The SiC particle has higher hardness in the Al/SiCp composite

and the tool wear is fast when Al/SiCp composite is machined. Nano-cemented carbide is a novel material

which is superior to common cemented carbide on physical and mechanical properties

such as high hardness

toughness

flexural strength and higher wear resisting property. In this paper the nano cemented carbide tool WC-7Co was prepared

and the cutting experiment was done. And wear mechanism of nano cemented carbide tool and chip removal mechanism were studied. Results shaw

the wear mechanism of nano cemented carbide tool is abrasion wear due to the micro-cutting of SiC particles

and micro-chipping and micro-breakage of cutting edge under the high frequent interrupted impact of the SiC particles. The essence of cutting Al/SiCp is interrupted cutting. The Al/SiCp chip removal mechanism is breakout of the chip. Flank wear value of nano cemented carbide tool is about 30-50% less than common cemented carbide.