成形過程の実験による解析 (粉体の高速圧縮に関する研究-1,2-)

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This paper is concerned with an experimental study on high velocity compaction process of metal powder. As well as in the preceding paper, copper powder is uniformly packed in a die and one end is struck by a rigid body. The results obtained are as follows.<BR>1) A shock wave propagating through the powder is observed by a high speed camera. Namely, particles of the powder show the same behavior as in the case of a theory that any particle moves at the same velocity as the body after a shock front arrives at the particle, and stops when the front comes back to it again.<BR>2) As frictional force of the powder at side plates increases with travels of the front when a length of the powder is infinitely long, deviations from theoretical results become large with time.<BR>3) When the length is short, the theory and experiment agrees well. This may be due to the fact that one dimensional flow is almost realized when transverses of the front increase and that influences of the friction decrease.<BR>4) The powder is uniformly compacted at this high velocity impact for the reason above mentioned.
社団法人粉体粉末冶金協会の論文