The Effect of Workpiece Temperature on the Machinability of an Aluminum/SiC MMC

[+] Author and Article Information
S. Barnes, I. R. Pashby, D. K. Mok

Warwick Manufacturing Group, University of Warwick, Coventry, England

J. Manuf. Sci. Eng 118(3), 422-427 (Aug 01, 1996) (6 pages) doi:10.1115/1.2831047 History: Received November 01, 1994; Revised June 01, 1995; Online January 17, 2008


Metal matrix composites (MMCs) are becoming an increasingly important class of engineering material which are finding applications both in the automotive and aerospace industries. However, their machinability is regarded as poor due to the severe abrasive tool wear observed during machining. Prior to an investigation into the laser-assisted turning of an aluminium/silicon carbide MMC, the machining behaviour of the material after pre-heating to 200, 300, and 400°C was investigated. The results indicated that at cutting speeds from 20–90 m/min the wear rate increased with increasing workpiece temperature although the wear mechanism remained one of abrasion. The presence of a built-up edge (BUE) was noted and a strong correlation found between its presence and the amount of wear produced. The results of this work show that within the range of parameters investigated, the pre-heating of the MMC had a detrimental effect on its machinability.

Copyright © 1996 by The American Society of Mechanical Engineers
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