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Blind Hole Machining of Quartz Fiber Reinforced Ceramic Matrix Composites by Helical Milling with Electroplated Diamond Tool

Quartz fiber reinforced ceramic matrix composites have poor thermal conductivity yet high fiber hardness that make them difficult for machining. Especially for drilling of blind hole, the cutting heat can not be conducted away from the semi-enclosed hole quickly, which may result in serious tool abrasion and poor machined quality. Experimental research on helical milling process was carried out, specifically on the machining of Φ8mm blind hole. Exploiting grinding mechanism, self-developed electroplated diamond trepanning tool was used. The experimental results show that the helical milling method exhibit advantages e.g. reducing cutting force, improving cutting heat dissipation and achieving good hole quality.