B21HMAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS essentially from sheet metal B21DThis subclass covers rolling operations which are specially adapted for use in the manufacture of particular objects and which are not essentially combined with any different metal-working operation unless the latter is a subsidiary operation performed in the same machine.In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme. B21H1/00 B21H1/00Making articles shaped as bodies of revolution rolling tubes B21B17/00 - B21B25/00 B21H1/02discsdisc wheels B21H1/04with rim, e.g. railways wheels or pulleys B21H1/06rings of restricted axial length extending closed shapes of metal bands by simultaneous rolling at two or more zones B21B5/00 B21H1/08railway wheel rims B21H1/10rims for pneumatic tyres B21H1/12rings for ball or roller bearings B21H1/14balls, rollers, cone rollers, or like bodies B21H1/16for bearings B21H1/18cylinders, e.g. rolled transversely cross-rolling B21H1/20rolled longitudinally B21H1/22characterised by use of rolls having circumferentially varying profile ; Die-rolling B21H3/00Making helical bodies or bodies having parts of helical shape helical gears B21H5/00; forming tubes or tube walls into helical shape B21D11/06, B21D15/04 B21H3/02external screw-threads ; Making dies for thread rolling B21H3/022combined with rolling splines, ribs, grooves or the like, e.g. using compound dies B21H3/025Rolling locking screws B21H3/027Rolling of self-tapping screws B21H3/04Making by means of profiled-rolls or die rolls B21H3/042Thread-rolling heads B21H3/044working axially B21H3/046working radially B21H3/048working tangentially B21H3/06Making by means of profiled members other than rolls, e.g. reciprocating flat dies or jaws, moved longitudinally or curvilinearly with respect to each other B21H3/065Planetary thread rolling B21H3/08internal screw-threads B21H3/10twist-drillsscrew-taps B21H3/12articles with helicoidal surface bending strip or the like helically B21D11/06 B21H5/00Making gear wheels , racks, spline shafts or worms B21H5/005Worms B21H5/02with cylindrical outline , e.g. by means of die rolls worms B21H5/005 B21H5/022Finishing gear teeth with cylindrical outline, e.g. burnishing B21H5/025Internally geared wheels B21H5/027by rolling using reciprocating flat dies, e.g. racks B21H5/022 takes precedence B21H5/04bevel gears B21H5/045Finishing bevel gear teeth, e.g. burnishing B21H7/00Making articles not provided for in the preceding groups, e.g. agricultural tools, dinner forks, knives, spoons nails, pins B21G3/30 B21H7/002Fasteners, rivets B21H7/005railway sleepers or chains B21H7/007Taper rolling, e.g. leaf springs B21H7/02spadesshovels B21H7/04hoes B21H7/06ploughsharesaxes B21H7/08forksrakes spoons B21H7/10knivessicklesscythes B21H7/12horse-shoesarticles of like shape, e.g. wear-resisting attachments for shoes B21H7/14knurled articles B21H7/16turbine bladescompressor bladespropeller blades B21H7/18grooved pinsRolling grooves, e.g. oil grooves, in articles B21H5/00 takes precedence B21H7/182Rolling annular grooves B21H7/185Filet rolling, e.g. of crankshafts B21H7/187Rolling helical or rectilinear grooves B21H8/00Rolling metal of indefinite length in repetitive shapes specially designed for the manufacture of particular objects , e.g. checkered sheets B21H8/005Embossing sheets or rolls B21H8/02Rolls of special shape B21H9/00Feeding arrangements for rolling machines or apparatus manufacturing articles dealt with in this subclass B21H9/02for screw-rolling machines