注塑成型：自动化与集成博得喝彩

不同寻常的集成 恩格尔和克劳斯玛菲两家公司分别采用其精细集成单元中的2台设备来制备有机混合型复合材料。设备主要用于编织玻纤／尼龙复合片材的预热、成型和包覆注塑。克劳斯玛菲还在其IMC注塑混配机中混配了长玻纤包覆成型配混料。其中，在恩格尔的案例中，最终产品在模具外被激光修整。     

玻璃纤维套管外层用加成型有机硅涂料通过省级鉴定

佛山市华联有机硅有限公司独自研发生产的玻纤套管外层用加成型有机硅涂料于 2 0 0 3年 6月2 5日通过广东省经贸委组织的鉴定。该产品采用无卤阻燃新技术 ,具有良好的自熄性 ,对玻璃纤维粘接性良好 ,耐高温性、电绝缘性和耐老化性良好 ,受到用户好评玻璃纤维套管外层用加成型有机硅涂料通过省级鉴定     

多墙结构副翼RTM整体成型工艺研究

采用树脂转移模塑成型(RTM)工艺，研究多墙结构副翼低成本整体成型的可行性。采用数值模拟技术对多墙结构副翼的树脂流动过程进行了模拟计算，根据模拟结果选择合理的注射方式和工艺参数，同时采用碳纤维编织套管成型副翼墙，以进一步降低制造成本。对所选方案进行了工艺试验验证，并对结构件进行了质量检测。结果表明：碳纤维编织套管的应用大大提高了预制体的制备效率，节省人工约60%；理论充模时间和试验充模时间基本一致；结构件表观质量良好，厚度分布均匀，内部无缺陷，验证了所选模拟方案合理有效，整体成型方案切实可行。研究结果为低成本制造高性能复合材料多墙结构件提供了参考。     

探究缝编工艺参数对玻纤复合材料性能的影响

通过设计并制备6种不同编织工艺参数的单轴向玻纤经编织物,探究涤纶丝缝编针距、缝编线粗细旦数、缝编线针脚长度以及缝编方式和纬线的交叉与平行铺纬方式对玻纤复合材料的厚度、纤维质量分数和静态力学性能的影响。研究结果表明：不同编织工艺参数对玻纤复合材料的厚度与纤维质量分数的影响主要取决于单轴向玻纤经编织物中涤纶丝体积分数高低,涤纶丝体积分数高者其玻纤复合材料厚度偏厚,反之偏小,但是对玻纤复合材料静态力学性能影响微乎其微。     

玻纤增强PP挤出吹塑成型性能研究

通过熔体流动速率测试及转距流变实验,分析确定了不同含量玻纤增强聚丙烯(PP)的挤出吹塑成型加工性能及加工工艺。得出了不同含量玻纤增强PP挤出吹塑制件的最小壁厚的参考值。通过玻纤在挤出吹塑成型过程中的流动取向及对制件断面形貌的观察表明,玻纤增强PP的挤出吹塑成型工艺是可行性的。     

聚氨酯S-RIM研究

考察了长纤维玻纤垫的品种规格及用量对聚氨酯S-RIM性能及工艺的影响,确定了聚氨酯S-RIM工艺中玻纤垫的预成型方法及制品成型工艺条件。     

连续玻纤增强PET复合材料成型工艺条件的探讨

本文通过对在不同成型工艺条件下制得的玻纤增强PET复合材料的性能研究,探讨了成型工艺条件对于连续玻纤增强PET复合材料性能的影响。     

立体编织预制体用自动单针插刺机设计

介绍了立体编织预制体成型工艺过程中,单针插刺工艺的自动化,提出了自动单针插刺机的总体设计方案,研究了方案的机构功能及工作过程。自动单针插刺机研制,可提高生产效率,优化成型工艺性能,适应立体编织预制体形状复杂化、大型化的趋势要求。     

三维编织复合材料的发展及应用研究

三维编织复合材料以其高比刚度、高比强度以及优良的抗冲击、抗分层性能被广泛应用于航空航天领域。随着编织工艺的不断革新以及固化成型技术的持续发展,三维编织复合材料在一体化成型和大尺寸自动化编织上展示出得天独厚的优势。本文对三维编织机进行分类,讨论了三维编织与二维编织的区别,介绍了三维编织预成型体工艺的发展现状,对三维编织复合材料的应用现状进行总结。最后,对三维编织复合材料的应用前景进行了展望。     

可与GMT媲美的PP复合材料

美国化学纺织品生产商Milliken公司研制出一种100％聚丙烯的复合材料，这种PP复合材料与玻纤毡片热塑性塑料制件(GMT)相比，具有相同的加工性能、机械特性、成本价格、可回收利用性能，可先加工编织制成毡片材料，再采用改进型热成型工艺进行模塑加工，其热成型温度设定在140-160℃之间，压力在1～2MPa左右。     

基于SolidWorks的钢丝编织机主传动系统分析

摘要：钢丝编织是生产钢丝编织胶管的一道重要工序,直接关乎胶管的耐压性能。钢丝编织机的运动直接影响编织质量,主传动系统的分析是对其进行优化改进的前提。为了提高钢丝编织机主传动系统的设计效率,充分利用了虚拟仿真,搭建钢丝编织机主传动系统的的虚拟仿真系统,基于SolidWorks 工作平台,建立钢丝编织机主传动系统的三维模型,通过Motion进行运动仿真,获取齿轮的转速曲线,通过Simulation进行有限元分析,形成一套完整的分析体系,更加简明、直观的分析出钢丝编织机的运动特性,更具有通用性。     

