OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 6 No. 4 2024 Ta b l e 2 Characteristics of Si500 photopolymer material under normal conditions Parameter Value Tensile modulus of elasticity (E), MPa 2.68 Ultimate strength (σ), MPa 78.1 Relative strain (ɛ), % 4.39 Bending strength (σ), MPa 65 Glass transition temperature (T), °C 61 Density in liquid state (ρ), g/cm3 1.1 Density in solid state (ρ), g/cm3 1.2 Fig. 3. TE model with sprue-feeding system 3) the direction of hot metal from thick-walled sections to thin-walled ones. After the master model was made for each TE, a model kit of SFS and a casting model from casting wax were formed using a silicone mold. The obtained wax models of the electrodes were connected with SFS. The wax TEs with SFS were then mounted in a mold and fi lled with gypsum. The mold was calcined to a temperature of 750 °C. After the mold cooled down to a temperature of 450 °C, the models were calcined in an induction crucible furnace, and then the castings were removed from the mold. The material used was foundry brass Cu-40 Zn-Pb. Master models as well as wax models and subsequent castings were measured on a Contura Carl Zeiss G2 three-axis CMM. Shape deviations and the magnitude of possible corrections were considered. The samples under study were mounted perpendicular to the plane of the table, and the displacements relative to the cross-section of the vertical and horizontal surfaces of the prototype were measured. Four surfaces were measured on each obtained TE. The measured surfaces and the measurement strategy are shown in Fig. 4. a b Fig. 4. Measured surfaces of the tool electrodes (a) and the trajectory of measuring the TE (b)
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