微铣削加工刀具刃口半径影响的有限元模拟  

Finite Element Simulation of Influence of Tool Edge Radius in Micro-milling

作　　者：张琢[1] 孙雅洲[2] 刘海涛[2] 梁迎春[2] 

机构地区：[1]哈尔滨工业大学机电工程学院,哈尔滨市硕士研究生150001 [2]哈尔滨工业大学

出　　处：《工具技术》2009年第9期33-36,共4页Tool Engineering

基　　金：国防基础科研资助项目(2320060098);黑龙江省博士后基金资助项目(LBH-Z06023)

摘　　要：为了分析合金钢40CrNiMoA微铣削过程中刀具刃口半径对工件受力情况的影响,采用Johnson-Cook材料模型和断裂失效模型作为工件材料模型和失效准则,采用热力耦合平面应变杂交单元并使用自适应网格技术进行网格划分,刀具与工件间的摩擦采用修正的库仑定律,进行微细铣削加工非线性弹塑性有限元模拟。通过有限元分析,得到了在相同切削速度和每齿进给量条件下,不同刃口半径下的Mises应力、最大剪应力及静水压应力的分布情况,并对结果进行了比较分析;同时讨论了实际负前角,为实际加工提供了依据。In order to analyze the influence caused by tool edge radius in micro-milling of alloy steel 40CrNiMoA, the John- son-Cook＇ s thermal coupling equation and shear failure law is employed as the material model and the failure criteria for the work- piece, the coupled plane strain thermal units and hybrid adaptive grid technology are used to mesh the workpiece＇ s elements, and the amended Coulomb＇ s law is used to analyze the friction between the tool and workpiece. Then the nonlinear elastic-plastic FE simulation is performed. Through FE analysis, the distribution of the Mises stress, maximum shear stress and hydrostatic stress un- der the same cutting speeds, same feed engagements and different tool edge radius are achieved. The results of FE simulation are compared and analyzed. At the same time, the actual negative rake angle is discussed, which provides a basis for the actual pro- cessing.

关 键 词：微铣削 切削刃半径 有限元方法 

分 类 号：TG814[金属学及工艺—公差测量技术]