(0)B21B:0/4:

(0)B21B:0/4:

IPC6

SECTION B - PERFORMING OPERATIONS; TRANSPORTING

ROLLING OF METAL

B21B

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B21B001/00 - B21B001/46

SHAPING

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)

Notes

(1)	This class does not cover:

-	combinations of operations covered by different subclasses of class B 21, which are covered by subclass B 23 P;

-

combinations of operations covered by any particular subclass of class B 21 with operations covered by other classes, e.g. with operations involving removal of material, which are also covered by subclass B 23 P, except that if the operations covered by the other classes are subsidiary to the operations properly covered by a single subclass of B 21 the combination is classified in that subclass.

(2)	Processes of a kind covered by this class but applied to non-metallic materials are classified in this class if they are applicable to metal and cannot be classified fully in another class.

B 21 B

ROLLING OF METAL (auxiliary operations used in connection with metal-working operations covered in B 21, see B 21 C; bending by rolling B 21 D; manufacture of particular objects, e.g. screws, wheels, rings, barrels, balls, by rolling B 21 H; pressure welding by means of a rolling mill B 23 K 20/04)

Note

In this subclass, the following terms or expressions are used with the meanings indicated:

-	"rolling" means rolling operations in which plastic deformations occur;

-	"continuous process" means a process employing a mill train designed to have the workpiece enter one pair of rolls before leaving the preceding pair. [2]

Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section (B 21 B 17/00 to B 21 B 23/00 take precedence; with respect to composition of material to be rolled B 21 B 3/00; extending closed shapes of metal bands by simultaneous rolling at two or more zones B 21 B 5/00; metal-rolling stands as units B 21 B 13/00; continuous casting into moulds having walls formed by moving rolls B 22 D 11/06); Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations

for rolling heavy work, e.g. ingots, slabs, billets, in which the cross-sectional form is unimportant

in a continuous process

in a non-continuous process

for rolling work of special cross-section, e.g. rails, I-beams, U-irons, angle steel (rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects B 21 H 8/00)

in a single two-high or universal rolling mill

in a continuous process

in a non-continuous process

for rolling wire or material of like small cross-section

in a continuous process

in a non-continuous process

for rolling bands or sheets of indefinite length (B 21 B 1/42 takes precedence)

in a continuous process

by cold-rolling

in a non-continuous process

in reversing mills, e.g. with intermediate storage reels for accumulating work

by cold-rolling

for rolling sheets of limited length, e.g. folded sheets, superimposed sheets (B 21 B 1/40 takes precedence; folding sheets before, or separating layers after, rolling B 21 B 47/00) [2]

for rolling foils which present special problems, e.g. because of thinness

for step-by-step or planetary rolling (making tubes by pilgrim-step rolling B 21 B 21/00)

for rolling metal immediately subsequent to continuous casting (metal-rolling stands B 21 B 13/22; continuous casting B 22 D 11/00, e.g. into moulds with rolls B 22 D 11/06) [3]

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