Analytical and Experimental Study of Investment Casting with Laser Stereolithography
نویسنده
چکیده
ANALYTICAL AND EXPERIMENTAL STUDY OF INVESTMENT CASTING WITH LASER STEREOLITHOGRAPHY MODELS by Wen-Long Yao This dissertation presents an analytical and experimental investigation of ceramic shell cracking during the burnout process in investment casting with internally webbed laser stereolithography (SLA) patterns. Included in the consideration are the cracking temperature of the ceramic shell, the web link buckling temperature, and the glass transition temperature of the epoxy resin. The hypothesis is that shell cracking will occur when the cracking temperature is lower than the glass transition temperature and the web buckling temperature. An analytical and experimental study has been conducted, with the cross-sectional area, the span length of the web structure, and the shell thickness being the variables. It is found that the ceramic shell cracking and the internal web structure buckling are related to the cross-sectional area, the span length of the web structure, and the shell thickness. A finite element analysis (FEA) model is developed to simulate the burnout process in investment casting with an SLA webbed pattern. The numerical results show that the shell cracking in investment casting can be prevented by the buckling of epoxy webbed pattern in early stages of the burnout process. A strain gauge based experimental study validates the trend of the computational prediction from FEA of the burnout process in investment casting with SLA webbed epoxy patterns. The thermal insulation property of ANALYTICAL AND EXPERIMENTAL STUDY OF INVESTMENT CASTING WITH LASER STEREOLITHOGRAPHY MODELS
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[1] S. Jones, M. Jolly, and K. Lewis, "Development of techniques for predicting ceramic shell properties for investment casting," British ceramic transactions, vol. 101, no. 3, pp. 106-113, 2002. [2] S. Pattnaik and M. K. Sutar, "Effect of saw dust content on slurry rheology and mechanical properties of the investment casting ceramic shell," International Journal of Metalcasting,...
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