Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts (straightening of well casings in situ E21B; )

Child Classifications

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• B21D 3/005
• B21D 3/02 by rollers
• B21D 3/10 between rams and anvils or abutments
• B21D 3/12 by stretching with or without twisting (by twisting only B21D11/14)
• B21D 3/14 Recontouring
• B21D 3/16 of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially adapted methods or means