| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and system for forming a workpiece, by which a product provided with a widespread thickened part and a widespread thin thickness part is formed inexpensively and easily. Ž<P>SOLUTION: The method for forming the workpiece has: a first stage (S1) where the thickness in the middle part is reduced by applying drawing by using a nearly semispherical punch in the middle part of the planar workpiece of a fixed plate thickness; a second stage (S2) where the thickness in the periphery of the middle part is reduced and also a body part is thickened by applying ironing from the periphery of the middle part of the workpiece toward the body part on the outside; a third stage (S3) where the middle part is formed into nearly planar shape by crushing from the middle part of the workpiece to the periphery of the middle part in the plate thickness direction and also forming is performed so as to widen at nearly constant inclined angle from the periphery of the middle part toward the body part; a fourth stage (S4) where the workpiece is formed into nearly planar shape by crushing the whole workpiece in the plate thickness direction and a fifth stage (S5) where the final shape is formed on the basis of the workpiece formed into the nearly planar shape by the fourth stage (S4). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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