高温合金高速切削锯齿形切屑应变与应变率研究

Strain and Strain Rate of Serrated Chip Generated by High Speed Cutting of Superalloys

在分析锯齿形切屑形成的基础上,将切屑单个锯齿视为梯形,建立梯形各顶点的应变和应变率计算解析模型。进行高速切削GH4169实验,并收集实验获得的切屑。运用解析模型,分析不同切削速度下,高温合金GH4169切屑的变形情况。实验结果表明:在切削速度200～1 000 m/min范围内,随着切削速度的增加,GH4169切屑变形程度增大,应变和应变率最大可分别达到4.91和4.59×106s-1。

An analytical model of vertex＇s shear strain and shear strain rate was developed based on the process of serrated chip formation with geometry shape of serrated chip as a trapezoid.The chip deformations under different cutting speeds for GH4169 were discussed with the proposed model.The results showed that with the cutting speed increasing,the degree of chip deformation increased.The maximums of strain and strain rate were respectively 4.91 and 4.59×106 s-1 with applied cutting speed range in 200～1 000 m/min.