考虑刀具偏摆的微铣削力理论模型分析与研究  

Study on Cutting Tool Running out Considered Theoretical Analysis Model for Cutting Force Estimation in Micro End Milling Process

作　　者：苏玉龙[1] 董志国[1] 轧刚[1] 刘建成[1,2] 

机构地区：[1]太原理工大学机械工程学院,太原030024 [2]美国太平洋大学工程与计算机科学学院,美国加利弗尼亚95211

出　　处：《组合机床与自动化加工技术》2015年第3期38-43,共6页Modular Machine Tool & Automatic Manufacturing Technique

基　　金：山西省自然科学基金项目(2005-1051)

摘　　要：考虑微铣削加工过程中刀具偏摆的影响,建立了一种新的未变形切削厚度计算模型,为计算微铣削力做准备。将应变梯度塑性理论引入到材料的本构方程中,利用修正后本构方程来计算微铣削过程中的流动应力。在计算微铣削力时,应用了考虑刀摆的未变形切削厚度,并同时考虑了犁切力、流动应力和弹性恢复的影响。将理论计算得出的铣削力与实验测得的铣削力进行比较,进而验证模型的可行性。In this paper,a newnominal uncut chip thickness estimation algorithm for micro-scale end-milling is proposed,in which the combination of an exact trochoidal trajectory of the tool tip and the tool running-out is considered. The strain gradient plasticity theory is introduced into the constitutive equation of material to calculate the flowstress in the process of micro end milling. The uncut chip thickness is applied to calculate the cutting forces,where the influence of plough shear,the flowstress and the elastic recovery are considered. The calculated results showa satisfactory agreement with the results obtained from cutting experiments.

关 键 词：未变形切削厚度 刀具偏摆 尺寸效应 流动应力 

分 类 号：TH122[机械工程—机械设计及理论] TG506[金属学及工艺—金属切削加工及机床]