| 3D printing technology as an emerging technology in the field of rapid prototyping.Fused Deposition Modeling rapid prototyping technology is a 3D printing manufacturing process main form,Its manufacturing process for its highly flexible,Parts structural complexity and these market demand adaptability Making it most widely used in add material manufactured by one of rapid prototyping technology in the future,and plays an important role in rapid prototyping and rapid tooling manufacturing.3DPrinthead is the key component of FDM-3D printing add material manufactured technology.The aim of this research was to analysis the reason of the 3Dprinthead’s poor precision and easyer blocking wire caused by its irrational thermal structure and the Printing Supplies’ s Unstable Phase transformation in its Fuse channel during the 3D printing process.Using structural optimization method Thermodynamics of Finite Element Analysis method to explore the reason of poor fabrication precision and blocking wire for print silk material in the3 Dprinthead molten phase transition instability caused by 3DPrinthead.Provide technical support for the theory of 3D printing technology industry.The main content of this thesis is as follows:1. By studying the fused deposition type 3D print-head’s structure and principle introduces it’s categories, on this basis study the FDM-3Dprinthead structure,we divided FDM-3Dprinthead into different areas according to it’s printing operation,to construct FDM-3Dprinthead location area, feeding area, the fuse area and increasing material area.Determined the research objective and the need to research of FDM-3Dprinthead structural parameters of this paper.2. Research of FDM-3Dprinthead’s process of silk feed mechanism.With Finite Element THERMAL module and FULID CFD module to assisted analysis the print silk thermal coupling analysis of ABS material with silk material melting process in the nozzle throat passage.Simulation silk material phase change process over time and extrusion process in the channel temperature field, velocity field, pressure field,through research of the three fields data with this relationship,reach conclusion how to draw a smooth spinning FDM-3Dprinthead control process and the desired temperature conditions and pressure conditions.3. Printing precision based on finite element analysis 3D print heads.Through the current three-dimensional modeling on the market two FDM-3Dprinthead and thermodynamic simulation analysis,results affect the accuracy of sensitive parts of the print layout and thermal effects on the material deformation.On the basis of simulation data summary,to propose to make a theoretical groundwork for the accuracy of the print heads print design optimization.4. FDM-3Dprinthead’s structural optimization design.For the two key technologies of asyer blocking wire and poor fabricate precision,by Through the above research of to protect the3 Dprinthead when molten material is required to smooth out the specific pressure, speed,temperature and control relationships and influence of 3Dprinthead’s structure,then put forward scheme of optimal design;Based on this research the relationship with Extrusion pressure and calculation friction size between the guide wheel.And out of the nozzle manufacturing cost standpoint, redesigned the wire guide pulley mechanism.Finally, the actual manufacture of 3D print-head print and on-site experiments,based on simulation and actual experimental comparison Print,Determine the manufacture of new-style 3D print heads fused deposition manufacturing solutions designed to meet the requirements of this paper.5. Product design stereotypes and do print test,print productions show,according to further optimize printing test. |
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