Bearing processing heat treatment process and skill application

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Bearing processing heat treatment process and skill application

Source: China Bearing Network Time: 2017-12-09

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Heat treatment process (1) Sanitary heat treatment Wastewater, waste gas, waste salt, dust, noise and electromagnetic radiation, which are composed of heat treatment, will pollute the environment. Dispose of environmental pollution problems of heat treatment; implement sanitary heat treatment (or It is one of the directions for the development of heat treatment skills in developed countries. It is to reduce the emissions of SO2, CO, CO2, dust and cinder; it has completely eliminated the use of coal as fuel; the use of heavy oil is also less and less; Most of the light oil is used; 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-to-fuel ratio ensure the rational incineration; the reduction of NOx and CO to the minimum, the use of gas carburizing, carbonitriding And vacuum heat treatment skills instead of salt bath disposal to reduce the waste salt and CN-toxic substances on the water source pollution, the choice of water-soluble quenching oil instead of some quenching oil; the use of biodegradable vegetable oil instead of 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 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 oxidizing 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 improved; the disadvantages of heat treatment such as decarburization, cracking, etc. Reduction; reduction of finishing allowance after heat treatment; improved 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 improve life.
The application of heat treatment skills (1) expands the scale of GCr15 steel operation; usually GCr15 steel M quenching ferrule useful wall thickness below 12mm; but BL quenching can be strong because of salt cooling; if mixing, stringing, adding water And other methods; the useful wall thickness of the ferrule can be extended to about 28mm.
(2) The hardness is stable and uniform. Because the BL transformation is a slow process; usually GCr15 steel takes 4h; GCr18Mo steel takes 5h; the ferrule is isothermal in the long time in the nitrate salt; the outer core arrangement changes simply together; thus the hardness is stable Uniformity is good; usually GCr15 steel BL after quenching hardness of 59 ~ 61HRC, uniformity ≤ 1HRC; unlike quenching when the ferrule wall thickness is slightly larger, it presents low hardness, soft point, poor uniformity and other problems.
(3) Reducing quenching and grinding cracks in the production of railway and rolling mill bearings; because the ferrules are large in scale and heavy in weight; M is brittle when oil quenching; strong cooling is often adopted to achieve high hardness after quenching; Microcracking, while BL quenching; because BL arrangement is much better than M arrangement; together with the external composition of compressive stress of -400 ~ -500MPa; greatly reduced the tendency of quenching crack, the external compressive stress is offset during grinding Some grinding stress; reduce the overall stress level; greatly reduce the grinding crack.
(4) The service life of the bearing is improved. The railway, the rolling mill bearing, etc., which accept the large impact load; the primary failure mode after the M quenching is: the inner sleeve is cracked during installation; the outer ring is damaged by the impact of the outer ring during the process. The ring is broken; the austempered bearing has good impact resistance and external compressive stress; no matter whether the inner sleeve is cracked during installation, it is still used in the process of the casing to stop the block, and the tendency of the inner sleeve to be broken is greatly reduced.咴 咴 α α. Therefore; after the isothermal quenching than M quenching after the average life and reliability progress.
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