Design and development of a new machine vision wire bonding inspection system

In this paper, we developed a fast and robust machine vision system for wire bonding inspection. The defects caused by a bonding wire being broken, lost, shifted, shorted, or sagged in an integrated circuit (IC) chip can be inspected automatically. A new lighting environment was devised which will highlight the slope of the bonding wire and suppress the background from being extracted. First, a set of machine vision algorithms were designed to filter out the defects of broken wire, lost wire, shifted wire, and shorted-out wire. Second, the 3-D type defect of sagged wire can be detected by inspecting the change of the bonding wire slope, derived from a single 2-D image. Some illustrations are given to show the efficiency and effectiveness of the proposed novel wire bonding vision inspection system.     

高线吐丝机头部定位控制系统的改进

设计了一种基于国产吐丝机的头部定位控制系统,针对当前国内高速线材吐丝机的特点,该系统采用了改变精轧机前的飞剪剪切长度和吐丝机的转速相结合的方法,实现对吐丝机的头部定位,并成功应用于某钢铁公司高轧线,取得了良好的经济效益.     

一种线性驱动TEC温控系统的设计

设计了一种基于模拟控制技术的半导体制冷器(TEC)温控系统,具有响应速度快、精度高、效率高等优点,经过实验验证,该系统可在环境温度10~40℃(范围内实现对孵育器的25℃(控温,精度达到0.05℃,可满足化学发光免疫反应所需的条件。     

新型直线步进电机驱动的活塞压缩机理论设计

介绍了用直线步进电机直接驱动的往复活塞压缩机的基本结构、工作原理和控制方法。直线步进电机驱动的活塞压缩机不仅减少了传统的由旋转电机驱动的往复压缩机机械损耗大的缺点，而且克服了以往直线电动活塞压缩机和电磁振动活塞压缩机活塞行程控制复杂的难点。     

Design and control of a new linear magnetic actuator for squeeze film damper

A new model of a linear magnetic actuator (LMA) that can be applied to the controllable squeeze film damper (CSFD) was proposed, designed, and fabricated. To validate the operation of the proposed actuator, a mathematical model of the proposed LMA was derived through experiments. From the experimental results it was verified that the electromagnetic force depends upon the position of the mover (the outer damper ring of the CSFD) and the applied current. Also, the electromagnetic force varies symmetrically with the position of the mover within the working region. A self-tuning fuzzy PID controller was applied to control the position of the novel LMA. Further, the proposed LMA was assembled in the squeeze film damper (SFD), where the clearance can be controlled by LMA. To investigate the damping effect of the damper under various clearances by controlling the LMA, experiments on the rotor test-rig were conducted. From the experimental results, the proposed device, which is composed of SFD and LMA, was verified to be very effective for attenuation of the vibration of the rotor system. This paper was recommended for publication in revised form by Associate Editor Dong Hwan Kim Kyoung Kwan Ahn received the B.S. degree in the department of Mechanical Engineering from Seoul National University in 1990, the M. Sc. degree in Mechanical Engineering from Korea Advanced Institute of Science and Technology (KAIST) in 1992 and the Ph.D. degree with the title “A study on the automation of out-door tasks using 2 link electro-hydraulic manipulator” from Tokyo Institute of Technology in 1999. He is currently a Professor in the School of Mechanical and Automotive Engineering, University of Ulsan, Ulsan, Korea. His research interests are design and control of smart actuator using smart material, fluid power control and active damping control. He is a Member of IEEE, ASME, SICE, RSJ, JSME, KSME, KSPE, KSAE, KFPS, and JFPS. Truong Quoc Thanh received the B.S degree in the department of Mechanical Engineering from Hochiminh City University of Technology in 1998, and the M.Sc. degree with title “Dynamic stiffness method in calculation vibration of structure” from the master program of mechanics under Inter-University Cooperation Program between Liege University (Belgium) and HCMUT (Vietnam) in 2000. From 2000 to 2004, he worked as a lecturer in the mechanical department of Hochiminh City University of Technology. His teaching subjects are relevant in Advanced Manufacturing Methods, Measuring Technique and Manufacturing Technique. He is currently a Ph.D. candidate at the University of Ulsan. His research interests focus on designing and manufacturing of new actuators, vibration control theory and application theories.     

