新型无缆管道机器人运动机构的设计

主要研究了一种新型无缆微管道机器人的运动机构的设计。该机器人携带动力转换装置即发电机，并利用流体自身能量来运动和工作。所设计的结构和运动机构能满足机器人实现快速行走、调速、调节转弯及发电等的要求。     

电磁力随焊控制焊接应力装置的研制及应用

高强合金薄壁结构焊接时,存在变形大,热裂敏感性高的问题.针对这一问题,研制了一套脉冲电磁力装置,以实现借助脉冲电磁力无接触随焊控制焊接应力.该装置通过控制储能电容的充电电压调节电磁力大小,电磁力频率在10～90 Hz之间连续可调.应用所研制装置,采用鱼骨状裂纹试验法,对LY12高强铝合金进行了控制热裂纹试验,发现脉冲电磁力可以起到减小焊接热裂倾向的作用;且电路结构简单,控制方便,可靠性高.仿真和试验证明该装置满足设计要求.     

滚动功能部件寿命试验台传动机构的虚拟设计与运动仿真

根据滚动功能部件新产品寿命试验的要求,对寿命试验台的传动机构进行设计。在完成结构设计的基础上,运用Pro/E软件对其进行三维实体建模和虚拟装配,运用ANSYS软件对机构关键零件进行应力分析,并用Pro/E软件的机构分析模块Mechanism对其进行运动仿真分析。仿真结果显示:该寿命试验台传动机构的设计能够满足试验要求,为该试验台整体设计及优化提供了技术支持,缩短设计周期,节约研制经费。     

新型液动快件自动化分拣装置设计

为了加快物流分拣的自动化程度,设计一种新型液动快件自动化分拣装置,利用三维软件UG建立该装置的整体结构示意图,详细介绍了该装置中的托盘机构,利用液压控制回路控制托盘的运动。同时,利用单片机模块控制托盘的三工位动作,实现托盘左、右倾斜和复位,并对该装置中的液压动力装置模块、电机运动控制模块进行详细介绍。试验结果表明,该装置能够满足快件自动化分拣,具有结构简单、运行稳定、效率高、成本低等特点。     

混合驱动五杆机构控制系统虚拟仪器设计

混合驱动机构输出柔性大,能够满足给定的运动规律要求,精度较高,在现代机械工业领域具有广阔的应用前景。设计混合驱动五杆机构PID控制系统,建立混合驱动五杆机构测试控制实验装置,采用LabVIEW开发混合驱动五杆机构测控虚拟仪器,进行实验研究。结果表明:实验装置运行良好,实现了根据输出构件运动规律对五杆机构系统的混合驱动控制,效果较好;虚拟仪器界面友好,操作简单,能很好地满足实验工作需求。     

变步距端子切割机构设计及有限元仿真

提出一种变步距端子切割机构,用于端子联的切割压接,可实现端子联进给、夹紧、切割数量在2~6个间柔性可调。通过UG/Modeling功能建立变步距端子切割机构的三维实体模型,利用UG/Motion运动仿真对所设计机构的三维实体模型进行运动学特性分析,验证该机构运动过程无干涉发生。利用UG高级仿真图形分析该机构运动部件的应力与位移变化情况,找出机构中受力最大、最易破坏变形的受力点,进行可靠性分析;通过有限元分析得出运动部件的应力和位移变化趋于线性,远低于机构的许用值,满足设计要求。该机构已授权发明专利,并与合作企业进行了生产性中试,经过试验验证,证明了该机构的可行性。     

金属试样红外线快速加热装置的研制

开发了一种新型金属试样红外线快速加热装置.该装置采用卤素辐射器,抛物面镀金反射罩,通过水平面对面布置来实现对板状金属试样的快速加热.该装置具有热惯性小、升温速度快、热效率高的特点,可满足对金属试样进行再结晶退火的需要.     

基于遗传算法的柔性铰链参数优化设计

柔性铰链作为导向机构在快速刀具伺服装置中得到广泛的应用,柔性铰链的结构参数设计是快速刀具伺服装置设计中的重要部分。针对三自由度串联式快速刀具伺服装置中柔性铰链导向机构设计,提出了基于遗传算法的柔性铰链参数优化设计方法。首先,根据三自由度快速刀具伺服装置工作时的运动特征,建立动力学模型;然后根据精密加工过程中柔性铰链作为三自由度快速刀具伺服装置导向机构应具备的要求,建立使柔性铰链3个方向刚度最大的目标函数以及约束条件;最后运用遗传算法优化设计柔性铰链,得到最优柔性铰链结构参数。     

卷笔刀架自动定向装置设计与试验

借助试验及分析手段，从卷笔刀架稳定姿势状况及其运动和受力情况入手，设计出了卷笔刀架自动定向装置。文中介绍了振动料斗结构参数的合理选择，刮板剔除机构、光电剔除机构和刀架调头机构的设计。该装置使卷笔刀装配实现了自动化。     

精密加工中零重力垂直运动机构的设计与性能检测

精密加工中垂直运动机构的重力载荷会影响其定位性能,通常情况下采用平衡配重装置或流体缸来进行重力补偿。基于传统的重力补偿原理提出一种新型零重力垂直运动机构,应用于精密加工过程中。该机构采用直线电机直接驱动的方式、磁轭和滚动导轨支撑移动平台和平衡配重装置。由于受干扰的运动部件惯性增加一倍,该机构能有效地减小加工干扰力的影响。装置性能测试结果表明,该机构为移动平台的垂直运动提供了优越的驱动特性。     

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.     

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.     

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.     

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.