Polishing grindstone and method for producing same

Abstract

A polishing grindstone according to the present invention comprises abrasive grains dispersed in, bound to and held by a particulate matrix composed of rubber particles. With the polishing grindstone, the abrasive grains decreased in polishing properties owing to wear associated with polishing become easily detached from the surface of the grindstone, and fresh abrasive grains not worn are exposed at the surface, thus permitting polishing at a constantly stable speed, and ensuring stable polishing for a long term.

1 . A polishing grindstone comprising abrasive grains dispersed in, bound to and held by a particulate matrix composed of rubber particles.  
     
     
         2 . The polishing grindstone according to  claim 1 , wherein a particle size of the rubber particles is within a range of 5 to 300 μm.  
     
     
         3 . The polishing grindstone according to  claim 1 , wherein the abrasive grains are incorporated in an amount of 40 to 80 parts by weight per 100 parts by weight of the rubber particles forming the particulate matrix.  
     
     
         4 . A method for producing a polishing grindstone, comprising: 
 a mixing step of mixing rubber particles and abrasive grains to prepare a particulate mixture;    a compression molding step of compression molding the particulate mixture into a predetermined shape; and    a heat treatment step of heat-treating a molded product obtained in the compression molding step.    
     
     
         5 . The method according to  claim 4 , wherein the abrasive grains are used in an amount of 40 to 80 parts by weight per 100 parts by weight of the rubber particles.  
     
     
         6 . The method according to  claim 4 , wherein the compression molding is performed at a pressure of 50 to 300 kg/cm 2 .  
     
     
         7 . The method according to  claim 4 , wherein the heat treatment is performed at a temperature of 150 to 250° C.  
     
     
         8 . The method according to  claim 4 , wherein the compression molding and the heat treatment are performed simultaneously.