ABSTRACT

Gas permeability of moulds and cores is an important factor to consider in the casting process. In foundries, gas permeability is measured by using instruments which give dimensionless numbers. This approach enables the comparison of values between samples and is often not quantified in units. In this study, a custom-made measurement system is introduced that applies Darcy’s law, where pressure gradients for different flow rates are studied. The Darcian permeability in standard cylindrical samples was determined using a method that is familiar with those in earth sciences. Two types, steady-state and unsteady-state approaches were used for the calculations, and the difference in permeability values generated by these two methods is discussed. The results of a silica sand sample with furan resin and a 3D-printed sample that consists of artificial granulous material with phenolic resin were compared.

摘要

模具和型芯的透气性是铸造过程中需要考虑的重要因素。在铸造厂，气体渗透率是通过使用提供无量纲数字的仪器来测量的。这种方法可以比较样本之间的值，并且通常不以单位量化。在这项研究中，引入了一个定制的测量系统，该系统应用了达西定律，研究了不同流速下的压力梯度。标准圆柱形样品的达西渗透率是使用地球科学领域熟悉的方法确定的。两种类型，稳态和非稳态方法用于计算，并讨论了这两种方法产生的渗透率值的差异。