Research On Key Technology Of Multi-Gap Cavity Structure Forming Based On SLM

3D printing technology has strong designable ability,which can realize the integrated manufacturing of complex parts,and has advantages for the formation of multi-gap internal cavity structural parts.The processing of part data directly affects the quality and efficiency of the forming.However,the current method does not solve the problems caused by the forming,so this paper studies the processing of the part model and proposes a new solution.The main research contents are as follows:1)Based on the traditional redundant data removal method,the area limited redundant data removal method is proposed.Firstly,the structural characteristics of the model's STL file are analyzed.Then the redundant points could be retraced and re-weight by limiting the geometric size.After reading STL files and establish a digital model.The method can remove redundant points efficiently and stably,and improve file processing speed.At last,the part forming quality requirements are analyzed,the direction objective function is established,and the layering direction of the parts is determined.2)Based on the adaptive layering algorithm of relative area deviation ratio,a new adaptive layering algorithm is proposed for the characteristics of multi-cavity structure.Firstly,the characteristics of multi-cavity structural parts are analyzed,and two discriminants of the structural features are proposed.The adaptive layering algorithm based on area deviation ratio is optimized to effectively solve the problem that slice area change rate is zero.Finally,using the nearest distance analysis algorithm to correct the defects such as open loops appearing in the layered contour to obtain a smooth and defect-free curve contour.3)According to the traditional method of spot radius compensation,a variable spot radius compensation strategy is proposed in this paper.Through the analysis of the energy distribution of the laser source,it is found that different thicknesses of heat affected zone will be generated in the laser scanning process under different layer thicknesses.Therefore,according to the optimized adaptive layer thickness,the thermal influence size of different layer thicknesses is determined in the experiment,then the spot compensation amount is determined,and different spot thicknesses are compensated by different spot compensation amounts to improve the surface quality of the parts.In this paper,based on the analysis of multi-cavity structure features,the data processing of model is studied based on SLM technology.In this paper,the millimeter-wave antenna with multi-cavity structure is taken as the research object.The adaptive layering algorithm and the variable spot radius compensation strategy proposed in this paper are verified by experiments.Under the premise of ensuring the forming precision,the forming speed of parts can be effectively improved.