微波非金属厚度测量仪

迄今,测厚仪有射线、超声、涡流和同位素等各种类型,新近发展了微波测厚仪,它既有测量金属片材、带材的厚度仪,又有测量非金属材料的厚度仪。根据非金属材料微波测厚法基本原理〔1〕研制的微波测厚仪补充了超声波测厚仪之不足,为非金属材料厚度的测量提供了新方法。利用微波测厚具有设备简单、测量速度快,对样品能进行非破坏性相对测量,不需要耦合剂等优点。经过仪器校正和在标准试件上标定后,可以用于绝对厚度的测量。     

同面多电极电容传感器的仿真与试验研究

针对非金属材料表面下异常或损伤的检测,提出一个同面8电极电容传感器。采用二维有限元法对该传感器的电势分布、灵敏度分布、电容测量及材料内部发生异常改变时的电容变化进行了仿真计算,用一种工程塑料作为样本,对同面多电级电容传感器用于检测非金属材料表面下的损伤或异常的可行性和有效性进行了试验研究。用主元分析方法对仿真计算的电容值和实测的电容值进行了异常识别,主元分析方法能很好地识别出非金属材料表面下的异常或损伤。仿真和初步的试验结果表明,当非金属材料表面下发生异常变化或损伤时,与材料的健康状态相比,测得的电容值减小了;用同面多电极电容传感器能有效的检测出非金属材料表面下的异常或损伤,该方法可用于实际的非金属材料表面下异常检测和健康状态监测。     

非金属材料表面粗糙度非接触测量试验研究

基于白光技术研究聚酰亚胺、F3和F46等3种非金属材料表面粗糙度的测量方法。分别利用基于白光共焦技术设计的粗糙度轮廓仪和基于白光干涉技术设计的三维形貌测量仪对三种不同材料的试件进行测量试验,重点关注上述3种非金属材料的吸光程度对测量精度的影响,并以触针式接触测量法的测量结果为参考,对测量结果进行不确定度评定。试验数据的分析结果表明,白光共焦法的测量不确定度为9.2%,白光干涉法的测量不确定度为9.8%,这2种基于白光技术的测量方法都是可行的。     

WIDIA刀片改善铝材料及非金属材料的铣削

WIDIA Victory M1200面铣刀成功地广泛应用于各类机加工领域,其专为铝加工而设计的新型WIDIA刀片在粗、中、精加工中性能表现优异,该新刀片也可用于加工其它非金属材料。结合WIDIA Victory M1200面铣刀的使用,目前可提供两种不同的槽型,可以使加工铝或其它非金属材料的工厂大大受益。     

ESD模拟器电流校验研究

通过分析ＥＳＤ模拟器的校验原理,介绍了一种符合国际电工委员会ＩＥＣ０００－４－２标准的ＥＳＤ模拟器电流校验系统。该系统由电流探头、同轴电缆与衰减器、数字存储示波器和法拉第笼组成,能自动采集ＥＳＤ电流波形,计算上升时间、峰值电流、３０ｎｓ电流、６０ｎｓ电流等参数。测量数据以ＥＸＣＥＬ或位图格式存入软盘,供微机分析结果并打印校验报告。测量结果变异系数小于３％。除用于ＥＳＤ模拟器校验,该装置还可广泛用于其它形式静电放电电流测量和静电放电机理研究。     

铠装热电偶在有色金属液测温中应用

在有色金属熔铸过程中,温度的控制要依靠测量手段,在用热电偶测量时存在着金属制的护套易腐蚀,非金属材料护套易断裂,用光学测温存在着误差较大等问题。为克服上述矛盾,我们试制了铝装热电偶金属熔液测温计。结构如图1。     

ISCAR推出可调节式高速铣刀（HSM）

ISCAR新推出可调节式高速铣刀（HSM）立铣刀和面铣刀，可用于加工铝、非金属材料、铸铁、淬硬钢等，特别推荐应用于汽车工业及航空航天工业。     

伊斯卡推出夹持PCD/CBN刀片的高转速可调式动平衡铣刀F90LN

<正>新型可调刀夹式面铣刀,主要夹持钎焊PCD或PCBN刀片,用于加工铸铁、淬硬钢、铝或其他非金属材料。经动平衡处理的铣刀可用于高转速加工,带特别设计的冷却喷孔,冷却液呈放射状喷射而出,带走切屑,使其远离切削区域。该铣刀推荐用于汽车和航空工业。     

现代汽车用非金属材料发展趋势

本文概述了现代汽车用非金属材料的类别 ,通过对现代汽车用典型非金属材料选择和应用状况的分析 ,阐述了汽车非金属材料在汽车材料发展中越来越重要的地位。     

新型不锈钢隔离膜压力传感器

世界领先的硅微机械加工压力、加速度传感器制造商———美国ＥＧ＆ＧＩＣＳｅｎｓｏｒｓ日前宣布了一款新系列压力传感器,设计用于腐蚀性介质的压力测量。采用新型芯片和制造工艺,使得该系列压力传感器性能指标充分提高而且成本更低。关键特性●改善的线性：±０．１％...     

