| 摘要 |
PROBLEM TO BE SOLVED: To increase accuracy of an angle between a longitudinal wall and a flange and increase degree of flatness of the flange when forming a hat type molding. SOLUTION: A final molding 12 with a hat type cross is press-formed of a metallic blank material 10 by the press forming method. The metal die is provided with a top surface 13, left and right side walls 14, taper parts 16 extended from lower ends of the side walls, and flanges 15 extended from lower ends of the taper parts. A first step S1 for forming an intermediate molding 11 with a hat cross section deeper than the final molding 12 is carried out and a second step S2 for obtaining a hat type cross section of the final molding with is carried out by reshaping the taper parts 16 and the flanges 15 of the obtained intermediate molding 11 into flat flanges 17 in sequence by the press forming method. COPYRIGHT: (C)2007,JPO&INPIT
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