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Improved three-point method for turning error and roundness error measurement

A technology of roundness error and rotation error, which is applied in the field of improving the three-point method, can solve the problem of limited improvement of the accuracy of the three-point method, and achieve the effect of improving accuracy

Active Publication Date: 2016-06-08
XI AN JIAOTONG UNIV
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Problems solved by technology

[0007] Both of the above two invention patents reduce the problem of harmonic suppression through the method of angle optimization. Since the optimization objective function mainly considers the transfer matrix W(k) with the smallest determinant, the improvement of the accuracy of the three-point method by the method of angle optimization is limited

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  • Improved three-point method for turning error and roundness error measurement

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] The traditional three-point method test such as figure 1 As shown, three laser displacement sensors measure the radial runout of the surface of the cylindrical inspection rod, and the Fourier coefficient of the roundness error of the inspection rod is calculated by the method of harmonic analysis, and then the roundness error is obtained through Fourier synthesis calculation.

[0023] An improved three-point method for measurement of rotation error and roundness error, comprising the following steps:

[0024] Step 1, the three laser displacement sensors M 1 ,M 2 ,M 3 Mounted at different angular positions with a magnetic base: [0°, 42.8°, 126.4°], record the sensor measurement results with a high-frequency data acquisition system, and then use the three-point error separation technique to calculate the roundness error r(q) Each harmonic Fou...

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Abstract

The invention relates to an improved three-point method for turning error and roundness error measurement. The method includes the following steps that: three displacement sensors are distributed at different angular positions so as to measure the radial run-out of a detection bar, and a high-frequency data acquisition system is utilized to record the measurement results of the sensors, and a three-point error separation technology is utilized to calculate the Fourier coefficients of harmonic waves of roundness error; the second sensor and / or third sensor is re-installed at different angles, the three-point method is repeated to perform measurement for many times, so that each Fourier coefficient can obtain a plurality of estimated values; a Fourier coefficient which is calculated through a transfer matrix of which the determinant is maximum is a most accurate Fourier coefficient estimated value; and the roundness error can be calculated through composite calculation based on the most accurate Fourier coefficient estimated value. With the method of the invention adopted, the accuracy of the estimation of each harmonic wave can be improved, and therefore, the accuracy of whole roundness error measurement can be improved.

Description

technical field [0001] The invention relates to the technical field of measurement of rotation error and roundness error, in particular to an improved three-point method for measurement of rotation error and roundness error. Background technique [0002] The rotation accuracy of the machine tool spindle directly affects the geometric shape error and surface roughness of the machined parts. In order to ensure the machining accuracy of the machine tool, it is necessary to accurately measure the rotation error of the spindle. On the other hand, the roundness error of cylindrical parts (such as bearings and shafts) will affect the running performance of the machine. In order to ensure the running performance of the machine, it is necessary to accurately measure the roundness error of cylindrical parts. [0003] In the measurement of rotation error, a cylindrical inspection rod (or test ball) is required as a measurement reference; in the process of roundness error measurement, a...

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Application Information

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IPC IPC(8): G01B11/00G01B11/24
CPCG01B11/00G01B11/2408
Inventor 林京史生宇王琇峰赵明廖与禾
Owner XI AN JIAOTONG UNIV
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