抄録
The key to form uniform and high-density green compacts perfectly is based on the raw material powders themselves and the overall powder compacting process. First of all, the blended powders must have enough pressing flowability. In another word, the powders must be well-flown in a complex die cavity when the powder filling is carried out. Therefore some preliminary studies on the raw material powders were worked out and one of the appropriate blended powder for pressing flowability was confirmed. Second, the practical powder compacting process was studied by the new CNC press. This includes powder filling, powder transfer, compressing and ejection process. During the whole compacting process, the compressing motion timing, positioning, compacting pressure, ejection speed and holding force in ejection of the each upper, lower and side punch are carefully monitored. Finally, the proper powder compacting process by the new CNC press, which was enough consistent and accurate, was established after evaluating green compacts in terms of density, density distribution, forming accuracy and so on.
