作者单位:ZHANG Dan,QIANG Xiang-hong(Mechanical &Electrical Department, Tangs han Vocational College of Science and Technology,Tangshan 063001, China)张丹,强向红(唐山科技职业技术学院机电系,河北唐山063001)JIA Ji-hua,ZHAO Wen-cheng(Metallurgical Department, Tangshan Vocational College of Science and Technology, Tangshan 063001, China)贾继华,赵文成(唐山科技职业技术学院冶金系,河北唐山063001)