一、问题的提出和有关文献资料评述紧实度均匀是保证砂型质量的一个重要方面。紧实方法和型砂的有关性能是影响砂型均匀紧实的两个主要因素。二者对砂型的紧实过程,既有不同的作用,又互相有影响。因此,在研究型砂的紧实作用时,也必须研究型砂性能对均匀紧实的影响。这一与均匀紧实有关的型砂性能,本文中称之为型砂的匀实性。 First, the issue put forward and comments on the literature The uniform degree of compactness is to ensure an important aspect of sand quality. The tightness method and the relative properties of the sand are the two main factors that influence the even compactness of the sand. Both of the sand compacting process, both have different roles, but also affect each other. Therefore, in the study of the compaction of sand, it is also necessary to study the effect of sand on uniform compaction. This uniform and compact sand-related properties, in this article called the uniformity of sand.