摘要
采用有限元方法构建了42CrMo(美国牌号AISI 4140)合金钢的正交切削仿真模型,并对其进行了二维有限元仿真.切削仿真中,利用Johnson-Cook本构模型确立工件材料模型,刀屑界面摩擦采用剪切摩擦,分析温度场时把热传导系数设置为在刀屑界面上产生的压力函数.切削仿真结果表明:增大刀具前角,切削力下降;提高切削速度,则切削温度上升,等效应变速率明显加快.
The structural alloy steel 42CrMo（AISI 4140）is simulated using orthogonal cutting model by two dimensional finite element methods.In the process of the simulations,the workpiece material modeling in machining is established by the Johnson-Cook constitutive model,the friction at the interface of the chips and the rake face of the tools applied using shear frictions,and the thermal conductivity coefficients are suggested as the functions of normal stresses at the interface when analyzing temperature fields.From the cutting simulations,the results show that cutting forces are decreased with increasing rake angles,and cutting temperatures increased and effective strain rates enhanced obviously with increasing cutting speeds.The simulation results mentioned above will provide a valuable reference and guidance for researching on the machining mechanism and the cutting process of structural alloy steels.
出处
《延边大学学报（自然科学版）》
CAS
2015年第2期170-174,共5页
Journal of Yanbian University（Natural Science Edition）
关键词
等效应力
等效应变
切削力
切削温度
effective stress
effective strain
cutting force
cutting temperature
