Foreign bearing heat treatment skills

Source: China Bearing Network Time: 2018-07-26

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The quality of heat treatment is directly related to the subsequent processing quality, which affects the function and life of the parts at the end; together with heat treatment, it is the power consumption and pollution of the machinery industry. These years; following the advancement of scientific skills and its heat The use of disposal; the development of heat treatment skills is now the following:
(1) Sanitary heat treatment Wastewater, waste gas, waste salt, dust, noise and electromagnetic radiation, which are produced by heat treatment, will cause pollution to the environment. Disposal of environmental pollution problems of heat treatment; implementation of sanitary heat treatment (or green heat treatment) Disposal) is one of the directions for the development of heat treatment skills in developed countries. In order to reduce the emissions of SO2, CO, CO2, dust and cinders, coal has been used as a fuel; the use of heavy oil is also less and less; Natural gas is still the most ideal fuel. The use of waste heat in incinerators has reached a high level; the optimization of the layout of the incinerator and the strict control of the air-fuel ratio ensure the rational incineration; the minimum of NOX and CO is reduced. Limit, use gas carburizing, carbonitriding and vacuum heat treatment skills instead of salt bath disposal to reduce the pollution of waste water and CN-toxic substances to water sources, use water-soluble quenching oil instead of some quenching oil; use biodegradable Vegetable oil replaces some mineral oil to reduce oil pollution.
(2) Fine heat treatment Fine heat treatment has two aspects: on the one hand, according to the application requirements of the parts, data, layout scale; using physical metallurgy common sense and leading computer simulation and detection skills; optimizing process parameters; Functional or maximum limit to promote the potential of the data, on the other hand is to ensure the stability of the optimization process; the product quality dispersion is small (or zero) and the thermal treatment distortion is zero.
(3) Energy-saving heat treatment Scientific production and power management are the most promising factors for the useful use of power; establishing a professional heat treatment plant to ensure full-load production and abundant development of equipment can be the selection of scientific management. Priority is given to selecting a power, using waste heat and waste heat, and selecting a process with low energy consumption and short cycle to replace the long cycle and high energy consumption process.
(4) Less oxidation-free heat treatment is heated by a controlled atmosphere heating instead of an oxidizing atmosphere to control the carbon potential and nitrogen potential in a controlled atmosphere; the function of the parts after heat treatment is advanced; the disadvantages of heat treatment such as decarburization, cracking, etc. Reduction; reduction of finishing allowance after heat treatment; advancement of data utilization rate and machining power. Vacuum heating gas quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boronizing can significantly improve quality Reduce distortion and advance life.
The thermal handling quality of bearing parts is the most severe in the entire machinery industry. Bearing heat treatment has made great progress in the past 20 years; the first table is now the following aspects: the discussion of the basic theory of heat treatment, heat treatment Research on process and application skills, development of new heat treatment equipment and related skills.

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