WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING METAL

BPERFORMING OPERATIONS TRANSPORTING B21Mechanical metalworking

B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING METAL

B21D1/00Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom Stretching sheet metal combined with rolling B21D11/00Bending 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 Twisting B21D13/00Corrugating sheet metal, rods or profiles Bending sheet metal, rods or profiles into wave form B21D15/00Corrugating tubes B21D17/00Forming single grooves in sheet metal or tubular or hollow articles B21D19/00Flanging or other edge treatment B21D21/00Combined processes according to methods covered by groups B21D1/00 - B21D19/00 B21D22/00Shaping without cutting, by stamping, spinning, or deep-drawing B21D24/00Special deep-drawing arrangements in, or in connection with, presses B21D25/00Working sheet metal of limited length by stretching B21D26/00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads B21D28/00Shaping by press-cutting Perforating B21D3/00Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts B21D31/00Other methods for working sheet metal, metal tubes, metal profiles B21D33/00Special measures in connection with working metal foils B21D35/00Combined processes according to or processes combined with methods covered by groups B21D1/00 - B21D31/00 B21D37/00Tools as parts of machines covered by this subclass B21D39/00Application of procedures in order to connect objects or parts B21D41/00Application of procedures in order to alter the diameter of tube ends B21D43/00Feeding, positioning or storing devices combined with, or arranged in, or specially adapted for use in connection with, apparatus for working or processing sheet metal, metal tubes or metal profiles Associations therewith of cutting devices B21D45/00Ejecting or stripping-off devices arranged in machines or tools dealt with in this subclass B21D47/00Making rigid structural elements or units B21D49/00Sheathing or stiffening objects B21D5/00Bending sheet metal along straight lines B21D51/00Making hollow objects B21D53/00Making other particular articles B21D55/00Safety devices protecting the machine or the operator, specially adapted for apparatus or machines dealt with in this subclass B21D7/00Bending rods, profiles, or tubes B21D9/00Bending tubes using mandrels or the like