Stretch forming method for a sheet metal skin segment having...

Details Stretch forming method for a sheet metal skin segment having... Stretch forming method for a sheet metal skin segment having...

2006-02-16

2008-03-11

Crane, Daniel C (Department: 3725)

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

By individually non-deforming clamps

C072S466200

Reexamination Certificate

active

07340933

ABSTRACT:
A method of forming an aircraft nacelle nose lip segment. The method includes bending a sheet of metal into a substantially U-shaped workpiece having a spanwise axis, opposed first and second ends, and opposed first and second edges. The method further includes placing the workpiece over a substantially flexible first mandrel, stretching the workpiece in a spanwise direction between the first and second ends, and wrapping the workpiece and first mandrel together about a curved die while stretching the workpiece. The workpiece is thereby plastically deformed to have a first shape. The method may further include removing the workpiece from the first mandrel, and placing the workpiece over a substantially rigid second mandrel that substantially corresponds in shape to the first shape of the workpiece. The workpiece is stretched over the second mandrel in a chordwise direction that is substantially transverse to the spanwise axis of the workpiece, thereby further plastically deforming the workpiece.

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