Experimental Research on PCD Tool Turning SiCp/Al Composites
PEN Hongmin1 , LIU Xin2 , NI Na1 , CHEN Zhitao2 , LIU Fei1 , YUE Caixu2
(1. Tianjin Institute of Mechanical and Electrical Equipment, Tianjin 300458, China; 2. School of Mechanical and Power Engineering, Harbin University of Science and Technology, Harbin 150080, China)
Abstract：Silicon carbide aluminum matrix composite, which has excellent thermal conductivity, high specific strength and specific stiffness, will be widely applied in the field of aerospace. However, the reinforced phase in this composite results in poor machined surface quality and severe tool wear. Therefore, the influence of SiCp/Al materials with different particle contents (nanometer-level 5% and micron-level 25%) and cutting parameters (cutting speed, cutting depth and feed rate) on tool wear and machined surface quality were analyzed through experiments. The tool wear mechanism was also analyzed. The experimental results showed that PCD tool wear was more serious and the machined surface quality was worse when turning 25% SiCp/Al composite with micron-level particles. With the increases of feed rate and cutting depth, the machined surface roughness increased, and the rake face was seriously worn. With the increase of cutting speed, the surface roughness of the workpiece decreased, and the wear of rake face increased. Under the cutting parameters used in this research, the tool abrasive wear and blade breakage were the main wear mechanisms for PCD inserts, and built-up edge (BUE) will be generated on rake face of the cutting tool. The experimental results provide a theoretical basis for optimizing the turning process of SiCp/Al composite with PCD tools.
2020, 
