Grinding wheel assembly

Abstract

An abrasive article comprises an abrasive portion having an annular shape defined by an inner annular surface, the abrasive portion including abrasive particles contained in a bond material, and wherein the abrasive portion comprises at least one circumferential groove in an outer annular surface; and a backing coupled to the inner annular surface of the abrasive portion.

What is claimed is: 
     
         1 . An abrasive article comprising:
 a body including:
 an abrasive portion having an annular shape defined by an inner annular surface, the abrasive portion including abrasive particles contained in a bond material, and wherein the abrasive portion comprises at least one groove in an outer annular surface; and 
 a backing coupled to the inner annular surface of the abrasive portion, wherein the backing comprises a first radial surface, second radial surface opposite the first radial surface, and an inner annular surface extending between the first radial surface and second radial surface, and wherein the first radial surface, second radial surface or inner annular surface comprises an average surface roughness (Ra) of at least 0.1 microns. 
   
     
     
         2 . The abrasive article of  claim 1 , wherein the backing comprises a radial width (Rb) that is at least 0.1% greater than a radial width of the abrasive portion (Rwa). 
     
     
         3 . The abrasive article of  claim 2 , wherein Rb is less than 200% greater than Rwa. 
     
     
         4 . The abrasive article of  claim 1 , wherein the backing comprises a first radial surface, second radial surface opposite the first radial surface, and an inner annular surface extending between the first radial surface and second radial surface, and wherein the first radial surface, second radial surface or inner annular surface comprises an average surface roughness (Ra) of no greater than 25 microns. 
     
     
         5 . The abrasive article of  claim 1 , wherein the first radial surface, second radial surface, and inner annular surface of the backing comprises an average surface roughness (Ra) of at least 0.1 microns. 
     
     
         6 . The abrasive article of  claim 1 , wherein the backing has a hardness of at least 76 HRB. 
     
     
         7 . The abrasive article of  claim 1 , wherein the backing comprises an axial thickness (Tb) of no greater than 1% greater than an axial thickness of the abrasive portion (Ta). 
     
     
         8 . The abrasive article of  claim 1 , wherein the backing comprises a material that is the same material as the bond material of the abrasive portion. 
     
     
         9 . The abrasive article of  claim 1 , wherein the backing does not comprise abrasive particles. 
     
     
         10 . The abrasive article of  claim 1 , wherein there is only one contact surface between the abrasive portion and the backing. 
     
     
         11 . The abrasive article of  claim 10 , wherein the contact surface is the inner annular surface of the abrasive portion and an outer annular surface of the backing. 
     
     
         12 . The abrasive article of  claim 1 , wherein the bond material of the abrasive portion comprises tungsten. 
     
     
         13 . The abrasive article of  claim 1 , wherein the backing comprises tungsten. 
     
     
         14 . The abrasive article of  claim 1 , wherein the abrasive portion comprises a coefficient of thermal expansion, CTEab, and the backing comprises a coefficient of thermal expansion, CTEb, wherein the difference between CTEab and CTEb is no greater than 1% of CTEab. 
     
     
         15 . The abrasive article of  claim 1 , wherein the abrasive article is configured to fit between a cover plate and a mounting plate such that at least 1% of the first radial surface of the abrasive portion is configured to contact the cover plate. 
     
     
         16 . The abrasive article of  claim 1 , wherein the abrasive article is configured to fit between a cover plate and a mounting plate such that no greater than 99% of the first radial surface is configured to contact the cover plate. 
     
     
         17 . The abrasive article of  claim 1 , wherein the abrasive article is configured to fit between a cover plate and a mounting plate such that at least 1% and no greater than 99% of the second radial surface of the abrasive portion is configured to contact the mounting plate. 
     
     
         18 . The abrasive article of  claim 1  wherein the abrasive article is configured to fit between a cover plate and a mounting plate and the cover plate has a hardness of at least 50 HRB no greater than 100 HRB. 
     
     
         19 . The abrasive article of  claim 1 , wherein the abrasive article is configured to fit between a cover plate and a mounting plate and the mounting plate has a hardness of at least 50 HRB and no greater than 100 HRB. 
     
     
         20 . The abrasive article of  claim 1 , wherein the backing comprises no more than 3 openings or holes extending axially or radially into the backing, or no more than 2 holes or openings, or no more than 1 hole or opening or no holes or openings.