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Method of forming components from sheet material

A sheet and component technology, applied in the improvement field of forming components from alloy sheet metal, can solve problems such as different chemical properties of precipitates

Active Publication Date: 2018-08-03
IMPRESSION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the 7xxx series alloys, the chemical nature of the precipitates may vary

Method used

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  • Method of forming components from sheet material
  • Method of forming components from sheet material
  • Method of forming components from sheet material

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Experimental program
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Embodiment Construction

[0053] figure 1 A conventional pressing process for forming a part from a sheet metal blank is shown. The first stage involves heating the sheet stock to at least its solvus temperature, for example in an oven or heating station. The solvus temperature is an intrinsic property of the particular metal or alloy formed. The sheet blank is then transferred to a press, such as a hydraulic press. The press seal is activated and the companion tool presses the sheet and forms it into its final shape in one step. The part is quenched under cold tool and load and oven hardened to achieve the desired level of hardening. The final product can then be cooled and used. While this arrangement is capable of forming complex shapes, the rapid attainment of the complete final shape of complex shapes and subsequent quenching steps between cold tools may result in less than desired dislocation recovery and failure to achieve desired material properties.

[0054] The present invention aims to...

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Abstract

The present invention provides a method of forming a component (40) from an alloy sheet of material (30) having at least a Solvus temperature and a Solidus temperature of a precipitation hardening phase, the method comprising the steps of: heating the sheet (30) to above its Solvus temperature; initiating forming the heated sheet(30) between matched tools(32, 34) of a die press and forming by means of plastic deformation towards a final shape whilst allowing the average temperature of the sheet (30) to reduce at a first predetermined rate A; interrupting the forming of the sheet for a predetermined first interruption period P1prior to achieving said final shape; and, during the interrupt holding the sheet of material with reduced or no deformation and allowing the average temperature of the sheet to reduce at a second predetermined rate B lower than or equal to the first predetermined rate in order to allow for a reduction in dislocations and completing the forming of the heated sheetinto the final shape whilst allowing the sheet to cool at a third rate C greater than said second rate B.

Description

technical field [0001] The present invention relates to an improved method of forming parts in a molding press, especially from alloy sheet metal. The method is particularly suitable for forming shaped parts with complex shapes, which cannot be easily formed by known techniques. Background technique [0002] To improve the environmental performance of vehicles, automotive OEMs are turning to lightweight alloys for formed components. Traditionally, there has been a fine trade-off between the strength of the alloy used and the formability of the alloy. However, Such new forming techniques allow the manufacture of more complex parts with high-strength lightweight alloy grades such as the 2xxx, 5xxx, 6xxx and 7xxx series of aluminum (Al) alloys. [0003] Age-hardenable aluminum alloy sheet components are typically cold formed in the T4 temper (solution heat treatment and quenching) followed by artificial aging for higher strength, or cold formed in the T6 temper (solution he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C22F1/06
CPCC22F1/06C22F1/04C22F1/05C22F1/053C22F1/057
Inventor 阿利斯泰尔·福斯特
Owner IMPRESSION TECH
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