1. CPC Sections
  2. CPC Section B
  3. CPC Class B21
  4. CPC Subclass B21J
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CPC
COOPERATIVE PATENT CLASSIFICATION
​
B21J
FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES (rolling of metal B21B; making particular products by forging or pressing B21K; cladding or plating B23K; finishing surfaces by hammering B23P 9/04; compacting surfaces by blasting with particulate material B24C 1/10; general features of presses, presses for consolidating scrap B30B; furnaces in general F27) [2018-08]
WARNING

  • 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.
B21J 1/00
Preparing metal stock {or similar ancillary operations prior, during or post forging, e.g. heating or cooling (pretreatment for rolling B21B 1/02, B21B 15/0035)} [2013-01]
B21J 1/003
.
{Selecting material} [2013-01]
B21J 1/006
. .
{Amorphous metal} [2013-01]
B21J 1/02
.
Preliminary treatment of metal stock without particular shaping, e.g. salvaging segregated zones, forging or pressing in the rough (modifying the physical properties by deformation C21D 7/00, C22F 1/00) [2013-01]
B21J 1/025
. .
{affecting grain orientation} [2013-01]
B21J 1/04
.
Shaping in the rough solely by forging or pressing [2013-01]
B21J 1/06
.
Heating or cooling methods or arrangements specially adapted for performing forging or pressing operations {(B21J 5/063 takes precedence)} [2013-01]
B21J 3/00
Lubricating during forging or pressing (lubricating in general F16N) [2013-01]
B21J 5/00
Methods for forging, hammering, or pressing (for working sheet-metal or metal tubes, rods, or profiles B21D; for working wire B21F); Special equipment or accessories therefor [2013-01]
B21J 5/002
.
{Hybrid process, e.g. forging following casting} [2013-01]
B21J 5/004
.
{Thixotropic process, i.e. forging at semi-solid state} [2013-01]
B21J 5/006
.
{using ultrasonic waves} [2013-01]
B21J 5/008
.
{Incremental forging} [2013-01]
B21J 5/02
.
Die forging; Trimming by making use of special dies {; Punching during forging} [2017-08]
B21J 5/022
. .
{Open die forging} [2013-01]
B21J 5/025
. .
{Closed die forging} [2013-01]
B21J 5/027
. .
{Trimming} [2013-01]
B21J 5/04
.
by directly applied fluid pressure or explosive action [2013-01]
B21J 5/06
.
for performing particular operations [2013-01]
B21J 5/063
. .
{Friction heat forging (friction heat riveting B21J 15/027)} [2013-01]
B21J 5/066
. . .
{Flow drilling} [2013-01]
B21J 5/068
. .
{Shaving, skiving or scarifying for forming lifted portions, e.g. slices or barbs, on the surface of the material} [2021-08]
B21J 5/08
. .
Upsetting [2013-01]
B21J 5/10
. .
Piercing billets (in combination with extrusion B21C 23/00) [2013-01]
B21J 5/12
. .
Forming profiles on internal or external surfaces (making screw-thread by forging, pressing, or hammering B21K) [2021-08]
B21J 7/00
Hammers; Forging machines with hammers or die jaws acting by impact (hand hammers B25D; electrical features in section H) [2013-01]
B21J 7/02
.
Special design or construction [2013-01]
B21J 7/04
. .
Power hammers [2013-01]
B21J 7/06
. .
Drop hammers [2013-01]
B21J 7/08
. . .
with rigidly-guided hammer [2013-01]
B21J 7/10
. .
with both drive and hammer connected to a fulcrumed lever, e.g. tail hammers [2013-01]
B21J 7/12
. . .
the lever being a spring, i.e. spring hammers [2013-01]
B21J 7/14
. .
Forging machines working with several hammers [2013-01]
B21J 7/145
. . .
{the hammers being driven by a rotating annular driving member} [2013-01]
B21J 7/16
. . .
in rotary arrangements [2013-01]
B21J 7/18
. .
Forging machines working with die jaws, e.g. pivoted, movable laterally of the forging or pressing direction, e.g. for swaging [2016-08]
B21J 7/20
.
