Method for producing a molded sheet metal part from an as-rolled, non-hardenable aluminum alloy

a technology of aluminum alloy and molded sheet metal, which is applied in the direction of heat treatment furnaces, furnace types, furnace types, etc., can solve the problems of limited lightweight design potential, increased strength of pressed parts produced by shaping these soft-annealed, non-hardenable aluminum alloys, and inability to produce complex components from these commercially readily available semi-finished products

Inactive Publication Date: 2010-09-02
BENTELER AUTOMOBILTECHNIK GMBH
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Benefits of technology

[0007]The underlying object of the invention is therefore to provide an option for producing a high-strength co

Problems solved by technology

It is a disadvantage that the strength of pressed parts that are produced by shaping these soft-annealed, non-hardenable aluminum alloys increases considerably only in areas that have undergone significant shaping.
The result is that there is relatively limited potential in lightweight design for using shaped parts that

Method used

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Embodiment Construction

[0008]This object is attained in a method having the features of patent claim 1. One essential step of the invention is that the temperature range at which the sheet is to be heated is less than 300° C., in particular is less than 250° C. This is because of the fact that most of the strength is lost after heating in the furnace when conventional heating methods to temperatures of about 300° C. are used. However, it has been found that both the recrystallization and the recovery of the structure are a function of a temperature threshold. Therefore the invention provides that an as-rolled, non-hardenable aluminum sheet is heated at an extremely high speed. The sheet temper is H12, H14, H16, H18, H19, H22, H24, H26, H28, H32, H34, H36 or H38 according to European Standard EN515:1993, the disclosure of which is included herein by reference. In addition to aluminum, the sheet includes at least magnesium and where necessary manganese as alloy components. Then the sheet is shaped so rapidl...

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Abstract

Method for producing an open molded sheet metal part from a non-hardenable aluminum alloy that has the following steps:
    • a) a sheet is prepared that is made of a non-hardenable aluminum alloy, the temper of which is H12, H14, H16, H18, H19, H22, H24, H26, H28, H32, H34, H36 or H38 according to European Standard EN 515:1993 and that in addition to aluminum includes at least magnesium and where necessary manganese;
    • b) the aluminum is heated at least locally to a temperature between 200° C. and 350° C. within a period of 1 to 60 seconds;
    • c) the heated sheet is placed in a cold forming die of a forming press and the sheet is formed, creating a molded sheet metal part.

Description

CLAIM OF PRIORITY[0001]Applicants hereby claim the priority benefits under the provisions of 35 U.S.C. §119, basing said claim of priority on German Patent Application Serial No. 102009008282.4, filed Feb. 10, 2009.FIELD OF THE INVENTION[0002]The invention relates to a method for producing a molded sheet metal part from an as-rolled, non-hardenable aluminum alloy.BACKGROUND OF THE INVENTION[0003]Producing highly-stressed vehicle components from aluminum sheet is known. Primarily hardenable alloys are used for this. Normally production consists of pre-forming the low-strength aluminum sheet and then aging it to obtain increased strength.[0004]Forming is the only way to increase the strength of those aluminum alloys in which an increase in hardness cannot be attained using a thermal treatment (natural or artificial aging). In order to be able to produce complex geometries from sheets of these alloys, as well, they are generally shaped in a soft temper, like the hardenable alloys. This...

Claims

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Application Information

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IPC IPC(8): C22F1/04
CPCC21D1/34C21D7/02C22F1/04C21D9/46C21D2221/00C21D8/04
Inventor DORR, JOCHENGOMEZ, RAFAEL GARCIAPELLMANN, MARKUS
Owner BENTELER AUTOMOBILTECHNIK GMBH
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