Research On 3D Printing Layering And Path Planning Based On FDM Technology

Additive manufacturing technology is a new technology which appeared in the late 1980 s.In the development process of more than 40 years,additive manufacturing has gradually been applied to various industries in social life,and plays an indispensable role in today's production and life.Among them,FMD is often used in life production due to its simple operation,low processing requirements,and low cost.The molding accuracy of the printed part is related to whether it can meet the requirements of the application,but now many FDM moldings nowadays have a step effect on the surface of the molded part due to the layering method,and the influence of the filling path causes the molded part to warp and deform at the bottom corners,so that the molded part cannot meet some application requirements,so the research focus of this article is to improve the accuracy of the molded part by improving the layering algorithm and path planning method of FDM molding.The thesis give an account of the following points:(1)This thesis first introduces the principles,advantages and disadvantages of several kinds of 3D printing technology which are widely used nowadays,and focuses on the main process parameters of FDM technology and its global development status in recent years.(2)Compare and introduce the existing FDM layering algorithms.Based on the existing adaptive layering algorithms,analyze the shortcomings that some models cannot adapt to the global model,and use MATLAB to improve them,First perform a pre-layering process on any model to ensure the parameters and boundaries of the subsequent adaptive layering,and finally realize the global adaptive layering,and analyze the layering algorithm in the algorithm layering time,the maximum adjacent layer The area difference and average Ra value are the same as the improvement effect of common algorithms.(3)Optimize the FDM path planning method,contrast the superiority and defect of the widely used path planning methods,combine the good edge retention of the contour offset algorithm and the advantages of the spatial continuity of the Hilbert curve,and reduce the warpage in FDM Analyze the generation principle of the filling path,improve the cooling shrinkage during the filling process by optimizing the corners of the filling path,and finally use the quadratic Bspline curve to fit and optimize the Hilbert filling,generate the final filling path,and analyze the path in Optimization of printing time,warpage and the number of motor stops.(4)Verify the layering algorithm and path planning algorithm through experiments,and compare the effect of printing samples of different algorithms.Taking a rectangular parallelepiped sample as an example,compared with the sample printed using the Hilbert curve as a filled path,the sample printed using the path planning algorithm in this thesis has an average maximum warpage reduction of 60.7% and a 3.93% increase in printing efficiency.Taking the sample of a retort bottle as an example,the surface roughness of the sample printed using the layering algorithm of this article is about 40% higher than that of the sample printed using the traditional layering algorithm.