Title: A Study of Cutting Edge Geometry Change and Surface Roughness in Drilling of Carbon Fiber Reinforced Plastics (CFRP) Using Uncoated and Coated Tools

Authors: Mohammad Sayem Bin Abdullah, Dinh Nguyen and Dave Kim

DOI: 10.33599/nasampe/s.20.0218

Abstract: Cutting edge geometry is a great research concern in machining. This paper investigates the effects of tool wear on cutting edge geometry change, consequent effect of cutting edge geometry on inner hole surface roughness in drilling of CFRP. A drilling experiment has been conducted on CFRP using one uncoated carbide drill bit and two coated carbide tools, namely BAM (BAlMg4) and (AlCrSi/Ti)N. Sharp, honed, chamfered, chamfered induced honed cutting edge has been found in CFRP drilling in this investigation. The sharp tool edge transforms into honed and chamfered due to tool wear in subsequent drilling. The coatings delay the edge geometry changes. The surface roughness of the holes has been measured across the half hole at three consecutive holes in every 40 holes interval holes up to 120 holes. Upon clustering the cutting edges of the three drill bits, the paper investigates the tool edge geometry relation with surface roughness parameters (Ra, Rq, Rz, Rt, Rp, Rv) for each drill bits. The results show that cutting edge geometry has a strong influence on the surface roughness in the drilling of CFRP. Chamfered edge created the largest roughness, while the roughness decreased when the chamfered edges turn to chamfered and honed.

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Conference: SAMPE 2020 | Virtual Series

Publication Date: 2020/06/01

SKU: TP20-0000000218

Pages: 11

Price: FREE