Bending tubes using mandrels or the like (B21D11/02 - B21D11/18 take precedence)

Child Classifications

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• B21D 9/01 the mandrel being flexible and engaging the entire tube length
• B21D 9/04 the mandrel being rigid
• B21D 9/05 co-operating with forming members
• B21D 9/08 in press brakes or between rams and anvils or abutments; Pliers with forming dies
• B21D 9/10 by passing between rollers
• B21D 9/12 by pushing over a curved mandrel; by pushing through a curved die
• B21D 9/14 Wrinkle-bending, i.e. bending by corrugating
• B21D 9/15 using filling material of indefinite shape, e.g. sand, plastic material (filling of tubes with such material B21D9/16)
• B21D 9/16 Auxiliary equipment, e.g. machines for filling tubes with sand