标题：Fatigue test and failure analysis of GD8020×1100 ball screw unit
作者：Yan Y.; Li C.N.; Gai Y.H.; Li B.M.; Du W.; Li M.S.
作者机构：[Yan, Y] Key Laboratory of Ministry of Education, Liquid-Solid Structural Evolution and Processing of Materials, Shandong University, Jinan, Shandong, 更多
通讯作者：Li, M S(email@example.com)
通讯作者地址：[Li, M. S] Key Laboratory of Ministry of Education, Liquid-Solid Structural Evolution and Processing of Materials, Shandong University, Jinan, Shandon 更多
来源：Applied Mechanics and Materials
关键词：Ball screw unit; Contact fatigue; Failure analysis; Fatigue test; Surface hardened layer depth
摘要：By means of chemical composition testing, scanning electron microscopy observation, metallographic observation and hardness gradient detection etc, analysis of the typical failure samples from a well-known brand GD8020×1100 ball screw unit in the fatigue test was carried on. Results show that there is no obvious surface wear of the ball screw, showing the normal contact fatigue failure. But severe surface wear happens on the raceway of nut A with obvious flaking and many local cracks; which is the main reason leading to the failure of ball screw unit. So effective measures to avoid earlier failure of the ball screw unit can be put forward by controlling the steel quality strictly and improving the hardness and depth of the hardened layer on the raceway of nut A. © (2014) Trans Tech Publications, Switzerland.