Design And Experimental Study Of Fused Deposition Modeling Screw Extrusion 3D Printer

Fused Deposition Modeling(FDM),as one of the 3D printing technologies,has the advantages of simple structure,convenient operation and low cost.At present,FDM 3D printing equipment in the market mostly uses silk as raw material,and there are problems such as silk making and single material selection.To solve these problems,a Fused Deposition 3D printer is trial-produced by using screw extruder nozzle,and the fluid simulation and polypropylene printing experiment research are carried out.The main research contents are as follows:(1)Design and trial production of screw extrusion 3D printer.A 3D printer model of fused deposit screw extrusion was designed based on the principle of fused deposit and screw extrusion technology.The design and modeling of key components such as fixed mechanism,moving mechanism,extrusion mechanism and leveling mechanism are mainly carried out,and the static and dynamic characteristics of finite element analysis are carried out(2)3D printer control system design.According to the simulation results,the printer model was improved,and the experimental platform of the screw extrusion 3D printer with a printing range of 210mm×210mm×240mm was built.The motion controller and PLC were used to control the printing process.The servo motor and stepper motor are used to control the movement of each axis of the printer and the rotation of the screw.The temperature adjustment range within 500℃ of the heating element meets the temperature conditions required for material melting.The use of the touch panel realizes human-computer interaction and makes the operation easier.(3)The motion of molten material in the barrel was investigated by fluid simulation.Finite element software was used to simulate the flow law of molten material in the flow channel,and the changes of pressure field,velocity field,shear rate field and viscosity field formed when the screw speed was 5rpm,10 rpm,15rpm and 20 rpm were studied.The results showed that the increase of speed was conducive to improving the pressure building capacity of the screw and the shear effect on the material(4)Polypropylene printing experiment.The calibration of zero return,temperature control and motion accuracy control was carried out,and the overflow and swelling of extrusion materials were studied.By changing the printing parameters and conducting different experiments,the material can be extruded and formed on a hot bed.The experimental results show that the overall design of the screw extrusion 3D printer is reasonable and the printing scope is wide,which can meet the requirements of product molding,and the use of granular material reduces the process of raw material making,which is also conducive to solving the problem of limited material selection.