IPC 6 English version B21D !A-B21D 19/16

B21D-B21D01916

SECTION B– PERFORMING OPERATIONS; TRANSPORTING

B 21

MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy B 22; shearing B 23 D; working of metal by the action of a high concentration of electric current B 23 H; soldering, welding, flame-cutting B 23 K; other working of metal B 23 P; punching sheet material in general B 26 F; processes for changing of physical properties of metals C 21 D, C 22 F; electroforming C 25 D 1/00)

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 B 21 B, B 21 C; working or processing of wire B 21 F; cutting or severing devices or machines in general B 26; presses in general B 30 B)

Notes

(1)

This subclass covers cutting or perforating of sheet metal or other stock material.

(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 B 26, B 31.

Straightening; Restoring form; Bending; Corrugating; Flanging

Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom (B 21 D 3/00 takes precedence); Stretching sheet metal combined with rolling (working sheet metal of limited length by stretching B 21 D 25/00; by localised hammering B 21 D 31/06) [2]

by rollers (B 21 D 1/06 takes precedence)

Stretching combined with rolling [2]

Removing local distortions

of hollow bodies made from sheet metal (of substantially open bodies B 21 D 1/10)

of specific articles made from sheet metal, e.g. mudguards

Straightening vehicle body parts or bodies (B 21 D 1/14 takes precedence)

Straightening frame structures

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 E 21 B)

by rollers

arranged on axes skew to the path of the work

arranged on axes rectangular to the path of the work [2]

arranged inclined to a revolving flier rolling frame

which move in an orbit without rotating round the work

between rams and anvils or abutments

by stretching with or without twisting (by twisting only B 21 D 11/14)

Recontouring

of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially-adapted methods or means

Bending sheet metal along straight lines, e.g. to form simple curves (B 21 D 11/06 to B 21 D 11/18 take precedence; corrugating sheet metal B 21 D 13/00; as edge treatment B 21 D 19/00)

between rams and anvils or abutments

on press brakes without making use of clamping means

on brakes making use of clamping means on one side of the work

by drawing procedure making use of dies or forming-rollers, e.g. making profiles

making use of forming-rollers (B 21 D 5/12 takes precedence)

for making tubes

making use of forming-rollers

by passing between rollers (B 21 D 5/06 takes precedence)

Folding; Pleating

Bending rods, profiles, or tubes (B 21 D 11/02 to B 21 D 11/18 take precedence; using mandrels or the like B 21 D 9/00)

over a stationary forming member; by use of a swinging forming member or abutment [2]

022

over a stationary forming member only [2]

024

by a swinging forming member

025

and pulling or pushing the ends of the work

028

and altering the profile at the same time, e.g. forming bumpers

Apparatus with means to keep the profile in shape

over a movably-arranged forming member (B 21 D 7/02 takes precedence)

in press brakes or between rams and anvils or abutments; Pliers with forming dies

by passing between rollers or through a curved die

by abutting members and flexible bending means, e.g. with chains, ropes

with programme control

combined with measuring of bends or lengths

Auxiliary equipment, e.g. for heating or cooling of bends

Bending tubes using mandrels or the like (B 21 D 11/02 to B 21 D 11/18 take precedence)

the mandrel being flexible and engaging the entire tube length

and built-up from loose elements, e.g. series of balls

the mandrel being rigid [2]

co-operating with forming members

with one or more swinging forming members engaging tube ends only

in press brakes or between rams and anvils or abutments; Pliers with forming dies

by passing between rollers

by pushing over a curved mandrel; by pushing through a curved die

Wrinkle-bending, i.e. bending by corrugating

using filling material of indefinite shape, e.g. sand, plastic material (filling of tubes with such material B 21 D 9/16) [2]

Auxiliary equipment, e.g. machines for filling tubes with sand

for heating or cooling of bends

11/

Bending not restricted to forms of material mentioned in only one of groups B 21 D 5/00, B 21 D 7/00, B 21 D 9/00; Bending not provided for in groups B 21 D 5/00 to B 21 D 9/00 (corrugating or bending into wave form B 21 D 13/00, B 21 D 15/00; flanging B 21 D 19/00); Twisting [2]

11/

Bending by stretching or pulling over a die (working sheet metal of limited length by stretching B 21 D 25/00)

11/

Bending into helical or spiral form; Forming a succession of return bends, e.g. serpentine form (making helically seamed tubing B 21 C 37/12)

11/

Making serpentine-shaped articles by bending essentially in one plane

11/

Bending by altering the thickness of part of the cross-section of the work (B 21 D 11/06 takes precedence)

11/

Bending specially adapted to produce specific articles, e.g. leaf springs

11/

the articles being reinforcements for concrete

11/

Twisting

11/

Reinforcing rods for concrete

11/

Crankshafts

11/

Joggling

11/

Bending sheet metal, not otherwise provided for

11/

Auxiliary equipment, e.g. positioning devices

13/

Corrugating sheet metal, rods or profiles; Bending sheet metal, rods or profiles into wave form (tubes B 21 D 15/00)

13/

by pressing

13/

by rolling

13/

by drawing

13/

by combined methods

13/

into a peculiar profiling shape

15/

Corrugating tubes (wrinkle-bending using mandrels or the like B 21 D 9/14) [2]

15/

longitudinally

15/

by applying fluid pressure

15/

transversely, e.g. helically

15/

annularly

15/

by applying fluid pressure

15/

Bending tubes into wave form

17/

Forming single grooves in sheet metal or tubular or hollow articles

17/

by pressing (grooving or notching of bolts, studs, or the like B 21 K 1/54)

17/

by rolling

19/

Flanging or other edge treatment, e.g. of tubes (connecting by making use of folds B 21 D 39/00; flaring out tube ends B 21 D 41/02)

19/

by continuously-acting tools moving along the edge (edge-curling B 21 D 19/12)

19/

shaped as rollers

19/

working inwardly

19/

by single or successive action of pressing tools, e.g. vice jaws

19/

working inwardly

19/

Edge-curling

19/

Reinforcing edges, e.g. armouring same

19/

Reverse flanging of tube ends

B21D 21/00 - B21D 39/20