Automotive Turbocharged Impeller Machining Simulation And Research

Impeller is an important and typical machine part in mechanical assembly industry. Its structure is complex, and it has obvious characteristics of shape. The knowledge of aerodynamics and hydrodynamics are needed in impeller modeling. The manufacturing method, process planning, cutting precision and quality of impeller play an important role in its performance. Impeller is widely used in industry, such as energy, aerospace, shipbuilding, metallurgy, ect. With the increasing development of impeller machining technology, 5-axis linkage CNC technology is more and more applied in impeller machining, and the technology is gradually mature. To improve the efficiency and quality of the technology of manufacturing impeller on 5-axis linkage CNC machining technology, some researches which are connected with practical producing ability and requirements from manufacturers are carried out.This paper studies the NURBS principles and structure of the impeller is analyzed firstly, and then processed shard intercept point cloud into a UG/CAM software using reverse engineering technology of blade model reconstruction and the model of the integral impeller. Secondly, the manufacturing techniques of impeller based on high-speed milling and 5-axis linkage CNC technology are studied to make the reasonable process. The reasonable process plan of impeller is given after analysis of the key problems and technique requirements such as choosing of blank, tool and workpiece, shaft control method and cutting allowance, ect. Then an mathematical model is established by mathematical optimization method in order to minimize the machining time and improve quality. The calculation of the model is performed to get the optimal parameters with the MATLAB software. In the guide of the optimized scheme, machining program is writed in the platform of UG/CAM, and then a cutter-location-source-file(CLSF) is obtained. In the platform of UG/Post, the structure of the DMU 80-monoblock are analyzed to make the Post Builder for it, and transform CLSF to NC codes by using the Post Bulider. Finally the model of DMU 80-monoblock is established and simulated in VERICUT in order to test the rightness of NC codes and economic performance of machining.