To firmly fix the abrasive grain by containing a filler of the prescribed grain size in a resin having the prescribed elasticity and softening temperature, and to form an abrasive cutting edge and a tip pocket from the beginning by the raise of the abrasive grain.
A core wire 1 is formed by a roving 2, and its outer circumferential surface is covered with a coating in which the abrasive grain 3 and a filler 4 are mixed in a solution where the resin is solved in the solvent by a resin bond 5 formed through baking and hardening. The grain size of the abrasive grain 3 is not less than 2/3 of the thickness of a resin bond layer, and not more than 1/2 of the diameter of a fiber body, and the resin bond 5 is formed of a resin of not less than 100 kg/mm3 in elasticity and not less than 200°C in softening temperature. The resin contains the filler 4 whose grain size is less than 2/3 of the thickness of the resin bond layer.
KAMIOKA ISAO
MIZOGUCHI AKIRA
YAMANAKA MASAAKI
OGAWA HIDEKI
URAKAWA NOBUO
OSAKA DIAMOND IND
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