| 摘要 |
Previously, aluminum pressure vessels have been formed from drawn tubes of uniform thickness. The invention provides a method of manufacturing aluminum pressure vessels directly from extruded tubes, the vessels having at least one threaded neck, comprising: a) using a flow forming method to provide a blank having greater wall thickness adjacent the ends thereof than in the centre; b) forming hemispherical ends on said blank; and c) forming an outwardly extended threaded neck.
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