碳纤维复合材料螺旋铣孔细观切削力分析

Analysis of Micro Cutting Forces in the Helical Milling of CFRP

为了准确预测碳纤维增强复合材料(carbon fiber reinforced polymers,CFRP)螺旋铣孔过程中切削力的变化,在切削力模型中着重考虑CFRP材料的各向异性和纤维方向角的影响,根据不同损伤区域对CFRP细观单元体进行直角切削分析.在此基础上结合螺旋铣孔加工原理,考虑侧刃及底刃的作用,分析不同纤维方向角下切削力的变化情况,建立螺旋铣孔切削力理论模型.开展CFRP螺旋铣孔实验,以测量的三向切削力的周期波动值作为分析依据,求解特定公转角度下的切削力理论值.结果表明切削力理论值与实验值拟合误差不超过16%,验证了CFRP螺旋铣孔切削力理论模型的正确性.

In order to accurately predict the variation of cutting forces in the helical milling of CFRP,the effects of anisotropy of CFRP materials and fiber direction angle are emphatically considered in the modeling of cutting forces.The orthogonal cutting analysis of CFRP mesoscopic units is carried out according to different damage areas.On this basis,combining the machining principle of the helical milling and considering the cutting force generated by the periphery edges and bottom edges respectively,the change of cutting forces under different fiber direction angles is analyzed,and the theoretical model of cutting forces for helical milling is established.Through the helical milling experiment of CFRP,based on the measured periodic fluctuation values of the three￣way cutting forces,the theoretical values of the cutting forces under the specific revolution angles are solved.The results show that the fitting error between the theoretical and experimental values of cutting forces is less than 16%,which verifies the correctness of the theoretical model of cutting forces in the helical milling of CFRP.