Method of developing complex tool shapes
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United States of America Patent
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Aug 23, 1994
Issued Date -
N/A
app pub date -
Mar 25, 1993
filing date -
Aug 12, 1991
priority date (Note) -
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Abstract
A method is disclosed for developing the contours of forming tools for fabricating metal members of complex shape such as wing skin and fuselage panels for aircraft. A computer simulation is performed of the age forming process on a geometrical representation of a member having the material properties of a desired metal member. The age forming process includes the steps of: a) overforming an unformed member in a tool having a contour of smaller curvature than the contour of the desired member; b) constraining the unformed member in the overformed condition; c) applying a thermal aging cycle to the member; d) cooling the constrained member following the thermal aging cycle; and e) releasing the constrained member from the condition imparted by step (b) and allowing it to spring back to a dimensionally stable condition which defines the desired member having a surface contour of complex shape. From the simulation, the contour of smaller curvature in step (a) to produce the desired metal member following step (e) is determined.
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