钛合金切削表面残余应力影响因素及参数优化

Influencing Factors and Parameter Optimization of Residual Stress in Titanium Alloy Cutting Surface

钛合金切削过程具有温度高、摩擦力大、刀具严重磨损等缺点。为了减少钛合金表面出现微小裂纹,基于国内外研究现状,以Ti6Al4V切削表面残余应力为研究对象,建立了钛合金切削有限元模型。讨论了切削速度、切削深度、每齿进给量、不同切削用量对切削表面残余应力的影响。建立了切削表面残余应力回归模型,并采用混合遗传退火算法对切削参数进行优化,得到了最优切削参数组合。研究表明:切削速度增加,钛合金表面残余应力增加;切削深度对残余应力的影响较小;残余应力随着每齿进给量增加而减小。

In order to reduce the micro cracks on the surface of the titanium alloy, based on the research status at home and abroad, the finite element model of the titanium alloy cutting process was established using the residual stress of the Ti6Al4V cutting surface as the research object. The effects of cutting speed, cutting depth, feed rate and cutting parameters on the residual stress in cutting surface were discussed. The regression model of residual stress in the cutted surface was established, and the cutting parameters were optimized by the mixed genetic annealing algorithm. The research rersults show that the residual stress in the surface of titanium alloy increases with the increase of the cutting speed, the effect of cutting depth on the residual stress is small, and the residual stress decreases with the increase of feed rate per tooth.