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Geometric error measurement of spiral bevel gears using a virtual gear model for STEP-NC
Authors:S. H. Suh   E. S. Lee   H. C. Kim  J. H. Cho
Affiliation:1. State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China;2. Zhonghe Electromechanical, Henan Energy and Chemical Xinjiang Group Co.Ltd, Xinjiang Baicheng 842300, China
Abstract:
Geometric error measurement is required to evaluate the grade of the manufactured gears. Due to the complexity of the spiral bevel gear, direct measurement with the physical part has been conducted in a very limited way. In this paper, we present an indirect measurement based on the virtual gears model (VGM), obtained by NUBS fitting of the surface points measured by CMM (coordinate measuring machine). By comparing the VGM with CAD model (soft-master model), various errors such as tooth profile error and tooth trace error can be automatically measured. The developed method is simple and robust without requiring a special measuring device, and hence it can be applied for the industrial practice as a means for measuring the tooth profile and tooth trace errors which cannot be measured by the conventional method. Further, the model-based method can be incorporated on the advanced CNC controller based on the new CAM–CNC interface scheme of STEP-NC [STEP (standard for transfer and exchange of product model data) based data model for CAM and CNC interface] as an on-line inspection module. Algorithmic details together with experimental validation results are given.
Keywords:Spiral bevel gear   Gear error measurement   Virtual gear model   Tooth profile error   Tooth trace error   Pitch error   CMM   STEP-NC
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