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首页> 外文会议>Proceedings of the 11th Asian foundry congress >Investigation on sand burn-on formed on steel casting while imposing vacuum (depression) in sand mould
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Investigation on sand burn-on formed on steel casting while imposing vacuum (depression) in sand mould

机译：在铸模上施加真空（降低压力）的同时，铸钢件上形成的烧砂现象的研究

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摘要

Green sand mould remains the most popular process for the production of steel castings. However nature of sand and moulding operations renders the process prone to the appearance of variety of casting defects, and one of these is sand burn-on. In the present paper the relevant work done on sand burn-on in steel castings has been briefly collated and it is further extended to nature and causes of appearance of sand burn-on in sand mould (having some bonding material, molasses) on which vacuum ("depression" or negative pressure) has been imposed. It has been done by specially designed mould box, which is connected with vacuum pump (-1 kgf/cm2). The analysis of sand burn-on collected from the surface of test bar and its macro study show that it contains almost 2% oxides of iron and other oxides such as SiO2, MgO, CaO, Na2O, K2O. The material is loosely adhered with casting wall. This is due to the weak fayalite reaction (2FeO + SiO2 = 2FeOSiO2) because of continuous circulation of air from the pores of the mould and hot sand grains adjacent to the casting wall, and the temperature of the mould is lowered by 20%, decelerating the liquid steel - sand mould reactions. Further impregnating the active surface of mould with ethyl silicate, the hot strength of the mould is increased by 200% - 300% and reduces the volume of pores up to 60%. It decreases the possibility of metal penetration.
机译：绿砂模仍是钢铸件生产中最受欢迎的工艺。然而，砂子和成型操作的性质使该工艺易于出现各种铸件缺陷，其中之一是砂子烧伤。在本文中，已简要整理了有关钢铸件中沙烧的相关工作，并将其扩展到了具有真空的砂模（具有某些粘结材料，糖蜜）中沙烧的性质和原因。 （“压抑”或负压）。它是通过专门设计的模具盒完成的，该模具盒与真空泵（-1 kgf / cm2）连接。从测试棒表面收集的烧沙分析和宏观研究表明，它含有近2％的铁氧化物和其他氧化物，例如SiO2，MgO，CaO，Na2O，K2O。该材料松散地粘附在铸件壁上。这是由于微弱的铁铝沸石反应（2FeO + SiO2 = 2FeOSiO2）引起的，这是因为空气不断从模具的孔中循环以及邻近铸壁的热砂粒循环，并且模具的温度降低了20％，从而减速液态钢-砂模反应。用硅酸乙酯进一步浸渍模具的有效表面，模具的热强度提高了200％-300％，并减少了多达60％的孔体积。它减少了金属渗透的可能性。

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