| IPC 7 English version |
| B21D-B21D01916 |
B21D 21/00 - B21D 39/20  |
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| SECTION B – PERFORMING OPERATIONS; TRANSPORTING |
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| B 21 | MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy B22; shearing B23D; working of metal by the action of a high concentration of electric current B23H; soldering, welding, flame-cutting B23K; other working of metal B23P; punching sheet material in general B26F; processes for changing of physical properties of metals C21D, C22F; electroforming C25D 1/00) |
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| B 21 D | WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING (operations of the kind involved in the manufacture of such products B21B, B21C; working or processing of wire B21F; cutting or severing devices or machines in general B26; presses in general B30B) |
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| Notes |
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| (1) | This subclass covers cutting or perforating of sheet metal or other stock material. |
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| (2) | This subclass does not cover the working of metal foils in a manner analogous to the working of paper, which is covered by classes B26, B31. |
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| Subclass Index |
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| TREATMENT CHARACTERISED BY FUNCTION |
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| Straightening |
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| Bending |
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| of sheets |
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| of rods |
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| of tubes |
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| Twisting |
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| Corrugating or grooving or bending into waves |
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| Punching, stamping, deep- drawing, spinning, high-energy forming |
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| EDGE TREATMENT; CONNECTION OF PARTS |
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| OTHER METHODS |
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| COMBINED PROCESSES |
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| HANDLING |
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| OTHER AUXILIARY OPERATIONS |
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| TOOLS |
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| SAFETY |
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| SPECIAL TREATMENT FOR THE MANUFACTURE OF SPECIFIED ARTICLES |
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| Straightening; Restoring form; Bending; Corrugating; Flanging |
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1/ | 00 | Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom (B21D 3/00 takes precedence); Stretching sheet metal combined with rolling (working sheet metal of limited length by stretching B21D 25/00; by localised hammering B21D 31/06) [2] |
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1/ | 02 | . | by rollers (B21D 1/06 takes precedence) |
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1/ | 05 | . | Stretching combined with rolling [2] |
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1/ | 06 | . | Removing local distortions |
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1/ | 08 | . | . | of hollow bodies made from sheet metal (of substantially open bodies B21D 1/10) |
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1/ | 10 | . | . | of specific articles made from sheet metal, e.g. mudguards |
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1/ | 12 | . | Straightening vehicle body parts or bodies (B21D 1/14 takes precedence) |
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1/ | 14 | . | Straightening frame structures |
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3/ | 00 | 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) |
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3/ | 02 | . | by rollers |
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3/ | 04 | . | . | arranged on axes skew to the path of the work |
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3/ | 05 | . | . | arranged on axes rectangular to the path of the work [2] |
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3/ | 06 | . | . | arranged inclined to a revolving flier rolling frame |
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3/ | 08 | . | . | which move in an orbit without rotating round the work |
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3/ | 10 | . | between rams and anvils or abutments |
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3/ | 12 | . | by stretching with or without twisting (by twisting only B21D 11/14) |
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3/ | 14 | . | Recontouring |
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3/ | 16 | . | of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially-adapted methods or means |
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5/ | 00 | Bending sheet metal along straight lines, e.g. to form simple curves (B21D 11/06 to B21D 11/18 take precedence; corrugating sheet metal B21D 13/00; as edge treatment B21D 19/00) |
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5/ | 01 | . | between rams and anvils or abutments |
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5/ | 02 | . | on press brakes without making use of clamping means |
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5/ | 04 | . | on brakes making use of clamping means on one side of the work |
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5/ | 06 | . | by drawing procedure making use of dies or forming-rollers, e.g. making profiles |
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5/ | 08 | . | . | making use of forming-rollers (B21D 5/12 takes precedence) |
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5/ | 10 | . | . | for making tubes |
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5/ | 12 | . | . | . | making use of forming-rollers |
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5/ | 14 | . | by passing between rollers (B21D 5/06 takes precedence) |
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5/ | 16 | . | Folding; Pleating |
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7/ | 00 | Bending rods, profiles, or tubes (B21D 11/02 to B21D 11/18 take precedence; using mandrels or the like B21D 9/00) |
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7/ | 02 | . | over a stationary forming member; by use of a swinging forming member or abutment [2] |
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7/ | 022 | . | . | over a stationary forming member only [2] |
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7/ | 024 | . | . | by a swinging forming member |
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7/ | 025 | . | . | . | and pulling or pushing the ends of the work |
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7/ | 028 | . | . | . | and altering the profile at the same time, e.g. forming bumpers |
