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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 42761 (08)
- University: Sharif University of Technology
- Department: Mechanical Engineering
- Advisor(s): Movahhedy, Mohammad Reza; Akbari, Javad
- Abstract:
- In Ultrasonic Assisted Machining (UAM) a mechanical vibration is added to the relative motion of the tool and workpiece. The frequency of vibration is typically from 20kHz to 100kHz and the amplitude is in the range of 10 to 20 microns. Experiments show that using this method improves the machining performance. Reduction in machining forces and tool wear and improving the cooling condition are some of the advantages of UAM. In this work, the forces of ultrasonic assisted milling are investigated. Applying thin shear plane theorem provides an acceptable theoretical base with minimum dependence on experimental data to analyze machining forces. To evaluate the model and find the effect of elliptical ultrasonic vibration on the machining forces, the appropriate experiments are designed. A vibrating table that is able to produce elliptical vibration with single excitement is designed to produce 2D vibration in the workpiece. The experiments show a good agreement between experimental and analytical data. In the experimental condition, both of the tangential and the radial forces reduce by using elliptical ultrasonic vibration whereas the axial force changes are not considerable. Also, the effect of spindle speed on experimental milling forces is compared with the analytical results.
The results show that using ultrasonic assisted milling reduces the milling forces particularly in the tangential and radial directions.
- Keywords:
- Milling ; Ultrasonic-Vibration ; Elliptical Vibrations ; Thin Shear Plane
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