Forming method of bushing with outer sliding surface

Details Forming method of bushing with outer sliding surface Forming method of bushing with outer sliding surface

1992-12-02

1994-01-04

Rosenbaum, Mark

Metal working

Method of mechanical manufacture

Process for making bearing or component thereof

29898057, 723554, 72368, 72378, 72700, B21D 1900, B21D 5310

Patent

active

052749215

ABSTRACT:
A bushing having an outer sliding surface is produced by a die forming method without machining. A crowning shape is provided to the outer surface so that the outer diameter of the bushing is smaller at its opposite longitudinal ends, and increases progressively toward a central zone of the bushing. A cylindrical bushing blank is fitted on distal end portion of a vertically-movable mandrel. Next, one of an upper die and a lower die is reactively moved toward the other to plastically work the bushing blank by the both dies and the mandrel, thereby working the bushing. An inner diameter of the upper die is larger at its lower end, and decreases progressively away from the lower end, and an inner diameter of the lower die is larger at its upper end, and decreases progressively away from the upper end.

REFERENCES:
patent: 2198074 (1940-04-01), Berry
patent: 2289572 (1942-07-01), Underwood
patent: 2338858 (1944-01-01), Lignian
patent: 2722047 (1955-11-01), Cousino
patent: 4048703 (1977-09-01), Lehnhart
patent: 4122701 (1978-10-01), Lehnhart

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