流動自硬性砂の水分の挙動と鋳造欠陥

概要

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The primary moisture content of fluid self-hardening mixture is higher than that of self-hardening sand or CO2 sand. It is said that the mold made of fluid self-hardening mixture contains a large number of bubbles by which permeability is high in spite of high humidity. Therefore, the mold is used without drying. However, our experience shows that pouring defects due to the mold moisture often appears. This report is a study on the behaviour of mold moisture and method of prevention of pouring defects for fluid self-hardening mold. The results obtained were summarized as follows; 1) When the fluid self-harding mold was left indoors, only the moisture contained in the surface layer was eliminated. 2) The compressive strength and permeability increased rapidly as moisture in mold was eliminated. 3) Pouring to the frozen metal within 24 hours of molding may cause deformation of the setting core by the pressure of the molten metal or scab formation, therefore, it is desirable that pouring is conducted after leaving the mold for 24 hours.
Japan Foundry Engineering Societyの論文