Feature Oriented Planning And Optimization Of Multi Axis Milling Tool Path For Integral Impeller

The integral impeller that belongs to complex curved surface parts is the core component of turbine engine,which has been widely used in aerospace,energy,power and other fields.The regional space among the blades is small which represents semi closed spiral cavity structure.The surface curvature of impeller is large,the degree of distortion is high,and the blade is thin and relatively long.Therefore,the conditions that the blades are variable and the interference among blades is usual to happen bring great difficulties for integral impeller machining.However,the machining accuracy and surface quality of the impeller surface have a decisive impact on the performance and life of the engine.The efficient tool path planning method has become the focus of the research on the overall machining quality and efficiency.According to the characteristics of the typical surface of the integral impeller,a multi axis milling method of feature oriented integral impeller is proposed and the feature planning system of the whole impeller machining surface is developed.First of all,based on the analysis for the characteristics and difficulties of the whole impeller parts of the processing,multi axis milling feature libraries are established by impeller blades,inlet and outlet channel,and root parts and so on.Matching rules between the impeller machining surface and the tool path characteristic library according to the machining integral impeller surface characteristics.Then,Based on the blade root transition surface of the integral impeller the characteristics are analysised.The cutter shaft control method is researched,based on which,the feasible region of characteristic tool path is given and the relationship between the key process parameters and the feasible domain structure is established for tool path optimization.finally,The framework of the optimized tool path optimization system for the machining of integral impeller and special cutter track milling processing template are constructed.Planning and optimization of the characteristic cutter path for the machining of integral impeller are realized through the matching between the machined surface and the tool path.An example is given to demonstrate the superiority of the feature oriented integral impeller machining method.The research method of this paper simplifies the planning process of the whole cutter path,reduces the number of blades of the impeller machining surface,improves the quality and efficiency of the blade of the integral impeller,and provides an effective reference for solving the problem of the characteristic tool path planning for other types of complex curved surface parts.It is of great theoretical significance and application value to improve the NC milling performance of impeller parts.