| 摘要 |
PROBLEM TO BE SOLVED: To provide a forming method capable of suppressing a warp of a three-dimensional shape of a member of a hat-shaped section having a bent part in the longitudinal direction of the member used, in particular, for a vehicle body member of a car. SOLUTION: In the forming method of a member of a hat-shaped section having excellent three-dimensional shape freezing property and having a bent part in the longitudinal direction of the member, the member is formed so that the radius r (mm) of a punch shoulder is larger than the radius R (mm) of a shoulder of a product in a first stage forming; and formed so that the radius is equal to the radius R (mm) of the shoulder of the product, in a second stage forming, with the same width in the first stage by using a punch, a die, and a fold-pressing tool. COPYRIGHT: (C)2007,JPO&INPIT
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