一、前言压实紧实是砂型最基本的紧实成型方法。为了在高压造型时获得均匀紧实的砂型,需要知道压实过程中型内砂粒的流动和紧实度变化的情况。对于这一问题,许多学者曾作过不少研究。关于压实紧实后,砂型内的紧实度分布,早在1935年阿克肖诺夫就提出了如图1的曲线。这一曲线列入了大学教科书中,为人所熟知。后来,波埃尼希等人所得压实后砂型 First, the preface Compaction Tightness is the most basic sand molding method of compaction. In order to obtain a uniform and compact sand shape during high-pressure molding, it is necessary to know the flow of sand and the change in compaction during the compaction process. Many scholars have done a lot of research on this issue. With regard to the compactness of compaction, the compaction distribution within the sand mold, as early as 1935, Akshenoff proposed the curve shown in Fig. This curve is included in university textbooks, is well known. Later, Bonnich et al. Obtained compacted sand shapes