pressing, wax-like material, porosity, deformation, residual stresses, time of relaxation, dimensional and geometric accuracy, elastic response, two-parameter dependence of Kohlrausch.

The achievement of the final dimensions and characteristics of the pressing is largely determined by the properties of the original materials, the degree of deformation, and residual stresses in the compacted body after load removal. Since wax-like materials are mainly not construction materials, information about the stress-strain state of the pressing obtained from them is not quite enough to predict the final properties and sizes of the latter. The relevance of research in this direction is due to the use of the processes of forming pressed foundry models from wax-like compositions used in investment casting. The surface of such pressing is characterized by the absence of thermal shrinkage defects. However, in some cases, the geometry of the pressing changes as a result of relaxation of the compacted material. The results of researches of effect of the fraction of the wax-like material and its exposure time in the loaded state on the value of residual stresses that can be used in the design of molds are presented in the paper.

Zhilin Sergey Gennadevich, Ph. D. in Engineering Sciences, Assoc. Prof., Leading Researcher, Institute of Machinery and Metallurgy FEB RAS, Komsomolsk-on-Amur, Russia.

Bogdanova Nina Anatolievna, Junior Researcher. Institute of Machinery and Metallurgy FEB RAS, Komsomolsk-on-Amur, Russia

Komarov Oleg Nikolaevitsch, Ph. D. in Engineering Sciences, Assoc. Prof., Leading Researcher, Institute of Machinery and Metallurgy FEB RAS, Komsomolsk-on-Amur, Russia.