Dimensional Stability Investigation on a Gas Turbine Blade in Investment Casting

Y. Miladi¹ , M.R. Alizadeh² , A. Khedmati³

Section:Research Paper, Product Type: Journal-Paper
Vol.11 , Issue.3 , pp.40-45, Sep-2024

Online published on Sep 30, 2024

Copyright © Y. Miladi, M.R. Alizadeh, A. Khedmati . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
In General, casting process with high dimensional accuracy has been always very challenging. In effect, in these casting processes, dimensional deviations usually are initiated from wax injection into a die. In this research, the blade that was studied had a shroud and its airfoil’s length was very long, thus, the most deviation in the dimension of the blade was observed in the shroud of the blade. In other words, the dimension of the blade was studied in its shroud specifically. Therefore, casting the blade with an appropriate degree of accuracy and stability was very difficult and significant. In this study, one proposed solution that suggested preventing the deviation was controlling the dimension of the shroud to assure its geometry assurance. The proposed solution was to attach a wax rod from the platform area to shroud to prevent further deflection of the blade tip. Then, to evaluate the deviation amount, dimension was measured by coordinate measuring machine (CMM) tool and also by geometry optical measuring (GOM) method. The results show that using wax rods improved the dimensional deviations. In fact, the statistical measurements show that the amount of deviation in the critical points of the blades with rod is more compatible with the base model compared to the blades without rod.

Key-Words / Index Term :
Dimensional Stability; Dimensional Deviation; Investment Casing, Investment casting, Wax, Shroud

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