| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method capable of performing molding without causing breakage at a corner part at a low cost, in press molding wherein a material is made to flow in from a bottom face to a vertical wall part. <P>SOLUTION: A plurality of fragile parts (hole parts 12) are previously formed in a region corresponding to the bottom face 3 of a blank 10. By setting the number, position and form of the fragile parts appropriately, flow rate A of the material of the bottom face 3 flowing in the direction orthogonal to an outer edge 4 toward a straight part 9 is so controlled as to be larger than flow rate B of the material of the bottom face flowing in the direction orthogonal to the outer edge 4 toward the corner part 8, so that the material of the straight part 9 is fed to the corner part 8. <P>COPYRIGHT: (C)2012,JPO&INPIT |
