Grinding wheel

Abstract

A grinding wheel 10 comprises a disk core 11 and a grinding stone 20 surrounding the core 11 . The grinding stone 20 includes a first abrasive portion 30 and a second abrasive portion 40 . The first abrasive portion forms a circumferential surface of the grinding stone 20 and has small grains. The second abrasive portion 40 forms at least one lateral surface of the grinding stone 20 and has larger grains than the first abrasive portion 30.

1 . A grinding wheel comprising: 
 a disk core;    a grinding stone surrounding the core;    a first abrasive portion forming a circumferential surface of the grinding stone;    a second abrasive portion forming at least one lateral surface of the grinding stone; and    wherein the second abrasive portion has larger grains than the first abrasive portion.    
   
   
       2 . A grinding wheel according to  claim 1 , wherein: 
 the second abrasive portion is studded with single layer of the grains.    
   
   
       3 . A grinding wheel according to  claim 1 , wherein: 
 the second abrasive portion is studded with a multiple layers of the grains.    
   
   
       4 . A grinding wheel according to  claim 1 , wherein: 
 the external radius of the second abrasive portion is smaller than the first abrasive portion.    
   
   
       5 . A grinding wheel according to  claim 1 , wherein: 
 the external radius of the second abrasive portion is as large as the first abrasive portion.    
   
   
       6 . A grinding wheel according to  claim 1 , wherein: 
 the corner of the second abrasive portion forms a chamfer    
   
   
       7 . A grinding wheel according to  claim 6 , wherein: 
 the chamfer is R-chamfer and its radius is larger than the width of the second abrasive portion.    
   
   
       8 . A grinding wheel according to  claim 1 , wherein: 
 the corner of the second abrasive portion is right-angled.