Influence of melting conditions of aluminum alloys on the properties and quality of castings obtained by lost foam casting
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The development of modern foundry production is characterized by a constant increase in requirements for the quality of fabricated casting and rational use of material resources, which determines the search for new technical and process solutions, making it possible to acquire the required properties of cast wares along with resource saving. Herewith, the question of revelation and investigation into the regularities of the influence of thermal-temporal parameters of smelting and pouring of aluminum alloys into the casting mold during the lost foam casting on tightness and mechanical and qualitative characteristics of thin-wall castings remain poorly known and complex for implementation, especially allowing for the performance of resourcesaving measures. In this publication, the influence of process parameters of smelting on the strength, tightness, and content of nonmetallic inclusions in castings of the gas-analyzer case made of AK7 alloy during the lost foam casting is considered. The data set acquired based on the experimental investigations has been subjected to statistical processing. The use of statistic models makes it possible to acquire the results of the influence of the holding time and content of secondary materials in the charge on strength and tightness of mentioned castings. The results of an investigation into the influence of holding the AK7 melt at the overheating temperature of 880–890°С on the content of nonmetallic inclusions in castings show that it can be regulated varying the holding time. This procedure decreases the melt microinhomogeneity and provides the acquisition of numerous castings with a minimal content of nonmetallic inclusions.
Keywordscasting aluminum alloy melt overheating lost foam models strength tightness melt holding time secondary materials nonmetallic inclusions
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- 2.Tikhomirova, I.M. and Klemenyuk, E.V., Development of manufacturing technology of casting using foam lost casting, Lit’e Metall., 2013, no. 3S (72), pp. 132–137.Google Scholar
- 4.Deev, V.B., Ponomareva, K.V., and Yudin, A.S., Investigation into the density of polysterene foam models when implementing the resource saving fabrication technology, Russ. J. Non-Ferrous Met., vol. 56, no. 3, pp. 283–286.Google Scholar
- 7.Isagolov, A.Z., Kulikov, V.Yu., Laurent, C., Tverdokhlebov, N.I., and Shcherbakova, E.P., Improvement of casting by lost foam models, Liteinoe Proizvod., 2014, no. 4, pp. C. 16–18.Google Scholar
- 15.Pacyniak, T., Effect of refractory coating in the Lost Foam Process, Arch. Foundry Eng., 2009, no. 9 (3), pp. 255–260.Google Scholar
- 16.Sharifi, A., Mansouri, Hasan Abadi M., and Ashiri, R., Direct observation of effects of foam density, gating design and pouring temperature on mold filling process in lost foam casting of A356 alloy, in: Proc. TMS Middle East—Mediterranean Materials Congr. on Energy and Infrastructure Systems, MEMA, 2015, pp. 109–118.Google Scholar
- 22.Pacyniak, T., The effect of refractory coating permeability on the Lost Foam process, Archiv. Foundry Eng., 2008, no. 8 (3), pp. 199–204.Google Scholar
- 26.Ten, E.V., Rakhuba, E.M., Kimanov, B.M., and Zholdubaeva, Zh.D., Resources for increase in refining capacity of filters for liquid metals, Liteishch. Ross., 2013, no. 11, pp. C. 38–42.Google Scholar
- 28.Nikitin, V.I. and Nikitin, K.V., Nasledstvennost’ v litykh splavakh (Heredity in Cast Alloys), Moscow: Mashinostroenie- 1, 2005.Google Scholar
- 34.Prusov E.S., Panfilov A.A. Influence of repeated remeltings on formation of structure of castings from aluminium matrix composite alloys, in: Metal 2013: Proc. 22nd Int. Conf. on Metallurgy and Materials, 2013. no. 1, pp. 1152–1156.Google Scholar
- 35.Deev, V.B., Ponomareva, K.V., Prikhodko, O.G., and Smetanyuk, S.V., The effect of overheating temperature and melt pouring temperature on the aluminum alloy casting quality in lost foam casting, Russ. J. Non-Ferrous Met., 2017, vol. 58, no. 4.Google Scholar