鋳物砂の凍結に関する研究-1-凍結砂の特性とその凍結挙動

概要

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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.
北見工業大学の論文
1972-12-00