Influence of Thrust Force in Drilling of Glass Fiber Reinforced Polycarbonate (GFR/PC) Thermoplastic Matrix Composites Using Box-behnken Design☆

Abstract The influence of process cutting parameters such as feed rate, drill diameter, type of drill bit and spindle speed on thrust force produced on drilling of Glass Fiber Reinforced Thermoplastic polymer (GFRTP) Composite material is being studied. Thrust force is an important and un-avoidable parameter in hole making operation. Drilling is final and important operation in assembly of components. Drilling of thermoplastic composite materials should have good interlaminer quality and dimensional stability. Drilling is not properly done then it affects the mating of two components, assembly tolerance, reduces the performance and decreases the number of cycle per components. Experiment is conducted with help of Vertical Machining Center (VMC). Input parameter is taken in account of Solid Carbide material Brad and spur drill bit with three different drill diameters like 6, 9 and 12 mm. The experimental result indicate that feed rate and drill diameter is the important factor for the increase in the thrust force and spindle speed is the man factor for change in torque by using Design of Experiments (DOE). The optimization of cutting parameters during drill is carried out using Box-Behnken Design and analysis of variance (ANOVA).