CPC Definition - Subclass B21C

Last Updated Version: 2019.02
MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
Definition statement

This place covers:

The methods and devices for working metal as follows:

Metal drawing (covered by B21C 1/00 - B21C 19/00)

Metal extrusion (covered by B21C 23/00 - B21C 35/00)

Methods for manufacturing metal sheets, bars, wires tubes or the like. (covered by B21C 37/00)

Devices for cleaning metal products adapted for use with machines of this subclass (covered by B21C 43/00)

Separating mandrels from work (covered by B21C 45/00)

Winding-up, coiling, winding-off metal wire or metal band (covered by B21C 47/00)

Devices for temporarily accumulating material (covered by B21C 49/00)

Measuring, gauging, indicating, counting, marking devices adapted for use with subclasses B21B - B21F (covered by B21C 51/00)

Other subject-matter concerning the manufacture of metal sheets, wire, rods, tubes or profiles otherwise than by rolling as well as other subject-matter concerning auxiliary operations used in connection with metal-working without essentially removing material (covered by B21C 99/00).

References
Limiting references

This place does not cover:

Working or processing of sheet metal or metal tubes, rods or profiles

B21D

Informative references

Attention is drawn to the following places, which may be of interest for search:

Methods for manufacturing metal sheets, bars, wires tubes or the like by rolling

B21B

Devices for cleaning metal sheet from scale, i.e. descaling, in combination with rolling

B21B 45/00

Making forged or pressed products

B21K

Soldering, welding

B23K

Other working of metal, combined operations

B23P

Transport or storage devices, e.g. conveyors for loading

B65G

Handling thin or filamentary material, e.g. sheets, webs, cables

B65H

Devices for cleaning in general

C08B

Manufacture of metal sheets, metal wire, metal rods, metal tubes by drawing
Definition statement

This place covers:

Methods, devices and drives for metal drawing.

Metal drawing consists in reducing the cross-section of a work piece (e.g. reducing the diameter of a metal rod or wire) by forcing it through a die. Metal drawing differs from extrusion by the lower rate of reduction.

media0.jpgSource:EP1393828

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Metal drawing tools, dies and mandrels

B21C 3/00

Pointing

B21C 5/00

Cooling, heating or lubricating drawing material

B21C 9/00

Profiling tools for metal drawing; Combinations of dies and mandrels
Definition statement

This place covers:

All aspects relating to metal drawing tools (dies, die holders, mandrels).

media1.jpgSource: WO2008010614

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Metal drawing machines, methods or drives

B21C 1/00

Pointing

B21C 5/00

Cooling, heating or lubricating drawing material

B21C 9/00

Pointing; Push-pointing
Definition statement

This place covers:

Reducing the cross-section of the material's leading end for easing its insertion into the drawing die prior to drawing.

media2.jpgSource: DE3634229

Cooling, heating or lubricating drawing material (B21C 3/14 takes precedence)
Definition statement

This place covers:

All aspects of cooling, heating or lubricating the drawing material and/or the drawing devices or dies.

media3.jpgSource: DE19817088

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Metal drawing machines, methods or drives

B21C 1/00

Metal drawing tools, dies and mandrels

B21C 3/00

Lubricants in general

C10M

Devices for straightening wire or like work combined with or specially adapted for use in connection with drawing or winding machines or apparatus
Definition statement

This place covers:

Devices either:

  • for straightening wire, wherein the straightening action is realized by using drawing dies, or
  • for straightening wire, which devices are used in combination with wire drawing or winding machines (e.g. straightening prior to drawing).
References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Winding, coiling

B21C 47/00

Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made there from.

B21D 3/08

Working of wire by straightening

B21F 1/02

Extruding metal; Impact extrusion
Definition statement

This place covers:

Methods and devices for metal extrusion; products obtained by metal extrusion as well as lubrication aspects.

The title refers to impact extrusion. This is however only one specific metal extrusion technique covered by this group.

Metal extrusion consists in forcing solid metal through a suitably shaped orifice using compressive forces. Metal extrusion differs from metal drawing by the higher rate of reduction.

media4.jpgSource: US2007227221

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Tools for metal extrusion (i.e. mandrels and dies)

B21C 25/00

Rams, plungers or disks therefore

B21C 26/00

Containers for metal to be extruded

B21C 27/00

Cooling or heating work or parts of the extrusion press

B21C 29/00

Control or measuring devices in relation with extrusion

B21C 31/00

Feeding extrusion presses with metal to be extruded

B21C 33/00

Removing work or waste from extrusion presses; Cleaning

B21C 35/00

Continuous casting

B22D

Extrusion of plastic material

B29C 48/00

Profiling tools for metal extruding
Definition statement

This place covers:

Dies and mandrels for metal extrusion, including dies and mandrels for coating work by extrusion or having a section variable during extruding.

