Method of making a metallic bellows
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United States of America Patent
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Nov 23, 2004
Grant Date -
Jul 10, 2003
app pub date -
Jan 7, 2003
filing date -
Jan 8, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
In a method of fabricating a bellows by bulge forming, an annealing step is carried out during the bulge forming process of the bellows so that the capability of the material to elongate is recovered, and the workability of the bellows is improved in effect. In particular, the ratio of the outer diameter to the inner diameter can be made greater than a value that can be achieved by a single forming step. Therefore, the deflection (stroke) of each annular bulge or pleat can be increased for a given stress or the number of annular bulges and the length of the bellows can be decreased for a given stroke of the bellows.
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