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Cryogenic Treatment Systems and Processes for Grinding Wheels and Bonded Abrasive Tools

  • US 20090260298A1
  • Filed: 04/16/2009
  • Published: 10/22/2009
  • Est. Priority Date: 04/16/2008
  • Status: Abandoned Application
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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