Method of sizing metal sleeves using a magnetic field

Details Method of sizing metal sleeves using a magnetic field Method of sizing metal sleeves using a magnetic field

1992-12-14

1994-10-11

Jones, David

Metal deforming

By application of fluent medium, or energy field

By kinetic energy of fluid or field

294192, B21D 2614

Patent

active

053536177

ABSTRACT:
A method of sizing a sleeve of electrically conductive material includes the steps of inserting the sleeve in a die having a seamless inner surface, positioning a magnetic coil inside the sleeve in the die, and sealing the die after the insertion of the sleeve and the positioning of the magnetic coil. A vacuum is created inside the die to avoid air pockets between the outer surface of the sleeve and the inner surface of the die and the magnetic coil is energized to create a magnetic field to expand the sleeve against the inner surface of the die. The process may also be used to form a composite sleeve having an outer layer of material unresponsive to the magnetic field and an inner layer of electrically conductive material.

REFERENCES:
patent: 3126937 (1964-03-01), Brower et al.
patent: 3345732 (1967-10-01), Brower
patent: 3372566 (1968-03-01), Schenk et al.
patent: 3618350 (1971-11-01), Larrimer, Jr.
patent: 4619127 (1986-10-01), Sano et al.

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