刹车鼓铸件缩松缺陷的防止措施  

Measures to Prevent Shrinkage Defects of Brake Drum Castings

作　　者：邢程 XING Cheng(Yantai Winhere Auto-part Manufacturing Co.,Ltd.,Yantai 264006,China)

机构地区：[1]烟台胜地汽车零部件制造有限公司,山东烟台264006

出　　处：《现代铸铁》2022年第1期29-31,39,共4页Modern Cast Iron

摘　　要：介绍了灰铸铁刹车鼓铸件的结构,详细阐述了该铸件的原生产工艺及在安装面根部出现的缩松缺陷。通过多方面的原因分析和生产试验,认为单个边冒口补缩能力范围有限是导致小端内圆根部缩松的主要原因。采取了以下措施:去掉边冒口,将铸件主体由上箱翻转至下箱,利用铁液重力补缩;浇注系统由底注改为顶注,提高内浇道的流量,降低铁液流速,采用浇口杯和环形浇道对铸件进行分散、均匀补缩。生产结果显示:采用同时凝固方式,有效地消除了刹车鼓安装面根部缩松的缺陷,铸件成品率由89.72%提升至92.58%。The structure of gray iron brake drum castings was introduced.The original production technology of the castings and the shrinkage defects appearing at the root of the mounting surface were described in detail.Through a variety of reasons analysis and production tests,it was believed that the limited range of the feeding capacity of a single side riser was the main reason for the shrinkage on the small end inner circle root.The following measures were taken:the side riser was removed.The main body of the casting was turned from the upper box to the lower box,and the gravity was used for molten iron feeding.The gating system was changed from bottom injection to top injection to increase the flow rate of the inner runner and reduce the iron liquid flow rate.Sprue cups and annular runners were used to disperse and evenly feed the castings.The production results showed that the simultaneous solidification method had effectively eliminated the shrinkage on the root of the brake drum mounting surface,and the casting yield had increased from 89.72%to 92.58%.

关 键 词：灰铸铁 刹车鼓 缩松 同时凝固 

分 类 号：TG251[金属学及工艺—铸造]