MANUFACTURING METHOD OF PRESS PART, AND DESIGN METHOD OF LOWER MOLD

摘要

To suppress material edge crack generating on a stretch flange part at a press time, without necessarily increasing the number of press steps, and without changing a press part shape or a blank shape.SOLUTION: In a manufacturing method of a press part 1 having a bending process 20C for bending a vertical wall part 11 continuing to a top plate part 10, and a flange part 12 continuing to the vertical wall part 11 by applying press working to a blank 13 with an upper mold 30 and a lower mold 31, bending is performed after setting the lower mold 31 into a shape in non-contact with the whole surface or a part of the under surface of a flange area becoming the flange part 12 in the blank 13.SELECTED DRAWING: Figure 1