Comparison of Cutting Forces and Cutting Temperatures of Two Drills in High Speed Drilling Carbon Fiber Composite

T800 carbon fiber reinforced plastic (CFRP) was drilled by diamond coated drill and carbide twist drill at high speed. The drilling axial forces and drilling temperatures produced by the two cutting tools at various rotational speeds and feet rates were studied and compared; and the effects of drilling axial force on the quality of holes were also analyzed. The results show that high rotation speed and low feed rate can improve the processing quality of holes effectively. Compared with carbide twist drill, the diamond coated drill was more suitable for drilling CFRP as its drilling axial force was reduced by 40% and drilling temperatures was at least reduced by 17% under the same processing parameters.