Improvement on the Cutting Performance of CVD Diamond Coated Drills in Drilling CFRP

Abstract:

Carbon fiber reinforced plastics (CFRP) is difficult to machine because of the extremely abrasive nature of the carbon fibers and its low thermal conductivity. CVD diamond films have many excellent properties such as wonderful wear resistance, high thermal conductivity and low friction coefficient, therefore depositing diamond films on the surface of drills is thought to be an effective way to elongate the lifetime of drills and improve the cutting performance. In this study, diamond films are deposited on the WC-Co drill using hot filament chemical vapor deposition (HFCVD) method. The results of characterization by the scanning electron microscope (SEM) and Raman spectrum indicate that the fabricated CVD diamond coated drill is covered with a layer of uniform and high-purity diamond films. The cutting performance of as-fabricated CVD diamond coated drill is evaluated in dry drilling CFRP, comparing with the uncoated WC-Co drill. The results demonstrate that the CVD diamond coated drill exhibits much stronger wear resistance. Its flank wear is about 50μm after drilling 30 holes, about one-third of that of WC-Co drill. Machining quality of the exit and internal wall of drilled holes shows better surface finish obtained by coated drill, which suggests that CVD diamond coated tool has great advantages in drilling CFRP.

• Periodical: Key Engineering Materials (Volume 499)
• Pages: 366-371
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.499.366
• Online since: January 2012
• Authors: Jian Guo Zhang, Ben Wang, Fang Hong Sun, Hang Gao
• Keywords: Carbon Fiber Reinforced Polymer/Plastic (CFRP), Cutting Performance, CVD Diamond Coated Drill, HFCVD, Tool Wear

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