基于不确定理论的丝杠预紧力退化可靠性建模  

Preload Degradation Reliability Modeling of Ball Screw Based on Uncertainty Theory

作　　者：龚梦辉 周长光 周华西 韩军[1] 冯虎田[1,2] GONG Meng-hui;ZHOU Chang-guang;ZHOU Hua-xi;HAN Jun;FENG Hu-tian(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China;Key Laboratory of Performance Test Evaluation and Reliability Technology for Functional Components of CNC Machine Tools,Suzhou 215600,China)

机构地区：[1]南京理工大学机械工程学院,南京210094 [2]数控机床功能部件性能测试评价与可靠性技术重点实验室,苏州215600

出　　处：《组合机床与自动化加工技术》2022年第6期123-128,共6页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：国家重大专项(2018ZX040039001);国家自然科学基金(51905274)。

摘　　要：基于不确定理论,通过建立预紧力加速退化模型和可靠性模型,开展加速退化试验,对未知参数进行估计,提出了一种考虑认知不确定性的滚珠丝杠副寿命可靠度模型。通过该模型,对丝杠寿命的可靠性进行了分析,得出了可靠性随寿命和应力水平变化的趋势。分析可知,随着寿命的增加,可靠度先保持不变,然后急剧下降,最后缓慢下降,且当初始预紧力一定时,应力水平和寿命越大,其可靠度越小。Based on the uncertainty theory,a life reliability model of ball screw pair considering cognitive uncertainty was proposed by establishing preload accelerated degradation model and reliability model,carrying out accelerated degradation test and estimating unknown parameters.Through this model,the reliability of lead screw life is analyzed,and the trend of reliability with life and stress level is obtained.The analysis shows that with the increase of the life,the reliability first stays constant,then sharply decreases,and finally slowly decreases.When the initial preload is constant,the greater the stress level and life,the lower the reliability.

关 键 词：滚珠丝杠副 预紧力退化 加速退化试验 不确定理论 可靠性模型 

分 类 号：TH161[机械工程—机械制造及自动化] TG502[金属学及工艺—金属切削加工及机床]