| dc.description.abstract | In response to the development of Industry 4.0, the demand for cycloid gears has increased significantly. On the other hand, precision machining methods are also popular today, the inspection of cycloid gears becomes therefore more important, as the precision of the cycloid gear increases. The aim of this thesis is to propose a precision evaluation method for machined profiles of cycloid gears. With comparison of the measured contour and the ideal cycloid contour, three errors can be evaluated, namely the eccentricity error of the cycloid profile, the pitch error and the profile error.
The algorithm proposed in this paper I developed based on the ＂Iterative closest point＂ method. Three tooth profiles of the measured contour are simultaneously moved and oriented to minimize the difference with the ideal contour. The center position deviation and the orientation angle of each individual tooth profile can be thus obtained. The convergence speed is also increased. The calculated results can be further converted into profile eccentricity error, tooth pitch error, and tooth profile error to evaluate the manufacturing errors and to improve manufacturing process of cycloid disc.
Before analysis of the actual cases using the proposed algorithm, the algorithm is at first verified with test data. Test data is generated from the ideal tooth profile by presetting different error sets of eccentricity, pitch and profile errors. The verification results show that the difference between the calculated error and the preset error is less than 1 m, which proves that this algorithm can effectively evaluate the measured contour of the cycloid with error.
The actual cases analyzed in this thesis are divided into two types of cycloidal discs, namely “CYCLO” and “RV”. The contour data used in the case study were measured by the HEXAGON coordinate measuring machine. The original data were all entire profile data of the cycloid disc. Through the comparison of different machining conditions, the results are distinguishable, and it is also proved that the algorithm proposed in this thesis can correctly analyzed the cycloidal contour.
The research results conducted in this thesis can confirm that the proposed algorithm can effectively evaluate the errors of the cycloidal contour. The evaluation results are helpful to judge the precision situation of manufacturing process and to control and to improve afterwards. | en_US |