Development of viscoelastic dampers for boring bars

Date

2023-12-06

Author

Kurt, Cihat Furkan

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Self-excited vibrations called chatter is one of the most important problems that occur in machining which causes excessive noise, increased tool wear, poor surface finish, failure of the tool, and/or machine thus reduced productivity. High aspect ratio boring bars with a large Diameter/Length (D/L) ratio exhibit flexibility owing to their geometric characteristics. Consequently, the flexibility in these slenderboring bars directly influences the stability of the machining process. To suppress the chatter vibrations, passive or active damping methods can be employed. In this thesis, a novel damping system for slender boring bars is developed using viscoelastic materials. Viscoelastic dampers, integrated into the boring bars usingrigid connecting elements, are designed to damp the most flexible mode and preventchatter vibrations. The effect of the material type, geometry, dimensions, and locationof viscoelastic dampers is analyzed using the finite element method. Parameter optimization is achieved by creating design matrices. Finite element analysis demonstrates that the developed dampers effectively reduce the peak amplitudes offlexible modes, resulting in an increase in productivity. Finally, the best design concept is manufactured and the performance of the designed viscoelastic damper is experimentally verified. The viscoelastic-damped boring bar developed in this studywill provide a novel contribution to the literature and directly impact the industry forenhanced productivity.

Subject Keywords

Vibration, Machining, Viscoelastic, Damping, Chatter suppression

URI

https://hdl.handle.net/11511/107812

Collections

Graduate School of Natural and Applied Sciences, Thesis