精密鋳造に関する研究その8.有限要素法による鋳型の熱変形の解析

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  • Studies on the Accuracy of the Castings Part 8. On the analysis of the thermal deformation of the mold by means of the finite element method

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Thermal deformation of the mold was studied by means of the finite element method. The mold was prepared with phosphate or gypsum bonded investments, lined with a sheet of silica-alumina fiber or asbestos ribbon. Results were follows; 1. Mold lined with a sheet of silica-alumina fiber, was expanded without deformation. This result obtained from any kinds of investments and any variations of the mold form. 2. Mold prepared with phosphate bonded investment, was expanded similarly to its original form during heat. 3. Full crown type mold, prepared with gypsum bonded investment and lined with asbestos ribbon, was deformed by heating. In this mold, the inside part of the occusal surface was spread out more than the inside marginal part. The outside was shrinked by thermal expanding pressure with cocave deformation. 4. Bridge type mold, prepared with gypsum bonded investment and lined with asbestos ribbon, was deformed by heating. The mold of the dummy was not changed through thermal expansion. But the inside diameter of the crown was enlarged. The inside marginal wall of the crown neighbored to the dummy was expanded smaller than the inside occulusal wall, but the oposite wall was expanded similarly.

収録刊行物

  • 松本歯学

    松本歯学 4 (2), 138-149, 1978-12-31

    松本歯科大学学会

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