| 摘要 |
PROBLEM TO BE SOLVED: To perform molding of a highly accurate convex part at the time of work punch molding for molding a convex part and a concave part corresponding each other on both sides of the work by restricting concentration of an excess metal to a base end peripheral part of the convex part. SOLUTION: When a metallic plate material X is mounted on a die 4 and is clamped, a tensile stress is given to the plate material X in a state that a counter punch 5 is pushing up from downward of the plate X. Next, while a concave part W2 is press molded to the plate X, to which a tensile stress is given, by a mold convex part 9 (8) of the molding punch 7, a convex part W1 is press molded by a mold concave part 10 of the counter punch 5. Then, a punching position of the plate X, on which the concave part w2 and the convex partΩ1 are molded, is pushed down by the molding punch 7 for punch molding the work W.
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