共查询到20条相似文献,搜索用时 15 毫秒
1.
CMM touch trigger probes testing using a reference axis 总被引:3,自引:1,他引:2
A new method of testing of touch trigger probes for coordinate measuring machines (CMM) has been proposed. The concept is based on measurements of the distance between reference and triggering points in various directions. The reference points are established by the rotation axis of a precise rotary table. The advantage of this method relies on easy realisation with application of a commercial device for roundness error measurement. The accuracy of the presented method is much higher in comparison with the existing procedures of CMM probes calibration.The mathematical principle of the method has been presented and used for evaluation of its uncertainty. The validity of the method was experimentally confirmed by means of one- and two-stage type probes. 相似文献
2.
Influence of the measured objects parameters on coordinate measuring machine (CMM) touch trigger probe inaccuracy of probing is investigated. Factors such as material stiffness of measured workpiece, its surface shape and roughness are taken into consideration. The measuring method out off CMM, based on a rotary table and a reference axis is applied for tests. The concept is based on measurements of the distance between reference and triggering points in various directions. The reference points are established by the rotation of a precise rotary table. The statistical analysis of variance and regression is applied for data analysis. 相似文献
3.
The use of CMM in industrial environments requires a surveillance of their state of quality. The implementation of the procedure which allows to ensure the quality of the measurement is often left to the user’s initiative, which is powerless in the face of the complexity of the problem. We are interested in a new type of deviation that we call microdefects. We propose indicators which characterize the microdefects. These indicators are intended to point out metrological failure of CMM axes. We propose indicators that will assess the procedure adapted to a use of CMM in an industrial environment within an integrated CMM global survey system. After an introduction of the microdefects we are interested in, we describe the quality indicators we have defined and the procedure chosen to evaluate them. We conclude with the perspective for these indicators. 相似文献
4.
Y.-J. Lin P. Murugappan 《The International Journal of Advanced Manufacturing Technology》2000,16(2):107-112
The recent developments in computer integrated manufacturing (CIM) systems have made the traditional dimensional inspections
bottlenecks in the production line. To overcome these bottlenecks, computer integrated dimensional inspection was proposed
with the coordinate measuring machine (CMM) being the key device. In this investigation, a framework for integrating manufacturing
(CAD/CAM) environment is developed to automate the process of design, manufacturing and inspection. An algorithm to generate
an optimum collision-free CMM probe path is proposed. This algorithm uses the ray tracing technique to locate the collision
of the possible paths with the workpiece to be inspected, between the initial probe point and the target point. If there is
a collision, the algorithm walks through the topological structure of the part and selects the midpoint of the edge shared
by the face with which the path collides and the adjacent face nearest to the target point, as the next probe point. This
procedure is followed until the target point is reached. The first half of the proposed algorithm is implemented using Mechanical
Desktop as the CAD system and AutoCAD Runtime Extension (ARX) as the application programming interface, running on a Windows
NT 4.0 platform. The effectiveness of the proposed algorithm is verified by the results of the implementation which demonstrate
optimum collision-free dimensional inspection path generation for three prismatic parts. 相似文献
5.
E.S. Lee M. Burdekin 《The International Journal of Advanced Manufacturing Technology》2001,17(7):508-515
To measure the volumetric error of coordinate measuring machines (CMMs), a hole-plate artifact method was studied. Example
designs of the hole-plate are shown using titanium and ceramic materials. The deflection by its own weight of the designed
hole-plate is analysed using the finite element method. The hole distances moved by the deflection are shown in different
hole-plate set-up cases, for vertical and horizontal positions. The influence of inside hole roundness as a measuring standard
is also studied. Eccentric errors for different hole roundness are simulated. The hole-plate set-up errors are also discussed.
A method for obtaining the parametric errors of a CMM is shown using the hole-plate as a measuring artifact for CMM positioning
error. In addition, a method for measuring 2D and 3D length errors using the hole-plate data is introduced. 相似文献
6.
Metrological feasibilities of CMM touch trigger probes. Part I: 3D theoretical model of probe pretravel 总被引:1,自引:0,他引:1
New 3D model of the inaccuracy of a touch trigger probe used to collect coordinates of a measured object by coordinate measuring machine (CMM) is proposed. The analysis is performed both for one and two stage types of probes. The influence of a stylus length and diameter, a spring force and direction of a contact point approach are taken into consideration. The effects of frictional interaction between the stylus ball and a measured surface are also taken into consideration. The theoretical analysis of a tough trigger probe hysteresis is presented. Finally a computer simulation of mathematical modeling in the XYZ space is shown. 相似文献
7.
Error compensation for CMM touch trigger probes 总被引:3,自引:0,他引:3
W. Tyler Estler S. D. Phillips B. Borchardt T. Hopp C. Witzgall M. Levenson K. Eberhardt M. McClain Y. Shen X. Zhang 《Precision Engineering》1996,19(2-3):85-97
8.
9.
