Analysis, Optimization And Testing Of Structure Of Mill Machine For High-speed Dry Cutting Of Spiral Bevel Gear

With the development of the spiral bevel gear cutting machines from low speedwet cutting to dry cutting without cooling fluid, there are more high requirements onthe performance of the machine tools, including accuracy, rigidity and efficiency.Based on the machine dynamics theory, this thesis analyzes the static and dynamicproperties of the machine tool structure through the FEA and experiment. Thestructure of the machine tool is optimized.Based on the theory of the machine dynamics, the design and optimizationprinciples of machine tool are summarized, combining the optimizing method andthe engineering. The basic processes of machine tool structural dynamics analysis onthe high-speed dry cutting spiral bevel gear cutting machine are designed.The key components of the spiral bevel gear milling machine are simulatedaccording to the blueprint by ANSYS. The sensitivity of the performance of theparts(including the spindle box holder and the bed body), including the weight andnatural frequency, to the design parameters (the plate thickness etc.) is calculated.The impact of the changes in the structure and size on the function of the machinestructure is researched. The improving schemes of the machine components arepresented, according to the comprehensive performance index. On the basis of it,through bonding method which is used for simplifying the contact face, the finiteelement simulating on the complete machine are elaborated. The modal test on themachine is completed. The simulation model is amended by changing the area of thejoints surface in accordance with the experimental result. The comprehensive test onthe static stiffness of the machine is completed. The stiffness of some parts arecalculated applying principle of the series connection of the mechanical springs. Therecommendations for improvements in the assembly are set forth.Cutting trials of the bigger one of the gear pair are implemented. The vibrationacceleration signals under different processing methods and cutting parameters arecollected. The conclusion of the simulation and testing and the cutting performanceare tested. The reference basis for choosing the cutting parameter is provided.In this paper, the dynamic model of the milling machine is established, makingit richer of the design knowledge and information of the spiral bevel gear high-speed dry cutting machine. The reliable methods and data for the development andapplication of spiral bevel gear cutting equipment are provided.