Patent ID: 6857812

Claim:
A method for manufacturing a complex shape structural component with an open cross section, preferably U-shaped, or with a closed cross section by assembling at least two simple sheets of metal parts, at least one of said metal parts having an elastic limit of more than 400 MPa, said method comprising the steps of: bending one or more metal parts to form one or more flanges by at least one bending process; arranging the flange or flanges so that the metal parts being relative to each other in a junction section; crimping the flange or flanges along the junction section of the metal parts to form one or more curved hems in order to assemble said parts; and after said hem forming, blocking said hem to prevent the assembled parts from sliding along the junction by imbricating alternate serrated cut-outs made in the two simple sheets of metal parts in a region to be hem-assembled to cooperate for ensuring said blocking along the junction section, said cut-outs being made with a press during manufacturing.