Drives for hammers; Transmission means therefor [2013-01]
B21J 7/22
. .
for power hammers [2013-01]
B21J 7/24
. . .
operated by steam, air, or other gaseous pressure [2013-01]
B21J 7/26
. . . .
operated by internal combustion [2013-01]
B21J 7/28
. . .
operated by hydraulic or liquid pressure [2013-01]
B21J 7/30
. . .
operated by electro-magnets [2013-01]
B21J 7/32
. . .
operated by rotary drive, e.g. by electric motor [2013-01]
B21J 7/34
. . .
operating both the hammer and the anvil, so-called counter-tup [2013-01]
B21J 7/36
. .
for drop hammers [2013-01]
B21J 7/38
. . .
driven by steam, air, or other gaseous pressure [2013-01]
B21J 7/40
. . .
driven by hydraulic or liquid pressure [2013-01]
B21J 7/42
. . .
operated by rotary drive, e.g. electric motors [2013-01]
B21J 7/44
. . . .
equipped with belts, ropes, cables, chains [2013-01]
B21J 7/46
. .
Control devices specially adapted to forging hammers, not restricted to one of the preceding subgroups [2017-08]
B21J 9/00
Forging presses [2013-01]
B21J 9/02
.
Special design or construction [2013-01]
B21J 9/022
. .
{multi-stage forging presses (handling devices B21K 27/00)} [2013-01]
B21J 9/025
. .
{with rolling or wobbling dies} [2013-01]
B21J 9/027
. .
{with punches moving along auxiliary lateral directions (B21J 13/025 takes precedence)} [2013-01]
B21J 9/04
. .
Piercing presses [2013-01]
B21J 9/06
. .
Swaging presses; Upsetting presses [2013-01]
B21J 9/08
. . .
equipped with devices for heating the work-piece (electric heating elements H05B) [2013-01]
B21J 9/10
.
Drives for forging presses [2013-01]
B21J 9/12
. .
operated by hydraulic or liquid pressure [2013-01]
B21J 9/14
. . .
in conjunction with electric power [2013-01]
B21J 9/16
. . .
in conjunction with steam or gas power [2013-01]
B21J 9/18
. .
operated by making use of gearing mechanisms, e.g. levers, spindles, crankshafts, eccentrics, toggle-levers, rack bars [2013-01]
B21J 9/20
. .
Control devices specially adapted to forging presses not restricted to one of the preceding subgroups [2017-08]
B21J 11/00
Forging hammers combined with forging presses; Forging machines with provision for hammering and pressing [2013-01]
B21J 13/00
Details of machines for forging, pressing, or hammering [2013-01]
B21J 13/02
.
Dies or mountings therefor [2013-01]
B21J 13/025
. .
{Dies with parts moving along auxiliary lateral directions} [2013-01]
B21J 13/03
. .
Die mountings [2013-01]
B21J 13/04
.
Frames; Guides [2013-01]
B21J 13/06
.
Hammers tups; Anvils; Anvil blocks [2013-01]
B21J 13/08
.
Accessories for handling work or tools [2013-01]
B21J 13/085
. .
{handling of tools} [2013-01]
B21J 13/10
. .
Manipulators (in general B25J) [2013-01]
B21J 13/12
. . .
Turning means [2013-01]
B21J 13/14
. .
Ejecting devices [2013-01]
B21J 15/00
Riveting [2013-01]
B21J 15/02
.
Riveting procedures [2013-01]
B21J 15/022
. .
{Setting rivets by means of swaged-on locking collars, e.g. lockbolts} [2013-01]
B21J 15/025
. .
{Setting self-piercing rivets} [2013-01]
B21J 15/027
. .
{Setting rivets by friction heating} [2013-01]
B21J 15/04
. .
Riveting hollow rivets mechanically [2013-01]
B21J 15/041
. . .
{by pushing a drive-pin} [2013-01]
B21J 15/043
. . .
{by pulling a mandrel} [2013-01]
B21J 15/045
. . . .
{and swaging locking means, i.e. locking the broken off mandrel head to the hollow rivet} [2013-01]
B21J 15/046
. . .
