Process for producing tempered steel motor vehicle parts
A process for production of tempered steel support structures for motor vehicles of multiple steel parts including the steps deforming and/or trimming at least two soft-hardened steel parts, hardening the at least two steel parts, joining the steel parts to form a support structure, wherein the support structure is subject to annealing and total stress relieving in a combined thermal treatment only after the joining step.
1 . A process for production of tempered steel support structures for motor vehicles of multiple steel parts including the steps
deforming and/or trimming at least two soft-annealed steel parts,
hardening the at least two steel parts,
joining the steel parts to form a support structure,
wherein an annealing and total stress relieving of the steel parts in the shape of the support structure is carried out in a combined thermal treatment only after joining.
2 . A process according to claim 1 , wherein the combined thermal treatment is carried out in a temperature range of from 550 to 690° C.
3 . A process according to claim 1 , wherein the combined thermal treatment is carried out in a temperature range of 570 to 650° C.
4 . A process according to claim 1 , wherein the hardening is air hardening.
5 . A process according to claim 1 , wherein the joining is by welding.
6 . A process according to claim 1 , wherein the support structure is galvanized following the combined thermal treatment.
7 . A process according to claim 1 , wherein the support structure is cathartically dip coated (KTL) following the combined thermal treatment.
8 . A process according to claim 1 , wherein at least one sheet-shaped and one tubular-shaped steel part are employed.
9 . A process according to claim 1 , wherein at least two steel parts of different thickness are employed.
10 . A process according to claim 1 , wherein joining parts and/or joining means for securing of other components to the support structure are affixed to the support structure prior to the combined thermal treatment.
11 . A process according to claim 8 , wherein the joining parts are screws, rivets or nuts and the joining means are bore holes, screw-in sleeve sockets or folds or creases.
12 . A process according to claim 1 , wherein the steel parts are alloyed steel.
13 . A process for production of tempered steel support structures for motor vehicles of multiple steel parts including the steps
deforming and/or trimming at least two soft-annealed steel parts,
air hardening the at least two steel parts,
joining the air hardened steel parts to form a support structure,
annealing and total stress relieving the support structure in a combined thermal treatment after joining, and
galvanizing the support structure subsequent to the combined thermal treatment.