铝箔轧机的厚度控制系统

本文介绍了铝箔轧机过程控制系统 (系统 )中的关于液压缸控制的机架控制系统 ,主要分析了其中的轧制力控制、辊缝控制、厚度计控制。这几种控制都是通过 MSC和 ALC板实现的闭环控制 ,是控制带材厚度的主要手段 ,并给出轧制力控制基准、辊缝控制基准和 GMTR控制基准 ,介绍了开合辊缝以及清零等控制 ,分析和计算了轧机清零的零位偏置。     

DANIELLI可逆轧机自动厚度控制系统应用研究

介绍了DANIELLI六辊可逆轧机自动厚度控制系统,分析了其闭环液压厚度控制原理,讨论了测厚仪补偿、反费控制、前馈控制方式,研究了秒流量控制、速度张力控制在厚度控制中的应用.     

薄带热连轧液压活套控制技术的改进

通过对活套装置控制过程的分析, 结合对热连轧液压活套系统的高度位置和力矩控制双输入、双输出耦合系统控制方法的研究, 提出了薄规格、硅钢带钢的尾部活套力矩控制一定要优先于高度位置控制的思想。通过应用自适应、分段控制等技术, 解决了实际生产中工艺、设备变化对活套控制的影响, 保证了连轧过程中带钢不虚套、不跑偏。该控制方法已在实际的热轧现场得到了应用, 并取得了较好的控制效果。     

电火花加工控制技术综述

介绍了电火花加工原理及其加工过程中涉及的主要控制问题,论述了近20年来应用于电火花加工过程中的控制技术,即自适应控制、专家控制、遗传算法、模糊控制、神经网络控制、灰色控制及其相应的混合智能控制.     

泰钢1700mm六辊可逆冷轧机板形控制技术的应用

介绍了泰钢冷轧厂1700 mm六辊可逆式冷轧机在板形控制方面的经验。通过张力控制、压下量控制、液压弯辊控制、轧辊轴向横移控制及工艺润滑系统控制,有效地改善了板形,提高了轧制产品质量。     

基于PLC的压铸机控制系统设计

针对传统压铸机的控制系统采用继电器控制、微机控制或者仅有简单手动控制的PLC控制特征,通过分析压铸机及其工作流程,进行了PLC控制器硬件选型和接线图设计、控制系统梯形图设计、抗干扰设计等,设计了一种包含手动控制、半自动控制、全自动控制三种控制方式和良好抗干扰特性的压铸机PLC控制系统,并对系统进行仿真软件调试和现场调试,调试结果表明该系统安全、可靠、高效。     

80MN锻造液压机液压控制系统的研制

研制了具有等温锻功能的80 MN锻造液压机液压控制系统.针对能量损耗低和控制精度高的要求,采用了西门子S7-400 PLC与Trio控制器相结合的控制方案,PLC实现液压泵的控制、电液伺服阀的切换、工作台控制、加热与冷却系统控制、润滑系统控制及安全监测;Trio完成速度控制与平度控制的任务,获得了预期的控制结果.     

大型厚壁球墨铸铁件的质量控制

概述了大型厚壁球墨铸铁件的国内外生产情况、研究方法，着重论述了这种铸件的质量控制（包括抗衰退性能控制、凝固时间控制、凝固方式控制）。还简述了大型球铁铸件质量控制研究的新发展。     

超声检测质量控制(续)

针对超声检测的特点,对超声检测质量控制的控制内容、控制范围、控制方法、控制程序和控制要点进行了全面论述,重点强调持续改进。     

超声检测质量控制

针对超声检测的特点,对超声检测质量控制的控制内容、控制范围、控制方法、控制程序和控制要点进行了全面论述,重点强调持续改进。     

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.