Path Planning And Experimental Study On Efficient Trochoidal Rough Machining Of Blisk

The blisk is one of the key parts of aero-engines,and five-axis CNC(Computerized Numerical Control)milling is the main machining method.The blisk has a complex structure and is usually made of difficult-to-machine materials such as high-temperature alloys and titanium alloys.In CNC machining,tool paths are difficult to generate and tool wear is very serious.High tool cost and low efficiency are common problems in the machining of blisks.So,improving machining efficiency and tool life has become the main direction of the research on the blisk CNC machining technology.From the forging blank to the finished product,the material removal of the blisk is more than 80%.In the rough machining,the material removal of the runner is the most.Therefore,it is necessary to study the machining strategies of the blisk runner and parameter optimization methods to improve the machining efficiency.This paper focuses on the research of efficient path generation and machining parameter optimization methods for the CNC machining of the blisk runner.Based on the UG platform,the corresponding software module was developed and verified by the machining experiment.The main research contents include:1.A method for planning the trochoidal path for rough machining of the blisk runner was proposed,which specifically includes the establishment of a trochoidal model in the UV parameter domain,and determines the step length and row spacing of the tool location based on the equal chord height method and the parameter method.the feasible region of the tool axis changing along the parameter direction is obtains by the Boolean operation,and the limit vector is interpolated to transition to a non-interference and smooth tool axis vector through the quaternion.2.A five-axis milling force prediction model for ball-end tool trochoidal machining was established,determined the cutting area and instantaneous cutting thickness based on Boolean operation and boundary projection,analyzed the results of multiple calibration experiments by ordinary least squares,and calculated milling force coefficient.The milling force of trochoidal milling was simulated by the model,and the feed speed was optimized by constraining the peak force of each trochoid.3.Based on the secondary development of UG,by calling various application modules and API functions,the generation of the trochoidal path,the modeling of milling force,and the optimization algorithm were realized,and the corresponding software modules were developed.4.The feasibility of trochoidal milling path and feed optimization was verified through the numerical control machining experiment of the blisk runner and compared the efficiency and tool wear of flank milling and layer milling,which explained the trochoidal milling strategy is suitable for blisk runner processing.