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<p>In this study, the drilling of a hybrid composite comprised of glass and aramid fiber was investigated. The selection was made to provide insight into the relevant consequences of both materials under the same drilling settings and atmosphere. Laminates with a thickness of 6&#xa0;mm were produced using vacuum-assisted resin molding (VARTM). Drilling tests were conducted utilizing CNC milling machines and three distinct geometries of carbide drill bits: standard, helical, and parabolic. A total of 16 experiments using four spindle speeds and four feed rates across three drill geometries were performed to systematically analyze thrust force and burr formation. The study showed that as the speed of the spindle increases, the thrust force value is low, and the formation of the burr also decreases. The parabolic bit reported the lowest thrust force as 106.91&#xa0;N at 2500&#xa0;rpm and 125&#xa0;mm/min, confirming its exceptional performance in all parameters. The lowest burr formation, measuring 0.264&#xa0;mm in height and 0.111&#xa0;mm in thickness, was likewise found at 2500&#xa0;rpm. In addition, the tool wear of 0.36&#xa0;mm after 200 holes, which was observed to be less than the wear of 0.54&#xa0;mm of the normal bit after 200 holes. The parabolic drill exhibited a 21.6% reduction in thrust force and a 31% reduction in burr height compared to the standard bit. The industrial applicability to aerospace and automotive sectors has also been explicitly stated.</p>

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Drilling Glass–Aramid Hybrid Composites: Effect of Drill Geometry and Cutting Parameters on Thrust Force, Burr Formation, and Tool Wear

  • 期刊论文

  • 发表日期：

    2025年12月23日

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  • Narender Singh,
  • Rajesh Kumar Saluja,
  • Neeraj Kumar Gahlot,
  • Pankaj Kumar Singh

摘要

In this study, the drilling of a hybrid composite comprised of glass and aramid fiber was investigated. The selection was made to provide insight into the relevant consequences of both materials under the same drilling settings and atmosphere. Laminates with a thickness of 6 mm were produced using vacuum-assisted resin molding (VARTM). Drilling tests were conducted utilizing CNC milling machines and three distinct geometries of carbide drill bits: standard, helical, and parabolic. A total of 16 experiments using four spindle speeds and four feed rates across three drill geometries were performed to systematically analyze thrust force and burr formation. The study showed that as the speed of the spindle increases, the thrust force value is low, and the formation of the burr also decreases. The parabolic bit reported the lowest thrust force as 106.91 N at 2500 rpm and 125 mm/min, confirming its exceptional performance in all parameters. The lowest burr formation, measuring 0.264 mm in height and 0.111 mm in thickness, was likewise found at 2500 rpm. In addition, the tool wear of 0.36 mm after 200 holes, which was observed to be less than the wear of 0.54 mm of the normal bit after 200 holes. The parabolic drill exhibited a 21.6% reduction in thrust force and a 31% reduction in burr height compared to the standard bit. The industrial applicability to aerospace and automotive sectors has also been explicitly stated.