Influence of bed temperature on shrinkage, warpage and infill properties of pla and abs fused deposition modelling parts
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Date
2019-07
Authors
Amirah Azwani Binti Rosli
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Abstract
This research aims to investigate the influence of variation of bed temperatures on the deformed shape of various poly(lactic acid) (PLA) and acrylonitrile butadiene styrene (ABS) parts produced from Fused Deposition Modeling (FDM). Printing was conducted at a fixed nozzle temperature of 210°C and 240°C for PLA and ABS filament, respectively. While bed temperatures and part shapes were varied accordingly to examine warpage, shrinkage and infill properties. The parts were printed into three different bed temperatures; 60°C, 70°C and 80°C for PLA, while, 90°C, 100°C and 110°C for ABS. Changes of crystallinity of PLA and glass transition temperature of ABS printed part with different bed temperatures were examined using Differential Scanning Calorimetry (DSC). It was found that with increasing bed temperature, the warpage and shrinkage reduced in both types of polymer filaments while crystallinity of PLA and glass transition temperature of ABS increased. Shrinkage has also more pronounced in thin sample compared with thick sample might due to lower thermal contraction in the thicker sample. Samples of different heights with fixed infill density indicated variation trend of density and shell layer thickness with different bed temperatures and type of filaments.