Abstract
Aiming at the structuring characteristics of thin disc workpiece, we propose the weight removing model and control methods to reduce the mass unbalance vector. Based on the material removing and correcting principle for unbalance workpiece, the weight removing model of drilling and reaming hole way and internal and external arc milling is discussed. The iterative control method with variable weight removing rate is proposed to reduce the weight removing material of the first-time correction and improve the ultimate correcting accuracy. The online measuring and correcting feasibility for unbalance workpiece is verified by experimental way. The advantages of the proposed iterative control method are discussed by simulation analysis. The research results can be used for the online correction of the unbalance disc workpiece on the NC machine tools or automatic dynamic balancing machine.
Highlights
After the unbalance vector of workpiece has been measured, the weight removing way is the common method used to correct the unbalance component on the NC machine tools or automatic dynamic balancing machine
Zhang et al proposed an influence coefficient calibration and online updating method based on hierarchical Bayesian method for automatic dynamic balancing machine [7]
(2) e online correcting accuracy can be assessed according to the amplitude of the residual unbalance vector after the unbalance workpiece was corrected. e influence factors of correcting accuracy include the measuring and correcting errors
Summary
According to the estimated unbalance vector and the weight removing model, the simple weight removing strategy can be used to remove the equivalent material in workpiece directly. In practical applications, influenced by the measuring and correcting errors, the residual unbalance vector may be greater and still exceed the allowable range after one-time weight removing. It is difficult to obtain the true influence coefficient, but the estimated vector of the influence coefficient can be calculated as follows in the process of iterative control:. It can be seen from (22) that the suitable weight removing rate (α) can be found and the control equation (14) will be stable when the phase difference between the true influence coefficient and the estimated influence coefficient does not exceed the range of (−90°, 90°). If the measu→ring →and calculating value of unbalance vector is exact (Ut U), the main affecting factor of the workpiece balance accuracy is the correcting error (2) e online correcting accuracy can be assessed according to the amplitude of the residual unbalance vector after the unbalance workpiece was corrected. e influence factors of correcting accuracy include the measuring and correcting errors
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