Research and experimental analysis on precision degradation of BSM at low speed(I): theory analysis  

作　　者：KONG Deshun GAO Xiangsheng LI Shilin LV Linbao 孔德顺(Institute of Standard Metrology,China Academy of Railway Sciences Corporation Limited,Beijing 100081,P.R.China;Beijing Huaheng Technology Co.Ltd.,Beijing 100081,P.R.China)

机构地区：[1]Institute of Standard Metrology,China Academy of Railway Sciences Corporation Limited,Beijing 100081,P.R.China [2]Beijing Huaheng Technology Co.Ltd.,Beijing 100081,P.R.China [3]Key Laboratory of Advanced Manufacturing Technology,Beijing University of Technology,Beijing 100124,P.R.China [4]Postgraduate Department,China Academy of Railway Sciences,Beijing 100081,P.R.China

出　　处：《High Technology Letters》2024年第4期356-369,共14页高技术通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China(No.51575014,51505020);Key Foundation Project of China Academy of Railway Sciences(No.2021YJ200).

摘　　要：In the structure of double-nut ball-screw mechanism(BSM),the contact angle of the ball-screw determines the relative positional relationship between the balls and the screw as well as the nut.The contact angle is related to geometrical parameters of the ball,the screw and the nut,which are also affected by the running status and the preload of the BSM.Considering the effect of the gy-roscopic moment on the ball in the raceway,the dynamic model of the ball in space is established under different speeds and different preloads of the BSM.By simulation of the dynamic model of the ball in space,the changing regularity of the contact angle,the helix angle,the drag torque and the mechanical efficiency of the BSM can be obtained under different speeds and different preloads.The results show that there is a nonlinear gradient relationship between contact angle,helix angle,the drag torque,the mechanical efficiency and the speeds of the ball-screw under different preloads.The contact angle is the key factor to affect the drag torque of the BSM.Through the analysis,it is found that establishing the ball dynamic model in space can better study the precision degradation law of the ball screw.

关 键 词：ball-screw mechanism(BSM) contact angle sliding friction drag torque dy-namics model precision degradation 

分 类 号：TG659[金属学及工艺—金属切削加工及机床]