Enhanced machinability of SiC-reinforced metal-matrix composite with hybrid turning
journal contributionposted on 05.02.2019 by Wei Bai, Anish Roy, Ronglei Sun, Vadim Silberschmidt
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Particle-reinforced metal-matrix composites are promising engineering materials thanks to their superior mechanical and thermal properties. However, their poor machinability is a deterrent for use in wider applications, due to the presence of hard ceramic particles, which results in rapid tool wear during machining. Ultrasonically assisted turning (UAT) is a hybrid machining technique, in which the cutting tool is made to vibrate at high frequencies and low amplitudes. In this study, the machinability and tool wear of machining SiCp/Al metal matrix-composite was compared for dry UAT and conventional turning with the use of a cemented carbide (WC) and a polycrystalline diamond (PCD) tool. With the use of ultrasonic assistance, a significant reduction in cutting forces was achieved with a slight increase in cutting temperature. Continuous and semi-continuous chips were obtained in UAT, with better surface topography. A chip-formation mechanism in UAT show increased ductility of the workpiece material when subjected to a repeated high-frequency microchipping process. Abrasive and adhesive wear occurred on the WC tool in both conventional turning and UAT. However, the machined surface obtained in UAT with a WC tool was comparable and sometimes even better than that achieved with the PCD tool
This work was supported by the National Basic Research Program of China (973 Program) grant No. 2013CB035805. The authors gratefully acknowledge financial support by the China Scholarship Council. Funding from the Engineering and Physical Sciences Research Council (UK) through grant EP/P027555/1 is gratefully acknowledged.
- Mechanical, Electrical and Manufacturing Engineering