基于应变梯度理论的微切削毛刺仿真研究  

Research on Micro-cutting Burr Based on Strain Gradient Theory

作　　者：王全意 丁辉[1] 程凯[1] 赵亮[1] Wang Quanyi;Ding Hui;Cheng Kai;Zhao Liang(School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学

出　　处：《工具技术》2019年第4期12-15,共4页Tool Engineering

基　　金：科学挑战计划(TZ2018006)

摘　　要：在微切削过程中,为了更准确地研究材料尺寸效应对毛刺高度和宽度产生的影响,基于应变梯度理论对传统的Johnson-Cook本构模型进行修正,然后通过用户子程序vumat将其导入ABAQUS有限元软件进行出口毛刺仿真。通过仿真结果可知:在考虑材料尺寸效应的条件下,随着切削厚度的增加,剪切变形区内最大应力值会减小,并向不考虑材料尺寸效应时的最大应力值靠近;在考虑材料尺寸效应的条件下,水平方向上的切削力会变大,进而导致出口毛刺的高度值和宽度值均大于不考虑材料尺寸效应时的对应值。In the micro-cutting process,in order to more accurately study the effect of material size effect on the height and width of the burr,the traditional Johnson-Cook constitutive model is corrected based on the strain gradient theory,and then introduced it into the finite element software ABAQUS by using the subroutine vumat to simulate the exit burr.The simulation results show that taking material size effect into account,the maximum stress value in the shear deformation zone will decrease with the increase of the cutting thickness,and the maximum stress value will be approached when the material size effect is not considered.Taking the material size effect into account,the cutting force in the horizontal direction becomes larger,and the height value and the width value of the exit burr are both larger than the corresponding values when the material size effect is not considered.

关 键 词：应变梯度理论 材料尺寸效应 出口毛刺 

分 类 号：TG506.9[金属学及工艺—金属切削加工及机床] TH161[机械工程—机械制造及自动化]