热轧卷板边部直裂纹的成因分析及控制

热轧卷板上出现的不同于常规发纹的短直形边部直裂纹缺陷对产品的影响较大。轧钢环节的中间坯显示铸坯切角部位出现规则性斜向裂纹,通过使用电镜、金相、酸洗等检测方法对卷板、中间坯、连铸坯进行检测,分析裂纹形成机理,认为：铸坯三角区的多种缺陷在铸坯大切角量情况下被轧制放大是造成卷板边部直裂纹缺陷的主要原因。通过调整成分、优化保护渣、调整结晶器水量、优化二冷边部水量、调整设备精度等措施改善了铸坯三角区质量、优化了切边量,最终消除了热轧卷板边部直裂纹的产生。     

AGC厚度控制系统及其在1250热卷板生产线的应用

分析了轧辊的弹跳现象和辊缝调节模型,介绍了AGC厚度控制系统中的厚度锁定方法、硬度前馈AGC、X射线测厚仪监控AGC、尾部补偿、活套补偿、自动复位等控制方法。河北敬业集团1250热轧卷板生产线采用AGC厚度控制系统,带钢厚度偏差控制在0.05～0.10 mm,满足了客户需求。     

唐钢涂镀产品的开发

介绍了唐钢冷轧薄板厂涂镀生产线的主要装备、工艺特点以及近两年的技术改造项目。重点介绍了涂镀产品的开发进展情况和在品种开发过程中遇到的技术难点及攻关情况。对下一步涂镀产品的开发方向进行了展望。     

热镀锌带钢表面亮点缺陷成因分析

应用金相显微镜、扫描电镜及能谱仪对镀锌板表面亮点缺陷和对应基板位置的宏观、微观形貌以及缺陷区域化学成分进行分析,发现:亮点区域凹于周围表面,化学成分不存在异常;去除表面锌层后,亮点缺陷对应的基板处存在缺陷,缺陷区域存在凸起,大小与镀层表面亮点缺陷一致,化学成分无异常。因而认为镀锌层表面缺陷是由于基板本身存在缺陷而产生的。     

多机通信在复合钢板生产过程中的应用研究

为提高减振复合钢板的生产质量、精度。采用PC机与单片机主从式多机通信方法。设计了以单片机分别对复合钢板生产过程中所需树脂材料温度、钢板卷曲速度及钢板厚度信息进行采集并传送至PC机。通过PC机进行信息处理并向单片机发送控制命令的系统。从而使复合钢板生产的过程中树脂材料温度控制在所需范围,复合钢板厚度达到精度要求。通过理论分析。验证了该方法的有效性。     

注塑模具自动控制系统的改造与设计

对工程塑料模具的控剜系统的工作流程进行了详细分析,设计了控制系统的总体结构,对系统的主要组成部分完成的功能作了介绍,对核心设计技术进行了论证,给出了系统开发的平台及依据,并阐述了系统的核心数据库设计方案,给出了主要数据表格式.     

Polymer/carbon based composites as electromagnetic interference (EMI) shielding materials

The extensive development of electronic systems and telecommunications has lead to major concerns regarding electromagnetic pollution. Motivated by environmental questions and by a wide variety of applications, the quest for materials with high efficiency to mitigate electromagnetic interferences (EMI) pollution has become a mainstream field of research. This paper reviews the state-of-the-art research in the design and characterization of polymer/carbon based composites as EMI shielding materials. After a brief introduction, in Section 1, the electromagnetic theory will be briefly discussed in Section 2 setting the foundations of the strategies to be employed to design efficient EMI shielding materials. These materials will be classified in the next section by the type of carbon fillers, involving carbon black, carbon fiber, carbon nanotubes and graphene. The importance of the dispersion method into the polymer matrix (melt-blending, solution processing, etc.) on the final material properties will be discussed. The combination of carbon fillers with other constituents such as metallic nanoparticles or conductive polymers will be the topic of Section 4. The final section will address advanced complex architectures that are currently studied to improve the performances of EMI materials and, in some cases, to impart additional properties such as thermal management and mechanical resistance. In all these studies, we will discuss the efficiency of the composites/devices to absorb and/or reflect the EMI radiation.     

大极板始极片机组综合矫平装置及其改进

介绍了国产大极板始极片机组的综合矫平装置,分析了影响始极片平面度的各种原因．提出了提高始极片平面度的多种方法,探索大极板始极片机组提高阴极板悬垂度的有效措施。     

冷轧板边裂原因分析及预防

从热轧原板材料缺陷性能、冷轧工艺等方面分析了冷轧板边裂产生的原因.认为冷轧轧机负荷分配和机架间张力控制不当是边裂产生的主要原因,热轧板边部混晶和硬度波动对其边裂有一定影响.优化冷轧工艺,有效控制热轧板组织均匀性,是解决边裂的主要措施.     

Analysis of Sheet Curvature in Asymmetrical Cold Rolling

 In asymmetric cold rolling, the workpiece is often bent downwards or upwards. A two-dimensional explicit dynamic finite element model with Arbitrary Lagrangian Eulerian (ALE) adaptive meshing technique has been employed to simulate asymmetrical sheet rolling, in which asymmetrical conditions are here due to different roll radii. To validate the simulation, the results of simulation and experiment are compared. Effects of asymmetry due to roll radii mismatch on the normal and shear distributions and on sheet curvature variations are discussed. An optimum roll radii ratio could be found to produce flat sheet. Trials were conducted to investigate the effectiveness of roll radii mismatch as an approach of sheet curvature control.