【作者】 贾春红；

【导师】 甘学辉；

【作者基本信息】 东华大学 ， 机械设计及理论， 2009， 硕士

【摘要】 随着世界化纤工业在制造能力、技术设备、品种开发及产品质量方面的不断进步,进入21世纪,“新合纤”正朝着大容量、超极细的方向发展。我国的化纤产量虽一直位居世界前列,但由于在规模、差别化率等方面的瓶颈制约,产品国际竞争力不强,大容量的纺丝设备国内目前仍然依赖进口。化纤生产中纺丝组件性能的好坏,直接影响到原丝的可纺性和各种性能指标,因此大容量纺丝组件的设计和开发尤为重要。本论文首先分析了国内外纺丝组件的结构,并对纺丝组件中的分配板和喷丝板进行参数化设计;以流变学基本原理为理论依据,研究高聚物熔体在纺丝组件内的流动机理,建立了熔体在皮芯型喷丝孔中流动的速度数学模型,并用Gambit对皮芯型喷丝孔建立三维模型和网格划分,利用专用CFD软件—Fluent对熔体在其中的流动情况进行了模拟;对大容量皮芯型纺丝组件设计了两套分配板方案,分别对其进行建模、网格划分和熔体流动模拟,通过计算出口的速度不匀率控制在1.5%得出了合理的分配板结构,速度不匀率反映了所纺纤维的条干不匀率,这将为实际实验和生产提供一定的理论依据。最后,通过模拟所得参数和某公司的设计基础参数设计出一套大容量皮芯型复合纺丝组件,并结合该公司实际生产情况对低熔点棉生产工艺进行研究,取得了良好的效果。目前国内对纺丝组件的设计大多限于经验,大容量的纺丝组件设计国内还没有报道,本论文最大的意义在于打破了常规组件的设计思路,首次得到皮芯型双组分熔体流动特性的计算模型,并结合如今强大的计算机CAD/CAE功能,基本上实现了在计算机上设计并模拟纺丝,不但节约了实际生产成本又提高了效率,使纺丝组件的设计步入了一个新的阶段。更多还原

【Abstract】 Entering the 21st century, with the constant progress of the worldwide chemical fiber industry on manufacturing capacity, technical equipment, variety development and product quality, the new synthetic fibers are moving to the direction of large-capacity and ultra-fine. China’s chemical fiber production has been the forefront of the highest in the world, but because of the bottleneck restriction on scale, differentiation rate and so on, the product’s international competitiveness is not strong, and at present, the large-capacity spinning equipments still rely on imports. The function of spinning component immediately affects the fiber’s spinnability and various performance norm. So the design and development of large-capacity spinning component is particularly important. So the design and development of large-capacity spinning component is particularly important.This dissertation analyzed the structure of large-capacity spinning component, parametric designed for distribution and spinneret of the spinning component. According to basic theory of rheology and spinning technology, discussed rheological behavior of polymer melt when flowing in the large-capacity spinning component. Establishing velocity mathematical model of polymer melt flowing in the sheath-core orifices, then made 3D model and meshed them by Gambit, using the software of CFD-Fluent to simulate polymer melt flowing in the sheath-core orifices to find a reasonable dimension. Designed two sets of distribution system of large-capacity spinning components, made models, meshed and simulated the flowing respectively by Fluent to searching out reasonable distribution system of large-capacity spinning component. Unevenness of velocity was less than 1.5%, Unevenness of velocity expresses the fiber’ s Unevenness. This provide theory basis for experiment and production. Finally, we got the reasonable parameters by the simulation and designed a set of large-capacity sheath-core spinning component with the basic parameters of the company. This provided theoretical guidance for the company in production technology of low-melting point polyester. According to this, achieved some good results.Spinning components have been designed mostly by experience so far in internal, there has been no report about the designing of large-capacity spinning component until now in internal. This dissertation broke up the routine design method which was the most import. Combing with the powerful CAD/CAE capability of computer we can design spinning component by computer which save not only production cost but also increasing efficiency. So that the design of spinning component will enter a new stage.更多还原