著者

片島 三朗 田島 俊造 小竹 伸典

出版者

公益社団法人 日本鋳造工学会

雑誌

鋳物 (ISSN:00214396)

巻号頁・発行日

vol.53, no.6, pp.289-294, 1981-06-25 (Released:2012-02-16)

参考文献数

5

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Hot sand is produced with the systematization and speeding up of the casting line and is causing various problems. The relationship of compression strength, permeability, compactability and surface stability to sand temperature under various conditions was clarified, and variance of the properties of the hot sand when left to stand for given periods of time in air was also determined. A laboratory mixer was improved to enable high precision mixing of hot sand of the desired temperature. It was comfirmed that there is almost no change in the properties of the sand itself, but it was found that care must be taken because the values of permeability and compactability, when dealt with by the usual method, turn out to be altogether different from what they really are. Further, the importance of sand control from the time of mixing until molding has been confirmed, for, when the hot sand is left to stand in air, the variance becomes great, especially when the moisture is low (less than 3%) due to elevation of the temperature of the sand and prolongation of the time it is left standing.