# US 8,540,795 B2 · Rotary cutter knife > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,540,795 B2 - Document ID: US8540795B2 - Status: Granted - Kind: B2 - Application number: 12/640,965 - Filed: 2009-12-17 - Published: 2010-06-24 - Granted: 2013-09-24 - Earliest claimed: 2008-12-18 - Assignees: Sandvik Intellectual Property AB - Applicants: Michael Carpenter; Bart De Bruyne; Daniel Tartavez; Jean Parjat - Inventors: Michael Carpenter; Bart De Bruyne; Daniel Tartavez; Jean Parjat - Web page: https://patentgrep.com/patent/US8540795B2 ## CPC - B26F 1/384: {using rotating drums} - B26D 1/0006: {Cutting members therefor} - B26D 1/405: {for thin material, e.g. for sheets, strips or the like} - B26D 1/626: {for thin material, e.g. for sheets, strips or the like} - C22C 29/08: based on tungsten carbide - B22F 2005/001: {Cutting tools, earth boring or grinding tool other than table ware} - B26D 2001/002: {Materials or surface treatments therefor, e.g. composite materials} - Y10T 83/04: Processes - Y10T 83/9372: Rotatable type - B26F: PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING (marking-out, perforating or making buttonholes A41H25/00; shoemaking A43D; surgery A61B; punching metal B21D; drilling metal B23B; cutting of metal by applying heat locally, e.g. flame cutting, B23K; cutting by abrasive fluid jets B24C5/02; details common to machines for severing B26D; drilling wood B27C; drilling stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; of glass C03B; of leather C14B; of textile materials D06H; for light guides G02B6/25; of tickets G07B) - B26D: CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING (for growing crops or plants A01D, A01G; for fodder or straw A01F; for bulk butter A01J; for dough A21C; slaughtering A22B; for tobacco, cigars or cigarettes A24; marking-out, perforating or making buttonholes A41H25/00; manufacturing footwear A43D; brushmaking A46D; surgery A61B; disintegrating, mincing or shredding in general B02C; cutting wire, making pins or nails B21F, B21G; of the kind used formetal B23; cutting by abrasive fluid jets B24C5/02; hand-held cutting tools B26B; perforating, cutting-out, stamping-out or punching, or severing by means other than cutting B26F; for wood B27; for stone B28D; working of plastics or substances in a plastic state B29; making boxes, cartons, envelopes or bags, of paper or similarly worked materials, e.g. metal foil, B31B; article or web delivery apparatus incorporating cutting or line-perforating devices B65H35/00; for leather or upholstery B68, C14B; for glass C03B; making matches C06F; for peat C10F; for sugar C13B45/00; for textile materials D06H; civil engineering, building, mining, see Section E; for light guides G02B6/25; cutting processed photographic material G03D15/04) - C22C: ALLOYS (treatment of alloys C21D, C22F) - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract The present invention relates to a rotary cutter knife of a cemented carbide comprising a hard phase comprising WC and a binder phase wherein the cemented carbide comprises, in wt-%, from about 7 to about 12 Co+Ni, with a weight ratio Co/Ni of from about 0 to about 4, from about 0.5 to about 3 Cr and from about 0.1 to about 0.3 Mo. ## Claims ### Claim 1 A rotary cutter knife of a cemented carbide comprising a hard phase comprising WC and a binder phase, wherein the cemented carbide has a composition, in wt-%, from about 6 to about 8 Co, from about 2 to about 3 Ni, from about 0.8 to about 2 Cr, and from about 0.1 to about 0.3 Mo, with balance of WC. ### Claim 2 A rotary cutter knife of a cemented carbide comprising a hard phase comprising WC and a binder phase, wherein the cemented carbide has a composition, in wt-%, from about 3 to about 4 Co, from about 6 to about 8 Ni, from about 1 to about 1.5 Cr, and from about 0.1 to about 0.3 Mo, with balance of WC. ### Claim 3 A rotary cutter knife of a cemented carbide comprising a hard phase comprising WC and a binder phase, wherein the cemented carbide comprises, in wt-%, from about 7 to about 12 Co+Ni, with