In view of the decreasing trend of wire drawing die aperture, the present methods of measuring exist many problems. In order to improve the measurement precision of wire drawing die aperture of micro hole, the spin measurement and Fraunhofer diffraction have been combined in this system. In the process of measurement, the wire drawing die center axis is rotated continuously so as to form elliptical holes with different shape on CCD. Various parameters of wire drawing die are measured using the function rela...
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