Grinding wheel and method of manufacturing grinding wheel

Abstract

Object: To provide a grinding wheel and a method of manufacturing a grinding wheel having added value while providing a suppressed manufacturing cost. Solution Means: The grinding wheel is a grinding wheel including an abrasive portion including nonwoven fabric, wherein the abrasive portion includes an outer peripheral portion formed with the nonwoven fabric including abrasive grains on an outer peripheral side, and an inner peripheral portion formed with the nonwoven fabric not including the abrasive grains, and a ratio of a thickness in a radial direction of the outer peripheral portion to a thickness in a radial direction of the abrasive portion is from 3% to 60%.

1 . A grinding wheel comprising an abrasive portion including nonwoven fabric, wherein
 the abrasive portion includes an outer peripheral portion formed with the nonwoven fabric including abrasive grains on an outer peripheral side, and an inner peripheral portion formed with the nonwoven fabric not including the abrasive grains, and   a ratio of a thickness in a radial direction of the outer peripheral portion to a thickness in a radial direction of the abrasive portion is from 3% to 60%.   
     
     
         2 . A grinding wheel comprising an abrasive portion including nonwoven fabric, wherein
 the abrasive portion includes an outer peripheral portion formed on an outer peripheral side, and an inner peripheral portion softer than the outer peripheral portion, and   a ratio of a thickness in a radial direction of the outer peripheral portion to a thickness in a radial direction of the abrasive portion is from 3% to 60%.   
     
     
         3 . The grinding wheel according to  claim 1 , wherein
 the abrasive portion is constituted by laminating a plurality of nonwoven fabric sheets, and   the plurality of nonwoven fabric sheets are laminated in a direction substantially perpendicular to the radial direction.   
     
     
         4 . The grinding wheel according to  claim 3 , wherein the nonwoven fabric sheets are laminated in a circumferential direction. 
     
     
         5 . The grinding wheel of  claim 3 , wherein the nonwoven fabric sheets are laminated in an axial direction. 
     
     
         6 . The grinding wheel according to  claim 1 , wherein durometer hardness of the outer peripheral portion is 80 or greater. 
     
     
         7 . (canceled) 
     
     
         8 . The grinding wheel according to  claim 1 , wherein
 the abrasive portion comprises:   an outer peripheral portion formed on an outer peripheral side;   an inner peripheral portion softer than the outer peripheral portion; and   an intermediate portion disposed between the outer peripheral portion and the inner peripheral portion, the intermediate portion being a layer different from the outer peripheral portion and the inner peripheral portion, and including at least a resin material.   
     
     
         9 . The grinding wheel according to  claim 8 , wherein the intermediate portion is harder than the inner peripheral portion. 
     
     
         10 . The grinding wheel according to  claim 8 , wherein the intermediate portion is harder than the outer peripheral portion. 
     
     
         11 . The grinding wheel according to  claim 8 , wherein the outer peripheral portion includes a lubricant. 
     
     
         12 . The grinding wheel according to  claim 8 , wherein the outer peripheral portion and the intermediate portion include the same resin material. 
     
     
         13 . A method of manufacturing a grinding wheel comprising an abrasive portion constituted by laminating a plurality of nonwoven fabric sheets, the method comprising the steps of:
 laminating a plurality of nonwoven fabric sheets in a circumferential direction;   forming a gap between the nonwoven fabric sheets adjacent to each other in the circumferential direction; and   incorporating abrasive grains in an outer peripheral edge portion of each of the nonwoven fabric sheets between which the gap is formed.   
     
     
         14 . The grinding wheel according to  claim 2 , wherein
 the abrasive portion is constituted by laminating a plurality of nonwoven fabric sheets, and   the plurality of nonwoven fabric sheets are laminated in a direction substantially perpendicular to the radial direction.   
     
     
         15 . The grinding wheel according to  claim 14 , wherein the nonwoven fabric sheets are laminated in a circumferential direction. 
     
     
         16 . The grinding wheel of  claim 14 , wherein the nonwoven fabric sheets are laminated in an axial direction. 
     
     
         17 . The grinding wheel according to  claim 2 , wherein durometer hardness of the outer peripheral portion is 80 or greater. 
     
     
         18 . The grinding wheel according to  claim 2 , wherein
 the abrasive portion comprises:   an outer peripheral portion formed on an outer peripheral side;   an inner peripheral portion softer than the outer peripheral portion; and   an intermediate portion disposed between the outer peripheral portion and the inner peripheral portion, the intermediate portion being a layer different from the outer peripheral portion and the inner peripheral portion, and including at least a resin material.   
     
     
         19 . The grinding wheel according to  claim 18 , wherein the intermediate portion is harder than the inner peripheral portion. 
     
     
         20 . The grinding wheel according to  claim 18 , wherein the intermediate portion is harder than the outer peripheral portion. 
     
     
         21 . The grinding wheel according to  claim 18 , wherein the outer peripheral portion includes a lubricant.