作者: Keiichiro Nakao , Naoki Takahashi , Kazuki Miyamoto
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摘要: Provided are a press forming method capable of improving material yield while avoiding the risk dimensional error increase at product sections in blank when carrying out forming, and plate expansion device used this method. (A) An end side (1) for is restricted by holding rollers (210a, 210b, 210c, 210d), pressure applied to middle location part that roller (210p). (B) In state, transported rotating direction being driven continuously bend extend section receiving pressure. (C) This bent extended flattened with flattening obtain wherein an (WE) expanded.