Optimization Of Support Structure And Technology Research Based On Selective Laser Melting

Selective laser melting technology breaks through the traditional technology on the type of material restrictions,directly manufacturing the parts with density of nearly 100%,with good dimensional accuracy,surface quality of the parts.The mechanical properties of the part which fabricated by selective laser melting technology,can be quite with the forgings,being widely concerned by the industry.Chosing the support structure correctly,directly affects the success rate and quality of the part.Being based on the production of SLM technology,focusing on the efficiency and quality,the research was curried on.Through the experimental analysis,the paper system discussed the support structure optimization and the method to add the support structure in the SLM progress.In this paper,the support structure of the AlSi10 Mg material during the production process is studied from the aspects of the function of support structure,the way of how to select the support structure and support structure parameters.First of all,through the SLM Solutions M280 equipment produce the specimen with different X/Y spacing and different filling teeth.Then to characterize the bottom of the filling teeth X,Y spacing changes,the bottom of the specimen collapse,a 3D profiler is used to establish the three-dimensional profile of the bottom of the specimens.So we clearly get the selection range of the teeth parameter and X/Y spacing.Secondly,based on the software of Magics 20.0,the main parameters such as tooth width,tooth height,tooth root width and filling distance in block support were used to carry out orthogonal experiments.Then the influence of the width,tooth height,tooth width,filling distance and the support density on the block support structure performance is characterized.The Comsol software is used to simulate the distribution of heat field under different supporting parameters in the process of machining.Finally,the optimized parameters are obtained by considering the results in all aspects,and further verified by examples.It is found that the optimal interval of X / Y spacing is 1.5~4mm.through the experiment.As well as the main factors that determine the degree of support removal and the degree of deformation of the part are X/Y spacing and tooth width respectly.And there is no obvious interaction between the above two factors.The optimal support selection parameters are also abtained by the orthogonal experiment.Namely,the tooth height is 1mm,the tooth width is 0.7mm,the tooth root width is 1mm,the X / Y spacing is 4mm.Basing with the paremetres,the deformation degree of the part is obviously reduced,and the difficulty of removing the support is simplified.The simulation results of the thermal field distribution are in good agreement with the orthogonal experiments,and the limitations of optimizing the experimental parameters are explained to a certain extent.All in all,With the series experiment and practice in the process of prototyping the AiSi10 Mg alloy,the optimal selection interval is provided for the selection of the parameters in the 3D printing process.It also let us know how to choose the process parameter to keep the parts quality,the support structure removing easily and fabricate the part quickly.For the follow-up 3D printing produc with high success rate,high efficiency,providing a strong reference.And laid the foundation for the exploration of other 3D printing production processes.