Instantaneous Dynamics of Multi-Axis Milling Thin-Walled Workpiece with Complex Curved Surface

Abstract:

The first step to predict the milling stability is to identify the dynamic characteristics of cutting process. And the mass loading effects of removal material play an important role on the dynamic characteristics of milling process for thin-walled parts, such as impeller, turbine blades and automobile components, which is changing with cutting time or tool position. Therefore, how to identify the instantaneous dynamic characteristics of milling process is one of the most significant problems. In the paper, a structural dynamic modification method with variable mass to predict the instantaneous dynamic characteristics of multi-axis milling thin-walled workpiece with complex curved surface is proposed. The proposed method takes into account the variations of dynamics characteristics of workpiece with the tool position and material removal. And the material cutting process is regarded as the structural dynamic modifications of cutting system, the instantaneous dynamic characteristics of which can be estimated by the extended Sherman-Morrison-Woodbury formula to obtain the corrected frequency response function (FRF). Experiments were carried out to obtain the instantaneous dynamics of a thin-walled workpiece and the results were verified by finite element method (FEM).

• Periodical: Materials Science Forum (Volumes 836-837)
• Pages: 529-535
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.836-837.529
• Online since: January 2016
• Authors: Gang Gang Ju, Qing Hua Song*, Zhan Qiang Liu, Jia Hao Shi, Yi Wan, Xing Ai
• Keywords: Chatter, Material Removal, Thin-Walled Components, Time-Variable Parameters System

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