Research On NC Machining Process Optimization For The Axial Flow Whole Impeller

Axial flow whole impeller is a core component of the turbine engine and iswidely used in the aerospace field. Because of the complex surface characteristicsand the blade thin-wall structure of the whole impeller, using machining technologyefficiently and fast dues to get a good processing quality has been the focus ofresearch in the machining field. The processing of whole impeller with titanium alloyis difficulty of its high strength, processing and stability require high processingproblem also be studied.In this paper, firstly, Axial flow whole impeller model was established throughthe NURBS reverse algorithm method and built with UG software.Secondly, Process analysis of the characteristics of whole impeller has beenmade to find the processing difficulties. The cutting-tool selection method was raised.And the whole impeller jig has been designed.Thirdly, according to process analysis of the difficult technology points be findout, the processing planning design and processing method ware put forward. Thecharacteristic of the plunge milling used in rough machining is a vertical andhorizontal cutting movement. put in milling process "a horizontal a longitudinal"According to the processing characteristic and the present situation of the generalsoftware, the method of minimum area of operations in multi-axis machining millingprocess area division and inserting milling cutter axis set ware put forward.The calculations of cutting step length and path interval and the method of tool-axis controlling have been done to make an optimization for finish processing. Theoptimization is due to reduce the influence of processing errors and to avoid theinterference collisions caused by cutting tools and blade.Then, in order to improve the processing stability of titanium, the thin-walledwith titanium alloy TC4the commonly used grade in the aerospace field has been used in a processing stability test. The process parameters of spindle speed, feed rate,cut depth, cut wide on titanium alloy thin-walled have been tested to make a cuttingforce optimization.Finally, the coordinate system of the multi-axis machining center has beenanalysed. Machining center model has been established as the actual processingenvironment based on VERICUT simulation software to do a confirmation fordesigned process optimization. After machining simulation, the actual processing ofthe whole impeller was finished.