Reducing the diameter of tubular bodies

Details Reducing the diameter of tubular bodies Reducing the diameter of tubular bodies

1988-06-29

1989-08-08

Larson, Lowell A.

Metal deforming

By use of closed-die and coacting work-forcer

Forcing work into or within closed die; e.g., forging

72370, 72710, 413 69, B21D 4104

Patent

active

048541494

ABSTRACT:
A method and apparatus for reducing the cross-section of a terminal portion of a tubular body said apparatus comprising an external die which defines a convergent work surface therein of like shape to the exterior of the reduced cross-section to be produced; a plug having a work surface thereon of like shape to the interior of the reduced cross-section to be produced; means to hold the plug in axial alignment with the die during relative motion as between the plug and die to center the plug within the die to define a pass gap of shape and gap width substantially equal to that shape and thickness of the reduced cross-section; means to enter the terminal portion of the tubular body into the pass gap between the plug and die; and means to cause the die to vibrate in a radial mode at an ultrasonic frequency while the terminal portion is progressively reduced to the shape of the pass gap.

REFERENCES:
patent: 3209574 (1965-10-01), Boyd
patent: 3274812 (1966-09-01), Evans
patent: 4261193 (1981-04-01), Boik

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