DP通讯协议在轮辐加工压力机中的应用

介绍一种轮辐冲孔加工控制系统,主要由压力机控制系统、模具控制系统、机械手控制系统连线组成,有效提高工作效率,降低操作难度。基于DP通讯轮辐加工的压力机连线控制系统,由压力机控制系统、模具控制系统、机械手控制系统连线组成。     

熔盐加热炉控制系统

本文介绍了中国长城铝业公司引进管道化溶出装置中熔盐加热炉的作用和控制系统构成 ,着重阐述了熔盐温度控制系统、重油与助燃风比值控制系统和盘管预热控制系统。     

船舶除锈爬壁机器人控制系统研究

介绍一种船舶除锈爬壁机器人控制系统.根据船舶除锈对爬壁机器人的控制要求,确定了控制系统采用上下位机两级分布式的控制方案,并分别对上下位机控制系统的硬件和软件进行设计.搭建爬壁机器人控制系统的硬件实物,并进行相关实验测试.试验结果表明:该控制系统有较好的应用性能,能够满足机器人控制系统的要求.     

人造板锯切控制系统的应用

人造板锯切控制系统是人造板生产线的重要设备。重点介绍人造板锯切控制系统在连续热压机生产线上的应用,包括控制系统的组成、控制方式、工作原理及过程优化,并简要介绍程序的编写。控制系统的应用结果表明:该控制系统较好地满足了生产和工艺的要求。     

基于Fieldbus和PLC的分布式控制系统综述

现场总线技术和PLC器件的研究与应用,是现代分布式控制系统得以实现的主要途径之一。在概述分布式控制系统发展历程的基础上,以PLC为核心控制器件,结合应用成果,就Modbus支持下的分布式控制系统、Controller Link支持下的分布式控制系统以及Profibus支持下的分布式控制系统进行了讨论,总结并提出了制造业信息化进程中分布式控制系统的发展方向。     

导管架调平器模型样机提升运动控制的电液比例液压系统研究

分析了提升油缸电液比例闭环位置控制系统,阐述了其工作原理;建立了该控制系统的数学模型;利用MATLAB软件对提升油缸的电液比例闭环控制系统进行了仿真,在电液比例控制系统中引入了PID控制器,改善了控制系统,得到了比较满意的控制效果,能够满足水下工程作业的要求.     

基于PROFIBUS现场总线的PLC控制系统设计

采用基于PROFIBUS现场总线的触摸屏和PLC设计压装机控制系统.介绍该控制系统硬件的选型、伺服系统的设计和软件的设计.PLC提高控制系统的可靠性、增强系统的抗干扰能力,触摸屏则为整个控制系统提供良好的人机操作界面,加上伺服控制具有自动、快速、精密的优点,使整个压装控制系统的可靠性提高、运行成本降低.     

基于S7-200PLC的锅炉燃烧自动控制系统设计

燃烧过程控制是锅炉运行过程中的重要控制系统之一。本文采用S7-200系列PLC设计了锅炉燃烧过程的自动控制系统。整个燃烧自动控制系统包括3个子系统,分别为蒸汽压力自动控制系统、含氧量自动控制系统和炉膛负压自动控制系统。通过对燃烧过程被控变量的分析,给出了各个控制方案,并对控制系统进行了详细的硬件设计和软件设计。     

深海采矿装置升沉补偿控制系统研究

介绍深海采矿装置升沉补偿液压系统工作原理,分析控制系统原理,基于PDF算法建立伺服控制系统,通过仿真验证控制系统的可行性.     

