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Reasons and Countermeasures for Common Cracks in NSK Bearings
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Treatment and preventive measures: Eliminate the banding and segregation arrangement of carbides in raw materials; prohibit over-consumption of impurities, reasonably formulate heat treatment process parameters, and eliminate human manipulation elements as much as possible.
2. Characteristics and composition conditions of quenching cracks of special-shaped cracks: often occur in unhardened parts or carburized parts; cracks are located at sharp corners of parts and thicknesses.
Treatment and preventive measures: Guan I is a reasonable preparation of heat treatment process parameters, improve the operator's operating technology; try to remove artificial operating elements, design as much as possible with arc transition; prevent sharp corners.
3, mesh cracks (also known as cracks) quenching crack characteristics and composition conditions: the surface is easy to attack such cracks. High hardness parts, chemical heat treatment parts, high frequency quenching parts are also often cracked; cracks in parts Appearance; depth is about 0. 005 ~ 0. 02mm.
The professor supplies us with partial treatment of the reticular crack condition and preventive measures: the tempering after heat treatment should be sufficient, and the amount of cutting during grinding should be.
4, peeling crack crack characteristics and composition conditions: often presented in the external quenching parts or chemical heat treatment parts. The peeling layer is the transition zone.
Treatment and preventive measures: Immediate tempering after quenching, reasonable selection of quenching heating parameters and cooling medium.
5, microscopic cracks The cause of such cracks is more complicated.
Crack characteristics and composition conditions: often presented in the shortcomings of high carbon steel needle martensite, austenite grain boundary and crystal memory.
Treatment and preventive measures: to ensure that the chemical composition and arrangement of the raw materials are in a normal condition, the heat treatment process parameters should be strictly controlled, the operator should continuously improve the technology; compensate some unforeseen elements; prevent the occurrence of cracks.
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