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Machinability of Lm6/Gr Particulate Metal Matrix Composites with Cubic Boron Carbide Cutting Tool Inserts

By Arun B. Kumar and P. A. Abdul Samad


Abstract — During a recent period of time, the utilization of metal matrix composite materials has increased tremendously in many engineering fields. Accordingly the need for accurate machining of composites has also increased enormously. Despite the recent developments in the near net shape manufacture, composite parts often require post-mould machining to meet dimensional tolerances, surface quality and other functional requirements. In the present work, stir casting of LM6- Gr has been done and the cutting forces of LM6-Gr composite has been studied by turning the composite bars using cubic boron carbide (CBN) inserts under different cutting conditions. The effects of the selected process parameters like speed, depth of cut, percentage composition are determined by Taguchi’s parameter design approach. The experimental data collected are tested using optimization techniques and the optimum value of cutting forces is identified. Confirmation test is also conducted to validate the test results and to predict the machinability of the composite under the cutting conditions within the operating range. Keywords—Particulate Metal matrix composites, Stir casting, LM6 alloy, Gr powder, machinability

Year: 2014
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