Patent ID: 7628050
Filing Date: 2009-12-08
Classification: B21D,Y10T

Abstract:
1. A press-working method comprising: cutting out a member with a predetermined shape from a sheet material, the member having a longitudinal direction; forming a cut-out portion for forming an opening in the interior region of the member, while allowing a blank part to remain inside the cut-out portion, wherein the cut-out portion corresponds to an outer contour of the opening; bending the member with the predetermined shape to form a bottom portion and a wall portion extending at an angle from the bottom portion as seen in a direction along the longitudinal direction such that the bottom portion has an arched surface as seen in a side view, using at least one plunger and at least one die, the step of bending comprising deforming the outer contour of the opening; and removing the blank part from the cut-out portion to form the opening, wherein an edge of the wall portion is allowed to expand along the plunger and the die while changes in a thickness of the wall portion is controlled by the plunger and the die, wherein the step of cutting out a member is performed such that the wall portion has an edge with a preset shape after the bending step, and wherein the step of bending further includes: