Three-Dimensional Surface Heat Transfer Coefficient and Thermal Stress Analysis for Ceramics Tube Dipping into Molten Metal

Yasushi Takase; Wen Bin Li; Hendra Hendra; Hiroki Ogura; Yusuke Higashi; Naoaki Noda

doi:10.4028/www.scientific.net/KEM.452-453.233

Paper Titles

A Method for Earthquake Damage Prediction of Building Group Considering Building Vulnerability Classification
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The Failure Mechanism Analysis on a Reinforced Concrete Frame Structure in Beichuan County - The Heavy Disaster Areas of Wenchuan 8.0 Earthquake
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Evaluation of Failure Behavior and Strength of Fractured Rock Sample Using In Situ Triaxial Compression Tests and Expanded Distinct Element Method
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Study on Fracture Behaviors of Injection-Molded Bamboo Fiber/PBS Composites
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Three-Dimensional Surface Heat Transfer Coefficient and Thermal Stress Analysis for Ceramics Tube Dipping into Molten Metal
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Effective Young’s Modulus of Spiral Accumulating Core Used for Permanent Magnet Motor
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Thermal Stress Analysis for Shrink Fitting System Used for Ceramics Conveying Rollers in the Process of Separation
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Single and Double Edge Interface Cracks in a Bonded Plate under Arbitrary Material Combination
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Stress Intensity Factors of a Crack on the Interface of Adhesive and Adherents
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Three-Dimensional Surface Heat Transfer Coefficient and Thermal Stress Analysis for Ceramics Tube Dipping into Molten Metal

Abstract:

The low pressure die casting machine has been used in industries because of its low-cost and high efficiency precision forming technique. In the low pressure die casting process is that the permanent die and filling systems are placed over the furnace containing the molten alloy. The filling of the cavity is obtained by forcing the molten metal, by means of a pressurized gas, to rise into a ceramic tube, which connects the die to the furnace. The ceramics tube, called stalk, has high temperature resistance and high corrosion resistance. However, attention should be paid to the thermal stress when the ceramics tube is dipped into the molten metal. It is important to reduce the risk of fracture that may happen due to the thermal stresses. To calculate the thermal stress, it is necessary to know the surface heat transfer coefficient when the ceramics tube dips into the molten metal. In this paper, therefore, the three-dimensional thermo-fluid analysis is performed to calculate surface heat transfer coefficient correctly. The finite element method is applied to calculate the thermal stresses when the tube is dipped into the crucible with varying dipping speeds and dipping directions. It is found that the thermal stress can be reduced by dipping slowly when the tube is dipped into the molten metal.