灰铸铁件加工面孔洞缺陷的原因分析及对策  

Analysis of the Causes and Countermeasures of Machined Surface Defects of Gray Iron Castings

作　　者：潘密 杨宗明 杨华 周焱 何程 程婧璠 PAN Mi;YANG Zong-ming;YANG Hua;ZHOU Yan;HE Cheng;CHENG Jing-fan(Wuhan Wuzhong Casting and Forging Co.,Ltd.,Wuhan Heavy Duty Machine Tool Group Corporation,Wuhan 430205,Hubei,China;State Key Laboratory of Material Forming and Mold Technology,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;School of Mechanical Engineering,Wuhan Software Engineering Vocational College,Wuhan 430205,Hubei,China)

机构地区：[1]武汉重型机床集团有限公司,武汉武重铸锻有限公司,湖北武汉430205 [2]华中科技大学,材料成型与模具技术国家重点实验室,湖北武汉430074 [3]武汉软件工程职业学院机械工程学院,湖北武汉430205

出　　处：《铸造》2023年第10期1350-1356,共7页Foundry

摘　　要：采用金相方法对HT250灰铸铁铸件加工面孔洞缺陷的微观、宏观的形貌特征和产生原因进行了比对分析,认为:灰铸铁切削加工后形成的孔洞缺陷实际是灰铸铁中的石墨剥落而形成的,石墨剥落时可能有部分附着基体跟随被剥落,结合实际熔化、加工等控制工艺要求,提出了预防和改善孔洞缺陷的具体措施。The microscopic and macroscopic morphology characteristics and causes of the hole defects in the machined surface of HT250 gray cast iron castings were compared and analyzed by metallographic method.It is believed that the hole defects formed after the machining of gray cast iron are actually caused by the peeling of graphite in gray cast iron,and some of the attached matrix may be followed by the peeling of graphite.Combined with the actual melting,machining and other control process requirements,specific measures to prevent and improve hole defects are proposed.

关 键 词：灰铸铁 加工面 孔洞 石墨 

分 类 号：TG245[金属学及工艺—铸造]