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砂型紧实的机械化和自动化应基于对其物理现象深入研究的资料。近年来大量著作阐述了压字法的优点,也述及其缺点,特别是砂型中紧度分布不均匀的问题。这些著作中推荐出一些参数的最佳值,但其数值和重要性却常相互矛盾。以压实比压为例,推荐的最佳值有5～6公斤/匣米~2,40～50公斤/厘米~2和更高一些,但却未考虑一般低压2～4公斤/厘米~2和超过100公斤/厘米~2的超高压。
The mechanization and automation of sand compacting should be based on in-depth study of its physical phenomena. In recent years, a large number of works elaborate on the advantages of pressure-lettering, as well as its shortcomings, especially the problem of uneven distribution of tightness in the sand. The best values for some parameters are recommended in these books, but their values and significance are often contradictory. To compaction ratio pressure, for example, the recommended best value of 5 ~ 6 kg / box meter ~ 2,40 ~ 50 kg / cm ~ 2 and higher, but did not consider the general low pressure 2 ~ 4 kg / cm ~ 2 and over 100 kg / cm ~ 2 ultra-high pressure.