Other methods for working sheet metal, metal tubes, metal profiles (deforming one surface of tubes helically by rolling B21H3/00; upsetting B21J5/08; working metal by removing material therefrom B23; embossing B44B)

Child Classifications

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• B21D 31/005
• B21D 31/02 Stabbing or piercing, e.g. for making sieves (dimpling B21D22/04; perforating by punching B21D28/24)
• B21D 31/04 Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal (B21D47/00 takes precedence; enlarging tube ends B21D41/02)
• B21D 31/06 Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming (forging hammers B21J7/00)