[P-6] Surface Properties of Sintered Tungsten Carbide with Ultra-Fine Grains in Cutting by Diamond-Coated Ball-End Tools 〇Tetsuo Samukawa1、Kazuo Shiramizu1、Haruhiko Suwa1 (1.Setsunan University) キーワード:Machining、Sintered tungsten carbide、Diamond-coated ball end tools、Surface properties、Cutting condition