On-site self-calibration method for measurement system error of precise rotary table

A technology of rotating table and measuring system, applied in the direction of measuring devices, instruments, etc., can solve the problem of lack of self-calibration method of rotating table, and achieve the effect of high-precision system error self-calibration and high-precision calibration work

Active Publication Date: 2012-10-10
TSINGHUA UNIV +1
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Problems solved by technology

However, this method makes full use of the characteristics of the electromagnetic induction angle sensor, and is only suitable for rotary tables with electromagnetic induction sensors, not for rotary tables with other types of

Method used

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  • On-site self-calibration method for measurement system error of precise rotary table
  • On-site self-calibration method for measurement system error of precise rotary table
  • On-site self-calibration method for measurement system error of precise rotary table

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Embodiment Construction

[0024] The technical solution of the present invention will be described in further detail below with reference to the accompanying drawings and specific implementation steps.

[0025] An on-site self-calibration method for precision rotary table measurement system error disclosed by the present invention is realized through the following technical solutions:

[0026] An in-situ self-calibration method for precision rotary table measurement system error, characterized in that the self-calibration method includes the following steps:

[0027] 1) Prepare a glass plate 1, which has N equally divided fan-shaped scoring lines 2, and the angle between each scoring line is 360 / N°, where N is a positive integer constant, and the fan-shaped scoring lines on the glass plate The deviation from the ideal reticle is recorded as auxiliary error A n , where n=0,1,…,N-1;

[0028] 2) The glass plate 1 is fixedly placed on the calibrated rotary table 5, and the calibrated rotary table 5 is eq...

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Abstract

The invention discloses an on-site self-calibration method for measurement system error of a precise rotary table and belongs to the field of precision processing and measurement. A glass plate with sector-shaped scribed lines is adopted as an auxiliary measurement device and is fixed on the rotary table and an angle sensor which is arranged on the rotary table is used for reading out the angle corresponding to each sector-shaped scribed line on the glass plate; the glass plate is rotated for a certain angle relative to the rotary table and the angle sensor is used for reading out the angle corresponding to each scribed line at the attitude; aiming at the measurement data at the two attitudes, a measurement system error equation with transitive property is constituted and the system error can be obtained by the closed circle principle of rotational degree of freedom to complete on-site self-calibration of measurement system error of the precise rotary table. By adopting the method provided by the invention, the function of calibrating high precision rotary tables by utilizing low precision sector-shaped scribed lines can be realized without high-precision calibration tools. The method has the advantage of high calibration precision and is applicable to precision rotary tables with various angle sensors.

Description

technical field [0001] The invention relates to an in-situ self-calibration method for the error of a precision rotary worktable measurement system, which belongs to the field of precision machining and measurement. Background technique [0002] Precision rotary tables are widely used in various industrial automation systems, including machining centers, CNC machine tools, robots, production lines, etc., and are receiving more and more attention in the high-precision equipment industry. Due to the deformation of the rotary table and the inaccurate measurement of the angle sensor caused by the manufacturing process, assembly and non-centroid drive, the rotation angle θ n The actual rotation angle θ with the table a There is a certain deviation between them, that is, the systematic error G n ,Such as figure 2 shown. This will greatly reduce the positioning and motion accuracy of the rotary table, thereby affecting the processing and detection accuracy of precision machinin...

Claims

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Application Information

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IPC IPC(8): G01B21/22
Inventor 朱煜胡楚雄胡金春马竞徐登峰张鸣成荣
Owner TSINGHUA UNIV
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