Research and Application of Materials Science

Research on the Impact Behavior of Molten Metal on the Mold Shell in Gravity Casting of Large Titanium alloy Castings

ZHUXiaoping, ZHUChunlei, LINBaosen, WANGZidong

Abstract


The impact behavior of molten metal on the mold shell in gravity casting of large titanium alloy castings by investment precision castings was studied. The physical and mechanical models of the impact of molten metal on the mold shell during the pouring process were constructed using numerical simulation. The effects of molten metal pouring rate and pouring weight on the maximum impact force of the mold shell were studied. The research results indicated that during the entire pouring process, the impact force of the first molten metal contacting the mold shell was higher than subsequent molten metal. The maximum impact force increased with the increase of pouring rate and pouring weight. The total impact force of the molten metal on the mold shell was composed of the instantaneous impact force converted from instantaneous impulse and itself gravity. The instantaneous impact force of the molten metal that first impacts the mold shell was much greater than its own gravity, while the impact force of the molten metal at the end of pouring was much less than its own gravity. The maximum impact force on the mold shell of a large casting with a pouring weight of 800kg was about three times higher than that of a medium-sized casting with a pouring weight of 80kg.The difference in the total impact force on the mold shell between them mainly comes from the instantaneous impact force converted from instantaneous impulse.

Keywords


impact force; mold shell; pouring rate; pouring weight; instantaneous impulse

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References


Suzuki N. Recent progress of investment casting technology [J]. DENKI-SEIKO, 1989, 60:53-58.

Singh S, Singh R. Precision investment casting: A state of art review and future trends [J]. Proceedings of the Institution of mechanical engineers part B journal of engineering manufacture, 2015:0954405415597844.

Pattnaik S, Karunakar D B, Jha P K. Developments in investment casting process—A review [J]. Journal of Materials Processing Tech, 2012, 212(11):2332-2348.

Zheng Y H, Wang Z D. Development of casting process for thin walled complex-precision aluminum alloy castings [J]. Foundry, 2010, 59(8):796-799.

Yang G Y, Jie W Q, Hao Q T, et al. Study on process of magnesium alloy investment casting [J]. Materials Science Forum, 2007, 561/565:1019-1022.

Tao P, Shao H, Ji Z, et al. Numerical simulation for the investment casting process of a large-size titanium alloy thin-wall casing[J]. Progress in Natural Science, 2018, 28(4):520-528.

Kunal K, Ramachandran R, Norman M. Advances in gamma titanium aluminides and their manufacturing techniques [J]. Progress in Aerospace Sciences, 2012,55:1-16.

Kanyo J E, Schaffner S, Uwanyuze R S, et al. An overview of ceramic molds for investment casting of nickel superalloys [J]. Journal of the European Ceramic Society, 2020, 40(15): 4955-4973.

Venkat Y, Choudary K R, Das D K, et al. Ceramic shell moulds for investment casting of low-pressure turbine rotor blisk [J].Ceramics International,2021,47(4):5663-5670.

Williams J, Edgar A. Progress in structural materials for aerospace systems [J]. Acta Materialia, 2003, 51(19):5775-5799.

Jones S, Yuan C. Advances in shell moulding for investment casting [J]. Journal of Materials Processing Technology, 2003, 135(2-3):258-265.

Yu Y. The effects of different types of investments on the alpha-case layer of titanium castings [J]. The Journal of Prosthetic Dentistry, 2007, 97(3):157-164.

Chamorro X, Herrero-Dorca N, Andrés U, et al. α-Case formation in Ti-6Al-4V investment casting using ZrSiO4 and Al2O3 moulds [J]. Journal of Materials Processing Technology, 2017, 243:75-81.

Cheng X, Yuan C, Shevchenko D, et al. The influence of mould pre-heat temperature and casting size on the interaction between a Ti–46Al–8Nb–1B alloy and the mould comprising an Al2O3 face coat[J]. Materials Chemistry & Physics, 2014, 146(3):295-302.

Lu G, Chen Y, Yan Q, et al. Carbon-nylon hybrid fibers modified silica solid shell with enhanced flexural strength and heat transfer for investment casting [J]. Journal of the European Ceramic Society, 2022，42(8):3624-3633.

K Lü, Liu X, Du Z, et al. Properties of hybrid fiber reinforced shell for investment casting [J]. Ceramics International, 2016:15397-15404.

Syverud M, Her H. Mold filling of Ti castings using investments with different gas permeability [J]. Dental Materials, 1995, 11(1):14-18.

Sullivan N O, Mooney J, Tanner D. Enhancing Permeability and Porosity of Ceramic Shells for Investment Casting through Pre-wetting [J]. Journal of the European Ceramic Society, 2021, 41(16):411-422.

Wang F, Li F, He B, et al. Microstructure and strength of needle coke modified ceramic casting molds [J]. Ceramics International, 2014, 40(1):479-486.

William F. Waterdrop impact modeling [J].Wear, 1995, 186–187:341-351.

Calderón-Sánchez J, Duque D, Gómez-Goñi J. Modeling the impact pressure of a free falling liquid block with OpenFOAM. Ocean Engineering, 2015, 103:144-152.

Hoksbergen T H, Akkerman R, Baran I. Liquid droplet impact pressure on (elastic) solids for prediction of rain erosion loads on wind turbine blades [J].Journal of Wind Engineering and Industrial Aerodynamics, 2023, 233:105319.

Nadolski M , Konopka Z , Giewka M , et al. Mechanical properties of investment casting moulds reinforced with ceramic fibre[J]. Archives of Foundry Engineering, 2008, 8(4)：149-152.




DOI: https://doi.org/10.33142/rams.v5i1.11759

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