Finite Element Modeling of the Stress-Strain State of Waxy Compacts.

Mechanical processing of cast workpieces in the process of producing metal components having a complex structure and high dimensional and geometric accuracy requires significant energy and material costs, which can be reduced in case of using special types of casting. It is not possible to eliminate completely the mechanical processing of the workpieces due to the thermal characteristics of their production, such as shrinkage. To eliminate this demerit, we manufacture lost wax models by pressing wax-like powder model masses without preheating. It has been experimentally found that the accuracy of porous pressed models is 1 or 2 qualities higher than that of conventional smelted models. The elastic aftereffect of the material hinders the wide implementation of this process. This elastic aftereffect of the material leads to a smaller change in the geometry of the final product than when using the conventional process; however, it must be taken into account in designing molds. The final dimensions of the mold and the parameters of the process of making compacts from the material of a specific brand are determined predominantly during experiments. The magnitude of the elastic aftereffect depends on a number of rheological parameters of the process; therefore, the prediction of the stress-strain state of compacts from wax-like model compositions by means of mathematical calculations seems to be relevant. The paper presents the results of the stress-strain state modeling of compacts from a number of waxy-like materials using the finite element method in comparison with the results of the field experiments. This comparison allows us to obtain reliable data about real thermophysical processes occurring during the compaction of wax-like model compositions. This information is applicable in the practice of obtaining pressed smelted models of high dimensional and geometric accuracy. [ABSTRACT FROM AUTHOR]