Design optimization of tool extension components in machine tool assemblies based on the absorber effect between subcomponent modes

Download

10498381.pdf

Date

2022-9

Author

Tola, Hatice Elif

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

224
views

165
downloads

Regenerative vibrations, called chatter, are a major problem limits productivity due to poor surface finish, low material removal rates and decrease in life of machine tool and equipment. Stability lobe diagrams are graphs that give a stable cutting limit at a given spindle speed, developed by the researchers as a chatter prevention tool. Various methods have been investigated to increase the critical cutting limit and suppress the most flexible mode in the machine tool frequency response function(FRF). Tuned mass dampers(TMD) are one of the most widely used tools which achieve vibration attenuation by matching its natural frequency with the system’s. This absorber effect can also be obtained by macthing the modes of the subcomponents of the machine center. A new component can be introduced to the system when modification of the subcomponents such as holder and tool is inconvenient. In this thesis, optimal designs for tool extension component aiming absorber effect is investigated. Dynamic properties of the spindle-holder assembly are acquired by impact hammer tests. Spindle is identified by FRF de-coupling method based on the experimental FRF data of spindle-holder assembly. After FRFs of each subcomponent is obtained, optimal design parameters of the extension and tuning of the extension-tool assembly is investigated to have absorber effect by simulations.

Subject Keywords

Chatter Stability, Machine Tool Dynamics, Spindle Identification, Design Optimization

URI

https://hdl.handle.net/11511/99712

Collections

Graduate School of Natural and Applied Sciences, Thesis

Suggestions

OpenMETU
Core

Identification of bearing dynamics under operational conditions for chatter stability prediction in high speed machining operations Özşahin, Orkun; Özgüven, Hasan Nevzat (2015-10-01) Chatter is a major problem causing poor surface finish, low material removal rate, machine tool failure, increased tool wear, excessive noise and thus increased cost for machining applications. Chatter vibrations can be avoided using stability diagrams for which tool point frequency response function (FRF) must be determined accurately. During cutting operations, due to gyroscopic moments, centrifugal forces and thermal expansions bearing dynamics change resulting in tool point FRF variations. In addition, ...
Analysis and modelling of machine tool dynamics and cutting stability during operation Özşahin, Orkun; Özgüven, Hasan Nevzat; Budak, Erhan; Department of Mechanical Engineering (2014) Self-excited vibrations of machine tools during cutting result in process instability, poor surface finish and reduced material removal rate. In order to obtain stability lobe diagrams to avoid chatter vibration, tool point frequency response function (FRF) must be determined. In classical machine tool studies, tool point FRF is obtained experimentally or analytically for the idle state of the machine. However, during cutting operations, discrepancies are frequently observed between the stability diagrams o...
In-process tool point FRF identification under operational conditions using inverse stability solution Özşahin, Orkun; Özgüven, Hasan Nevzat (2015-02-01) Self-excited vibrations of machine tools during cutting result in process instability, poor surface finish and reduced material removal rate. In order to obtain stability lobe diagrams to avoid chatter vibrations, tool point frequency response function (FRF) must be determined. In classical machine tool studies, tool point FRF is obtained experimentally or analytically for the idle state of the machine. However, during cutting operations, discrepancies are frequently observed between the stability diagrams ...
Analytical modeling of spindle-tool dynamics on machine tools using Timoshenko beam model and receptance coupling for the prediction of tool point FRF Erturk, A.; Özgüven, Hasan Nevzat; Budak, E. (2006-12-01) Regenerative chatter is a well-known machining problem that results in unstable cutting process, poor surface quality and reduced material removal rate. This undesired self-excited vibration problem is one of the main obstacles in utilizing the total capacity of a machine tool in production. In order to obtain a chatter-free process on a machining center, stability diagrams can be used. Numerically or analytically, constructing the stability lobe diagram for a certain spindle-holder-tool combination implies...
Chatter detection using vibrational and acoustic emissions in turning process Süleyman, Büyükkoçak; Kılıç, Şener; Özer, Mehmet Bülent; Ünver, Hakkı Özgür (null; 2013-09-20) Chatter vibration is a longstanding problem for machining industry. It lowers both surface finish quality and life of cutting tool. In this study, real time chatter vibration detection system is designed and tested experimentally. A traditional lathe, equipped with two accelerometers placed on cutting tool in two orthogonal coordinates and a microphone, is used for machining a steel rod in face turning operation. During cutting process analog data of accelerometers and microphone is acquired by data acquisi...

Citation Formats

H. E. Tola, “Design optimization of tool extension components in machine tool assemblies based on the absorber effect between subcomponent modes,” M.S. - Master of Science, Middle East Technical University, 2022.