玻璃熔窑温度微机监控系统

介绍了基于工控机的玻璃熔窑温度控制系统。该控制系统采用了基于模糊神经元网络的模型参考自适应控制的结构。该控制系统操作界面和系统控制程序采用VC 6．0编制,软件采用标准化模块设计。文章同时也介绍了自适应模糊神经元网络控制系统的设计过程,以及该控制系统的控制原理。最后通过Matlab语言编制仿真软件对该系统进行了仿真。     

CO2腐蚀的研究现状及其控制措施

    综述了CO₂腐蚀的机理、影响因素及所采取的防护措施.重点归纳和阐明了当前对CO₂腐蚀研究及防护中存在的问题,即腐蚀产物层的存在对腐蚀机理和添加缓蚀剂防腐时所带来的影响.     

不锈钢的大气腐蚀

    综述了国内外不锈钢大气腐蚀研究状况,重点从点蚀机理、腐蚀速率和影响因素方面分析了不锈钢大气腐蚀的点蚀特征.     

Electrochemical studies of stainless steel implanted with nitrogen and oxygen by plasma immersion ion implantation

Plasma Immersion Ion Implantation (PIII) of stainless steel with nitrogen at temperatures lower than 400 °C has been reported to increase the hardness of the material by several times. However, expectations that the corrosion resistance will remain unaffected after implantation were not found to be so. In the present study the influence of post-oxygen implantation on the corrosion resistance of nitrogen implanted stainless steel is presented. Stainless steel samples were subjected to oxygen, nitrogen and post-oxygen ion implantation at different temperatures. GIXRD and microRaman studies of the implanted samples showed that oxygen implantation leads to the formation of an oxide layer consisting of corundum and spinel structures. The corrosion properties of the implanted samples were studied by potentiodynamic polarization and electrochemical impedance techniques in 3.5% NaCl solution. After nitrogen implantation the corrosion current increased and the corrosion potential shifted to the less noble side to − 0.486 V as compared to − 0.284 V for the substrate. Oxygen implantation at 400 °C shifted the corrosion potential to the nobler side to − 0.2 V with decrease of corrosion current. For post-oxygen ion implantation at temperatures lower than 400 °C, the corrosion current was higher than the substrate and the corrosion potential was also on the less noble side. However, post-oxygen ion implantation at 400 °C after nitrogen ion implantation resulted in improved corrosion resistance as the corrosion potential shifted to nobler side and the corrosion current was lower than that of substrate.     

钢材阻锈技术的研究与发展

    针对钢铁材料的锈蚀现状,介绍了涂层、缓蚀剂、钢筋阻锈剂、耐候钢等四种比较成型的钢材阻锈技术,分析了这几项技术的研究应用情况和目前存在的问题,指出了钢材阻锈技术未来的发展方向.     

Electrochemical Corrosion Behavior of Dental/Implant Alloys in Artificial Saliva

The corrosion behavior and passive film characteristics of various dental alloys such as Co-Cr, Ni-Cr, Cu-Ni-Al, and commercially pure Ti (c.p. Ti) were evaluated in artificial saliva medium by utilizing electrochemical impedance spectroscopy (EIS), Tafel polarization, and cyclic polarization studies. EIS studies were carried out for various durations viz. 1 h, 1 day, and 7 days to evaluate the stability of passive film and change in corrosion characteristics with respect to time. Electrochemical parameters such as E_corr, i_corr, corrosion rate, passive film characteristics with respect to time were obtained from various studies mentioned above. The corrosion resistance decreased in the order Cu-Ni-Al > cp Ti > Co-Cr (Commercial) > Ni-Cr > Co-Cr (DRDO developed) in artificial saliva solution.     

