B21KMAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS making particular articles by working sheet metal without essentially removing material B21D; processing wire B21F; making pins, needles or nails B21G; making particular articles by rolling B21H; forging machines, pressing machines, hammering machines, in general B21J; making chains B21L; plating B23KThis subclass includes only forging, pressing, or hammering operations which are specially adapted for use in the manufacture of particular objects and which, sor 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. 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. B21K1/00Making particular articles by forging, pressing, or hammeringEquipment therefor B21K1/00Making machine elements B21K1/02balls, rolls, or rollers, e.g. for bearings B21K1/025of bullets B21K1/04ball-races or sliding bearing races B21K1/05cages for bearings B21K1/06axles or shafts B21K1/063hollow hollow racks B21K1/768 B21K1/066splined B21K1/08crankshafts B21K1/10of cylindrical form B21K1/12of specially-shaped cross-section B21K1/14fittings B21K1/16parts of pipe or hose couplings B21K1/18pistons or plungers B21K1/185with cooling channels B21K1/20valve parts B21K1/205rocker arms B21K1/22poppet valves, e.g. for internal-combustion engines B21K1/24valve bodiesvalve seats B21K1/26housings or supporting parts, e.g. axle housings, engine mountings B21K1/28wheelsdiscs B21K1/30with gear-teeth B21K1/305helical B21K1/32discs, e.g. disc wheels B21K1/34wheels with spokes B21K1/36with blades B21K1/38rimstyres B21K1/40hubs B21K1/42pulleys, e.g. cable pulleys B21K1/44bolts, studs, or the like making screw-thread B21K1/56; making U-bolts B21K1/74 B21K1/46with heads B21K1/463with recessed heads B21K1/466Heading machines with an oscillating die block B21K1/48Machines working with hammers, e.g. beating in a radial direction, for forming heads B21K1/50Trimming or shearing formed heads, e.g. working with dies B21K1/52double-ended, e.g. with heads on both ends forming heads B21K1/46 B21K1/54with grooves or notches B21K1/56screw-threaded elements B21K1/58rivets B21K1/60hollow or semi-hollow rivets B21K1/62special rivets, e.g. with electrical contacts B21K1/64nuts making screw-thread B21K1/56 B21K1/66from strip bars B21K1/68from round or profiled bars B21K1/70of special shape, e.g. self-locking nuts, wing nuts B21K1/701Weld nuts B21K1/702Clinch nuts B21K1/704Cap nuts B21K1/705Castellated nuts B21K1/707Self-locking nuts B21K1/708wing nuts B21K1/72hooks, e.g. crane hooks, railway track spikes making nails in general B21G B21K1/74forked members or members with two or more limbs, e.g. U-bolts, anchors B21K1/76elements not mentioned in one of the preceding groups B21K1/761rings B21K1/762Coupling members for conveying mechanical motion, e.g. universal joints B21K1/763Inner elements of coupling members B21K1/765Outer elements of coupling members B21K1/766Connecting rods B21K1/767Toothed racks B21K1/768hollow B21K3/00Making engine or like machine parts not covered by sub-groups of B21K1/00Making propellers or the like B21K3/02cylinder heads B21K3/04blades, e.g. for turbinesUpsetting of blade roots B21K5/00Making tools or tool parts, e.g. pliers B21K5/02drilling-tools or other for making or working on holes B21K5/04twisting-tools, e.g. drills, reamers B21K5/06Dressing, e.g. sharpening rock drills B21K5/08drifting tools B21K5/10Forming drill-bit shanks B21K5/12other cutting tools cutlery wares B21K11/00 B21K5/14hand hammers B21K5/16tools for turning nuts B21K5/18handles or parts therefor B21K5/20Making working faces of dies, either recessed or outstanding B21K7/00Making railway appurtenancesMaking vehicle parts B21K7/02parts for permanent way spikes B21K1/72 B21K7/04switch tongues B21K7/06sleepers B21K7/08base plates for rails, e.g. chairs B21K7/10rails joints B21K7/12parts for locomotives or vehicles, e.g. frames, underframes B21K7/14brake rigging or brake parts B21K9/00Reconditioning railroad accessories, e.g. rails B21K11/00Making cutlery waresMaking garden tools or the like B21K11/02knives B21K11/04spoonstable forks B21K11/06scissors B21K11/08sicklesscythes B21K11/10axespicks B21K11/12spadesshovels B21K11/14rakesgarden forks B21K13/00Making locksmiths' goods, e.g. handles for cases B21K13/02hinges B21K15/00Making blacksmiths' goods B21K15/02horseshoesappurtenances therefor B21K15/04caulks B21K15/06metal attachments for footwear, e.g. wearresisting plates B21K17/00Making sport articles, e.g. skates B21K19/00Making articles for agricultural machinery B21K19/02plough bladesploughshares B21K21/00Making hollow articles not covered by a single preceding sub-group essentially from sheet-metal or uniform thin-walled tubes B21D, e.g. B21D41/00, B21D51/00 B21K21/02Producing blanks in the shape of discs or cups as semifinished articles for making hollow articles, e.g. to be deep-drawn or extruded B21K21/04Shaping thin-walled hollow articles, e.g. cartridges B21K21/06Shaping thick-walled hollow articles, e.g. projectiles B21K21/08Shaping hollow articles with different cross-section in longitudinal direction, e.g. nozzles, spark-plugs B21K21/10cone-shaped or bell-shaped articles, e.g. insulator caps B21K21/12Shaping end portions of hollow articles B21K21/14closed or substantially-closed ends, e.g. cartridge bottoms B21K21/16Remodelling hollow bodies with respect to the shape of the cross-section remodelling end portions only B21K21/12 B21K23/00Making other articles B21K23/02members of endless tracks, e.g. track guides, shoes making from sheet-metal B21D B21K23/04flanged articles B21K1/28 takes precedence; flanging tubes B21D B21K25/00Uniting components to form integral members, e.g. turbine wheels and shafts, caulks with inserts, with or without shaping of the components uniting by interference- or press-fitting B23P11/02, B21K19/02 B21K25/005by friction heat forging B21J15/027 takes precedence; friction heat forging per se B21J5/063 B21K27/00AccessoriesAuxiliary devices B21K27/00Handling devices, e.g. for feeding, aligning, discharging, Cutting-off meansArrangement thereof B21K27/02Feeding devices for rods, wire, or strips B21K27/04allowing successive working steps B21K27/06Cutting-off meansArrangements thereof B21K29/00Arrangements for heating or cooling during processing for preparing metal stock to be forged or pressed B21J1/06; heating equipment per se, see the appropriate classes, e.g. H05B B21K31/00Control devices specially adapted for positioning tool carriers