Backward extrusion method and product
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United States of America Patent
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Oct 12, 1999
Grant Date -
N/A
app pub date -
May 30, 1997
filing date -
Oct 13, 1994
priority date (Note) -
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Abstract
A method of forming a closed-end vessel by backward extrusion comprises providing an extrusion billet having a front surface with an axial recess and a body of an extrudable material positioned in the recess. Backward extrusion results in the formation of a closed-ended vessel, for example a pressurized gas cylinder, composed of the material of the extrusion billet with a weld bonded inner surface lining of the extrudable material.
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