Patent ID: 7971466

Claim:
A press-formed member manufacturing method comprising: bending a blank member to form a preliminary body structure including a pair of side walls and a connecting wall disposed between the side walls with a curved corner portion disposed between the connecting wall and each of the side walls, the connecting wall being continuously convexly curved between the curved corner portions, the bending of the blank member to form the preliminary body structure including forming preliminary curvatures of the curved corner portions of the preliminary body structure; restraining the side walls while applying a pressure to the connecting wall toward the side walls; and increasing thicknesses of the curved corner portions of the preliminary body structure by applying pressure to the connecting wall toward the side walls to fluidly move parts of material in the connecting wall to the curved corner portions, the applying of the pressure to the connecting wall including creating a concave exterior surface with an inflection point at each end of the concave exterior surface adjacent to the curved corner portions to obtain a final shape of the press-formed member with the inflection points being disposed inward of the curved corner portions.