【摘要】 针对三明治结构淬硬钢切削过程复杂、切削力难以预测的问题,借助ABAQUS有限元软件,基于物理失效切屑分离准则、Johnson-Cook本构模型,建立了三明治结构淬硬钢Cr12Mo V的铣削数值分析模型。对三明治结构淬硬钢的铣削加工过程进行了数值模拟,通过改变仿真过程中的切削加工参数,获得了三明治结构淬硬钢的切削温度、切削力的分布;分析了工件硬度变化对切削温度、切削力大小的影响;通过铣削实验,对仿真结果进行了验证。研究结果表明:切削时的温度随工件硬度增大而不断升高,且同等切削参数下三明治结构切削温度较相应硬度区切削温度有所增加;三明治结构仅对焊缝夹层位置的切削力产生影响,并未对其他位置的切削力产生作用;实验结果与仿真结果基本吻合,验证了仿真模型的正确性。更多还原

【Abstract】 Aiming at the problem that it is difficult to predict the complexity and cutting force of sandwich structure hardening steel,a numerical analysis model of Cr12 Mo V sandwich structure hardening steel was established by using ABAQUS,this model was based on physical failure chip separation criteria and Johnson-Cook constitution model. The cutting processes of sandwich structure hardening steel were numerically simulated by the numerical analysis model,acquiring the distributions of cutting forces and temperatureby changing the parameters of the simulation in the process of machining. The effects of hardness on cutting temperature and cutting force were analyzed. The simulation results was verified by milling experiment. The results indicate that the cutting temperature become higher when the hardness of part become harder and the temperature with sandwich structure is higher than the temperature of part with corresponding hardness in the same cutting condition.The cutting force of the weld interlayer position is only influenced. The experimental results agree with the simulation results,so as to the validity of the simulation model verified.更多还原