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pISSN : 1598-706X / eISSN : 2288-8381


한국주조공학회지 (4권1호 12-20)

The study on the mixing character of synthetic molding sand by power change

혼사전력 변화에 의한 합성사의 혼련특성에 관한 연구

Young-Sik Kim*, Jeong-Yeon Jeong*, Jong-Nam Lee**

*Graduate School of Korea University, **Korea University


In order to investigate the effect of size of sand grains, bentonite content and moisture on mixing power, standard mixing power, permeability, green compressive strength and green mold hardness were measured with mixing time, and also coated layer of mixed sand with time was observed by optical microscope and scanning electron microscope. From this experiment, the results were summarized as follows. 1. Mixing power increased as size of sand grains decreased. 2. Mixing power increased gradually as bentonite content increased and in particular, increased rapidly in 7-10% bentonite. 3. Mixing power increased as moisture content decreased. 4. The mixing time required to get the optimum mixing power decreased as moisture content and grain size increased, but increased as bentonite content increased.