The Measurement Of Aero Engine Blisk

Aero engine blisk is a kind of high precision workpiece and the processingquality directly effects on the engine performance. The traditional distributedprocessing method must be abandoned because of the development of measurementand aerospace technology. Entire processing becomes main method. So it issignificant to evaluate the processing accuracy. The parts which do not meet theprocessing requirements and machining problems can be found timely and solvedcompared with ending measuring. It is helpful to improve the production efficiencyand resource utilization. The following work is proposed in this paper according tothe project demands.1. A novel on-machine measuring euipment is designed for the first time inchina according to features of blisk and processing environment to finish the work ofevaluating processing accuracy on blisk.2. An algorithm is proposed based on initial rod’s posture for inversekinematics. The problem of invers kinematics about the designed measuring machinewith five freedoms has been solved. Experiments show that the proposed algorithmcorrectly realizes measuring target points and completes automaticaly test work.3. The whole and the single-step calibration methods are both elaborated inthis paper. Error correcting model is established to realize error compensation. Theproposed algorithm of whole calibration shortens the searching time of GAalgorithm and solves the problem of least squares method’s pathological matrix. Sothe convergence rate has been improved greatly.4. Common ways and basic principles of path planning are discussed in thispaper. The calculation method of obstacle avoidance points is presented. Scanningmode and direction are both determined according to system structure. The work ofpath planning about single-point and scanning measurement is completed lastly.