Abstract
A lot of PM parts with complex and thin-walled shape have been used in automobile. Therefore, the PM parts were required to have high density and high strength. Both uniform powder filling method and high pressure powder compaction method are essential for fabrication of the PM parts with the high dimensional tolerance and high strength at low cost. At first, in order to improve the flowability of powders in a feed shoe, an aeration powder filling method has been developed by blowing a small amount of gas into the feed shoe. Next, unique warm compaction using die wall lubrication method, which was used water dispersions of lithium stearate, was developed. Net-shaping of commercial PM parts with high strength has been achieved by the application of the above methods.
