Study On Cutting Technology And Cutting Tool Of Turbine Rotor With Tree-type Wheel Groove

With the power energy becoming an important pillar of industry,many countries in the world have developed power industry one after another.Steam turbine generators have the characteristics of large power generation and stable operation,which is of great significance to the development of electric power in China.The fir-tree type wheel groove belongs to the end of the low pressure stage of the turbine rotor which is difficult to process.It runs in bad condition such as alternating load and thermal stress.The quality of grooves determines the life and performance of the steam turbine.Therefore,the research has become a hot spot.Because the traditional technology can not satisfy the arc wheel groove,and the new material used in the rotor material has poor processing performance.The heat accumulation in the wheel groove is high and the machining difficulty is great.Therefore,it is the key to ensure the machining quality of the grooves to select the new cutting process and ensure the machining precision of the tool.In this paper,two kinds of abietic tree type wheel groove milling technology and milling cutter coating scheme are put forward.By studying and analyzing the structure and material of wheel groove,the working procedure is assigned.According to the comparison of several important indexes,the reasonable process scheme is selected.The material constitutive model and thermal-mechanical coupling model of new rotor steel milling are studied.Through numerical simulation,the milling model and setting of important parameters under two coating schemes are established.Based on the results of numerical simulation,the suitable coating scheme is selected.The wear and durability of the milling cutter is described.The optimum group is obtained by the orthogonal test and the reasonable analysis method.To take the milling cutter wear as the optimization objective,milling parameters and friction coefficient as the horizontal factors.Through equivalent transformation,the influence of tool geometry angle on machining in two-dimensional model is studied.Finally,the coating of milling cutter is prepared according to the enterprise test,and the milling test of fir-shaped wheel groove is carried out by using Ingersoll integral machine tool.The tool wear morphology is observed by numerical simulation and the comparison of the experimental results.The reliability of cutting simulation results is judged.