Influence And Prediction Of Selective Laser Sintering Process Parameters On Forming Accuracy

Selective Laser Sintering(SLS)mainly has the problems of low precision of molded parts and low surface roughness of molded parts.Reasonable process parameters can effectively reduce defects such as warpage and step effect of SLS molded parts.It is of great significance to improve the molding accuracy.In this paper,the SLS process parameters are taken as the research object,and the forming precision is taken as the optimization target.From the molding process,the model processing error,sintering process error and post-processing error are analyzed.Three evaluation indexes of SLS molded parts are established,and the process parameter test is designed.The variation of the process parameters on the forming accuracy is obtained.The influence of different parameters on each molding precision is analyzed,and the optimal processing parameter range is obtained.The results show that the forming precision reaches the optimal value when the processing parameters are laser power20-25 W,scanning pitch 0.2-0.25 mm and scanning speed 3000-3500mm/s.A method for predicting the molding accuracy using the planar laser energy density is proposed.The scanning mode and the scanning distance are considered as one of the influencing factors of the planar laser energy density.A mathematical model of the planar laser energy density is established,and a prediction accuracy model is obtained by regression analysis.,Predict the actual machining accuracy through prediction equations.The results show that the prediction function can control the ratio between the prediction size error and the test size error within 10%,and the function and its corresponding test method can guide the actual production in the molding of the error within 0.01 mm.