Carbon fiber reinforced plastic drilling defect analysis

CUI Xi-liang， TIAN Biao， WANG Yong-guo
（School of Electrical Engineering and Automation， Shanghai University， Shanghai 200072， China）

Abstract： Aiming at solving the problems of the tear，burr hole，layer in the process of carbon fiber reinforced plastics（CFRP） drilling and applying carbon fiber reinforced plastics better to the machinery manufacturing industry，drilling experiment of carbon fiber reinforced plastics was made. Through experiment， drilling defects of carbon fiber reinforced plastics were analyzed and classified. The impact of the drilling force，the sharpness of the tool，drilling temperature and other factors on drilling were analyzed. The relationship of drilling speed，feed speed and quality of drilling hole was built. DM2500M metallurgical microscope and KEYENCE VHX-1000 3D microscopy system were used in the experiment. The result indicates that arising of drilling defect is regional. Drilling tear and burr hole mainly concentrate on the exit while there is almost no in the entrance. With decreasing feed speed and increasing spindle speed，drilling defects will be dramatically improved. Therefore，it is proper to drill carbon fiber reinforced plastics using PCD bit at middle and higher speed and easier for bit to cut fiber at high speed to gain high-quality drilling hole.
Key words： carbon fiber reinforced plastic（CFRP）；  drilling； defect； cutting parameters； mechining quality