印刷机滚筒的模态分析

印刷机滚筒的结构和动态性能对印刷机工作特性有很大影响,为提高印刷机的印刷质量,以纸箱印刷机滚筒为研究对象,在已有优化设计的基础上,利用ANSYS有限元分析软件,对优化前后的纸箱印刷机滚筒进行了模态分析,得到了印刷机滚筒的固有频率和振型,从动态特性上为静态优化结果提供了支持。     

集成电路板锡膏印刷机现场总线控制系统应用

论文分析了锡膏印刷机的控制系统机构,并通过对比常规DCS控制系统,研究了基于CAN总线的锡膏印刷机FCS控制系统。与传统的锡膏印刷机控制结构相比,CAN总线锡膏印刷机的控制系统机构减少了硬件配线,易于系统的模块化实现和故障诊断。CAN总线在保证锡膏印刷机系统可靠性的同时,提高了系统精度,降低了成本,具有重要的应用价值。     

我国凹版印刷机的现状及发展方向

介绍了在包装印刷领域应用非常广泛的国产凹版印刷机的生产和使用现状,与国外凹印机的差距,同时分析了国内凹印刷机生产厂家今后的努力方向和前景.     

参数化设计方法在印刷机设计中的应用研究

介绍了参数化设计的概念、方法及参数化设计系统的功能，从印刷机的设计现状入手，分析了参数化设计方法在印刷机设计中应用的必要性和可行性，对参数化设计方法在印刷机设计及其它行业的应用作了展望。     

当前包装印刷工业的发展趋势和面临的任务

根据当前印刷工业的发展趋势和面临的任务重点可以在以下几个方面进行突破。1.数字印刷及印刷数字化技术装备(1)数字印刷机,重点是喷墨数字印刷机目前,数字印刷机主要分静电成像数字印刷机和喷墨数字印刷机两大类。当前,我国数字印刷企业的主流设备是静电成像数字印刷机,但由于在幅面、承印物等方面的优势,喷墨数字印刷机发展潜力较大。目前我国尚不具备生产静电成像数字印刷机的能力,主要产品全部依靠进口,喷墨数字印刷机的研发则已经起步,具有较好的发展基础。     

印刷机设备状态监测与故障诊断研究进展

通过对国内外印刷机状态监测与故障诊断研究情况和发展趋势的分析,认为当前对印刷机监测的研究主要集中在振动信号的测试研究、专家经验知识的应用、模式识别算法引入等几个方面,并论述了当前基于印刷图像处理的印刷机故障诊断这一新方向的研究情况。由于印刷机不断朝着高速度、高精度、高自动化程度方向发展,传统故障诊断方法在印刷机系统中的应用已受到很大限制,研究认为,兼顾多元信息实现全面状态监测,融合经验知识与先进识别算法建立故障决策体系,从印刷画面信息中提取设备参数,将是今后印刷机故障诊断研究的重点。     

数字印刷的发展与市场

文章对数字印刷机的特点进行了分析，从概念上讨论了数字印刷与直接制版差别和使用范围，通过对数字印刷机特性的分析和印刷成本的分析，说明了数字印刷的发展趋势、市场定位，并对几种典型的黑白和彩色数字印刷机的主要用途进行了介绍。     

虚拟仪器与传感器融合在齿轮监测中的应用研究

目的研究印刷机齿轮在高速印刷时的振动状况。方法借助Labview软件为平台开发印刷机齿轮振动在线检测仿真系统,并结合虚拟仪器和传感器融合技术,研究印刷机的振动状况。结果通过仿真系统得出原始齿轮振动信号中的啮合频率受转频2倍频(23.6Hz)和3倍频(34.69Hz)调制。结论虚拟仪器与传感器信息融合技术可以监测到印刷机在高速印刷时的振动状况,并通过相关特征波形提取分析,实时检测到齿轮磨损、断齿故障。     

无轴传动在印刷机中的应用

阐述了无轴传动技术的定义、特点及在平版印刷机、柔性版印刷机、凹版印刷机中的应用,以及在大型多功能印刷设备中的应用,使得传动更为安全稳定,传动精度高.同时还使传动系统结构简单,便于维修、安装和调试.无轴传动技术在印刷机的应用,使得印刷机在高速运转时更加平稳,从而提高印刷品的质量.     

关注“十二五”期间印刷工业的发展趋势和面临的任务

一、重点发展产品 根据当前印刷工业的发展趋势和面临的任务,“十二五”期间,印刷机械行业要重点在以下几个方面进行突破: 1.数字印刷及印刷数字化技术装备 (1)数字印刷机,重点是喷墨数字印刷机 目前,数字印刷机主要分静电成像数字印刷机和喷墨数字印刷机两大类.当前,我国数字印刷企业的主流设备是静电成像数字印刷机,但由于在幅面、承印物等方面的优势,喷墨数字印刷机发展潜力较大.目前我国尚不具备生产静电成像数字印刷机的能力,主要产品全部依靠进口,喷墨数字印刷机的研发则已经起步,具有较好的发展基础,北大方正等企业已经能够生产喷墨数字印刷机.“十二五”期间,印刷装备制造行业要加大数字印刷机,尤其是喷墨数字印刷机的研发力度,研发具有自主知识产权的系列化喷墨数字印刷机,2015年主要设备达到当前的国际先进水平;关键部件研发取得突破,打破进口产品的龚断局面.     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.     

Early ironwork in Biscay: Survey,excavation, experimentation and materials characterization. An integral study of the mountainside ironworks (ferrerías de monte or “haizeolak”)

ABSTRACT

The production of iron in Biscay (Basque Country, Spain) has been a hallmark of this territory of the North of the Iberian Peninsula throughout its history. The Archaeology team of the Basque Country Mining Museum has spent 13 years, so far, studying the origins of this activity through the evidences left at the old pre-hydraulic iron production workshops known as mountainside ironworks (ferrerías de monte) or haizeolak. It has catalogued 170 archaeometallurgical sites of this type in Biscay, and the archeological excavation of some of them has led to the knowledge of the different stages of the production process that took place in these workshops. The team has also experimentally reproduced the work carried out in a mountainside ironworks from the High Middle Ages, and it has currently started the characterization process of this type of activity through the study of the collected materials.