IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0252672
(2011-10-04)
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등록번호 |
US-8726778
(2014-05-20)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Sutherland Asbill & Brennan LLP
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인용정보 |
피인용 횟수 :
0 인용 특허 :
24 |
초록
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This disclosure generally relates to high-volume and cost-effective methods for producing non-spherical metal particles, particularly methods for producing metal cubes having rounded edges. The metal cubes having rounded edges are useful as ballistic shot in shotshell loads for hunting, where the pa
This disclosure generally relates to high-volume and cost-effective methods for producing non-spherical metal particles, particularly methods for producing metal cubes having rounded edges. The metal cubes having rounded edges are useful as ballistic shot in shotshell loads for hunting, where the particle shape imparted by the disclosed process packs to a higher density than spherical shot in the same volume.
대표청구항
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1. A process for making symmetrical non-spherical shot, comprising: a. providing a metal wire having a non-circular cross section;b. serially cutting the metal wire into rough shot;c. applying a radius to the rough shot to provide radiused shot with edges having a selected radius of curvature, the r
1. A process for making symmetrical non-spherical shot, comprising: a. providing a metal wire having a non-circular cross section;b. serially cutting the metal wire into rough shot;c. applying a radius to the rough shot to provide radiused shot with edges having a selected radius of curvature, the radiused shot having a burr or flash; andd. finishing the radiused shot by energetically contacting the radiused shot with a finishing medium to remove the burr or flash and provide finished symmetrical non-spherical shot. 2. A process according to claim 1, wherein the cross section of the metal wire is a square or a square with rounded edges. 3. A process according to claim 1, wherein the cross section of the metal wire is a polygon or polygon with rounded edges. 4. A process according to claim 1, wherein the step of applying a radius to the rough shot is carried out by grinding or by abrasive blasting. 5. A process according to claim 1, wherein the finishing step is carried out by centrifugal disk finishing. 6. A process according to claim 1, wherein the finishing medium is selected from a ceramic material. 7. A process according to claim 1, wherein the finishing medium is a ceramic prism having two angle cut triangle faces and three quadrilateral faces, wherein the aspect ratio (a:b) of the largest triangle face height (a) to the largest quadrilateral face height (b) is 2.0±0.8. 8. A process according to claim 1, wherein the finishing medium is a ceramic prism having two angle cut triangle faces and three quadrilateral faces, wherein the aspect ratio (a:b) of the largest triangle face height (a) to the largest quadrilateral face height (b) is 1±0.3. 9. A process according to claim 1, wherein the finishing medium is a Rösler Metal Finishing ceramic medium selected from an RX, RSG, RAH, and RXX medium, or any combination thereof. 10. A process according to claim 1, wherein the finishing medium comprises Rösler Metal Finishing ceramic medium, part number RXX/LD 22/10 S-LT or RX 10/10 S. 11. A process according to claim 1, wherein the finishing step further energetically contacts the radiused shot and the finishing medium with a cleaning compound. 12. A process according to claim 1, wherein the finishing step is carried out by centrifugal disk finishing, the finishing medium is a ceramic material, and the cross section of the metal wire is a square with rounded edges. 13. A process according to claim 1, wherein the finishing medium is a ceramic material and the finishing step is carried out by centrifugal disk finishing at a disk speed of from 100 rpm to 145 rpm for 2-20 hours, or using ±25% of the equivalent number of revolutions. 14. A process according to claim 1, wherein the finishing step is carried out by centrifugal disk finishing using a radiused shot-to-finishing medium weight ratio of 1:2 to 1:3. 15. A process according to claim 1, wherein the metal wire has a 1 mm to 5 mm square cross section. 16. A process according to claim 1, wherein the metal wire has a 2.5 mm to 4 mm square cross section and a 0.7 to 1.5 mm radius of curvature. 17. A process according to claim 1, wherein the metal wire has a radius of curvature (x)-to-square cross section (y) ratio x:y from 1:2.5 to 1:3.5. 18. A process according to claim 1, wherein the metal wire is steel wire having less than or equal to 0.30 weight % carbon, less than or equal to 1.65 weight % manganese, less than or equal to 0.60 weight % silicon, less than or equal to 0.60 weight copper, or any combination thereof. 19. A process according to claim 1, wherein the metal wire is steel wire having less than 0.20 weight % carbon. 20. A process according to claim 1, wherein the step of applying a radius to the rough shot is carried out by grinding using from 1 to 15 passes through a Steel Ball Processing Machine operating at a low machining pressure and at 60-100 rpm. 21. A process according to claim 1, wherein the metal wire is drawn through a die or draw plate having a square cross section with rounded edges. 22. A process for making symmetrical non-spherical shot, comprising: a. extruding or drawing a metal wire through a die having a non-circular cross section to provide a metal wire having a non-circular cross section;b. serially cutting the metal wire into rough shot;c. grinding the rough shot to provide radiused shot with edges having a selected radius of curvature;d. finishing the radiused shot by energetically contacting the radiused shot with a finishing medium and optionally a cleaning compound to provide finished non-spherical shot;e. optionally, annealing the finished non-spherical shot; andf. optionally, polishing the annealed finished non-spherical shot. 23. A process according to claim 22, wherein the annealing step is carried out at a temperature from 680 to 815° C., over a time period of 0.5 to 2.5 hours. 24. A process according to claim 22, wherein the polishing step is carried out using a vibrating bowl finishing machine from about 10 to about 30 minutes. 25. A process for making metal shot with rounded edges, the process comprising: a. providing a metal wire having a square cross section or a square cross section with rounded edges;b. serially cutting the metal wire into rough shot;c. grinding the rough shot to provide radiused shot with edges having a selected radius of curvature; andd. finishing the radiused shot by energetically contacting the radiused shot with a finishing medium to provide finished metal shot with rounded edges. 26. A process according to claim 25, further comprising annealing the finished metal shot. 27. A process according to claim 26, further comprising polishing the annealed finished metal shot. 28. A process according to claim 25, wherein the finishing medium comprises Rösler Metal Finishing ceramic medium, part number RXX/LD 22/10 S-LT or RX 10/10 S. 29. A process according to claim 25, wherein the finishing step comprises energetically contacting the radiused shot with Rösler Metal Finishing RX 10/10 S ceramic medium and Rösler ZF 113 cleaning compound. 30. A process according to claim 25, wherein the grinding step is carried out using from 1 to 10 passes through a Steel Ball Processing Machine operating at a low machining pressure and at 70-90 rpm.
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