The Study Of Parallel Polishing Machine System On The Turbine Blade

This paper researches and develops an automatic polishing method to polish the turbine blade by the use of the Parallel Kinematics Machine Tool.Firstly, the turbine blade is frequently polished manually, this way is repetitive, time-consuming and requires experience. Furthermore, the usual polishing equipment is relatively out-of-date, working conditions are poor and harmful to workers' health. Meanwhile, the polishing efficiency is low and the polishing effect is varied with the different proficiency of workers. This paper also introduces the foreign advanced polishing process which uses robots to polish. According to the current situation, this paper presents this kind of automatic polishing method.Secondly, this paper summaries the study and application of PKM both at home and abroad, and analyzes characteristic of some typical PKM in detail. Finally this paper adopts 6-SPS PMT to polish the turbine blade. Constitutes and characteristics of the 6-SPS PKM are introduced, the number of its degree freedom is calculated, and the inverse solution of the position is analyzed. The first and second order kinematic influence coefficients of the PMT are deduced, and the forward and inverse equation of the velocity and acceleration are deduced. The duality between kinematic Jacobian and dynamics is analyzed.Then, based on the analysis of 6-SPS parallel mechanism, and comparing with several modeling methods, finally this paper selected UG software to establish the solid modeling of the parallel mechanism and the turbine blade. After the analysis of the polishing process of the turbine blade, the simulation machining of the turbine blade is realized in UG CAM environment and the cutter location source file (CLSF) is created. According to the post processing of the CLSF, The values of the rod length of the parallel mechanism can be figured out. The simulation machining of the turbine blade is realized in 6-SPS parallel mechanism by spreadsheet driving function in UG. Through simulation machining, it is proved that the tool position is correct and any interference among the rods can be detected. This research provides the theoretical basis to polish the turbine blade by use of the Parallel Kinematics Machine Tool.Finally, some suggestion and expectation for improving the post processing of the CLSF and the polishing simulation machining of the blade are put up forward.