Conditioning the structure of deposited layers by hybrid thermal source in FFF 3D printing
Keywords:3D printing, hybrid thermal source, infrared beam, visual testing, DSC analysis, infill density
The paper presents the results of some research that aims to highlight the possible changes of the material deposited by 3D printing, when a hybrid heating source is used. The introduction of the second source produces changes in the deposited material, both from the point of view of the mechanical characteristics and from the point of view of the structure of the deposit. The use of an IR lamp to create a hybrid heating system produces a local increase in temperature between 28oC and 53oC, for distances between the IR lamp and the piece to print from 200 mm to 400 mm. This increase changes the height and width of the deposit, changes the state of the deposit surface making it less shiny, and changes the edges or limits of the holes, making them clearer. The visual testing and the DSC thermal analysis of the deposited material showed that the effects of these changes are positive, in terms of the decreasing of the discontinuities, and they are negative, in terms of the decreasing of the material plasticity. In conclusion, a hybrid heating during the FFF 3D printing process is possible; important is the appropriate dosage of the additional amount of heat.
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