Geometric parameter-based optimization of the die profile for the investment casting of aerofoil-shaped turbine blades

Dong, Yiwei; Zhang, Dinghua; Bu, Kun; Dou, Yihua; Wang, Wenhu

doi:10.1007/s00170-011-3681-z

Cited by 36 publications

(10 citation statements)

References 24 publications

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“…3.2.1 Extraction of the camber line C l CLT (t) C l CLT (t) is extracted by the "equidistance line" method, namely the collection of central arced curves can be transformed into the determination of the self-intersection points of the equidistant curves [29]. Given a set of selfintersection points {q 0 ,…,q m }, C l CLT (t) has the same form as Eq.…”

Section: Step Imentioning

confidence: 99%

Reverse modeling strategy of aero-engine blade based on design intent

Zhang

Chen

Tao

2015

Int J Adv Manuf Technol

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Blade geometry plays an extremely important role in the aerodynamic performance of aero-engine. However, in the process of secondary machining for near-net shape or serviced blade, the deviation between the actual and nominal blades can raise serious problems for NC tool path generation. It is even worse that inappropriate reverse modeling may change the design intent and deteriorate the aerodynamic performance. This paper presents an innovative strategy for reconstructing actual profiles from measured data. Comparing with conventional reverse modeling, the proposed strategy emphasizes functional significance of the known feature information concerned with implicit design intent. The preservation of design intent has three levels by cognition of the feature information. Firstly, the established technique for rigid registration is improved by means of incorporating accuracy feature into localization. Secondly, the parametric design methodology of aero-engine blade profile is introduced into the free-form deformation (FFD) of cross sections to control geometry feature, and finally, it guarantees aerodynamic performance feature. Some practical examples are given to demonstrate the effectiveness and superiority of the strategy.

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Section: Step Imentioning

confidence: 99%

Reverse modeling strategy of aero-engine blade based on design intent

Zhang

Chen

Tao

2015

Int J Adv Manuf Technol

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“…1 One of the most important dimensions of hollow turbine blade is wall thickness, which is determined by the wax pattern contour profile, ceramic core contour profile and the relative location of the wax pattern and ceramic core. In recent years, with the progress of pattern mold optimal design technology 2,3 and ceramic core positioning technology, 4 the pattern dimension accuracy and ceramic core localization accuracy were well controlled. Thereby, dimensions of the ceramic core become the main constraint to the accuracy of hollow turbine blade wall thickness.…”

Section: Introductionmentioning

confidence: 99%

B-spline contour curve approximation and deformation analysis of complex ceramic core

Zhang

2018

Proceedings of the Institution of Mechanical Engineers, Part B:

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Complex ceramic core is the critical part for manufacturing hollow turbine blade in the investment casting process. The complex geometry, small inner structures and high-precision requirements of ceramic cores make them difficult to fabricate, and the shape and dimensional accuracy of ceramic cores are very low in factory practice. To understand the deformation characteristics of ceramic cores, a noisy points recognition algorithm, an extraction method of measuring cross-section contour points and a B-spline iterative fitting algorithm using dominant points of chord deviation are proposed. First, the cross-section contour points were provided through registration, slicing and intersection methods. Second, the noisy points were deleted by convex noisy points and concave noisy points recognition algorithms. Third, the cross-section contour curve of the ceramic core was fitted through B-spline iterative fitting method with chord deviation dominant points. The curves fitted with chord deviation points and curves fitted with local maximum curvature points were compared with simulating data and scanning data, respectively, and the results show that B-spline fitting curve needs fewer chord deviation points than local maximum curvature points, 24.4% fewer in simulation validation and 12.5% fewer in experimental validation. In the end, the bending deformation, torsion deformation and shrinkage deformation errors of ceramic core are established by fitting contour curves of serial cross sections of the ceramic core.

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“…Sabau et al found that accurate predictions can be obtained for all measured dimensions when the shell mold was considered as a deformable material [9]. Dong et al established the displacement field of turbine blade which assumed that the wax pattern is injected and fixed with no distortion [10,11]. Although some works for simulating stress and deformation of castings have been reported, most researches are mainly focused on the solidification and cooling deformation behavior of the metal [10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…Dong et al established the displacement field of turbine blade which assumed that the wax pattern is injected and fixed with no distortion [10,11]. Although some works for simulating stress and deformation of castings have been reported, most researches are mainly focused on the solidification and cooling deformation behavior of the metal [10][11][12][13][14]. Bonilla considered that the fundamental physical shrinkage of the die to wax and the casting solidification were the two main reasons for the final casting dimensional changes [5].…”

Section: Introductionmentioning

confidence: 99%

Dimensional shrinkage prediction based on displacement field in investment casting

Wang

Liu

et al. 2015

Int J Adv Manuf Technol

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The preparation of the wax pattern is a key procedure in investment casting, playing an important role with the solidification of the metal on the final dimensional accuracy of the casting part. This study considered the injection procedure and the metal solidification as a whole and tried to discover the individual influence of both factors on the dimensional accuracy of the part. In this paper, a ring-to-ring wax pattern was scanned by a kind of 3D laser scanner after being injected, and its displacement field was used as the input of numerical analysis of the deformation happened in next step. Experimental measurement and numerical prediction were compared then, and the results indicated that predicted shrinkage based on the deformed wax pattern was close to the measured one with only 0.32 % difference on average, and the introduction of the injection procedure improves the numerical prediction by xxx%. The proposed method would benefit for the control of the shrinkage allowances of the casting part.

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Geometric parameter-based optimization of the die profile for the investment casting of aerofoil-shaped turbine blades

Cited by 36 publications

References 24 publications

Reverse modeling strategy of aero-engine blade based on design intent

Reverse modeling strategy of aero-engine blade based on design intent

B-spline contour curve approximation and deformation analysis of complex ceramic core

Dimensional shrinkage prediction based on displacement field in investment casting

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