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本文从同轴度误差的定义出发,简述定位误差所具有的特性。据此说明轴类零件同轴误差即为被测轴线对参考基准的误差。基于这个观点证明对长轴零件采用龙门刨床的工作台面为测量基准和采用小平板改变测量基准来测量同轴度是可行的。 相似文献
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本文阐述了大口径大孔径距同轴度误差测量的基本思想,重点介绍了被测孔轮廓形状的数据。通过AD574a模数转换器和Z-80单板计算机进行传送的采样接口电路。 相似文献
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徐秋松朱祥龙董志刚康仁科张连鑫 《制造技术与机床》2022,(5):84-88
针对非回转体锥形类工件的专用夹具存在定位精度低、换装过程复杂等问题,结合非回转体锥形工件结构形状特征及装夹定位要求,根据六点定位原理设计了定位方案,开展了用于非回转体锥形工件快速装夹定位夹具系统的设计研究.建立了非回转体锥形工件夹具三维模型,对非回转体锥形工件同轴度的调整方法进行探索,分析了径向调整装置对同轴度精度的影... 相似文献
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三坐标测量机是一种近些年发展起来的精密测量仪器,广泛应用于机械、电子和国防等各个领域,是现代机械产品质量控制与检测的重要测量设备。三坐标测量机检测同轴度具有高效率和高精度的特点,然而,在实际测量中,测量方法是影响测量结果的重要因素之一。结合实际情况分析比较了3种测量方法,分别为建立公共轴线法、改测直线度法及增大截面间距离法,指出了每种方法的测量特点及适合的测量环境,并通过实例简单分析了如何选取合适的测量方法,进而说明合理、有针对性的测量方法对获得准确、可靠的测量结果至关重要。 相似文献
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同轴度误差测量方法分析 总被引:1,自引:0,他引:1
详细分析测量同轴度误差的“刃口状V形架测量方法”的原理,明确测量装置读数的规律及特征,指出GB1958-80中有关内容的不足,提出测量同轴度误差的“刃口状V形架测量方法”的正确方法、步骤及计算过程。 相似文献
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在机械制造中,部分台阶轴零件的同轴度,对零件或成品的功能来说是至关重要的。而测量该项误差规定要符合“测量坐标值原则”、“测量特征参数原则”或“控制实效边界原则”,符合这些原则的测量方法有多种,可以根据被测零件的形状、尺寸及精确度要求去选择。但这些方法... 相似文献
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激光跟踪仪测角误差的现场评价 总被引:6,自引:0,他引:6
激光跟踪仪是基于角度传感和测长技术相结合的球坐标测量系统,其长度测量采用激光干涉测长方法,可直接溯源至激光波长,因此,激光跟踪仪的长度测量精度远高于角度测量精度,相对而言,测角误差就成为评价跟踪仪测量精度的重要指标。为了对现场测量激光跟踪仪的测角误差进行快速有效地评价,采用跟踪仪多站位对空间中测量区域内若干个被测点进行测量,与传统基于角度交汇原理的多站位冗余测量不同,利用各站位所观测的高精度测长值建立误差方程,并通过测长方向的矢量位移对跟踪仪测长误差进行约束,获得被测点三维坐标在跟踪仪水平角和垂直角方向上的改正值,以此来评价激光跟踪仪的测角误差。通过Leica激光跟踪仪AT901-LR进行了多站位测角误差评价实验,在现场测量条件下,跟踪仪水平和垂直方向测角误差约为0.003 mm/m(1σ),符合跟踪仪的测量误差特性。 相似文献
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针对研制时栅位移传感器过程中的误差标定环节,常规光栅传感器精度不满足要求的问题,采用激光干涉仪作为误差标定基准,自主研制了基于激光干涉仪的直驱式时栅角位移传感器误差自动标定与修正系统。利用时栅角位移传感器的多测头结构与误差曲线等间距周期性分布的特性,以一个对极的误差曲线重构传感器整周的误差曲线,采用多项式拟合算法构建了时栅角位移传感器的误差修正模型。实验结果表明,误差自动标定与修正系统可以快速、准确地对时栅角位移传感器进行自动误差标定与修正,修正后的时栅角位移传感器的整周误差达到±0.43″。 相似文献
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This paper presents a new error separation method for accurate roundness measurement called the orthogonal mixed method. This method uses the information of one displacement probe and one angle probe to separate roundness error from spindle error. This method was developed from the mixed method, which uses the information of two displacement probes and one angle probe to carry out the error separation. In the present paper, the relationship between the characteristics of the mixed method and the probe arrangement is analyzed. Well-balanced harmonic response of the mixed method is verified to be obtainable for the case where the angular distance between the displacement probe and the angle probe is set at 90°. This orthogonal mixed method also had the simplest probe arrangement, because it requires only one displacement probe and one angle probe to realize the error separation. Optical probes were used to construct an experimental measurement system that employs the orthogonal mixed method. The displacement probe and the angle probe both use the principle of the critical angle method of total reflection, and they have stabilities of 1 nm and 0.01 in., respectively. The measurement results show that roundness measurement can be performed with a repeatability on the order of several nanometers. 相似文献
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《Measurement》2014
High precision 3D profile rotary measuring systems for large diameter workpieces are urgently needed in precision engineering. Error separation is critical for improving the accuracy of the system. In order to obtain higher accuracy for 3D profile rotary measuring systems, the random and systematic errors are analyzed and separated in this paper. In the measuring system, roll and pitch caused by the probe tilt violate the Abbe principle. Roll is removed by using two probes and pitch is separated by the interferometer method. The radial run-out and the perpendicularity error between the probe and the spindle axis are compensated by a two-probe-two-step method carried out on a standard hemisphere artifact. As the form error of the artifact is mixed with the perpendicularity error, the least-squares method is applied to fit the hemisphere and work out the perpendicularity error and the profile error of the hemisphere. Finally, numerical validation is presented using Matlab program to demonstrate the effectiveness and correctness of the proposed method. 相似文献
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