Measurement method of helical gear profile parameters based on machine vision
In order to solve the problem that the helical angle of the helical gear is easy to produce a shadow of the end face image when measuring the contour parameters of the helical gear by machine vision,which leads to low measurement accuracy,an improved measurement scheme using high-resolution double telecentric lens and close-range backlight source is proposed,and the Otsu image binarization processing method is combined to obtain the ideal gear end face image.At the same time,the contour feature point method is proposed to obtain the intersection point between the line segment connected to the center of mass of the gear center and the tooth tip contour,and the intersection point between the connected line segment and the tooth root contour after rotating a certain angle in the same direction,and the obtained intersection point is used to realize gear parameter measurement by circle fitting.Experimental results show that the absolute error value of the measurement is within the range of 0.02 mm,and the error of the measurement result is small.
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