Numerical Simulation Study Of Temperature Field And Stress Field In Short Arc Milling Process

Short Arc Milling is a way of special machining technology.It is a non-contact electrical machining method,which is effective for special properties of alloy materials.New alloy materials and new structures are widely used in the fields of aviation,space and ship,which make higher requirements for the production and machinability of modern industrial equipment,and it is difficult to use conventional machining.For the processing of high performance alloy materials,short arc machining technology has some advantages such as hardness of materials and so on.In recent years,the research on the theory of Short Arc Milling has remained at the basic level because of the complexity of the Short Arc Milling process.The research on the erosion process of Short Arc Milling is more on the experimental level.The computer simulation technology is widely used in the research of discharge machining.The finite element method as the representative of computer numerical simulation software is a more effective tool to study the complex process.The simulation of temperature field and stress field is carried out in the process of short arc milling of the workpiece,and the simulation results are simulated by the actual milling experiment.The correctness of the model is verified and compared.In this paper,ANSYS analysis software is used to simulate the Short Arc Milling Ni based superalloy,and the simulation results of temperature field and stress field are obtained.Through the analysis and study of the processing efficiency(material erosion amount)and the quality of the machined surface,the pulse voltage and feed speed are determined to be the main parameters that affect the milling process.Combined with the short arc actual milling process,it is a nonlinear transient thermal analysis process.The heat source model suitable for short arc milling is selected,the model is set up and the grid is divided,the boundary conditions are set,and a series of simulation processes,such as the loading of the moving heat flux,are realized by APDL language programming,and the temperature field is solved and analyzed.The simulation results show that the maximum temperature of the heat source moving to the middle point of the model increases linearly with the increase of the pulse voltage,and the feed speed increases and the maximum temperature of the heat source moving to the middle point of the model decreases.By setting the melting point temperature of workpiece material,the size change rule of discharge groove width and depth direction can be obtained from the simulation cloud chart.After analyzing the temperature field,the corresponding force field is sequentially solved.The temperature of the obtained unit node is applied to the structural stress analysis as the body load,and the distribution of the residual stress in the numerical simulation of the short arc milling of the nickel base superalloy is obtained.The short arc numerical control machine is used to carry out the milling experiment,and the results of the temperature field simulation obtained by the ANSYS software are compared and analyzed.The results show that the larger the pulse voltage is,the width and depth of the discharge groove are increased to a certain extent,and the width and depth of the discharge groove will decrease with the increase of the feed speed.The erosion rate of the simulated material is similar to that of the experimental material.It proves that the model has a good prediction accuracy and provides a theoretical basis for short arc milling.