Patent Number: 6,293,134

Title: Method of producing a sheet steel product such as a motor vehicle bumper beam in a progressive die system

Abstract: A sheet steel blank is stamped and held in a pair of tools. The blank has holes that are collared by means of mandrels in connection with the forming. The collaring is carried out in the material. In this way, holes with very narrow tolerances can be achieved. Such holes in a bumper beam can be used for guiding the bumper beam during the mounting thereof on a vehicle.

Inventors: Johnson; Martin (Lule.ang., SE)

Assignee: SSAB Hardtech AB

International Classification: C21D 1/62 (20060101); C21D 1/673 (20060101); B21D 053/88 (); B21D 028/32 ()

Expiration Date: 09/25/2018