Effect of FDM process parameters on dimensional accuracy of CF/PETG parts
Carbon fiber(CF)reinforced polyethylene terephthalate-1,4-cyclohexanedimethanol(CF/PETG)materials have been widely used in industries such as protective gear,lattice structure,and prosthesis manufacturing.Fused deposition modeling(FDM),a primary technique for forming complex parts,is extensively employed in additive manufacturing,but improper selection of process parameters can lead to lower forming accuracy of the parts.Based on commercial CF/PETG wire as raw material,experi-mental samples were fabricated via FDM process to investigate the effects of four main process parameters,namely nozzle tempera-ture,hot bed temperature,layer thickness,and filling rate,on the dimensional accuracy of samples.A L25(54)orthogonal experiment was designed,sample size measurement and error calculation were conducted,and range analysis was used to determine the optimal combination of process parameters in each direction of X,Y,Z and the order of influence of four factors.A comprehensive analysis method was employed to analyze the overall dimensional accuracy of the samples,and the order of factors was obtained as follows:hot bed temperature>layer thickness>filling rate>nozzle temperature.The optimal parameter combination was nozzle temperature 245 ℃,hot bed temperature 65 ℃,layer thickness 0.20 mm,and filling rate 10％.The 3D printing of CF/PETG plastic parts was performed using optimized process parameters,and the accuracy evaluation of the plastic parts was carried out through reverse accu-racy analysis method.It was verified that the optimized process parameters can provide data reference for the accuracy improvement of CF/PETG parts,and guide practical applications.
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