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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48714 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Movahhedy, Mohammad Reza
- Abstract:
- Chatter in milling causes problems like damage to the device, losing precision or sleekness, increase in cannibalization, damage to the spindle, higher level of noise, and problem in thin objects. Current theories in regenerative chatter in filing, has a high relation with a work time (ρ~1), but in less deep filing (ρ≪1), these theories have errors (ρ is time per rotation period). Some of the usages of less deep filing are: 1- surfaces that are hard to file 2- creating curve surfaces 3- sleeking surfaces.Formulating these chatters and solving them using nonlinear methods help using the correct filing depth to reduce them. Goal of this project is to solve chatter equations in low depth filing and finding the process stability graph in milling in 2 degrees of freedom (one for device and the other for the piece). If the piece is flexible, paying attention to the degree of freedom is very important. In this article we used 2 degrees of freedom to improve precision of the results. We have compared the results with experiment data.In this process, the force of piece and device are seen as a function of filing (w_a) and movements of the device. This model can be linear or nonlinear. According to the found w_a we can find the border of stability of the system by using bifurcation method. In this article we used analytical and numerical methods to solve the equations. In the end the results are compared to experiments from the reference articles to find out if they are correct or not
- Keywords:
- Vibration ; Stability ; Milling ; Chatter Stability ; Low Depth Milling
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