単結晶ダイヤモンドを切り刃とする自己研磨切削法によるセラミックスの加工

抄録

Alumina-ceramic materials, with these characteristic heat resistant, anti-wear and anti-corro-sive properties, are used for structural components for automotive, spacecraft and aircraft. These materials are highly brittle, super hard and difficult to be machined. Therefore, the cost of machining alumina-ceramic materials is considerably higher than that of metals. As a result a new cutting method has been developed to achieve lower cost processing of the alumina-ceramic materials. In this cutting process, unfinished natural single crystal octahedral diamond corners can be successfully used as a tool to cut ceramics, when cutting with the sharp edge of diamond corners, it is flattened due to abrasion. The flattened diamond tip is repositioned and the newly formed sharp edge is used to cut again. By repeating the repositioning of the diamond tip, natural diamond crystals can be used tool cut alumina ceramics for a longer period of time.