铸造镍基合金切削加工

铸造镍基高温合金Ｋ４１８是一种难加工材料，为解决某厂增压器蜗轮轴的切削难题，作者采用多种刀具材料，对Ｋ４１８材料作了大量的切削试验。结果表明，在本试验条件下硬质合金刀具ＹＤ１５、ＹＧ８９１３切削效果最佳；陶瓷与ＣＢＮ刀具的韧性不足，边界磨损十分严重．     

石墨材料高速切削加工的研究现状

介绍了各向同性石墨材料的制备工艺、性能特点及应用场合,综合评述了高速切削加工石墨材料的切削机理、刀具磨损、工艺参数和冷却方式的研究现状,对高速加工石墨的常用刀具进行了性能分析与比较。     

γ-TiAl合金切削加工研究进展

γ-TiAl合金具有密度低、比强度高、抗蠕变和抗氧化性能良好等特性,在航空航天及汽车领域具有广泛的应用前景.切削加工作为金属零部件成形工艺中主要的材料去除方式,是制造γ-TiAl合金零部件的重要方法.为研究γ-TiAl合金的可加工性,改善零部件使役性能,国内外学者针对材料性能和加工工艺展开了大量的研究工作.本文在概述γ...     

精密切削加工切削模型

本文从切削表面形成的机理出发,分析了精密切削过程中切削作用力的变化规律,建立了精密切削加工新的切削模型,得到了切削力与各主要参数的关系式及切削方程式,探明了精密切削加工机理。     

钛合金在数控车床上的切削加工

钛合金因其性能的优越性,在航空、航天、石油、化工、汽车等工业生产领域得到了广泛应用,但在数控加工钛合金过程中,存在切削效率低下,刀具耐磨性差,切屑排屑困难等加工难题。为此,笔者通过反复研     

切削加工技术的发展趋势

随着激烈市场竞争和以机械制造技术为先导的先进制造技术以前所未有的速度和广度向前发展,使得高生产率和高质量成为先进制造技术追求的两大目标.论述了干式切削、高速切削、低温切削、超精密切削、硬切削以及切削仿真等加工技术,这些切削加工技术是当前切削技术的重要发展方向,也必将成为切削加工的主流技术.     

钛合金高速切削加工试验研究进展

钛合金因优越的性能而被广泛应用于航空航天和武器装备等领域,但由于切削加工性较差,在高速切削中易出现切削力大、切削温度高和刀具磨损严重等问题,因此,学者们针对钛合金高速切削加工进行了大量试验研究.本文对近年来钛合金高速切削领域的国内外研究进展进行了总结,重点分析了在锯齿形切屑、切削力、切削温度、加工表面质量和刀具磨损方面...     

对切削加工性能的影响

为分析过共晶铝硅合金组织对其切削加工性能的影响,对两种化学成分相同但是组织结构不同的过共晶铝硅合金进行了切削试验研究并探讨了其切削机理.试验结果表明:过共晶铝硅合金经变质处理后组织中初晶硅的大小、形状和分布状况对切削刀具寿命和合金的切削加工表面质量影响极大,具有细小、分散而形状圆钝化初晶硅的合金有比较好的切削性能.造成这种影响的主要原因在于细小的硅粒比较容易协同基体塑性变形和被刀具压入切屑和已加工表面,而粗大的硅块往往发生解理破碎、脱落和位移,直接与刀具发生强烈摩擦并使已加工表面存留许多缺陷.     

GH761切削加工性能试验研究

通过对航空发动机涡轮盘的新型高温合金材料GH761的切削加工性能试验研究,建立了在一定条件下的切削力,切削温度的预报方程,并在实验的基础上对两种高温合金材料GH761与GH135进行对比,评定和探讨了GH761的切削加工性能及其改善措施,为现场的实际生产提供了一定的参考依据。     

BAM1020颗粒物检测仪在空气自动监测中的常见故障排除

BAM1020颗粒物检测仪在空气自动监测中得到广泛运用,对其工作原理、校准以及使用过程中常出现的故障进行阐述。     

简易低成本电缆故障检测仪

在研究了常用电缆模型和检测理论的基础上,针对目前市场上电缆检测设备的复杂、昂贵等不足,提出了一种基于SOPC的时频域联合分析（TFDR）的电缆故障检测方案,实现了基于SOPC技术的简易低成本电缆故障检测仪的设计,同时满足了检测的精度要求.     

