The Behaviour of CFRP Material in Micro Drilling Process Towards Thrust Force

This research was focusing on a micro drilling process performance towards thrust force and tool wear. Rapid tool wear in the micromachining industry contributed to the negative impact on process cycletime and manufacturing cost. The tool used was micro drill bit HSS Carbide with diameter 0.9 mm. Carbon Fiber Reinforced Polymer (CFRP) was the material selected for the workpiece of this experiment. The purpose of the study is to select the optimum parameter of micro drilling process towards minimum thrust force as well as the tool wear. This research had been conducted with data collection on the range of the selected cutting parameter. The significant parameter had been defined by Analysis of variance (ANOVA). Taguchi L27 Method was used for screening and eliminating the parameter that was not significant and there was found that the combination of the lowest feed rate of 0.001 mm/rev with the spindle speed of 8,000 –12,000 rpm produced higher thrust force. Thus, this feed rate was eliminated for the optimization stage. Finally, 2-Level Factorial Method has been applied to optimize the parameter of the experiment. It was found that the lowest thrust force was contribute by the combination of spindle speed 8,000 rpm and feed rate 0.01 mm/rev. As a result, it showed that value of feed rate had significant effect on thrust force during micro drilling process