CHASSI STAMPED FOR VEHICLE STRUCTURAL ELEMENT, METHOD OF PRODUCTION FOR CHASSI STRUCTURAL FOR VEHICLE ELEMENT, AND PRODUCTION EQUIPMENT FOR CHASSI STRUCTURAL FOR VEHICLE ELEMENT

摘要

a stamped chassis for a vehicle structural member has a tensile strength of 980 mpa or more, the radii of curvature of the first two convex edge portions, the second convex edge portion, and the concave edge portion are each 30 mm or less, the corner radius of a corner wall is 30 mm or less, and the forming depth which is the separation distance between the upper plate portion and the externally extending flange is 40 mm. or more.