Polishing tools and methods of polishing substrates

Abstract

Polishing tools and methods of polishing a glass substrate are disclosed. A polishing tool (200) includes a stem (220) and a polishing material (210) bonded to the stem (220). The polishing material (210) includes, in volume concentration, about 18% to about 42% phenolic resin, about 18% to about 30% zinc oxide, about 1% to about 10% magnesium oxide, a cooling agent, and an abrasive.

1 . A polishing tool comprising:
 a stem; and   a polishing material bonded to the stem, wherein the polishing material comprises, in volume concentration:
 about 18% to about 42% phenolic resin; 
 about 18% to about 30% zinc oxide; 
 about 1% to about 10% magnesium oxide; 
 a cooling agent; and 
 an abrasive. 
   
     
     
         2 . The polishing tool of  claim 1 , wherein the polishing material further comprises, in volume concentration, about 16% to about 28% ferric oxide. 
     
     
         3 . The polishing tool of  claim 1 , wherein the polishing material further comprises, in volume concentration, about 13% to about 29% silicon carbide. 
     
     
         4 . The polishing tool of  claim 1 , wherein the polishing material further comprises, in volume concentration, about 10% to about 14% rubber. 
     
     
         5 . The polishing tool of  claim 1 , wherein the abrasive is nickel-plated carborundum added to the polishing material as a super addition, in volume concentration, of about 100% to about 200%, and the nickel-plated carborundum has a grain size of about 1 μm to about 5 μm. 
     
     
         6 . The polishing tool of  claim 5 , wherein the nickel-plated carborundum is added to the polishing material as a super addition, in volume concentration, of about 148% to about 152%. 
     
     
         7 . The polishing tool of  claim 1 , wherein the cooling agent is copper powder present in the polishing material at a volume concentration of about 6% to about 32%. 
     
     
         8 . The polishing tool of  claim 1 , wherein polishing tool is configured to be received by a CNC machine and polish an edge of a glass substrate. 
     
     
         9 . A method of creating a high efficiency polishing tool configured to be received by a CNC machine comprising:
 mixing a polishing material, the polishing material comprising, in volume concentration:
 about 18% to about 42% phenolic resin; 
 about 18% to about 30% zinc oxide; 
 about 1% to about 10% magnesium oxide; 
 a cooling agent; and 
 an abrasive; 
   feeding the polishing material into a mold;   pre-pressing the polishing material within the mold;   curing the polishing material;   holing the polishing material;   assembling a stem to the polishing material by passing the stem into the hole of the polishing material; and   bonding the polishing material to the stem.   
     
     
         10 . The method of  claim 9 , wherein pre-pressing is performed at about 130° C. to about 140° C. for about 1 minute to about 6 minutes. 
     
     
         11 . The method of  claim 10 , wherein the feeding step and pre-pressing step comprise 8-10 cycles of feeding and pre-pressing. 
     
     
         12 . The method of  claim 9 , further comprising mechanically forming the polishing material into a pre-determined configuration. 
     
     
         13 . The method of  claim 9 , wherein the polishing material further comprises, in volume concentration, about 16% to about 28% ferric oxide. 
     
     
         14 . The method of  claim 9 , wherein the polishing material further comprises, in volume concentration, about 13% to about 29% silicon carbide. 
     
     
         15 . The method of  claim 9 , wherein the polishing material further comprises, in volume concentration, about 10% to about 14% rubber. 
     
     
         16 . The method of  claim 9 , wherein the abrasive is nickel-plated carborundum added, in volume concentration, to the polishing material as a super addition of about 100% to about 200%, and the nickel-plated carborundum has a grain size of about 1 μm to about 5 μm. 
     
     
         17 . The method of  claim 16 , wherein the nickel-plated carborundum is added as a super addition, in volume concentration, of about 148% to about 152%. 
     
     
         18 . The method of  claim 9 , wherein the cooling agent is copper powder present in the polishing material at a volume concentration of about 6% to about 32%. 
     
     
         19 . The method of  claim 9 , wherein the curing is performed at about 170° C. to about 190° C. for about 85 minute to about 95 minutes. 
     
     
         20 . A method of polishing an edge of a glass substrate using a CNC machine comprising:
 preparing the glass substrate in the CNC machine, the prepared glass substrate comprising a perimeter defined by an edge of the glass substrate;   attaching a polishing tool comprising a polishing material to the CNC machine, the polishing material comprising, in volume concentration:
 about 18% to about 42% phenolic resin; 
 about 18% to about 30% zinc oxide; 
 about 1% to about 10% magnesium oxide; 
 a cooling agent; and 
 an abrasive; 
   aligning the polishing tool with the edge of the glass substrate; and   polishing the edge of the glass substrate, wherein a stem of the polishing tool continuously moves closer to the edge of the glass substrate as the polishing tool traverses the perimeter of the glass substrate.   
     
     
         21 . The method of  claim 20 , wherein the stem of the polishing tool continuously moves closer to the edge of the glass substrate at a rate of about 0.15 μm/mm to about 0.028 μm/mm. 
     
     
         22 . The method of  claim 20 , wherein the glass substrate is chemically strengthened.