前处理及电泳阶段轿车排液结构分析

涂装工艺分析可以消除或者降低车身结构缺陷引起的涂层质量问题。从排液性方面对影响车身涂装前处理及电泳质量的结构进行了分析,重点对四门两盖结构及车身底部总成结构中常见的积液问题进行了案例说明并提出相应优化措施。     

轿车电泳二次流痕缺陷分析与对策

对电泳涂膜电泳二次流痕缺陷的形成原因进行了描述和分析,探讨了导致电泳涂膜缺陷形成的机理。主要从涂装工艺、冲焊工艺以及车身产品结构等多方面对电泳二次流挂缺陷进行探讨和分析,并提供了一些预防及解决方法。     

浅谈车身排气结构设计方法

针对车身凸筋、钣金空腔等在电泳时可能存在气室的凸起结构,介绍了设计阶段可以采取的优化方法,并对使用条件及优缺点进行了分析。     

电泳气泡缺陷探究

为解决汽车车身在翻转电泳线电泳生产中的气泡缺陷，分析了电泳气泡的成因，研究了喷淋、车身行进曲线、助剂、施工条件对气泡的影响。结果表明：气泡缺陷是由电泳初始段气体无法及时排出，附着在电泳湿膜表面从而影响成膜导致的；气体来源是车身内腔原本存在的空气以及电泳反应过程中释放的氢气。喷淋配合车身行进曲线加强排气对解决气泡问题起到重要作用；其次通过添加助剂来增加漆膜疏水性，能够降低气泡缺陷数量；提升电泳温度、排除小分子超滤液等辅助措施最终解决气泡问题。     

车身电泳不能成膜的原因分析

车身电泳漆膜质量直接影响汽车的防腐效果和外观。采用化学方法、扫面电镜微观分析和能谱成分分析理化检测方法,对车身冲压件局部电泳不能正常成膜的原因进行了分析,研究表明:产生缺陷的钢板表面含硅氧,阻止了磷化膜的形成,不利于表面涂装,导致电泳无法正常成膜。此次缺陷分析,为汽车厂和冲压件生产厂找到了一种方便快捷的钢板表质量控制方法,从而降低车身电泳缺陷。     

某车型车身A柱电泳结构的优化

简要介绍了涂装同步工程在新车型开发各阶段的主要工作内容,详细论述了车身空腔钣金之间的间隙、孔径、孔距及对穿孔等对空腔电泳性的影响。针对某车型工程样车E D车身拆解暴露的A柱空腔局部电泳膜厚偏薄的问题,根据各钣金件的结构特点、搭接方式及钣金间形成的空腔大小等,对其结构进行了优化,并应用ECoatMaster对优化后的车身数据进行仿真计算和ED车身的拆车验证,提升了车身的电泳涂层质量,满足整车防腐的设计要求。     

商用车新产品涂装工艺同步分析

介绍了商用车新产品开发过程中涂装工艺同步分析的主要内容,包括电泳屏蔽性分析、沥水性分析、排气性分析等,以及样车验证阶段车身拆解验证的主要步骤.     

新产品涂装滑橇共用性分析

介绍了涂装滑橇的基本结构及定位方式;讨论了不同白车身尺寸的新产品在现有线体滑橇上的共用可能性。重点对新产品的定位孔形式、前后定位孔高度差对滑橇共用性的影响以及多个产品滑橇共用性进行了推理分析和计算,对降低主机厂生产成本、加速新产品投放市场有着十分重要的现实意义。     

SUV车型后盖尾灯处电泳流淌问题分析及解决

电泳流淌是涂装车间常见缺陷，在车门、前后盖区域发生较多。电泳流淌产生与车身结构、电泳过程直接相关，在电泳后的烘干过程产生。本文以SUV车型后盖尾灯处流淌为例，分析其产生的原因及解决办法，为解决流淌问题提供思路。     

