温度对Ti-6Al-4V切削比能尺寸效应的影响  

Influence of Temperature on the Scaling Effect of Specific Cutting Energy of Ti-6Al-4V

作　　者：叶贵根[1] 李新建 张彭 薛世峰[1] YE Guigen;LI Xinjian;ZHANG Peng;XUE Shifeng(College of Pipeline and Civil Engineering,China University of Petroleum,Qingdao 266580,Shandong,China)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院,山东青岛266580

出　　处：《华南理工大学学报（自然科学版）》2022年第6期129-136,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(11972376);山东省自然科学基金资助项目(ZR2019MA007);中国石油大学(华东)中央高校基本科研业务费专项资金资助项目(19CX02032A,22CX03014A);中国石油大学(华东)研究生创新工程资助项目(YCX2021095)。

摘　　要：切削比能的尺寸效应现象是切削机理研究中最具挑战的问题之一,关于它的形成机理目前尚未达成共识,尤其是切削温度对尺寸效应的影响更是鲜有研究。文中对钛合金Ti-6Al-4V开展了不同初始温度下的正交切削实验,建立了正交切削有限元模型,探讨了温度对切削比能尺寸效应的影响。研究结果表明:尺寸效应现象与温度密切相关,工件初始温度越低,尺寸效应越显著;在主剪切区两端沿剪切方向存在两个温度梯度区,其长度与切削厚度无关;温度梯度区的存在使得主剪切区的平均温度随切削厚度的减小而下降,致使工件材料流动应力相应提高,从而导致切削比能的非线性上升。The scaling effect of specific cutting energy is one of the most challenging problems in metal cutting.There is no consensus reached on the mechanism of the scaling effect,and the contribution of the cutting temperature on the scaling effect was rarely studied.In this paper,orthogonal cutting experiments of Ti-6Al-4V at different initial temperatures were carried out,the finite element model of orthogonal cutting was established,and the effect of temperature on the scaling effect of specific cutting energy was discussed.The results show that the scaling effect is strongly linked to temperature,and the lower the initial temperature of the workpiece,the more significant the scaling effect is.There are two temperature gradient regions at both ends of the primary shear zone along the shear direction.The length of the gradient regions is unrelated to the thickness of the uncut chip.The existence of the temperature gradient regions causes the average temperature in the primary shear zone to drop with decreased uncut chip thickness,which gives rise to the increase of flow stress of workpiece material and the nonlinear increase of the specific cutting energy.

关 键 词：金属切削加工 正交切削 切削比能 尺寸效应 温度梯度 

分 类 号：TG501[金属学及工艺—金属切削加工及机床]