Research On Green Cutting Simulation Of Turbine Engine Hot End Parts

Turbine engine is widely used in aerospace,ship,power generation and other heavy industry projects,and has become an important index to measure the national industrial level.The hot-end component is the core component of the turbine engine operation,and its operating environment is very severe.GH536 is a nickel-based high-temperature alloy,which is often used to make hot-end parts of turbine engines.However,nickel-based alloys are difficult to machine metals,which limits the application of GH536.Therefore,the milling force and temperature of GH536 are studied.Is of great significance.In order to reduce the waste of manpower and material resources,the method of combining cutting test with cutting simulation is the main way to analyze the cutting performance of materials at present.Based on the basic theory of metal cutting and finite element technology and the research platform of cutting simulation software Deform as the research platform,this paper models the milling simulation process of GH536 superalloy,including the modeling and import of simulation geometry models,and the division of meshes.And refinement,material parameter model and constitutive model of workpiece,friction model and heat transfer model of cutting simulation,and selection of separation criterion.In order to obtain the critical failure value of separation criterion of GH536superalloy,the uniaxial tensile experiment of thin plate was designed and the process was simulated by using DEFORM.The Normalized Cockcroft&Lathan critical failure value of GH536 was obtained by combining experiment and simulation,so as to complete the establishment of the cutting simulation model.A set of milling force measurement experiments is designed.The experimental results are compared with the simulation results of the established cutting simulation model to verify and modify the cutting simulation model.Then design a set of orthogonal simulation experiments,based on the simulation results to analyze the effect of milling amount on milling force,the results show that:f_x has a negative correlation with milling speed,a positive correlation with milling depth,per tooth metering and milling width;f_y has a negative correlation with milling speed,a positive correlation with milling depth,per tooth metering and milling width;f_z has a positive correlation with milling speed,milling depth,per tooth metering and milling width.The empirical model of milling force GH536 is established by means of multiple linear regression equation,and the empirical model is verified by experiments,the results show that the empirical model can satisfy the prediction and analysis of milling force.A group of single factor simulation experiments are designed to simulate the milling temperature by using the model modified by the milling force simulation.The influence law of the milling amount on the milling temperature is studied,and the milling temperature field is analyzed.The results show that the milling temperature is positively related to the milling speed,milling depth,feed per tooth and milling width,and the order of the influence degree is milling speed and milling width Degree,feed per tooth,milling depth;analysis of temperature field of milling cutter indicates that the temperature center of milling cutter is located at the front face of the blade;analysis of temperature field of milling workpiece indicates that the temperature center is located at the upper position of chip separation at the beginning of cutting,and the temperature center is transferred to the connection of chip and upper surface of workpiece as the milling proceeds;the temperature of P1,P2 and P3 on the machined surface,chip and tool tip in the milling process are studied.The results show that the temperature of the three points increases first and then decreases.The temperature of P1 is the highest when the milling cutter passes through P1,and then the temperature of P1 drops sharply when the chip takes most of the heat away.The temperature of P2 reaches one after a period of time due to the friction between the milling cutter and chip After that,because of the transfer of cutting heat,the temperature of P2 point rises slowly,and P3 point reaches the highest when the heat production and heat dissipation balance.