Formed automotive part made from an aluminium alloy product and method of its manufacture

摘要

An aluminum alloy rolled sheet product for forming into automotive body panels, and having a yield strength of more than 160 MPa after being subjected to a paint-bake cycle, and having a gauge in a range of 0.5 to 4 mm, and preferably 0.7 to 3.5 mm, and having a composition of, in wt. %: Zn 1.5 to 4.0, Mg 0.3 to 1.5, Cu 0 to 1.0, Ti 0 to 0.15, Fe 0 to 0.35, Si 0 to 0.5, other elements and unavoidable impurities, and balance aluminum. An automotive body part formed from such an aluminum sheet. A method of manufacturing an automotive body part. Also, the use of the aluminum alloy sheet product in such a method of manufacturing.

主权项

1. A method of manufacturing a formed aluminium alloy part of a motor vehicle, the method comprising:
(a) providing a rolled aluminium sheet product having a chemical composition comprising, in wt. %:Zn1.5 to 4.0Mg0.3 to 1.5Cu  0 to 1.0Ti  0 to 0.15Fe  0 to 0.35Si  0 to 0.5, other elements and unavoidable impurities, each maximum 0.05%, total 0.2%, and balance aluminium, and having a gauge in a range of about 0.5 to 4 mm, the aluminium sheet having a yield strength of at least 160 MPa; (b) forming the aluminium alloy sheet to obtain a formed automotive panel; (c) assembling the formed automotive body panel with one or more other metal parts to form an assembly forming a motor vehicle component; and (d) subjecting said motor vehicle component to a paint-bake cycle, wherein the formed automotive body panel has a yield strength of at least 160 MPa after being subjected to the paint-bake cycle.