球墨铸铁摇臂铸件常见缺陷的防止

Prevention of Common Defects of Nodular Iron Rock Arms

分析了球墨铸铁摇臂碳化物和硬度偏高、皮下气孔以及试棒伸长率偏低等常见缺陷的产生原因,并提出解决措施。主要有:提高浇注温度,控制浇注时间、型砂水分、锰量和残余镁量,强化孕育,延长试棒开型时间等。

The resons causing the common defects of nodular iron rock arms such as carbide content and hardness to high, pin hole as well as elongation of the test bar too low were analyzed, and the measures to prevent these defects were proposed including: increasing pouring temperature, controlling pouring time, sand moisture, manganese and magnesium contents, intensifying inoculation, lengthening knock-out time of the test bar and so on.