Bonded abrasive articles filled with oil/wax mixture
First Claim
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1. An abrasive article for precision grinding, comprising 3 to 25 volume % vitreous bond, 3 to 56 volume % MCA abrasive grain, and 28 to 63 volume % open porosity, wherein substantially all open porosity in the abrasive article has been impregnated with a lubricant component consisting of a uniform mixture of oil and wax, having an oil:
- wax weight ratio of about 3;
1 to about 1;
4.
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Abstract
An abrasive article is provided for precision grinding purposes, and the article comprises 3 to 25 volume % vitreous bond, 3 to 56 volume % MCA abrasive grain, and 28 to 63 volume % open porosity. Substantially all porosity in the abrasive article is impregnated with a lubricant component consisting of an oil and wax mixture having an oil:wax weight ratio of about 3:1 to about 1:4.
73 Citations
18 Claims
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1. An abrasive article for precision grinding, comprising 3 to 25 volume % vitreous bond, 3 to 56 volume % MCA abrasive grain, and 28 to 63 volume % open porosity, wherein substantially all open porosity in the abrasive article has been impregnated with a lubricant component consisting of a uniform mixture of oil and wax, having an oil:
- wax weight ratio of about 3;
1 to about 1;
4. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
- wax weight ratio of about 3;
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12. A method of manufacturing an abrasive article for precision grinding comprising the steps of:
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(a) blending about 20-75 wt % oil and 25-80 wt % wax at a temperature above the softening point of the wax to form a uniformly mixed lubricant component; (b) providing an abrasive article comprising about 3 to 25 volume % vitreous bond, 3 to 56 volume % MCA grain and 28 to 63 volume % open pores; (c) heating the lubricant component to a temperature where the lubricant component is in a liquid state and holding the lubricant component in a liquid state; (d) heating the abrasive article to a temperature 20 to 30°
C. higher the temperature of the liquid lubricant component;(e) contacting the abrasive article with the liquid lubricant component without submerging the abrasive article into the liquid lubricant component; (f) rotating the abrasive article at a speed effective to avoid gas entrainment while maintaining contact with the liquid lubricant component to uniformly impregnate the abrasive article with lubricant component; (g) removing the abrasive article from contact with the lubricant component after the abrasive article has absorbed an effective amount of lubricant component to fill substantially all open pores; and (h) continuing to rotate the abrasive article while cooling the abrasive article to uniformly solidify the impregnated liquid lubricant component within the pores. - View Dependent Claims (13)
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14. A method of precision grinding comprising the steps of:
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(a) providing an abrasive article comprising a vitreous bond and a MCA abrasive grain having pores containing a lubricant component consisting essentially of about 20-75 wt % oil and 25-80 wt % wax;
wherein the oil includes a sulfurized cutting oil additive; and(b) while continuously bathing a surface of a metal work piece in a sulfur-free, liquid coolant, placing the abrasive article in moving abrasive contact with the work piece until the surface attains a precision ground finish. - View Dependent Claims (15)
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16. A method of dry precision grinding including the steps of:
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(a) providing an abrasive article, comprising 3 to 25 volume % vitreous bond, 3 to 56 volume % MCA abrasive grain, and 28 to 63 volume % open porosity, wherein substantially all open porosity in the abrasive article is impregnated with a lubricant component consisting of a uniform mixture of oil and wax, having an oil;
wax weight ratio of about 3;
1 to about 1;
4;(b) placing the abrasive article in moving abrasive contact with a surface of a dry workpiece until the surface attains a precision ground finish; whereby the surface of the workpiece is substantially free of thermal damage. - View Dependent Claims (17, 18)
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Specification