The extrusion die and/or mandrel define/s the section through which the billet is forced, thereby defining the cross sectional shape of the extruded product.

media5.jpgSource: WO2007029888

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Extrusion devices and methods

B21C 23/00

Rams, plungers or disks therefore

B21C 26/00

Containers for metal to be extruded

B21C 27/00

Cooling or heating work or parts of the extrusion press

B21C 29/00

Control or measuring devices in relation with extrusion

B21C 31/00

Feeding extrusion presses with metal to be extruded

B21C 33/00

Removing work or waste from extrusion presses; Cleaning

B21C 35/00

Rams or plungers; Discs therefor
Definition statement

This place covers:

Rams or plungers for metal extrusion; the disks therefore as well as the dummy blocks.

The extrusion ram or plunger is normally the element applying the extrusion pressure to the billet to be extruded.

media6.jpgSource: DE10036463

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Extrusion devices and methods

B21C 23/00

Tools for metal extrusion (i.e. mandrels and dies)

B21C 25/00

Containers for metal to be extruded

B21C 27/00

Cooling or heating work or parts of the extrusion press

B21C 29/00

Control or measuring devices in relation with extrusion

B21C 31/00

Feeding extrusion presses with metal to be extruded

B21C 33/00

Removing work or waste from extrusion presses; Cleaning

B21C 35/00

Containers for metal to be extruded (B21C 29/02 takes precedence)
Definition statement

This place covers:

The container is the element into which the billet is placed and pressurized for extrusion.

media7.jpgSource: DE3342617

References
Limiting references

This place does not cover:

Containers comprising cooling or heating elements

B21C 29/02.

Informative references

Attention is drawn to the following places, which may be of interest for search:

Extrusion devices and methods

B21C 23/00

Tools for metal extrusion (i.e. mandrels and dies)

B21C 25/00

Rams, plungers or disks therefore

B21C 26/00

Cooling or heating work or parts of the extrusion press

B21C 29/00

Control or measuring devices in relation with extrusion

B21C 31/00

Feeding extrusion presses with metal to be extruded

B21C 33/00

Removing work or waste from extrusion presses; Cleaning

B21C 35/00

Cooling or heating work or parts of the extrusion press; {Gas treatment of work}
Definition statement

This place covers:

All aspects relating to heating or cooling in combination with metal extrusion.

media8.jpgSource: GB1058854

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Extrusion devices and methods

B21C 23/00

Tools for metal extrusion (i.e. mandrels and dies)

B21C 25/00

Rams, plungers or disks therefore

B21C 26/00

Containers for metal to be extruded

B21C 27/00

Control or measuring devices in relation with extrusion

B21C 31/00

Feeding extrusion presses with metal to be extruded

B21C 33/00

Removing work or waste from extrusion presses; Cleaning

B21C 35/00

Control devices, e.g. for regulating the pressing speed or temperature of metal (B21C 25/08 takes precedence); Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses (measuring devices of more general interest within subclass B21C, see group B21C 51/00)
Definition statement

This place covers:

Control devices, e.g. for regulating the pressing speed or temperature of metal; Measuring devices, e.g. for temperature of metal, combined with or specially adapted for use in connection with extrusion presses.

media9.jpgSource: EP2361700

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Extrusion devices and methods

B21C 23/00

Tools for metal extrusion (i.e. mandrels and dies)

B21C 25/00

Rams, plungers or disks therefore

B21C 26/00

Containers for metal to be extruded

B21C 27/00

Cooling or heating work or parts of the extrusion press

B21C 29/00

Feeding extrusion presses with metal to be extruded

B21C 33/00

Removing work or waste from extrusion presses; Cleaning

B21C 35/00

Measuring devices of more general interest

B21C 51/00

Feeding extrusion presses with metal to be extruded {; Loading the dummy block}
Definition statement

This place covers:

All aspects concerning operations or devices upstream of the extrusion press or extrusion process, and specifically linked to it, including e.g.feeding conveyors and grippers used to provide a workpiece to an extrusion press.

media10.jpgSource: EP0486436

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Extrusion devices and methods

B21C 23/00

Tools for metal extrusion (i.e. mandrels and dies)

