On assessing the influence of the degree of coverage of a spherical ceramic shell by the supporting filler and preliminary calcination on the level of stress in the mold material during pouring and hardening of the casting in it
Abstract:
Thermal stresses in a spherical ceramic shell mold are calculated during the process of pouring and solidifying the metal. The corresponding problem of the theory of temperature stresses in elastic materials is formulated and solved. The variable parameters of the problem are the degree of heating (calcination) of the shell mold and the height of its seating in the support filler (SF). The dependence of elastic moduli on temperature is neglected. As contact conditions at the boundary of the contacting metal with the inner surface of the mold, the equality of stresses normal and tangential to the boundary surface is taken. OH is assumed to be non-deformable, its contact with the shell-shaped material is assumed to be rigid. There is a slight increase in the level of stress in the mold due to the presence of the supporting filler and a noticeable influence on it from its preliminary heating.
Keywords:elasticity, temperature stresses, lost wax casting, shell form.
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