Metal treatment – Stock – Aluminum base
Reexamination Certificate
2000-05-10
2002-01-01
Wyszomierski, George (Department: 1742)
Metal treatment
Stock
Aluminum base
C148S440000
Reexamination Certificate
active
06334916
ABSTRACT:
TECHNICAL FIELD
1. Field of the Invention
The present invention relates to an Al—Mg—Si based alloy sheet that is a metal sheet suitable for an automobile body panel or the like, and that generally belongs to JIS 6000 series, and relates to an Al—Mg—Si based alloy sheet as a material suitable for an engine hood or trunk hood of an automobile, or the like, for which press-formability and in particular stretch-formability and bendability are required, or suitable for an automobile door, a fender or the like, for which deep-drawing formability is required.
2. Description of the Background
Hitherto, cold rolled steel sheets have been used as automobile panel materials. Recently, however, the use of Al alloy sheets has been increasing as the demand that automobile bodies are made lighter has been enlarging to reduce exhaust gas and cut down fuel expense. Aluminum materials that are equal to steel sheets in strength have been known. However, such aluminum materials are in general poor in press-formability such as deep-drawing formability or stretch-formability. Thus, an improvement in press-formability has been strongly demanded. Hitherto, Al—Mg based alloys have been mainly used as aluminum alloy sheets excellent in formability. They are poor in baking hardenability of paint and stretcher strain marks are liable to be produced when they are subjected to press forming. In recent years, therefore, attention has been paid to Al—Mg—Si based alloys of JIS 6000 series. Thus, Al—Mg—Si based alloys as follows have come to be applied to automobile body panels: a 6009 alloy, a 6010 alloy and an alloy disclosed in Japanese Published Unexamined Patent Application No. 5-295475.
Recently, it has been suggested that formability is improved by controlling structure such as texture of sheet materials and a grain size. For example, Japanese Published Unexamined Patent Application No. 5-29547 suggests an Al—Mg—Si based alloy sheet in which deep-drawing formability is improved by optimizing its texture and grain size. Japanese Published Unexamined Patent Application No. 8-325663 suggests an Al—Mg—Si based alloy sheet excellent in press-formability wherein the ratios of respective orientation components are controlled.
However, it cannot be said that these Al—Mg—Si based alloy sheets have sufficient formability. Thus, automobile makers demand a further improvement in formability.
SUMMARY OF THE INVENTION
In the light of such a situation, the present invention has been made. An object thereof is to provide an Al—Mg—Si based alloy sheet whose press-formability (particularly, deep-drawing formability, stretch-formability and bendability) is made higher than conventional Al—Mg—Si based alloy sheets of JIS 6000 series.
REFERENCES:
patent: 5516374 (1996-05-01), Habu et al.
patent: 5580402 (1996-12-01), Fujita et al.
patent: 6117252 (2000-09-01), Barlat et al.
patent: 5-263203 (1993-10-01), None
patent: 5-295475 (1993-11-01), None
patent: 5-295476 (1993-11-01), None
patent: 7-150282 (1995-06-01), None
patent: 8-325663 (1996-12-01), None
patent: 8-325663 (1996-12-01), None
patent: 11-189836 (1999-07-01), None
Prediction of Forming Limit Diagrams of AL-Mg Rolled Sheets Taking Texture Into Account P. Ratchev, P. Van Houtte, B. Verlinden, P. De Smet, P. Neutjens, R. Baartman and P. Drent Textures and Microstructures, 1994, vol. 22, pp. 219-231.
Matsumoto Katsushi
Seki Yuichi
Sugizaki Yasuaki
Yanagawa Masahiro
(Kobe Steel, Ltd.)
Combs-Morillo Janelle
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Wyszomierski George
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