B21C 25/00

Rams, plungers or disks therefore

B21C 26/00

Containers for metal to be extruded

B21C 27/00

Cooling or heating work or parts of the extrusion press

B21C 29/00

Control or measuring devices in relation with extrusion

B21C 31/00

Removing work or waste from extrusion presses; Cleaning

B21C 35/00

Removing work or waste from extruding presses; Drawing-off extruded work (in connection with the extruding of bent tubes or rods B21C 23/12); Cleaning dies, ducts, containers, or mandrels
Definition statement

This place covers:

All aspects concerning operations or devices downstream of the extrusion press or extrusion process, and specifically linked to it, including e.g.:

  • Removing work or waste from extruding presses;
  • Drawing off extruded work;
  • Cleaning dies, ducts, containers or mandrels.
  • Scrapers and scraping knives for cutting-off or removing the waste or for removing sections from the extruded work, e.g. removing a strip to create an open profile.

media11.jpgSource: EP0787543

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Extrusion devices and methods

B21C 23/00

Tools for metal extrusion (i.e. mandrels and dies)

B21C 25/00

Rams, plungers or disks therefore

B21C 26/00

Containers for metal to be extruded

B21C 27/00

Cooling or heating work or parts of the extrusion press

B21C 29/00

Control or measuring devices in relation with extrusion

B21C 31/00

Feeding extrusion presses with metal to be extruded

B21C 33/00

Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for (by rolling B21B; by working or processing semi-finished sheet metal, profiles, tubes, or wire B21D or B21F; by casting B22; by material-removing machine tools B23; by welding, e.g. cladding or plating B23K; by grinding or polishing B24; by electroforming C25D 1/00; by drawing or extruding, see the relevant groups); Manufacture of tubes of special shape
Definition statement

This place covers:

Processes and devices for the manufacture of:

Metal sheets (covered by B21C 37/02).

Metal wires (covered by B21C 37/04).

Metal tubes (covered by B21C 37/08-B21C 37/14).

Metal tubes of special shape (covered by B21C 37/15-B21C 37/298).

Finishing tubes, e.g. sizing, burnishing (covered by B21C 37/30).

media12.jpgSource: EP1880776

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Metal extrusion devices and methods

B21C 23/00

Bending of metal sheet along straight lines

B21D 5/00

Manufacture of metallic fibers

B23P 17/06

Devices for cleaning metal products combined with or specially adapted for use with machines or apparatus provided for in this subclass
Definition statement

This place covers:

All aspects relating to cleaning metal products, wherein the cleaning action is realized by using machines of B21C or wherein the cleaning action is used in combination with machines of B21C.

This group includes in particular, cleaning metal products, especially descaling, by metal drawing, or with methods associated to metal drawing or winding processes.

media13.jpgSource: WO2006200502

Separating mandrels from work or vice versa
Definition statement

This place covers:

Separation of mandrels from work or vice-versa.

media14.jpgSource: JP61092708

Winding-up, coiling or winding-off metal wire, metal band or other flexible metal material characterised by features relevant to metal processing only (coiling wire into particular forms B21F 3/00; hot coilers in connection with heat-treatment apparatus C21D 9/68)
Definition statement

This place covers:

Methods and devices for coiling (winding) and uncoiling (unwinding) of metal wire, band or similar metal product.

Associated operations, like feeding or guiding the material, transferring coils, joining wire or band ends, treating the material, holding on drums or coil holders.

media15.jpgSource: US5170653

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Joining metal sheets

B21B 15/0085

Coiling wire into particular form

B21F 3/00

Unwinding welding material

B23K 9/1333

Furnace coilers, Hot coilers

C21D 9/68

Winding electrical elements

H01F 41/00, H02K 15/00

Devices for temporarily accumulating material
Definition statement

This place covers:

Devices for temporarily accumulating metallic material (e.g. metal bands or wires).

media16.jpgSource: DE4243409

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Accumulating rolled material

B21B 41/00

Accumulating material in general

B65H 20/00

Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses B21B - B21F
Definition statement

This place covers:

Mainly detecting flaws of metal sheets and positioning or marking said flaws.

However, this group has been conceived very generally, which is reflected in its content.

media17.jpgSource: WO2011145168

References
Informative references

Attention is drawn to the following places, which may be of interest for search:

Embossing, marking

B44B

Measuring

G01N

Subject matter not provided for in other groups of this subclass
Definition statement

This place covers:

Subject-matter not provided for in other groups of this subclass concerning the manufacture of metal sheets, wire, rods, tubes or profiles otherwise than by rolling

Subject-matter not provided for in other groups of this subclass concerning auxiliary operations used in connection with metal-working without essentially removing material.