Method of sizing and straightening extruded tubes

Details Method of sizing and straightening extruded tubes Method of sizing and straightening extruded tubes

1989-04-17

1990-05-22

Spruill, Robert L.

Metal deforming

By extruding through orifice

With metal-deforming other than by extrusion

72370, B21C 2300, B21C 4500, B21D 300

Patent

active

049266675

ABSTRACT:
A method for extruding a metal tube to a precise internal diameter and a precise linear camber is provided by sizing and straightening the tube with a mandrel after the tube has been extruded to an approximate size. The mandrel is to have a taper so that a smaller end is inserted into the tube and then the mandrel is advanced to cause the tube to be inelastically deformed. The insertion is to proceed at a relatively slow speed in the range of 2.2 feet per minute to 1 inch per second until a desired constant diameter portion of the mandrel has been fully inserted into the tube. The insertion speed thereafter can be increased up to a speed of 48 feet per minute through the remaining length of the mandrel. Withdrawal of the mandrel preferably also occurs at a first slow speed until the constant diameter portion is withdrawn from the tube and then further withdrawal can proceed at a higher speed.

REFERENCES:
patent: 2234863 (1941-03-01), Heetkamp
patent: 2467668 (1949-04-01), Hallberg
patent: 2728373 (1955-12-01), Zimpel
patent: 3078905 (1963-02-01), Somers et al.
patent: 3243986 (1966-04-01), Douthett et al.
patent: 4089199 (1978-05-01), Siemonsen
patent: 4316373 (1982-02-01), Zilges et al.

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