Cup grinding wheel

Abstract

A cup grinding wheel 20 which is mounted on a rotating tool 10 and rotates to grind a surface of a physical object is formed of a central base member 21 a approximately shaped like a circular disc having a mounting hole 22 a at a center thereof, an exterior base member 21 b, a grinding portion 27 and a screw member 29. The exterior base member 21 b is formed of a rim engaging portion 25 which can be engaged with an outer circumferential portion of the central base member 21 a, and a flanged rim fastening portion 26 provided on a front rim of the rim engaging portion 25. Furthermore, the grinding portion 27 is fixed to the front of the rim fastening portion 26 of the exterior base member 21 b with the screw member 29.

What is claimed is: 
     
         1 . A cup grinding wheel which is mounted on a rotating tool and rotates to grind a surface of a physical object, the cup grinding wheel comprising:
 a central base member approximately shaped like a circular disc having a mounting hole at a center thereof;   an exterior base member formed of a rim engaging portion which can be engaged with a circumferential portion of the central base member, and a flanged rim fastening portion provided on one rim of the rim engaging portion;   a grinding portion; and   a screw member for fastening the grinding portion to one surface of the rim fastening portion.   
     
     
         2 . The cup grinding wheel according to  claim 1 , wherein
 a plurality of ejecting holes are provided around the mounting hole of the central base member.   
     
     
         3 . The cup grinding wheel according to  claim 1 , wherein
 the grinding portion is configured such that a grinding chip is fixed on one surface of a supporting base plate made of iron or steel, and the supporting base plate is fastened to the rim fastening portion.   
     
     
         4 . The cup grinding wheel according to  claim 3 , wherein
 the grinding chip is a sintered product obtained by molding and sintering diamond abrasive grain by use of bonding agent.   
     
     
         5 . The cup grinding wheel according to  claim 3 , wherein
 the grinding chip is fastened to the supporting base plate by brazing.   
     
     
         6 . The cup grinding wheel according to  claim 3 , wherein
 the grinding chip is formed of a plurality of grinding chip, the supporting base plate is ring-shaped, and the plurality of grinding chips are fixed at a certain interval on the supporting base plate.   
     
     
         7 . The cup grinding wheel according to  claim 3 , wherein
 the supporting base plate and the grinding chip are ring-shaped respectively, and a plurality of grooves are provided at certain positions of the grinding chip.   
     
     
         8 . The cup grinding wheel according to  claim 1 , wherein
 the grinding portion is configured such that grinding abrasive grain is fixed on one surface of a supporting base plate made of iron or steel, and the supporting base plate is fastened to the rim fastening portion.   
     
     
         9 . The cup grinding wheel according to  claim 8 , wherein
 the abrasive grain is fastened directly to the supporting base plate by welding or electrodeposition.   
     
     
         10 . The cup grinding wheel according to  claim 1 , wherein
 the grinding portion is formed of a plurality of small grinding portions, with the small grinding portions being fixed at certain intervals to the rim fastening portion.   
     
     
         11 . The cup grinding wheel according to  claim 10 , wherein
 each of the plurality of small grinding portions is configured such that a grinding chip or grinding abrasive grain is fixed on one surface of a supporting base plate made of iron or steel, and the supporting base plate is fastened to the rim fastening portion.   
     
     
         12 . The cup grinding wheel according to  claim 10 , wherein
 the plurality of small grinding portions are fastened to the rim fastening portion with screw members.   
     
     
         13 . The cup grinding wheel according to  claim 1 , wherein
 at least either the central base member or the exterior base member is made of resin material.   
     
     
         14 . The cup grinding wheel according to  claim 1 , wherein
 the central base member is made of resin material, and the exterior base member is made of aluminum.   
     
     
         15 . The cup grinding wheel according to  claim 14 , wherein
 the resin material is enforced plastic which has a melting point of 150 degrees Celsius or more, a continuous use temperature of 80 degrees Celsius or more, and a tensile strength of 60 MPa or more.