An Investigation on the Characteristics of the Curved Surface in High Speed Milling Al6061-T6 by a Five-axis Machine Tool
| Autor: | Liu, Mao-Jung, 劉懋融 |
|---|---|
| Rok vydání: | 2014 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 The purpose of this study is to investigate the characteristics of the curved surface in high speed milling Al6061-T6 aluminum alloy by using a five-axis machine tool. The effects on surface roughness and curvature of the machined surface for different milling conditions are studied. The requirement of polishing level surface is achieved for all milling conditions in this study. Firstly, based on high speed machining theory is considered to select fixed milling conditions with spindle speed as 12000 rpm, feed rate as 1000 mm/min, depth of cut as 0.2mm, pitch as 0.1 mm and use of cutting fluid. The variable milling conditions are 5 inclined tool-axis as 0 °, -10 °, -20 °, -30 ° and -40 °; and 3 different milling processes as down milling with unidirectional toolpath, up milling with unidirectional toolpath, and down-up milling with bidirectional toolpath ; as a result, 15 combination of tests are performed. Measurement of average surface and curvature of the machined curved surface are conducted. It was shown that a minimum surface roughness is found as Ra 0.388μm by conducting -100 inclined tool-axis combined with down milling unidirectional toolpath. Furthermore, all of 15 milling conditions can produce polishing level surface requirement as Ra 0.8~0.015μm. In addition, the designed curvature standard in this study is 0.04. A minimum error compared with this standard is found as 0.05% by conducting -100 inclined tool-axis combined with down milling with unidirectional toolpath. It can be concluded that the use of negative angle inclined tool-axis combined with down milling with directional toolpath will improve the quality of machined surface to reach polished level by a five-axis machine tool. Therefore, a subsequent processing time and cost can be reduced and productivity will be improved. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
| Externí odkaz: |
|