滚珠丝杠副关键加工尺寸误差与预紧转矩关系研究  

Research on relationship between key machining dimensional error and preload torque of ball screw

作　　者：刘东 祖莉[1] 林炜国 Liu Dong;Zu Li;Lin Weiguo(School of Mechanical Engineering y Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《仪器仪表学报》2021年第11期17-26,共10页Chinese Journal of Scientific Instrument

基　　金：国家科技重大专项(2018ZX04039001)项目资助。

摘　　要：预紧转矩是决定滚珠丝杠副可靠性的重要影响因素,目前预紧转矩的计算主要依据经验公式,理论计算值与实际预紧转矩值误差较大。为了准确计算滚珠丝杠副的预紧转矩,基于接触变形和载荷分布理论,分析关键加工尺寸误差对预紧转矩的影响,建立中径误差、导程误差与滚珠丝杠副预紧转矩关系模型。利用滚珠丝杠副导程误差、型面检测试验台测量不同型号丝杠副的导程误差、中径值,通过导程误差、中径误差计算滚珠丝杠副的预紧转矩理论值。利用滚珠丝杠副预紧转矩试验台测量预紧转矩实际值,测量结果表明预紧转矩的理论计算值与试验值的相对误差为0.65%~12.18%,均小于前人模型的15.07%~43.57%,理论模型与实际预紧转矩的一致性较好,验证理论模型的正确性。The preload torque is an important factor that affects the reliability of the ball screw.At present,the calculation of preload torque is mainly based on the empirical formula.There is a large error between the theoretical calculation value and the actual preload torque value.To calculate the preload torque of the ball screw accurately,based on the contact deformation and load distribution theory,the influence of key machining dimensional errors on the preload torque is analyzed.The relationship model among pitch diameter error,lead error and preload torque of ball screw is formulated.The lead error and pitch diameter of different types of ball screws are measured by the ball screw lead error and the profile detection test bench.The theoretical value of preload torque of ball screw is calculated through the lead error and pitch diameter error.The actual value of preload torque is measured by the preload torque test-bed of ball screw.The measurement results show that the relative error between the theoretical calculation value of preload torque and the test value is 0.65%~12.18%,which is less than 15.07%~45.57%of the existing models.The consistency between the theoretical model and the actual friction torque is accurate.The correctness of the theoretical model is verified.

关 键 词：滚珠丝杠副 关键加工尺寸误差 预紧转矩 中径误差 导程误差 

分 类 号：TH161[机械工程—机械制造及自动化]