导　　师： 黄虹

学科专业： 080503

授予学位： 硕士

作　　者： ;

机构地区： 重庆理工大学

摘　　要： 挤出吹塑成型由于生产成本低、成型性能优越、适应性强等特点,广泛应用于各种中空容器以及一些复杂工业制件的成型。但挤出吹塑成型制件普遍存在壁厚不均匀的问题,严重影响制品的质量和使用性能,已成为制约挤出吹塑成型发展的最大瓶颈。 本文以挤出吹塑成型制件——宗申公司1P65油箱为主要研究对象,全面的分析了影响其壁厚分布不均的主要因素,针对性地提出了口模异型化设计的优化方案。首先,对挤出吹塑过程中聚合物的流变行为进行了讨论和研究,为挤出口模异型化设计提供了理论依据。其次,根据异型口模凹槽的形状、尺寸、位置和数量等基本参数,设计了多副不同的实验模具。通过大量对比实验,比较各实验模具挤出型坯和成型制件的情况,了解了不同设计参数对成型的影响,既论证了异型化设计方案的可行性,又为最终1P65油箱挤出口模的异型化设计提供了指导。第三,通过测量制件剖件各个位置壁厚、模拟制件成型过程,得到制件吹胀比和壁厚分布的相对关系以及制件拐角和凹槽位置的对应关系。在此基础上,通过大量的数学运算,完成了凹槽深度、凹槽宽度、凹槽相对位置等异型化口模关键参数的设计。设计制造出异型口模,通过大量的试模和优化过程,确定了最优的异型化口模设计方案。最后,对原口模和异型口模成型制件的壁厚分布情况进行了比较和分析,全面的讨论了异型化设计的效果,论证了口模异型化设计对优化制件壁厚分布的巨大作用,提出一种优化挤出吹塑成型制件壁厚分布的有效措施。 Extrusion blow molding are widely used in the molding of various hollow containers and many complex parts, because of its characteristics such as lower production cost, more superior in forming performance and stronger in adaptability. However, the problem of wall thickness nonuniformity, which is common in the extrusion blow molding products and affected the quality of products and the service performance seriously, has become the biggest bottleneck that restrict the development of extrusion blow molding. The thesis by taking an extrusion blow molding product, an 1p65 oil tank which made in Zong Shen company, as the main research object, analyzed the main factors that affecting its wall thickness distribution and offered an optimization scheme about the design of allotype die. At the first, studied the flow behavior of the polymer, which provided theoretical foundation for the design of the die. Secondly, based on the basic parameters of the groove such as the shape, size, position and amount, we made some different experimental dies and did a lot of contrast experiment, to compare the condition of the extruded parison and forming parts that formed by different dies. By analyzing the effects of different design parameters on the forming,we had gotten the feasibility of the design scheme, as well as provided guidance for the design of allotype die for the 1p65 oil tank. Thirdly, we obtained the relative relation between blow-up ratio of products and the wall thickness distribution of the products, as well as the corresponding relation between corner of the products and the position of the groove by measured the wall thickness of the parts and simulated its process of the forming. Through mathematical analysis, we completed the key position design of the allotype die such as the depth, the width and the relative position of the groove, designed and made the allotype die. Then, we determined the best optimization scheme through test mould and optimization. At last, we analyzed and compared the condition of the

关 键 词： 挤出吹塑 壁厚分布 口模异型化设计 优化

领　　域： [化学工程]