Metal-bonded grinding wheel

Abstract

There is provided a metal-bonded grinding stone including an abrasive grain layer in which a plurality of abrasive grains and a plurality of pores are dispersed in a metal bonding material, in which a porosity of the plurality of pores in the abrasive grain layer is 40% or more and 99% or less.

1 . A metal-bonded grinding stone comprising
 an abrasive grain layer in which a plurality of abrasive grains and a plurality of pores are dispersed in a metal bonding material,   wherein a porosity of the plurality of pores in the abrasive grain layer is 40% or more and 99% or less.   
     
     
         2 . The metal-bonded grinding stone according to  claim 1 , wherein each of the plurality of pores is formed in a spherical shape. 
     
     
         3 . The metal-bonded grinding stone according to  claim 2 , wherein an average of sphericity of the plurality of pores is 0.2 or more. 
     
     
         4 . The metal-bonded grinding stone according to  claim 1 , wherein the plurality of pores include an interconnecting pore formed by communicating two or more of the pores. 
     
     
         5 . The metal-bonded grinding stone according to  claim 4 , wherein the interconnecting pore includes two or more of the pores communicating with each other and having a pore diameter of 10 μm or more and 2,000 μm or less. 
     
     
         6 . The metal-bonded grinding stone according to  claim 4 , further comprising a reinforcing portion provided in the interconnecting pore for reinforcing the abrasive grain layer. 
     
     
         7 . The metal-bonded grinding stone according to  claim 6 , wherein the reinforcing portion is filled in at least a part of the interconnecting pore so as to be connected to at least a part of an inner surface of the abrasive grain layer forming the interconnecting pore. 
     
     
         8 . The metal-bonded grinding stone according to  claim 6 , wherein the reinforcing portion contains a resin. 
     
     
         9 . The metal-bonded grinding stone according to  claim 1 , wherein the plurality of pores include an independent pore not communicating with the other pores. 
     
     
         10 . The metal-bonded grinding stone according to  claim 9 , wherein an average pore diameter of the independent pore is 2 μm or more and 100 μm or less. 
     
     
         11 . The metal-bonded grinding stone according to  claim 1 , wherein the plurality of pores include a micropore having a pore diameter of 2 μm or more and 10 μm or less. 
     
     
         12 . The metal-bonded grinding stone according to  claim 11 , wherein a porosity of the micropore in the abrasive grain layer is 0.01% or more and 10% or less. 
     
     
         13 . The metal-bonded grinding stone according to  claim 1 ,
 wherein the plurality of pores include an interconnecting pore formed by communicating two or more of the pores, and   wherein each of the plurality of pores forming the interconnecting pore has a spherical shape.   
     
     
         14 . The metal-bonded grinding stone according to  claim 13 , wherein an average of sphericity of the plurality of pores is 0.2 or more.