基于数字和智能化的变电站安全工器具管理模式研究

提出了一种“ 321 ”的数字化管理模式,即在运维站、应急车辆和变电站 3 种方式的安全工器具存放管理。在运维站驻地开发了一套智能化的安全工器具集中管理系统和数字化的台账系统,用于集中管理和调配安全工器具;在应急车辆中安装车载工器具存放箱,存放应急操作用的工具;在变电站及设备区设置安全标识牌、安全围栏网存放箱和登高爬梯就地存放管理。将个体防护装备、绝缘安全工器具和应急安全工器具进行了分类保存管理,便于运维人员就地取用,节省了人力,降低成本,极大地提高了工作效率和安全性。     

我国数控机床使用率低的原因分析与对策

分析了目前数控机床用户在数控机床的管理、使用等环节中存在的问题及数控机床使用率低的原因，介绍了用户科学用好数控机床的有效措施。     

数控机床的合理使用与科学管理

分析了目前数控机床用户在数控机床的管理、使用等环节中存在的问题及数控机床使用率低的原因；介绍了用户科学用好数控机床的有效措施。     

A review of recent developments in the design of special-purpose machine tools with a view to identification of solutions for portable in situ machining systems

With the ever increasing diversity of manufacturing and maintenance needs for modern products, the realm of machine tool design has expanded considerably in recent years. While machine tools for producing singular parts are widely documented, there is much less information available about machine tools for specialist tasks such as repair and maintenance. The paper aims to give an overview of the developments in the field of specialist machine tools and machining systems with a particular emphasis on maintenance operations and in situ machining. The difficulties of performing maintenance on large-scale systems are outlined along with the potential benefits of in situ machining in these applications. A number of examples of specialist machines for applications in various fields are described. The developing area of micro machine tools and micro factories is introduced along with examples of systems which have been developed or proposed. The possible advantages and draw-backs of the various technologies described are discussed. The paper goes on to comment on the potential for a new approach which combines these technologies to produce small in situ machine tools for performing macro-scale machining operations on large workpieces. These machining systems could offer increased versatility of in situ maintenance machining, compared to machines designed for a single repair operation, while reducing costs and environmental impacts.     

知识管理工具

知识管理对于企业提高技术创新能力具有重要的意义。对知识管理的各种工具进行总结和阐述；讨论了知识管理的概念模型，将知识管理分为9个过程；依照这个概念模型，对各种知识管理工具进行分类和价格。分析结果表明，现有知识管理工具存在功能不完整、集成性不高、协同性不够以及可重构性差等几点不足。     

Direct Selective Laser Sintering of Hard Metal Powders: Experimental Study and Simulation

Direct selective laser sintering (SLS) technology can be used to produce 3D hard metal functional parts from commercial available powders. Unlike conventional sintering, it does not require dedicated tools, such as dies. Hence, total production time and cost can be reduced. The large shape freedom offered by such a process makes the use of, for example, sintered carbides components viable in domains where they were not applied before. Successful results have been obtained in the production of sintered carbide or hard metal parts through SLS. The investigation focuses on tungsten carbide–cobalt (WC-Co) powder mixture. This material is characterised by its high mechanical properties and its high wear resistance and is widely used in the field of cutting tools. This paper is devoted to the experimental study and the simulation of direct selective laser sintering of WC-Co hard metal powders.     

The performance of TiN-coated high speed steel tool inserts in turning

While it is well known that thin, hard coatings can reduce tool wear and improve tool life and productivity, there is still little consensus over the degree of advantage coated tools have over their uncoated counterparts. This paper compares the behaviour of titanium nitride- (TiN-) coated and uncoated high speed steel (HSS) tool inserts during turning. Wear maps describing the crater wear characteristics of these tools are used to show that the extent of tool wear reduction due to the coatings depends strongly on the cutting speed and feed rate. The maps also demonstrate that the benefits of TiN coatings on HSS tools may be easily realized over a wide range of machining conditions.     

协作学习过程中的知识积累与共享

目前,对计算机支持的协作学习中交互工具的研究比较多,而对其过程中产生的知识利用的研究却很少.本文在分析了协作学习中知识管理的需求后,基于本体方法,提出了在协作学习过程中使用本体完成知识的获取、加工直至使用的方法,并进行了实验验证.     

Job scheduling and management of wearing tools with stochastic tool lifetimes

The problem of scheduling jobs using wearing tools is studied. Tool wearing is assumed to be stochastic and the jobs are processed in one machining centre provided with a limited capacity tool magazine. The aim is to minimize the expected average completion time of the jobs by choosing their processing order and tool management decisions wisely. All jobs are available at the beginning of the planning period. This kind of situation is met in production planning of CNC-machines. Previous studies concerning this problem have either assumed deterministic wearing for the tools or omitted the wearing completely. In our formulation of the problem, tool wearing is stochastic and the problem becomes very hard to solve analytically. A heuristic based on genetic algorithms is therefore given for the joint problem of job scheduling and tool management. The algorithm searches the most beneficial job sequence when the tool management decisions are made by a removal rule taking into account the future planned usage of the tools. The cost of each job sequence is evaluated by simulating the job processing. Empirical tests with heuristics indicate that by taking the stochastic information into account, one can reduce the average job processing time considerably.     

