as fuel has been basically eliminated, and the use of heavy oil has become less and less. The majority of light oil is used. Natural gas is still the most ideal fuel. The waste heat utilization of the burner has reached a very high level. The optimization of the burner structure and the strict control of the air-fuel ratio ensure that NOx and CO are reduced to a minimum under the premise of reasonable combustion; the use of gas carburization and carbonitriding And vacuum heat treatment technology is used to replace salt bath treatment to reduce the pollution of waste water and CN-toxic substances to water sources; water-soluble synthetic quenching oil is used to replace part of the quenching oil, and biodegradable vegetable oil is used to replace part of the mineral oil to reduce oil pollution.
2. Precision heat treatmentPrecision heat treatment has two meanings: on the one hand, it uses physical metallurgical knowledge and advanced computer simulation and testing technology to optimize process parameters according to the use requirements, materials, and structural dimensions of the parts, to achieve the required performance or maximize the use of materials On the other hand, it is sufficient to ensure the stability of the optimized process, to achieve a small (or zero) product quality dispersion and zero heat treatment distortion.
3. Energy-saving heat treatmentScientific production and energy management are the most potential factors for efficient use of energy. Establishing a professional heat treatment plant to ensure full production and give full play to equipment capabilities is the choice of scientific management. In terms of heat treatment energy structure, primary energy is preferred; full use of waste heat and waste heat; low energy consumption and short cycle technology is used to replace long cycle and high energy consumption technology.
4. Less oxidation-free heat treatmentFrom the use of protective atmosphere heating instead of oxidizing atmosphere heating to controlled atmosphere heating with precise control of carbon potential and nitrogen potential, the performance of parts after heat treatment is improved, heat treatment defects such as decarburization and cracks are greatly reduced, and the amount of finishing after heat treatment is reduced , Improve the utilization rate of materials and machining efficiency. 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. SKF bearing heat treatment has made great progress in the past 20 years, mainly manifested in the following aspects: heat treatment basic theory research; heat treatment process and application technology research; new heat treatment equipment and related technology development.
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The internal factors mainly refer to the three major factors that determine the quality of the bearing, such as structural design, manufacturing technology and material quality.
First of all, with reasonable structural design and advanced nature, long bearing life will be achieved. The manufacture of bearings generally involves multiple processing procedures such as forging, heat treatment, turning, grinding and assembly. The rationality, advancement and stability of each processing technology will also affect the life of the bearing. Among them, the heat treatment and grinding processes that affect the quality of the finished bearing are often more directly related to the failure of the bearing. In recent years, studies on the deteriorating layer of the bearing working surface show that the grinding process is closely related to the bearing surface quality.
The metallurgical quality of FAG bearing materials used to be the main factor affecting the early failure of rolling bearings. With the progress of metallurgical technology (such as vacuum degassing of bearing steel, etc.), the quality of raw materials has been improved. The proportion of raw material quality factors in bearing failure analysis has decreased significantly, but it is still one of the main factors affecting bearing failure. The proper selection of materials is still a factor that must be considered in bearing failure analysis.
The main task of FAG bearing failure analysis is to find out the main factors causing bearing failure based on a large number of background materials, analysis data and failure modes, so as to propose improvement measures to extend the service life of the bearing and avoid sudden occurrence of the early failure for bearing.
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