Analysis on Machinability of Aluminium Metal  Matrix Composites Reinforced With B4c And  Graphite Particles Under Specified Machining  Conditions � A Critical Study on the Effect Of  Surface Roughness And Swarf Formation

S.Prabagaran; Dr.G.Chandramohan; Dr.S.R.Devadasan

Volume : III, Issue : IV, April - 2014

Analysis on Machinability of Aluminium Metal Matrix Composites Reinforced With B4c And Graphite Particles Under Specified Machining Conditions � A Critical Study on the Effect Of Surface Roughness And Swarf Formation

S. Prabagaran, Dr. G. Chandramohan, Dr. S. R. Devadasan

Abstract :

Aim of this work is to do a viable machinability study by experimental investigations on surface roughness and swarf formation in turning of AA6061 aluminium alloy (100%), AA6061-B4C ( 90% and 10%) and AA6061-B4C-Gr (87%-10% and 3%) hyid composites. Experiments were conducted with different cutting conditions using Carbide , CBN (Cubic Boron Nitride) and PCD (Poly Crystalline Diamond) tools. Surface roughness are more for carbide tools in comparison with PCD tools which are minimum. PCD tools perform better than CBN and carbide tools. This is due to the daubing effect and dismissal of softer and amorphous Graphite particles on the surface of the composite specimen, which produces pits on the machined and hence reduces the surface finish level. On the other hand graphite particulated composite produces discontinuous chips that led to the smooth machining. PCD tools are better than carbide and coated carbide tools in the reduction of surface roughness. Machining parameters like cutting speed, feed rate and spindle speed and cutting tool also influencing the surface finish level. Influence of these parameters in turning of AA6061 aluminium alloy, AA6061-B4C and AA6061-B4C-Gr hyid composites are discussed with the experiment results here.