精密鋳造に関する研究(その9)ワックスパターンに対する埋没材の硬化膨張の影響について

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  • Studies on the Accuracy of the Castings Part 9. Effects of the expansion caused by setting investment to deformation of the wax pattern

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In this report, the deformations of full crown type wax pattern invested with cristobalite investment were described. They were measured by means of wire strain gauges, which fixed to various positions of the pattern. They were invested in casting rings, sized 40 mm in diameter and length, lined with a sheet of dry Kaowool (a sheet of alumina-silica fibers) or wet asbestos ribbon. Results were follows; 1) The deformations caused by setting expansion of the investment come from not only the expansions but also the shrinkage pressing stresses, which were affected by the capacity of the cushion material. 2) The deformations were unsymmetrical, when the wax pattern was invested aside from the center of the ring. In this condition, a part of the wax pattern, even when it was situated on the center of the ring, was influenced by the deformation. 3) The dimensional change of the wax pattern was 4 microns in diameter, when the investment was mixed with standared water-powder ratio.

収録刊行物

  • 松本歯学

    松本歯学 5 (1), 27-34, 1979-06-30

    松本歯科大学学会

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