CASTING MULTILAYER SHELL MOULD Russian patent published in 2024 - IPC B22C9/04 

FIELD: foundry.

SUBSTANCE: multilayer shell mould for production of spherical metal castings by investment patterns comprises thin-wall facing, inner intermediate and external outer layers. Facing layer is made using materials, the plastic properties of which to dampen normal compressive stresses in it when exposed to liquid metal temperatures are higher than the above properties of the materials of the intermediate and external layers.

EFFECT: increasing crack resistance during pouring of liquid metal and the beginning of cooling of the solidifying casting.

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