光学精密工程2025，Vol.33Issue(12)：1889-1901,13.DOI:10.37188/OPE.20253312.1889
工业CT小模数塑料齿轮齿距偏差测量数据处理方法
Pitch deviation measurement of small module plastic gears using industrial CT
摘要
Abstract
Industrial Computed Tomography(ICT)technology provides a non-contact solution for preci-sion measurement of small module plastic gears,effectively addressing multiple challenges in their metro-logical processes.This study provided a data-processing method for plastic,small-modulus gear point clouds obtained from ICT measurements.In the data-preprocessing stage,the gear measurement model acquired through ICT scanning was converted into a gear measurement point cloud,while a design point cloud was generated from the gear CAD model.Subsequently,point-cloud registration was performed be-tween the measured and designed point clouds,consisting of four steps:pre-registration,coarse registra-tion of the hole point cloud,fine registration of the hole point cloud,and registration of the gear-tooth point cloud.A measurement point-cloud segmentation method guided by the design point cloud was then adopted.The article first employed the DBSCAN algorithm to segment the designed tooth-surface point cloud,after which the segmented design point cloud guided the segmentation of the measured tooth-sur-face point cloud.Pitch-deviation evaluation points were extracted through this procedure to enable a com-prehensive pitch-deviation assessment.Experimental results demonstrate that compared with gear measur-ing center measurements,the proposed method achieves the difference with maximum absolute value of single pitch deviation of 2.8 μm for left and right tooth flanks,and the difference with maximum absolute value of total cumulative pitch deviation of-6.6 μm.The developed ICT-based data processing method-ology for gear pitch deviation measurement establishes a methodological foundation for precision evalua-tion of complex CT-measured gears,while providing valuable references for ICT-based measurement of other intricate precision components.关键词
工业CT/齿轮/点云配准/点云分割/齿距偏差Key words
industrial CT/gears/point cloud registration/point cloud segmentation/pitch deviation分类
机械制造引用本文复制引用
李京忱,汤洁,石照耀..工业CT小模数塑料齿轮齿距偏差测量数据处理方法[J].光学精密工程,2025,33(12):1889-1901,13.基金项目
国家重点研发计划子课题(No.2017YFF0204804) （No.2017YFF0204804）
