Study of key techniques in the vacuum vessel assembly for the future fusion reactor
Ji, Haibiao (2020-12-14)
Väitöskirja
Ji, Haibiao
14.12.2020
Lappeenranta-Lahti University of Technology LUT
Acta Universitatis Lappeenrantaensis
School of Energy Systems
School of Energy Systems, Konetekniikka
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Kaikki oikeudet pidätetään. In reference to IEEE copyrighted material which is used with permission in this thesis, the IEEE does not endorse any of Lappeenranta-Lahti University of Technology LUT's products or services. Internal or personal use of this material is permitted. If interested in reprinting/republishing IEEE copyrighted material for advertising or promotional purposes or for creating new collective works for resale or redistribution, please go to http://www.ieee.org/publications_ standards/publications/rights/rights_link.html to learn how to obtain a License from RightsLink.
Julkaisun pysyvä osoite on
https://urn.fi/URN:ISBN:978-952-335-601-6
https://urn.fi/URN:ISBN:978-952-335-601-6
Tiivistelmä
Effective use of fusion energy is one important way to maintain sustainable development for human beings. The China fusion engineering test reactor (CFETR) is a nextgeneration fusion experimental device planned for construction in China, which will establish a key engineering technology foundation for China’s independent development and construction of a magnetic confinement fusion reactor. The double-wall vacuum vessel (VV), as the core component of the magnetic confinement fusion reactor, provides a stable operation environment and neutron shielding for plasma. Owing to the large scale and tight manufacturing tolerances of VV, the Institute of Plasma Physics Chinese Academy of Science (ASIPP) has carried out research on a full-size, 45° VV (1/8 sector) to develop and demonstrate the fabrication technologies of a double-wall VV.
The purpose of this doctoral thesis is to resolve the difficulties of measurement, machining, assembly, welding deformation and so forth in the manufacturing process of VV by completing the manufacture of PSs (poloidal segments), 1/32VV and 1/16 VV, and to provide strong technical support for the construction of the1/8 sector and the CFETR VV.
This study takes PSs, 1/32 VV and 1/16 VV as the research object. High-precision machining of PSs and 1/32 VV is completed using the technologies of reverse engineering and laser tracker measurement. Based on inherent strain theory, the welding deformation analysis of PS2, 1/32 VV and 1/16 VV can be accomplished using ABAQUS software, and the welding deformation is reduced by using welding fixtures and reserving welding shrinkage allowance. A modular flexible assembly tooling system is designed here as well. Laser tracker is used to complete the high-precision assembly positioning and welding deformation measurement of VV.
At present, the manufacturing of PSs, 1/32 VV and 1/16 VV has been completed and the dimensional accuracy meets the design requirements, which provides technical reserve and engineering experience for the follow-up manufacturing of the 1/8 VV mockup and the CFETR VV.
The purpose of this doctoral thesis is to resolve the difficulties of measurement, machining, assembly, welding deformation and so forth in the manufacturing process of VV by completing the manufacture of PSs (poloidal segments), 1/32VV and 1/16 VV, and to provide strong technical support for the construction of the1/8 sector and the CFETR VV.
This study takes PSs, 1/32 VV and 1/16 VV as the research object. High-precision machining of PSs and 1/32 VV is completed using the technologies of reverse engineering and laser tracker measurement. Based on inherent strain theory, the welding deformation analysis of PS2, 1/32 VV and 1/16 VV can be accomplished using ABAQUS software, and the welding deformation is reduced by using welding fixtures and reserving welding shrinkage allowance. A modular flexible assembly tooling system is designed here as well. Laser tracker is used to complete the high-precision assembly positioning and welding deformation measurement of VV.
At present, the manufacturing of PSs, 1/32 VV and 1/16 VV has been completed and the dimensional accuracy meets the design requirements, which provides technical reserve and engineering experience for the follow-up manufacturing of the 1/8 VV mockup and the CFETR VV.
Kokoelmat
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