Patent ID: 8359893

Claim:
A method for producing a shock absorber for being used as a vehicle bumper crossbeam support, comprising the steps of: providing a planar sheet part having an initial thickness and an initial outline; forming by using a drawing technique said planar sheet part into a partially formed part having a general thickness that is substantially the same as said initial thickness, said partially formed part comprising a plate, a provisional hollow portion extending from said plate, and an end wall closing said provisional hollow portion at one end thereof opposite to the plate, the provisional hollow portion having a revolution shape with respect to an axis perpendicular to the plate, and comprising a first section connected to the plate and having a first average diameter, a second section connected to said end wall and having a second average diameter that is less than said first average diameter, and a transition section connecting said first and second sections, said transition section being configured to act as a deformable configuration intended to bring about a controlled deformation in the event that an axial force above a predetermined threshold is applied; and elongating by using a spinning technique involving material flowing at least part of said second section of the provisional hollow portion of the partially formed part until obtaining a formed part with an elongated hollow portion having an elongated second section which is longer than the second section of the partially formed part, and at least part of which has a final thickness that is thinner than the initial thickness, said formed part being the shock absorber.