直角切削的热力建模与仿真分析  

Thermomechanical modeling and simulation analysis of orthogonal cutting

作　　者：李炳林[1] 王学林[1] 胡于进[1] 李成刚[1] 

机构地区：[1]华中科技大学机械科学与工程学院,湖北武汉430074

出　　处：《华中科技大学学报（自然科学版）》2010年第12期121-125,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家重大基础研究发展计划资助项目(2009CB724306)

摘　　要：基于不等分剪切区模型,提出了一个直角切削的热力建模方法.在剪切区,用Johnson-Cook方程表示材料的本构关系,并建立了切屑通过剪切区的速度、应变、应力和温度的控制方程.在刀具/切屑面上,引入依赖切屑速度的摩擦经验公式.通过数值迭代方法计算出流动应力,并考虑了加工硬化和热软化对流动应力的影响.最后预测了各种不同加工条件下的切削力,并与已有文献的直角切削实验数据做比较,发现结果基本一致.提出的模型不需额外的测试,仅需要材料属性和切削条件就能预测出直角切削的切削力.A new thermomechanical method is presented based on the unequal division shear zone model for orthogonal cutting.The material constitutive relationship in the primary shear zone was represented using Johnson-Cook equation.The governing equation of the velocity,strain,stress and temperature of chip flow through the primary shear zone were established.At the tool/chip interface,a chip speed-dependent friction law was introduced.While calculating the flow stress iteratively,the effects of working hardening and thermal softening on flow stress were considered.Finally,predictive cutting forces for different machining econditions were compared with orthogonal cutting test data from the available literature and found in reasonable agreement.The cutting forces can be predicted only by workpiece material properties and cutting conditions without any additional experimental data of orthogonal cutting in the model proposed.

关 键 词：直角切削 切削力 流动应力 加工仿真 热力模型 

分 类 号：TH161[机械工程—机械制造及自动化] TP391.73[自动化与计算机技术—计算机应用技术]