新型数控弯管机控制系统设计

基于嵌入式运动控制器,设计了新型数控弯管机控制系统,完成控制系统硬件和软件设计.成功地将开放式数控用于弯管加工自动化.系统具有结构紧凑、经济实用、易于维护、升级等特点,达到工业生产应用要求.市场前景广阔,值得推广.     

Design, drive and control of a novel SMA-actuated humanoid flexible gripper

An elemental SMA actuator, consisting of an elastic rod with two embedded SMA wires, is presented. The recovering wire w1, with remembered ‘U’ shape, is located along the rod’s axis. The restoring wire w₂, with memorized straight shape, is located in parallel with the rod’ axis with an offset distance d ₁. Two strain gauges, arranged in complemental configuration and sticking to the rod, are used to implement accurate displacement control. Upon the elicitation of the structure of a human being’s hands, a finger with multi-units is proposed. The finger has two flexible rods with embedded SMA wires and one shorter rod as a connecting part. The number and position of fingers are investigated by making use of a nonlinear plan process with an index W, a function of grasp matrix G. The hardware of the drive and control system of the gripper has been completed on the base of a DSP chip. After the track plan is realized in the joint space through B spline interpolation method, the software of the position control system is fulfilled through two-staged slide control strategy. The simulations and experiments of step response of the SMA actuator are carried out. It is shown in the experiments that the maximum angle between ends’ tangents of each finger is 68.5, 79 and 79 degrees, respectively, and the tip of each finger could reach its final position by using approximately the same time period.     

数控机床直流直线电机结构设计及控制系统研究

为解决现有直线电机存在边端效应、推力波动大以及控制系统复杂等问题,设计出一种新的直流直线电机结构,并对该电机的数学模型和动态特性进行了较为深入的分析.针对单闭环系统受绕组电压、负载和动子质量的影响,易出现电流和速度波动等问题,设计了多环结构的控制系统,并引入前馈控制方法改善了系统动态跟踪特性.基于上述分析,利用MATLAB对系统进行了仿真研究,结果显示所设计的电机结构具有较好的可行性和可控性,且引入前馈控制的多环控制系统可有效抑制电流和速度的波动,使系统的动态跟踪特性得到显著提高.     

钢丝绳起重机导绳器的设计

GB6067-1985《起重机械安全规程》要求纲丝绳在卷筒上应按顺序整齐排列。GB6974．4-1986《起重机械名词术语-机构和零部件》对导绳器的解释为排绳器,定义为能使钢丝绳按规定间隔整齐地绕上卷筒装置。以往采用的导绳器有块式和圆环式导绳器,目前块式导绳器已基本不采用了。在用的起重机所安装的导绳器一般如图1、图2所示类型。工作原理都差不多,导绳器本身不能转动。当卷筒转动时,随钢丝绳卷绕。     

基于PLC的药芯焊丝成型机自动控制系统的设计和开发

药芯焊丝成型机是生产药芯焊丝成套设备中的重要组成部分.为了提高张力控制效果,本文根据秒体积流量相等原理提出了电机运行速度调节算法.在此基础上,采用西门子S7-300 PLC设计并开发了药芯焊丝成型机自动控制系统,包括控制系统的功能与结构设计、硬件设计以及软件设计和开发,实现了对钢带法生产药芯焊丝成型机生产线的有效控制,...     

基于PLC的TAB绑定机控制系统设计

本文介绍了TAB绑定机的工作过程,利用三菱PLC实现TAB绑定机的自动控制.对系统的控制功能、硬件配置和软件设计进行了讨论,提供了I/O接线图,给出了程序设计流程.系统设计合理,可靠性高,实用性强,在实际生产中运行良好.     

