Abstract: To solve the problems of SiCp/Al composites processing, such as low efficiency and limited surface quality, a processing method was proposed by combined electrical-arc-milling and milling-grinding. The experimental results show that the obtained material remove rate was up to 6300mm3/min and the thickness of recast layer was below 100μm by the electrical-arc-milling to the rough machining of 50%SiCp/Al composites (volume fraction). On the other hand, when the milling-grinding was applied to the finishing of 50%SiCp/Al composites, the surface defects such as edge breakage can be avoided, and the surface roughness (Ra) was 0.8μm. The validity of the combined manufacture method was proved with the machining tests for the bracket IR seeker, which was made of 50%SiCp/Al composites.

Key words: SiCp/Al composites, electrical-arc-milling, mill-grinding, combined machining