生产球铁磨球铁型覆砂层厚度的研究

Study on Thickness of Coated Sand in Production of Ductile Iron Grinding Ball with Sand-Coated Iron Mold

铁型覆砂生产球墨铸铁磨球工艺中,覆砂层的厚度是一个重要的参数。利用华铸CAE软件,在固定磨球成分、铁型厚度、温度和覆砂层温度的前提下,对Φ120 mm磨球不同的浇注温度、覆砂层厚度进行了模拟,通过分析不同参数下不同覆砂层厚度的凝固温度梯度、温度曲线和缩孔、缩松倾向,得出生产Φ120 mm磨球时覆砂层厚度应选择3-8 mm,不宜超过9 mm,浇注温度不宜低于1 320℃。

The thickness of coated sand is a key parameter in production of the ductile grinding ball with sand-coated iron mold.The effects of pouring temperature and thickness of coated sand on the Φ120 mm grinding ball were simulated when the composition of the melt,the thickness and temperature of the iron mold and the temperature of the coated sand were fixed.The solidification temperature gradient,temperature curves and shrinkage,dispersed shrinkage trend of the grinding ball with different thickness of coated sand and pouring at different temperature were analyzed.The optimal parameters were obtained,i.e.the thickness of coated sand is 3-8 mm,and not more than 9 mm and the pouring temperature is above 1 320 ℃.