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IPC 7
  B21D - B21D 19/16  
B21D02100-B21D03920
  B21D 41/00 - B21D 55/00  

SECTION B – PERFORMING OPERATIONS; TRANSPORTING


B 21MECHANICAL 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)


B 21 DWORKING 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)


21/

00Combined processes according to methods covered by groups B21D 1/00 to B21D 19/00


Stamping; Spinning; Deep-drawing; Working sheet metal of limited length by stretching; Punching


22/

00Shaping without cutting, by stamping, spinning, or deep-drawing (otherwise than using rigid devices or tools or yieldable or resilient pads B21D 26/00)

22/

02.Stamping using rigid devices or tools

22/

04..for dimpling (combined with perforating B21D 28/24)

22/

06..having relatively-movable die parts

22/

08..with die parts on rotating carriers

22/

10.Stamping using yieldable or resilient pads

22/

12..using enclosed flexible chambers

22/

14.Spinning

22/

16..over shaping mandrels or formers

22/

18..using tools guided to produce the required profile

22/

20.Deep-drawing (special deep-drawing arrangements in, or in connection with, presses B21D 24/00)

22/

21..without fixing the border of the blank  [2]

22/

22..with devices for holding the edge of the blanks (B21D 22/24 to B21D 22/30 take precedence; shaping over a die without external former B21D 11/02)

22/

24..involving two drawing operations having effects in opposite directions with respect to the blank

22/

26..for making peculiarly, e.g. irregularly, shaped articles

22/

28..of cylindrical articles using consecutive dies

22/

30..to finish articles formed by deep-drawing


24/

00Special deep-drawing arrangements in, or in connection with, presses

24/

02.Die-cushions

24/

04.Blank holders; Mounting means therefor

24/

06..Mechanically spring-loaded blank holders

24/

08..Pneumatically or hydraulically loaded blank holders

24/

10.Devices controlling or operating blank holders independently, or in conjunction with dies

24/

12..mechanically

24/

14..pneumatically or hydraulically

24/

16.Additional equipment in association with the tools, e.g. for shearing, for trimming


25/

00Working sheet metal of limited length by stretching, e.g. for straightening  [2]

25/

02.by pulling over a die  [2]

25/

04.Clamping arrangements  [2]


26/

00Shaping without cutting otherwise than using rigid devices or tools or yieldable or resilient pads, i.e. applying fluid pressure or magnetic forces (stamping using resilient pads B21D 22/10)

26/

02.by applying fluid pressure  [2]

26/

06..by shock waves

26/

08...generated by explosives, e.g. chemical explosives

26/

10...generated by evaporation, e.g. of wire, of liquids

26/

12...initiated by spark discharge  [2]

26/

14.applying magnetic forces


28/

00Shaping by press-cutting; Perforating

28/

02.Punching blanks or articles with or without obtaining scrap (cutting nails or pins from strips or sheet material B21G 3/26); Notching

28/

04..Centering the work; Positioning the tools

28/

06..Making more than one part out of the same blank; Scrapless working

28/

08...Zig-zag sequence working

28/

10..Incompletely punching in such a manner that the parts are still coherent with the work

28/

12..Punching using rotatable carriers

28/

14..Dies (ejecting or stripping-off devices arranged in punching machines or tools B21D 45/00)

28/

16..Shoulder or burr prevention

28/

18..Yieldable, e.g. rubber, punching pads

28/

20..Applications of drives

28/

22..Notching the peripheries of circular blanks, e.g. laminations for dynamo-electric machines

28/

24.Perforating, i.e. punching holes

28/

26..in sheets or flat parts

28/

28..in tubes or other hollow bodies

28/

30..in annular parts, e.g. rims

28/

32..in other articles of special shape

28/

34..Perforating tools; Die holders

28/

36..using rotatable work or tool holders



31/

00Other methods for working sheet metal, metal tubes, metal profiles (deforming one surface of tubes helically by rolling B21H 3/00; upsetting B21J 5/08; working metal by removing material therefrom B23; embossing B44B)

31/

02.Stabbing or piercing, e.g. for making sieves (dimpling B21D 22/04; perforating by punching B21D 28/24)

31/

04.Expanding other than provided for in groups B21D 1/00 to B21D 28/00, e.g. for making expanded metal (B21D 47/00 takes precedence; enlarging tube ends B21D 41/02)  [2]

31/

06.Deforming sheet metal, tubes or profiles by sequential impacts, e.g. hammering, beating, peen forming (forging hammers B21J 7/00)


33/

00Special measures in connection with working metal foils, e.g. gold foils (cutting or perforating of metal foil analogous to paper B26)


35/

00Combined processes according to methods covered by groups B21D 1/00 to B21D 31/00 (B21D 21/00 takes precedence)


37/

00Tools as parts of machines covered by this subclass (forms or constructions of tools uniquely adapted for particular operations, see in the relevant groups for the operations)

37/

01.Selection of materials  [2]

37/

02.Die constructions enabling assembly of the die parts in different ways (B21D 37/06 takes precedence)

37/

04.Movable or exchangeable mountings for tools

37/

06..Pivotally-arranged tools, e.g. disengageable (die sets with dies pivoted to one another B21D 37/12)

37/

08.Dies with different parts for several steps in a process

37/

10.Die sets; Pillar guides

37/

12..Particular guiding equipment; Special arrangements for interconnection or cooperation of dies

37/

14.Particular arrangements for handling and holding in place complete dies

37/

16.Heating or cooling

37/

18.Lubricating

37/

20.Making tools by operations not covered a single other subclass


39/

00Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating (riveting B21J; uniting components by forging or pressing to form integral members B21K 25/00; welding B23K; press-fitting, force-fitting, or shrinking in general B23P 11/00, B23P 19/00; by adhesives F16B 11/00); Tube expanders

39/

02.of sheet metal by folding, e.g. connecting edges of a sheet to form a cylinder

39/

03.of sheet metal otherwise than by folding  [2]

39/

04.of tubes with tubes; of tubes with rods

39/

06.of tubes in openings, e.g. rolling-in

39/

08.Tube expanders

39/

10..with rollers for expanding only

39/

12..with rollers for expanding and flanging

39/

14..with balls

39/

16..with torque limiting devices

39/

18..Rollers of special shape

39/

20..with mandrels, e.g. expandable  [2]

  B21D - B21D 19/16    B21D 41/00 - B21D 55/00  
 

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