Four-station laser tracer-based geometric error measurement of rotary table

Zha, Jun; Li, Linhui; Han, Lin-Hai; Chen, Yaolong

doi:10.1088/1361-6501/ab64ab

Cited by 15 publications

(8 citation statements)

References 20 publications

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“…A reasonable choice for the positions of the four laser tracers can reduce the influence of the layout on the geometric error measurement results. Combined with the multi-point positioning measurement algorithm [9], the derivation of the position dilution of precision (PDOP) and the best layout of laser tracers are presented as follows.…”

Section: Layout Of the Laser Tracersmentioning

confidence: 99%

“…The multi-station laser tracer has high accuracy, time-saving features, multiple geometric error items, and large measurement space range characteristics [7,8]. Zha et al successfully applied the four-station laser tracer in the geometric error item measurement of a computerized numerical control (CNC) rotary table and found the tool to be effective and efficient, ensuring measurement accuracy [9].…”

Section: Introductionmentioning

confidence: 99%

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Influencing factors of rotary table geometric error measurement using four-station laser tracers

Zha¹

2021

Meas. Sci. Technol.

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The laser tracer multi-station measurement method has outstanding performance in computerized numerical control (CNC) rotary table geometric error measurement and separation. However, external factors, such as layout, selected distance between the target mirror and measurement coordinate system, uncertainty of the length measurement, selection of measuring radii for the rotary table, and installation deviation from the target mirror center to the rotary table surface, have negative effects on the results. In this research, the position dilution of precision in the global positioning system measurement process is introduced to evaluate the influence of the laser tracers’ positions on measurement errors. The optimal measurement layout of the laser tracer is used to select the distance between the target mirror and XY plane of the laser tracer measurement coordinate system for the simulation. Then, the influence of the length measurement uncertainty on the laser tracer self-calibration and point measurement results used for calibration is examined based on the Monte Carlo simulation method. Different measurement radii in the rotary table are selected, and four-station laser tracers are used to perform the virtual measurement and evaluate the maximum uncertainty in the X, Y, and Z directions to further determine the best measurement radii of the CNC rotary table. Finally, the effects of the deviation of the target mirror installation center on the geometric error items of the CNC rotary table are quantitatively examined through a simulation. The analysis of the influencing factors in the geometric error measurement and separation process of the CNC rotary table can help further understand how the final results are formed, so as to control the influencing factors during the measurement process and finally optimize them in practice.

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Section: Layout Of the Laser Tracersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influencing factors of rotary table geometric error measurement using four-station laser tracers

Zha¹

2021

Meas. Sci. Technol.

Self Cite

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“…The proposed geometric error modeling method can also be applied to other types of parallel mechanisms. Zha et al [10] modeled the geometric errors of the NC rotary table using the screw theory, and a three-point measurement method was proposed to realize the separation of these geometric errors. Chen et al [11] used motion-axis differential operators to calculate the differential transformation matrix of each motion axis, and summed them to obtain the integrated error transformation matrix of the machine.…”

Section: Introductionmentioning

confidence: 99%

A Geometric Accuracy Error Analysis Method for Turn-Milling Combined NC Machine Tool

Zhao

Luo

2020

Symmetry

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Turn-Milling Combined NC machine tool is different from traditional machine tools in structure and process realization. As an important means in the design stage, the analysis method of geometric accuracy error is also different from the traditional method. The actual errors and the error compensation values are a pair of "symmetry" data sets which are connected by the movement of machine tools. The authors try to make them more consistent through this work. The geometric error terms were firstly determined by topological structure analysis, then based on homogeneous coordinate transformation and multibody system theory, the geometric error model was established. With the interval theory, the function rule of sensitivity of geometric error sources to spatial errors was analyzed in detail, and the global maximum interval sensitivity of nine geometric error sources was extracted, providing a theoretical basis for error compensation and precision distribution. The geometric error sensitivity analysis method proposed in this paper can accurately evaluate the influence weights of each error term on the machining accuracy, and identify the important sensitive error terms with great influence on the machining accuracy from many error terms.

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“…Multiple laser tracker stations and timedivision measurement can be used to identify the geometric errors of the rotary axis [13]. Zha et al used a four-station laser tracer to measure and separate the geometric error of the rotary axis of a machining center [14]. The indirect measurement of the geometric errors of the rotary axes of five-axis machine tools also includes a dual optical path method and a binocular vision test system [15,16].…”

Section: Introductionmentioning

confidence: 99%

Analysis and improvement of the positioning accuracy of rotary axes of compound machine tools based on pitch error compensation

Shen

2020

Meas. Sci. Technol.

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A method for pitch error compensation analysis and parameter identification for a rotary axis with special structures is proposed to improve the positioning accuracy of the rotary axes of compound machine tools. The characteristics of the planar linkage mechanism of a rotary axis are analyzed. Then, the error compensation trend is obtained according to the corresponding relationship between the angle and the displacement. An angular positioning error piecewise function is used to represent the ideal effect and actual performance of the pitch error compensation of the rotary axis. The rotation positioning accuracy test of the rotary axis is completed with a laser interferometer and rotary calibration device. By the measured angular positioning error of the non-compensated points, the Levenberg-Marquardt algorithm is used to identify the parameter of the piecewise function, and the optimized linkage parameters of the rotary axis are obtained. By the measured angular positioning error of the integer points of the rotary axis, the pitch error compensation value is modified. The distribution of the calculated and measured angular positioning error of the rotary axis under the pitch error compensation is consistent. The compensation results show that the positioning accuracy of the rotary axis can be greatly improved and that it meets the work requirement of the compound machine. The piecewise function of pitch error compensation, linkage parameter identification and improved method of pitch error compensation proposed in this article offer certain reference and application value. The results can improve the rotation positioning accuracy of the rotary axes of machine tools with planar linkages.

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Four-station laser tracer-based geometric error measurement of rotary table

Cited by 15 publications

References 20 publications

Influencing factors of rotary table geometric error measurement using four-station laser tracers

Influencing factors of rotary table geometric error measurement using four-station laser tracers

A Geometric Accuracy Error Analysis Method for Turn-Milling Combined NC Machine Tool

Analysis and improvement of the positioning accuracy of rotary axes of compound machine tools based on pitch error compensation

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