棉Modal锦纶赛络纺包芯纱的纺制

探讨外包纤维为精梳棉、Modal,芯纱为锦纶长丝的赛络纺包芯纱的生产工艺.介绍了锦纶丝、澳洲棉和Modal纤维的性能特点及纺纱工艺流程,通过纺纱工艺试验,针对原料性能,各工序优化配置了纺纱工艺并采取了相应的技术措施.粗纱工序采用轻定量、低速度、重加压、大隔距、较小后区牵伸和较大粗纱捻系数的工艺,细纱工序减小后区牵伸倍数,放大后区罗拉中心距.实践表明,纺制的精梳棉Modal锦纶丝赛络纺包芯纱为低弹纱,成纱质量良好.在纺制锦纶丝包芯纱时,选用的外包纤维细长、长度整齐度高,可以改善成纱条干和包覆效果,保证成纱质量.     

摩擦纺包芯纱织物性能测试分析

对棉包涤纶长丝摩擦纱、棉包锦纶高弹丝摩擦纱、棉包锦纶全牵伸丝摩擦纱以及棉包粘胶长丝摩擦纱四种平纹织物的性能进行了试验研究 ,并将它们与纯棉环锭纱和纯棉摩擦纱的平纹织物的性能进行了比较分析。研究结果表明 ,棉包涤纶长丝摩擦纱织物和棉包锦纶高弹丝摩擦纱织物在服用、舒适等方面均优于环锭纱织物。这两种摩擦纺包芯纱织物作为服用织物具有良好的发展前景     

预分绞无浸压式上浆设备的设计及应用

探讨预分绞无浸压式上浆设备的工作原理及其应用效果。针对传统浸压式上浆方法存在的压浆力大、耗费浆料多、易破坏纱线结构、上浆率不匀、易产生分绞毛羽等缺陷,改变传统的浸压上浆方法,采用预分绞后再上浆的模式,利用浆液喷嘴循环喷淋对纱线进行上浆,应用红外线对纱线进行烘燥,开发出了无浸压上浆设备,并对长丝进行了上浆。认为该设备不破坏原纱的特性,浆液成膜性好,浆纱性能稳定,且避免了分绞劈纱产生的二次毛羽,烘燥效率高,节约能源,后续织机效率和织造质量较好。     

A real-time computer controller for a Robotic Filament Winding system

This paper presents an integrated real-time control system for a Robotic Filament Winding manufacturing cell. The architecture is based on a multiprocessor system employing four processor boards. The system incorporates a hierarchical control layout with the task specification at the highest level and the robot and winder set point tracking at the lowest. Eventual design goals include a PC front-end unit capable of winding path generation and testing prior to actual part production. Preliminary experimental results on cylindrical, elbow and T-shaped pipe-fittings are included.     

基于KBE的起重机卷筒组设计技术研究与应用

在知识工程的基础上,引入参数化设计思想,利用面向对象的开发工具Visual Basic,以SolidWorks2010为设计平台,以Access、SQL Server 2000为数据库管理软件,采用参数化设计技术、工程图自动调整技术,全息建模和布局草图装配技术,研究开发了基于KBE的起重机卷筒组三维参数化设计系统。分析了图纸调整中存在的一些问题,提出了基于SolidWorks+AutoCAD的集成开发模式,能够快速生成设计模型的工程图,达到提高设计效率的目的。该技术已成功应用于某重型机械厂的产品设计当中,并取得了理想的效果。     

Effect of filament temperature and deposition time on the formation of tungsten silicide with silane

The effect of filament temperature and deposition time on the formation of tungsten silicide upon exposure to the SiH₄ gas in a hot wire chemical vapor deposition process was studied using the techniques of cross-sectional scanning electron microscopy and Auger electron spectroscopy. At a relatively low temperature of 1500 °C, the decomposition of WSi₂ phase and the diffusion of Si towards the silicide/W interface produce a thick W₅Si₃ layer. The diffusional nature leads to a parabolic rate law for silicide growth. An exponential decrease of silicide thickness with temperature between 1600 and 2000 °C illustrates the dominance of Si evaporation at higher temperatures (T ≥ 1600 °C) over the silicide formation.     

Improving narrow bandgap a-SiGe:H alloys grown by hot-wire chemical vapor deposition

We have improved the electronic properties of narrow-bandgap (Tauc gap below 1.5 eV) amorphous-silicon germanium alloys (a-SiGe:H) grown by hot-wire chemical vapor deposition (HWCVD) by lowering the substrate temperature and deposition rate. Prior to this work, we were unable to grow a-SiGe:H alloys with bandgaps below 1.5 eV that had photo-to-dark conductivity ratios comparable with our plasma-enhanced CVD (PECVD) grown materials [B.P. Nelson et al., Mater. Res. Soc. Symp. 507 (1998) 447]. Decreasing the filament diameter from our standard configuration of 0.5 mm to 0.38 or 0.25 mm provides first big improvements in the photoresponse of these alloys. Lowering the substrate temperature from our previous optimal temperatures (T_sub starting at 435 °C) to at 250 °C provides additional photo-to-dark conductivity ratio increasing by two orders of magnitude for growth conditions containing 20–30% GeH₄ in the gas phase (relative to the total GeH₄+SiH₄ flow).     

高炉料车卷扬电力拖动方案原理的分析和比较

本文面向炼铁高炉主卷扬电力拖动方案，通俗简介了各种电机电气传动方式和它们的特点，重点分析了绕线电机串阻调速，直流电机调速和交流电机通用变频调速的适用性和优缺点，特别指出了变频调速的节能优势及应用中存在和应注意的问题。     

Multiscale analysis of the influence of the triplet helicoidal geometry on the strain state of a Nb3Sn based strand for ITER coils

A theoretical model of a beam of unidirectional composites—based on the homogenisation theory and a refined kinematical hypothesis—is used for the analysis of the influence of the helicoidal geometry of a superconducting strand triplet on its strain state. The triplet is the first cabling stage of the superconducting cables used to wind the coils of ITER fusion reactor. The multiscale modelling strategy is presented, for which a finite element code has been developed. A triplet of Nb₃Sn based strands subjected to an axial stretch is analysed, and the resulting complete 3D strain state in the Nb₃Sn filament is recovered. An “extra” strain is found due to the helicoidal geometry of the triplet. Discussion of the results concludes the paper.     

先进热塑性树脂基复合材料预浸料的制备及纤维缠绕成型技术

本文简要总结了国内外高性能热塑性树脂的基本性能与开发应用现状.详细论述了预浸渍(反应链增长浸渍工艺、熔融浸渍工艺和溶液浸渍法)和后浸渍(纤维混合法、粉末混合工艺、Fit工艺和薄膜叠层法等)两大类热塑性复合材料预浸料的制备方法,着重介绍了应用较少的溶液浸渍法,并分析了各种制备方法的优缺点.对比分析了热塑性复合材料缠绕成型三条工艺路线(预浸带缠绕/原位固结工艺,预浸带缠绕/后固结工艺和在线浸渍缠绕/原位固结工艺)各自的特点与优势.最后介绍了本课题组采用在线溶液浸渍缠绕/原位固结成型工艺制备连续纤维增强新型可溶性聚芳醚砜酮(PPESK)树脂基复合材料(套筒部件和NOL环)方面所取得的研究进展.