Experimental Study On Ultrasonic-assisted Fused Deposition Modeling Additive Manufacturing

Fused deposition additive manufacturing technology,also known as fused deposition modeling,is one of the most widely used additive manufacturing technologies in the world,and is widely used in the automotive industry,medical and health care,education and construction.Due to the limitation of the forming principle,the bonding strength at the bonding interface between the wires of the printing parts is weak,resulting in weak mechanical properties of the forming parts,which limits the wider application of the fused deposition modeling additive manufacturing technology.Therefore,this paper proposes an ultrasonic-assisted fused deposition modeling additive manufacturing technology,which combines ultrasonic vibration technology with fused deposition additive manufacturing technology to improve the bonding strength at the joint interface of adjacent wires in the formed part,thereby improving the mechanical properties of the printed parts.Broaden the application fields of fused deposition additive manufacturing technology.The research contents are as follows:Based on ultrasonic post-processing enhancement techniques,the effects of ultrasonic welding time and ultrasonic plastic welding strengthening pressure on the bending performance and dynamic thermomechanical properties of the printed parts were studied.Studies have shown that after ultrasonic plastic welding,the bending properties and storage modulus of the samples are significantly improved,and the bonding area between the internal wires is also significantly improved.The ultrasonic vibration assisted fused deposition additive manufacturing device was developed to enhance the mechanical properties of the sample during the forming process.Based on the new device,the influence of process parameters such as ultrasonic amplitude,printing layer thickness and printing speed on the mechanical properties of the sample was studied.The change of the cross-section morphology of the part was observed by scanning electron microscopy,the crystallinity and glass transition temperature of the part were analyzed by differential scanning calorimetry,further explore the mechanism of the process parameters on the mechanical properties of the sample.Studies have shown that as the ultrasonic amplitude increases,the tensile strength and bending modulus of the sample gradually increase,the bending strength first increases and then decreases slightly,and the bonding effect between the inner wires becomes better and better.Comparing the mechanical properties of the 12?m ultrasonic amplitude sample and the ultrasonic amplitude sample without printing the different printing speeds,the mechanical properties of the printed sample with 12?m ultrasonic amplitude are significantly improved,and the internal wire is between the wires.The bonding effect is better.In the process of ultrasonic vibration assisted fused deposition modeling,a certain amount of heat is generated on the surface of the sample.The surface temperature changes during the forming process of the sample under different ultrasonic amplitude,printing layer thickness and printing speed were studied.Studies have shown that under the same 3D printing parameters,when printing to the same number of layers,the surface temperature of the ultrasonic vibration sample is higher than that of the ultrasonic vibration sample.Aiming at the phenomenon of heat generated by ultrasonic vibration assisted fused deposition modeling process,the mechanism of its influence on the mechanical properties of the sample was studied.Replace the ultrasonic vibration system of the newly developed device with a heating substrate system.Under the same 3D printing parameters,the substrate is heated to simulate the temperature change of the ultrasonic vibration printing of the sample to print the sample,and the tensile strength,bending strength and flexural modulus of the sample are analyzed.The change of the cross-section morphology of the part was observed by scanning electron microscopy,the crystallinity and glass transition temperature of the part were analyzed by differential scanning calorimetry,further analyze the reasons for the change in mechanical properties.Compared with the ultrasonic vibration enhanced sample,further analyze the mechanism influence mechanism of ultrasonic vibration to strengthen the mechanical properties of the sample.Studies have shown that the addition of simulated temperature treatment effectively improves the tensile strength of the specimen,but the bending strength and modulus are reduced.Under the same 3D printing parameters,the substrate is heated to simulate the temperature change of 12?m ultrasonic amplitude printing of the sample to print the sample,the tensile strength,flexural strength and flexural modulus of the samples were both lower than those of the ultrasonic amplitude printed samples with the same 3D printing parameters plus 12 ?m.