[B-5-5] Fundamental Study on Double-Layered Surface Formation by Electrical Discharge Machining 〇Yuki Ikeuchi1、Shun-Ichiro Tsuetani1、Ryoji Kitada2、Akira Okada1 (1.Okayama University、2.Sojo University) キーワード:EDM/ECM/others、Double-layered surface、 Surface roughness