Multi-stage press forming method of plate and plate forming mold device

Abstract

The present disclosure provides a method and device for forming a plate to have a hat shape that protrudes from a bottom surface to a certain height and has a flat surface on an upper portion. In one aspect, the method comprises a) forming a plate to have a protrusion shape having a curved surface on an upper portion such that a thickness reduction rate of the plate is substantially uniform; b) forming corner portions at both ends of the plate by moving the plate whereby the protrusion portion of the plate has a substantially flat surface; and c) forming a flat surface by correcting protruding portions in the corner portions at both ends to make the protruding portions flat.

Dependencies are inferred from the claim text.