【作者】 邹武；

【导师】 唐跃；

【作者基本信息】 青岛科技大学 ， 机械电子工程， 2007， 硕士

【摘要】 随着计算机技术、高分子材料成型技术、机械制造技术的飞速发展，CAD／CAM、CAE技术已逐渐应用到工业生产中，高分子材料由于其优越的使用性能也已经渗透到各个应用领域。在高分子材料成型加工中，怎样利用CAE技术提高高分子材料的使用水平、高分子材料产品质量以及生产率仍然是工程师当前的首要任务。本课题围绕快速换径管材新型结构及挤出成型研究这一主题，以高分子材料加工工程学、聚合物熔体流变学、聚合物加工传热学等多学科理论为基础，在计算机模拟分析与实验研究基础上，研究分析了塑料管材挤出的成型规律，从理论到实验全面研究分析了快速换径新型结构的可行性，为提高管材的生产效率和高分子材料的使用水平做了探索性的研究。本研究首先从理论上分析了熔体在管材口模模腔中的各物理量的分布规律，然后以这些理论为依据设计了一套符合适合快速变换要求的管材口模，并对此口模的结构进行了优化设计和严格的校核。随后用ANSYS软件的CFD fluid模块，对熔体在口模流道内的流动情况进行计算机流动分析和动态流动模拟，直观和形象地描述了管材挤出模流道内的熔体压力场、速度场、粘度场、壁面剪切应力场的分布情况，在模具投入生产之前预测口模流道内熔体流动行为。该分析确定了挤出管材口模成型段关键的几何参数、不同的边界条件对熔体挤出速度、质量的影响规律，为口模结构优化设计以及工艺参数的控制提供理论和实验指导，并在此基础上修正调整了模具设计参数与流道不同的入口参数条件，确定了实验条件下合理的模具几何结构，也为选择实验研究的参数提供了参考。最后，以理论设计和模拟分析为依据，设计并加工了管材挤出口模，并对HDPE进行了试验，由所得实验数据进一步分析了螺杆转速、口模成型段壁厚、机头温度对挤出产量、机头压力和挤出胀大的影响。本研究以计算机模拟与结构设计、试验研究相结合，不但提高了结构设计的效率、减少了实验的盲目性，而且对比分析了模拟分析结构与试验结果，以实验数据验证了该新型结构可行性与合理性，使研究结果具有重要理论及实际工程意义。更多还原

【Abstract】 Along with the rapid development of the computer technology, the high polymermaterial molding technology, the machine manufacture technology,CAD/CAM andthe CAE technology has gradually applied in the industrial production, the highpolymer material because of its superior operational performance also already seepedto each application domain. In the molding processing of high polymer material, howto enhanced the use level of the high polymer material by using the CAE technology,the high polymer material product quality as well as the productivity still was thecurrent most important task of engineers. This subject revolves the theme of a newfast-changing diameter structure and the extrusion processing research of tube dies,and take the high polymer material processing engineering, the melted-polymerrheology, the polymer processing heat transfer studying and other multi-disciplinarytheory as a foundation, the research analyzed the rules of the tubes extrusionprocessing In the basis of the computer simulation analysis and the experimental study.It take a comprehensive research about the feasibility of the fast-changing diameterstructure from the theory to experimental analysis, and also have done a explorationresearch In order to enhance the molding production efficiency and the high polymermaterial use level.This research first theoretically analyzed every physical quantities distributed rule ofthe melted polymers in tube dies mold cavity, then designed a set of tube die moldwhich conform to this topic request according to these theories, And has carried on a optimized design and a strict examination to this kind of type tube mold structure.Afterwards using the CFD fluid module of ANSYS, make a computer-aided flowanalysis about the flowing situation in tube dies channel and a dynamic flowingsimulation, Direct-viewing and vividly described the distributed situation of thepressure field, the velocity field, the viscosity field, the wall shear stress field of themelted polymer flowing in the tube dies channel,It forecastedly simulates flowingbehaviors of the melted polymers in the tube dies mold. Before these put intoproduction. Finally, in the according of theoretical design and the simulation analysis,designed and processes the set of tube dies mold, and has carried on the experimentwith a kind of HDPE, further analyzed relations between the screw rod rotationalspeed, the wall thickness of molding section,the dies temperature and the extruderoutput, the pressure of the tube dies,extrusion swells by the obtained experimentaldata.With the work of the computer-aided simulation and the structural design, theexperimental study, This research not only enhanced the structural design efficiency,reduced the blindness experiment, moreover has contrastedly analyzed the simulationanalysis structure and the experimental results, the experimental data has confirmedthe feasibility and the rationality of this new structure, enabled the findings to have theimportant theory and actual project significance.更多还原