Experimental investigations on high speed drilling of unidirectional GFRP composites

In the recent era researchers have focused on environmental and sustainable aspects of the manufacturing of composites (green composites). Glass fibre reinforced polymer (GFRP) composites are widely utilized in several sectors because of their excellent strength-to-weight ratio, corrosion resistance, and lightweight nature. Drilling is an essential machining operation, but using traditional drilling in composites techniques can result in problems such fibre pullout, delamination at entry and exit, and uneven surface smoothness. A potential technique to minimize these problems is high-speed drilling, which offers better hole quality and higher production. An investigation of thrust force (TF), torque, delamination at entry (DFentry) and exit (DFentry) in the high-speed drilling (HSD) of unidirectional GFRP composites is presented. Recycled unidirectional glass was used to fabricate GFRP composites. HSD performance were measured for thrust force, torque, delamination at entry and exit were studied experimentally about cutting speed (200, 250, 300 m/min), feed rate (100, 200, 300 mm/min), and point angle(106 degrees,118 degrees,130 degrees). For analyzing the experiment data using analysis of variance (ANOVA), the most contributing drilling input process variables were PA-47.36%, PA-79.46%, PA-69.84% and FR-71.75% for the responses TF, torque, DFentry and DFexit of minimum damages to improve the drilling process' effectiveness and calibre. The results of this study contribute to the development of high-speed machining methods for composite materials by offering manufacturers useful information on how to optimize drilling operations in the manufacturing of GFRP composites, regression analysis for empirical models and gray relational analysis performed to optimize the responses.