有機系自硬性鋳型の鋳型壁移動の発生傾向

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この研究の目的は，鋳物砂に発生する鋳型壁移動の発生機構とその防止策を解明することである。そこで，有機系自硬性鋳型に関して，これらの鋳型の粘結剤である樹脂や硬化触媒の種類を変えて，高温圧縮試験及びばく熱加圧試験を行ない，無機系自硬性鋳型と比較することにより，有機系自硬性鋳型の鋳型壁移動の発生傾向を調査した。得られた結果は次のとおりである。(1)加熱温度が上昇すると，また圧縮応力が増すと，変形率は大きくなる。(2)フラン系樹脂を粘結剤とする鋳型においては，フラン樹脂の純度の高いほど，変形率は小さくなる。(3)フラン系樹脂を粘結剤とする鋳型においては，硬化触媒の種類によって変形率や圧縮強度が変わる。(4)有機系自硬性鋳型の変形率は，無機系自硬性鋳型のそれよりも小さい。また，これらの高温圧縮試験及びばく熱加熱試験の結果と，すでに得られている無機系自硬性鋳型の鋳型壁整動から(5)有機系自硬性鋳型の鋳型壁移動は，無機系自硬性鋳型のそれよりも小さいと推測される。The objection of the present investigation is to elucidate the mechanism and causes of the movement of sand mold wall to find out methods for it prevention. High temperature compressive and shock heating tests were performed to study the influences of various factors which caused mold wall movement in the organic self-curing sand. The following factors were studied; the kind of resin and curing agent and the kind of binder. Results obtained are follows; (1) The ratio of sand deformation was more greater with elevating temperature and increasing compressive stress. (2) In the mold which furan resin as binder is used, the ratio of sand deformation was decreased with the higher purity of resin. (3) In the mold which furan resin as binder is used, the ratio of sand deformation and the compressive strength of sand were varied in case the different curing agents were used. (4) The ratio of sand deformation in the organic self-curing mold was more smaller than that of the inorganic self-curing mold. And judging from these results and the data which were obtained by previous pouring tests on the cement bonded mold and sodium silicate bonded mold. (5) It was supposed that the tendency of the mold wall movement in the organic self-curing mold was smaller than that of the inorganic self-curing mold.
津山工業高等専門学校の論文

著者

里吉昭宣
Tsuyama National Coll. Technology

有機系自硬性鋳型の鋳型壁移動の発生傾向

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