期刊名称：International Journal of Innovative Research in Science, Engineering and Technology
印刷版ISSN：2347-6710
电子版ISSN：2319-8753
出版年度：2013
卷号：2
期号：7
页码：2801
出版社：S&S Publications
摘要：Nonlaminated composites having superior mechanical properties than laminated composites is widely usedin ballistic applications. Since literature on the machinability of nonlaminated composites is scarce, an investigationwas carried out to study the hole quality in drilling thick nonlaminated Glass Fiber Reinforced Plastic (GFRP)composite rods using coated tungsten carbide twist drill. The GFRP composite rods were made by pultrusion methodwith high fiber weight fraction. The ovality (hole diameter inaccuracy) of the drilled holes was measured usingCoordinate Measuring Machine (CMM). Taguchi‟s orthogonal array and analysis of variance (ANOVA) wereemployed to study the influence of process parameters such as feed and spindle speed on ovality of the drilled holes.The optimum level of process parameters towards minimum ovality was obtained to achieve defect controlled drillingof pultruded GFRP composite rods. Correlation for ovality with process parameters was established using a statisticalsoftware MINITAB 16. The influence of speed on ovality was insignificant. The influence of feed was significant onovality of the drilled holes. The optimal process parameter levels within the range examined was identified as 0.15mm/rev feed and 1000 rpm speed for pultruded GFRP composite rods using 10 mm diameter twist drill. The influenceof process parameters on hole quality in nonlaminated composite rods differs with drill geometry and also differs fromthe influence of process parameters on hole quality in laminated composites.
