首页期刊导航|Key engineering materials
期刊信息/Journal information
Key engineering materials
Trans Tech Publications Ltd.
Key engineering materials

Trans Tech Publications Ltd.

半月刊

1013-9826

Key engineering materials/Journal Key engineering materials
正式出版
收录年代

    Joint Formation Mechanism and Strength in Resistance Microwelding of Brass Sheet to Fine Insulated Cu Wire

    B.H. MoZ.N. GuoY.B. LiC. Liu...
    P.461-465页
    查看更多>>摘要：Resistance microwelding is an important microjoining process used in the fabrication of microelectronics, MEMS and medical devices. However, the process is infeasible in the situation of terminating insulated copper wire to metal sheet due to the hindrance of the insulation coating in common opposed configuration. To address this problem, a revised electrode configuration is used. The effect of main process parameters (welding current, weld time and electrode force) were investigated by detailed mechanical testing and metallurgical examinations. A bonding mechanism with several main process stages (wire cold collapse, coating melting and withdrawing, and solid-state bonding) was proposed.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Electrostatic Control and The Need of Feedback Control lonization in Critical Environment of MEMS Manufacturing Process

    Anusorn ChakkaewWisut Titiroongruang
    P.466-470页
    查看更多>>摘要：This paper describes new electrostatic control countermeasures and solutions for critical electrostatic control environment for MEMS manufacturing processes, especially in MEMS's wafer handling that needs low electrostatic voltage. This includes personnel grounding methodology, ESD event measurement, and low ion imbalance ionization to support current and future needs of the MEMS.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    An Easy-to-Manufacture 2 Degree-of-Freedom Remote Center of Compliance for Micro-Transfer Printing

    Numair AhmedReza SaeidpourazarPlacid M Ferreira
    P.471-477页
    查看更多>>摘要：This paper presents the design and development of a remote center of compliance (RCC) for a stamp holder for the micro-transfer printing process. One important aspect of the design of an automated printer to implementing the micro-transfer printing process is the generation of conformal contact between the stamp and the donor and acceptor substrates. Orientation errors during set up make this very hard to achieve with the introduction of some compliance. To introduce such compliance without the loss of overlay registration accuracy, a 2 degree of freedom (2-dof) remote centre of compliance is designed into the stamp holder so that its instantaneous rotation center at the face of the stamp. This design is implemented using flexure hinges in a configuration that makes the resulting system compact, in-expensive and easy to manufacture.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Screw-Driven Multi-Channel Peristaltic Pump for Pneumatic Micro Actuator System

    Wonsei RhieToshiro Higuchi
    P.478-482页
    查看更多>>摘要：The authors have developed a miniaturized peristaltic pump which is characterized by multi-channel, low pulsation, high pressure resistance and portability. The pump mainly consists of a disposable pumping channel unit and reusable actuating parts. The pumping channel unit, made of silicone elastomers, has eight pumping channels. The operation principle is based on the peristaltic motion of pumping channels that are occluded by the screw shaft. The shaft rotating inside the pumping channel unit has a spirally arranged projection which deforms and closes down the channels. While the shaft rotates, the pinched locations in the channels move either way according to direction of rotation, squeezing out the air inside. The maximum discharge pressure generated was about 160 kPa at rotating speeds of 30 ～ 180 rpm. A micro pneumatic actuator was fabricated to demonstrate the performance of the pump. The validity of the pump for pneumatic actuation was reported.
      原文链接:
    • NETL
    • NSTL

    Hot-Embossing of Microstructures on Large Area of Polymers

    LIN WeiCHEN WenjieKIEW Choon MengNG Chuen Leong...
    P.483-487页
    查看更多>>摘要：This paper addresses the limitations of current hot embossing machines for mass production applications. It describes the features of a hot embossing machine in terms of machine design for handling large surfaces, embossing head for fast and precise temperature control, and the alignment mechanism for controlling the residual uniformity and planar offsets for producing microstructures uniformly on large area by means of step-and-repeat method. The developed machine demonstrated that microstructures of features size of up to 100μm could be replicated in 250s on PMMA sheet with an electroplated nickel stamp. The linear dimensions of the embossed features however were generally smaller than those in the stamp, which highlighted the importance of precision process control.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Micro-object orientation control by using different vibration modes of board stage

