带极电弧堆焊的卷边法

1.前言近几年来,随着原子能工业和化学工业的发展,由于耐蚀压力容器的大形化,需要采用特厚钢材,为此,除了采用爆接覆层和辊压覆层外,采用带状电极埋弧堆焊的方法,也是比较多的。带状电极堆焊,焊道宽广而平滑,熔敷效率高。又因母材的熔化深度浅,故对母材成分     

铜铝接头的电弧焊接

在电气設备安裝工程中,鋁母綫与鋁母线之間或铜母綫与銅母錢之間的連接,可以广泛采用螺栓連接、压接、焊接等方法。但是当鋁母线与变压器、隔离开关、絕緣套管、放电器、油遮开关、电抗器等电气設备相連接时,由于这些设备的引出端是銅制的,因此就会發生     

摩擦压接磁性-非磁性合金材料

日本新光电机最近成功地采用摩擦压接方法把用于位移传感器中的直径为 3ｍｍ的细金属棒结合在一起 ,其结合强度较螺栓连接、钎焊结合高出 30 % ,该法不仅用于位移传感器而且还可用于微型机械、小型电气部件等的制作。可以说这是一个划时代的连接技术。目前铜、铝等磁性、非磁性材料的结合多半是采用螺栓、螺母连接。位移传感器应用于检测冲压机压痕的位置、发电厂输出控制阀开闭位置以及高速旋转体振动的检测等 ,机器运行时 ,振动强度、高速运动的频度提高易使结合部破损 ,高强可靠性高的重要保安部件的制法是一项很大的研究课题。摩擦压接…     

内外组合电极的ECT传感器优化设计

电容层析成像技术具有“软场”特性。针对敏感场中心区域灵敏度低的问题，设计了一种基于内外组合电极的ECT传感器。利用Matlab2014a和COMSOL5.3对具有内外不同电极数的传感器进行有限元分析，在此基础上，采用双电极旋转激励的测量方法，利用Landweber迭代算法，对ECT敏感场内圆形区域和环形区域进行图像重建。仿真结果表明：与传统的ECT电容传感器相比，改进的传感器能够提高大多数敏感场内中心区域的灵敏度，提高图像的重建精度，相关系数提高至0.92，表明了内外组合电极的传感器在ECT图像重建领域的可行性和有效性。     

T10A和40Cr钢超塑压接接头显微组织

采用特殊的表面处理方法，可使Ｔ１０Ａ和４０ｃｒ钢在空气炉中实现超塑性压接，压接温度７６０～７８０℃、变形速率２×１０￣（－４）ｓ￣（－１）、压力５０～９０ＭＰａ、时间５～１０ｍｉｎ，接头可获得与基材４０Ｃｒ一致的强度。研究了压接区的显微组织，测定了碳浓度分布。     

复合绝缘子压接机的机电液一体化系统设计

介绍了加工复合绝缘子的压接机的机电液一体化系统设计，该系统采用单片机控制复合绝缘子的压接过程，同时单片机与上位机PC进行通讯，实时显示压接过程中的各个关键测量数据，对产品是否合格进行判断。     

汽车起动机换向器伺服压机设计

针对当前汽车起动机换向器压装工艺及压装设备存在的问题，设计一种新型的汽车起动机换向器伺服压装设备。该设备采用激光感应传感器检测转子轴上的槽口位置，用压力传感器监测压入力，采用伺服电机作动力源，从而实现精确控制汽车起动机换向器压装的尺寸要求和对压入力实施有效的监视及控制。     

游离氰测定仪的研制

游离氰测定仪用于金矿氰化液中的游离氰化钠浓度分析。仪器采用银离子选择电极为传感器，流通测量池，直拉显示分析结果。分析了仪器的原理、组成及使用方法。     

2.45 GHz强流脉冲质子源

介绍了一台用于强流质子直线加速器注入的2.45GHz电子回旋共振强流脉冲质子源。采用2.45GHz的微波馈入实现以氢气为载气的氢等离子体,在三电极引出系统下获得能量50keV,50mA的强流脉冲离子束。其中三电极分别为等离子体电极、抑制电极及地电极。用CST仿真软件和PBGUNS分别模拟计算了匹配波导能量的传输效率与引出束流传输轨迹,得出信号输入端口反射系数S11约为0.119,整个匹配波导内正向传输系数S21为0.993,引出束流在Z=26cm处,束流包络约为2cm。研究了离子源轴向磁场变化对引出束流强度的影响,结果得出,当螺线管电流从0A增加至50A时,引出混合束流强度从20mA上升至50mA。     

