基于LS-DYNA的金属切削加工有限元分析  

Finite Element Analysis of Metal Cutting Process Based on LS-DYNA

作　　者：宿崇[1] 侯俊铭[1] 朱立达[1] 王宛山[1] 

机构地区：[1]东北大学机械工程与自动化学院,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2008年第9期1334-1337,共4页Journal of Northeastern University(Natural Science)

基　　金：教育部高等学校博士学科点专项科研基金资助项目(20060145017)

摘　　要：采用有限元法对金属的切削加工过程进行了模拟,得出了工件内部应力、应变及温度的变化规律.模拟结果表明,切屑是切削层材料受到刀具前刀面的推挤,沿某一斜面发生剪切滑移形成的;切削进入稳定阶段后,材料的最大等效应力保持在某一值附近波动;钝圆半径的挤压导致成形表面产生残余应力;切削热主要集中在切屑上,切屑温度从切屑底层到外层逐渐递减.该方法弥补了实验方法冗繁的缺点,为金属切削原理的研究、切削加工工艺的设计提供了高效的方法和理论依据.The finite element method is used with the software LS-DYNA to simulate metal cutting process so as to investigate how the stress,strain and temperature change in workpiece.The simulation results show that the chip formation process is actually a plastic deformation process in which the tool rake presses cutting layer material along a slope to form the shearing slip.The maximum effective stress fluctuates around a constant value during stable cutting,and the residual stress in formed workpiece surface results from the pressing force due to rounded cutting edge.The cutting heat is mainly kept in the chips,while the cutting temperature decreases gradually from the inner to the outer layers of chips.The method proposed,as an ancillary means to shorten the time for the lengthy and tedious experiments,will provide an effective way and theoretical reference for the study on the principle of metal cutting and design of the relevant technological process.

关 键 词：金属切削 有限元法 残余应力 切削温度 

分 类 号：TG501[金属学及工艺—金属切削加工及机床]