Analysis of The Design and Grinding Influence on Cutting Performances of End-mills Utilized for High-Speed Machining
| Autor: | Chi-Hsiang Chen, 陳麒翔 |
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| Rok vydání: | 2013 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 102 The development and application of green cutting is essentially dependent on the innovation of machine tools, enhancements in tool development and more sophisticated cutting technologies. The development of tools and cutting technology has a particularly relevant influence. However, the dimension or geometry of end-mill may vary in accuracy due to incomplete parameter design of control factors or the interference of diamond wheel wear factors that might occur in the tool grinding process. That will affect the tool life and the surface roughness of workpiece in the high-speed machining. However, few investigations on tool grinding precision are thoroughly involved in the influence analysis of tool geometric and cutting conditions on multiple quality characteristics for milling performance. This proposed study consists of four sections. In first section, the analysis model of tool geometry is investigated. The second one is the analysis model of tool grinding precision. Then analysis model of parameters affecting cutting performance is determined. The final one focuses on the analysis model of cutting edge of micro- geometry. Eventually, according to the results from the four sections, the key technologies of design, grinding and inspection for end mill can be proposed. The experimental results demonstrate that the finite element analysis model of a macro-milling developed in this study can provide a robust aid tool in end-mill geometric designs for manufacturers or users. For rough machining, tool life and metal removal volume are the primary evaluation indicators and cutting parameters should be primarily considered, particularly cutting speed. Finish machining, workpiece surface roughness are the essential evaluation indicators. Besides the selection of cutting parameters, the design and grinding of endmill are critical factors, especially the design and grinding of relief angles. Verification experiments reveal that the proposed optimization design approach of processing parameters is high potential for improving tool life, metal removal volumes and surface roughness of workpiece under the high-speed cutting. In the initial milling stage, the end-mills with radial cutting edge chamfers yield more significant tool wear in comparison with that of standard end-mills. However, as the accumulated cutting time increasing, the tool wear of the end-mills with chamfers become insignificant in comparison with that of the standard end-mills. Furthermore, at smaller radial and axial cutting depths, the feed per tooth and cutting speed have more significant influences on endmills with radial cutting edge chamfers. That will be beneficial to improve the design, grinding and usage patterns of end-mill. The end-mill can be promoted to the level with the features of the high-performance and green cutting. There would be also positive contribution in technology upgradation for the tool grinder or cutter manufactures in Taiwan. It’s profitable for them to intensify the localization of technologies and enhance the competition. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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