Effect of compaction pressure and velocity on the green compacts roughness that manufactured by metal powder technique

In this research, It has been studied the effect of compaction pressure on the final roughness for the top and down surfaces for the green compacts that manufactured by meal powder technique and it has been studied also the effect of piston velocity (compaction velocity) on the final roughness for the same two surfaces. The results present that the curved for the top surface roughness is completely decreasing and as the pressure has increased, the value for roughness has reduced and the mean roughness (Ra) has very close values, where these values have made curve from second degree and opposite relationship. The results were same for the down surfaces but with different variations.