The aluminum alloy outer panel material where heme process manner of the aluminum alloy

摘要

PROBLEM TO BE SOLVED: To provide a hemming process of an aluminum alloy panel stock and an aluminum alloy panel stock for hemming process capable of simultaneously satisfying hemming workability and artificial aging hardenability under the cryogenic temperature. ;SOLUTION: A flat hemming process (figure C) characterized by the feature that the process bonds an aluminum alloy outer panel stock 1 having the wall thickness of 0.8 mm or more to an aluminum alloy inner panel stock 2 having the wall thickness of 1.0 mm or less, and when the flat hemming process is conducted in the condition that a clearance exists between the end portion of the inner panel stock 2 inserted into the hemming portion 16 of the outer panel stock 1 and the internal surface of the hemming portion, the outer panel stock 1 includes Si: 0.4-1.3%, Mg: 0.4-1.2%, and Si/Mg is 1 or more, Mn: 0.15% or less and regulates Cu: 0.1% or less, and proof stress is 110-140 MPa and the outer panel stock is a Si excessive type Al-Mg-Si system aluminum alloy and the outer panel stock after the flat hemming process is granted by 2% stretch and then, proof stress after the artificial aging treatment of 150°C×20 minutes is made 170 MPa or more.;COPYRIGHT: (C)2003,JPO