Evaluation of Corrosion Performance of Titanium/Steel Joint Brazed by Cu-Based Filler Metal

Furnace vacuum brazing has been employed to join commercially pure titanium and low carbon steel using copper-based filler metal with the composition of Cu-10.6Mn-1.9Ni, at.%. Three different brazing temperatures 930, 970, and 1000 °C and a holding time of 15 min were studied and evaluated. The corrosion behavior of the joint in 0.1 M sulfuric acid was investigated using immersion and electrochemical tests. Measurements of corrosion potential, corrosion current density, corrosion rate, polarization resistance, weight loss, and morphology of corrosion attack were used in this study. Experimental results showed that severe corrosion attack of the steel side at the interfacial area is clearly observed. Despite the difference in corrosion rate values obtained by electrochemical and weight loss measurements, the trend of results was identical to a large extent. Corrosion resistance of the joint showed a general tendency to increase with rising brazing temperature. The lowest corrosion rate was obtained for the couple bonded at 1000 °C. Meanwhile, at the lowest joining temperature of 930 °C, corrosion rate showed a higher value. The results of joints corrosion resistance were attributed to the difference in microstructure features and chemical analysis.     

油套管N80钢的乙酸腐蚀行为

模拟油气田环境,采用高温高压釜对油套管N80钢进行失重腐蚀试验.结果表明:N80钢的腐蚀速率随着乙酸浓度的增加呈升高趋势,但在乙酸浓度为3000μl/L时反而比在1000μl/L时低,并且其在含乙酸的腐蚀介质中的腐蚀速率远高于在未含乙酸的腐蚀介质中的腐蚀速率.利用扫描电子显微镜(SEM)、能散X射线谱仪(EDS)和X射线衍射技术(XRD)研究了在不同乙酸浓度条件下油管钢N80腐蚀的特征并讨论了其腐蚀机理.     

Degradation behaviour of ZrO2-Ni/Al gradient coatings in molten Zn

In order to improve the corrosion resistance of metallic materials in molten zinc, ZrO₂-Ni/Al gradient coatings were sprayed on the surface of the Fe-0.35-0.44 wt.% C steel. The corrosion behaviour and corrosion mechanism of the ZrO₂-Ni/Al gradient coatings in molten zinc were studied. The ZrO₂-Ni/Al gradient coatings on the surface of steels prolonged the lifetime of samples and changed the corrosion behaviour of the samples in molten zinc. The lifetime of the ZrO₂-Ni/Al gradient coatings immersed in molten zinc at 620 °C is 28 days, which is 4 times as long as that of the general ZrO₂ coatings. The ZrO₂-Ni/Al gradient coatings were corroded in molten zinc at 620 °C, which was caused by zinc atom diffusing along the crystal boundary and pores of the ZrO₂-Ni/Al gradient coatings, and reacting with Ni/Al particle in the ZrO₂-Ni/Al gradient coatings. The corrosion mechanism of the coatings in molten zinc at 620 °C was crystal boundary corrosion, pitting corrosion and reaction corrosion.     

盐水中离子对G105钢腐蚀速率的影响及腐蚀产物分析

    利用正交实验研究了盐水中离子和温度对钻具钢（G105）腐蚀速率的影响,扫描电子显微镜（SEM）对腐蚀产物膜和去除腐蚀产物后的基体形貌进行观察分析,用X-射线衍射（XRD）分析腐蚀产物物相结构.结果表明,对腐蚀速率影响顺序为Cl^->温度>Ca²⁺>Mg²⁺>Br^-.G105钢在复合盐水中为均匀腐蚀,腐蚀产物为β-FeOOH.     

Inhibition of Corrosion of 3003 Aluminum Alloy in Ethylene Glycol-Water Solutions

In this study, the inhibiting effects of four types of inhibitors, including gluconate, cinnamate, molybdate, and nitrate, on corrosion of a 3003 aluminum (Al) alloy were investigated in ethylene glycol-water solutions that simulate the automotive coolant by various electrochemical measurements. It was found that the tested inhibitors were effective to inhibit corrosion of 3003 Al alloy under both static and turbulent flow conditions. They all behave as anodic inhibitors, which inhibit the Al alloy corrosion by passivating Al alloy and decreasing its anodic current density. A turbulent flow of the solution decreases the corrosion resistance of Al alloy and the inhibiting effect of the inhibitors. The inhibiting effect of the inhibitors is ranked as: nitrate > cinnamate > gluconate > molybdate.