# US 2016/0354850 A1 · Method of manufacturing gear-cutting tools

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- Number: US 2016/0354850 A1
- Document ID: US20160354850A1
- Status: Published application
- Kind: A1
- Application number: 14/730,317
- Filed: 2015-06-04
- Published: 2016-12-08
- Earliest claimed: 2015-06-04
- Assignees: Caterpillar Inc.
- Applicants: Caterpillar Inc.
- Inventors: GABRIEL J. ELLICOTT; Richard G. Marsh; Scott A. Johnston
- Web page: https://patentgrep.com/patent/US20160354850A1

## CPC

- B23F 21/16: Hobs
- C21D 1/06: Surface hardening
- C21D 9/22: for drills; for milling cutters; for machine cutting tools
- C23C 4/10: Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
- C23C 4/18: After-treatment
- C25D 7/00: Electroplating characterised by the article coated
- C25D 9/04: with inorganic materials
- B23F: MAKING GEARS OR TOOTHED RACKS (by stamping B21D; by rolling B21H; by forging or pressing B21K; by casting B22; arrangements for copying or controlling B23Q; machines or devices for grinding or polishing, in general B24B)
- C21D: MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING (surface treatment of metallic material involving at least one process provided for in class C23 and at least one process covered by this subclass C23F17/00; unidirectional solidification of eutectic materials or unidirectional demixing of eutectoid materials C30B)
- C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04)
- C25D: PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR

## Abstract

A method of manufacturing a gear-cutting tool is disclosed. The gear-cutting tool includes a base portion and cutter teeth extended from the base portion. Each cutter tooth includes a cutting tip portion. The method initiates with hardening the gear-cutting tool with a first hardening process. Thereafter, coating the cutter teeth with a wear resistant material and then hardening the cutting tip portion of each of the cutter teeth with a second hardening process. In the second hardening process, the heat treat is directed to penetrate through the wear resistant material. This process imparts the heat treatment to the wear resistant material and the cutting tip portion of the cutter teeth of the gear-cutting tool.

## Claims

### Claim 1

A method of manufacturing a gear-cutting tool, the gear-cutting tool having a base portion and a plurality of cutter teeth extended from the base portion, each cutter tooth of the plurality of cutter teeth having a cutting tip portion, the method comprising:
hardening the gear-cutting tool with a first hardening process;
coating the plurality of cutter teeth of the gear-cutting tool with a wear resistant material;
hardening the cutting tip portion of each of the plurality of cutter teeth with a second hardening process, wherein the second hardening process including:
directing the heat treat of the second hardening process to penetrate the wear resistant material to impart the heat treatment to the wear resistant material and the cutting tip portion of the plurality of cutter teeth of the gear-cutting tool.