A Study on Ultrasonic Vibration Assisted Milling of Aerospace Materials
| Autor: | Chia-Hao Yang, 楊家豪 |
|---|---|
| Rok vydání: | 2017 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 105 Aerospace materials is known as hard processing materials, other than traditional super-alloy such as titanium alloy and nickel base alloy, the next generation use composite materials, ceramics and other advanced materials to form a much more energy-saving aircraft body structure. Therefore, ultrasonic-assisted machining or other non-traditional processing techniques are essential. In this study, titanium alloy surface roughness and tool wear characteristics is observed by applying ultrasonic vibration assisted milling during the process. First of all, is to explore the characteristics of the ultrasonic tool handle such as the length of the tool and the amount of suspension for the tool amplitude. Then discuss about amplitude, tool length and overhang, machining parameters, helix angle on the surface roughness and tool flank wear. Finally, the application of ultrasonic vibration assisted in other aerospace materials is discussed. The results of this study show that the length of the tool and the amount of suspension does affect the amplitude of the tool. During the processing of titanium, with the use of linear speed of 60m/min, radial depth of 3mm, axial depth of cut 0.1mm with ultrasonic frequency 30kHz, amplitude 4.64μm, each blade feed 0.05mm / tooth, the optimum surface roughness of 0.183μm is obtained, as the amplitude increase the surface roughness increase. The optimum surface roughness was obtained when the blade was fed with 0.02 mm / tooth and 0.05 mm / tooth with the amplitude of 4.64μm. The change of the amount of both the length of the tool and overhang can reduce the surface roughness, but the use of over length tool will make the surface roughness worse. As for the cutting force, the use of ultrasonic assistance with the aid of 25,35,45 degrees helix angle can effectively reduce the cutting force. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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