Cooperative Patent Classification

CPC Definition - Subclass B21H

Printable version [PDF]
Last Updated Version: 2016.11
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal B21D)
Definition statement

This place covers:

Methods and devices for forming metal objects by rolling operations which are not combined with further different metal-working operations.

References
Informative references

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

Continuous rolling of semi-finished products (e.g. continuous rolling of metal strip, wire or tubes in rolling mills)

Roll-forming (i.e. consecutive bending) of metal sheet

Making articles shaped as bodies of revolution (rolling tubes B21B 17/00 - B21B 25/00)
Definition statement

This place covers:

Methods and devices for manufacturing rotationally symmetric bodies.

References
Limiting references

This place does not cover:

Rolling of threads or gear profiles onto cylindrical bodies

Informative references

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

Rolling tubes

Flanging of tubes by rolling

cylinders, e.g. rolled transversely {cross-rolling}
Definition statement

This place covers:

Cross-rolling of cylindrical workpieces with rollers having an axis of rotation parallel to the axis of the workpiece. In most cases recesses are formed on the workpiece by a profile on the rollers which varies in width.

media0.jpg

(from US 4459880 (A))

References
Limiting references

This place does not cover:

Manufacturing of gear toothing by rollers having an axis of rotation parallel to the axis of the workpiece

Informative references

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

Spinning

rolled longitudinally
Definition statement

This place covers:

Forming of profiles or reduction in cross-section by rollers or roller-segments having an axis of rotation not parallel to the axis of the workpiece.

Forming of profiles with roller-segments

media1.jpg
(from WO 2007137543 (A1))

Reduction in cross-section

media2.jpg
(from US 5001916 (A))

References
Informative references

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

Continuous reduction in cross-section of workpieces

characterised by use of rolls having circumferentially varying profile; {Die-rolling}
Definition statement

This place covers:

Forming of profiles or reduction in cross-section with the help of rollers or roller-segments comprising a die

media3.jpg

(from DE 102004016193 (A1))

References
Informative references

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

Cross-rolling of cylindrical workpieces

Making helical bodies or bodies having parts of helical shape (helical gears B21H 5/00; forming tubes or tube walls into helical shape B21D 11/06, B21D 15/04)
Definition statement

This place covers:

Methods and devices for forming a helical structure like a thread or helical flutes on a body by a chipless rolling process. The group covers plastic deformation of the metal body to produce a thread structure without cutting or milling and includes cold thread rolling (swaging).

References
Informative references

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

Making helical gears, i.e. worms

Bending of a body into helical form

Corrugating tubes helically

Coiling wire helically

Forming of helical structures on a body by forging or pressing

Screws

Self-tapping screws

Screws having a special thread-form

Locking screws

Making by means of profiled-rolls {or die rolls}
Definition statement

This place covers:

Methods and devices in which the external screw-thread is manufactured by means of profiled rolls, but which do no comprise or further specify the use of a thread rolling head.

media4.jpg

(from GB 999785 (A))

References
Limiting references

This place does not cover:

Profiled rolls for making gear wheels

{Thread-rolling heads}
Definition statement

This place covers:

Handtools for rolling a thread on a workpiece. General aspects of thread rolling heads and methods of using a thread rolling head not related to a special type of thread-rolling head.

{working axially}
Definition statement

This place covers:

Axial thread rolling methods and devices for forming external screw-threads using a thread-rolling head working axially, i.e. the rollers have a continuous and constant profile about their circumference and run axially along the workpiece. During rolling the workpiece passes through an axial bore within the rolling head.

media5.jpg

(from EP 0417416 (A2))

{working radially}
Definition statement

This place covers:

Radial thread-rolling methods and devices, the thread-rolling head forming a thread in one single rotation of either the workpiece within the rollers or the rolling head about the workpiece. The rollers are provided with a circumferentially varying profile and/or are eccentrically mounted within the rolling head. The workpiece is inserted axially into the rolling head. After insertion of the workpiece the rollers approach the workpiece radially.

media6.jpg

(from US 5924317 (A))

{working tangentially}
Definition statement

This place covers:

Tangential thread-rolling methods and devices, the thread-rolling head being fed tangentially against the rotating workpiece.

In order to allow a tangential insertion of the workpiece into the rolling head, the radial distance between the rollers can be varied. Some rolling heads comprise rollers having a varying circumferential profile in order to allow the insertion of the workpiece.

media7.jpg

(from US 6202461 (B1))

Making by means of profiled members other than rolls, e.g. {reciprocating flat dies or} jaws, moved longitudinally or curvilinearly with respect to each other
Definition statement

This place covers:

Rolling of threads by means of reciprocating flat dies, wherein the dies are reciprocated in relation to one another or a stationary die is provided and the other die is reciprocated.

media8.jpg

(from JP 62158541 (A))

References
Informative references

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

Rolling of cylindrical gears by means of reciprocating flat dies

{Planetary thread rolling}
Definition statement

This place covers:

Planetary thread rolling methods and devices, i.e. rolling of threads between a stationary and a rotatable die.

media9.jpg
media10.jpg

(from JP 57094439 (A)) (from US 3733867 (A))

articles with helicoidal surface (bending strip or the like helically B21D 11/06)
Definition statement

This place covers:

Methods and devices for forming a helical structure like helical fins on a workpiece by rolling, including a workpiece that is rotated and longitudinally moved relative to rolling dies or the dies are rotated and the workpiece is longitudinally moved relative to rolling dies without rotation.

media11.jpg

(from US 3745801 (A))

References
Informative references

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

Manufacturing of helical gear worms

Making gear wheels, {racks, spline shafts or worms}
Definition statement

This place covers:

Methods and devices for manufacturing or finishing geared workpieces by a chipless rolling process. This group does not only cover the manufacturing or finishing of gear wheels, but also of racks, spline shafts and worms.

