S132021 Ni基耐熱合金のニアドライ切削における超硬合金の工具摩耗特性([S132-02]先進切削加工技術(2))

Abstract

In recent years, high-combustion-efficiency jet engines are required in the aircraft industry. The high burning temperature is necessary for upgrading combustion efficiency of jet engines. Therefore, Inconel 718 which has excellent mechanical properties and chemical properties are selected for many jet engine parts. However, Inconel 718 is difficult to cut material because of its low-thermal-conductivity. Consequently, Wet cutting is ordinarily adopted to reduce the heat on cutting heat edge in Inconel 718 cutting. Wet cutting which uses large amount of cutting fluid requires much cost and energy on maintenance or disposal of cutting fluid, and this method is environmentally-unfriendly. From the view point of reducing cost and environmental load, we examined the method of Near-Dry cutting which uses very small amount of cutting fluid for the cylindrical cutting of Inconel 718. However, this method has some problems, such as tool wear and cutting stock removal rate. For example, the cutting stock removal rate is reduced because of cutting edge fracture occurs easily on this method. In this report, we experimentally examined the relationship between cutting speed, tool materials and tool fracture on Near-Dry cutting.