基于预应力加工的螺杆残余应力分布研究  

Residual stress distribution of screw by pre-stress machine

作　　者：覃孟扬[1] 徐兰英[1] 罗永顺[1] 喻菲菲[1] 周莉[1] 

机构地区：[1]广东技术师范学院机电学院,广州510665

出　　处：《现代制造工程》2016年第4期26-30,156,共6页Modern Manufacturing Engineering

基　　金：国家自然科学基金资助项目(51375101);广东省自然科学基金项目(2015A030313)

摘　　要：预应力车削是一种可以调整工件表面残余应力的加工方法,为了了解预应力对螺杆结构加工残余应力分布的影响,对螺杆不同部位预应力分布进行理论分析,并推导相应的计算公式,通过加载不同预应力的螺杆预应力车削试验,证明了螺杆预应力对残余应力分布的作用,并分析对比预应力以及残余应力的变化,试验结果验证了理论的准确性。结合螺杆疲劳破坏的产生特点,讨论预应力分布对疲劳强度的影响,认为预应力车削有利于提高螺杆疲劳强度。Pre-stress machine is a processing methods which can adjust residual stress of workpiece. In order to understand screw residual stress distribution by pre-stress machine, pre-stressed distributed in different places of a screw was theoretically analyzed and derived corresponding calculation formulas. Screw turning experiments loaded with different pre-stress proved the effect of pre-stress of screw to distribution of residual stresses, and then change between pre-stress and residual stress was analyzed and compared. The experimental results verified accuracy of above theory analysis. Finally,it was discussed that the effect of pre-stress distribution to fatigue strength, and it was thought that pre-stress machine is helpful to improve fatigue strength of screw.

关 键 词：螺杆加工 预应力加工 加工残余应力 疲劳强度 

分 类 号：TG62[金属学及工艺—金属切削加工及机床]