碩士 / 國立虎尾科技大學 / 創意工程與精密科技研究所 / 98 / Build-up defect is likely to occur in ball spinning grooved-fin tubes. This work applies DEFORM-3D to simulate the process and to figure out the cause of the forming defect. Because of the difficuties encountered in generating elements in the tube fins, the simulation was simplified into spinning thin-wall tubes. The effects of ball size, axial speed, spindle rotation, tangential-to-axial speed ratio and friction factor on the build-up, distribution of effective strain, redundant deformation factor and forming loads were investigated.
The results show that build-up is caused by the increase of infeed, decreasing ball size and axial speed and increasing spindle rotation, speed ratio and friction factor. The effect of the infeed is the most influential.
The effective strain increases with smaller ball size, lower axial speed, higher spindle rotation, higher speed ratio and greater friction factor. Ball size is the most influential to the forming load. Phenomenon is more obvious in the next volume of 0.2 mm compression ball 6 mm in diameter under the conditions of the role of the ball on the tube more difficult to reach the inner surface, together with the feed screw by way of spinning forming, so the outer surface of the tube equivalent strain is much larger than the value of uniform strain deformation, so redundant deformation factor higher.
Axial forming load increases with smaller ball size, higher axial speed, lower speed ratio, lower speed ratio and greater friction factor. Radial forming load increases with larger ball size, higher speed ratio and greater friction factor.
| Identifer | oai:union.ndltd.org:TW/098NYPI5785015 |
| Date | January 2010 |
| Creators | Ruei-Heng Hsu, 許睿恆 |
| Contributors | 林恆勝 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 83 |
Page generated in 0.0233 seconds