Patent ID: 8831914

Claim:
A method of simulating the stamping of a metal sheet within a stamping die including a drawbead having a gap G, a height H, and a centerline C 1 perpendicular to a draw direction in which the metal sheet flows through the drawbead, comprising the steps of: iteratively representing the metal sheet in a plurality of successive states from a blank shape to a final stamped shape; representing the drawbead as a two-dimensional flat band with a width W and a centerline C 2 , wherein the drawbead defines a curve at the intersection of the drawbead with a plane perpendicular to centerline C 1 , wherein width W is equal to the length of the curve; and wherein centerline C 2 is parallel with centerline C 1 and is offset from centerline C 1 by a distance d of (W−G)/2; and calculating forces acting on the metal sheet at each successive state to define a next successive state; wherein the calculating step includes a restraining force of the drawbead acting on the metal sheet calculated in response to a predetermined function of a length of the metal sheet engaged in the flat band in respective states.