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首页> 外文期刊>Archives of Foundry Engineering >Gases Emission From Surface Layers of Sand Moulds and Cores Stored Under the Humid Air Conditions
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Gases Emission From Surface Layers of Sand Moulds and Cores Stored Under the Humid Air Conditions

机译：潮湿空气条件下，砂模和型芯表面层释放的气体

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Abstract > A large number of defects of castings made in sand moulds is caused by gases. There are several sources of gases: gases emitted from moulds, cores or protective coatings during pouring and casting solidification; water in moulding sands; moisture adsorbed from surroundings due to atmospheric conditions changes. In investigations of gas volumetric emissions of moulding sands amounts of gases emitted from moulding sand were determined - up to now - in dependence of the applied binders, sand grains, protective coatings or alloys used for moulds pouring. The results of investigating gas volumetric emissions of thin-walled sand cores poured with liquid metal are presented in the hereby paper. They correspond to the surface layer in the mould work part, which is decisive for the surface quality of the obtained castings. In addition, cores were stored under conditions of a high air humidity, where due to large differences in humidity, the moisture - from surroundings - was adsorbed into the surface layer of the sand mould. Due to that, it was possible to asses the influence of the adsorbed moisture on the gas volumetric emission from moulds and cores surface layers by means of the new method of investigating the gas emission kinetics from thin moulding sand layers heated by liquid metal. The results of investigations of kinetics of the gas emission from moulding sands with furan and alkyd resins as well as with hydrated sodium silicate (water glass) are presented. Kinetics of gases emissions from these kinds of moulding sands poured with Al-Si alloy were compared.
机译：摘要 >砂型铸件中的大量缺陷是由气体引起的。气体有多种来源：浇铸和铸造固化过程中从模具，型芯或保护涂层中散发出的气体;以及型砂中的水;由于大气条件而从周围吸收的水分会发生变化。在研究型砂的气体体积排放时，到目前为止，取决于所浇铸的铸模所使用的粘合剂，砂粒，保护涂层或合金，确定了型砂排放的气体量。特此提出了对浇注液态金属的薄壁砂芯的气体体积排放进行调查的结果。它们对应于模具工件中的表面层，这对所获得铸件的表面质量至关重要。另外，岩心被存储在高空气湿度的条件下，由于湿度的巨大差异，来自周围的水分被吸附到砂模的表层中。因此，可以通过研究由液态金属加热的薄型砂层的气体排放动力学的新方法，来评估吸附的水分对模具和型芯表面层气体排放量的影响。给出了用呋喃和醇酸树脂以及水合硅酸钠（水玻璃）从型砂中释放气体的动力学研究结果。比较了用铝硅合金浇铸的这些型砂的气体排放动力学。

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