Porous grinding tool and method for grinding a roll

Abstract

A porous, roll-grinding tool has an abrasive surface which is adapted to contact and grind the surface of a roll and configured to a planar polygonal shape having 4 to 20 sides. Using the grinding tool, a roll can be ground within a satisfactory dimensional tolerance, with feed marks crossing the circumferential direction of the roll at a small feed mark pitch inclination angle, so that no streaky printing defects will be produced when the ground roll is used in printing.

1 . A porous, roll-grinding tool having an abrasive surface adapted to contact and grind the surface of a roll, said abrasive surface being configured to a planar polygonal shape having from four to twenty sides.  
     
     
         2 . The grinding tool of  claim 1  which consists essentially of fine abrasive grains bound with a polyvinyl acetal resin and a thermosetting resin.  
     
     
         3 . The grinding tool of  claim 1  which is used in grinding a gravure printing copper-plated roll.  
     
     
         4 . A method for grinding the surface of a roll having an axis, comprising the steps of rotating the roll about the roll axis, and placing a porous grinding tool in contact with the surface of the rotating roll while rotating the grinding tool about an axis thereof and moving the grinding tool along the axial direction of the roll, thereby grinding the roll surface with the grinding tool, 
 said grinding tool having an abrasive surface which is configured to a planar polygonal shape having from four to twenty sides.    
     
     
         5 . The method of  claim 4  wherein the roll is rotated at 50 to 150 rpm, said grinding tool is rotated at 300 to 1,000 rpm, and said grinding tool is moved at a feed rate of 0.3 to 1.5 m/min.  
     
     
         6 . The method of  claim 4  wherein the roll is a gravure printing copper-plated roll.