微织构刀具切削CFRP的织构参数优化研究

Research on Texture Parameters Optimization of Micro-textured Cutting Tool for Cutting CFRP

碳纤维增强复合材料(Carbon fiber reinforced plastic,CFRP)在加工时易出现切削力及面下损伤深度过大现象,为改善CFRP加工性能,创建了基于二维Hashin准则的宏观连续动态切削CFRP有限元模型,通过引入沟槽形微织构刀具以降低切削力及面下损伤深度。基于响应面法(RSM)建立了29组四因素三水平切削实验,拟合了面下损伤深度关于4个织构参数(织构到切削刃的距离T,织构宽度W,织构间距s和织构深度d)的二次多项回归方程,分析了各因素对面下损伤深度的影响。结果表明:不同参数的微织构刀具切削CFRP产生的切削力及面下损伤深度均小于无织构刀具,各织构参数对面下损伤深度影响程度依次为W,d,s,T,在T=10μm,W=30μm,s=20μm,d=10μm时切削力及面下损伤深度达到最小。

Carbon fiber reinforced plastic(CFRP)is easily subjected to cutting forces and excessive depth of subsurface damage in machining,and in order to improve the machining performance of CFRP,a macro continuous dynamic cutting CFRP finite element model was established based on the Hashin failure criterion.The groove-shaped texture tool was introduced to reduce the cutting force and subsurface damage depth.Based on the response surface methodology(RSM),29 groups of four-factor three-level orthogonal cutting experiments were established,and the four texture parameters(distance T,texture width W,texture spacing s and texture depth d)were fitted to the subsurface damage depth.The influence of the each factor on the depth of subsurface damage is analyzed.The results show that the cutting force and subsurface damage depth generated by the micro-textured tool are smaller than those of the non-textured tool.The influence of the texture parameters on the damage depth is W,d,s,T,and the cutting force and the subsurface damage are minimized when the optimal combination of texture parameters is T=10μm,W=30μm,s=20μm,d=10μm.