Metal deforming – By deflecting successively-presented portions of work during... – By use of deflector arranged to bend work transversely of...
Patent
1990-08-16
1993-01-05
Crane, Daniel C.
Metal deforming
By deflecting successively-presented portions of work during...
By use of deflector arranged to bend work transversely of...
72176, B21D 514
Patent
active
051760193
ABSTRACT:
A structural member having a complex shape, such as a return flange z-shape, is manufactured by confining a longitudinally-extending mid-portion of a metal strip between a pair of forming mandrels and running the mandrels and the strip as a unitary workpiece from pass-to-pass of a roll forming machine progressively to form the sheet metal about surfaces of both mandrels. The metal strip and the formed part may have a uniform thickness or may have varying thicknesses. The cross-sectional distribution of the metal mass along the length of the structural member may be modified from the original strip. The structural member may have one or more joggles using a mandrel or mandrels having a complementary recess for each joggle to be formed. In such case, one or more of the passes includes a forming roll assembly that is strongly biased, and or resiliently self-biased, toward each recessed portion of the mandrel to force the sheet metal into each such recess to complete the formation of a joggle. Joggles may be formed in structural members having shapes other than z-shapes. Equipment used in the manufacture of the structural members includes roll stands having appropriately-shaped forming rolls with surfaces that may move vertically, horizontally, or in other directions as needed to accommodate the shapes of the structural members to be formed.
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Article "Roll Forming Advances Suit Today's Structures" by Weimer, Iron Age magazine, Apr. 7, 1980, pp. 57 & 59; copyright Chilton Company 1980; also included is magazine cover and p. 8.
Crane Daniel C.
Dybvig Roger S.
Roll Forming Corporation
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