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Effect of shell mold thickness and insulating wool pattern on internal porosity in investment casting of vortex flow meter

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Abstract

Investment casting (IC) with different insulating wool pattern and shell mold thickness is investigated for a geometrically complex vortex flow meter in this study. The primary coating consists of zircon (ZrSiO4) with colloidal silica (SiO2) binder. Zircon is regarded as a potential engineering material for high-temperature applications for its chemical stability, strong fracture resistance at higher temperature range, and low thermal expansion coefficient. The fundamental properties of the shell mold, such as mechanical property and thermal properties were experimentally validated. The modulus of rupture was found to be 5.6 ± 0.5 MPa. The Heat transfer coefficient (HTC) was calculated to be in the range of 600–900 W/(m2 K). Later as the input data for numerical simulation. In addition, using a computer-aided numerical (CAE) approach and tests, this research investigated whether the thermal properties of varied layer thicknesses and insulating wool patterns may impact the formation of casting defects. The CAE simulation reveals that the initial layer thickness would result in pipe wall problems. To lessen the hot spot region, the first step is to employ different insulating wool patterns, which could reduce the probability of shrinkage forming by 17%. The second step is to increase the thickness of the mold shell to reduce the percentage of hot spots. It is calculated that the optimal design would reduce the probability of shrinkage defects by 47%. The varying thermal properties may significantly decrease the casting faults of a mass-produced vortex flow meter by altering the thickness of the shell mold. In this study, the best solution for vortex flow meter process improvement has been adopted by an IC foundry and mass-produced. The X ray inspection shows flawless results in the vortex flow meter pipe wall where defects often form, and proves the effect and feasibility of the thermal insulation improvement proposal.

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Acknowledgements

The authors gratefully acknowledge the experimental equipment support provided by the Globaltek Fabrication Co., Ltd.

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Authors and Affiliations

  1. Department of Mechanical Engineering, National Central University, Taoyuan City, 32001, Taiwan, Republic of China

    Han-Wei Tseng, Ting-YI Chen, Yi Chen Kao & Yiin-Kuen Fuh

  2. GlobalTek Fabrication Co., Ltd. Xinwu Factory, Taoyuan City, 327001, Taiwan, Republic of China

    Cheng-Fu Huang, Yu-Chen Liu, Sheng-Chan Lee, Chih-Chi Wang & Chien-Wei Chan

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  1. Han-Wei Tseng
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All authors contributed equally to the generation and analysis of experimental data, and the development of the manuscript.

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Correspondence to Yiin-Kuen Fuh.

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Tseng, HW., Chen, TY., Kao, Y.C. et al. Effect of shell mold thickness and insulating wool pattern on internal porosity in investment casting of vortex flow meter. Int J Adv Manuf Technol 127, 2371–2385 (2023). https://doi.org/10.1007/s00170-023-11670-0

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