부산대학교 도서관

Glass, carbon, and hybrid/glass/carbon-reinforced polymer composites are the most important materials used in defense, aerospace, automobile, and sports industry because of their excellent mechanical properties. End-milling process is the final and important machining process of composites to achieve the desired shape and dimensions. The main concern of this research is to minimize delamination and surface roughness in carbon/glass/epoxy hybrid composites after end milling. The effects of tool material, spindle speed, feed rate, and cut depth on delamination and surface quality were investigated. Taguchi design of experiment method was used to vary the machining parameters. Surface quality was examined by a surface roughness tester, and the delamination of milled surfaces was inspected by non-destructive technique using ultrasonic testing. The surface morphology of milled surfaces was studied by scanning electron microscopy. Results were verified by signal-to-noise ratio and analysis of variance technique. Carbon/glass/epoxy hybrid composite exhibited better surface finish with diamond flute end mill cutter, spindle speed of 1500 rpm, feed rate of 0.15 mm/min, and cut depth of 0.05 mm. After nondestructive testing, minimum delamination in carbon/glass/epoxy hybrid composite was found using diamond flute end mill cutter at a spindle speed of 1500 rpm, feed rate of 0.10 mm/ min, and cut depth of 0.10 mm.