Three layer grinding wheel

Abstract

A multilayer circular grinding wheel includes at least three substantially planar layers including an inner layer and two outer layers immediately adjacent to the inner layer, of which at least the inner layer has a proportion of diamond abrasive grit, the proportion of diamond in the abrasive grit being greater in the inner layer than in the outer layers.

What is claimed is: 
     
         1 . A multilayer circular grinding wheel comprising:
 at least three substantially planar layers including an inner layer and two outer layers immediately adjacent to the inner layer, of which at least the inner layer has a proportion of diamond abrasive grit such that the proportion of diamond in the abrasive grit is greater in the inner layer than in the outer layers.   
     
     
         2 . The grinding wheel according to  claim 1 , wherein the inner layer has a proportion of at least 50% by weight of diamond in the abrasive grain. 
     
     
         3 . The grinding wheel according to  claim 1 , wherein the inner layer has a proportion of at least 75% by weight of diamond in the abrasive grain. 
     
     
         4 . The grinding wheel according to  claim 1 , wherein the inner layer has a proportion of at least 90% by weight of diamond in the abrasive grain. 
     
     
         5 . The grinding wheel according to  claim 1 , wherein the outer layers each have a proportion of less than 90% by weight diamond in the abrasive grain. 
     
     
         6 . The grinding wheel according to  claim 1 , wherein the outer layers each have a proportion of less than 75% by weight diamond in the abrasive grain. 
     
     
         7 . The grinding wheel according to  claim 1 , wherein the outer layers each have a proportion of less than 50% by weight of diamond in the abrasive grain. 
     
     
         8 . The grinding wheel according to  claim 1 , wherein the grinding wheel includes exactly three layers including abrasive grains. 
     
     
         9 . The grinding wheel according to  claim 1 , wherein the outer layers have a same structure or substantially a same structure, and a same axial thickness or substantially a same axial thickness. 
     
     
         10 . The grinding wheel according to  claim 1 , wherein the inner layer and the outer layers are made of a synthetic resin bond. 
     
     
         11 . A method of using the grinding wheel according to  claim 1 . 
     
     
         12 . The method according to  claim 11 , wherein the grinding wheel is bonded with an outer side to a metallic support plate.