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7/ | 03 | . | . | Apparatus with means to keep the profile in shape |
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7/ | 04 | . | over a movably-arranged forming member (B21D 7/02 takes precedence) |
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7/ | 06 | . | in press brakes or between rams and anvils or abutments; Pliers with forming dies |
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7/ | 08 | . | by passing between rollers or through a curved die |
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7/ | 10 | . | by abutting members and flexible bending means, e.g. with chains, ropes |
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7/ | 12 | . | with programme control |
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7/ | 14 | . | combined with measuring of bends or lengths |
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7/ | 16 | . | Auxiliary equipment, e.g. for heating or cooling of bends |
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9/ | 00 | Bending tubes using mandrels or the like (B21D 11/02 to B21D 11/18 take precedence) |
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9/ | 01 | . | the mandrel being flexible and engaging the entire tube length |
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9/ | 03 | . | . | and built-up from loose elements, e.g. series of balls |
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9/ | 04 | . | the mandrel being rigid [2] |
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9/ | 05 | . | co-operating with forming members |
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9/ | 07 | . | . | with one or more swinging forming members engaging tube ends only |
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9/ | 08 | . | in press brakes or between rams and anvils or abutments; Pliers with forming dies |
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9/ | 10 | . | by passing between rollers |
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9/ | 12 | . | by pushing over a curved mandrel; by pushing through a curved die |
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9/ | 14 | . | Wrinkle-bending, i.e. bending by corrugating |
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9/ | 15 | . | using filling material of indefinite shape, e.g. sand, plastic material (filling of tubes with such material B21D 9/16) [2] |
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9/ | 16 | . | Auxiliary equipment, e.g. machines for filling tubes with sand |
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9/ | 18 | . | . | for heating or cooling of bends |
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11/ | 00 | Bending not restricted to forms of material mentioned in only one of groups B21D 5/00, B21D 7/00, B21D 9/00; Bending not provided for in groups B21D 5/00 to B21D 9/00 (corrugating or bending into wave form B21D 13/00, B21D 15/00; flanging B21D 19/00); Twisting [2] |
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11/ | 02 | . | Bending by stretching or pulling over a die (working sheet metal of limited length by stretching B21D 25/00) |
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11/ | 06 | . | Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form (making helically seamed tubing B21C 37/12) |
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11/ | 07 | . | . | Making serpentine-shaped articles by bending essentially in one plane |
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11/ | 08 | . | Bending by altering the thickness of part of the cross-section of the work (B21D 11/06 takes precedence) |
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11/ | 10 | . | Bending specially adapted to produce specific articles, e.g. leaf springs |
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11/ | 12 | . | . | the articles being reinforcements for concrete |
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11/ | 14 | . | Twisting |
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11/ | 15 | . | . | Reinforcing rods for concrete |
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11/ | 16 | . | . | Crankshafts |
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11/ | 18 | . | Joggling |
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11/ | 20 | . | Bending sheet metal, not otherwise provided for |
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11/ | 22 | . | Auxiliary equipment, e.g. positioning devices |
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13/ | 00 | Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form (tubes B21D 15/00) |
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13/ | 02 | . | by pressing |
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13/ | 04 | . | by rolling |
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13/ | 06 | . | by drawing |
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13/ | 08 | . | by combined methods |
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13/ | 10 | . | into a peculiar profiling shape |
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15/ | 00 | Corrugating tubes (wrinkle-bending using mandrels or the like B21D 9/14) [2] |
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15/ | 02 | . | longitudinally |
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15/ | 03 | . | . | by applying fluid pressure |
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15/ | 04 | . | transversely, e.g. helically |
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15/ | 06 | . | . | annularly |
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15/ | 10 | . | . | by applying fluid pressure |
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15/ | 12 | . | Bending tubes into wave form |
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17/ | 00 | Forming single grooves in sheet metal or tubular or hollow articles |
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17/ | 02 | . | by pressing (grooving or notching of bolts, studs, or the like B21K 1/54) |
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17/ | 04 | . | by rolling |
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19/ | 00 | Flanging or other edge treatment, e.g. of tubes (connecting by making use of folds B21D 39/00; flaring out tube ends B21D 41/02) |
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19/ | 02 | . | by continuously-acting tools moving along the edge (edge-curling B21D 19/12) |
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19/ | 04 | . | . | shaped as rollers |
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19/ | 06 | . | . | . | working inwardly |
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19/ | 08 | . | by single or successive action of pressing tools, e.g. vice jaws |
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19/ | 10 | . | . | working inwardly |
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19/ | 12 | . | Edge-curling |
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19/ | 14 | . | . | Reinforcing edges, e.g. armouring same |
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19/ | 16 | . | Reverse flanging of tube ends |
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 | B21D 21/00 - B21D 39/20 |