基于自适应免疫检测器的变速器轴承故障诊断研究

针对变速器轴承振动信号不平稳、特征难以提取等问题,以对振动信号的幅值和频率的变化不敏感的5种无量纲参数为特征参数,将这5种特征参数分为自我模式和非我模式,并基于人工免疫原理设计了一种自适应免疫检测器米克服传统变速器轴承故障诊断方法的局限,重新定义了自适应变异和抑制阈。在变速器轴承实验台上,首先对变速器轴承6种状态下的振动加速度信息进行了测量;然后计算了这些振动信息的无量纲指标;再用所得到的5种无量纲特征参数训练免疫检测器,使之成为成熟检测器;最后采用训练好的成熟检测器对变速器轴承的故障状态进行了诊断。试验结果表明：利用自适应免疫检测器进行变速器轴承故障诊断是可行的,而且该检测器具有较强的故障识别能力。     

ARL9900X射线荧光光谱仪SC探测器故障处理

赛默飞世尔ARL9900X射线荧光光谱仪日常分析时,会出现TFe元素无成分,其它元素成分正常的现象.本文解析了X射线荧光光谱仪的工作原理,运用角度扫描和能量描迹的方法进行故障分析,确定SC探测器故障,并进行更换处理,再结合SC探测器工作原理及结构,对故障产生原因进行了探讨,总结使用维护经验.     

Web-based remote monitoring and fault diagnosis system

This paper proposes an approved Web-based multilayer distributed software architecture solution for remote monitoring and fault diagnosis. To tightly integrate legacy monitor systems, a component framework model based on COM has been proposed, which is very suitable for remote monitoring and fault diagnosis applications. This system has the potential for exchanging a data acquisition system by using wrapper service components. A mixed thick Web client architecture is proposed to implement real-time remote monitoring. A Web-based remote monitoring and fault diagnosis system is developed by using modeling technology, Web application technology, component technology and VME extension for instrumentation (VXI) bus technology, which publishes a fault diagnosis algorithm package, a basic monitoring package and an advanced analysis package on the Internet. This system provides authorized users with an effective and instant way to access new monitoring and diagnosis component packages in time. This paper gives researchers a paradigm to accomplish similar systems. The technique developed may be used for other fields, such as power engineering, manufacture and transportation system.     

基于ARM的工程机械液压系统故障检测仪的设计

针对工程机械流动性大、液压检测与分析能力有限、液压系统复杂等实际情况,设计了一种基于WINCE和ARM嵌入式系统的便携式液压检测仪.该检测仪以ARM11类型处理器S3C6410A为核心,构建了工程机械液压系统常见故障推理软件系统和液压系统状态检测系统,实现了现场故障分析与推理、设备状态检测等高级功能.     

Compact cosmic ray detector for unattended atmospheric ionization monitoring

Two vertical cosmic ray telescopes for atmospheric cosmic ray ionization event detection are compared. Counter A, designed for low power remote use, was deployed in the Welsh mountains; its event rate increased with altitude as expected from atmospheric cosmic ray absorption. Independently, Counter B's event rate was found to vary with incoming particle acceptance angle. Simultaneous co-located comparison of both telescopes exposed to atmospheric ionization showed a linear relationship between their event rates.     

Coolant system health monitoring and fault diagnosis via health parameters and fault dictionary

A new methodology is described for the condition monitoring and fault diagnosis of machine tool coolant systems. The steady state characteristics of the coolant system pump outlet pressure, pump motor temperature and tank level are used to define health parameters from which the system health is deduced. On detection of a significant change in system health the pressure transient on closure of the flow valve is captured to aid diagnosis of the fault. A demonstration system for the coolant system of a Wadkin V4-6 machine tool is described. This is used to verify the usefulness of the health system described above by simulation of a number of typical faults.     

网络故障监控系统设计探讨

基于整个网络以及其中的某些关键网络单元的有效测试验证,已经成为电信领域研究的一个重要方面。本文主要从系统的开发、测试软硬件环境,系统的软件体系结构,监控网络结构,数据库设计等方面描述本文的监控系统的概要设计,对于今后网络故障监控系统设计发展具有一定帮助。     

SOA-based remote condition monitoring and fault diagnosis system

This paper describes the development of the service-oriented architecture (SOA)-based Remote Condition Monitoring and Fault Diagnosis System in the field of equipments remote monitoring and fault diagnosis. The architecture is based on Web Services, Smart Client, and Extensible Markup Language (XML) technologies etc. More specifically, the paper analyzes the structures and the requirements in equipments remote monitoring and fault diagnosis. Finally, the SOA-based Enterprise Monitoring and Fault Diagnosis System has been developed and realized with Visual Studio 2005, which has been applied to industrial field. It verifies the effectiveness and practicality of the system.