轮毂类球铁件缩孔缩松缺陷的形成机理及防治措施

The Investigating on the Forming Mechanism and Preventing Measures of Shrinkage and Porosity in the Ductile Hub Castings

本文以Transit汽车前桥轮毂铸件为例,针对小型轮毂球铁件产生缩孔缩松缺陷现象,采用计算机模拟技术模拟铸件的温度场,进行铸件孤岛检测,分析缩孔缩松缺陷产生过程,并用多通道数据采集器测定铸件凝固过程中温度场的分布特点,分析研究了此类铸件产生缩孔、缩松缺陷的机理,对消除铸件缩孔、缩松缺陷的工艺方法进行了讨论。实验研究结果表明,在铸件凝固过程中,保持补缩通道畅通是消除小型球铁轮毂缩孔缩松缺陷的关键,并提出小型球铁件的浇、冒口系统设计应遵循“直接补缩,顺序凝固”的设计原则。

The forming mechanism of shrinkage and porosity of the hub castings in the'Transit' car have been investigated by computer simulating and temperature measuring of during the casting solidified. The authors have discussed the methods of preventing shrinkage and porosity of the hub casting and put forward a idea of 'direct fed, progressive solidified' for the design principle of gating and riser system in small ductile iron castings.