1150MW核能发电机定子线圈压模五轴数控加工技术

介绍了五轴数控加工技术在岭澳二期1150MW核电机组线圈模具制造中的应用。简要介绍了该机组定子线圈的参数和特殊线圈工艺要求。重点介绍了该机组定子线圈模具的结构特点、传统制造工艺与数控加工工艺方法的区别。指出定子线圈模具数控加工技术在汽轮发电机定子线圈模具的制造中已广泛应用,对产品质量的提升具有显著效果。     

模具新材料的性能和应用

介绍了国内外模具行业中使用的一些用于制造冷作模和塑料模的常用材料和新材料的基本性能及工艺特点;结合实例,介绍了某些国外材料在模具上的应用。     

封闭式电机端盖铸造型模的分体制造工艺

简要介绍了带散热筋封闭式电机端盖型模的分体加工制造工艺,以及普通机床在模具制造上的拓展应用.同时,分析了它在确保端盖模具加工质量的前提下,对提高模具加工精度,提高加工效率,缩短加工时间,降低制造成本上所起的作用.     

微成形模具及其驱动设备的发展现状

随着MEMS的发展越来越多的微型零件被广泛用到各个机电系统领域中。微成形研究除了重视对于微零件成形工艺和材料的研究外,关于制造微零件所需的设备的研究也有了巨大的进展。文章总结了近年来微成形领域中微机加工模具的制造方法和先进技术,涵盖了传统加工和新型的LIGA技术的介绍,比较了各种方法的优缺点并且介绍了微成形模具的驱动设备,包括压电、超磁致伸缩马达和电磁驱动设备。     

微成形模具及其驱动设备的发展现状

随着MEMS的发展越来越多的微型零件被广泛用到各个机电系统领域中.微成形研究除了重视对于微零件成形工艺和材料的研究外,关于制造微零件所需的设备的研究也有了巨大的进展.文章总结了近年来微成形领域中微机加工模具的制造方法和先进技术,涵盖了传统加工和新型的LIGA技术的介绍,比较了各种方法的优缺点并且介绍了微成形模具的驱动设备,包括压电、超磁致伸缩马达和电磁驱动设备.     

快速成形技术在车灯模具制造中的研究与应用

为加快新产品的开发,缩短产品上市时间,降低开发成本,制造技术正经历着一场深刻的变革,这就是从传统的模具制造方法逐步向快速模具制造技术转变.本文重点论述了快速成形技术的特点以及它在汽车灯具制造行业研究与应用的必要性.     

导磁片模具的工艺改进

导磁片是相复励发电机系统的重要部件,过去模具凸凹模采用镶拼结构、钳工装配时精度高,制造周期长。我厂从81年以来相复励发电机的产量逐步增加,导磁片的数量也就不断上升,为此上级领导对我们模具的制造提出了新的更高要求即:a.简化模具制造工艺,缩短模具制造周期,b.提高模具精度,稳定性(可靠性)和模具寿命。为此,我们根据现有的设备对我厂的传统工艺进行改革,获得较好的成效,现把TY15kw导磁片模具新工艺介绍如下:     

叶片热压成型工艺及压模的设计与制造

本文从设计基准、模具型线的确定、定位机构、导向机构等方面,阐述了如何设计混流式水轮机转轮叶片热压成型模具,同时简要地介绍了该类模具的制造工艺。     

提高模具寿命的措施

介绍和分析了模具结构，材料及其制造和使用对模具寿命的影响，提出了一些旨在提高模具使用寿命的探讨性措施。     

汽轮发电机扇形片双胞胎冲模制造技术

本文介绍了12.5万千瓦汽轮发电机定子扇形片双胞胎冲模的工艺设计和制造技术，以及模具在制造过程中常见的质量问题和预防措施。指出采用合理可行的方法对提高模具制造质量和缩短产品制造周期的重要作用。     

磁性微电子机械系统(MMEMS)中的关键问题

磁性微电子机械系统(MMEMS)是在传统的微电子机械系统(MEMS)基础上发展的,它在科学研究及应用领域中有着巨大的潜力.磁性材料和MEMS技术的兼容性问题此前已作为一个重要的问题论述过.本文就磁性MEMS技术中的线圈制作、软磁膜制备及硬磁膜制备等关键性问题加以概述.     

Neue Einbautechniken für Millimeterwellenbauelemente

Übersicht Der Entwurf und die Herstellung von GaAs Millimeterwellen-Modulen zur Leistungserzeugung mit aktiven Zweipol-Bauelementen werden vorgestellt. Anstelle eines konventionellen Einbaus mit Quarzringen und Goldbändern wird das Bauelement monolithisch in eine Struktur aus semiisolierendem GaAs-Substrat integriert. Die Herstellung wird mit Hilfe der Photolacktechnologie vorgenommen, wodurch eine hohe Reproduzierbarkeit der parasitären Reaktanzen erreicht wird. Module mit IMPATT Dioden als aktive Buelemente wurden im Frequenzbereich bis zu 110 GHz mit Erfolg eingesetzt.

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New encapsulation techniques for mm-wave devices

Contents The design and fabrication of GaAs mm-wave modules for power generation using active two-terminal devices are described. Instead of a conventional encapsulation with quartz rings and gold ribbons the devices are monolithically integrated into a structure of semiinsulating GaAs substrate. The fabrication is performed by the help of photoresist technology, wherefrom a high reproducibility of the parasitic reactances is achieved. Modules with IMPATT diodes as active elements are applied successfully up to frequencies of 110 GHz.

