Validation study of an analytical model of FDM accuracy
Title(original): Validation study of an analytical model of FDM accuracy
Authors: G. Percoco, L. M. Galantucci, F. Lavecchia.
Keyword: Fused deposition modelling; Rapid prototyping; Assembly.
Purpose: Influence of working parameters on FDM dimensional accuracy, paying particular attention to variables that can affect axial symmetric mating between parts, and how these parameters can be set to improve the mating process.
Methodology: In this paper the fabrication tolerances of FDM prototypes have been studied using an experimental approach, oriented to shaft-hole mating. The experimentation has been conducted on two levels, the first one to verify a theoretical approach found in literature that showed to be adequate essentially for work-pieces fabricated with the solid strategy and without cavities. As a consequence, the second experimental level was conducted to identify factors influencing the accuracy of production of workpieces with cavities and sparse deposition strategies.
Findings: Hollow parts resulted to be influenced essentially by the size of the hole, whereas the shafts were not affected by the size, probably due to a correct application of the shrinkage correction factor. A shrinkage model from literature has been tested giving correct results with solid parts but poor results for hollow and sparse parts.
Practical implications: additive Manufacturing (AM) techniques are well known throughout the world and are often used in the manufacturing of products, as they help to significantly reduce time to market. Fused Deposition Modelling method is particularly interesting because it extrudes mainly recyclable thermoplastics, thus addressing the growing concern about the environment. Among the extrudable materials, one of the most widely employed is ABS, which is ideal for conceptual prototyping through design verification, and is available in a variety of standard and custom colours. Manufactured items ready for shipment and sale may be the final product, or sub‐assembly, or components that must be assembled together.
Full reference: PERCOCO, G.; GALANTUCCI, L. M.; LAVECCHIA, F. Validation study of an analytical model of FDM accuracy. DAAAM International Scientific Book, 2011, 585-592.
Link: https://www.daaam.info/Downloads/Pdfs/science_books_pdfs/2011/Sc_Book_2011-048.pdf
