An Order-oriented Procedure Model for A Robust and Agile Production System

The manufacturing industry in 1990's is faced with se-vere challenge among the global competition for mar-kets.Production for a small quantity and high varietyeven lot-sizes of one-digit numbers products has be-come a main trend today.Traditional production proce-dure limits the flexibility of the production system.Inthis paper,based on the analysis of the procedure charac-teristics,a design strategy for re-usage of informationand resource is introduced,and an order-oriented pro-cedure model with concurrent,hierarchical and micro-cycle structure for a robust and agile production systemis proposed in order to realize flexible and adaptive pro-duction for dynamically-changing orders.     

A fast muon trigger for the PHENIX forward spectrometer upgrade

The PHENIX forward upgrade adds nosecone calorimeters and level-1 trigger (LVL-1) detectors to the muon forward spectrometers. The muon detector will trigger on high pT muons from W decay and reject background. This will enable study of quark and anti-quark polarizations in the proton. The upgrade will add momentum and timing information to the present muon trigger. Signals from 3 Resistive Plate Chambers (RPCs) will provide momentum and timing information for the LVL-1 trigger. Each RPC carries a plane with coarse structure to establish a space point for timing and one with radial cathode strips for azimuthal resolution. Timing resolution of ≈ 2 ns rejects beam-related backgrounds and tracking from RPCs minimizes muons from hadron decays. RPC information is sent by optical. bers to LVL-1 trigger processors. A discussion of physics measurements possible, layout of the upgrade and details of RPC design and tests are given below. for the PHENIX collaboration Presented in the Poster Session “Future Experiments and Facilities” at the 18th International Conference “Quark Matter 2005”, Budapest, Hungary, 4–9 August 2005.     

粒子制造系统的智能结构及其应用

介绍粒子制造系统的基本概念，研究传统制造系统和粒子制造系统的根本区别，并提出了粒子制造系统的智能结构模式，给出了此模式在机械加工系统中的应用案例.最后，指出了粒子制造系统的发展方向.     

Numerical simulation of the transient multiphase field during plasma deposition manufacturing composite materials

A solid/liquid/gas unified model has been developed to investigate the gradient composition formation during the plasma deposition manufacturing (PDM) composite materials process. In this model, an enthalpy porosity model was applied to deal with the melting and solidification of the deposited layer, and a level-set approach was introduced to track the evolution of the free surface of the molten pool and the deposited layer. Moreover, complicated physical phenomena occurring at the liquid/gas interface, including forced convection heat loss, heat emission and plasma heat source, have been incorporated into the governing equations by source terms. In this study, the numerical experiment of nickel base alloy powder deposited on the medium steel substrate by PDM technique was implemented based on the staggered grid and SIMPLEC algorithm. Concentration gradient distribution of the solute material at the composite material interface, fluid flow and temperature distribution in the molten pool and the deposited layer have been investigated in detail. Supported by the National Natural Science Foundation of China (Grant No. 50474053) and the High Technology Research and Development Program of China (Grant No. 2007AA04Z142)     

Laser rapid manufacturing of Colmonoy-6 components

This paper introduces a new manufacturing technique for the fabrication of Colmonoy-6 components using laser rapid manufacturing (LRM). LRM is a upcoming rapid manufacturing technology, being developed at various laboratories around the world. It is similar to laser cladding at the process level with different end applications. In general, laser cladding technique is used to deposit material on the substrate either to improve the surface properties or to refurbish the worn out parts, while LRM is capable of near net shaping the components by layer-by-layer deposition of the material directly from CAD model. In the present study, a high power continuous wave (CW) CO₂ laser system, integrated with a co-axial powder-feeding system and three-axis workstation was used. The effect of processing parameters during multi-layer deposition of Colmonoy-6 has been studied and optimized to fabricate about a dozen bushes. Thus fabricated bushes were finally machined and ground to achieve the desired dimensions and surface finish. These bushes were tested for non-destructive testing (like-ultrasonic testing, Dye-penetrant testing), metallographic examinations, micro-hardness measurement, X-ray diffraction and thermal ageing. Results compared well with those fabricated by deposition of Colmonoy-6 on austenitic stainless steel rods using gas Tungsten arc welding (GTAW). Thus, the new manufacturing technique not only produced quality product, but also minimized machining of hard-faced material and brought significant saving of time and costly Colmonoy-6 material.     

关于利用外资促进福建产业结构升级的若干问题

利用外资是福建经济具有有活力和潜力的经济增长点。本文分析了福建利用外商直接投资的现状及其对福建产业结构变动的影响 ,在此基础上 ,提出了要进一步优化外商投资环境以吸引更多的外资 ,同时 ,又要加强外商投资的产业引导 ,从而更好地推动产业结构的升级     

Exploration and Understanding of Manufacturing Networks:From Manufacturing Centres Towards Global Inter-firm Relationships

The boundaries of manufacturing system have been ex te nded from factory to the international manufacturing network, supply network, va lue network and virtual network in recent decades, driven by intensified competi tion, fragmented market, globalised collaboration, and advanced technology. However, as the manufacturing system evolves into more and more complicated net work relationship, the fundamental concepts of manufacturing strategy focusing o n a product family and bridging its market, competitio...     

基于I—HTML＋语言及协议的企业制造资源信息网的实现

动态联盟是敏捷制造的关键技术之一，为了构造企业制造资源信息网络，对ＨＴＭＬ和ＨＴＴＰ协议进行了扩充和修改。着重介绍对ＨＴＭＬ有ＨＴＴＰ协议扩充，修改的原则和基于Ｉ－ＨＴＭＬ＋语言的及协议的动态联盟结构。     

制造网格中可参数化服务的匹配问题

针对制造网格中,通过部分可参数化服务的匹配来实现虚拟企业组建的问题,采用Petri网进行此类服务匹配的过程建模,并对匹配问题中的服务和请求作了形式化的描述,建立了此类服务匹配问题的一个数学模型。在此模型的基础上提出了服务匹配算法,进行不同匹配等级下的匹配规则设计,满足企业盟主不同的服务请求。仿真结果表明,该算法在解决可参数化服务的匹配问题时是可行的。