摘要 |
PROBLEM TO BE SOLVED: To provide a disk type colored grinding wheel for cutting furnished with a adequate hardness as well as having a sufficient toughness, durability, and cutting sharpness, and its manufacturing method. SOLUTION: In the manufacturing method of a disk type colored grinding wheel for cutting formed by dispersing abrasive grains to a matrix of a phenolic resin, a grinding wheel is manufactured by applying a blank grinding wheel manufacturing process to semihot form a raw abrasive material including a paint, a resin raw material, and abrasive grains into a disk form at the forming temperature 60 to 70 deg.C, and a heat hardening process to raise a temperature of the blank grinding wheel from 135-145 deg.C to 155-165 deg.C taking 8 to 10 hours, and then holding the temperature 155 to 165 deg.C in the final 2 to 4 hours, so as to harden the phenolic resin, and at the same time, 0.6 to 1.0 wt.% of magnesium oxide is contained in the raw abrasive material.
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