References
Informative references

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

Manufacturing of gear wheels by forging or pressing

Manufacturing of toothed racks by forging or pressing

Making gears or toothed racks by other methods

Making gear wheels by other methods

{Worms}
Definition statement

This place covers:

Making work wheels or gears with a helical toothing

media12.jpg

(from CH 668726 (A5))

References
Informative references

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

Toothed members, worms

with cylindrical outline, {e.g. by means of die rolls (worms B21H 5/005)}
Definition statement

This place covers:

Methods and devices for manufacturing external gear toothing on cylindrical workpieces by means of die rolls.

media13.jpg

(from JP 59209451 (A))

References
Informative references

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

Finishing of preformed gear wheels

Making of internal gear wheels by rolling

Manufacturing of gear wheels by means of flat dies

Rolling of bevel gears

Spinning in order to manufacture other products than gear wheels

{Finishing gear teeth with cylindrical outline, e.g. burnishing}
Definition statement

This place covers:

Methods and devices for finish-rolling of preformed gear wheels, in particular of sintered gear wheels, by rolling or burnishing, including compacting of sintered powder gearing teeth by rolling.

media14.jpg

(from US 5230234 (A))

References
Informative references

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

Rolling of toothing into cylindrical blanks without preformed gear teeth

Finishing gear teeth by other tools

{Internally geared wheels}
Definition statement

This place covers:

Methods and devices for manufacturing internal gear toothing on cylindrical workpieces. This subgroup also covers the manufacturing of such gears by spinning or by the so-called "Grob"-process, in which eccentrically mounted rollers hit the workpiece

Manufacturing of internal gear toothing by rolling

media15.jpg
(from US 2006272375 (A1))

Manufacturing of internal gear toothing by spinning

media16.jpg
(from US 5384949 (A))

Manufacturing of internal gear toothing by the "Grob"-process

media17.jpg
(from DE 4315503 (A1))

References
Informative references

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

Rolling of external toothing into cylindrical blanks without preformed gear teeth

{by rolling using reciprocating flat dies, e.g. racks (B21H 5/022 takes precedence)}
Definition statement

This place covers:

Manufacturing of gear teeth on a workpiece by relatively reciprocating flat dies or racks.

media18.jpg

(from WO 2004022259 (A1))

References
Informative references

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

Manufacturing of external threads on a workpiece by means of reciprocating flat dies

bevel gears
Definition statement

This place covers:

Methods and devices for rolling bevel gears.

media19.jpg

(from US 6076387 (A))

Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons (nails, pins B21G 3/30)
Definition statement

This place covers:

Methods and devices for manufacturing particular articles by rolling.

References
Informative references

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

Making particular articles by working sheet metal

Making particular articles from wire

Making of needles, pins and nails

Making particular articles by forging or pressing

Making specific metal objects by operations not covered by a single other subgroup

grooved pins; Rolling grooves, e.g. oil grooves, in articles {(B21H 5/00 takes precedence)}
Definition statement

This place covers:

Rolling grooves like oil grooves in general.

media20.jpg

(from EP 1405689 (A1)=

{Rolling annular grooves}
Definition statement

This place covers:

Methods and devices for forming annular grooves in a workpiece by rolling.

media21.jpg

(from JP 57036033 (A))

{Filet rolling, e.g. of crankshafts}
Definition statement

This place covers:

Methods and devices for finishing, i.e. burnishing, of annular grooves by rolling, in particular for deep rolling of crankshaft fillets.

media22.jpg

(from WO 2006119944 (A1))

References
Informative references

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

Burnishing machines or devices

{Rolling helical or rectilinear grooves}
Definition statement

This place covers:

Methods and devices for forming helical or rectilinear grooves in a workpiece by rolling.

Rolling of helical grooves

media23.jpg
(from JP 63281734 (A))

Rolling of rectilinear grooves

media24.jpg
(from US 2003070465 (A1))

References
Informative references

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

Making articles with helicoidal surface by rolling

Making worms by rolling

Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects {, e.g. checkered sheets}
Definition statement

This place covers:

Methods and devices for forming repetitive structures on a workpiece by rolling.

media25.jpg

(from GB 2135613 (A))

{Embossing sheets or rolls}
Definition statement

This place covers:

Methods and devices for roll embossing or roll stamping of workpieces, i.e. for impressing a discrete pattern into a sheet, strip or roll of metal, often for creating a decorative pattern.

media26.jpg

(from EP 1819460 (A1))

References
Informative references

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

Surface roughening or texturing within a rolling mill

Rolls with a roughened or textured surface; methods for making the same

Machines and rolls for embossing decorations

Pressing or stamping ornamental designs

Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this subclass
Definition statement

This place covers:

Methods and devices for feeding blanks to be rolled into or extracting rolled workpieces from a rolling device.