The Study Of The Influence Of Temperature And Layer Thickness On Molding Quality And Molding Efficiency In FDM

As a kind of rapid prototyping technology,fused deposition molding technology has obvious advantages such as low processing cost,simple manufacturing process,high flexibility of manufacturing process and high complexity of molded parts compared with traditional processing technology.Therefore,it has wide application in manufacturing.However,the molding quality and molding efficiency of fused deposition molding technology have always restricted the development of this technology.This thesis studies the influence of temperature and layer thickness on the quality and efficiency of molding in fused deposition molding,and explores ways to improve quality and efficiency.It has important theoretical significance and application value.The specific work is as follows:A thermal analysis finite element model of the fused deposition process is established to determine the temperature field type,heat transfer mode,heat conduction equation and boundary conditions of the forming machine heating device.The three-dimensional geometric model of the heating device and the Ansys finite element model are established.The temperature field simulation analysis is carried out,and the temperature field cloud map and heat flux density cloud map of the heating device under different thermal loads are obtained.The simulation results show that the temperature field of the fused deposition molding is stable,the temperature field fluctuation during the molding process is small,and the heat supply can be continuously maintained to ensure the molding quality and molding efficiency of the molded part.The experimental platform of the fused deposition molding machine is established.The molding temperature is detected by the infrared thermal imager,and the temperature field distribution map of the molding process is obtained.The surface roughness,dimensional accuracy,tensile strength and flexural strength of the molded parts at different forming temperatures are tested by Leica DCM3D microscope and other measuring equipment.The influence of the temperature of the fused deposition on the forming quality and efficiency is obtained.The experimental results show that the higher the molding temperature,the better the quality of the molded part,and the time factor of the temperature rise and decrease process will reduce the molding efficiency.The adaptive layering algorithm based on the surface triangular surface normal vector of model STL format is improved by using the normalized processing method,which solves the problem of poor adaptive layering in the layering process.Simultaneous simulation analysis of the equal-thickness layering algorithm with 0.1mm and 0.3mm layer thickness,adaptive layering algorithm and improved adaptive layering algorithm by Matlab software shows that the number of model slices using the improved algorithm is reduced.The adaptation effect is significantly improved.The C++ language and Python language are used to compile and debug the adaptive layering algorithm and its improved algorithm based on the layered software Cura.The simulation results are verified by the fused deposition modeling experiment.The experimental results show that the improved adaptive layering algorithm can increase the molding efficiency by 22%and can reduce the surface roughness by 29%.