Duo Yang This email address is being protected from spambots. You need JavaScript enabled to view it.1, Tianding Chen1, and Chengfei Rao1
1School of Mechanical Engineering, Dalian University, Dalian 116622, China
Received: April 1, 2021 Accepted: August 6, 2021 Publication Date: September 11, 2021
Copyright The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are cited.
As chatter vibration in roll grinding process is the largest limitation in surface quality of machined roll. In this paper, the bistability analysis and chatter suppression are performed for further discussion of patterns of the grinding chatter to reduce the cost of enterprises. A new three degrees of freedom dynamic model with both the regenerative effect and nonlinear stiffness of grindstone indicated by Duffing oscillator is presented, and its availability is validated by the experiment. By means of the DDE-BIFTOOL, a numerical calculation package, the effect of process parameters on grinding stability is studied extensively, proving that a large grinding width worsens the stability in roll grinding and the parameters locating in unsafe areas should be avoided for a stable grinding operation in practice. In addition, the control techniques involving both the nonlinear velocity feedback and the chaos perturbation are proposed for the suppression of chatter vibration in grinding operation to decrease the amplitude of its vibration. The results show that these techniques give a significant performance for reducing the amplitude of chatter vibration, namely, the stability of grinding process is augmented, which give a new idea for firms in chatter suppression.
Keywords: Grinding, Regenerative chatter, Bistability, Chatter suppression, Chaos control
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