Grinding wheel assembly

Abstract

An abrasive article is disclosed and can include a core comprising a polymer material. The core can include an upper surface, an outer peripheral surface, an upper recessed portion extending into the core from the upper surface and a peripheral recess extending into the outer peripheral surface. The abrasive article can also include a bonded abrasive body disposed within the peripheral recess of the outer peripheral surface of the core and a cover plate having an upper surface. The cover plate can fit into the upper recessed portion of the upper surface the core so that the upper surface of the cover plate is substantially coplanar with the upper surface of the core.

What is claimed is: 
     
         1 . An abrasive article, comprising:
 a core comprising a polymer material, the core having an upper surface, an outer peripheral surface, an upper recessed portion extending into the core from the upper surface and a peripheral recess extending into the outer peripheral surface;   a bonded abrasive body disposed within the peripheral recess of the outer peripheral surface of the core; and   a cover plate having an upper surface, wherein the cover plate fits into the upper recessed portion of the upper surface the core so that the upper surface of the cover plate is substantially coplanar with the upper surface of the core.   
     
     
         2 . The abrasive article of  claim 1 , wherein the core further comprises a central bore and the cover plate extends at least partially into the central bore. 
     
     
         3 . The abrasive article of  claim 2 , wherein the bore has a depth, D B , and the cover plate extends into the bore at a depth, D E , and D E  is less than or equal to 50% D B . 
     
     
         4 . The abrasive article of  claim 3 , wherein D E  is greater than or equal to 2.5% D B , such as greater than or equal to 5% D B , greater than or equal to 7.5% D B , or greater than or equal to 10% D B . 
     
     
         5 . The abrasive article of  claim 1 , wherein the recessed portion has a radial width, W RP , and the core has a radial width, W C , and W RP  is greater than or equal to 40% W C . 
     
     
         6 . The abrasive article of  claim 5 , wherein W RP  is less than or equal to 75% W C , such as less than or equal to 70% W C , less than or equal to 65% W C , or less than or equal to 60% W C . 
     
     
         7 . The abrasive article of  claim 1 , wherein the recessed portion has a radial width, W RP , and the cover plate has a diameter, D CP , and W RP  is greater than or equal to 10% D CP . 
     
     
         8 . The abrasive article of  claim 7 , wherein W RP  is less than or equal to 30.0% D CP , such as less than or equal to 27.5% D CP , less than or equal to 25% D CP , or less than or equal to 22.5% D CP . 
     
     
         9 . An abrasive article, comprising:
 a core, the core having an upper surface, an outer peripheral surface, an upper recessed portion extending into the core from the upper surface and an peripheral recess extending into the outer peripheral surface, wherein the upper recessed portion includes a recessed surface;   a bonded abrasive body disposed within the peripheral recess of the outer peripheral surface of the core; and   a cover plate, wherein the cover plate fits entirely within the upper recessed portion of the core and mates with the recessed surface.   
     
     
         10 . The abrasive article of  claim 9 , wherein the recessed portion has a recessed surface formed at an angle, a, with respect to the upper surface and a is greater than or equal to 5°. 
     
     
         11 . The abrasive article of  claim 10 , wherein a is less than or equal to 30°, such as less than or equal to 27.5°, less than or equal to 25°, less than or equal to 22.5°, or less than or equal to 22°. 
     
     
         12 . The abrasive article of  claim 9 , wherein the recessed portion has a surface area, A RP , and the cover plate has a surface area, A CP , and A RP  is less than or equal to 75.0% A CP . 
     
     
         13 . The abrasive article of  claim 12 , wherein A RP  is greater than or equal to 40.0% A CP , such as greater than or equal to 42.5% A CP , greater than or equal to 45.0% A CP , greater than or equal to 47.5% A CP , greater than or equal to 50.0% A CP , greater than or equal to 52.5% A CP , or greater than or equal to 55.0% A CP . 
     
     
         14 . An abrasive article, comprising:
 a core, the core having an upper surface, an outer peripheral surface, an upper recessed portion extending into the core from the upper surface and a peripheral recess extending into the outer peripheral surface, wherein the upper recessed portion is sized and shaped to receive a complimentary sized and shaped cover plate therein; and   a bonded abrasive body disposed within the peripheral recess of the outer peripheral surface of the core.   
     
     
         15 . The abrasive article of  claim 14 , wherein the cover plate is made from a metal, a metal alloy, or a combination thereof. 
     
     
         16 . The abrasive article of  claim 15 , wherein the cover plate is made from non-ferrous metal. 
     
     
         17 . The abrasive article of  claim 14 , wherein no part of the abrasive article extends above the upper surface of the core. 
     
     
         18 . The abrasive article of  claim 14 , wherein no part of the abrasive article or the cover plate extends above the upper surface of the core. 
     
     
         19 . The abrasive article of  claim 14 , wherein the core comprises and an inner volume, V C ; the cover plate can displace a volume, V D , when the cover plate is installed within the core; and V D  is greater than or equal to 60.0% V C . 
     
     
         20 . The abrasive article of  claim 19 , wherein V D  is less than or equal to 100.0% V C , such as less than or equal to 97.5% V C , less than or equal to 95.0% V C , less than or equal to 92.5% V C , less than or equal to 90.0% V C , less than or equal to 87.5% V C , or less than or equal to 85.0% V C .