Rotary cutter knife
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.
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.
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.
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.
4. 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.
5. 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.
6. A rotary cutter knife according to claim 5 wherein the cemented carbide comprises, in wt-%, from about 8 to about 10 Ni.
7. A rotary cutter knife according to claim 3 wherein the weight ratio Co/Ni is from about 0.25 to about 4.
8. A rotary cutter knife according to claim 3 wherein the weight ratio Co/Ni is from about 0 to less than about 0.25.
9. A rotary cutter knife according to claim 1 wherein the binder phase contains between about 7 and about 14 wt-% Cr+Mo.
10. A rotary cutter knife according to claim 9 wherein the binder phase contains between about 8 and about 14 wt-% Cr+Mo.
11. 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-%.
12. A rotary cutter knife according to claim 1 wherein the average WC grain size is less than 1 μm.
13. A rotary cutter knife according to claim 2 wherein the binder phase contains between about 7 and about 14 wt-% Cr+Mo.
14. A rotary cutter knife according to claim 13 wherein the binder phase contains between about 8 and about 14 wt-% Cr+Mo.
15. 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-%.
16. A rotary cutter knife according to claim 2 wherein the average WC grain size is less than 1 μm.
17. 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-%.
18. A rotary cutter knife according to claim 3 wherein the binder phase contains between about 7 and about 14 wt-% Cr+Mo.
19. A rotary cutter knife according to claim 18 wherein the binder phase contains between about 8 and about 14 wt-% Cr+Mo.
20. 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.
21. 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.
22. 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.