a weight ratio Co/Ni of from about 0 to about 4, from about 0.5 to about 3 Cr and from about 0.1 to about 0.3 Mo, and wherein essentially all WC grains have a size less than about 1 μm. ### Claim 4 (depends on 3) A rotary cutter knife according to claim 3 wherein the cemented carbide comprises, in wt-%, from about 8 to about 12 Co+Ni, and from about 0.5 to about 2 Cr. ### Claim 5 (depends on 3) A rotary cutter knife according to claim 3 wherein the cemented carbide has a composition, in wt-%, from about 7 to about 10 Ni, from about 0.5 to about 2 Cr, and from about 0.1 to about 0.3 Mo, with balance of WC. ### Claim 6 (depends on 5) A rotary cutter knife according to claim 5 wherein the cemented carbide comprises, in wt-%, from about 8 to about 10 Ni. ### Claim 7 (depends on 3) A rotary cutter knife according to claim 3 wherein the weight ratio Co/Ni is from about 0.25 to about 4. ### Claim 8 (depends on 3) A rotary cutter knife according to claim 3 wherein the weight ratio Co/Ni is from about 0 to less than about 0.25. ### Claim 9 (depends on 1) A rotary cutter knife according to claim 1 wherein the binder phase contains between about 7 and about 14 wt-% Cr+Mo. ### Claim 10 (depends on 9) A rotary cutter knife according to claim 9 wherein the binder phase contains between about 8 and about 14 wt-% Cr+Mo. ### Claim 11 (depends on 1) A rotary cutter knife according to claim 1 wherein a total carbon content, in wt-%, in the cemented carbide is about 6.13−(0.05±0.01)×y, wherein y is the Co+Ni content in wt-%. ### Claim 12 (depends on 1) A rotary cutter knife according to claim 1 wherein the average WC grain size is less than 1 μm. ### Claim 13 (depends on 2) A rotary cutter knife according to claim 2 wherein the binder phase contains between about 7 and about 14 wt-% Cr+Mo. ### Claim 14 (depends on 13) A rotary cutter knife according to claim 13 wherein the binder phase contains between about 8 and about 14 wt-% Cr+Mo. ### Claim 15 (depends on 2) A rotary cutter knife according to claim 2 wherein a total carbon content, in wt-%, in the cemented carbide is about 6.13−(0.05±0.01)×y, wherein y is the Co+Ni content in wt-%. ### Claim 16 (depends on 2) A rotary cutter knife according to claim 2 wherein the average WC grain size is less than 1 μm. ### Claim 17 (depends on 3) A rotary cutter knife according to claim 3 wherein a total carbon content, in wt-%, in the cemented carbide is about 6.13−(0.05±0.01)×y, wherein y is the Co+Ni content in wt-%. ### Claim 18 (depends on 3) A rotary cutter knife according to claim 3 wherein the binder phase contains between about 7 and about 14 wt-% Cr+Mo. ### Claim 19 (depends on 18) A rotary cutter knife according to claim 18 wherein the binder phase contains between about 8 and about 14 wt-% Cr+Mo. ### Claim 20 (depends on 1) A method of cutting composite materials, the method comprising: supplying a composite material to a rotary cutter; and cutting the composite material with the rotary cutter, wherein the rotary cutter includes a rotary cutter knife according to claim 1, and wherein cutting of the composite material forms a corrosive-abrasive environment between the cutter knife edge and an anvil of the rotary cutter. ### Claim 21 (depends on 2) A method of cutting composite materials, the method comprising: supplying a composite material to a rotary cutter; and cutting the composite material with the rotary cutter, wherein the rotary cutter includes a rotary cutter knife according to claim 2, and wherein cutting of the composite material forms a corrosive-abrasive environment between the cutter knife edge and an anvil of the rotary cutter. ### Claim 22 (depends on 3) A method of cutting composite materials, the method comprising: supplying a composite material to a rotary cutter; and cutting the composite material with the rotary cutter, wherein the rotary cutter includes a rotary cutter knife according to claim 3, and wherein cutting of the composite material forms a corrosive-abrasive environment between the cutter knife edge and an anvil of the rotary cutter.