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AssigneeDaimlerChrysler AG
InventorsMartin Brodt, Matthias Kroeger, Wolfgang Leutelt, Robert Mayrhofer
Estimating the term…
A method and apparatus is provided for the production of locally reinforced drawn parts, in which the basic sheet of the structural part, in the flat or only preformed state, is connected in a defined position to the reinforcing sheet and this patched composite sheet structure is subsequently jointly formed. In order to improve the production method in terms of the product and result of the method and to relieve the forming tools during joint forming of the parts, the patched composite sheet structure is heated before forming at least to about 800° C. to 850° C. The composite sheet structure is then introduced quickly in the hot state to be rapidly formed. During forming the composite part is fixed mechanically and is subsequently cooled in a defined manner by contacting with the forming tool positively cooled from inside. Passage through a critical temperature range of 800° C. to 500° C. thus takes place with a defined temperature gradient. The step of connecting the reinforcing sheet and the basic sheet can be readily integrated into the forming process by the parts being hard-soldered to one another, with the result that effective corrosion protection at the contact zone can be achieved at the same time.
Method for the production of a three-dimensionally shaped structural part having a basic metal sheet and at least one smaller locally arranged reinforcing metal sheet, comprising connecting the basic metal sheet, in a flat state or in an incompletely formed preforming state, to the reinforcing metal sheet at a point predetermined for a subsequent reinforcing point, and subsequently joint forming the parts of a resulting patched composite metal sheet structure by an openable and closeable forming tool in a forming press, wherein heating of the patched composite metal sheet structure before the joint forming to a temperature which is above a forming temperature of the material, then forming the patched composite metal sheet structure in a hot state into a desired shape with subsequently cooling thereof in the forming tool in a closed state, or in a following fixing tool, with a desired forming state being fixed mechanically, and parts of the patched composite sheet metal structure are heated to above a structural transformation temperature of the material above which the material structure is in an austenitic state.
Method for the production of a three-dimensionally shaped structural part having a basic sheet and at least one smaller locally arranged reinforcing sheet, comprising connecting the basic sheet, in a flat state or in an incompletely formed preforming state, to the reinforcing sheet at a point predetermined for a subsequent reinforcing point, and subsequently joint forming the parts of a resulting patched composite sheet structure by an openable and closeable forming tool in a forming press, wherein heating of the patched composite sheet structure before the joint forming to a temperature which is above a forming temperature of the material, then forming the patched composite sheet structure in a hot state into a desired shape with subsequently cooling thereof in the forming tool in a closed state, or in a following fixing tool, with a desired forming state being fixed mechanically, wherein, the reinforcing sheet is affixed to the basic sheet, at least one of the sheets is provided on its contact surface with a hard solder in a surface-covering manner, the latter being melted during heating to forming temperature and the jointly formed composite sheet structure being cooled at least up to the complete solidification of the hard solder, with the forming state being fixed mechanically in the forming tool which is kept closed.
Dependencies are inferred from the claim text.