Abstract
The demand for rapid online optical inspection of gear tooth surfaces is increasing, especially for precision gears. In this study, a non-contact optical measurement method was established for the inspection of gear tooth surfaces. For the system architecture, a halogen lamp was selected as the light source, and a collimated beam was produced by an autocollimator. Subsequently, moiré fringes were formed as the collimated beam went through the two linear gratings. The moiré fringes projected on the gear tooth surface were recorded with a charge-coupled device (CCD) camera, and the contour of the gear tooth surface was estimated and reconstructed from the phase information of the fringes by our developed computer codes. To verify the accuracy of the system, a spur gear tooth surface measured by a commercial coordinate measuring machine (CMM) was defined as the reference tooth profile. The tooth topography, involute profile deviation, and axial-direction deviation were successfully calculated by measuring the deviation of the optically measured surface based on the reference gear tooth profiles measured using the CMM.
Highlights
Gears are crucial components in the power transmission of automatic robotics and transportation vehicles
The tooth surface of a spur gear was measured using the projection moiré method, An opticalwith inspection method for gear tooth surfaces usingthree the projection moiré is propo and the measured results were compared those from a commercial forms this paper
Thelead tooth surface a spur gear measured was measured of tooth surface deviations,studied namelyininvolute profile, profile, andof3-D
Summary
Gears are crucial components in the power transmission of automatic robotics and transportation vehicles. With the increasing demand for high-precision gears for speed reducers used in industrial robots and electric vehicles, high efficiency, as well as accurate in-situ inspection of the gear profile and quality grade, are essential in the gear production process. The resolution required for high-quality gear profile inspection is in the range of a few micrometers. The gears are measured by contacting probes on the tooth surface with multiple points or by scanning several traces on the tooth surface. The industrial measurement facility for gear tooth surfaces is usually a coordinate measuring machine (CMM) with contact probing. The resolution increases with the increase of contact points on the tooth surface. The overall measuring time for a gear workpiece increases with an increase in the number of measuring points. The common practice is to measure only a few teeth, typically four teeth oriented 90 degrees apart
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