生型再生砂を使用したでんぷん乾燥鋳型の諸性質

概要

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As the effectiveness and advantage of repreated use of starch mold have been clarified, in the present work the properties of starch-added core, which are made from rebonded sand from green sand mold, bentonite and shell core sand, were examined. And also, recycling of rebonded sand from green sand mold which amount has increased by use of shell core sand, and its effective use for starch core sand were examined. The rebonded sand included residual bentonite and carbon, then its green sand strength was above 0.1kgf/cm2. Further, it had higher hot strength than the mold consisted of fresh silica sand and starch phosphate. This results from the reaction of the residual bentonite and starch phosphate at high temperature to from heat resistant substance of aluminum phosphate. Surface stability of the mold was excellent, the thermal contraction ratio was below 0.4%, and the addition of a small amount of zircon flour improved the thermal contraction ratio and thermal expansion ratio. These results confirmed that the rebonded sand from green sand mold can be satisfactorily used as the raw material for the starch core.
Japan Foundry Engineering Societyの論文