Three-dimensional Modeling Of The Turbine Wheel And Cnc Machining

The power generation with large hydraulic turbine has an extremely important position in the modern energy industry. Blade, runner crown and runner band are the three key components of the turbine. The runner crown and the runner band have the same structure of the simple revolving body. But the structure of the blades is more complex.This article analyses working principle, classification, cavitation phenomenon of the turbine, and also analyses the 3D modeling technology of the extending method of non-uniform rational B-spline curves and surfaces basing on the least square method.Based on years of experience, the author has attached to two aspects of modeling and nc (numerical control) manufacturing. This paper analyzed the geometric design of hydraulic turbine rotor with complicated flow channels, and five major steps of five-axis nc machining.In this work, the core contents are tool-path planning and cutter location calculation of hydraulic turbine with 5-axis simultaneous nc machining. It has analyzed and studied five-axis nc machining comprehensively. The results showed that: according to the side milling of the 3D hydraulic turbine, when planning the tool path, constructing the blade surface is based on the shroud camber line and hub camber line of neutral-covered surface, and the thickness of the blade, then generates the tool path.By using the UGNX of CAD/CAM, this article has analyzed the main components of the turbine with examples. In order to complete the blade processing accurately, it has analyzed and studied the process of the stiffness, the location and the clamping of the blade. The author has completed processing the components of the large hydraulic turbine by applying the advanced automatic NC programmingtechnology.