[B-7-1] Factor Analyzing of Defects in Copper Alloy Castings Manufactured by Sand Mold Based on Machine Learning and Its Experimental Examination Makoto Nikawa1, 〇Ryohei Oie1, Sho Sakai1, Miho Ota2, Masayuki Koyama2, Yoshihiro Tsuji3, Yoshiki Mizutani4, Minoru Yamashita1 (1.Gifu University, 2.MIZSEI MFG Co., Ltd., 3.Miyama Chuzou Co., Ltd., 4.Gifu Prefectural Industrial Technology Center) Keywords:Others、Sand mold、Machine learning、Casting defect、Copper alloy