SiCp/Al复合材料, 热处理, 高速铣削, 可加工性, PCD刀具

PCD tool was used to investigate the influences of heat treatment on the machinability when high-speed milling of SiC-particle-reinforced aluminum matrix composites at the cutting speed of 1200m/min. The results show that the cutting forces and the cutting temperature of T6 composite are higher than that of no heat treated material. The saw-toothed chip form is more evident for the T6 material. The above facts indicate that the cutting process of T6 materials is more unstable and that the PCD tool suffers from more cutting impact, which induces excessive chipping, peeling, cracks on the cutting tool. Therefore, the tool life when high speed milling the T6 composites will be much lower than that of the no heat treated materials. The results also show that the machining induces defects such as pits, micro cracks, matrix tearing and smearing etc. are much less for the T6 materials, which results in low surface roughness value and shallow hardened layer.