The double cone drill and twist drill were used to drill T700 carbon fiber reinforced plastics (CFRP). The drilling axial force, hole exit quality and surface roughness were used to analysis the double cone drill hole making features under different processing parameters. Compared with carbide twist drill, the double cone drill performed excellent cutting performance because of its drilling axial force reduced by about 20%, the hole exit quality is better, and the hole surface roughness is smaller. So, the double cone drill is more suitable for drilling CFRP. |