Ratio of polymer temperature at the end of FFF/FDM 3D-printer nozzle to length of active (hot) part for various linear print speeds definition
This article describes the basic problems of FFF / FDM 3D-printing relates to the behavior of plastic melt in the hot part of the extruder. A more mobile and easily accessible technology for printing plastic products of complex geometric shapes based on FDM technology of 3D-printing developed by the scientific team of Perm National Research Polytechnic University is represented. A comparison of a standard extruder developed by the authors of the article is given. It is concluded that FDM technology has not fully revealed its potential due to a wide range of technical problems. The range of issues to be solved for the successful manufacture of plastic products using this technology is considered. Hypotheses and ways of solving problems are being put forward. Prospects of this technology are considered, as well as an assessment of its utility in production and for society. The methodology and results of modeling the behavior of the polymer melt inside the FFF/FDM 3D printer special shape nozzle are presented. SolidWorksSimulation was used as a modeling environment for determining the eveness of heating of the hot-end of a standard extruder and a new type extruder. To calculate the maximum polymer passage through the nozzle of the developed extruder under the condition of even heating of the hot-end (nozzle), an multi-physical axisymmetric mathematical model was constructed in the ComsolMultiphysics package, which containing a thermal and electromagnetic tasks. The simulation results allow to determine the ratio of print speed, length and temperature of the heated part for 2 types of polymer. This dependence can be used to control the temperature of the nozzle and the feed rate of the polymer thread directly during printing. Such regulation will ensure a higher quality of manufactured objects.