Bonded abrasive wheel and method of making the same

Abstract

A bonded abrasive wheel comprises magnetizable abrasive particles retained in a first organic binder. The bonded abrasive wheel has a central portion adjacent to a central hub, an outer circumference, and a rotational axis extending through the central hub. A majority of the magnetizable abrasive particles are substantially parallel to the rotational axis. A method of making the bonded abrasive wheel is also disclosed.

1 - 24 . (canceled) 
     
     
         25 . A bonded abrasive wheel comprising magnetizable abrasive particles retained in a first organic binder, wherein the bonded abrasive wheel has a central portion adjacent to a central hub, wherein the bonded abrasive wheel has an outer circumference and a rotational axis extending through the central hub, wherein a majority of the magnetizable abrasive particles are substantially parallel to the rotational axis. 
     
     
         26 . The bonded abrasive wheel of  claim 25 , wherein the bonded abrasive wheel comprises:
 a primary abrasive layer comprising the magnetizable abrasive particles retained in the first organic binder;   a secondary abrasive layer comprising non-magnetizable abrasive particles retained in a second organic binder; and   a first reinforcing material disposed between and contacting the primary abrasive layer and the secondary abrasive layer.   
     
     
         27 . The bonded abrasive wheel of  claim 26 , further comprising a second reinforcing material contacting the secondary abrasive layer opposite the first reinforcing material. 
     
     
         28 . The bonded abrasive wheel of  claim 25 , wherein the magnetizable abrasive particles comprise ceramic bodies, each having a respective magnetizable layer disposed thereon. 
     
     
         29 . The bonded abrasive wheel of  claim 28 , wherein the ceramic bodies comprise ceramic rods. 
     
     
         30 . The bonded abrasive wheel of  claim 28 , wherein the ceramic bodies comprise ceramic platelets. 
     
     
         31 . The bonded abrasive wheel of  claim 25 , wherein the magnetizable layer consists essentially of a metal or metal alloy. 
     
     
         32 . The bonded abrasive wheel of  claim 25 , wherein the magnetizable layer comprises magnetizable particles retained in a binder. 
     
     
         33 . A method of making a bonded abrasive wheel, the method comprising steps:
 a) disposing a layer of a first curable composition into a mold having a circular mold cavity with a depressed central portion adjacent to a central hub, wherein the circular mold cavity has an outer circumference and a rotational axis extending through the central hub, and wherein the curable composition comprises filler abrasive particles dispersed in a first organic binder precursor;   b) disposing a first porous reinforcing material onto the layer of first curable composition;   c) disposing a layer of a second curable composition onto the porous reinforcing material and first curable composition, wherein the second curable composition comprises magnetizable abrasive particles dispersed in a second organic binder precursor; and   d) applying a magnetic field to the curable composition such that a majority of the magnetizable abrasive particles are substantially parallel to the rotational axis; and   e) at least partially curing the curable composition to provide the bonded abrasive wheel.   
     
     
         34 . The method of  claim 33 , wherein prior to step a) a second porous reinforcing material is placed in the circular mold cavity, and wherein the layer of the first curable composition is disposed on the second reinforcing material. 
     
     
         35 . The method of  claim 33 , further comprising separating the bonded abrasive wheel from the mold. 
     
     
         36 . The method of  claim 33 , wherein steps a) and b) are simultaneous. 
     
     
         37 . The method of  claim 33 , wherein steps b) and c) are simultaneous. 
     
     
         38 . The method of  claim 33 , wherein step c) further comprises compressing the layers of the first and second curable compositions. 
     
     
         39 . The method of  claim 33 , wherein step b) further comprises mechanically agitating at least the layer of the second curable composition. 
     
     
         40 . The method of  claim 33 , wherein the magnetizable abrasive particles comprise ceramic bodies, each having a respective magnetizable layer disposed thereon. 
     
     
         41 . The method of  claim 40 , wherein the ceramic bodies comprise ceramic rods. 
     
     
         42 . The method of  claim 40 , wherein the ceramic platelets comprise ceramic truncated triangular pyramids. 
     
     
         43 . The method of  claim 40 , wherein the magnetizable layer consists essentially of a metal or metal alloy. 
     
     
         44 . The method of  claim 40 , wherein the magnetizable layer comprises magnetizable particles retained in a binder.