渦輪葉片鍛造之模具最佳化設計

Mold optimization of forging turbine blade

何維宏(Wei-Hong He)

指導教授 ： 葉維磬

國立中央大學/工學院/機械工程學系/碩士(2006年)

摘要

本文目的在利用MARC有限元素軟體，分析NACA 7415渦輪葉片鍛造加工之模具最佳化問題，以建立最佳模具外形。
首先，利用Wu[25] 實驗擠鍛成形所得之鍛件擠伸高度、凸緣直徑及成形負荷與MARC有限元素解比較，藉以驗證MARC分析鍛造加工問題的可靠性與妥適性。
再者，應用MARC有限元素分析軟體，結合最佳化軟體IMSL，以建立分析葉片鍛造加工問題之最佳化系統，以建立最佳化模具參數。基於不同目標函數及不同摩擦條件下，所獲得的最佳化解亦一併於本文中討論，包含鍛造葉片之誤差及材料應力分佈情形。

關鍵字

渦輪葉片 ； 精密鍛造 ； 最佳化

並列摘要

This article uses the finite element software MARC to analysis the optimization of NACA7415 turbine blade in forging process. In order to establish the best mold shape.
First, this article proves the trusty of the experiment[15] and the finite element results in axial-symmetry close-die forging process by using MARC analysis.
As well , we union the finite element software MARC and optimal math library IMSL to establish an optimal system of MARC to analyze the problem of blade in forging process. By setting different factors of goal function and friction, we will discuss the optimal results, include error of forging blade and stress distribution of material.

並列關鍵字

optimization ； turbune blade ； precision forging

參考文獻

[ 1] L. B. Aksenov, N. R. Chitkara, W. Johnson, “Pressure and deformation in the plane strain pressing of circular section bar to form turbine blades,” Int. J. Mech. Sci. 17 (1975) 681-688.

[ 3] W. Johnson, Proc. Third U.S. Natn. Cong. Appl. Mech., Brown University, Providence, p.571, 1958.

[ 4] B.S. Kang, N. Kim, S. Kobayashi, “Computer-aided perform design in forging of an airfoil section blade,” Int. J. Mach. Tools Manuf. 30 (1990) 43-52.

[ 5] G. Maccarini, C. Giardini, G. Pellegrini, and A. Bugini, “The influence of die geometry on cold extrusion forging operations: FEM and experimental results,” J. Mater. Process. Technol. 27 (1991) 227-238.

[ 6] Z. Wang, K. Xue, Y. Liu, “Backward UBET simulation of a blade,” J. Mater. Process. Technol. 65 (1997) 18-21.