Method of forging dual alloy billets

Details Method of forging dual alloy billets Method of forging dual alloy billets

1987-10-26

1989-07-04

Combs, E. Michael

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

72700, B21J 300

Patent

active

048438561

ABSTRACT:
An improved forging billet of dual alloys and an improved method for forging a dual alloy billet. The billet is cylindrical in shape having an outer tubular portion of one alloy and another alloy filling the central opening through the tubular portion, the ends of the billet include a radial flange of the tubular alloy extending a short distance outward at each end of the billet and having a skirt extending from the outer end of the radial flange axially away from the body of the billet to form a circular opening at each end of the billet which has at least as large a diameter as the outer diameter of the outer tubular portion, and a sandwich structure positioned within each of said circular opening including a plurality of layers of a powdered lubricant, preferably boron nitride lubricant, separated by foil layers, preferably a high purity nickel foil. The method includes the step of forging a dual alloy billet as described above into a disc having an interface between the two alloys which is substantially straight and generally parallel to the axis of the disc. The steps of the improved method include positioning the billet between the dies, providing lubrication with the billet to be sufficient to lubricate between the die surfaces and the billet to produce the desired dual alloy disc and forging the billet by moving the dies toward each other sufficiently to produce the desired forged product.

REFERENCES:
patent: 3545240 (1970-12-01), Kent
patent: 4129022 (1978-12-01), Thonnes et al.
patent: 4154075 (1979-05-01), Spiegelberg

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