Study On ABS-PLA Melt Deposition Composite Ultrasonic Vibration Molding

As one of the 3D printing technologies,Fused Deposition Modeling,FDM)has been applied in many fields because of its many advantages.Although the application prospect of FDM is broad,the manufacturing principle of this technology limits the upper limit of mechanical properties of FDM molded parts.Compare with injection-molded parts made by mould,it has that problem of insufficient strength caused by poor adhesion between two adjacent wires.In order to better integrate the excellent properties of acrylonitrile(A),butadiene(B)and styrene(S)copolymer(ABS)and polylactic acid(PLA)and improve the mechanical properties of the materials from the point of improving the adhesive strength inside the molded parts,this paper puts forward ABS-PLA melt deposition composite ultrasonic vibration molding technology,which combines ultrasonic vibration technology with melt deposition molding technology to improve the mechanical properties of products,which is of great significance to broaden the application of this technology in engineering fields.The specific research contents are as follows:Firstly,the original nozzle was mapped according to the original scale by using three-dimensional modeling software,and its flow channel was improved.The nozzle was simulated and analyzed by Workbench software,and the nozzle was analyzed from three aspects: the distribution of fluid temperature field,the influence of temperature on velocity field and the influence of temperature on pressure field.The results show that nozzle temperature and molding speed will affect the temperature field distribution in the fluid,and temperature will also affect the velocity and pressure of the fluid in the channel.Therefore,the nozzle temperature and molding speed should not be too large or too small.The optimal molding temperature is 230℃ and the optimal molding speed is 60mm/s through simulation.Then,the polymer materials of ABS and PLA are modeled by MS software,and the process of ultrasonic vibration-assisted molecular chain fusion of ABS and PLA is analyzed by LAMMPS software.The molecular fusion,atomic trajectory,potential energy and interaction energy were studied respectively.In the process of molecular fusion,it was found that the molecular chain fusion was better after increasing vibration under the same conditions,which made the mechanical properties of the material better.Finally,on the basis of the original FDM equipment,the ultrasonic-assisted vibration system was added,and the nozzle structure and the internal code of the molding equipment system were changed,so that the molding equipment suitable for the experiment of this paper was manufactured.The influence of ultrasonic vibration on the mechanical properties of materials was studied from a macro perspective by using the improved equipment.Through single factor experiments,it is found that the mechanical properties of the material are improved after adding ultrasonic vibration.The correctness of the finite element analysis results is verified by experiments from two aspects: the influence of molding speed and heating temperature on the mechanical properties of materials.The tensile and compressive properties of ABS-PLA were analyzed by Taguchi test method.By analyzing its signal-to-noise ratio and main effect,the degree of various factors affecting tensile and compressive strength within the test range was obtained,and finally the parameter combination under the optimal tensile and compressive strength was obtained.The optimal parameters obtained by Taguchi test were verified to be effective through experiments,which provided some reference for the subsequent ABS-PLA composite molding.