Direct Digital Manufacturing Industry Ascendant

The paper introduces the origin of the word of Direct Digital Manufacturing and other forms of address, and the working principles of Direct Digital Manufacturing technology and major types of the technology, hard- ware and software development, use of materials, applications, market growth and its development prospects. Focused presentations of Direct Digital Manufacturing （additive manufacturing） compared to traditional mechani- cal manufacturing industry in the use of prices, processing speed, reliability and cost advantages and characteris- tics. Particularly the significant challenges and competitiveness of Direct Digital Manufacturing technology in the processing of any complexity created directly the number of objects, internal structure and channel function, as well as the shape of the chassis components and structure of the matching and optimization.     

伪三色LED图文显示屏的设计及实现

介绍由８０３１单片机控制的伪三色ＬＥＤ图文显示屏的构成,硬件结构和抗干扰措施。     

Set up of a Screen-Printing Procedure for the Production of a β Alumina-Based Gas Sensor*

A gas sensor based on a -alumina thick film was recently developed on a laboratory scale. This sensor can be successfully used for selective detection of CO and NO_x, resulting from an appropriate choice of the working temperature of the sensing element. This paper deals with the approach of the industrial transfer of the sensor prototype, mainly concerning the scale-up of the screen-printing procedure from a hand-operated apparatus to an industrial production machine. Many parameters were already investigated during the laboratory development, namely the ink composition in terms of organic/inorganic component ratio, the type and amount of the liquid dispersant and rheological agent, the composition and softening temperature of the binder, the -alumina/binder weight ratio. During the industrial transfer, some other parameters must be considered, such as the particle size distribution of the ceramic components of the ink, the influence of the mesh number of the screen fabric on the surface texture of the -alumina film, the viscosity performances of the ink as a function of the applied shear rate and ageing. A common commercial metallic paste was also used as reference for optimizing the characteristics of the -alumina based ink.     

几种纳米加工技术的原理、特点及其应用

从整体上介绍了基于传统半导体加工的纳米加工技术、探针直接书写式纳米加工技术、纳米复制加工技术,以及这几种纳米加工技术的原理、特点及其应用。     

基于DSP的电影洗印自动控制系统

根据国内电影洗印工艺及自动化现状,提出了基于DSP的电影洗印工艺自动化控制系统的设计方案.采用32位DSP芯片TMS320F2812和图形化设计软件LabVIEW实现了数据的实时采集和洗片过程的实时监控,并可以对洗片温度,pH值,电动调节阀开度,片种,流量这几项关键参数进行实时记录和网络传输.现场运行结果表明,系统稳定、可靠、操作方便,大大提高了工作效率.     

导电油墨丝网印刷中应注意的问题

导电油墨种类较多,在电子丝网印刷中应用广泛。本文探讨导电油墨在丝网印刷中应注意的一些问题。     

全彩LED显示屏的节能化设计

全彩色LED大屏幕是一个高能耗的产品。针对LED显示屏的节能问题,对LED显示屏供电系统、供电电源以及控制方法进行了研究及优化,提出了＂LLC谐振＋同步整流的集中-分布式＂电源方案和针对不同LED二极管的＂分类供电＂模式。同时将采用上述方案设计的LED屏供电系统与一般的供电系统进行了对比和计算,得出的结论是：采用本文提出的新型电源方案相对于传统方法,可以节能约20%;若采用文中提出的新型LED供电模式,还将进一步节约15%的能量。因此该显示屏的节能化设计具有重要的社会效益和经济效益。     

基于Modbus协议与MCX314的自动钻孔系统设计

Modbus协议由于其开放性、透明性、成本低、易于开发等优点,在工业领域被广泛使用。MCX314运动控制芯片具有高精度的可控性以及接口简单、编程方便等特点,因此在工业生产中常被用于伺服电机的精确控制。介绍了Modbus串口协议的通信原理以及MCX314运动控制芯片的应用,并结合两者开发出操作简单、控制精确、带有良好人机交互界面的自动钻孔系统,该系统以C8051系列单片机为核心微处理器与上位机通信并对运动芯片进行控制,实现了通过触摸屏对多个钻孔机同时进行操作的一对多控制,并在工业生产中通过测试。     

基于Labview与单片机的LED电子屏幕

目前,LED点阵显示文字图形的控制系统,价格昂贵,功能难以扩展,使用不便。文中对LED电子屏幕的主要控制技术及其应用领域作了简要介绍,针对实际应用需要设计出一种基于Labview与单片机控制的LED电子屏幕。在提出系统整体设计方案基础上详细阐述了由Labview实现UCDOS下字库点阵数据提取方法,并设计出信息编辑与管理系统,论述了LED点阵显示原理及单片机控制系统硬件与软件设计思想。