Analysis And Research On Optimization Of Process Parameters Based On FDM Rapid Prototyping

Fused deposition modeling(FDM)is a widely used technology in the rapid prototyping technology,with a wide range of processing,low manufacturing cost,compact equipment,high molding material utilization advantages.However,FDM rapid prototyping technology has many shortcomings,such as low precision forming parts,poor strength,slow forming speed and so on.Based on the theoretical analysis and a large number of process experiments,the molding process parameters were optimized to achieve high dimension precision,strength,molding speed.In this thesis,the formation mechanisms and main influence factors for data processing error before molding,molding process error and post-treatment error of FDM had been analyzed.Some practicable methods were proposed to solve these problems,which provided the theories foundations and instructional criteria for subsequent process optimization experimental study.The single factor experiment was used to arrange a large number of process experiments to study the effect of the filling interval and filling line width on the tensile strength of the FDM molded part.In the study of the effect of the filling interval on the tensile strength of the molded part,other parameters were kept constant,the filling interval parameter was set to 1,2,3,4,5,6,7,respectively and tensile strength was detected on income molded part.The results showed that tensile strength of molded part would decline with the rose of the filling interval parameter.The tensile strength of product was 15.097MPa when filling interval parameter was 1.The tensile strength of product was 11.039 MPa when filling interval parameter was 7.However,the smaller filling interval parameter would lead to slower molding speed and the parameters should be set according to the processing demand.In order to study the effect of filling line width on tensile strength of molded part,other parameters were kept constant,the filling line width parameter was set to 0.51mm,0.52mm,0.53mm,0.54mm,0.55mm,0.56mm,0.57mm,respectively,tensile strength was detected on the molding parts.The results showed that tensile strength of products would rose with the rose of filling line width.The tensile strength of product was 13.445MPa when the filling line width was 0.57mm.The tensile strength of product was 11.612MPa when the filling line width was 0.51mm.However,too large filling line width would result in filling line excessive accumulation in the molding surface,which affected the surface quality.The process parameters should be set according to the processing demand.'In view of the influence of FDM molding parameters on the molding quality,the X,Y,Z direction dimension precision,forming time,tensile strength in molded part were chosen as the optimization objective.On the basis of orthogonal table arrangement of a large number of experiments,the signal-to-noise ratio analysis and variance analysis method were used to study the influence of various parameters on a piece of each test objective in the molding.The optimal combination of process parameters for X,Y,Z direction dimension precision in molded part were A2B3C3D3E3F1,A2B2C2D2E3F2.A1B1C3D3E1F2.the optimal combination of process parameters for molding time was A1B3C3D3E2F3 and the optimal combination of process parameters for tensile strength was A2B2C1D3E2F3.Based on the results of orthogonal experiment and gray correlation analysis method,the optimal combination of process parameters were A2B3C1D3E2F1,and the effectiveness of the optimized process parameters were verified by experiment.The optimized process parameters have broad applicability and provid important reference value for the customer to setting process parameters.