Study Of Five-axis NC Machining And Simulation Of Integral Impeller

Impeller is a very important component of machinery and equipment industry, which iswidely used in the energy power generation, aerospace, transportation, metallurgy and otherfields.Different processing methods of impeller machining has great influence on theperformance parameters of accuracy and surface quality.As the development of NC machiningtechnology and CNC programming CAM technology. The complex components processedunder five-axis NC machine tools has a significant improvement on the efficiency and a lowtechnological complexity.This paper studies geometry characteristic and processing technology of theimpeller,analyzes machining technological difficulties and technical requirements of theimpeller.Different from the conventional rough and finish machining peocess of theimpeller,the machining of the impeller are classified into four working procedure,which are theslot rough machining aimed to cut a large number of blank material,the leaf bladesemi-machining aimed to cut out the uniform allowance,the leaf blade finishing and passagefinishing.This paper studies the generation of tool-path of five-axis NC machining.In view of theprocessing ofthe impeller’s passage, for easy control ofthe cutter axis,the way of end millingis chosed. An inverted "V" tool-path generation algorithm is prese-nted for the roughing stagewith using equally layered strategy.Cutting tool path of finishing surface is generated by usingparameter line algorithm,in purpose of ensuring the machining accuracy and avoiding toproduce the mark error.Cutter shaft lines of rough and finishi machining are generated by usingthe similar approach on the disk.Then the toolpath is generated.In view of the semi-finish and finish machining of the leaf blade,according to thecharacteristics of the surface,the way of side milling is chosed.By analysing the cutter axis vector’s cotrolling method of ruled tool path,the moving path of side milling of the blade isdetermined,and then the tool path of the semi-finishing and finishing of the blade isprogrammed.According to the planned tool path generating scheme, the modeling of the impeller andCAM tool-path generation are completed based on the platform of CAXA manufacturingengineer.And the tool-path file is converted to an available NC program to a type of heideihainsystem machine tool.This paper establishes the DMU50V virtual machine tool based on theVERICUT.The verification of machining simulation of the NC program is realised with thevirtual machine tool,which proves the tool path and NC program of the impeler is correct,theinverted V-shaped cutter-path method is verified more efficient than the parameter-linetool-path method when they are applied in rough machining the impeller’s passage.This has areference value to the five-axis machining ofother partswhich have comlex curved surfaces.