【摘要】 对熔模精铸球铁技术进行了研究和试验 ,重点对熔炼、浇注及冷却过程进行了试验 ,确定了较合理的工艺参数。经试验 ,蜡模压型的铸造收缩率可在 0 .5 %～ 1.2 %之间选择 ;型壳采用硅溶胶 水玻璃复合粘结剂工艺 ;球铁的化学成分按C、Si含量较高 ,Mn、S、P含量较低的原则确定。经批生产考核 ,精铸球铁铸件的金相组织可达到球化级别 2级 ,石墨球大小6级 ,珠光体含量 10 %的要求。铸件力学性能也满足使用要求。更多还原

【Abstract】 Experiments of nodular iron in investment casting were conducted, focusing on smelting, pouring and cooling processes.The proper technological parameters were determined. The experimental results showed that the casting shrinkage ratio of wax pattern die can be selected in the range of 0.5%～1.2%. The silica sol-sodium silicate compound binder was used for shell mold. The chemical composition choice of nodular iron preferred higher C, Si contents and lower Mn, S, P contents. Some batches of production showed that microstructure of nodular iron in investment casting can reach to 2 grade nodularization, 6 grade nodule size and 10% pearlite. The mechanical properties can meet the performance requirements.更多还原