Abstract
In recent years, the reinforced plastics (GFRP, CFRP and others) are used in a wide field of manufacturing industry. With an increase of the demand for such composite materials, the need to drill these products is increasing rapidly. This paper deals with drilling of GFRP and CFRP, using high speed steel (SKH9) and cemented carbode (KOl. PlO and ultra-fine grain) drills. Comparison of four drills is done by investigating tool wear pattern, flank wear width and cutting forces. A new type of tool wear which should be referred to as "combing wear" was found in drilling of CFRP. In addition, it was found that KOl has the highest wear resistance, FG shows the second highest and the wear of high speed steel drill is remarkably larger than that of carbide drills.
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