基于PLC控制的钢筋网下料机械手控制系统

针对设计的焊接钢筋网下料机械手,分析下料工作要求和机械手的结构和动作要求,给出机械手的工作流程,绘制控制系统原理图,利用PLC实现自动控制。通过PLC控制可以实现焊接钢筋网的自动抓取下料,并且能够按照生产要求实现多位置准确码垛。     

一种用于激光切管机的机器人码垛系统设计

本文以济南铸锻所生产的FL809i数控激光切管生产线的下料机构为研究对象,设计开发了一种利用机器人实现自动码垛的系统,主要用于中等厚度矩形管材的全自动下料,具有生产效率高、码垛效果好、成本低等特点,应用前景广阔。     

间距可调式钢筋网焊机焊接回路的设计

针对目前同种钢筋网焊机只能焊接网格间距固定钢筋网架的局限性,设计出一套焊接气缸和下电极可以左右移动的焊接机构。该机构通过移动焊接气缸与电极的方式来调节改变钢筋网架的网格间距,根据钢筋网焊机网格间距可调的特点对焊接变压器与导电铜排进行合理的设计布局。综合考虑焊接回路中电阻和感抗等因素对回路进行优化设计,然后用测量大网格钢筋网焊机焊接回路参数的方法对比计算出所要设计的间距可调式网焊机焊接回路阻抗的大小,根据回路中阻抗的大小选择合适的焊接变压器,从而使所设计的焊接电路能够满足网焊机网格间距可调的要求。     

电池极耳多工位激光焊接夹具设计

针对圆柱电池极耳与盖帽的焊接,采用激光点焊方式。为提高焊接生产效率,设计了转盘式多工位焊接夹具,上、下料过程与激光焊接过程同时进行。为了便于人工上、下料,设计多组夹具,上料完成后,夹具自动夹紧,焊接机构自动焊接,形成高效的半自动化焊接生产线。     

动力锂电池盖帽焊接夹具设计

针对动力锂电池盖帽的焊接设计了多工位夹具,由上料部分、压紧部分和下料部分组成。气缸为压块提供压紧动力,上料夹紧,实现激光焊接,下料实现手动和自动联动控制,能提高生产效率及稳定性。     

六自由度机器人的运动学分析及码垛轨迹规划

现如今生产过程中的码垛场景多为专用的四自由度码垛机器人,通用性和灵活性较差。为提高码垛过程中机器人的通用性和灵活性,实现六自由度串联机器人的码垛,根据改进D-H法,在UR5机器人各关节末端建立固连坐标系,推导出UR5的正运动学变换矩阵及逆运动学各关节表达式。使用梯形速度控制,确定了码垛过程中直线轨迹部分的运动规律,得到了码垛过程中圆弧轨迹部分的坐标转换关系及机器人末端运动过程。在空间中规划出码垛时机器人末端轨迹,并进行仿真。绘制了各关节运动曲线,表明机器人在码垛过程中轨迹平滑,运行平稳,对六自由度串联机器人的码垛研究具有参考意义。     

钢筋焊接网电阻点焊工艺的研究

介绍了钢筋网的自动化生产工艺及其设备构成．研究了电阻点焊工艺参数对冷轧带肋钢筋网焊接质量的影响。结果表明：当焊接电流越强，电极压力越大，焊接通电时间越长时，钢筋网焊点虚焊率越低，压入深度越大。焊接电流时压入深度的影响明显大于电极压力和焊接通电时间。     

多工位全自动焊接圆管的系统设计

针对空调膨胀阀圆管的激光焊接,设计了多工位、全自动焊接系统。采用振动盘上料机构给转盘夹具供料,转盘带动随行夹具运动到指定位置,并且对激光器发出指令出光,同时在旋转机构带动下,工件旋转一周,自动完成焊接。下料机构采用下料机械手抓取产品,放入导向料斗内,自动流入成品料盒内进入下一道工序。     

圆柱电池负极片激光焊自动化生产线设计

采用激光作为焊接热源对圆柱电池中的铝合金圆柱体和中空圆片结构进行焊接,设备主要有上料部分、转盘夹具、压紧夹具、下料组件等部分,在下料过程中增加去除阳极层机械设计,实现激光焊与破阳处理同时完成。其中转盘夹具有自动检测来料功能,通过PLC输出控制信号。整个生产过程无需人工操作,全部实现自动化生产,减少了人工误操作。     

圆柱电池集流片半自动焊接设备设计

针对圆柱电池集流片中镍片与电池壳体的焊接,设计了半自动化焊接设备。设备主要由电池壳上料组件、镍带上料组件、焊接功能组件以及下料组件等组成。实现人工一次性批量上料,然后单个来料自动上料,自动定位、焊接以及下料等功能。该设备采用自动转盘工作站,电池壳上料、镍带裁剪以及上料、焊接、下料工作同时进行,提高了生产效率。经过生产测试,该设备完成单个产品焊接生产时间为2 s,且整个生产只需1个人工,至少节约了4个人力成本。     

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.     

Rheology Feature of Simple Metal Melt

The rheology feature of Sb, Bi melt and alloys was studied using coaxial cylinder high-temperature viscometer. The results showed that the curve of torsion-rotational speed for Sb melt presents a linear relation in all measured temperature ranges, whereas for the Bi melt, the curve presents obvious non-Newtonian feature within the low temperature range and at relative high shear stress. The rheology feature of Sb80Bi20 and Sb20Bi80 alloy melts was well correlated with that of Sb and Bi, respectively. It is considered that the rheology behavior of Sb melt plays a crucial role in Sb80Bi20 alloy and that of Bi melt plays a crucial role in Sb20Bi80 alloy.     

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.