Process for manufacturing bumper reinforcement

A process for manufacturing a bumper reinforcement having a length, wherein the bumper reinforcement is disposed in front or rear of an automobile body with the length directed in transverse direction of the automobile body, the process comprising:

• joining a central part and lateral parts of unequal thicknesses to form a planar tailored blank;
• and
• press forming the tailored blank by hot pressing to produce a bumper reinforcement having a length and an M-shaped open cross section,
• the bumper reinforcement being curved at end portions of the length toward the open side of the cross section relative to a central portion,
• the bumper reinforcement comprising a central narrower section, end wider sections having a larger width than the central narrower section, and intermediate widening sections gradually widening from the central narrower section to the end wider sections, such that after the hot pressing the joints of unequal thicknesses between the central part and the lateral parts are located within the intermediate widening section.