Effect of plane rake faced twist drills with different drill geometric angle on CFRP

doi:10.19936/j.cnki.2096-8000.20211028.011

Abstract

Abstract: The delamination produced during CFRP drilling will affect its structural strength seriously. Delamination is closely related to the thrust force during drilling hole, which is closely related to the tool, so it is particularly important to choose the tools with appropriate geometric structure. In this paper, the research objects of drill geometry included the helix angle, point angle and clearance angle of plane rake faced twist drills, which was used to investigate the influence law of different geometric angles on the thrust force and drilling quality. What's more, the influence degree of different geometric angles on the delamination of drilling hole at entrance and exit was also analyzed. The results show that optimum geometry of plane rake faced twist drills for drilling CFRP is the helix angle of about 35°, the point angle of about 120° and the clearance angle of about 12°.

Key words: CFRP, plane rake faced twist drill, drill geometry, delamination

CLC Number:

TB332

LIU Li-ping, LIAN Bo, ZHU Xue-ming, ZHOU Chang-geng, XIA Ping-feng. Effect of plane rake faced twist drills with different drill geometric angle on CFRP[J]. COMPOSITES SCIENCE AND ENGINEERING, 2021, 0(10): 74-82.

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