奥氏体不锈钢多晶切削建模及毛刺仿真分析  

Polycrystalline Cutting Modeling and Burr Simulation Analysis of Austenitic Stainless Steel

作　　者：文嘉鑫 何林[1] 周滔 田鹏飞 周天 Wen Jiaxin;He Lin;Zhou Tao;Tian Pengfei;Zhou Tian

机构地区：[1]贵州大学机械工程学院,贵阳市550025

出　　处：《工具技术》2023年第10期69-75,共7页Tool Engineering

基　　金：国家自然科学基金(51765009,52165042);贵州大学引进人才科研项目(2021-21)。

摘　　要：在金属切削中加工尺度较小时,材料的尺寸效应、材料强化对流动应力的影响及毛刺的存在会严重影响已加工表面质量及尺寸精度,甚至会导致工件报废。基于应变梯度理论,通过子程序嵌入到ABAQUS软件中,构建二维多晶切削模型来探究不同刀具结构对毛刺形成的影响,并清楚观察到晶粒的塑性流动及变形过程。在对该模型的可行性进行验证后展开模拟分析发现,随着刀具前角的增大、切削刃钝圆半径的减小及倒角长度和倒角角度的减小,出口毛刺尺寸均会减小,而刀具后角的变化对毛刺尺寸影响极小,本研究为毛刺的控制及已加工表面质量的提高提供了新的思路。When the machining dimension is small in metal cutting,the size effect of material,the effect of material strengthening on flow stress and the existence of burrs will seriously affect the surface quality and dimensional accuracy,and even lead to scrapped workpiece.This study is based on the strain gradient theory and embeds it into ABAQUS through subroutines to construct a two-dimensional polycrystalline cutting model to explore the influence of different tool structures on burr formation.The plastic flow and deformation process of grains can also be clearly observed through this polycrystalline model.After verifying the feasibility of the model,simulation analysis is carried out.It is found that with the increase of tool rake angle,the decrease of arc radius of cutting edge and the decrease of chamfer length and chamfer angle,the exit burr size increases,while the change of tool clearance angle has little effect on the burr size.This study provides a new idea for burr control and the improvement of machined surface quality.

关 键 词：多晶模型 应变梯度 晶粒塑性流动 刀具结构 出口毛刺 

分 类 号：TG703[金属学及工艺—刀具与模具] TH161[机械工程—机械制造及自动化]