空心涡轮叶片复杂陶芯弯扭变形分析方法比较

陶芯作为熔模铸造空心涡轮叶片的内腔转接件,其弯扭变形程度直接关系到空心涡轮叶片的壁厚尺寸精度。为了研究陶芯制造过程中出现的弯曲和扭曲变形,首先,借鉴叶片给出了陶芯弯曲变形和扭曲变形的定义,并根据陶芯结构特点研究了陶芯弯扭变形的计算方法,包括基于轮廓线的弯扭变形计算方法:主动轮廓模型法和样条拟合轮廓线法,与基于数据点的弯扭变形计算方法:凸包算法、二维配准算法和距离权值算法。然后,分别通过仿真与实测数据比较了5种算法,结果表明:样条拟合轮廓线法具有更高的稳定性和精度。

Comparison of Bending and Torsion Deformation Algorithms for Ceramic Core of Hollow Turbine Blade

Ceramic core is used to form the cooling channel of hollow turbine blade in investment casting process. The bending and torsion deformations of ceramic core have direct inlfuence on the wall thickness dimension accuracy of turbine blade. To study bending and torsion deformation of ceramic core generating in manufacturing process, ifrstly, based on the deifnition of bending and torsion deformations for airfoil and the structure characteristics of ceramic core, the al-gorithms for computing bending and torsion deformations of ceramic core are studied, including contour-based methods:Snake-model, spline-iftting method and point-based methods: Convex-hull, 2D-registration, distance-weight method. Sec-ondly, through computing a simulated known bending and twist deformation, these ifve methods are compared. The com-paring results indicate that the accuracy and stability of spline-iftting method is better than other methods.