三维编织工艺及机械的研究现状与趋势

详细介绍了三维编织工艺和三维编织机械的发展历史与现状,分析对比了三维编织工艺流程及三维编织机的结构特点和适用性,总结了三维编织技术研究的热点和亟待解决的问题,为三维编织机的设计研究提供了一定参考。     

钢丝编织机噪声问题及其消音罩的设计

本文主要就用于生产高压钢丝编织胶管的设备——钢丝编织机,在运行中产生的噪声原因及治理方案进行论述,并具体介绍了消音罩的设计。     

三维编织预制件单胞模型的参数化

应用Pro/E的3D实体建模功能建立了三维整体编织预制件的单胞模型,包括内部单胞、表面单胞和棱角单胞。模型中真实反映了纤维尺寸和纱线走向。基于编织工艺参数间的关系,在Pro/E中实现了参数化设计,不同编织角下的各种单胞模型可自动生成。作为三维编织预制件中的周期排列微观结构,参数化单胞的建立为进一步研究三维整体编织复合材料的性能提供了便于应用的理论分析模型。     

二维编织复合材料管件轴向压缩性能研究

通过优化二维编织复合材料管件复合工艺,制作了碳纤维含量较高的碳纤维复合材料管件,同时对管件进行了轴向压缩性能测试,分析并探讨了编织参数对复合材料管件纤维体积含量及轴向压缩性能的影响。结果表明:优化后的复合工艺可保持复合材料管件纤维体积含量在20%~40%之间,同时使得复合后管件的内径达到一致;在编织速度不变的情况下,随着编织节距的减小,编织角逐渐增加,纤维体积含量逐渐增加,当编织节距减小到一定程度后,纤维体积含量的增加变缓,而轴向压缩强度先升高后降低,当达到最大值时,编织角为46°。     

Compressive damage in two-step braided thermoplastic composites

This work examines compression-induced damage in a 3D, braided carbon/nylon 6 composite. The two-step braiding was used to form the fabric, and the yarn used was a carbon tow commingled with nylon 6 powder. About 82% of overall fibers were arranged along the axial direction, and the rest were the braiding fibers. A matched mold was designed for melting the resin and pressing the fabric into a predetermined thickness for the resulting composite. The molding temperature was varied to examine its influence on the compressive properties. The compressive tests were carried out by using an end-supported, end-loaded fixture designed for thicker specimens. The results showed that the molding temperature greatly affected the composite modulus and strength. Microscopic observations revealed that the induced damage modes differ from those in 3D thermosetting composites. Miniscopic failure of the yarns appears to be the dominant mode. Two types of damage were observed. One is miniscopic kink-band caused by the through-thickness shear stress; the other is the folding of the axial yarns into a corrugation form. These modes are related to the 3D structure and the interfacial bonding condition. Some key features of the capability of energy absorption of this material are also discussed.     

Design strategy of poly (L-lactic acid) mixed braided stent: The influence of braiding ratio of thick and thin monofilaments

For the design of polymer stents, supportability and flexibility are two important indexes, but they are often difficult to balance. The mixed braiding of monofilaments with different diameters provides a potential solution to balance these two indices. In this study, the influence of mixed braiding on the mechanical properties of the stent was further explored by adjusting the knitting ratio of thick and thin monofilaments. By replacing the monofilaments in the stent with monofilaments with smaller diameters in turn, the changing trend of supportability and flexibility is obtained. The results show that, when the number of thick monofilaments is greater than or equal to that of thin monofilaments, the supportability of the stent can not only be maintained but also the flexibility can be greatly improved. Therefore, mixed braiding has the function of adjusting supportability and flexibility.     

任意矩形组合截面二步法三维编织的纱线布置规律及其计算机辅助设计

本文研究了任意矩形组合截面二步法三维编织的纱线布置规律。并利用软件使二步法三维编织的工艺设计安全由计算机实现，为二步法三维编织的安全自动化奠定了软件基础。     

芳纶编织绳与加捻绳的拉伸曲线比较分析

用芳纶纤维制备了编织绳和加捻绳,测试拉伸性能,对拉伸曲线进行分析。结果表明,编织绳和加捻绳的载荷-位移曲线明显不同,前者在断裂前出现小锯齿状,后者在断裂后出现大锯齿状,二者断裂之前的载荷-位移曲线之间有很大的空白地带,表明编织绳的拉伸初始模量远远高于加捻绳。     

Mechanical behaviors of four‐step 1 × 1 braided carbon/epoxy three‐dimensional composite tubes under axial compression loading

This article focuses on the quasistatic axial compression behavior and the consequent energy absorption of three different types of carbon/epoxy braided composite tubes. The focus is to evaluate the effect of sample length and braiding angle on the energy absorption and failure mechanism of the braided composite tubes. All tubes were manufactured with carbon fiber through four‐step 1 × 1 braiding process and epoxy resin. Quasistatic axial compression tests were carried out to comprehend the failure mechanism and the corresponding compressive load–displacement characteristics of each braided composite tube. The quasistatic compression test parameters such as the compression peak load and the energy absorption of all these composite tubes were compared. It was found that as the length of the sample increased, the peak load reduced and the energy absorption of the braided tubes at 45° braiding angle was considerably higher than that of other braiding angles of 25° and 35°. The failure modes included matrix crack along the braiding angle, fiber breakage, bulging and debonding between yarns. POLYM. COMPOS., 37:3210–3218, 2016. © 2015 Society of Plastics Engineers