Evaluation of Environmental Burden in Eco-friendly Machining Method using Life Cycle Assessment Method-Estimation of Carbon Dioxide Emission in Eco-friendly Turning Method-

Some eco-friendly machining methods, such as MQL machining and cold-air jet machining method, have been recently developed instead of the traditional wetting machining. The carbon dioxide emission in the traditional wet turning method and the eco-friendly turning methods were estimated using Life Cycle Assessment (LCA) method in order to clarify an effect of eco-friendly machining on the environment. Inventory data concerning the carbon dioxide emissions was estimated based on the experimental results and literature. The evaluated carbon dioxide emissions from both the machining methods of the wet and the eco-friendly were compared.The amount of the carbon dioxide emission from the eco-friendly machining method marked 8.1×10 3 kg/year for the cold-air jet and 8.7×10 3kg/year for the MQL, less than about 70% of the amount of that from the wet machining method. Each annual cost was also estimated in the same conditions of the estimation of the emission. The annual cost of the production on the cold-air jet machining method marked approximately 70% of that of the wet. This study verifies that the eco-friendly machining methods are capable of producing smaller amount of the carbon dioxide emission than the wet machining method.