B24B MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
Introduced: September 1968
Description
B24B encompasses machines, devices, and processes for grinding and polishing operations, including surface finishing techniques that use abrasive tools or compounds. The subclass covers grinding machines (stationary and portable), polishing equipment, lap machines, and honing devices, as well as methods for dressing or conditioning abrading surfaces to maintain their cutting efficiency. It includes systems for supplying and controlling grinding, polishing, or lapping agents (coolants, lubricants, abrasive slurries) during finishing operations. Adjacent subclass B24A covers abrasive articles themselves, while B24C and B24D address specific grinding applications in tool sharpening and saw blade maintenance.
Title
Titles differ between systems:
IPC: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
CPC: MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
Full Title
Full titles differ between systems:
MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING (grinding of gear teeth B23F, of screw-threads B23G1/36; by electro-erosion B23H; abrasive or related blasting B24C; tools for grinding, buffing or sharpening B24D; polishing compositions C09G1/00; abrasives C09K3/14; electrolytic etching or polishing C25F3/00; grinding arrangements for use on assembled railway tracks E01B31/17); DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
Additional Content IPC
Glossary
Grinding Grinding means machining by fixed abrasive particles in its most general sense and covers "corrective" operations, such as correction of dimension, e.g. diameter, or shape, e.g. roundness. It is characterised by a comparatively high material removal rate. Polishing Polishing means abrading a work so as to improve, e.g. smoothen, its surface, without substantial change of dimension or shape of the work as would occur in grinding. Abrading Abrading is used in its most general sense to mean mechanically removing material by a multitude of fixed or loose particles that are forced into the surface of the work so that each particle cuts away small chips of material Honing Honing means abrading by means of one or more, often compliant, fine grit abrasive blocks or stones along a controlled path of combined movements, including a reciprocating movement, in order to smoothen a surface or to produce a defined surface texture such as a cross-hatch pattern. Superfinishing Superfinishing means abrading by means of one or more fine grit abrading blocks or an abrasive band pressed by a shoe (bandfinishing) along a controlled path of combined movements. Typically, the block or shoe is oscillated with a short stroke and relatively high frequency while the work is rotated, in order to improve surface finish or produce a defined surface texture such as a cross-hatch pattern. Superfinishing is also referred to as microfinishing, or short-stroke honing, in the art. Lapping Lapping is surface finishing by rubbing the surface of the work and the surface of a lapping tool, e.g. a lapping plate or lapping pad, that is mostly shaped corresponding to the work surface, against each other, mainly with loose abrasives rolling and sliding between the surfaces; the abrasives may be dispersed in a liquid medium, i.e. a slurry, or in a paste, or fixed to the lapping pad Burnishing Burnishing means plastically deforming a work on a small scale by means of rubbing or rolling a tool, e.g. a roller or ball, on the work. It is not an abrading operation but used as an alternative to abrasive finishing operations in order to improve the surface finish or surface hardness of the work. Conditioning Conditioning is used in its most general sense to mean truing by removing material from the abrasive tool to maintain tool geometry, e.g. concentricity, or to (re-) profile a form into the abrasive surface, sharpening by removing small amounts of binding material from the abrasive surface to expose abrasive grains or by breaking abrasive grains to produce sharper cutting edges on the grain, cleaning the surface of an abrasive tool or a lapping pad in order to remove debris from the space between the grains or pores of the pad. Dressing Dressing is used as a synonym for conditioning
Limiting references
Abrasive or related blasting with particulate material Working metal by electro-erosion, e.g. electrolytic grinding , Electrolytic etching or polishing
Application references
Grinding of gear teeth Grinding of screw threads , Grinding arrangements for use on assembled railway tracks
IPC and CPC are identically structured here. All 28 subcodes exist in both systems.
23 shared codes have differing titles between IPC and CPC.
