예열온도조건에 따른 알루미늄 합금 주조재의 응고특성에 관한 연구 = A Study on Solidification Characteristics of Aluminum Alloy Casting Material by Pre-heated Temperature Conditions

다국어 초록 (Multilingual Abstract)

In this study, the solidification characteristics inside the AC7A casting material was analyzed using the numerical analysis method and was verified using the experimental method by the pre-heated temperature conditions of metal casting device. For the numerical analysis, "COMSOL Multiphysics," the commercial code based on the finite element analysis (FEA), was used in order to predict the thermal deformation of the AC7A casting material including temperature, displacement and stress distribution. Also, in order to verify the results calculated by the numerical analysis, the experiment for temperature measurement inside the AC7A casting material was performed using the K-type thermocouple under the same condition of numerical analysis method. In the numerical results, thermal deformation inside AC7A casting material was well-suited for manufacturing products when the pre-heated temperatures of the metal casting device was 250˚C. When the results of the temperature distribution were experimentally measured and were compared with those of the numerical result, it appeared that there was some temperature difference because of the latent heat by phase change heat transfer, However, the result of cooling temperature and patterns were almost similar except for the latent heat interval, The solidification characteristics was closely related to the temperature difference between the surface and inside of the casting.

참고문헌 (Reference)

1 L.D.J. Sully, "The Thermal Interfaces Between Casting and Chill Molds" 84 : 735-, 1976

2 E.M. Winkler, "Stone, Properties, Durability in Man's Environment, Second Edition" springer- Verlag 1975

3 E.M. Winkler, "Stone in Architecture, Properties, Durability, Third Edition" Springer-Verlag 1994

4 Y.B. Kim, "Investigations of Thermal Characteristics of Aluminum Alloy Mold for Precision Casting of Automobile Tire Mold" 1596-1600, 2007

5 "International Alloy Designations and Chemical Composition Limits for Wrought Aluminum and Wrought Aluminum Alloys"

6 Y.K. Oh, "Finite Element Analysis on Thermal Strain of AC7A Tire Mold in Sand Castings" 1830-1835, 2006

7 Van Tol, R., "CFD study of the mould filling of a horizontal thin wall aluminum casting"

8 E.G. Yoh, "Analyses on the High Temperature Fatigue and Brittle Damage of the Casting Mould due to Thermal Stress" 1563-1568, 2003

9 H.P. Wang, "An interactive parametric analysis tool for thin-walled investment casting, In Welding and advanced solidification procsss" TMS 595-602, 1991

10 Howard E. Boyer, "American Society for Metals" 1985

11 "Aluminum Standards and Data"

12 Y.K. Oh, "A Study on Thermal Deformation Characteristics for Improved Manufacturing Process of Aluminum Alloy Mold Products" AFC2007 37-37, 2007

13 Y.K. Oh, "A Numerical Study on Thermal Strain Control of Aluminum Alloy Mold for Tire Manufacturing" 324 : 1087-1090, 2006