多吸嘴焊头机构固晶机设计

LED固晶机是LED封装的重要设备,而焊头机构则是固晶机最重要的部分。基于Solid Works设计一种多吸嘴固晶机的焊头机构模型,能高速高精度运行。采用了多吸嘴焊头机构的设计,单次取晶固晶行程减少,且取晶固晶能同时进行,相比较于传统单吸嘴焊头机构的固晶机而言,其固晶速度大大提高。最后基于ADAMS软件对固晶机的吸嘴进行取晶固晶的接触力分析,其结果满足固晶的工艺要求。     

Improving bonding strength of tape-automated bonding technology by implementing statistical process control: a case study

The purpose of this paper is to improve the bonding strength of tape-automated bonding (TAB) technology in supertwisted nematic liquid crystal display (STN LCD) module manufacturing by double-process control. First, the quality characteristic – the output of the process – is monitored by control charts and the variation of the process is reduced. Later, it is found that the quality characteristic is affected by critical input process parameters. These critical input process parameters and the quality characteristic are therefore monitored simultaneously. By this double-process control, the deviation of the process is further reduced. The results show that process capability and yield rate are increased.     

高速卷绕头网络控制系统的设计与实现

主控机、工控机、可编程逻辑控制器(PLC)和变频器(FC)构成的网络控制系统中，利用RS-232与RS-485接口实现主控机、工控机、可编程逻辑控制器和变频器之间的通信，具有成本低，易于实现多机联网控制．抗干扰能力强等优点。本文主要介绍了RS-232接口通信系统的设计方法与实现。     

Static and dynamic characteristics of a novel moving magnet linear compressor

Journal of Mechanical Science and Technology - Linear compressors are popular in the field of household refrigeration due to their high efficiency and excellent capacity modulation capability. In...     

一种五面复合镗铣头设计

在分析当前龙门式加工中心常用镗铣头优缺点基础上,提出一种新型五面复合镗铣头结构,介绍五面复合镗铣头传动结构,及其自动分度、自动装卸、自动换刀的工作原理和动作过程。     

金刚石线锯截断机的设计与应用

随着IC产业与光伏产业的迅速发展,硅片的应用范围越来越大,对硅片加工技术越来越重视.与发达国家相比,我国在硅材料的截断、切片等切割技术及设备等方面的研究与制造还相对落后.本文较详细地介绍了采用固结磨粒金钢石线切割技术的截断机设计,并从切割尺寸、切割损耗及切割效率等方面对研制设备的使用效果进行了比较说明.     

新型直线电机支持向量机非线性建模研究

以一种新型圆筒直线电机为研究对象,通过建立直线电机的有限元模型及试验验证,获得了直线电机的一种仿真计算方法。在正交试验设计和随机试验设计的基础上,建立了直线电机性能参数的样本空间,采用支持向量机(SVM)回归建模方法,建立了直线电机的非线性数学模型,并将有限元模型和SVM模型进行了比较,证实了SVM模型的可靠性和高效性。     

新型悬丝约束支撑微纳测头的变刚度特性分析

针对传统微纳测量装置在测量过程中测头支撑机构刚度不可变化的问题,设计了一种基于悬丝约束支撑的变刚度微纳测头。利用压电装置驱动柔顺导向机构产生位移,以改变悬丝所受的轴向张紧力。基于应力刚化原理改变悬丝的横向刚度,进而改变测头支撑机构的整体刚度,以获得具有变刚度性能的新型微纳测头。根据测头支撑机构在测量过程中刚度的变化,分别建立刚性和柔性模式下微纳测头Z向和横向的刚度理论模型。根据有限元仿真和刚度理论模型,分别得到测头刚度随悬丝端面受力的变化曲线。对比测头刚度的仿真值和理论值,得到测头Z向和横向刚度的平均相对误差分别为2.41%和4.72%,结果表明理论模型具有较高的准确性。研究成果为该类型测头的变刚度控制奠定了前期理论基础。