PSI - Issue 40

Nina A. Bogdanova et al. / Procedia Structural Integrity 40 (2022) 70–74 Nina A. Bogdanova at al. / Structural Integrity Procedia 00 (2022) 000 – 000

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Analysis of the data provided in Figure 1 and Tables 1 and 2 shows that the bulk density of the mixture components has the most significant influence on the compression molding process. It is obvious that the higher the bulk density, the higher are the stresses required for compression of a single-component waxy investment compound. As the ram travels during compaction of investment compounds containing incompressible elastic elements (packing cases d and e), the fraction of the waxy mass deformed increases in relation to the decreasing volume of the mold cavity. As a consequence, the stresses increase in the course of the compaction of such investment compound and it becomes obvious that as the content of elastic elements in the investment composition increases, the stresses required for deforming the entire multi-component powder body rise. 4. Conclusion Thus, the rise in stresses during compression of a waxy-investment-material compact in a closed mold die de pends on the ram velocity and initial packing of the spherical elements which influences the bulk density value of the powder body prior to compaction of the latter. The stresses are higher for compression of a material with a higher elastic modulus (packing with addition of non-deformable elastic elements) than in case of a material with a lower elastic modulus (single-component investment compounds). The stresses required for compression of a compact rise as the ram velocity increases. It has been determined that the minimum values of the stresses arising during deformation of a powder body are Ϭ 0.5 = 0.42 MPa, which corresponds to loose placement of spherical waxy elements in the mold die at the ram velocity of 0.5 mm/s. It has been established that the maximum values of the stresses arising during deformation of a powder body are Ϭ 3 = 0.81 MPa, which corresponds to hexagonal placement of spherical waxy elements in the mold die at the ram velocity of 3 mm/s. Acknowledgements The study was performed as part of the state assignment of the Khabarovsk Federal Research Center of the Far Eastern Branch of the Russian Academy of Sciences. References Begun A.S., Kovtanyuk L.V., Burenin A.A., Lemza A.O. On the Mechanisms of Production of Large Irreversible Strains in Materials with Elastic, Viscous and Plastic Properties. Archive of Applied Mechanics (Ingenieur Archiv). 2020. Vol. 90. No. 4. pp. 829 – 845 GOST 1050-2013. Metal Products from Nonalloyed Structural Quality and Special Steels. General Specification. Effective Date 2015-01-01. M: Standartinform, 2014. 31 p. Medvedev Ya.I., Valisovskii I.V. Technological Tests of Molding Materials. Moscow: Mashinostroenie, 1973. 312 p. Nastac L., Gungor M.N., Ucok I., Klug K.L., Tack W.T. Advances in Investment Casting of ti-6al-4v Alloy: a review. International Journal of Cast Metals Research. 2006. Vol. 19. No. 2. pp. 73-93 Nikiforov S.A., Nikiforova M.V. Economic Assessment of the Quality of Investment Casting Process Casting and Metallurgy. 2012. No. 3 (66). pp. 89 – 90. Garanin V.F., Ivanov V.N., Kazennov S.A. et al.; edited by Ozerov V.A. Investment Casting. Moscow: Mashinostroenie, 1994. — 448 p. Sadovskiy V.M., Sadovskaya O.V. Analyzing the Deformation of a Porous Medium with Account for the Collapse of Pores. Journal of Applied Mechanics and Technical Physics. 2016. Vol. 57. No. 5 (339). pp. 53 – 65 Sosnin A.A., Bogdanova, N.A., Zhilin, S.G., Komarov, O.N. Finite Element Modeling of the Stress-Strain State of Waxy Compacts. AIP Conference Proceedings, 2019, 030017. Yusipov R.F., Demyanov E.D., Vinogradov V.Yu., Paremskiy I.Ya., Airapetyan A.S. Method for Assessing the Surface Quality of the Facing Layer of an Investment Casting Mold. Foundry. 2021. No. 8. pp. 23 – 26. Zhilin, S.G., Bogdanova, N.A., Komarov, O.N., Sosnin, A.A. Decrease in the Elastic Response in Compacting a Paraffin – Stearin Powder Composition. Russian Metallurgy (Metally), 2021, 2021(4), pp. 459 – 463 Zhilin, S.G., Komarov, O.N., Bogdanova, N.A. Production of the Steel Casting with Improved Dimensional and Geometrical Accuracy Using Complex Models. IOP Conference Series: Materials Science and Engineering, 2020, 709(3), 033104 Zhilin, S.G., Komarov, O.N., Bogdanova, N.A. Technological Aspects of Formation of Bimetallic Castings of High Dimensional and Geometrical Accuracy. AIP Conference Proceedings, 2020, 2310, 020362 Zhilin S.G. Influence of the Initial Packing of the Components of the Powder Body on the Stress-Strain State of the Pressing During Compaction. Scholarly Notes of Komsomolsk-na-Amure State Technical University. 2018. Vol. 3 (35). pp. 73 – 79.