|  | B |
SECTION B — PERFORMING OPERATIONS; TRANSPORTING

SHAPING

|  | B21 |
MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL (casting, powder metallurgy Fulltext... Hierarchy... Expanded...B22; shearing Fulltext... Hierarchy... Expanded...B23D; soldering, welding, flame-cutting Fulltext... Hierarchy... Expanded...B23K; miscellaneous metal-working Fulltext... Hierarchy... Expanded...B23P; punching sheet material in general Fulltext... Hierarchy... Expanded...B26F; processes for changing of physical properties of metals Fulltext... Hierarchy... Expanded...C21D, Fulltext... Hierarchy... Expanded...C22F; electroforming Fulltext... Hierarchy... Expanded...C25D 1/00)

|  | B21 |
Note(s) Combinations of operations covered by different sub-classes of class Fulltext... Hierarchy... Expanded...B21 are dealt with in Fulltext... Hierarchy... Expanded...B23P. Combinations of operations covered by any particular sub-class with operations covered by other classes, e.g. with operations involving removal of material, are also dealt with in Fulltext... Hierarchy... Expanded...B23P, except that if the operations covered by the other classes are subsidiary to the operations properly covered in a single sub-class of Fulltext... Hierarchy... Expanded...B21 the combination is classified in that sub-class. Processes of a kind covered by this class but applied to non-metallic materials may be classified here if they are applicable to metal and cannot be classified fully in one other class.

|  | B21H |
MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS (essentially from sheet metal Fulltext... Hierarchy... Expanded...B21D)

|  | B21H |
Note(s) This sub-class includes only rolling operations which are specially adapted for use in the manufacture of particular objects and which, so far as the invention is concerned, are not combined with any different metal-working operation unless the latter is a subsidiary operation performed in the same machine.

|  | B21H 1/00 |
Making articles shaped as bodies of revolution (rolling tubes Fulltext... Hierarchy... Expanded...Fulltext... Hierarchy... Expanded...B21B 17/00-B21B 25/00)

|  | B21H 1/02 |
· | discs; disc wheels

|  | B21H 1/04 |
· · | with rim, e.g. railway wheels

|  | B21H 1/06 |
· | rings of restricted axial length (extending closed shapes of metal bands by simultaneous rolling at two or more zones Fulltext... Hierarchy... Expanded...B21B 5/00)

|  | B21H 1/08 |
· · | railway wheel rims

|  | B21H 1/10 |
· · | rims for pneumatic tyres

|  | B21H 1/12 |
· · | rings for ball or roller bearings

|  | B21H 1/14 |
· | balls, rollers, cone rollers, or like bodies

|  | B21H 1/16 |
· · | for bearings

|  | B21H 1/18 |
· | cylinders, e.g. rolled transversely

|  | B21H 1/20 |
· · | rolled longitudinally

|  | B21H 1/22 |
· | characterised by use of rolls having circumferentially varying profile [2]

|  | B21H 3/00 |
Making helical bodies or bodies having parts of helical shape (helical gears Fulltext... Hierarchy... Expanded...B21H 5/00; forming tubes or tube walls into helical shape Fulltext... Hierarchy... Expanded...B21D 11/06, Fulltext... Hierarchy... Expanded...B21D 15/04)

|  | B21H 3/02 |
· | external screw-threads

|  | B21H 3/04 |
· · | Making by means of profiled rolls

|  | B21H 3/06 |
· · | Making by means of profiled members other than rolls, e.g. jaws, moved longitudinally or curvilinearly with respect to each other

|  | B21H 3/08 |
· | internal screw-threads

|  | B21H 3/10 |
· | twist-drills; screw-taps

|  | B21H 3/12 |
· | articles with helicoidal surface (bending strip or the like helically Fulltext... Hierarchy... Expanded...B21D 11/06)

|  | B21H 5/00 |
Making gear wheels

|  | B21H 5/02 |
· | with cylindrical outline

|  | B21H 5/04 |
· | bevel gears

|  | B21H 7/00 |
Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons (nails, pins Fulltext... Hierarchy... Expanded...B21G 3/30)

|  | B21H 7/02 |
· | spades; shovels

|  | B21H 7/04 |
· | hoes

|  | B21H 7/06 |
· | ploughshares; axes

|  | B21H 7/08 |
· | forks; rakes

|  | B21H 7/10 |
· | knives; sickles; scythes

|  | B21H 7/12 |
· | horse-shoes; articles of like shape, e.g. wear-resisting attachments for shoes

|  | B21H 7/14 |
· | knurled articles

|  | B21H 7/16 |
· | turbine blades; compressor blades; propeller blades

|  | B21H 7/18 |
· | grooved pins; Rolling grooves, e.g. oil grooves, in articles

|  | B21H 8/00 |
Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects

|  | B21H 8/02 |
· | Rolls of special shape

|  | B21H 9/00 |
Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this sub-class

|  | B21H 9/02 |
· | for screw-rolling machines