Mandrel for cold forging internally profiled tubes or cylinders

Details Mandrel for cold forging internally profiled tubes or cylinders Mandrel for cold forging internally profiled tubes or cylinders

1982-01-22

1984-02-07

Crane, Daniel C.

Metal deforming

Tool and/or tool holder

Having unitary tool-face

72370, 72208, 72401, 72398, 10152R, B21J 1302

Patent

active

044295618

ABSTRACT:
A mandrel for the production of internally profiled, specially threaded tubes or cylinders (2) by the cold forging of tube shaped forging blank (2) around a profiled mandrel (3) by cold forging the workpiece (2) from its one end to the opposite end. The threaded mandrel is parted at or near its axial center and both halves (3a, 3b) are held together axially free under a given radial play. Both ends (8, 13) of the mandrel halves are shaped for the application of a spanner. The mandrel halves can be shaped slightly conical from the ends in towards the parting line, and the flanks of the mandrel threads (14, 15) can be ground so that the threads thicken slightly and continously from the parting line and outwardly towards the mandrel's ends. The thread depth in the mandrel can be slightly deeper than the required thread height on the cold forged tube or product.

REFERENCES:
patent: 4154082 (1979-05-01), Beech

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