Metal deforming – By use of non-deforming work-gripping clamp and relatively... – By individually non-deforming clamps
Patent
1991-12-23
1993-08-24
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
By individually non-deforming clamps
72151, 72183, 72303, 72406, 29 61, B21D 3104, B21D 1102
Patent
active
052378489
ABSTRACT:
A method and apparatus for expanding and contouring honeycomb preforms into compound curved honeycomb core sheets. Honeycomb preforms are provided having a plurality of face to face, contiguous, strips bonded together at selected narrow areas such that when strips along opposite edges are moved away from each other a sheet having a repeating array of regular hexagonal cells results. Opposite edge strips are secured to two spaced arms located adjacent to a freely rotatable crowned drum having a surface contour corresponding to the desired honeycomb sheet configuration. One of said arms is pivoted about the drum axis. As the arms are moved apart, a flat partially expanded honeycomb sheet initially develops. As arm movement continues, the sheet then comes into sliding contact with the drum surface. When cell expansion is completed, during the final shaping and setting phase, the honeycomb core sheet is in full contact with the drum surface. The resulting compound curved sheet is removed, trimmed and is ready for further processing, such as bonding face sheets thereto. Very uniform hexagonal cells result with no significant distortion. Non-compound, generally cylindrical expanded honeycomb sheets may be formed by utilizing only a slight drum crown.
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Crane Daniel C.
Gilliam Frank D.
Rohr Inc.
Schlesinger Patrick J.
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