Machining behavior of multiple layer polymer composite bearing with using different drill bits

Abstract The aim of this work is to investigate the drilling behavior of multiple layer orthotropic polyester composite reinforced with woven polyester fiber and PTFE particle. Drilling ability of the synthetic polymer composite bearing material was examined using a drilling system with different drill bits, feed rate, and spindle speed parameters. The investigation was performed by changing the tool and composite interface. Drilling experiments were carried out on two orientations of the composite structure using three types of drill bits. Results show that the tribomechanical behavior of the drilling operation is affected at different levels by tool geometry and coating. This multiscale behavior is related to the intrinsic friction properties of tool design and coating nature that influence the tribologic contact at the interface between the cutting tool edge and composite surface. The ANOVA was used in the evaluation of experiment results. The best results of thrust force, torque, and surface roughness were obtained with HSS Co bit. Drilling of perpendicular direction requires lower thrust force and torque values than the parallel direction to fiber lamination.