CALCULATION OF CYLINDRICAL MOLDS UNDER COMPLEX LOAD

KHUDOLEY Andrei L., Ph. D. in Eng., Head of High-precision Surfacing Laboratory, A.V. Luikov Heat and Mass Transfer Institute of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

BARAN Volha A., Senior Researcher of the Laboratory of Agricultural Engineering Science, Joint Institute of Mechanical Engineering of the National Academy of Sciences of Belarus, Minsk, Republic of Belarus, This email address is being protected from spambots. You need JavaScript enabled to view it.">This email address is being protected from spambots. You need JavaScript enabled to view it.

Strength calculation of steel cylindrical molds under complex load (internal represented, heating and centrifugal forces and axes load) that are heated to 800–1200 °С temperature is utilized. Application of this method allows avoiding a geometry changing and prevents the defects in the manufactured product by limitation of the technological parameters of manufacturing processes. Dependences for calculation of tension and deformations of casting molds with the correction coefficient are utilized on the basis of the principles of superposition, the principles of thick-walled cylinder theory and rapidly rotating disk developed by V. Feodosyev, calculation theories of short (Krylov’s function) and long shells. The correction coefficient should be defined on the basis of experimental data about molds irreversible deformations. Utilizing the correction coefficient allows increasing by 3–5 % the accuracy of calculations of radial displacement for casting molds. The method for calculation of the limited axial load of cylindrical molds that are loaded by internal pressure, heating and centrifugal forces is offered. The received dependences allow estimating influence of geometrical and technological parameters on the limited axial load. The example of calculation of the limited axial load for the cylindrical shell with an external diameter from 30 to 500 mm under complex load is given. It is established that 25 times increasing shell thickness caused 35 times magnification limits of axial load in a predetermined range of loads. The full-scale experiment for steel molds at the process of centrifugal induction surfacing is performed. Analytical dependences are recommended for determination of strength and geometrical parameters of the cylindrical molds for manufacturing bimetallic parts used at industrial processes of coaxial welding, sintering, heat treatment, centrifugal casting and surfacing.

casting mold, cylindrical shell, strength, heat treatment, complex loading, elastic-plastic state

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