Finite Element Analysis And Optimization Design Of Modular Machine Tool For In-situ Repairing Hydraulic Turbine

Large hydropower turbines due to maintenance time and site constraints,repairing runner for hydropower unit bottom ring, a ring of large structuralcomponents, etc., the proposed site high intelligence restoration philosophy. It can notonly overcome the unit local repair accuracy is not high; but also can save a lotof manpower and material resources. It is essential design and manufacture ofCNC on-site repair of hydropower unit multifunctional Modular Machine Tool. Largescale hydropower station on-site maintenance Modular Machine Toolcombination structure is very complex. The stiffness and vibration frequency ofmechanical performance machine tool are related to the surface machining precision,machining efficiency and surface roughness, related to the safety and the service lifeof the machine tool. It is necessary to static analysis of the machine tool body structureand the maximum deformation of the machine tool. The maximum stress in the machinetool can be find. The modal analysis of the machine tool can determinethe mode influences the machining accuracy of the machine tool. It can be optimized toimprove performance of the machine tool. So this study has important engineeringsignificance.Research status and development of finite element analysis andstructure optimization of NC machine tool structure at home and abroad werereviewed in this paper thoroughly. Discussed the ANSYS Workbench platform tobuild finite element analysis model of machine tool structure has be done. This paperanalyzes the finite element static analysis and vibration mode of a special combinationof machine tool structure of hydraulic turbine runner bottom ring sealingring field processing. On the basis of the structure of the machine tool is improved, andthe machine tool structure optimized modal analysis of dynamic finite element staticanalysis and vibration. The static and dynamic characteristics of the whole machinetool optimized have improved markedly. The machine structure optimization,deformation of machine tool overall deformation and each direction is improvedobviously. The stress concentration is improved obviously, the static performance hasbeen significantly improved, the structure of the machine tool stiffness distribution isreasonable. Machine natural frequency and modal shape also have certainimprovement. Secondly, for the cantilever system of hydropower unit runnerband scene processing digital control combined machine tool, deformation calculation of the working condition of machine tool and stress, and to designdepartment of machine tool machine tool tip deformation0.15mm as the goal, putforward the improvement measures of machine tool structure, enhancethe cantilever system of the machine tool rigidity, reduce the deformationof structure in by cutting force when the machine tools, improve the machiningquality; the cutting force scheme. Finally, the static and modal finite element analysisof a large hydropower station for Hydro generator of on-site maintenance of CNCspecial combined machine tool has done. The analysis results indicated that themachine tool holder near stiffness needs to be strengthened; machine tool column isinstalled the tool track, so the direction of the finite element deformation is animportant factor affecting the machining precision, should cause takeseriously. Vertical connecting arm and the rest part of machine tool is the weaklink, affect the machining precision, need to improve its natural frequency.