质量标注定量包装商品净含量计量检验时测量设备的选择

本文以质量标注类的商品为例分析在进行净含量检验时,从影响称量结果的各种因素考虑,为了满足最后扩展不确定度不应超过O.2T的要求,测量设备应如何选择。     

数控设备对复杂曲面进行测量与数学建模的研究

介绍如何利用数控设备进行复杂曲面测量及数据处理。着重介绍测头的选择、测量系统的构成。对数控机床附加测量功能的研究具有一定的指导意义。     

零件型面测量方法研究

介绍了如何利用粗糙度仪器,通过设计制作专用定位工装(夹具)、进行测头选择及匹配实验、进行测量不确定度分析等,开展零件几何型面测量的一种方法.     

直流电位差计测量结果不确定度的评定及表示方法

详细介绍直流电位差计测量结果不确定度的分析过程,如何建立数学模型、如何进行A类评定、如何进行B类评定、如何进行不确定度的合成、如何计算自由度、如何选择置信因子、如何报告结果、并给出了应用实例,对此类不确定度的评定有一定的指导作用。     

圆度、圆柱度和同轴度的测量原理及数据处理的解析方法

在形位公差国标的贯彻中,形位误差的精确测量是一项很重要的工作。目前,测量圆度的仪器主要有圆度仪,而测量圆柱度和同轴度还没有专用的测量设备,配有电子计算机进行数据处理的也很少见。本文的目的是提供一种圆度、圆柱度和同轴度的测量原理和用于电子计算机的线性数据处理的解析方法为设计新的专用测量设备用的。这样,与通用测量设备相比可以进一步提高测量的精度和效率。由于圆度测量及数据处理是上述三种项目测量的基础,因此本文以圆度的测量及数据处理的解析方法作为重点加以介绍,同时对被测零件的安装精度提出了要求。     

发动机气缸体缸孔圆柱度三坐标测量方案

针对日常生产过程中圆度仪测量发动机缸孔圆柱度出现的问题,探索三坐标测量缸孔圆柱度的正确方法。从三坐标机型的选择、测头的配置、采样策略的规划、滤波参数的选择及测量方案的设计等五个方面进行了实践、验证比较与误差分析,得出科学的缸孔圆柱度的三坐标测量方法,并应用于公司的新型发动机铝合金缸体缸孔圆柱度的测量。     

质量比较仪在砝码检定中的应用

质量比较仪是砝码检定的主要配套设备,但是如何选择合适的质量比较仪相当重要。本文依据JJF 1326-2011 《质量比较仪校准规范》,介绍质量比较仪测量不确定度的评定过程,同时以JJG 99-2006 《砝码》检定规程为依据,对质量比较仪的适应范围进行讨论,确保质量比较仪可正确进行质量量值传递。     

大跨距轴承座同轴度测量及安装方法

介绍了大跨距轴承座同轴度测量及安装方法。详细阐述了所需设备、测量原理和具体操作步骤。采用该方法很好地解决了高精度、大跨距轴承座同轴度的测量及安装。该方法操作简便,尤其适用于轴承座直径较大且轴承座间距较大(大于2500mm)的轴孔同轴度测量及安装。     

噪声测量中如何正确选择噪声发生器

本文介绍了噪声测量中如何正确选择噪声发生器,使测量不确定度减小的方法,在实际工作中能够提高噪声测量准确度。     

基于三维测量的物体细小特征位置度误差分析

简单介绍了三维测量技术的发展现状、测量方法及各自的优缺点,分析了实际测量中位置度误差产生的原因。借助FARO关节臂三维测量设备,采用接触式和非接触式两种方法测量易变形工件局部细小特征的位置度,并对结果进行比较分析,得出两种方法各自的优缺点,总结出该类零件特征的测量方法。     

计算机控制的圆度测量仪

介绍一种基于计算机控制的圆度测量仪 ,该测量仪由测量工作台、位移传感器、ADLINKPCI91 1 4HG数据采集卡、计算机以及控制和误差评定软件组成 ,论述该仪器的软、硬件组成和工作原理 ,并提出在圆度测量中引入虚拟仪器的概念。     

A method for evaluation of elliptical profiles

Measurement and evaluation of circular profiles of cylindrical components in terms of circularity has been well established using roundness measuring instruments. For elliptical sections having very little difference between the major and minor diameters this difference can be measured with the roudness measuring instrument. However, fitting of the best fit ellipse and hence the definition of ellipticity are not available. Applications of elliptical profiles include instruments, such as the photospectrometer developed at CMTI with accurate elliptical cams, elliptical gear blanks, and the pistons of internal combustion engines whose cross sections are elliptical. In this paper a method for the evaluation of the elliptical profiles for centre and orientation of major and minor axes is described and two concepts for defining ellipticity are discussed     

