Reducing the diameter of tubular bodies
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United States of America Patent
Stats
-
Aug 8, 1989
Grant Date -
N/A
app pub date -
Jun 29, 1988
filing date -
Jun 30, 1987
priority date (Note) -
Expired
status (Latency Note)
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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.
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