Structure Optimization And Analysis Of Grinding Polishing And Measurement Machine Tool For Blisk Finishing

The thrust-weight ratio of the engines can be improved dramatically bycompressor, turbine and fan adopting blisk.The number of parts in blisk is less, andits structure is simple.But the blade shape is complex, blade is thin and distancebetween adjacent two blades is narrow.The blade is easy to deformation when theforce exists. It is difficult to machine inlet edge, the outlet edge and blade root.Atpresent performance requirement of aircraft engine is very high, which requires theblisk have higher precision and surface quality. the manufacturing level of bliskconcern development of aerospace.The processing method of blisk is mainly NC milling,electrolytic machining andlinear friction welding combining with subsequent finishing processing. Finishingprocessing includes mechanical vibration polishing, abrasive flow polishing andmanual polishing. The first two polishing method is efficient, but easy to damage theblade. the surfaces of the blade which is manual polishing are of good quality, butpoor surface consistency and low efficiency.Professionals detect processing qualityof blisk through comparison of blade models and different shapes of blades need toadopt different templates.Sample test is poor universality and low efficiency,so akind of special prototype of polishing processing and testing the integration needs tobe developed.Researching on the degree of freedom which the processing and testing of bliskneed, two kinds of machine tools are presented.Through the comparison of theaspects of structure, control and economy, The final configuration of machine tool isdetermined.The selection of outsourcing standard parts including screw, slide, rotarytable and motor of each axis are completed, and the shape and size of the keystructures such as columns,workbench and bed are designed. The three-dimensionalmodel of machine tool is established by adopting CATIA. The related parameters and the work process of machine tool are confirmed. The static and dynamic analysis forkey components of blisk is conducted. The weak link of columns, workbench and bedof machine tool are analyzed, which are prepare for structural optimization.Thebiggest deformation and stress distribution of the machine are obtained through thestatic analysis of the machine.Through the modal analysis of the machine, themachine various order natural frequency and vibration mode can be drawn.Theselection of tool head motor avoid the low frequency range of the machine as far aspossible.By using ANSYS Workbench, the columns and bed are optimized. The sizes ofcolumns and bed as input, the low order natural frequency and the quality as theoutput, the static deformation, stress as constraint conditions, the optimal solution canbe got through finite element analysis and it is amended according to the castingprocess and sensitivity correction of the design variables.The static and dynamicanalysis are conducted for the optimized machine. On the one hand, the accuracy ofthe structure optimization is verified, and on the other hand, the good design ofcolumns and bed are proved.