斜角切削的热力建模与仿真分析  

Thermomechanical Modeling and Simulation Analysis of Oblique 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,武汉430074

出　　处：《中国机械工程》2010年第20期2402-2408,共7页China Mechanical Engineering

基　　金：国家重点基础研究发展计划(973计划)资助项目(2009CB724306)

摘　　要：提出了斜角切削热力模型。用等效平面方法把不等分剪切区的直角切削理论延伸并应用于斜角切削中,等效平面的方位由定义的等效平面角来确定。使用坐标变换法分析了斜角切削几何参数之间的关系。建立了剪切区剪切速度、剪应变、剪应力和温度分布的控制方程,在考虑了工件材料加工硬化和热软化影响的条件下,由材料的Johnson-Cook本构方程预测出了剪切区的流动应力。计算了一定加工条件下的切削力,计算结果与已有文献斜角切削实验数据具有较好的一致性,同时,试验表明所提出的斜角切削模型适合于立铣切削力的预测。A thermomechanical model for oblique cutting was proposed. Using equivalent plane approach, orthogonal cutting theory based on unequal division shear zone was extended and applied to oblique cutting. The orientation of the equivalent plane was determined by the equivalent plane angle. The geometrical parameters associated to oblique cutting were analyzed using the coordinate transformation approach. The governing equation of the shear velocity, shear strain, shear stress and temperature distribution in the shear zone were established. The flow stress was predicted from Johnson-cook material constitutive equation which considered the effects of strain hardening and thermal softening. At last, the cutting forces were calculated for different machining conditions, predicted results are in good accordance with oblique cutting test data from the available literature and found. The proposed model can be used to predict cutting force of end milling by the experimental validation.

关 键 词：斜角切削 切削力 流动应力 热力模型 

分 类 号：TG501.3[金属学及工艺—金属切削加工及机床]