     

Design and realization of long-period grating devices inconventional and high birefringence fibers and their novel applicationsas fiber-optic load sensors

We report the design and fabrication of long-period fiber gratings with single and cascaded structures in conventional and high birefringence (hi-bi) fibers using amplitude mask and point-by-point writing techniques. We also report a novel application of long-period gratings produced in nonhigh-birefringence fiber as fiber-optic load sensors exhibiting very high transverse strain sensitivity. Sensitivity some 800 times greater than previously reported fiber Bragg grating (FBG) sensors has been achieved     

Recent advances in high-density and large-scale AWG multi/demultiplexers with higher index-contrast silica-based PLCs

This paper reviews recent progress on high-density and large-scale arrayed-waveguide-grating (AWG) multi/demultiplexers, which have been developed for wavelength division multiplexing (WDM)-based photonic networks. The AWG has been the key to the construction of flexible and large-capacity WDM networks. This is because, compared with conventional filters consisting of thin-film interference filters and microoptics, the AWG offers the advantages of low loss, high port counts, and mass productivity. To improve such characteristics further, low-loss, higher index-contrast (super-high /spl Delta/) planar lightwave circuits (PLCs) with a bending radius of 2 mm have recently been developed. It has been shown that these PLCs are effective for use in constructing a compact AWG module with 1/5 the volume of a conventional module and large-scale AWGs with 256 and 400 channels. Three techniques for low-loss fiber connection with spot-size converters have also been developed for the super-high /spl Delta/ PLCs, and it has been confirmed that these techniques can be applied to the fabrication of AWG modules. Furthermore, two-stage tandem AWG-type multi/demultiplexers with more than 1000 channels have been demonstrated. This paper describes the progress that has been made on these high-density and large-scale AWGs, which are expected to contribute greatly to the construction of future photonic networks including optical add/drop multiplexing systems and optical crossconnect systems.     

Bandwidth extension,linearity enhancement,and cost reduction techniques for continuous‐time channel‐select filters

Achieving a wide bandwidth in a conventional active‐RC filter requires large power consumption and is often accompanied by significant performance degradation. In this paper, a new structure to implement active‐RC continuous‐time filters and also a new frequency compensation scheme for the operational amplifiers that are the main building blocks of active‐RC filters are proposed. Exploiting these techniques increases the maximum possible bandwidth with lower power consumption in comparison with the conventional architectures, reduces die area, and enhances the dynamic range. The effectiveness of these methods has been verified by analysis and simulation of the conventional and proposed filters under identical conditions. Both the analytical investigations and extensive simulation results prove that the adopted techniques improve the performance of continuous‐time filters considerably in terms of bandwidth and linearity while reducing the die area. Simulations have been carried out in a standard 90‐nm CMOS process by using Advanced Design System (ADS), and the proposed filter features 11.08‐dB spurious‐free dynamic range improvement and 5.9 times bandwidth enhancement. Also, the total on‐chip capacitance is made 2.4 times smaller by using the new biquad structure. Copyright © 2016 John Wiley & Sons, Ltd.     

汽轮机叶片模具CAD二次开发与应用

在应用UG软件进行叶片模具设计的基础上,对叶片模具设计过程进行总结归纳,并采用UG软件的二次开发技术,显著提高了叶片新模具的设计效率和设计正确率。     

纳米复合氢氧化镍电极研究

纳米氢氧化镍材料是一种高效的镍电极材料 ,纳米级镍电极的制备方法对镍电极电化学性能的影响很大。研究结果表明 :分散处理的纳米氢氧化镍颗粒制备的镍电极在容量与放电平台方面高于未处理的电极 ;纳米复合镍电极的电化学性能优于纳米镍电极。分散处理的纳米氢氧化镍颗粒组装而成的纳米复合镍电极电化学性能超过了常规球镍电极。纳米颗粒团聚的减轻与纳米颗粒的流动性 ,使纳米复合电极的导电性能与质子传导性能明显改善是分散处理纳米复合镍电极具有优良电化学性能的原因。     

PROTECTION SCHEME FOR EHV TRANSMISSION SYSTEMS WITH THYRISTOR CONTROLLED SERIES COMPENSATION USING RADIAL BASIS FUNCTION NEURAL NETWORKS

ABSTRACT

Since die complex variation of line impedance measured is controlled by thyristors and is accentuated as the capacitor's own protection equipment operates randomly under fault conditions in controllable series compensated transmission systems (CSC), conventional distance protection schemes are limited to certain applications. The authors have extensively addressed the development of new protection techniques for such systems using multilayer percetrons. The basic idea of the method is to design a protection scheme using a neural network approach by catching die feature signals in a certain frequency range under fault conditions. This is different from conventional schemes that are based on deriving implicit mathematical equations based on the infoimation obtained by complex filtering techniques. This paper presents some recent results of employing radial basis function neural networks (RBFN) for this particular application. The use of RBFN is because it has a number of advantages over multilayer percetrons. The study shows that die RBFN based protection works well in CSC systems under a number of system and fault conditions.     

冲切模通用模座工艺研究及应用

电机冲片工艺的推广需要研究制造结构简单、成本低的冲切模具。通过对不同结构冲切模具的实验改进,设计了一种满足生产和成本要求的冲切模具。本冲切模通用模座安装调整操作简单,稳定性好,价格合理,加工周期短。此模座可应用于高压紧凑型电机制造行业中。     

A review on fabrication technologies for the monolithic integrationof tapers with III-V semiconductor devices

The past few years a lot of effort has been put in the development and fabrication of III-V semiconductor waveguiding devices with monolithic integrated mode size converters (tapers). By integrating a taper with a waveguide device, the coupling losses and the packaging cost of OEICs in future fiber-optical networks can be much reduced. This paper gives an overview of different taper designs, the possible fabrication technologies and performances of tapered devices