论文部分内容阅读
研究了不同的壳型铸造用纱,湿型砂和原砂的发气量与灼烧减量试验结果之间的关系,可使铸造厂大致在2、3分钟内确定出灼烧减量,而不用象现在这样花2、3小时才能测出灼烧减量。根据目前的统计控制程序,铸造厂需定期地对其所用砂料进行测定和控制,要求将砂样加热至1850F(1010℃)并至少保持2小时,因此程序需时长,铸造厂对调整混砂设备的适应性大为降低。采用发气量确定砂子可燃物含量(灼烧减量)的方法,铸造厂能很有效地测定出配有氧化物(诸如铬铁矿、橄榄石矿及铁)的砂料中可燃物含量。因为测定是在氮气保护下进行的,氧化反应无法进行。
The relationship between the gas evolution of different shell casting yarns, wet sand and virgin sand, and the results of the ignition reduction test was investigated, allowing the foundry to determine the ignition loss in approximately two or three minutes without using It takes 2, 3 hours to measure the ignition loss now. According to current statistical control procedures, the foundry needs to periodically measure and control the amount of sand it uses, requiring that the sample be heated to 1850F (1010 ° C) for a minimum of two hours, so the process takes a long time. The adaptability of the equipment is greatly reduced. Using the method of determining the combustible content (loss on ignition) of the sand gas, the foundry can very effectively determine the combustibles content in the sand with oxides such as chromite, olivine and iron. Because the determination is carried out under nitrogen, the oxidation reaction can not be carried out.