Capsules and pressings for extruding objects, particularly tubes, and a process for producing the capsules and pressings
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United States of America Patent
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Aug 30, 1983
Grant Date -
N/A
app pub date -
Oct 26, 1979
filing date -
Oct 26, 1978
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This invention relates to a capsule for pressings pressed by isostatic pressure and to these pressings used for extruding metallic objects, particularly tubes, of stainless steel, the outer and inner wall of the capsule consisting of thin-walled sheet metal, and at least the outer wall having substantially the same strength properties in the axial direction over its circumference and particularly consisting of a spiral-welded tube and being preferrably provided with a bulge which is directed outwardly against the shrinkage occurring during isostatic pressing, and at least on the front end of the capsule an insert being provided, which consists of one or more pieces of a ductile solid material or a ductile material pressed from powder. The invention further relates to a process for the production of such capsules and pressings and to a process for extruding tubes and to the tubes obtained according to this process.
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