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The fundamental functional requirements of bearing steel
Source: China Bearing Network Time: 2018-05-25
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The fundamental requirement of the rolling bearing for the data depends to a large extent on the working function of the bearing. The choice of the material for making the rolling bearing is suitable; it will have a great influence on its function and life. Under normal conditions; the primary damage of the rolling bearing The method is fatigue shedding under the effect of alternating stress; and the loss of bearing precision due to conflicting wear. In addition; cracks, indentations, rust, etc. cause abnormal damage of the bearing. Therefore; the rolling bearing should have high resistance Plastic deformation ability; less conflict wear; outstanding rotation accuracy, outstanding scale accuracy and stability; and long touch fatigue life. And many of the functions are determined by the data and heat treatment process. Because of the rolling bearing data The fundamental need is determined by the damage method of the bearing; therefore, the information required to make the rolled bearing should have the following functions after the necessary heat treatment in the subsequent process:
A high touch fatigue strength touch fatigue damage is the primary method of normal bearing damage. Rolling bearing operation; the rolling body rolls between the inner and outer ring raceways; the touch is somewhat cyclical alternating load; many can be used per minute Hundreds of thousands of times; under the repeated effect of cyclical alternating stress; the appearance of the touch is exhausted. When the beginning of the rolling bearing appears to fall off, it will cause the bearing to oscillate, and the noise will increase sharply; the end of the bearing will be damaged; The method is called touch fatigue damage. Therefore; steel for demand rolling bearings should have high touch fatigue strength.
Two high wear-resistant roll bearings are in normal operation; in addition to the occurrence of rollover conflicts; there is also a sliding conflict. The primary part of the slip collision is: the touch surface between the roll and the raceway, the roll and the cage pocket Between the touch surface, between the cage and the ferrule guide rib, and between the roller end face and the ferrule guide rib, etc. The existence of the sliding conflict in the rolling bearing inevitably causes the bearing parts to wear out. If the bearing steel Poor wear resistance; the rolling bearing will lose the accuracy too early due to wear or the bearing oscillation will increase due to the decrease of the rotation precision, and the life expectancy will decrease. Therefore, the bearing steel should have high wear resistance.
Three high elastic limit rolling bearing operation; because the touch area between the rolling body and the ferrule raceway is very å²¢ 诔惺 诔惺 墒 墒 墒 墒 墒 墒 墒 墒 墒 墒 笤 笤 笤 笤 笤 笤 笤 笤 笤 笤 笤 笤 笤 笤 笤 ç¬¤ç »å¨´æ…•å“Ÿãƒ‘æ²½è‰½. In order to avoid excessive plastic deformation under high touch stress; loss of bearing accuracy or attack surface crack; therefore; demand bearing steel should have high elastic limit.
Four suitable hardness and hardness are one of the important goals of the rolling bearing. It has close contact with the data touch fatigue strength, wear resistance and elastic limit; it directly affects the life of the rolling bearing; the hardness of the bearing is generally based on the bearing receiving load. The method and the overall condition of the size, bearing scale and wall thickness are determined. The hardness of the steel for the rolling bearing should be suitable; too large or too small will affect the bearing life. It is well known that the primary failure method of the rolling bearing is touch fatigue damage. And loss of bearing accuracy due to poor wear resistance or scale instability, bearing parts lacking certain tolerance; when receiving large impact loads, they will cause damage to the bearings due to the occurrence of brittle fractures. Therefore; must be based on the bearing Specific conditions and damage methods to determine the hardness of the bearing. About the loss of bearing accuracy due to fatigue loss or poor wear resistance; bearing parts should use higher hardness, for bearings that accept large impact loads (such as rolling mills: bearings, Railway bearings and some automotive bearings, etc.; should be properly lowered to improve the bearing's resistance is very necessary.
Five must-have impact resistance Many rolling bearings are subjected to a set impact load during use; therefore, bearing steel is required to have certain tolerance; to ensure that the bearing is not damaged by impact. Bearings that accept large impact loads such as rolling mill bearings, railways Bearings and other demand data have relatively high impact resistance and fracture resistance; some of these bearings are treated with bainite quenching heat treatment; some use carburized steel data; in order to ensure that these bearings have better impact resistance.
Six outstanding scale stability rolling bearings are fine mechanical parts; their accuracy is based on micrometers. In the long-term storage and operation process; changes in the connotation arrangement or stress changes will lead to changes in bearing scale; Loss accuracy. Therefore; to ensure the dimensional accuracy of the bearing; bearing steel should have outstanding dimensional stability.
Seven outstanding anti-rust function rolling bearing production process is complicated; the production cycle is long; some semi-products or product parts need to be registered for a long time before installation; therefore; bearing parts are in production or in product storage It is easy to have a certain rust; especially in the humid air. Therefore; the bearing steel needs to have outstanding rust prevention.
Eight outstanding process functions roll bearing in the production process; its parts have to go through multiple cold and hot processing steps. This requires bearing steel to have outstanding process functions; such as cold and hot forming functions; cutting and grinding functions and Heat treatment function, etc.; in order to meet the needs of high-volume, high-efficiency, low-cost and high-quality production of rolling bearings.
In addition; for the use of bearings under special operating conditions; in addition to the above several basic needs; the use of steel must also propose corresponding special functional requirements; such as high temperature resistance, high speed function, corrosion resistance and antimagnetic function.
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