VITRIFIED BOND GRINDING WHEEL

PROBLEM TO BE SOLVED: To provide a grinding wheel capable of obtaining stable and satisfactory cutting ability and a machined face without causing loading and dulling of the grinding wheel in super-finish machining. SOLUTION: An abrasive material layer 10 is composed of collected abrasive grains 1, a binder 2, and large air holes 3. The collected abrasive grain 1 is composed of single abrasive grains 11, a binder 12, and small air holes 13, and several hundreds of cBN abrasive grains are bound by vitrified binder to constitute the collected abrasive grain 1. Since air holes in the abrasive material layer 10 are composed of the large air holes 3 among the collected abrasive grains 1 and the small air holes 13 in the collected abrasive grains 1, the large air holes 3 increase the grinding property, the small air holes 13 increase the finish machining property, the discharge property of chips is improved, and loading does not occur easily to provide the grinding wheel provided with high grinding property.