| 摘要 |
PURPOSE:To make mass production of the same dies with a relatively simple method by dividing the product part space of a plunger die to two layers by a partition plate, packing different metallic powders into the respective layers and subjecting the powders to compression molding then to annealing. CONSTITUTION:The expendable partition plate 5 consisting of paper, etc., is cylindrically set into the product part space R of the plunger die 1 consisting of a die 2 and a lower punch 3 to delineate an inside space R1 and an outside space R2. The respectively different metallic powders P1, P2 are packed into the spaces R1, R2 and these metallic powders P1, P2 are adequately selected according to need. The metallic powders P1, P2 including the partition plate 5 are then subjected to compression molding by an upper punch 4 and a lower punch 3 to a die shape to form a semi-finished molding S. The semi-finished molding S is put into a pressure resistant vessel 6 of a CIP treatment device and is subjected to a cold hydrostatic pressurization treatment to increase the density of the green compact and thereafter the green compact is put into a sintering furnace 7 and is subjected to a heat treatment to expend the partition plate 5, by which the die D is formed. The easy mass production of the same dies D is thus made possible.
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