GRINDSTONE AND MANUFACTURING METHOD OF GRINDSTONE

To provide a grindstone capable of grinding and polishing with high accuracy and high efficiency a workpiece such as a cylindrical metal component, and achieving great process improvement, quality improvement due to polishing accuracy improvement or development to new use, and to provide a manufacturing method of the grindstone.SOLUTION: A grindstone comprising a cured material obtained by curing an abrasive grain composition containing abrasive grains, a resin and a curing catalyst is such that: the resin contains 50 mass% or more of a resol type phenol resin; and a blend amount of the curing catalyst is 5-23 pts.mass based on 100 pts.mass of the phenol resin. A manufacturing method of the grindstone includes steps of: preparing an abrasive grain composition by blending blended liquid containing abrasive grains, a resin and a curing catalyst; pouring the abrasive grain composition into a mold; and curing the abrasive grain composition poured into the mold. The resin in the abrasive grain composition contains 50 mass% or more of a resol type phenol resin. In the step of curing the abrasive grain composition, curing is performed in two heating steps of heating at a second heating temperature higher than a first heating temperature for the predetermined time after heating at the first heating temperature for predetermined time.SELECTED DRAWING: None 【課題】円筒状金属部品等の被加工物を高精度かつ高効率に研削研磨することができ、大幅な工程改善、研磨精度向上による品質改善、または新規用途への展開が実現する砥石及びその砥石の製造方法を提供する。【解決手段】本発明は砥粒、樹脂及び硬化触媒を含む砥粒組成物を硬化した硬化物からなる砥石であり、樹脂はレゾール型フェノール樹脂を５０質量％以上含み、硬化触媒の配合量がフェノール樹脂１００質量部に対し５～２３質量部である。本発明の砥石の製造方法は、砥粒、樹脂及び硬化触媒を含む混合液を混合して砥粒組成物を作製する工程、砥粒組成物を型に流し込む工程、及び型に流し込んだ砥粒組成物を硬化させる工程を含み、砥粒組成物における樹脂はレゾール型フェノール樹脂を５０質量％以上含み、砥粒組成物を硬化させる工程は、第一の加熱温度で所定時間加熱した後、第一の加熱温度よりも高温の第二の加熱温度で所定時間加熱する二段階加熱による硬化である。【選択図】なし