METHOD FOR OBTAINING A DELETED MODEL OF A BODY OF REVOLUTION Russian patent published in 2021 - IPC B22C7/02 B22D13/00 

FIELD: mechanical engineering.

SUBSTANCE: invention relates to the field of mechanical engineering and can be used in the manufacture of an investment casting model. A method for obtaining a removable model of a body of revolution includes a metered supply of a mixture of a powder of a wax-like model composition and granules of ammonium nitrate into a shape in the form of a body of rotation and rotation of the said shape about its vertical axis. A mold with an inner radius of at least 3 cm is used, which is rotated at a frequency of 6000-15000 rpm. A mixture of powder of a waxy model composition and granules of ammonium nitrate is used with the following ratio of components, wt.%: waxy model composition of fractions of at least 0.4 mm - 90-99, ammonium nitrate - 1-10. Under the action of centrifugal force, the particles of the powder of the model composition are compacted on the inner surface of the mold without supplying heat and are displaced onto the outer surface of the model, filling the areas between the granules of ammonium nitrate, which makes it possible to obtain a model with the required roughness and geometry.

EFFECT: elimination of shrinkage, surface warping and layering of the model is ensured, which makes it possible to increase the dimensional and geometric accuracy of castings and the physical and mechanical properties of shell molds.

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