Cryogenic Treatment Systems and Processes for Grinding Wheels and Bonded Abrasive Tools
First Claim
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1. A process to treat a bonded abrasive tool using a cycling chamber, the process comprising:
- (a) introducing a bonded abrasive tool into a cycling chamber, wherein the tool has a temperature of about ambient temperature;
(b) introducing at least one cryogenic material into the cycling chamber, wherein the internal temperature of the chamber can be controlled by adjusting the flow rate of the at least one cryogenic material;
(c) decreasing the temperature of the cycling chamber or bonded abrasive tool to about −
275 degrees Fahrenheit (F) at a rate of about −
1 degree F. per minute to about −
3 degrees F. per minute;
(d) increasing the temperature of the cycling chamber or bonded abrasive tool to about −
80 degrees F. at a rate of about 1 degree F. per minute to about 3 degrees F. per minute;
(e) repeating elements (c) and (d) at least twice;
(f) further increasing the temperature of the cycling chamber or bonded abrasive tool to about 225 degrees F. at a rate of about 1 degrees F. to about 3 degrees F.; and
(g) maintaining the temperature of the cycling chamber or bonded abrasive tool at about 225 degrees F. for about 240 minutes before reducing the temperature of the cycling chamber or the bonded abrasive tool to about ambient temperature, and resulting in a strengthened and toughened bonded abrasive tool.
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Abstract
Embodiments of the invention can provide systems and methods for treating grinding wheels and bonded abrasive tools. A process in accordance with an embodiment of this invention is a cryogenic thermal cycling process for grinding wheels and bonded abrasive tools. Grinding wheels and bonded abrasive tools treated by cryogenic thermal cycling processes in accordance with embodiments of this invention can exhibit improved performance and service life during comparison testing against untreated tools.
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Citations
14 Claims
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1. A process to treat a bonded abrasive tool using a cycling chamber, the process comprising:
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(a) introducing a bonded abrasive tool into a cycling chamber, wherein the tool has a temperature of about ambient temperature; (b) introducing at least one cryogenic material into the cycling chamber, wherein the internal temperature of the chamber can be controlled by adjusting the flow rate of the at least one cryogenic material; (c) decreasing the temperature of the cycling chamber or bonded abrasive tool to about −
275 degrees Fahrenheit (F) at a rate of about −
1 degree F. per minute to about −
3 degrees F. per minute;(d) increasing the temperature of the cycling chamber or bonded abrasive tool to about −
80 degrees F. at a rate of about 1 degree F. per minute to about 3 degrees F. per minute;(e) repeating elements (c) and (d) at least twice; (f) further increasing the temperature of the cycling chamber or bonded abrasive tool to about 225 degrees F. at a rate of about 1 degrees F. to about 3 degrees F.; and (g) maintaining the temperature of the cycling chamber or bonded abrasive tool at about 225 degrees F. for about 240 minutes before reducing the temperature of the cycling chamber or the bonded abrasive tool to about ambient temperature, and resulting in a strengthened and toughened bonded abrasive tool. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A bonded abrasive tool comprising:
at least one abrasive material selected from the group that comprises at least one of alumina, zirconia, or alumina-zirconia;
wherein the bonded abrasive tool is formed by a process comprising;(a) introducing the bonded abrasive tool into a cycling chamber, wherein the tool has a temperature of about ambient temperature; (b) introducing at least one cryogenic material into the cycling chamber, wherein the internal temperature of the chamber can be controlled by adjusting the flow rate of the at least one cryogenic material; (c) decreasing the temperature of the cycling chamber or bonded abrasive tool to about −
275 degrees Fahrenheit (F) at a rate of about −
1 degree F. per minute to about −
3 degrees F. per minute;(d) increasing the temperature of the cycling chamber or bonded abrasive tool to about −
80 degrees F. at a rate of about 1 degree F. per minute to about 3 degrees F. per minute;(e) repeating elements (c) and (d) at least twice; (f) further increasing the temperature of the cycling chamber or bonded abrasive tool to about 225 degrees F. at a rate of about 1 degrees F. to about 3 degrees F.; and (g) maintaining the temperature of the cycling chamber or bonded abrasive tool at about 225 degrees F. for about 240 minutes, and resulting in a strengthened and toughened bonded abrasive tool. - View Dependent Claims (9, 10, 11, 12, 13, 14)
Specification