Child Classifications
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- B24B 1/00 Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes +3 CPC IPC+CPC Available in IPC and CPC
- B24B 11/00 Machines or devices designed for grinding spherical surfaces or parts of spherical surfaces on work; Accessories therefor (specially designed for optical surfaces B24B13/00, for seat surfaces B24B15/00) IPC+CPC Available in IPC and CPC
- B24B 13/00 Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor (edging optical work, e.g. lenses, prisms B24B9/14) +6 CPC IPC+CPC Available in IPC and CPC
- B24B 15/00 Machines or devices designed for grinding seat surfaces; Accessories therefor (for spherical surfaces in general B24B11/00) IPC+CPC Available in IPC and CPC
- B24B 17/00 Special adaptations of machines or devices for grinding controlled by patterns, drawings, magnetic tapes or the like (machines or devices so-controlled for grinding the edges of lenses B24B9/14; for grinding or polishing optical lens surfaces B24B13/06; for grinding non-circular cross-sections B24B19/08; for grinding trochoidal surfaces B24B19/09; for grinding cams B24B19/12; for grinding turbine blades or the like B24B19/14; such control means per se B23Q33/00, B23Q35/00, G05); Accessories therefor IPC+CPC Available in IPC and CPC
- B24B 19/00 Single-purpose machines or devices for particular grinding operations not covered by any other main group (tapering, chamfering, or relief cutting of taps or reamers B24B3/20, B24B3/22, grinding screw threads B23G) +8 CPC IPC+CPC Available in IPC and CPC
- B24B 21/00 Machines or devices using grinding or polishing belts (for sharpening cutting edges of tools B24B3/00; portable belt-grinding machines B24B23/06); Accessories therefor +4 CPC IPC+CPC Available in IPC and CPC
- B24B 23/00 Portable grinding machines, e.g. hand-guided; Accessories therefor (B24B7/18 takes precedence; for grinding seat surfaces B24B15/00; having a flexible shaft B24B27/027; grinders for cutting-off B24B27/08; dust extraction equipment B24B55/10; details or components, e.g. casings, bodies of portable power-driven tools not particularly related to the operation performed B25F5/00) +1 CPC IPC+CPC Available in IPC and CPC
- B24B 29/00 Machines or devices for polishing surfaces on work by means of tools made of soft or flexible material with or without the application of solid or liquid polishing agents (polishing tools in general B24D13/00) +1 CPC IPC+CPC Available in IPC and CPC
- B24B 3/00 Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools (non-abrasive sharpening devices for scythes, sickles, or the like A01D3/00; sharpening devices designed as components of machines with cutters, see the relevant places for the machines, e.g. A01D75/08, B26D7/12; sharpening of saw teeth B23D63/12; sharpening of files or rasps B23D73/00; grinding of die-stocks or chasers B23G1/36) +2 CPC IPC+CPC Available in IPC and CPC
- B24B 31/00 Machines or devices designed for polishing or abrading surfaces on work by means of tumbling apparatus or other apparatus in which the work and/or the abrasive material is loose; Accessories therefor (abrasive blasting machines B24C3/26) +2 CPC IPC+CPC Available in IPC and CPC
- B24B 35/00 Machines or devices designed for superfinishing surfaces on work, i.e. by means of abrading blocks reciprocating with high frequency +1 CPC IPC+CPC Available in IPC and CPC
- B24B 37/00 Lapping machines or devices; Accessories (B24B3/00 takes precedence) IPC+CPC Available in IPC and CPC
- B24B 39/00 Burnishing machines or devices, i.e. requiring pressure members for compacting the surface zone (modifying the physical properties or structure of metal by burnishing C21D7/08, C22F1/00); Accessories therefor +2 CPC IPC+CPC Available in IPC and CPC
- B24B 41/00 Component parts such as frames, beds, carriages, headstocks +3 CPC IPC+CPC Available in IPC and CPC
- B24B 45/00 Means for securing grinding wheels on rotary arbors (suppression of vibrations in systems F16F15/00; testing static or dynamic balancing of machines G01M1/00) +2 CPC IPC+CPC Available in IPC and CPC
Top Applicants
Top Applicants (IPC)
Class B24,2013–2023, worldwide · Source: EPO PATSTAT
- DISCO ABRASIVE SYSTEM 3,084
- APPLIED MATERIALS US 1,570
- EBARA CORPORATION JP 1,393
- DISCO CORPORATION JP 1,368
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 1,270
- EBARA CORPORATION 1,016
- FUJIMI JP 829
- ZHEJIANG UNIVERSITY OF TECHNOLOGY 804
- ROBERT BOSCH DE 803
- SAINT-GOBAIN ABRASIVES US 781
Top Applicants (CPC)
Class B24,2013–2023, worldwide · Source: EPO PATSTAT
- DISCO CORPORATION JP 2,092
- APPLIED MATERIALS US 1,813
- EBARA CORPORATION JP 1,804
- 3M INNOVATIVE PROPERTIES COMPANY (MINNESOTA MINING AND MANUFACTURING INNOVATIVE PROPERTIES COMPANY) US 1,329
- ROBERT BOSCH DE 863
- FUJIMI JP 858
- SAINT-GOBAIN ABRASIVES US 833
- EBARA CORPORATION 810
- SAINT-GOBAIN ABRASIVES FR 782
- DISCO ABRASIVE SYSTEM 735