Based On The Experimental Research Of Fused Deposition Forming Process And Its Application In Upper Limb Prosthesis

Fused deposition forming technology is the most constantly used additive technology in three-dimensional printing forming technology.Compared with traditional machining,its outstanding advantage is that it can generate more complicated parts at one time.High polymer materials are mostly used as molding materials,which are low cost,low density and environmental protection.The article focused on this new technology and applied it to the project of laboratory upper limb prosthetics.Due to the limited information of the laboratory on fused deposition forming technology,whithout normative instructions for the processing parameters of different printers and limitations in applying to the production of upper limb prostheses.This article summed up the impact of workpiece accuracy deviation factors through the reference to the relevant literature and related technical support,simulation analysis and a large number of tests,the initial solution to the problems that emerged during the test.This article analyzed the impact of FDM precision factors on the theoretical and experimental point through the DF-G450 single-head fused deposition printer for experimental research.Firstly,preferred value range of part process parameters were obtained and solutions to the problem were analized from the machine hardware system,Solidworks three-dimensional model drawing accuracy,process parameters set by Cura software involved in the pre-processing of the process;Secondly,the main influencing factors were analyzed from the process of processing and after-cooling treatment involving the factors such as the speed,actual width,cavity temperature,nozzle temperature,filling density,and support of the nozzle.And the third,fourth and fifth chapters were focused respectively on:(1)The influence of supporting process parameters on support surface accuracy and dimensional accuracy were studied through orthogonal test method,and the corresponding optimal parameter selection scheme was obtained;(2)The DF-G450 optimum cavity temperature required when PLA as a printing consumable was obtained based on ANSYS temperature field analysis of the upper limb prosthetic components;(3)Study the effects of filling density on the parts through comparative experiments,analyze the relationship between filling density and print time,filling density and materials,through MATLAB to make the corresponding regression equation.The influence of this factor on the accuracy of the product is studied,the difference in the shrinkage of the part is analyzed,and the rules are summed up to introduce a quantitative compensation formula.A complete set of processing parameters suitable for DF-G450 is finally established combining the theoretical basis,analysis of simulation and a large amount of test data and the summarized optimization parameters are applied to the forearm of the upper limb prosthesis,physical printing is performed,and verify the feasibility of various optimization parameters.It has important guiding significance for follow-up research and personalized application.