Axis CNC Machining Study Post-processing Technology And High-speed Cutting Simulation Technology

Five-axis linkage CNC machining technology and high speed cutting technology which are two trends of the advanced manufacturing field are developed to solve the difficulties in high efficiency and high precision of manufacturing complex parts. In this thesis, according to the national special project:high-speed technology and multi-axis linkage machining technology for aerospace typical parts, post processing technology for five-axis linkage CNC machine tools and high speed cutting technology for Ti6A14V were researched. The generality problem of post processing and the selection criteria of cutting parameters were mainly discussed in this thesis. The main research contents are as follows:Post processing algorithm was researched, and cutter location source data file and NC code format were analyzed. Based on UG/Post Builder, the revolution axis post processor for5DGBC50five-axis machining center was developed. After analyzing the difference of orientation vector post processor and revolution axis post processor, with the development language of TCL, the orientation vector post processor was developed on the basis of revolution axis post processor. By using integral impeller, a typical complex part, as manufacturing object, the simulation to practical machining was done in VERICUT software. The simulation results validate the post processor.The portability of orientation vector NC program is proposed. By analyzing the principle of orientation vector post processing and simulating different machine tools, the portability of orientation vector NC program is testified. It provides a new way to build general post processor.Taking the physical separation rule of fracture energy damage evolution as chip separation criterion, Johnson-Cook model as the material constitutive model, the serrated chip of cutting Ti6A14V in high speed was simulated through ABAQUS. Compared with the experimental data, the reliability of simulation model was validated. The important physical variables in the process of high speed cutting were researched. The effects of the cutting parameters on cutting force and temperature distribution on the front face of tool were analyzed. The results show:in the range of180m/min-480m/min, with the increase of cutting speed, cutting force decreases, and the maximum temperature on the front face of tool raises; in the range of0.1mm-0.4mm, with the increase of cutting depth, both cutting force and the maximum temperature on the front face of tool raise. Based on the analysis and research, some corresponding improvement plans for optimizing cutting parameters and increasing tool life were put forward.The research enriches the thoughts of developing post processor for five-axis linkage CNC machine tools and the method of analyzing the high speed cutting parameters for Ti6A14V, which is of great practical significance to promoting the use of five-axis linkage CNC machine tools and Ti6A14V titanium alloy.