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A Study on Freezing of Molding Sand（Part 1） ?Characteristics of frozen sand and its freezing behavior ?

机译：型砂冻结研究（一）：冻结砂的特性及其冻结行为

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摘要

Results from the questionaire about the foundry shops in Hokkaido confirmed that　great interest was focussed on the problem of freezing of molding sand.　In the past no scientific　research about this problem was performed， so fundamental　experiments have been carried out to obtain the characteristics of frozen sand and its　freezing behavior.　Some interesting results were obtained　and　indicated that　the characteristics of　frozen sand should be positively utilized　for casting mold in the future.　They are as follows :　　1）Frozen sand　becomes harder than the natural one and stronger in compression and shearing. Permeability is also better than that of natural sand，especially in frozen　sand before ramming.　　　2）In the cooling curve can be recognized the flat part which shows the interval　of constant temperature. The length　of　this part becomes longer according　to　the　moisture content and is changed by the kinds of constitution of molding sand.　　　3）Deformation　of frozen sand rammed　in　the test　piece shows　an　interesting　behavior :　expansion or contraction. This behavior is almost similar to that of hot　heated sand.
机译：关于北海道铸造厂的问卷调查结果证实，“极大的兴趣集中在型砂的冻结问题上”。过去没有对该问题进行科学研究，因此已经进行了基本的实验来获得冻沙的特性及其冻结行为。获得了一些有趣的结果，并表明，将来应积极利用“冻砂”的特性来铸造模具。它们如下：1）冻砂比天然砂更硬，压缩和剪切力更强。渗透率也比天然砂好，尤其是夯实前的冷冻砂。 2）在冷却曲线上，可以看到平坦的部分，显示出恒温区间。该部分的长度根据水分含量而变长，并根据型砂的构成而改变。 3）在试验件上夯实的冷冻砂的变形显示出一种有趣的行为：膨胀或收缩。这种行为几乎类似于热砂的行为。

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