浅谈汽车焊装螺柱焊防错知识的应用

笔者结合多年汽车焊装生产现场工作经验,收集焊装生产过程中螺柱焊使用防错技术以及防错相关技术材料,浅谈焊装车间生产螺柱焊防错知识的应用。本文以奇瑞汽车股份有限公司风云2车型焊装生产车间为例,阐述焊装车间生产过程中螺柱焊防错技术的应用,提高焊装车间螺柱焊的准确率,减少焊装车间质量问题的发生。     

汽车焊装生产过程中冲压件防错问题

围绕焊装车间混线生产的车型,由于相似结构的冲压件差异性较小,导致左右件装反或者两款车型制件焊接错误的问题进行探究,从设计、冲压、焊装等多方面进行考虑,以达到防错降低报废率的目的。     

射频识别技术在钢管制造中的应用

介绍钢管管号识别方式,分析射频识别技术在钢管制作流程中的应用。分析认为:利用射频识别技术自动读取钢管管号,可以解决MES人工输入存在的输入错误、滞后等问题;射频识别设备具有远距离快速识别标签的特点,应用在钢管生产流程中可以最大限度地提高生产效率和准确性。射频识别技术应用近5年来,虽存在重复发卡、数据读取错误等问题,但通过技术和工艺调整,目前使用效果良好。     

基于网络通信和RFID技术集成的数控原型系统研究

设计了基于网络通信技术和射频识别(RFID)技术的数控系统.通过Socket套接字实现各射频读写系统之间的信息通信,网络通信实现各射频终端的信息共享;通过Boost库中的Regex类实现正则表达式对NC代码的分析和控制信息提取.定义了射频标签中的数据,从而实现系统通过标签自动调用NC代码文件进行加工控制以及远程控制各射频终端读写系统.     

射频识别技术在定制化产品柔性制造系统中的设计与应用

基于射频识别技术(Radio Frequency Identification,RFID),提出了一种定制化柔性制造系统的系统架构和设计方案。通过把定制化生产信息写入RFID标签,并借助生产线RFID模块和PLC通信的方式,利用Win CC平台,实现了柔性生产数据在RFID和生产信息系统之间的信息交互。重点对柔性生产线的RFID模块以及它的柔性信息交互进行了设计,并应用于实际系统中,实现了定制化产品在生产线上的柔性生产,具有一定研究意义和应用价值。     

基于RFID的农机WIP跟踪管理系统研究与实现

针对农机制造企业在制品(Work-in-process,WIP)生产过程信息采集时效性差,车间生产计划执行情况无法及时跟踪反馈的问题,在对农机车间生产现状研究分析后,提出了农机在制品生产过程实时信息跟踪反馈策略,通过无线射频识别(Radio Frequency Identification,RFID)车间信息采集方案、可重构BOM结构及在制品物流信息采集模型,实现了农机车间生产计划分解,WIP实时状态跟踪、生产进度查询等功能。研究内容为生产管理部门进行实时生产计划重排,为物资供应中心计算物料需求计划提供了准确的实时反馈数据,最后进行了软件系统的开发,并在某农机企业得到良好的应用。     

柔性化高速输送系统在焊装生产的应用

介绍了柔性化高速输送系统在焊装工艺生产线进行多车型切换生产的应用.柔性化高速切换输送系统包含高速滚床输送和齿轮齿条移行系统,原理是利用滚床台车设备的高低不同的输送面和齿轮齿条直线输送实现输送夹具台车x-y方向的高速转移切换柔性化生产.该输送系统可以按照工艺要求实现汽车焊接领域二级总成发仓、前后底板输送过程中多种车型混线柔性化生产,也可以推广到其他领域物流输送中.     

汽车焊装夹具智能化设计系统研究

汽车焊装夹具是车身结构件焊装中的专用夹具,其设计开发速度和制造质量直接影响汽车的上市速度和制造精度.针对传统汽车焊装夹具开发周期长这一现实,文章将专家系统和参数化设计技术引入到汽车焊装夹具设计中,讨论了汽车焊装夹具智能化设计系统的结构框架、原理、实现过程,并以汽车后纵梁某焊装工位为例,介绍了焊装夹具的生成过程.实践表明,应用该系统进行汽车焊装夹具设计,可显著缩短开发周期,对新车型上市速度的提高起到积极推动作用.     

D530焊装线的柔性化改造

通过对白车身驾驶室焊装线的在线改造总结,阐述了一种新型的多品种车型焊装线夹具柔性化在线改造技术的开发与应用,为以后的驾驶室焊装线混流改造提供了新的思路和参考.针对两种车型驾驶室差异较大难混流和在焊装线混流改造中精度比较难以控制的问题,对夹具采用多层次底板+直线导轨平移机构和伺服电机驱动+气动平衡助力系统予以解决,为焊装线在线改造提供了有效的解决方案.项目实施后通过一年多的批量生产考验,效果良好,同时取得了较高的经济效益和社会效益.     

