绝缘子用球墨铸铁附件内部孔洞成因分析及改进措施

Causes Analysis and Improving Measures of Internal Hole Existed in Nodular Cast Iron Accessory Used for Insulator

简述了绝缘子用球墨铸铁附件的重要性,对其缺陷的危害程度进行了说明,通过对球墨铸铁附件的解剖,针对解剖出的孔洞缺陷从原料、工艺、工装设备等方面进行了综合分析,得出孔洞缺陷是球墨铸铁附件壁厚变化显著和浇冒口设置不合理造成的,提出了改变浇冒口的形状数量及大小、控制浇注时铁液的温度,提高砂型的刚度的改进措施,消除了球墨铸铁附件的孔洞缺陷。

The article briefly introduces the importance of nodular cast iron accessory and states the harmfulness of its defects. Through dissection to the nodular cast accessory the internal hole defects are analyzed from such aspects as materials, technology and tooling equipment. The hole defect is caused by significant change of accessory thickness and the unreasonable installing of the sprue. The proposed improving measures are such as changing the sprue shape, quantity and size; controlling the temperature of iron liquor while pouring and increasing sand mould stiffness. Then the hole defects will be eliminated.