Performance Analysis of Laser Treated and Cryogenic Treated Solid Carbide Microdrill for Machining CFRP

Selvarasu  Sakthi; Anbazhagan Arunkumar; Sundaram  Sabanayagam; Mathiazhagan  Vivekananthan

doi:10.3989/revmetalm.e299.1773

Authors

Selvarasu Sakthi Department of Mechanical Engineering, Arifa Institute of Technology https://orcid.org/0000-0001-6855-9853
Anbazhagan Arunkumar Department of Mechanical Engineering, E. G. S Pillay Engineering College https://orcid.org/0000-0003-4060-0337
Sundaram Sabanayagam Department of Mechanical Engineering, Kings College of Engineering https://orcid.org/0000-0001-7414-3977
Mathiazhagan Vivekananthan Department of Mechanical Engineering, Kings College of Engineering https://orcid.org/0000-0002-0599-4919

DOI:

https://doi.org/10.3989/revmetalm.e299.1773

Keywords:

CFRP, microhole, solid carbide, Force, Delamination

Abstract

The use of carbon-fiber-reinforced polymers (CFRPs) is common in high-performance engineering because it has a high strength-to-weight ratio and mechanical characteristics. Nevertheless, micro-holes of CFRP laminates are difficult to obtain in high-quality because of the destruction created by drilling, especially delamination. In this research, micro-drilling tests were performed on CFRP laminates in a vertical machining center, taking into account the spindle speed, feed rate and drill treatment conditions. The performance of drilling was assessed in terms of thrust force and entry delamination factor. An experimental design was conducted with the help of a Taguchi L9 orthogonal array, and signal-to-noise (S/N) ratio and Analysis of variance (ANOVA) were used to analyze the results. The analysis indicated that the most influential factor is the drill condition, which contributed about 66% to the variation, then the spindle speed, and the feed rate had little influence. The cryogenically treated drill greatly enhanced performance, minimizing the thrust force to at least 1.6 N and delamination factor to 0.32 in experimental conditions. The optimum drilling parameters were confirmed thus it indicated that the responses predicted were in good agreement with confirmation results. The results indicate that statistical optimization of the tool surface modification is extremely useful in reducing the damaging effects of drilling, which offers viable advice on the high-precision production of micro-holes in CFRP.

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