B21K MAKING 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 B23K)
Introduced: September 1968
Description
B21K covers mechanical metal-working processes that form metal products through forging, pressing, or similar deformation techniques without substantial material removal. This includes manufacturing discrete metal articles such as rivets, bolts, horseshoes, wheels, and other components shaped by impact, pressure, or combined force. The classification encompasses both the machinery and methods for cold or hot forming operations, as well as finishing steps integral to the forging or pressing process. Adjacent classes (B21C-B21F) address continuous or specialized metal-forming operations, while B21H-B21J cover metal-cutting and surface-treatment activities excluded from this subclass.
Title
Titles differ between systems:
IPC: MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
CPC: MAKING 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 B23K)
Full Title
Full titles differ between systems:
MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
MAKING 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 B23K)
IPC and CPC are identically structured here. All 16 subcodes exist in both systems.
5 shared codes have differing titles between IPC and CPC.
Child Classifications
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- B21K 21/00 Making 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) IPC+CPC Available in IPC and CPC
- B21K 25/00 Uniting 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) +1 CPC IPC+CPC Available in IPC and CPC
- B21K 27/00 Handling devices, e.g. for feeding, aligning, discharging, Cutting-off means; Arrangement thereof IPC+CPC Available in IPC and CPC
- B21K 29/00 Arrangements 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) IPC+CPC Available in IPC and CPC
- B21K 3/00 Making engine or like machine parts not covered by sub-groups of B21K1/00; Making propellers or the like IPC+CPC Available in IPC and CPC
- B21K 31/00 Control devices specially adapted for positioning tool carriers IPC+CPC Available in IPC and CPC