Numerical Simulation Of Heat Transfer And Flow Of 2219 Aluminum Alloy Produced Electron Beam Wire Deposition Additive Manufacturing

Electron beam fuse deposition additive manufacturing technology has the advantages of high efficiency,wide application range,and good performance of shaped parts.It has been widely used in aerospace,marine,automotive,medical and other fields.As an emerging forming technology,the e-beam fuse deposition additive manufacturing technology is based on the idea of integration.With the help of modeling software(CAD),the parts to be formed are first dispersed into sheets or layers,and then stacked according to a certain path Shaped.2219 aluminum alloy is often used in welding materials,has good welding performance,and its low density and good low temperature performance,has been well in aerospace and other fields.This paper studies the heat transfer and flow behavior of 2219 aluminum alloy electron beam fuse deposition additive manufacturing process,and comprehensively analyzes the changes in the temperature field and flow field distribution of electron beam fuse deposition.Firstly,according to the actual processing process of e-beam fuse deposition,the physical changes occurred were analyzed.Based on these physical changes,reasonable assumptions were made to simplify the model.On this basis,a physical model of e-beam fuse deposition process was established.According to the established physical model,the main factors influencing the heat transfer flow such as heat conduction,heat convection and heat radiation during the processing are comprehensively analyzed;the energy,mass and momentum control equations in the model are derived;a modified Gaussian rotating body heat source model is proposed In order to meet the characteristics of 2219 aluminum alloy actual deposits with relatively small depth and width;several major boundary conditions of the model were analyzed,the level set method was used to track the moving interface,and the material activation method was used to realize the process of material addition,and finally the electron beam fusion was established.Three-dimensional numerical model of silk deposition.A simulation study on additive manufacturing of electron beam fuse deposition was carried out.The analysis of the heat transfer process showed that the temperature field distribution and changes were basically consistent with the assumption.The study found that the "finishing" phenomenon occurred during the movement of the molten pool.After analyzing this phenomenon,two explanations were proposed: heating explanation and cooling explanation,and then the analysis of the isotherms of 1s-4s during the processing,the results and the heating The explanation is more consistent.Comparing the temperature field distribution and changes of the two groups of molten pools with the movement speed of 10mm/s and 15mm/s,it was found that the group with 10mm/s movement has a wider and deeper molten pool due to the faster movement speed and greater heat input.The flow field of the molten pool is analyzed.The initial flow of the molten pool is relatively stable at the initial deposition.The maximum flow speed of the molten pool is 0.024m/s at 2s.The flow rate of the molten pool gradually increases with the heating time.The maximum flow at 3.6s The speed reaches 0.054m/s.