    Toshitake TATENOAkira KAKUTAKotaro OKUI
    P.488-492页
    查看更多>>摘要：This paper deals with an orientation control method for micro objects, which have a size in the order of 100 micro meters, by using a board stage that is vibrated in the natural frequencies of various vibration modes. Orientation control is important for manufacturing processes, such as the assembling of small parts. Since it is difficult to grip and to manipulate micro objects, a simple and reliable method is desired. In this paper, the vibration mode is used for generating different motions of the stage and for controlling the orientation of the objects on the stage. Since each vibration mode has a unique vibration motion, different motions can be selected by choosing the vibration frequency. In order to design the stage so that the objects turn toward target direction, Finite Element Method (FEM) analysis was applied. And, the designed vibration stage was fabricated using a stainless steel thin plate. Experimental results showed that the actual vibration is similar with the simulation results. As an example of the orientation control of the micro objects, some small electronics parts were tested and they could be turned toward the target directions.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Precision Motion Control with Active Eddy Current Damper

    Chek Sing TeoChea Jack OngC. J. HoS. Huang...
    P.493-497页
    查看更多>>摘要：This paper describes the design and proof of concept for an active eddy current damper which is integrated into a single-axis linear motor. Although developments on active eddy current damper are well documented, none has been implemented in a linear motor. The advantage of such a system is two-fold. Firstly, the relative motion between the magnets and the conducting sheet produces eddy currents resulting in an electromagnetic force opposing the direction of motion; which can be utilized to suppress vibrations. Secondly, it is possible to enhance the damping effect of the system; Due to environmental noise, it is normally not possible to increase the D coefficient in a PID controller as much as desirable. The damper is thus able to supplement this damping effect to improve settling time. Here, we will present the damper design as well as the preliminary experiment results for both vibration suppression and motion damping.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Piezo Actuator and Its Hysteresis Compensation For an Active Clamping System in Wood Machining

    Hans-Werner HoffmeisterKingliana LoeisBernd-Christian Schuller
    P.498-502页
    查看更多>>摘要：The modeling and compensation of hysteresis in piezoelectrically driven systems are very important for positioning and noise and vibration reduction applications. An active vacuum clamping system for a stationary wood machining center with piezo actuators for the purpose of vibration control has been developed. This active system is intended to reduce workpiece vibrations, which are excited during machining. However, the piezo actuators have an inherent hysteresis effect between input voltage and output position of the vacuum plate. The Bouc-Wen and the Classical Preisach methods are studied in this paper to model the hysteresis curves and to compensate the hysteresis effect of the integrated piezo actuator.
      原文链接:
    • NETL
    • NSTL

    An Multi-Axis Spindle for Automated Coaxial Alignment

    Chen WenjieLin WeiLuo HongWong Lye Seng...
    P.503-507页
    查看更多>>摘要：Coaxial alignment is an important process in the machining of cylindrical-shape miniature components with an inner bore. It requires aligning the axis of the inner bore with respect to the machine rotational axis precisely. In this paper, we present a spindle with automated coaxial alignment capability for machining applications of the components such as ferrules and capillaries. This spindle includes a novel orientation-adjustable mechanism and a vision-guided feedback system. The adjustment mechanism consists of two pieces of flexural bearings, which can provide the spindle with 4 DOF adjustments without any backlash. The vision-guided feedback system comprises the component face image processing and the through-bore light intensity processing, both of which provide the information of translational and angular offsets. A prototype of the spindle was built to verify the technology we developed. The results show that the system can achieve superior coaxial alignment performances.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd

    Development of a Linear-motor-driven Table Supported by Hydrostatic Water Bearings: Effect of Air Volume Contained in Water-supply Tube on Pitching Motion of Table Slider

    Akinori YuiGo OkahataShigeki OkuyamaHisashi Kobayashi...
    P.508-512页
    查看更多>>摘要：A linear-motor-driven table supported by hydrostatic-water bearings had been developed. The table slider is supported by a single-sided recess type bearing system and preloaded by attractive force using a linear-motor magnet. Since eccentric excitation force is applied to the table slider due to the change of attractive force according to the magnet track position of the linear-motor, pitching motion of the table occurs. This paper investigates the effect of air volume contained in a water-supply tube on the pitching motion. Larger air volume results in lower natural pitching frequency of the table slider, lower logarithmic decrement of the pitching motion and larger pitching angle. When the natural pitching frequency corresponds to the frequency of the eccentric excitation force during table feed, pitching angle grows by resonation.
      原文链接:
    • NETL
    • NSTL
    • Trans Tech Publications Ltd