采用PCBN刀具对镍基高温合金GH4169进行了高速切削试验,通过正交试验分析了切削速度、切削深度、进给量对切削力的影响规律,在试验基础上利用多元线性回归分析基于最小二乘法建立了切削力的预测模型;基于Deform-3D软件建立了高速切削的有限元模型,对切削过程进行有限元模拟,得到了切削力、切削温度和应力场的分布;以切削力为指标对有限元模型进行了验证.结果表明:切削力随切削速度的增大而先增大后减小,随切削深度、进给量的增加而增大;回归分析显著性检验结果证明所建立的模型能对切削力进行有效预测,三向切削力模拟的综合平均偏差小于15%,验证了有限元模型的正确性和有效性.

Experiment of high speed cutting nickel-based superalloy GH4169 with PCBN(polycrystalline cubic boron nitride) tool was carried out.The effects of cutting parameters(cutting speed,cutting depth and feed rate) on cutting forces were studied by using orthogonal test.Prediction models of cutting forces were established by multiple regression analysis with least squares estimation.At the same time,finite element simulation model of high speed cutting was established based Deform-3D to simulate the cutting process,the distributions of cutting force,cutting temperature and stress field were studied.It is shown that the cutting forces increased and then decreased with the increase of cutting speed,and increased with the increase of cutting depth and feed rate.Regression analysis significance test results proved that the model could effectively predict the cutting forces.Comprehensive mean deviation of simulated cutting forces was less than 15%,this demonstrated the validity and efficiency of the model.