Experimental study on the quality of drilled holes in Sabai grass reinforced composites

Abstract

Hole quality in composites plays very important role in the production of close tolerance holes in automobile parts. Through drilling experiments in Sabai Yarn reinforced composite, this study examines the impact of different input parameters like feed rate, rpm, and tool diameter. The circularity of hole was measured with the help of CMM. The circularity error was reported in the range of 0.037 to 0.1628 mm. Design of experiments and Taguchi method have been used to study the effect of process parameters. The circularity of hole mainly depends on feed rate and rpm in the drilling process of Sabai yarn composite. The circularity error and delamination are minimum in treated reinforcement in yarn (0°) and woven yarn (0°/90°) compared to the untreated reinforcement yarn (0°) and woven yarn (0°/90°). Due to strong bound strength fibres cannot pull-out its cut with tool edge so that it gives smooth machined surface in treated reinforcement. The chip formation in drilling depends on the feed rate and tool diameter. Chips are discontinuous at the higher feed rate and higher rpm.