TANG Jie,LIU Xiao-bing,LI Rui.Vision measurement of pitch and profile deviations for small modulus gears with unknown parameters[J].Optics and Precision Engineering,2021,29(01):100-109.
TANG Jie,LIU Xiao-bing,LI Rui.Vision measurement of pitch and profile deviations for small modulus gears with unknown parameters[J].Optics and Precision Engineering,2021,29(01):100-109. DOI: 10.37188/OPE.20212901.0100.
Vision measurement of pitch and profile deviations for small modulus gears with unknown parameters
Using contact measurements for small modulus gears is difficult owing to the limited tooth spaces. This work focuses on the vision measurement of small modulus gears with unknown parameters. Based on the sub-pixel technique used in digital image processing, the gear measurement datum, which is the geometric center of the gear, is located. Thereafter, the tooth number, modulus, diameter of the tooth addendum circle, and diameter of the tooth dedendum circle are calculated. According to the definition of gear accuracy in ISO 1328-1:2013, this study introduces an evaluation method and a measurement process for gear pitch deviations and profile deviations based on visual measurements, and an evaluation software is developed. A visual measurement test on the pitch and profile deviations of involute cylindrical spur gears with a modulus of 0.5 mm was carried out, and the results were compared with those from a gear measurement center. The comparison indicated that the absolute error in the left and right tooth surface measurements had a maximum value of 4 μm and a minimum value of 1 μm; the gear accuracy for both cases was judged to be grade 8. This vision measurement system can be used for small modulus gears within a certain range.
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