Patent ID: 6293134
Filing Date: 2001-09-25
Classification: B21D,C21D,Y10T

Abstract:
A method of producing a motor vehicle bumper beam from sheet steel using a progressive die system, said method comprising the steps of:forming a sheet metal blank from sheet steel to form a bumper beam;punching, with a plurality of punches, a plurality of holes in the sheet metal blank, of a predetermined size and configuration, for a plurality of collared holes to be formed in the sheet metal blank;moving the sheet metal blank to at least one stamping machine having a pair of dies configured to stamp the sheet metal blank and form a motor vehicle bumper beam;placing the sheet metal blank between the pair of dies configured to hold the sheet metal blank and configured to collar holes in the sheet metal blank;stamping the sheet metal blank;collaring the plurality of holes in the sheet metal blank and forming the motor vehicle bumper beam; andholding the formed motor vehicle bumper beam for a predetermined period of time between the pair of dies configured to form the motor vehicle bumper beam.