# US 9,775,296 B2 · Agricultural concave having a component coated with a high hardness material > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,775,296 B2 - Document ID: US9775296B2 - Status: Granted - Kind: B2 - Application number: 14/730,483 - Filed: 2015-06-04 - Published: 2016-12-08 - Granted: 2017-10-03 - Earliest claimed: 2015-06-04 - Assignees: CNH Industrial America LLC - Applicants: CNH Industrial America LLC - Inventors: Thomas P. Haus; Benjamin Kemmerer; Wayne Flickinger - Web page: https://patentgrep.com/patent/US9775296B2 ## CPC - A01F 12/24: One-part threshing concaves - A01F 12/16: Safety devices - A01F 12/26: Multi-part threshing concaves - C21D 1/18: Hardening (C21D1/02 takes precedence); Quenching with or without subsequent tempering (quenching devices C21D1/62) - C23C 4/10: Oxides, borides, carbides, nitrides or silicides; Mixtures thereof - A01F: PROCESSING OF HARVESTED PRODUCE; HAY OR STRAW PRESSES; DEVICES FOR STORING AGRICULTURAL OR HORTICULTURAL PRODUCE (devices for topping or skinning onions or flower bulbs A23N15/08) - 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) ## Abstract An agricultural harvester includes a chassis and a threshing and separating section carried by the chassis that is configured for threshing and separating grain from gathered crop material. The threshing and separating section includes at least one concave with at least one crop engaging surface having a high hardness coating formed thereon. ## Claims ### Claim 1 An agricultural harvester, comprising: a chassis; and a threshing and separating section carried by said chassis and configured for threshing and separating grain from gathered crop material, said threshing and separating section including a rotor and at least one concave at least partially enclosing said rotor and having a rub bar with at least one crop engaging surface facing said rotor, said rub bar including a first region with a first hardness and a second region which includes said at least one crop engaging surface and has a second hardness, said at least one crop engaging surface having a high hardness coating formed thereon, said second hardness of said second region being greater than said first hardness of said first region and less than a coating hardness of said high hardness coating formed on said at least one crop engaging surface. ### Claim 2 (depends on 1) The agricultural harvester according to claim 1, wherein said coating hardness is greater than 55 Rockwell C Scale Hardness (HRC). ### Claim 3 (depends on 2) The agricultural harvester according to claim 2, wherein said coating hardness is at least 65 HRC. ### Claim 4 (depends on 1) The agricultural harvester according to claim 1, wherein said high hardness coating comprises tungsten carbide. ### Claim 5 (depends on 4) The agricultural harvester according to claim 4, wherein said high hardness coating comprises a metal matrix composite including a tungsten carbide aggregate and a nickel-chrome matrix. ### Claim 6 (depends on 1) The agricultural harvester according to claim 1, wherein said first portion is an unhardened region and said second portion is a hardened region. ### Claim 7 A concave for an agricultural harvester defined about a central axis, comprising: at least one rub bar having at least one opening formed therethrough; at least one wire held in said at least one opening formed in said at least one rub bar; and a high hardness coating formed on a surface of a second portion of at least one of said at least one rub bar and said at least one wire, said second portion being connected to a first portion, said second portion having a second hardness which is greater than a first hardness of said first portion and less than a coating hardness of said high hardness coating formed on said surface of said second portion, said surface of said second portion facing said central axis of said concave. ### Claim 8 (depends on 7) The concave according to claim 7, wherein said coating hardness is greater than 55 Rockwell C Scale Hardness (HRC). ### Claim 9 (depends on 8) The concave according to claim 8, wherein said coating hardness is at least 65 HRC. ### Claim 10 (depends on 7) The concave according to claim 7, wherein said high hardness coating comprises tungsten carbide. ### Claim 11 (depends on 10) The concave according to claim 10, wherein said high hardness coating comprises a metal matrix composite including a tungsten carbide aggregate and a nickel-chrome matrix. ### Claim 12 (depends on 7) The concave according to claim 7, wherein said high hardness coating is formed on a crop engaging surface of said at least one rub bar. ### Claim 13 (depends on 12) The concave according to claim 12, wherein said first portion is an unhardened region and said second portion is a hardened region.