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The heat treatment quality will directly affect the machining quality of the follow-up that ultimately affect the performance and life of parts, and the heat treatment is consumption and pollution large large machinery industry energy. In recent years, with the progress of science and technology and its application in thermal processing, heat treatment technology is mainly reflected in the following aspects:
(1) clean heat treating wastewater, waste gas, waste production of salt, dust, noise and the electromagnetic radiation will cause pollution to the environment. To solve the pollution problems in heat treatment, carry out clean heat treatment (or green heat treatment) is the direction of heat treatment technology development in developed countries. In order to reduce SO2, CO, CO2, dust and cinder emissions, has been basically put an end to the use of coal as fuel, use of heavy oil is less and less, the majority of diesel oil, natural gas is still the most ideal fuel. Combustion has reached a very high level of furnace waste heat, than strict control ensures the premise of reasonable combustion combustion optimization and empty - burner structure, make NOX and CO decreased to the minimum; the use of gas carburizing, carbonitriding and vacuum heat treatment technology to replace the salt bath treatment to reduce the waste salt and water CN- toxic pollution of water sources; the synthesis of water-soluble quenching oil instead of part of quenching oil, using biodegradable vegetable oil instead of part of mineral oil to reduce oil pollution.
(2) precision heat treatment has two meanings: one is according to the requirements of the use of materials, parts, structure size, using the physical metallurgical knowledge and advanced computer simulation and detection technology, optimization of process parameters, to achieve maximum performance or desired exerts the potential of materials; on the other hand is fully guaranteed stability optimization of the process, product quality dispersion is very small (or zero) and heat treatment distortion is zero.
(3) the heat treatment of energy-saving scientific production and energy management is the most potential factors for the efficient use of energy, the establishment of professional heat treatment plant in order to ensure the full load production, make full use of the equipment ability is scientific management options. In the heat treatment energy structure, selection of an energy priority; make full use of waste heat, waste heat; the technology of low energy consumption, short cycle instead of long cycle, high energy consumption of the process.
(4) without or little oxidation heat treatment by using protective atmosphere heating alternative oxidative atmosphere heating to precise control of carbon potential, nitrogen potential controlled atmosphere heating, part performance can be improved after heat treatment, heat treatment defects such as decarburization, crack greatly reduced after heat treatment, machining allowance to reduce, increase the rate and the machining efficiency of the use of the material. Heating in vacuum gas quenching, vacuum or low pressure carburizing, nitriding, nitrocarburizing and boronizing, can significantly improve the quality, reduce the distortion, and increased life expectancy.
The heat treatment quality KOYO bearings parts of the control in the whole machinery industry is the most stringent. KOYO bearing heat treatment has made great progress in the past 20 years, mainly in the following aspects: the research of basic theory of heat treatment; heat treatment technology and application technology; development of new heat treatment equipment and related technology.
| Product Model | Inside Diameter | Outside Diameter | Thickness |
| 7340BDB NSK | 200 | 420 | 80 |
| 7340ADB NSK | 200 | 420 | 80 |