虚拟仪器控件在圆柱体直径和形位误差测量中的应用

直径和形位误差是圆柱体零件的重要技术指标,通常用圆柱度仪或圆度仪测量并经数据处理后得到。在圆柱体直径和形位误差测量中需进行参数设置和图形显示,编程工作量较大。将虚拟仪器中的控件应用于用VB语言编制的程序,则可节省大量编程时间,使程序界面更美观,实现用鼠标拖动图像及从不同视角观察图像。本文根据所选虚拟仪器控件特点,介绍了CWUI3.0.1控件组在测量方法、评定参数设置以及CW3DGraph3.5控件在圆柱度误差评定结果显示中的应用。     

用虚拟仪器改造YD200A型圆度仪

对传统的YD200A型圆度仪进行了虚拟改造的可行性分析,给出了基于PCI总线的虚拟仪器系统的软硬件构成。用设计的虚拟仪器对轴的圆度误差进行了实际测量,结果表明与传统的仪器及其测量方法、数据处理方式相比,虚拟仪器构建非常容易,还实现了检测过程的自动化、数字化、智能化及可视化,大幅度提高了测量速度、数据处理速度及测量精度。     

一种圆度仪辅助测量工装的设计

转台式圆度仪是一种用于测量圆度、圆柱度、同轴度等参数的仪器。传统的使用圆度仪测量半径的方法由于操作繁琐、定位精度低,已不适用于大批量生产检测。提出了一种新的测量工装,具有结构简单、使用方便等特点。实践证明,使用新的工装辅助圆度仪进行内孔半径的测试,可以对工件进行较精确的定位,充分发挥圆度仪的精准性,有效避免了因定位误差导致需要重新调整工件位置的困扰,显著提高测量定位精度及工作效率。     

Evaluation of the form errors of axisymmetric components

The form errors of three-dimensional surfaces have an effect on the proper functioning of an assembly. Methods for evaluating form errors of surfaces of spherical and cylindrical components are available. However, in most machines and instruments the functional components are axisymmetric, e.g. spindles, and have varying geometry in the form of steps, tapers etc. Evaluation of the form errors at different zones on the component as well as a form error characteristic of the whole component is required in such cases. To do this coordinate data or circularity traces are obtained at different horizontal sections using a coordinate measuring machine or a roundness measuring instrument respectively and the required form error is then evaluated. Different algorithms developed for fitting the axis of the component which is the first step in the evaluation of form errors are described. The method of normal least-squares fitting was found to be superior to the general least-squares method.     

Traceability and correlation in roundness measurement

A new method for the calibration of Flick standards for roundness measuring instruments has been developed through the use of a Form Talysurf stylus instrument. The method incorporates circular fits and the convolution of the standardized probe geometry over the fitted arcs using the “Kilroy's Cat” function. The method yields stable results, and an error budget documents the low uncertainty of the method. Major uncertainty contributors are the traceability of the Form Talysurf and the roughness of the Flick standard. It is shown that the tip radius has a significant effect on the results obtained in roundness measurement, even on such simple artifacts as the Flick standard. This underlines the importance of implementing a standardized tip radius. The influence of Gaussian versus 2RC filters is also documented.     

Y9025Ⅲ型圆度测量仪电气改造

针对原Y9025Ⅲ型圆度测量仪采用的分立电气元件老化、故障多、结构复杂、显像图形不直观等问题，取消分立元件，改用集成电路、电脑控制、应用软件编制工作程序等方法，使改造后的圆度测量仪具有结构简单、操作方便、数据准确可靠、工作效率高、寿命长、图形直观、可随时存储和打印等优点。     

INTELLIGENT VIRTUAL CONTROL:MEASURING INSTRUMENT FROM WHOLE TO PART

A new concept called intelligent virtual control (IVC), which can be driven by measuring functions, is put forward. This small "intelligent measurement instrument unit (IMIU)", carrying with functions of instrument, consists of different types of intelligent virtual instrument (IVI) through individual components together as building blocks and can be displayed directly on the computer screen. This is a new concept of measuring instrument, and also an important breakthrough after virtual instrument (VI). Virtual control makes instrument resources obtain further exploitation. It brings about a fundamental change to the design and manufacturing mode. The instrument therefore, can not only be produced directly inside a PC, but the product is involved in the "green product" system. So far, all the present digital instruments will grow to be replaced by intelligent control with green characteristics.