共查询到19条相似文献,搜索用时 46 毫秒
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三坐标测量机在高速测量时,由于附加惯性力的影响,引起机体变形,从而导致动态误差.对三坐标测量机动态误差进行了理论分析,在加速、匀速、减速三种状态下,利用有限元方法对横梁沿Z方向进行了受力变形分析,推导出此三种载荷下动态误差补偿模型,并由此得出了任意载荷作用下的误差补偿模型,提高了三坐标测量机的测量精度. 相似文献
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三坐标测量机动态误差与测球半径补偿误差的研究 总被引:1,自引:0,他引:1
分析了影响给定的三坐标测量机动态误差的因素,对动态偏转角误差进行了测量,并推导出由动态偏转误差得到测头处的动态位移误差的方法,同时分析了测球半径补偿误差的成因及解决措施。 相似文献
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本文主要对坐标测量机上形位误差的检测方法进行了介绍。指出了只有最小条件法才是符合ISO标准的形位误差评定方法。 相似文献
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三坐标测量机作为一种高精度测量仪器,在生产、制造等众多领域得到了广泛的应用,三坐标测量机的重要性越发显现出来。然而三坐标测量机也是一种机床,在不断的应用过程中也会有精度的衰减,这样就需要对其精度进行必要的补偿,才能保证测量设备的稳定可靠才能为生产、制造提供有效保障。实验证明经过误差补偿的测量机检测精度会显著提高。本文总结了基于Quindos系统的三坐标测量机几何精度误差补偿技术,详细描述了三坐标测量机线性误差的补偿方法。 相似文献
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三坐标测量机非刚性误差的分析与补偿 总被引:3,自引:0,他引:3
根据移动桥式三坐标测量机非刚性效应测量误差的分布特征 ,通过对坐标测量机构件进行受力变形分析与建模 ,对坐标测量机的非刚性效应测量误差进行了分析 ,为高精度坐标测量机的误差补偿技术提供了新的思路 相似文献
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Geometric error measurement and compensation for the rotary table of five-axis machine tool with double ballbar 总被引:2,自引:1,他引:1
Yi Zhang Jianguo Yang Kun Zhang 《The International Journal of Advanced Manufacturing Technology》2013,65(1-4):275-281
This paper proposes a novel measuring method for geometric error identification of the rotary table on five-axis machine tools by using double ballbar (DBB) as the measuring instrument. This measuring method greatly simplifies the measurement setup, for only a DBB system and a height-adjustable fixture are needed to evaluate simultaneously five errors including one axial error, two radial errors, and two tilt errors caused by the rotary table. Two DBB-measuring paths are designed in different horizontal planes so as to decouple the linear and angular errors. The theoretical measuring patterns caused by different errors are simulated on the basis of the error model. Finally, the proposed method is applied to a vertical five-axis machining center for error measurement and compensation. The experimental results show that this measuring method is quite convenient and effective to identify geometric errors caused by the rotary table on five-axis machine tools. 相似文献
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G. S. Chen X. S. Mei H. L. Li 《The International Journal of Advanced Manufacturing Technology》2013,69(9-12):2583-2592
Synthesis modeling of a geometric error-based traditional method for large-scale grinding machine tools with six axes is too complicated to perform in a real-time compensator with a built-in position control system, and it is difficult to obtain all of the error elements corresponding to the model. This paper proposed a novel strategy in which a machine may be considered as translation axes and rotary axes, and geometric errors of the translation axes and rotary axis are modeled and the geometric error models of the machine are very simple for real-time error compensation. The volumetric errors of the translation axes are measured using spatial circular curve ball bar test, and every element of the rotary axis is also obtained by a series of considerate ball bar tests. According to the characteristics of a position controller used in the machine, a synthesis error compensation system based on the NUM numerical control system was developed. Error compensation experiments were carried out, and the results show that the accuracy of the machine is improved significantly. 相似文献