基于RFID的信息集成柔性制造系统设计研究

设计基于射频识别(RFID)技术信息集成的小型柔性加工制造系统.通过射频识别技术容易实现各控制子系统的信息集成和交换.将各子系统中所需的关键信息写入射频标签中,射频读写器扫描读取工件上附着的标签.上位机对信息进行处理之后,实时地把控制信息送达各控制子系统.各控制系统的状态信息也可及时反馈到上位机,由上位机把信息写入到标签中,以更新标签中的内容.数控机床的加工代码全部按不同的文件名形式存入代码库中,上位机通过射频读写器读取不同工件上的标签中的信息来决定调用相应的加工代码文件,控制机床加工工件.因此当工件改变时,并不需要对生产线做大范围的调整,实现一定程度上的柔性制造.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.     

Effect of Short-Time Aging on the Pitting Corrosion Behavior of a Novel Lean Duplex Stainless Steel 2002

The effect of short-time aging in the temperature range between 400 and 1000 °C on the pitting corrosion behavior and mechanical property of a novel lean duplex stainless steel(LDSS) 2002 was investigated through the potentiostatic critical pitting temperature(CPT) tests and the Charpy impact tests. Both the pitting corrosion resistance and the toughness of aged specimens degraded due to the precipitation of detrimental secondary phases and the most significant reduction of CPT and impact energy emerged at 650 °C concurrently. The CPT of LDSS 2002 specimen aged at 650 °C decreased by 28 °C, and the impact energy dropped from 69 to 29 J/cm~2 compared with the solution-annealed sample. Transmission electron microscopy characterization showed that the main precipitates in LDSS 2002 were Cr_2N and M_(23)C_6 along the ferrite–austenite grain boundaries.     

INTRODUCTION TO PATENTS

The invention provides a method of making a mold which can reduce SOx generation rate while preventing decrease in hardening rate in the case of using sulfuric acid for a hardener composition. The method has a mixture step in which fire-resistant particles, a hardener composition and a binder composition are mixed to obtain a composition for a mold. The hardener composition contains sulfuric acid. In the mixture step, sodium carbonate is added. A molar ratio of the sulfuric acid to the sodium carbonate is 0.5 or more and 4.0 or less.     

China Foundry Week 2014

China Foundry Week, hosted by the Foundry Institution of Chinese Mechanical Engineering Society （FICMES） each year, is a large academic event in China. It is one of the ten high-impact activities sponsored by the Chinese Mechanical Engineering Society.     

17th Conference of Hydrodynamic and Electromechanical Control Engineering Call for papers

正1.Contents In order to promote the academic exchanges and technical communication of the research in the field of fluid power transmission and control,fluid control engineering specialized committee of the Chinese Society of Theoretical and Applied Mechanics will hold the 17th Conference of Hydrodynamic and Electromechanical Control Engineering on July 27-29,2014 in Tibet,Lhasa city.     

Information for Contributors

正The Transactions of Nonferrous Metals Society of China,founded in 1991 and sponsored by The Nonferrous Metals Society of China,is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology,including mineral processing,extraction metallurgy,metallic materials and heat treatments,metal working,physical metallurgy,powder metallurgy,with the emphasis     

Preface

<正>We are pleased to present this Special Issue of Transactions of Nonferrous Metals Society of China containing selected papers from the First Asian Conference on Aluminum Alloys(ACAA-2013),held in Beijing,China,13–17 October 2013.This conference has been initiated,with approval of     

Information for Contributors

The Transactions of Nonferrous Metals Society of China, founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, 1NSPEC, CA, METADEX, AJ and JICST.     

Formulas of Tension of Continuous Rolling Process

The development of computer controlled continuous rolling process calls for a mathematical expression that can express the inequality condition of "constant flow". Tension is the link of the continuous rolling process. From the condition of dynamic equilibrium, a differential equation of tension is given out. On the basis of the physical rules established from the industrial practice and experimental studies, the law of volume constancy, the linear relation of forward slip and tension, the state equation of continuous rolling, the formula of dynamic tension, and the formula of static tension have been obtained. These formulae reflect the functional relations between tensions, thickness, roll velocity, and time in the continuous rolling process. It is implied that the continuous rolling process is a gradually steady, controllable, and measurable dynamic system. An assumption of predicting the thickness of a steel plate using these tension formulae is also put forward.