| 摘要 |
PROBLEM TO BE SOLVED: To provide a press working method by which a member having a shape having a projecting part having satisfactory height is accurately formed from a thin flat plate-shaped metallic base stock. SOLUTION: This method is provided with protruding stages (a)-(c) where the thickness in the outside portion is thinned and also the inside portion is protruded by making the material in the portion where the thickness is thinned thickness flow and projecting part forming stages (c), (d) where the projecting part 23 having a prescribed height is formed by pressurizing the portion where is protruded in the protruding stages by press working. The protruding stages have a plurality of press-working stage for successively reducing the outside diameter in the inward protruded part and successively raising the height of the protruded portion. Furthermore, the method is provided with a drawing stage for forming a cup-shaped member which has a shape having a tube part, a bottom part and a projecting part projected from the inside of the bottom part by drawing the thinned thickness portion in the surrounding of the projecting part formed in the projecting part forming stages. COPYRIGHT: (C)2007,JPO&INPIT
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