Research On The Selective Laser Melting Process Of Waveguide Slot Array Antenna

Waveguide slot array antennas are widely used in structures with complex features such as high accuracy,micro size,overhanging structure,and special-shaped cavities.Therefore,the manufacturing process level of waveguide slot array antenna structures directly determines the actual electromagnetic performance of the antenna to a large extent.The rapid development of laser selective melting(SLM)is being widely used in aerospace,medical,precision electronics and other fields,which provides new ideas for the manufacturing process of waveguide slot array antennas.Aiming at the technical problems of various overhanging features of waveguide slot array antennas in SLM forming,this paper uses numerical simulation combined with experiments to study the temperature field stress field simulation of overhanging features SLM forming,and seeks to improve process parameters to improve Antenna forming accuracy.The following is the research content and innovative work of this article:(1)Study the numerical simulation of SLM multilayer temperature field on the overhang features existing in the antenna,and research on the basic characteristics of the temperature field of the overhang feature SLM forming,and study the influence of laser power,scanning speed,scanning interval,and tilt angle on the thermal behavior and size of the molten pool.The study found that the temperature characteristics of the overhang area are significantly different from those of the non-overhang area.The size of the molten pool,the node temperature,and the temperature gradient in the overhang area are significantly higher,and the size of the overhang area and the liquid time are more significantly affected by the process parameters.(2)Study the numerical simulation of the SLM multilayer stress field on the overhang features in the antenna,and study the evolution law and distribution characteristics of the overhang feature SLM forming stress field,and study the laser power,scanning speed,tilt angle to the overhang structure stress field and warp Influence of the amount of bending deformation.The study found that during the formation of the multilayer stress field,stress cycles exist in the overhanging and non-overhanging areas,and the inclination angle has a large effect on the residual stress.Finally,the influence of process parameters on the amount of warpage deformation was predicted using Bp neural network.(3)The experimental results were used to verify the simulation results.It is found that when the laser power is larger,the scanning speed is smaller,and the tilt angle is smaller,the width of the molten pool is larger,and the shape is more uneven;The strategy of variable spot compensation is used to optimize the accuracy of the forming size of the suspension at different angles.Furthermore,a 3D scanner combined with Geomagics wrap 2017 software was used to analyze the warpage and deformation of the 3D deviation.Finally,the local characteristics of the waveguide slot array antenna were formed.It was found that the laser selective melting and forming of the waveguide slot array antenna performed well.