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用于多传感器坐标测量机探测误差评价的薄环规标准器 总被引:1,自引:0,他引:1
设计了一种薄环规标准器,用于配有光学影像测头和接触式测头的多传感器坐标测量机的探测误差评价。该标准器兼有环规和二维平面标准圆的特征,孔的有效部分厚度为0.1 mm,圆度为0.5μm,可以满足大多数坐标测量机的校准需求,避免了普通标准器如标准球、环规对影像测头测量成像的影响。该标准器同时适用于接触式测头测量,锥孔结构保证了标准器的稳定性,用于接触式测量时,不会引起变形。利用设计的薄环规标准器实现了配有光学影像测头和接触式测头组合测量系统的探测误差评价,结果表明该标准器有效解决了上述组合系统探测误差的校准问题。参照ISO10360-9标准,给出了多传感器组合测量系统的探测误差、尺寸测量误差以及位置误差,并利用坐标变换方法修正了位置误差,优化了系统参数。 相似文献
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针对如何减小齿轮测量中心的几何结构误差从而提高测量精度,以多体系统拓扑结构分析理论为基础,计及测量中心自身的27项几何结构误差参数和运动误差参数,推导出齿轮精密测量方程式和理想测量方程式,为齿轮测量结果的误差补偿和仿真分析作了必要准备. 相似文献
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Geometric error compensation software system for CNC machine tools based on NC program reconstructing 总被引:4,自引:3,他引:1
Gangwei Cui Yong Lu Jianguang Li Dong Gao Yingxue Yao 《The International Journal of Advanced Manufacturing Technology》2012,63(1-4):169-180
It has been proved that error compensation is an effective approach to improve machining accuracy of a machine tool cost efficiently. In this paper, the framework of an error compensation software system, which can realize software error compensation via numerical control (NC) programs reconstructing, is investigated. And the algorithms relating to error prediction are discussed in detail, such as positioning movement error compensation, linear interpolation movement, and circular interpolation movement error compensation. To realize the error compensation, NC program is reconstructed according to the predicted errors during virtual machining before it is fed to the actual machining. Two controlled machining experiments were carried out. The results show that error compensation methods via reconstructing NC programs can improve the movement accuracy of a computer numerical control CNC machine tool obviously. 相似文献
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Automated measurement and compensation of thermally induced error maps in machine tools 总被引:1,自引:0,他引:1
In this paper, a direct method of machine tool calibration is adopted to model and predict thermally induced errors in machine tools. This method uses a laser ball bar (LBB) as the calibration instrument and is implemented on a two-axis computerized numerical control turning center (CNC). Rather than individually measuring the parametric errors to build the error model of the machine, the total positioning errors at the cutting tool and spindle thermal drifts are rapidly measured using the LBB within the same experimental setup. Unlike conventional approaches, the spindle thermal drifts are derived from the true spindle position and orientation measured by the LBB. A neural network is used to build a machine model in an incremental fashion by correlating the measured errors with temperature gradients of the various heat sources during a regular thermal duty cycle. The machine model developed by the neural network is further tested using random thermal duty cycles. The performance of the system is also evaluated through cutting tests under various thermal conditions. A substantial improvement in the overall accuracy was obtained. 相似文献
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一种利用坐标测量机实现圆度误差评价的方法 总被引:4,自引:2,他引:4
针对直角坐标系下圆周截面形状误差评价,介绍了一种圆柱体截面圆度误差的测量与评定方法.在研究了圆度误差定义及测量方法的基础上,建立了基于三坐标测量机的最小外接圆圆度误差三维评测模型.利用双截面最小二乘拟合轴线调整坐标系位置,减少了位姿误差对测量结果的影响.对模型进行坐标系统一转换,使得变换后的模型能更适用于计算机数据处理.然后在坐标变换的前提下,提出了一种利用几何关系搜索最小外接圆圆心的方法,开发了相应的数据分析软件.实验和数据证明,此算法优于传统最小外接圆算法,实现了在直角坐标系下三坐标测量机对圆度误差的最小外接圆法评价. 相似文献