Study of Influencing Factors on Properties of Wet Sand
As an important part of casting production,wet clay sand molding process plays an important role in production quality.The effects of water content,grinding time,dead clay,additives and bentonite on the properties of molding sand were studied.The results showed that when water content exceeded the water absorption capacity of bentonite,the strength and permeability of molding sand decreased and the compacting rate increased with the increase of water added.In a certain time range,with the extension of grinding time,the strength,air permeability and compacting rate increase,and the moisture formation can be detected at 105℃.In the case of excessive water content,adding proper amount of dead clay can improve the strength,but too much dead clay will cause the strength to decrease;Adding pulverized coal additives to molding sand can reduce compaction rate and hot wet tensile strength.The content of montmorillonite in bentonite will affect the properties of molded sand.
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