万能激光测长机测量非标长量块的不确定度分析

万能激光测长机是一种可以进行绝对测量和相对测量的长度计量仪器，用途非常广泛.量块检定一般采用比较法测量，对于非标准长量块的测量现在可以利用万能激光测长机进行测量。介绍了用万能激光测长机测量非标准长量块的方法，并对其不确定度进行了详细分析。     

一种扫描式铸轧板带凸度检测方法

根据铸轧工艺的特点,文章提出了一种扫描式铸轧板带凸度检测的方法,即采用双束激光差动扫描测量板带的厚度分布,从而计算出板带的凸度。文章设计了激光板凸度检测装置,现场应用表明,系统可以满足铸轧板凸度检测与控制的要求,具有成本低、精度高等特点。     

System for automatic gauge block length measurement optimized for secondary length metrology

This paper presents a contactless system for automatic gauge blocks calibration based on combination of laser interferometry and low-coherence interferometry. In the presented system, the contactless measurement of the absolute gauge block length is done as a single-step operation without any change in optical setup during the measurement. The optical setup is combined with compact gauge block changer with a capacity of 126-ga blocks, which makes the resulting system fully automatic.The paper also presents in detail a set of optimization steps which have been done in order to transform the original experimental setup into the automatic system which meets secondary length metrology requirements. To prove the measurement traceability, we conducted a set of gauge block length measurement comparing data from the optimized system and the established reference systems TESA NPL A.G.I. 300 and TESA–UPC operated in Czech Metrology Institute Laboratory.     

光学三角-电涡流复合传感器

利用电涡流效应和光学三角测量原理,研制出光学三角－电涡流复合传感器,主要应用于对涂覆在金属体上的非金属层厚度的测量。并且能够满足工业自动检测中高精度和非接触测量要求,同时测量范围和精度可随不同的应用要求而进行大范围的调整。讨论了该传感器工业领域中的一种实际应用;测量金属圆柱体表面非金属涂层的偏心。     

Compact and inexpensive iodine-stabilized diode laser system with an output at 531 nm for gauge block interferometers

A compact and inexpensive iodine-stabilized diode laser system with an output at 531 nm has been applied to long gauge block measurements. Although the optical frequency of the output beam was widely modulated (modulation width of ∼22 MHz), the coherence length and interference phase stability are sufficiently long and high, respectively, for the interferometric measurement of long gauge blocks of up to 1000 mm in length. The effective uncertainty of laser frequency in the interferometric measurement was theoretically and experimentally confirmed to be less than 10⁻⁹.     

进一步法测量端面长度标准中条纹图的自动处理技术研究

介绍利用激光干涉与数字图像处理技术以及应用 FFT分析干涉条纹方法分析并解决测量端面长度标准中条纹图的处理技术 ,应用这种方法不但提高了测试过程的自动化程度 ,而且大大地提高了测量结果的精度。文中给出了最典型的端面长度标准量块的干涉条纹小数部分的实测结果     

非金属硬脆材料加工技术的最新进展

综述了近年国内外非金属硬脆材料加工技术的发展和最新研究成果,主要包括在传统磨削技术基础上发展起来的先进磨削技术,加热、超声和摩擦化学反应等辅助能量加工技术,以及激光、等离子、电火花、磨料水射流等高能束加工技术,展望了超精密加工技术的发展前景,旨在为促进我国的非金属硬脆材料优质、高效、低成本加工技术的快速发展提供借鉴。     

The statistical gauge in geometrical verification: Part I. Field of probability of the presence of matter

Currently, most measurement and geometrical verification processes are based on the characterization of distances or angles between geometrical elements. In a previous paper, a method was developed for the verification of ISO specifications using the statistical information included in a set of points. This method is based on the development of measurement sequences and hence a sequence of geometrical constructions. The main problem in this verification process is to propagate uncertainties. With a correct expression of a virtual gauge, it is possible to avoid this propagation; indeed by using virtual gauge manipulation, initial best-fitted surfaces are never touched. The aim of this paper is to present a new approach using this statistical information to describe the measured part and develop a virtual gauge system for verification. This will be done in two parts. The first part will focus on the statistical modelling of the measured surface; the second part will describe a verification method based on a virtual, i.e. numerical, gauge.     

Development of computer aided calibration module for CMMs and machine tools using a compensated step gauge

This paper shows a micro computer aided error calibration system for CMMs and machine tools, which is a fast and efficient error calibration system: A micro computer stores the error calibration data of a step gauge which were precalibrated with more precise equipments such as laser interferometer, then the step gauge is probed with the specific CMMs or machine tools. The probing data are compared with the stored precalibration data, in order to give the linear displacement accuracy of the machines. High degree of computer integration has been performed in the measurement path planning, measurement operation, and error evaluation. Thus a rigorous computer aided error calibration system has been implemented with full potential of practical application to most of commercial CMMs and machine tools of CNC type.     

The statistical gauge in geometrical verification. Part II. The virtual gauge and verification process

Currently, most measurement and geometrical verification processes are based on the characterization of distances or angles between geometrical elements. Methods have already been developed for the verification of ISO specifications using the statistical information included in a set of points. These methods are however based on the development of measurement sequences and hence a set of geometrical constructions. The main problem in this verification process is the propagation of uncertainties. With a correct expression of a virtual gauge, it is possible to avoid this propagation; indeed by using a virtual gauge manipulation, initial best-fitted surfaces are never altered. The aim of this paper is to present a new approach using this statistical information to describe the measured part and develop a virtual gauge system for verification. This has been done in two parts. The first one focused on the statistical modeling of the measured surface; this second part will now describe a verification method based on a virtual, i.e. numerical, gauge.