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Modeling and Simulation of Heat Transfer Phenomenon Related to Mold Heating during Investment Casting

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Document pages: 24 pages

Abstract: The shape of the casting in investment casting determines the performance and service life of the casting. These characteristics are a function of casting part parameters (static and dynamic), part geometry and die geometry, properties and types of cast metal, characteristics (external and internal) and processing parameters (heating rate, cooling rate, pouring rate). Improper and insufficient operation and modification of die performance will reduce the performance and service life of castings. Using the standard transport equation, all heat transfer coefficients (HTCs) are determined as the effect of external casting mold heating on the final casting performance, and simulated in C + + to verify its mathematical model of the experimental results. Pure Ion is casted in investment molds of silica sand with zircon coating. Airflow near the mold surfaces was partially restricted due to geometry of the molds and arrangement of the pieces around a tree. The variations in heat transfer coefficient contribute towards total heat transfer out of mold surface. External heating is found to be very effective for improved casting properties. The mold heat transfer profile is found to be in good agreement with experimental values validating the effectiveness of mold heating.

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