Abstract
The article presents theoretical and experimental research methods that were used at the Technical University of Cluj-Napoca (TUCN) to improve the accuracy of Fused Deposition Modeling (FDM) 3D printing process. Finite element analysis method was successfully used for estimating the shrinkages of an original calibrating part that has been originally conceived for this purpose, this part being finally made using an original software application and FDM 3D printing equipment at TUC-N.
Highlights
The accuracy desired of a 3D printed part depends heavily on the design of the part
The research presented on this article was focused on improving the accuracy of the Fused Deposition Modeling (FDM) 3D printing equipment from Technical University of Cluj-Napoca, by analyzing and developing of a calibrating software application and an originally calibrating part that has been conceived for this purpose
An original calibrating part was conceived for the calibration of the 3D printing process and finite element analysis (FEA) was done to estimate the thermal shrinkages that occur in 3D printing process
Summary
The accuracy desired of a 3D printed part depends heavily on the design of the part. Variations in cooling and curing will result in big internal stress that can lead to failure, warping or shrinkage [1]. Since there is a small amount of filament types available on the market, such as: ABS, PLA, PET, Nylon, TPU, PC [3] there are several ways to adjust the theoretical values needed in such manner that the printed dimensions will be at the end as close as possible to the desired dimensions designed using CAD programs [4]. Finite element analysis methods and software applications (programs) are successfully used to determine scale factors needed to compensate the shrinkage of the printed parts [5]. Calibrations procedures and calibrating parts need to be used in combination with these methods in order to reach the optimum technological parameters in closed connection with the desired accuracy at the end [6]. The results reached using the conceived software application were used in the 3D printing process of a cogwheel for a photo tripod at the end
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