Forced vibration mechanism and suppression method for thin-walled workpiece milling

• Published in: International journal of mechanical sciences Vol. 230; p. 107553
• Main Authors: Yuan, Xing, Wang, Shuting, Mao, Xinyong, Liu, Hongqi, Liang, Zhaoshun, Guo, Qiushuang, Yan, Rong
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.09.2022
• Subjects: Machining process; Mode shape; Natural frequency; Shear thickening fluid; Thin-walled workpiece; Thin-walled workpiece; Natural frequency; Machining process; Mode shape; Shear thickening fluid
• ISSN: 0020-7403; 1879-2162
• DOI: 10.1016/j.ijmecsci.2022.107553

•The forced vibration mechanism of the thin-walled workpiece under various factors is proposed.•The response mechanism of the shear thickening fluid under the forced vibration shock is proposed.•The parameter relationship between the shear thickening fluid and the thin-walled workpiece under impact condition is analyzed.•The vibration of the thin-walled workpiece is effectively suppressed, and the surface quality of the workpiece to be machined is improved. Thin-walled workpieces are widely used in aerospace applications, but their weak stiffness characteristic leads to forced vibration during milling, which reduces the quality of the milled surface. To solve the forced vibration problem in milling thin-walled workpieces, this paper proposes a forced vibration mechanism for the thin-walled workpiece under the influence of various factors and a corresponding suppression method. First, the response characteristics of the thin-walled workpiece excitation features correlated with the mode shape are given. Then, the vibration shapes of the thin-walled workpiece are combined with the cutting position, and the effects of the cutting force frequency and cutting force magnitude are also considered. Finally, the different vibration characteristics are associated with the time constant properties of the shear thickening fluid (STF), and the corresponding forced vibration effects are suppressed by the STF. After a series of experimental modal analyses and cutting experiments, the results show that the proposed theory can explain the forced vibration phenomenon of the thin-walled workpiece, and the vibration suppression effect of the STF is consistent with the theory. The method is also applicable to vibration suppression at the weak position during the machining of the large workpiece. [Display omitted]