Method and apparatus for producing tubes and hollow shafts
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United States of America Patent
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Aug 24, 2004
Grant Date -
N/A
app pub date -
Mar 26, 2003
filing date -
Mar 26, 2003
priority date (Note) -
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Abstract
A method and apparatus for producing an end connection by which a tube of variable wall thickness can be formed by being drawn between a die and a mandrel. The end of tubular stock is reduced and its wall thickness increased by being extruded into the space between a reducing die and a mandrel located within the tube, the mandrel having a plug that forms the inner surface of the formed tube as the mandrel and die are retraced from the end. A screw thread is formed on the inner surface of the formed tube and is engaged by a screw thread on a pull pin adapted for attachment to an actuating cylinder that applies a force tending to pull the tube through the die and mandrel.
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