Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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Transactions of Nonferrous Metals Society of China

Vol. 21    No. 2    February 2011

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Determination of wax pattern die profile for
investment casting of turbine blades
DONG Yi-wei, BU Kun, DOU Yang-qing, ZHANG Ding-hua

Key Laboratory of Contemporary Design and Integrated Manufacturing Technology, Ministry of Education,
Northwestern Polytechnical University, Xi’an 710072, China

Abstract:In order to conform to dimensional tolerances, an efficient numerical method, displacement iterative compensation method,g axis of the puch  based on finite element methodology (FEM) was presented for the wax pattern die profile design of turbine blades. Casting shrinkages at different positions of the blade which was considered nonlinear thermo-mechanical casting deformations were calculated. Based on the displacement iterative compensation method proposed, the optimized wax pattern die profile can be established. For a A356 alloy blade, substantial reduction in dimensional and shape tolerances was achieved with the developed die shape optimization system. Numerical simulation result obtained by the proposed method shows a good agreement with the result measured experimentally. After four times iterations, compared with the CAD model of turbine blade, the total form error decreases to 0.001 978 mm from the previous 0.515 815 mm.


Key words: turbine blade; numerical simulation; displacement field; wax pattern die profile; investment casting

ISSN 1004-0609
CN 43-1238/TG

ISSN 1003-6326
CN 43-1239/TG

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