Making hollow articles not covered by a single preceding sub-group (essentially from sheet-metal or uniform thin-walled tubes B21D, e.g. B21D41/00, B21D51/00)

Child Classifications

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• B21K 21/02 Producing blanks in the shape of discs or cups as semifinished articles for making hollow articles, e.g. to be deep-drawn or extruded
• B21K 21/04 Shaping thin-walled hollow articles, e.g. cartridges
• B21K 21/06 Shaping thick-walled hollow articles, e.g. projectiles
• B21K 21/08 Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs
• B21K 21/12 Shaping end portions of hollow articles
• B21K 21/16 Remodelling hollow bodies with respect to the shape of the cross-section (remodelling end portions only B21K21/12)