基于切削速度调控的 CFRP/Ti 叠层切削加工界面缺陷抑制工艺研究

While CFRP/Ti stacks is a high performance composite material widely used in aerospace, the deformation behavior of their constituent phases significantly impacts its drilling quality. The intrinsically different deformation behavior between CFRP and Ti6Al4V results into interfacial defects formation in cutting of CFRP/Ti stacks. And how to minimize the interfacial surface step is critical for improving the machinability of CFRP/Ti stacks. In this work, a novel machining strategy of regulating cutting speed in the CFRP-Ti interface is proposed, which is effective in modulating the formation propensity of interfacial defects and promoting the machinability of CFRP/Ti stacks. Firstly, three-dimensional micromechanical finite element modeling and simulations of CFRP/Ti stacks cutting are carried out. Subsequently, finite element simulations and experiments are conducted to elucidate the formation mechanisms of interfacial defects at the CFRP-Ti interface. Furthermore, the profile of interfacial surface in CFRP/Ti stacks cutting, as well as its dependence on cutting sequence between the two constituent phases and cutting speed, are investigated. Finally, varying cutting speed-based strategy is applied to suppress the failure behaviors of matrix and fiber, as well as the transition characteristics of stress in adjacent CFRP and Ti6Al4V, which are effective in controlling the failure behaviors of resin matrix and carbon fibers, thus effectively suppressing the defects in CFRP-Ti interface.