Reliability Evaluation and Design Method of Rolling Bearings Under Stress-strength Interference Model
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摘要: 针对滚动轴承可靠性低、缺乏设计依据等问题,提出一种应力-强度干涉模型下的滚动轴承可靠性评估与设计方法。考虑滚动轴承实际承载当量动载荷和规定当量动载荷的随机特性,假设两者为服从对数正态分布的随机变量,建立滚动轴承可靠性评估与设计模型。其次,对多型号多工况下的深沟球轴承和角接触球轴承进行仿真验证,结果表明:本文提出的滚动轴承可靠性评估与设计方法,通过分析当量动载荷的许用范围,结合轴承设计公式可以使优化后的轴承满足在该工况下的目标可靠性寿命,准确有效的实现滚动轴承的可靠性评估与设计。Abstract: Aiming at the low reliability and lack of design basis of rolling bearings, a reliability evaluation and design method of rolling bearings under stress-strength interference model was proposed. Considering the random characteristics of the actual equivalent dynamic load and the specified equivalent dynamic load, and assuming that the two random variables subject to lognormal distribution, the reliability evaluation and design model for rolling bearings was established. Secondly, the simulation verification is carried out for the deep groove ball bearings and angular contact ball bearings under multiple models and conditions. The results show that the reliability evaluation and design method of rolling bearing proposed in this paper can make the optimized bearing meet the target reliability life under this working condition by analyzing the allowable range of equivalent dynamic load and combining with the bearing design formula, and achieve the reliability evaluation and design of rolling bearing accurately and effectively.
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表 1 滚动轴承仿真型号
Table 1. Rolling bearing simulation model numbers
轴承 深沟球轴承 角接触球轴承 1 6005-SKF 7005C(High Accurate)-Koyo2015 2 6007-FAG 7006(High Accurate)-Koyo2015 3 6008-SKF 7008C FY-Koyo2015 表 2 滚动轴承仿真工况
Table 2. Rolling bearing simulation working conditions
工况编号 当量动载荷/N 转速/(r·min−1) 1 1000 12000 2 1500 12000 3 2000 12000 表 3 深沟球轴承仿真寿命
Table 3. Deep groove ball bearing simulation life
工况编号 仿真寿命/h 6005-SKF 6007-FAG 6008-SKF 1 1952 6019 6950 2 578 1783 1952 3 243 752 823 表 4 角接触球轴承仿真载荷
Table 4. Angular contact ball bearing simulation loads
当量动载荷/N 轴向载荷/N 7005C 7006 7008C 1 000 850 1314 772 1 500 1372 1972 1232 2 000 1963 2630 1712 表 5 角接触球轴承仿真寿命
Table 5. Angular contact ball bearing simulation life
工况编号 仿真寿命/h 7005C 7006 7008C 1 5 069 8 353 23 547 2 1 503 2 477 6 954 3 633 1 045 2 946 表 6 深沟球轴承寿命分析
Table 6. Deep groove ball bearing life analysis
轴承型号 仿真平均寿命/h 可靠性评估寿命/h 6005-SKF 924 749 6007-FAG 2 851 1 925 6008-SKF 3 241 2 109 注:轴承转速为12 000 r/min,承受的当量动载荷为1 000~2 000 N。 表 7 角接触球轴承寿命分析
Table 7. Angular contact ball bearing life analysis
轴承型号 仿真平均寿命/h 可靠性评估寿命/h 7005C 2 401 1 624 7006 3 958 2 680 7008C 11 149 7 548 注:轴承转速为12 000 r/min,承受的当量动载荷为1 000 ~ 2 000 N。 -
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