Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00 (corrugating or bending into wave form B21D13/00, B21D15/00; flanging B21D19/00); Twisting

Child Classifications

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• B21D 11/02 Bending by stretching or pulling over a die (working sheet metal of limited length by stretching B21D25/00)
• B21D 11/06 Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form (making helically seamed tubing B21C37/12)
• B21D 11/08 Bending by altering the thickness of part of the cross-section of the work (B21D11/06 takes precedence)
• B21D 11/10 Bending specially adapted to produce specific articles, e.g. leaf springs
• B21D 11/14 Twisting
• B21D 11/18 Joggling
• B21D 11/20 Bending sheet metal, not otherwise provided for
• B21D 11/22 Auxiliary equipment, e.g. positioning devices