Method for making high permeability grinding wheels
AssigneeNorton Company
InventorMianxue Wu
Life of this patent
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Abstract
An efficient method for manufacturing bonded abrasive articles comprises the use of elongated abrasive grain having a length to cross-sectional width aspect ratio of at least 5:1 to yield abrasive articles which are highly permeable to the passage of fluids. A method for measuring permeability is provided. The abrasive articles are used to carry out soft grinding and deep cut grinding operations. The permeable abrasive articles provide an open structure of pores and channels permitting the passage of fluid through the abrasive article and the removal of swarf from the workpiece during grinding operations.
Claims28
A method for making an abrasive article, comprising abrasive grain and bond in amounts effective for grinding;
- comprising the steps
- a) blending a mixture comprising abrasive grain consisting of a major amount of elongated abrasive grain having a length to cross-sectional width aspect ratio of at least 5:1 and vitrified bond to form an abrasive mix;
- b) pressing the abrasive mix in a mold to form a green abrasive article having about 55% to about 80%, by volume, porosity;
- and
- c) firing the green abrasive article at 600.degree. to 1300.degree. C. for a firing time and under firing conditions effective to cure the green abrasive article and form the abrasive article,
- whereby relative to a firing time effective to cure an equivalent green abrasive article which does not contain the elongated abrasive grain under the firing conditions of step c), the firing time effective to cure the green abrasive article is reduced by at least one-half, and whereby the abrasive article has sufficient interconnected porosity to yield an air permeability capacity, measured in cc air/second/inch of water, of at least 0.44 times the cross-sectional width of the abrasive grain.
A method for making an abrasive article, comprising abrasive grain and bond in amounts effective for grinding;
- comprising the steps
- a) blending a mixture comprising abrasive grain consisting of a major amount of elongated abrasive grain having a length to cross-sectional width aspect ratio of at least 5:1 and vitrified bond to form an abrasive mix;
- b) pressing the abrasive mix in a mold to form a green abrasive article having about 40% to less than 55%, by volume, porosity;
- and
- c) firing the green abrasive article at 600.degree. to 1300.degree. C. for a firing time and under firing conditions effective to cure the green abrasive article and form the abrasive article,
- whereby relative to a firing time effective to cure an equivalent green abrasive article which does not contain the elongated abrasive grain under the firing conditions of step c), the firing time effective to cure the green abrasive article is reduced by at least one-half, and whereby the abrasive article has sufficient interconnected porosity to yield an air permeability capacity, measured in cc air/second/inch of water, of at least 0.22 times the cross-sectional width of the abrasive grain.
Dependencies are inferred from the claim text.