| 摘要 |
PROBLEM TO BE SOLVED: To easily form a pointed tip shape on a tip part of a stock at a low cost. SOLUTION: When forming the pointed shape by drawing the tip part of the stock 6, a die 1 used for this drawing comprises a screw die part 2, a drawing die part 3, and a relief part 4, and knurling dies 5 the drawing die part 3 comprising a first-stage drawing part 3A, a second-stage drawing part 3B and a third-stage drawing part 3C is used to perform the multiple-stage drawing.
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