2134/36774
Wei Bai
Wei
Bai
Anish Roy
Anish
Roy
Ronglei Sun
Ronglei
Sun
Vadim Silberschmidt
Vadim
Silberschmidt
Enhanced machinability of SiC-reinforced metal-matrix composite with hybrid turning
Loughborough University
2019
Machinability
Particle-reinforced metal-matrix composites
Chip formation
Surface topography
Tool wear
Hybrid machining
Mechanical Engineering not elsewhere classified
Mechanical Engineering
2019-02-05 10:05:38
Journal contribution
https://repository.lboro.ac.uk/articles/journal_contribution/Enhanced_machinability_of_SiC-reinforced_metal-matrix_composite_with_hybrid_turning/9568682
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