Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom (B21D3/00 takes precedence); Stretching sheet metal combined with rolling (working sheet metal of limited length by stretching B21D25/00; by localised hammering B21D31/06)

Child Classifications

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• B21D 1/02 by rollers (B21D1/06 takes precedence)
• B21D 1/05 Stretching combined with rolling
• B21D 1/06 Removing local distortions
• B21D 1/12 Straightening vehicle body parts or bodies (B21D1/14 takes precedence)
• B21D 1/14 Straightening frame structures