面向三坐标测量机应用的检测特征自动提取和识别 总被引:2,自引:0,他引:2
为了解决三坐标测量机(CMM)中手工输入检测信息的问题,提出了自动提取和识别检测特征的方案。应用特征技术,实现了基于CAD模型公差特征的自动提取。利用CAD模型中几何要素标识唯一的特点,建立了STEP和QDAS中性文件的匹配,解决了几何信息和检测信息在CAD和CMM之间的传递和识别问题。在Unigraphics上进行了二次开发,使其能自动输出匹配好的STEP和QDAS文件,并能被CMM软件识别和应用。 相似文献
10.
针对传统坐标测量机和关节臂测量机存在的技术局限,基于3-PSS并联机构原理,提出了只需一只长光栅、一条精密导轨即可实现三维空间精密测量的坐标测量机,并研究了测量系统的测量模型、测量误差模型及并联机构误差平均效应.根据并联机构基本理论建立了测量机的六杆测量模型,在此基础上进行了杆长制造、装配误差和光栅读数误差的理论分析.然后,从理论上展示和说明了并联机构存在误差平均效应的数学本质和依据.最后,介绍了样机的设计及制造,并给出初步的实验结果.在没有进行误差修正和系统标定的前提下,该样机在X,Y,Z3个坐标方向上的测量误差分别为0.029 mm,0.045 mm和0.058 mm.得到的结果可指导新样机的优化设计. 相似文献
11.
12.
13.
14.
15.
三坐标机测量齿轮齿廓的不确定度评价 总被引:3,自引:2,他引:3
介绍了坐标测量中几种常用的不确定度评价方法.指出传统的三坐标测量机的测量不确定度评价方法大都不适用于评价坐标测量中面向对象的测量不确定度,并对使用蒙特卡洛方法评价测量不确定度进行了研究.首先,根据三坐标测量机详细标定文件及补偿策略说明建立测量模型.然后,将测量中的采样点通过测量模型生成大量测量结果,并以此评价测量不确定度.在齿廓评价实验中,评定齿廓误差的测量不确定度为0.96 μm时,多次评价结果之间的最大差值不超过0.03 μm,具有可靠的理论依据和较稳定的评定结果.文章指出,目前商用三坐标测量机大都不能为特定的测量对象提供测量不确定度报告,使用蒙特卡洛方法有希望改变此现状. 相似文献
16.
测量形状误差是精密制造业质量控制的关键部分。坐标测量机(CMM)是自动化精确测量维度尺寸和几何形状的机器。本文选用两种类型的坐标测量机触发探针进行标准工件测量,旨在研究不同的每转波数(UPR)时不可预见的动态固有误差的影响。整个实验过程使用探针类型和探针速度参数,采用快速傅立叶变换分析实验结果,得到受CMM机械结构和探针扫描速度影响而可预见的几何误差。实验结果表明,UPR的数量在进行圆形测量时对CMM准确度水平起非常重要的作用。本文对探针系统和坐标测量机结构响应的具体误差公式也进行了假设与分析,以经验数据来预测PRISMO-Bridge-CMM在NIS中的准确度。 相似文献
17.
This paper presents an optimised method for the characterization of circular features of any amplitude, which includes the capture of geometric data, by means of the use of three-coordinate measuring machine or digital optical machines with a CCD camera, and its subsequent mathematical processing. The proposed model determines the radius and the circularity error, based on the minimum zone method, and to this end it uses linear programming techniques, the Simplex programming principles and the limaçon approximation. An experimental study on ring gauges and reference disks is provided, including a comparative analysis using the Chauvenet and Grubbs filtering procedures. Last of all, an uncertainty estimation method is proposed by means of the Monte Carlo simulation. The experimental analysis carried out on ring gauges and reference disks accredit that the algorithm developed, implemented in a Matlab® environment, gives reliable results for any circumference arc considered, regardless of its amplitude. 相似文献
18.
19.
介绍了Isara 400 3维超精坐标测量机标定的关键技术,包括平台标定和系统镜面台非垂直度标定.同时,提出了一种新的超精接触探针系统,给出了这种3维灵敏度探针的标定结果. 相似文献
20.
Quasi-stiffness model is effective for the compensation of the geometric errors of coordinates measuring machines (CMMs) in slow probing, but degrade the error compensation accuracy due to the generation of dynamic errors in fast probing. It is usually regarded that acceleration is the major origin of dynamic errors; and yet the dynamic effects that rise from the quick fluctuation of geometric errors in fast probing had attracted little attentions. This paper presents a model for the dynamic effects of the geometric errors of CMMs in fast probing, and investigates their properties with experiments. The error model is built with recursive least squares (RLS) identification technique by taking probing acceleration and the 6 geometric errors of X slideway for the inputs while the positioning error of probe tip for output. Then the positioning error of probe tip is decomposed into 7 components corresponding to the 7 inputs. Analyses on the experiments show that the angular errors around Y and Z axes, εY(x) and εZ(x), can induce remarkable dynamic effects, especially in a CMM with low stiffness air bearing. Error compensation with RLS identification seems feasible theoretically, but it is not recommendable due to the veracity uncertainty of identification. Nevertheless smoothening the sharp corners of the curves of geometric errors, especially εY ∼ x and εZ ∼ x, in terms of probing speed and Y coordinates of probe tip is considered as a simple but effective and reliable method to improve the accuracy of CMMs errors compensation in fast probing. 相似文献