| Related citation: | Shi-Jian Yuan,Lan Hu,Zhu-Bin He,Bu-Gang Teng,Zhong-Ren Wang.Research on Two-Step Hydro-Bulge Forming of Ellipsoidal Shell with Larger Axis Length Ratio[J].Journal of Harbin Institute Of Technology(New Series),2013,20(3):93-98.DOI:10.11916/j.issn.1005-9113.2013.03.015. |
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| Author Name | Affiliation | | Shi-Jian Yuan | National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China | | Lan Hu | National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China | | Zhu-Bin He | National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China | | Bu-Gang Teng | National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China | | Zhong-Ren Wang | National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China |
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| Abstract: |
| The two-step hydro-bulge forming technique was proposed to manufacture the ellipsoidal shell with the length ratio of the long axis to the short axis larger than 1.4. A central tube was introduced into the first step of the hydro-bulge forming process to constrain the over growth of the short axis during bulging, and then the central tube was replaced with two polar plates in the second step of the hydro-bulge forming process to manufacture an integral ellipsoidal shell. It is shown that the central tube restricts the growth of the short axis and simultaneously reduces the shrunk tendency of the long axis. The wrinkling occurs due to the latitudinal compressive stress at the equator at the early stage of hydro-bulge forming. However, with the increase of internal pressure, the compressive stress areas gradually decrease and finally the tensile latitudinal stress occupies approximately the whole shell, thus the wrinkles are eliminated. A sound ellipsoidal shell with the axis length ratio of 1.8 is obtained after two-step hydro bulging. |
| Key words: hydro-bulge forming ellipsoidal shell latitudinal stress wrinkling axis length ratio |
| DOI：10.11916/j.issn.1005-9113.2013.03.015 |
| Clc Number:TG39 |
| Fund: |