浅谈电泳二次流痕缺陷的控制

阴极电泳已广泛应用于汽车涂装,电泳二次流痕(俗称电泳水)是阴极电泳过程中的常见缺陷。结合车身调整、电泳滴水挡板设计、电泳吹气3种措施改善电泳二次流痕缺陷的实际案例,介绍控制电泳二次流痕缺陷的方法。     

浅谈新车型开发过程中车身涂装防腐分析及方法

阐述了新车型开发过程中车身涂装防腐工作的开展,包括设计阶段的涂装同步工程分析、试制阶段的电泳车身拆解验证等方法和措施。对新车型开发过程中的不同阶段采取相对应的方法来提升车身的防腐能力,满足防腐要求。     

探秘新型结构陶瓷材料及其运用与发展

先进的结构陶瓷材料由于具有一系列优异的性能,在节约能源、节约贵重金属资源、促进环境保护、提高生产效率、延长机器设备寿命、保证高新技术和尖端技术的实现等方面都发挥了积极的作用,受到业内的广泛关注。根据先进的结构陶瓷在工业工程中的应用效益显著,分析了先进结构陶瓷的主要组成物、性能特点及其应用领域,研究了先进结构陶瓷材料的新产品开发,介绍了先进结构陶瓷材料在发动机上的运用实例,同时指出了先进结构陶瓷材料的发展前景及趋势。     

BUBBLE DYNAMICS AND ELUTRIATION STUDIES IN GAS-FLUID1ZED BEDS

In order to adequately interpret the heat and mass transfer data taken in a gas-fluidized bed, it is essential to know the bubble dynamics and solids movement in the bed, and solids elutriation from the bed. To generate information on these aspects, an experimental facility has been designed, fabricated and successfully tested. This consists of a two-dimensional fluidized bed with its gas supply and cleanup system. The bubble dynamics and solids projection from the bed are recorded by a high-speed movie camera. The films are analyzed on a photo-optical data analyser and digitizer provided with an electronic graphics calculator connected to tape printer and a Teletype terminal interfaced with a computer. The analysis of recorded bed dynamics suggests that for large particles the bubbles grow to be non-spherical and these rise almost above the bed surface before bursting when the wake remains intact while the solids bulge at the bubble nose ruptures to release the bubble gas. It is concluded unambiguously that the solids projected in the freeboard originate from the bubble bulge, and not from the bubble wake as commonly believed. A series of experiments is proposed which will facilitate the development of a general quantitative theory for solids elutriation from industrial fluidized beds.

In addition, a fairly complete review of the work done on bubble dynamics, solids movement in the bed, and solids projection from the bed surface in two- and three-dimensional fluidized beds is presented. Thus, on the whole the present work reviews the state-of-the-art of these three different fluid-bed aspects, and reports new data.     

BUBBLE DYNAMICS AND ELUTRIATION STUDIES IN GAS-FLUID1ZED BEDS

In order to adequately interpret the heat and mass transfer data taken in a gas-fluidized bed, it is essential to know the bubble dynamics and solids movement in the bed, and solids elutriation from the bed. To generate information on these aspects, an experimental facility has been designed, fabricated and successfully tested. This consists of a two-dimensional fluidized bed with its gas supply and cleanup system. The bubble dynamics and solids projection from the bed are recorded by a high-speed movie camera. The films are analyzed on a photo-optical data analyser and digitizer provided with an electronic graphics calculator connected to tape printer and a Teletype terminal interfaced with a computer. The analysis of recorded bed dynamics suggests that for large particles the bubbles grow to be non-spherical and these rise almost above the bed surface before bursting when the wake remains intact while the solids bulge at the bubble nose ruptures to release the bubble gas. It is concluded unambiguously that the solids projected in the freeboard originate from the bubble bulge, and not from the bubble wake as commonly believed. A series of experiments is proposed which will facilitate the development of a general quantitative theory for solids elutriation from industrial fluidized beds.

