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이상현(S. H. Lee),김경섭(K. S. Kim),주용규(Y. K. Ju),김종호(J. H. Kim) 한국소성가공학회 2015 금형가공 심포지엄 Vol.2015 No.8
Restriking is a kind of sizing process which is an additional operation for increasing the accuracy of the shape or dimension of a cup formed from the previous step. In this paper, Restriking is limited to make a corner sharp of a cup in the last step. A new stepped punch is designed for this experiment. Experiments were carried out to investigate which condition prevented the occurrence of concave defect on the bottom of cylindrical cups as well as which condition gave the minimum corner radius of a cylindrical cup in the restriking process.