Bašistová Martina, Radkovský Filip, Kroupová Ivana, Lichý Petr
Department of Metallurgical Technologies, Faculty of Materials Science and Technology, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava, Czech Republic.
Materials (Basel). 2023 Feb 28;16(5):2004. doi: 10.3390/ma16052004.
The constant effort of all metal alloy manufacturing technologies and processes is to improve the resulting quality of the processed part. Not only the metallographic structure of the material is monitored, but also the final quality of the cast surface. In foundry technologies, in addition to the quality of the liquid metal, external influences, such as the behaviour of the mould or core material, significantly affect the cast surface quality. As the core is heated during casting, the resulting dilatations often lead to significant volume changes causing stress foundry defects such as veining, penetration and surface roughness. In the experiment, various amounts of silica sand were replaced with artificial sand and a significant reduction in dilation and pitting of up to 52.9% was observed. An important finding was the effect of the granulometric composition and grain size of the sand on the formation of surface defects from brake thermal stresses. The specific mixture composition can be considered as an effective prevention against the formation of defects instead of using a protective coating.
所有金属合金制造技术和工艺的持续努力都是为了提高加工零件的最终质量。不仅要监测材料的金相结构，还要监测铸件表面的最终质量。在铸造技术中，除了液态金属的质量外，外部影响因素，如铸型或型芯材料的性能，也会显著影响铸件表面质量。由于型芯在铸造过程中受热，由此产生的膨胀往往会导致显著的体积变化，从而产生诸如脉纹、渗透和表面粗糙度等铸造应力缺陷。在实验中，用人工砂替代了不同量的硅砂，观察到膨胀和麻点显著减少，降幅高达52.9%。一个重要发现是砂的粒度组成和粒度对制动热应力导致的表面缺陷形成的影响。特定的混合物组成可被视为一种有效的防止缺陷形成的方法，而不是使用保护涂层。
