高压厚壁圆筒设计准则的可靠性分析

结合可靠性设计和概率设计理论，考虑了设计参数（压力，径比及材料机械性能）的不确定性，应用不同的强度设计准则，建立相应失效极限状态方程，对高压厚壁圆筒在相同设计工上可靠性进行计算和对比分析，并对各种设计参数不同强度设计准则下敏感性进行分析，本文结论对高压壁厚圆筒设计具有较为重要的参考价值。     

回归正交设计在PEK-C增韧酚醛树脂研究中的应用

采用计算机辅助回归正交设计的方法对酚酞型聚醚酮(PEK-C)增韧酚醛树脂进行研究，通过回归正交设计，对共混体系的组分配比和成型工艺参数进行优化，预测出最佳配比和工艺参数，并通过试验得到验证。     

水泥工厂三维设计中创建参数化族的方法

创建族是水泥工厂三维参数化设计的基础，它决定了三维工厂设计的质量和效率。文章介绍了利用AutodeskRevit软件平台进行水泥工厂三维参数化设计时创建参数化族的方法、步骤，族及族参数的命名规则以及创建族时应注意的问题和排除族故障和测试族的方法。实际设计中，应根据对象的具体情况采用不同的方法，实现族的灵活应用。     

氧化锌脱硫剂制备工艺参数的优化

应用ＲＰＤ稳健性设计技术对氧化锌脱硫剂的制备工艺参数，进行了优化设计。寻找出一组优化参数的组合。用此参数制备的氧化锌脱硫剂，不仅质量高，而且稳定性好。     

应用裂缝-油藏耦合技术的油藏水井压裂参数优化数值模拟

为得到油藏水井压裂过程的优化参数，设计裂缝-油藏耦合技术设计油藏水井压裂参数优化数值模拟方法。建立油藏流体等效模型，设计控制单元结构模型，在法向速度的连续方程中，得到应力矢量的基线方程，并计算变化方程的平均渗流速度，设置数值模拟边界条件，得到油藏水井压裂的应力曲线，分别对压裂液黏度、压裂液注入量、支撑剂用量3个参数进行数值模拟。实验证明这3个参数对水井裂缝宽度与长度有直接影响，因此可以通过调节这3个参数实现油藏水井压裂参数的优化。     

橡胶挤出机螺杆CAD前处理技术

以普通挤出机直的参数化程度设计为例，阐述在ＡｕｔｏＣＡＤ１２．０环境下进行二次开发的前处理技术，并人原理和实现过程进行了分析。该方法也适用于一般参数化设计。     

基于SolidWorks的冲压模参数化标准件库的开发

介绍了冲压模参数化标准件库开发的方法及设计思路，结合A型导套的实例，阐述了标准件模板和尺寸参数库的建立过程及设计方法，最后对系统实现零件自动生成的关键技术进行了讨论。     

运用约束变尺度法优化斜导柱尺寸参数

在模具斜导柱抽芯机构设计中，斜导柱的参数特别是倾角α的确定往往要凭借设计人员的经验选取，本文通过对斜导柱运动情况和受力进行分析，建立优化数学模型，并运用约束变尺度法优化斜导柱尺寸参数。为模具斜导柱抽芯机构设计提供了合理、快捷的设计方法。     

基于SolidWorks的制酸工程非标设备参数化设计

为了提高制酸工程非标设备设计工作的效率，提出了一种设备的参数化设计方法。以制酸系统转化工序中一种特定结构的预转化器为研究对象，系统介绍了利用Solid Works软件及其外接程序Drive Works进行三维建模、模型尺寸管理、二维工程图模板建立、二维工程图的生成及原始模型参数化等内容，并验证了参数化设计的有效性，为参数化设计技术在制酸工程设计领域的应用和发展提供启示。     

基于Plant Simulation仿真在涂装工艺规划应用分析

通过P lant Simulation软件仿真模拟，对车间整体布局及工艺参数进行了虚拟验证，在规划阶段提前预判了产能瓶颈及设计冗余，有效规避了设备投产后的运行风险。通过建立仿真试验，对比不同工艺参数、不同产线配置的仿真结果，进行相应设计优化，降低了设备投资费用及运行能耗。     

可控制纤维取向的长玻纤增强塑料管材挤出机头

介绍笔者发明的两个关于长玻纤在线挤出增强管材机头的专利,描述了这两个机头的结构特点和工作原理,其特征为,机头可安装在现有通用的挤出机上,使用普通的聚合物粒料,在粒料塑化熔融后在线混入一定长度的玻纤,能使熔体分子和玻纤沿所挤出圆形管材的管壁螺旋取向。     

超高摩尔质量聚乙烯管件的制备及应用

提出并完成一种投资小、设备简单，适合于多品种、小批量生产超高摩尔质量聚乙烯(UHMWPE)管件的方法。该方法通过在UHMWPE管材生产线上添加一套辅助装置，可制备任意角度和一定级差变化的UHMWPE弯头。以UHMWPE管材为原料，在特殊设计的设备上，将支管和直管沿交接线熔接在一起，可制得各种规格的UHMWPE三通。提出了UHMWPE管件应用中的注意事项。     

Practical interpretation of laboratory die swell behavior of PVC extrudates—through correlating circular with non-circular die performance

Laboratory die swell measurements are routinely measured on many viscoelastic polymer extrudates to characterize thier ability to maintain a specified shape during extrusion operations. The diameters of downstream extrudates obtainable through selected round dies can then be routinely scanned by optical or laser type devices to compare the degree of swell relative to the die diameter itself. Such measurements, while yielding good relative die swell performance between compounds, frequently do not predict the actual die swell levels observed later when the same compound is extruded through production dies of different cross-sectional shapes and land lengths. This study discusses an alternate method of correlating die swell between dies of different shapes by using a technique derived from fluid mechanics. This concept, used to characterize fluid velocity through non-circular channels with that observed through circular pipes and ducts, involves the inclusion of a shape factors known as the “Hydraulic Radius” in fluid flow comparisons. When this technique was applied to die swell measurements for extrudates of both a flexible PVC wire jacket compound and a rigid PVC pipe compound, good agreement in actual die swell measurements through both round dies and dies with non-circular cross sections was obtained. This approach can lend credibility to laboratory die swell measurements and greatly expand their use in predicting production extrusion performance.     