In addition, a fairly complete review of the work done on bubble dynamics, solids movement in the bed, and solids projection from the bed surface in two- and three-dimensional fluidized beds is presented. Thus, on the whole the present work reviews the state-of-the-art of these three different fluid-bed aspects, and reports new data.     

基于ANSYS ACP的复合材料潜水器结构设计

基于ANSYS Composite Prep/Post复合材料分析模块研究了潜水器在起吊工况下的结构强度。采用Hill-Tsai强度理论和Tsai-Wu强度理论,对比了两种不同失效准则下的潜水器结构失效形式。对潜水器不同结构区域处碳纤维编织材料的铺层数量进行参数化设置,结合试验设计方法,用合理有效的计算样本得到了复合材料潜水器载体结构的最优设计方案。文中采用的复合材料结构有限元计算与试验设计相结合的方法,对于复合材料工程结构的直接优化具有一定的参考价值。     

Single bubble eruptions in gas fluidized beds

The motion of the solids thrown above the bed surface by single bubble eruptions was studied using a high speed video system. Data on the motion of the bubble and emulsion phases are presented as functions of bubble size, type of bed material, fluidizing velocity and bed depth. When plotted in dimensionless form, the trajectories of the tops of the bulge layer, bubble and wake can be condensed into three universal curves which represent the trajectories for these points for the entire range of bed materials, bubble sizes, fluidization velocities and bed depths tested. There appeared to be no significant effect of excess air, bubble size or bed depth on the dimensionless heights reached by the wake and bulge materials. In all cases the bulge material was ejected to a greater height above the bed than the wake.     

薄形陶瓷板釉泡、孔洞影响因素探讨

薄形陶瓷板作为一种可持续发展陶瓷产品越来越受到人们的欢迎.但是,在生产薄形陶瓷板过程中,非常容易产生釉泡、孔洞等缺陷.笔者从各个工序探讨了产生釉泡、孔洞缺陷的影响因素.通过研究发现,产生这些缺陷的主要原因是因为坯体里的硫酸盐和碳酸盐在分解过程中排气不充分导致.最后结果表明:通过在坯体配方中降低高CaO含量的原材料比例原...     

泡沫玻璃气泡缺陷与解决方案

泡沫玻璃是一种具有均匀气泡结构的玻璃制品,具有隔热、吸声、防潮、防火等特点的轻质高强建筑材料和装饰材料。泡沫玻璃的生产过程中,经常会遇到气泡结构不均或大气泡等气泡缺陷。本文从气泡的产生机理分析入手,针对具体的气泡缺陷种类,分析产生原因,提出解决方案,更好地实现泡沫玻璃的内在和外观质量。     

工程机械行业结构件涂装线的设计

对国内大型工程机械业主要企业的结构件涂装线进行了调查研究,结果发现,传统涂装线存在投资大、产能低、能耗大、安全性和可靠性低以及有涂装缺陷等问题。借鉴汽车涂装线的生产方式,采用二涂一烘工艺、通过式线体、地链输送方式和风幕密闭保温等措施设计出新的结构件涂装生产线。生产实践证明,新涂装线克服了传统涂装线存在的缺陷,具有投资少、能耗小、产能大、可以柔性化生产的特点。     

配套轿车轮胎的性能测试

介绍配套轿车轮胎开发过程中,从轮胎单体性能到轮胎整车性能所需的测试项目、设备及方法等。耐久性能包括常规耐久性能、老化耐久性能、结构耐久性能和整车加速耐久性能,安全性能包括强度性能、脱圈阻力、实车脱圈阻力、保持性能、制动性能、横向抓着性能、高速稳定性和耐鼓包性能,动力学性能包括刚度特性、六分力、操纵稳定性以及噪声、振动和声振粗糙度,经济性包括滚动阻力性能和耐磨性能等。指出建立完备的测试系统是配套轮胎开发的基础。