3D Printing Process And Mechanical Properties Of Test Pieces For ABS Material

With the development of science and technology and the cont inuous advancement of societ y,the development speed of the manufacturing industry is accelerat ing.The products produced are increasingly complicated and personalized,and how to manufacture products quickly and accurately has becom e an issue of increasing concern.The traditional machining methods include turning and milling,etc.These processes require not only a series of tools,fixtures and mo lds corresponding to the product model,but also a process of reducing the raw materials for each process,result ing in a large amount of raw material waste and a prolonged production cycle.In contrast,Addit ive Manufacturing(AM),also known as 3D print ing technology,has developed rapidly in recent years.By accumulat ing materials layer by layer,3D CAD models can be quickly converted into 3D solids.The model can quickly and precisely manufacture parts of any complex shape on one piece of equipment,realize the "free manufacturing" of the parts,solve the forming problems of many complica ted structural parts,greatly reduce the processing steps and shorten the processing cycle,improve the efficiency of processing.In this paper,acrylonitrile-butadiene-st yrene terpolymer(ABS)print ing wire is used as print ing material and research object,and fused deposition molding suitable for polymer 3D printing is selected.Fused Deposition Modeling(FDM)technology for ABS print ing process explo ration and mechanical test piece preparation,combined with NX12 3D modeling software to build the model o f the fluid in the nozzle,and further to the three flow fields(temperature field,Dynamic simulat ion analysis of velocit y field and pressure field)was carried out,and the flow field distribution and variat ion in the nozzle under different print ing temperature and printing speed were systematically studied.Through numerical simulat ion analysis combined with the characterist ics of ABS material,the ideal printing temperature of the material in 3D printing process is given.Through the experimental resear ch method,the mechanical properties of 3D printed specimens under different print ing condit ions(print ing speed,layer thickness and filling rate)were analyzed in detail.First ly,using the orthogonal design method,a three-level three-factor design based on the above three print ing parameters was designed.To reduce experimental error,several sets of tensile,compression,and bending specimens were printed for each set of designs.Through the comparat ive analysis method,the compressive mechanical prope rties,tensile mechanical properties and bending mechanical propert ies of the specimens under different print ing condit ions were systemat ically studied.Through the numerical simulat ion of the flow field in the 3D print ing nozzle under different print ing condit ions,the influence of print ing temperature and printing speed on the flow field in the nozzle was studied in detail.Through the study of the mechanical properties of the test pieces under different print ing condit ions,the influence degree of each p rinting parameter on the mechanical properties of tensile,compression and bending was clarified,in order to provide a reference for the subsequent select ion of 3D printer parameters.