Lightweight Structure Design And Support Addition Based On Selective Laser Melting Technology

With the advancement of science and technology,the additive manufacturing technology has been developed rapidly and has received wide attention at home and abroad.Selective Laser Melting(SLM)technology is a laser sintered metal-based additive manufacturing technology,the outstanding advantages of which are the ability to form complex part structures,high material utilization,and rapid response to changes in product structure design.In this paper,combining SLM and structural lightweight design,a systematic analysis of the design constraints and design rules for part lightweighting based on SLM techniques is presented.According to the SLM technology forming process,the problem of support structure addition is studied,the factors to be considered for support addition are sorted out,the existing support addition methods and support addition problems are summarized and the high quality forming of lightweight structure is realized.The main research in this paper is as follows.(1)Introduce the significance of the project through a background introduction that introduces the working principles of SLM technology and the current state of research at home and abroad.For the lightweight design based on SLM,the demand for lightweight design of SLM and the research status at home and abroad are analyzed;To deal with the defects of SLM molding of lightweight structure,the method of supporting addition was proposed and the domestic research status was analyzed.(2)Research the lightweight design of parts based on SLM.Starting from the working principle of SLM technology,the constraints of lightweight design of parts are studied,and structural lightweight design rules and methods are proposed for the design constraints.(3)Mainly studied the problem of adding support structure based on SLM.The role of support addition and design guidelines are introduced,and the support addition method is proposed.For manually adding support methods,the structure types of support are listed based on Magics software,and the characteristics of each support type are analyzed.The effect of the support filling distance of the block-shaped support based on Magics on the forming quality of the parts is mainly studied.The forming effect of the parts with different support filling distances at various stages is analyzed,and the optimal support filling distance of the part forming is given.The support addition rule is proposed for SLM forming of parts.According to the above research results,the support of typical parts is added and thedeformation of the simulated parts is compared and analyzed with the results obtained by the automatically added support mode.It is found that the parts formed by the support mode designed after parameter optimization are better.(4)Take a certain type of satellite radiator as the design object to achieve weight reduction of parts.In the 3D modeling process,the feature structure of the part is retained,the elements that affect the finite element analysis are removed,and the part model is simplified.Perform finite element analysis on the model to analyze the deformation of the parts.Topological optimization software is used to optimize the part structure,with the maximum overall stiffness as the optimization target,and strength and stiffness as the constraints.Topological optimization analysis is performed,and the resulting structure weight is reduced by 64%.The main transmission path of the optimized structure is clear,and the surface smoothing is done through the software.(5)To realize the SLM molding of a certain type of satellite radiator lightweight structure.For SLM molding of a lightweight structure of a certain type of satellite radiator,materials and equipment are selected,and supporting structures are added according to the result of lightweighting of parts.Finally,SLM molding of parts is realized to verify the rationality and machinability of structural optimization.