The Research Of CAD And CAT's Integrative Technology Of Turbine Blade

Since 21th century, Our country's power generation and aviation industries have achieved a great level of development. Whether to steam turbine, gas turbine, or to space engine and so on, blade can be described as the most critical part of them. Turbine blade play a key role in the energy conversion of power generation, Not only the number of blade is very large, but also because the blade's surfaces'impact of air can directly determine the efficiency of steam turbine's power generation.So,the blade's quality always attract lots of attention. blade's surface splines are very complex, Almost entirely described by the discrete points, And because the blade itself is distorted,Splines are not the same as each other for different z-z section, making surface inspection becomes more difficult.CMM ,as one of the most high efficient precision measuring instruments, was widely used in machinery manufactu ring, automobile industry, electronic industry, aerospace industry and defense industry and other sectors for its superiority, such as high accuracy, easy operation, high flexibility and so on.It has become a all-purpose measuring instrument what is indispensable in the area of Modern industrial inspection and quality control.In this thesis, On the basis of deep research about current inspection methods of blade, integrating auto-distributing measurement path automatic generation system with measuring result analysis system. Blade measurement path planning, including two types--known and unknown CAD models. To the measurement of unknown CAD model, Grey prediction algorithm will be integrated into the DIMS program. Both measurement and prediction work will be completed by the CMM machine itself. To the measurement of known CAD model, firstly, acquire high quality points which meet the auto-distributing requirement by a kind of arithmetic, getting their coordinates and information vectors, Then, Automatically generated DIMS program which will measure the blade along the vectors. Effectively avoid the complex works of the measurement error compensator. After the completion of CMM's measurement, removing the noise data of the measuring data, completing secondary registration, and dispersing the NURBS curves which are reconstructed by measuring points to extract some parameters such as max thickness and max chord.Finally,generating a clear, concise inspection report by analyse all the important parameters.This system is based on UG NX6.0, taking VC++6.0 and GRIP as development tools, making use of UG/OPEN API technology to re-develop to UG.. All functions of this system were verified by the application of blade H368RL,The results is satisfiable.This system can help enterprise overcome the drawbacks of the traditional measuring methods, and also can increase the economic efficiency.