铝合金TIG焊变极性参数对阴极清理及钨极烧损的影响

采用变极性钨极惰性气体保护焊(VP-TIG)方法焊接铝合金时,需要在保证阴极清理区宽度的同时减小钨极烧损程度。通过调节电极接正半波时间、电极接正半波电流和变极性频率,来考察铝合金VP-TIG焊接过程中变极性参数对阴极清理区宽度和钨极烧损情况的影响。试验结果发现,电极接正半波电流时间和电极接正半波电流的增大都会使阴极清理区的宽度和钨极烧损程度增大,但变极性频率对两者影响很小。进一步研究可以发现,阴极清理是一个热和力共同作用的结果,而钨极烧损是一个热量积累的作用结果。     

An Integrated Force Sensor Solution for Process Monitoring of Drilling Operations

Two piezo electric force sensor rings were developed and integrated into a direct driven motor spindle for online process monitoring of machining processes. Experimental results are presented which demonstrate the performance of the integrated force sensor during drilling operations. Performance comparisons are made between the integrated force sensors and traditional monitoring sensors such as motor power and acoustic emission. The non cutting influences such as spindle dynamic loading contained in the integrated sensor signals are identified. The potential application of the integrated force sensors for process monitoring encompassing tool condition monitoring, spindle condition monitoring and collision detection is demonstrated.     

Multi-layer compounds with integrated actor-sensor-functionality

A method is presented to integrate the cost and time consuming afterwards-joining technologies of piezo actors and sensors direct in the forming processes for metal blank structures. Possible applications for such parts are vibration/ noise damping, deformable shape control, energy harvesting or several sensor tasks. Different forming processes are experimentally investigated and the limits according to deformation of the brittle piezo components discussed. In the numerical research the piezomodule components (piezo fibre, electrodes and plastics embeddings) are homogenized to create a computation-time reducing simplified material model. In a back-transfer of global loads in the forming simulation a representative volume element (RVE) with cyclic boundary conditions is used to evaluate the loading of the piezoceramic material to describe the function degradation due to forming operation. The comparison of numerically and experimentally determined results in a linear manner lead to the necessarity of further numerical research. The location of maximum piezo-patch loading corresponds well with the numerical investigation. The numerical integral model for function degradation shows a large difference in comparison to the integral experimentally determined values. Therefore extensive experimental research direct on the piezomodule outside the forming compound is planned to fit the degradation model in a nonlinear manner.     

Flexible film systems: Current understanding and future prospects

The electrical and mechanical properties of metal films on polymer Substrates are of interest for use inflexible electronic devices and sensors. In these Systems, film deformation mechanisms are comparable to those from free-standing films but the influence of the Substrate and the Interface on the film properties is yet to be fully understood. This understanding is critical to further design improvements and advanced in situ characterization holds the promise of making this possible. With the aid of such techniques direct Observation of failure and deformation mechanisms has become possible.     

Design of Micro-photonic Beam Steering Systems

The paper introduces a direct photonic beam steering device, which is intended to be used as a large scale all optical switch array for communication networks. The objective is to direct the light beam with two degrees of freedom, so the beam from any of the input ports can be sent to any of the output ports, satisfying the optical and operation requirements. The technology is enabled through the integration of microelectromechanical systems, thin film piezo actuators, optical engineering technologies, and Axiomatic approach to systems design. The curved electrode electrostatic and thin film piezoelectric actuators are simulated in advance to the microfabrication processes. This technology has the potential of many novel applications such as: all optical switching, microendoscopy and gazable microeye among others.     