Flow induced fiber orientation in an expanding channel tubing dies

In the application of plastic pipes for fluid transport and for the protection of underground electrical cables, it is desirable to improve mechanical properties, particularly in the hoop direction. The use of orientable reinforcing particles such as chopped glass fibers could make possible such an improvement if the orientation of the fibers could be controlled. While conventional pipe extrusion dies tend to promote axial fiber orientation, the use of an expanding channel die has been proposed to produce a preferential hoop orientation of fibers. In this paper, a theoretical model of the flow of a fiber suspension through an expanding channel die that predicts the fiber orientation distribution at the die exit is described. The effects of Theological properties and die geometry on the final fiber orientation distribution are predicted. The results of an experimental study of fiber orientation in pipe extruded using an expanding channel die are shown to be in agreement with the theoretical predictions.     

A coextrusion process for the manufacture of short-fiber-reinforced thermoplastic pipe

The advantageous use of short-fiber-reinforced thermoplastic (SFRTP) resins in the manufacture of pipe requires that the fiber orientation be controlled and that the surface finish not be adversely affected by the presence of the fibers. It is proposed here that a coextrusion process be combined with the use of a Specially designed, expanding channel die to achieve these objectives. Conventional pipe dies tend to promote the axial orientation of fibers, which has an undesirable effect on the hoop properties of pipe. The use of an expanding channel die promotes fiber orientation in the hoop direction. However, even in this case, there is still a strong component of the shear field near the wall of the die, and in this region, axial orientation still predominates, The use of a three-layer, coextrusion process in which unreinforced resin is used for both the inner and outer layers makes it possible to minimize the shear effects on the fiber orientation in the middle SFRTP layer. At the same time, it provides a smooth, fiber-free pipe surface. A theoretical analysis of this process is presented. The analysis shows that the presence of unreinforced surface layers increases the level and uniformity of fiber orientation. The results of an experimental study of fiber orientation in the middle SFRTP layer are found to be in qualitative agreement with the predictions of the theory.     

Orientation of LCP blown film with rotating dies

Liquid crystal polymers (LCPs) have been commercially available for over 10 years, but their use has been limited almost entirely to injection molded parts, totaling only about 7.5 million kg per year. Much larger volume uses of LCP in film, tube, pipe and extruded parts have not been exploited because of uncontrolled orientation in LCP. This paper explains how shear and elongation forces, controlled by rotating extrusion dies, orient LCP film, tube and other extruded parts. Applications to electronic, medical and high barrier packaging markets are discussed.     

Effect of filler content and additives on the extrudate swell of polyethylene pipe resin

In certain extrusion operations, particularly the production of plastic pressure pipe, it would be desirable to be able to control the degree and direction of molecular orientation. While dies can be designed to generate various types of orientation, most of this is lost at the die exit due to extrudate swell. It is known that substantial loadings of nonreinforcing filler can inhibit swell, and the objective of this study was to examine the effects of particle size and loading and of the use of coupling agents on extrudatee swell of CaCO₃-filled medium-density polyethylene pipe resin. Swell was measured as a function of time by extruding into oil having the same density and temperature as the extrudate. In addition, the storage and loss moduli of all samples were measured, and, the relaxation spectra were calculated. The maximum degree of swell suppression was observed for a compound containing 30 wt. percent of 0.4 micron particles treated with stearic acid. Surprisingly, the use of coupling agent increased the degree of swell.     

多层共挤出塑料薄膜机头的结构改进与发展

介绍了多层共挤出薄膜机头--多层共挤出流延薄膜机头（平膜法）和多层共挤出吹塑薄膜机头（管膜法）的结构、优缺点及其最近10年来的发展状况。在平膜法机头中主要介绍了多流道式机头和喂料块式机头及供料块与多流道组合式狭缝式机头;管膜法机头中主要介绍了套管式圆柱体多层共挤出机头和叠加型圆柱体多层共挤出机头。多层共挤出薄膜机头的发展主要体现在共挤出机头结构上的不断创新以及物料的适应性不断增强和薄膜层数的不断增加等方面。     

预应力结构模具设计理论的研究

本文综述了预应力模具的发展现状、现有的预应力模具种类和存在的问题：预应力环模具不能很好的适应冷挤压、冷锻、金刚石合成等工作环境;预应力缠绕模具是一种新型的预应力结构模具的设计理论,其设计理论在中国相对不是很成熟。针对预应力模具开展研究具有重要的实际意义和科学价值。     

塑料异型材挤出模头稳定性设计的数值方法

根据挤出模头设计的最小横向流动理论，运用ANSYS有限元分析软件，模拟分析了两副模头分流段流道的三维非牛顿流场，讨论了分流段流道设计对模头稳定挤出的影响；指出分流段流道设计满足流动平衡条件时，流道横向流动最小，模头的稳定性能较好；并通过两副实际使用的挤出模具，验证了理论分析与实际的一致性，从而给出了塑料异型材挤出模头稳定性设计的数值方法。