{by edge-curling} [2013-01]
B21J 15/048
. . .
{Setting self-drilling hollow rivets} [2013-01]
B21J 15/06
. .
Riveting hollow rivets by means of hydraulic, liquid, or gas pressure {(portable riveters B21J 15/105)} [2015-11]
B21J 15/08
. .
Riveting by applying heat {, e.g.} to the end parts of the rivets to enable heads to be formed {(B21J 15/027 takes precedence)} [2017-08]
B21J 15/10
.
Riveting machines (electric heating elements H05B) [2013-01]
B21J 15/105
. .
{Portable riveters (pliers for riveting B21J 15/386)} [2013-01]
B21J 15/12
. .
with tools or tool parts having a movement additional to the feed movement, e.g. spin {(B21J 15/027 takes precedence)} [2013-01]
B21J 15/14
. .
specially adapted for riveting specific articles, e.g. brake lining machines [2013-01]
B21J 15/142
. . .
{Aerospace structures} [2013-01]
B21J 15/145
. . .
{Turbines} [2013-01]
B21J 15/147
. . .
{Composite articles} [2013-01]
B21J 15/16
. .
Drives for riveting machines; Transmission means therefor [2013-01]
B21J 15/18
. . .
operated by air pressure or other gas pressure, e.g. explosion pressure [2013-01]
B21J 15/185
. . . .
{by explosion pressure} [2013-01]
B21J 15/20
. . .
operated by hydraulic or liquid pressure [2013-01]
B21J 15/205
. . . .
{Riveting tools having hand operated pumps for building up the hydraulic pressure} [2013-01]
B21J 15/22
. . .
operated by both hydraulic or liquid pressure and gas pressure [2013-01]
B21J 15/24
. . .
operated by electro-magnets [2013-01]
B21J 15/26
. . .
operated by rotary drive, e.g. by electric motor [2013-01]
B21J 15/28
. .
Control devices specially adapted to riveting machines not restricted to one of the preceding subgroups [2017-08]
B21J 15/285
. . .
{for controlling the rivet upset cycle} [2013-01]
B21J 15/30
. .
Particular elements, e.g. supports; Suspension equipment specially adapted for portable riveters [2013-01]
B21J 15/32
. . .
Devices for inserting or holding rivets in position with or without feeding arrangements [2013-01]
B21J 15/323
. . . .
{using a carrier strip} [2013-01]
B21J 15/326
. . . .
{Broken-off mandrel collection} [2013-01]
B21J 15/34
. . . .
for installing {multiple-type} tubular rivets [2013-01]
B21J 15/36
. .
Rivet sets, i.e. tools for forming heads; Mandrels for expanding parts of hollow rivets [2013-01]
B21J 15/365
. . .
{Mandrels for expanding parts of hollow rivets} [2013-01]
B21J 15/38
.
Accessories for use in connection with riveting, e.g. pliers for upsetting; Hand tools for riveting [2013-01]
B21J 15/383
. .
{Hand tools for riveting} [2013-01]
B21J 15/386
. .
{Pliers for riveting} [2013-01]
B21J 15/40
. .
for forming rivet heads [2013-01]
B21J 15/42
. .
Special clamping devices for workpieces to be riveted together, e.g. operating through the rivet holes [2013-01]
B21J 15/44
. .
Rivet hole positioners [2013-01]
B21J 15/46
. .
Positioners for rivets for making tube joints [2013-01]
B21J 15/48
. .
Devices for caulking rivets [2013-01]
B21J 15/50
. .
Removing or cutting devices for rivets [2013-01]
B21J 17/00
Forge furnaces (furnaces for heat treatment C21D 9/00; furnaces in general F27) [2013-01]
B21J 17/02
.
electrically heated (electric heating elements H05B) [2013-01]
B21J 19/00
Blacksmiths requisites not otherwise provided for [2013-01]
B21J 19/02
.
Hearths; Air supply arrangements specially adapted therefor [2013-01]
B21J 19/025
. .
{Tyre heaters} [2013-01]
B21J 19/04
.
Anvils; Associated items [2013-01]