An Integrated Maintenance Management System for an Advanced Manufacturing Company

Maintenance costs in advanced manufacturing companies, e.g. electronics manufacturing companies, have been steadily increasing as the companies upgrade their production facilities. Maintenance costs are normally a considerable portion of the product cost. To maintain a competitive place in the market, it is critical for an advanced manufacturing company to have a sound maintenance management system, which can control its maintenance costs at the lowest level and maintain its overall equipment effectiveness at the highest level. This paper reports on an integrated maintenance management system, which has been developed and implemented in an advanced electronics manufacturing company in Hong Kong. The methods and principles of the system are discussed in sections on maintenance performance auditing, cost recording and tracing, reliability centred maintenance planning and control, condition monitoring and on-line feedback control, and integrated maintenance planning and control.     

试论数控机床常见故障及维修处理

近年来,数控机床在我国制造业中的应用日益普遍,由于其价格较高,在生产制造中是至关重要的一部分内容,因此,一旦该环节出现问题,不但会造成生产的停滞,还会导致企业经济效益的缩水,品牌口碑也会因此下滑,由此可见,数控起床在企业生产所发挥的重要作用。然而,在企业生产管理中,重数控机床应用中功能发挥,轻维修养护的管理问题突出,极大地影响着机床运转安全。基于此,本文将对数控机床常见故障及维修处理相关问题进行深入研究。     

浅谈Lotus notes邮件系统的管理与维护

从Lotusnotes服务器端的管理维护、notes客户端的维护应用技巧、数据的备份与恢复、常见故障的分析与处理等四方面进行讨论,提出监控Domino服务器的重要性;给出做好服务器硬盘空间管理的两种方法：邮箱限额和数据库压缩;归纳出客户端使用中的应用维护技巧;明确指出数据的备份很重要,并给出备份与恢复方法;最后对一些常见故障进行分析,揭示故障背后的原因。     

也谈数控机床的使用、管理与日常维护保养

数控机床的使用、管理与日常维护保养,成为困惑小型、个体企业,职业教育培训学校这些用户的主要问题。根据加工对象和工艺范围,正确合理使用数控机床,配置必要的附件和刀具,针对数控机床的特点,逐步制定相应的管理制度。注重数控机床的日常维护保养,建立一支高素质的维修队伍以适应设备维修的需要。     

Experimental analysis of change detection algorithms for multitooth machine tool fault detection

This paper describes an industrial application of fault diagnosis method for a multitooth machine tool. Different statistical approaches have been used to detect and diagnose insert breakage in multitooth tools based on the analysis of electrical power consumption of the tool drives. Great effort has been made to obtain a robust method, able to avoid any needed re-calibration process, after, for example, a maintenance operation. From the point of view of maintenance costs, these multitooth tools are the most critical part of the machine tools used for mass production in the car industry. These tools integrate different kinds of machining operations and cutting conditions.     

An Infrastructure for Integrated Automation System Implementation

Evolution of advanced manufacturing technologies and the new manufacturing paradigm has enriched the computer integrated manufacturing (CIM) methodology. The new advances have put more demands for CIM integration technology and associated supporting tools. One of these demands is to provide CIM systems with better software architecture, more flexible integration mechanisms, and powerful support platforms. In this paper, we present an integrating infrastructure for CIM implementation in manufacturing enterprises to form an integrated automation system. A research prototype of an integrating infrastructure has been developed for the development, integration, and operation of integrated CIM system. It is based on the client/server structure and employs object-oriented and agent technology. System openness, scalability, and maintenance are ensured by conforming to international standards and by using effective system design software and management tools.     

教学用数控机床的管理与维修

从教学机床与生产机床的工作特点方面、从管理和维修方面,指出了教学数控机床使用过程中存在的问题,并分析其原因,提出了改进措施。     

Surface Integrity and Machineability in Intermittent Hard Turning

Despite the large amount of research on hard turning, there are few results on intermittent hard turning. In this paper, the feasibility of internal intermittent hard turning has been investigated. First, the cutting tools with different cubic boron nitride (CBN) contents were evaluated, based on machineability: tool wear, surface roughness, and cutting forces. In the case of intermittent turning, low CBN content tools had better machineability than high CBN content tools. The depth of the machining damaged layer and the magnitude and distribution of residual stress were evaluated. The experimental results showed that intermittent hard turning can produce surface integrity which is good enough for replacing the grinding process.     

石材锯切机理与金刚石工具磨损机理的研究现状

对金刚石工具切割石材等硬脆材料时的锯切机理、锯切过程中金刚石工具的磨损机理以及锯切力的国内外研究现状及各种观点进行了综合评述。由于石材等硬脆材料锯切过程的复杂性 ,对锯切机理的认识迄今尚不统一 ,对金刚石工具磨损机理和锯切力的理论研究也亟待深入。     

数控机床可用度分析

数控机床的使用过程是在故障与维修交替作用下进行的,假设从系统使用开始已发生N次故障时,则进行预防性维修;而当已发生故障次数小于N时,则仅作事后小修(修复性维修)。根据某型号数控机床1年的25个故障数据,首先采用统计方法对故障数据进行趋势检验,然后通过参数估计与线性相关检验确定数控机床故障过程符合威布尔过程模型。在此基础上,确定其平均可用度模型。     

配置FANUC-0iD系统的数控机床的调试

数控机床是高度机电一体化的产品,随着他在我国制造业的普及使用,了解其控制原理、安装调试过程及故障维修方法显得日趋重要.以FANUC-0iD系统数控机床的调试为例,介绍了配置FANUC-0iD系统的数控机床的一般调试步骤,同时也说明了数控加工中心各功能动作的实现过程.