Workpiece straightness in-situ self-calibration measurement method based on fused fourier three-point method

Abstract

The application discloses a workpiece straightness in-situ self-calibration measurement method based on a fusion Fourier three-point method, and the traditional Fourier three-point method is affected by the spacing error between sensors, thereby affecting the accuracy of the workpiece straightness measurement result. The application is based on the fusion Fourier three-point method, the Fourier coefficient estimation values of the workpiece straightness harmonics are obtained by performing multiple Fourier three-point method measurements, and the Fourier coefficient estimation value with the minimum spacing uncertainty is selected according to the propagation rule of the spacing uncertainty in the Fourier three-point method measurement, and finally the optimized workpiece straightness is calculated. The application can inhibit the measurement error caused by the sensor clamp machining error to a certain extent, and the Fourier coefficient estimation value with the minimum spacing uncertainty is selected, so that the workpiece straightness measurement accuracy is improved.

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