Abstract
The delamination produced during drilling CFRP will affect its structural strength seriously. Delamination is closely related to the thrust force during drilling, which is closely related to the tool, so it is particularly important to choose the tools with appropriate geometric structure. Many scholars used tools with different geometric structure to drill CFRP, and then conducted the drilling damage analyses and drilling mechanism researches. It finally came to a conclusion that a drill with a special structure had certain advantages compared with a common twist drill in the drilling process. A new type of plane rake–faced twist drill was used to drill the CFRP laminate with a thin-woven glass fiber surface layer. Experimental results showed that the plane rake–faced twist drill along cutting edge had a constant reference rake angle value, which caused the plane rake–faced twist drill generated smaller thrust force and less drilling damage than the common twist drill. As the reference rake angle of the plane rake–faced twist drill increased, the thrust force and drilling damage decreased. It was revealed the inhibition of the thin-woven glass fiber surface layer on the drilling damage at entrance and exit. Finally, it was proposed that when the plane rake–faced twist drill was used to drill CFRP laminate with a thin-woven glass fiber surface, 46° reference rake angle should be selected.
Highlights
Carbon fiber reinforced polymer(CFRP) composite is an excellent structural composite material which composed of high-strength carbon fiber and flexible matrix material
The characteristic of low drilling damage with plane rake faced twist drill compared with the common twist drill was studied
The thrust force decreased with the increase of reference rake angles, but when the reference rake angles increased from 46° to 50°, the decreasing amplitude of thrust force was only 1%
Summary
Carbon fiber reinforced polymer(CFRP) composite is an excellent structural composite material which composed of high-strength carbon fiber and flexible matrix material. Carbon fiber composite materials have high strength-to-weight ratio and stiffness constitute, While carbon fiber reinforced polymer composite has various advantages, the cutting mechanism is quite different from traditional material cutting mechanism due to its anisotropy and high wear resistance. The manufacturing processing of carbon fiber reinforced polymer composite has become the main reason for its limited application [4]. For traditional drilling carbon fiber reinforced polymer composite, there is damage such as interlayer delamination and uncut fibers, matrix melting, fiber cracks and so on, which make it difficult to analyze its drilling performance [5]. In the composite material manufacturing industry, traditional drilling is the main method for making composite material holes. The quality of assembly mechanical joints such as bolted connections, rivet connections and pin connections are highly dependent on the quality of drilling [6]
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