SET Proceedings 2978-4387 Caravel Press 10.65582/set.2008.184 2008.184 3D solid modeling method of Francis turbine blade based on UG ZhangLi-da LianLing-jun RenLa-chun MaoJin-duo ChenRong-sheng School of Energy and Environment of Xihua University，Chengdu Sichuan610039，China 24082008 7 1 978-1-995850-08-5 1340 1347 24 August 2008 © 2008 Copyright WSSET 2008

In this paper, 3D solid modeling method of Francis turbine blade is researched. Based on powerful capacity of materializing surface of UG NX 4.0 and the data of original wooden patterns, the blade spline modeling was established by NURBS，and the blade space surface was constructed. Meanwhile making a mathematical analysis for the free surface extension of Francis turbine blades and proposing new solutions. A good result of Smoothness test for runner blades shows that the solid modeling method is feasible. 3D solid model lays possibility for analysis and CNC machining of follow-up blades.

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