〈학술논문〉임펠러 표면조도 개선을 위한 최적 가공조건에 관한 연구

5-axis NC machining has a good advantage of the accessibility of tool motion by adding two rotary axes. It offers numerous advantages such as expanding machining fields in parts of turbo machineries like impeller, propeller, turbine blades, rotors, reasonable tool employment and great reduction of the set-up process. However, as adding two rotary axes, it is difficult to choose suitable machining conditions in terms of tool path, tool posture, feedrate control at a tool tip, and post-processing. Therefore, in this paper, it is proposed to decide optimal cutting condition through an experimental method such as adopting various tool paths, tool postures, and feedrate types. Machining experiment on AL7075 for impeller is performed to define optimal cutter path, and measurement of surface roughness on machined surfaces depended on each machining condition are performed. By defining optimal machining condition, we should have conclusion as improving the surface quality in the aspect of surface roughness and machined shapes of surfaces.