Simulation and Analysis of Mass Transfer Process of the Single Screw Extrusion Equipment Based on Polylactic Acid
[Purposes]This paper aims to study the mass transfer problem of desktop-level single-screw extrusion equipment suitable for small batch and personalized customized consumables.[Methods]Rea-sonable assumptions and simplification of the mass transfer process of polylactic acid granules were made,and ANSYS Workbench was used for the structural simulation and analysis,POLYFLOW was used for the simulation and analysis of the pressure field,velocity field and temperature field of the screw and barrel,and Fluent was used for the calculation and simulation of the temperature field of the nozzle and the thermo-pressure coupling.[Findings]The maximum deformation of the overall structure is 0.31 mm,and the maximum stress is 6.415 MPa;the flow rate of granular material in the screw and barrel is stable,without reflux or overflow;the temperature difference between the nozzle inlet and outlet is 1.1℃,and the corresponding deformation is 0.048 mm.[Conclusions]Through the above simulation analysis,it can be concluded that the structure can realize the continuous and uni-form extrusion of polylactic acid granules under the premise of guaranteeing the rigidity,which provides some theoretical support for the feasibility of desktop-level single-screw extrusion equipment.
structural design3D printingfinite element simulationwire extrusionPLA
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