Research On The Process Optimization Strategy And Experimental Of Improve Precision Of The Impeller Based On Non-uniform Allowance

Complex curved surface integral impeller is the core component in the high-end industrial equipment. It have complex structures, surface distortion is serious, high material removal rate, poor stiffness. Its surfaces shape and manufacture precision decide equipment's work efficiency. It is one of the important and difficult for the research direction of the computer-aided manufacturing currently as interference; cutting chatter and deformation are easy to occur in the manufacturing process for integral impeller. Its manufacture is extremely difficult.The manufacturing difficulty of integral impeller was introduced, the development of manufacturing technology, the latest technology in the world and the development trend of the future were reviewed. The main factors of effecting processing and manufacturing precision of weak rigidity parts were expounded. The mechanism of integral impeller machining distortions was analyzed. The non-uniform allowance process optimization strategy was proposed in the paper. Non-uniform allowance process of axial flow impeller of environmental control system was optimized. The deformation, mode of vibration and harmonic response of the impeller based on NX advanced simulation module and ANSYS Workbench were analyzed. The test result shows that the optimization rate of leaf blade stiffness in directions is 58.82%, 50% and 37.5%, respectively. The whole flow manufacture process of impeller was designed. Tool path for five-axis machining and machine tool simulation based on NX CAM were planned. The comparisons of cutting processing before and after optimization and the surface profile detection of the test part with the 3D scanning were made. The test result shows that suction surface is optimized of the blade which average optimal rate of the manufacturing precision is 63.8%, pressure surface is 48.84%. The result proves the validity and practicability of the process optimization strategy. The process optimization strategy can used to improve process performance and product quality to the similar structure of impeller.