A Piezo Tool Actuator for Precision Turning of Hardened Shafts

A piezo actuator based fast tool servo is presented for precision turning of cylindrical shafts. The monolithic actuator housing transmits motion to the tool assembly using solid flexures. The actuator has a stroke of 36 μm, 3200 Hz natural frequency, and 370 N/μm stiffness. Two sets of additional piezo actuators are placed in the transverse direction to clamp the tool for increased stiffness during hard turning operations. A sliding mode controller rejects cutting forces and compensates the piezo stack nonlinearities. The tool position is controlled to within 10 nm during finish hard turning on a conventional CNC lathe.     

带钢在线定点标印的数学模型及控制方法

介绍了先喷印再衬纸、复膜后横切的工艺条件下同步定点喷印的数学模型和控制方法     

Laser patterning of thin film sensors on 3-D surfaces

Thin film strain sensors applied directly on machine components provide high reliability. However, sensors patterned by standard photolithographic processes are limited to planar surfaces. To overcome these limitations we developed a 3-D capable direct patterning process for NiCr thin film sensors based on ultrafast lasers and galvanometer scanners. Our investigations showed that strain sensors with spatial resolution of 30 μm can be patterned on 3-D shaped machine tool components even at extremely tilted surfaces (up to 70°). First machining results and sensor tests indicate that laser thin film patterning enables efficient and automatable production of novel sensor concepts, e.g. for automotive, medical and machine tool applications.     

一种吸湿固化可剥离耐腐蚀封存涂料

以多异氰酸酯和聚醚多元醇为基本原料合成了一种以吸湿固化为成膜机理的有机高分子树脂，添加复合缓蚀剂、抗氧剂、紫外线吸收剂和流平剂等助剂，研制了一种可剥离涂料。涂层性能检测结果表明，该涂料在高湿度下可快速成膜，具有良好的介质阻隔性能、耐腐蚀性能和易剥离性，可应用于零部件表面的临时性贴体防护。     

PVDF压电薄膜制作传感器的理论研究

利用PVDF压电薄膜制作传感器是近年来传感器领域的研究新热点。通过对PVDF压电薄膜压电性能的研究，导出PVDF压电薄膜的传感方程，从而为用其制作传感器提供了理论基础，并对偏转角θ进行分析讨论。     

Sensors in Spray Processes

This paper presents what is our actual knowledge about sensors, used in the harsh environment of spray booths, to improve the reproducibility and reliability of coatings sprayed with hot or cold gases. First are described, with their limitations and precisions, the different sensors following the in-flight hot particle parameters (trajectories, temperatures, velocities, sizes, and shapes). A few comments are also made about techniques, still under developments in laboratories, to improve our understanding of coating formation such as plasma jet temperature measurements in non-symmetrical conditions, hot gases heat flux, particles flattening and splats formation, particles evaporation. Then are described the illumination techniques by laser flash of either cold particles (those injected in hot gases, or in cold spray gun) or liquid injected into hot gases (suspensions or solutions). The possibilities they open to determine the flux and velocities of cold particles or visualize liquid penetration in the core of hot gases are discussed. Afterwards are presented sensors to follow, when spraying hot particles, substrate and coating temperature evolution, and the stress development within coatings during the spray process as well as the coating thickness. The different uses of these sensors are then described with successively: (i) Measurements limited to particle trajectories, velocities, temperatures, and sizes in different spray conditions: plasma (including transient conditions due to arc root fluctuations in d.c. plasma jets), HVOF, wire arc, cold spray. Afterwards are discussed how such sensor data can be used to achieve a better understanding of the different spray processes, compare experiments to calculations and improve the reproducibility and reliability of the spray conditions. (ii) Coatings monitoring through in-flight measurements coupled with those devoted to coatings formation. This is achieved by either maintaining at their set point both in-flight and certain spray parameters (spray pattern, coating temperature…), or defining a good working area through factorial design, or using artificial intelligence based on artificial neural network (ANN) to predict particle in-flight characteristics and coating structural attributes from the knowledge of processing parameters.