Abstract
Generally, the compacting speed of a industrial oil hydraulic press in powder metallurgy lies from 5 to 150 mm/sec.
This report presents the relations between the compacting speed and the green density of compacts made from mill-scale reduced iron powder, as compacted in a single direction under the several maximum compacting pressures of 3.6, 4.6 and 5.6 t/cm2.
Results obtained are as follows :
1) The compacting speed has a close relation to the green density. The green density increased almost linearly with increasing compacting speed. This might be explained as due to the decrease in friction force between the green compact and the die-wall, which resulted from the increase of the compacting speed.
2) The above tendency is associated with the maximum compacting pressure also the effect of compacting pressure is more remarkable for lower compacting pressure. The green density is not influenced by the compacting speed at higher compacting pressure, say, 5.6 ton/cm2.
