Calculation method of rotation error and roundness error based on hybrid four-point method based on three-point method

A technology of roundness error and rotation error, which is applied in the field of calculation of rotation error and roundness error based on the hybrid four-point method based on the three-point method, can solve the problem of three-point method with few operation steps, and achieve accurate, stable and easy measurement results. The effect of less understanding and operation steps

Active Publication Date: 2020-01-21
XI AN JIAOTONG UNIV
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Problems solved by technology

However, this solution requires multiple measurements, and loses the outstanding advantages of the three-point method, which can be monitored online and has fewer operating steps.

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  • Calculation method of rotation error and roundness error based on hybrid four-point method based on three-point method
  • Calculation method of rotation error and roundness error based on hybrid four-point method based on three-point method
  • Calculation method of rotation error and roundness error based on hybrid four-point method based on three-point method

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Embodiment Construction

[0028] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0029] refer to figure 1 , a calculation method for rotation error and roundness error based on the hybrid four-point method of the three-point method, including the following steps:

[0030] Step one, such as figure 2 As shown, in the same section perpendicular to the axial direction of the rotary shaft, align the four displacement sensors with the axis of the rotary shaft, and press the angle [0,θ 1 ,θ 2 ,θ 3 ] arrangement, where θ 1 = 20°, θ 2 =90°, θ 3 = 150°, after the rotary shaft starts to rotate, the four displacement sensors sample 500 points per circle, and respectively measure the radial runout signal M of the outer surface of the rotary shaft 0 , M 1 , M 2 , M 3 ;

[0031] Step 2, divide the four signals into three groups, M 0 , M 1 , M 2 for the first group, such as image 3 Shown; M 0 , M 1 , M 3 for the second group, ...

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Abstract

The invention provides a method for calculating a rotation error and a roundness error of a hybrid four-point method based on a three-point method. The method comprises the steps of: firstly, measuring radial runout at different circumferential positions by means of four displacement sensors, dividing four paths of signals into three groups, calculating each order harmonic Fourier coefficients ofthe roundness error by applying a three-point method error separation technology on each group to obtain three groups of estimated values, selecting the group with the maximum transfer matrix determinant value for each order harmonic, and determining the Fourier coefficients in the group with the maximum transfer matrix determinant value as Fourier coefficient calculated values of the present order of the final roundness error; acquiring a final roundness error estimated value through inverse Fourier transform according to the determined Fourier coefficients of each order; and subtracting a radial runout measured value and the roundness error estimated value to obtain a rotation error estimated value of a principal axis in a direction. The method can separate the rotation error and roundness error more precisely and stably, can perform real-time online monitoring, and has better inclusivity for included angles among the sensors.

Description

technical field [0001] The invention relates to the technical field of measurement of rotation error and roundness error of a precision rotating shaft such as a machine tool spindle, and in particular to a method for calculating rotation error and roundness error of a hybrid four-point method based on a three-point method. Background technique [0002] The spindle is the core component of the machine tool. The rotation error of the spindle will be directly reflected in the geometric shape error and surface roughness of the machined parts. It is an important factor affecting the machining accuracy and reliability of the machine tool, and it is also an important indicator to measure the performance of the machine tool. The real-time and accurate measurement and evaluation of the spindle rotation error can not only repair the spindle in time to ensure the processing quality of the product, but also analyze and trace its characteristics, thereby improving the processing capacity ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B21/00G01B21/20
CPCG01B21/00G01B21/20
Inventor 林京李德翔史生宇赵明刘翰扬
Owner XI AN JIAOTONG UNIV
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