Ring formation process method for large vacuum chamber fan-shaped section with double-layer thin-wall structure and D-shaped cross section

Abstract

The invention belongs to the field of magnetically confined controlled thermonuclear fusion vacuum equipment manufacturing, and particularly relates to a ring formation process method for a large vacuum chamber fan-shaped section with a double-layer thin-wall structure and a D-shaped cross section. Specifically, by welding an inner support tool for the D-shaped sections, the problems of assembly fixation and detection and back surface argon shielding during sectional splice welding of inner shells are solved, and that the 20 fan-shaped sections are consistent in dimensions is ensured; a laser demarcation device and a steel channel scribe contour gauge are utilized to ensure that the distribution curves of steel channels are accurate in positions; the mechanical stress relieving method is adopted for reducing the welding stress between the inner shells and the steel channels, and the deformation of the inner shells is controlled; by performing skip welding and plug welding on outer shells and the steel channels in a symmetric manner and then performing splice welding on sections of the outer shells, the plug welding deformation and the displacement and dislocation during plug welding of the outer shells are controlled; by manufacturing a detecting tool for the outer shells, the deformation during plug welding of the outer shells is controlled, the overall profile dimensions of the outer shells are detected, the stress distribution is balanced by vibration aging, and the profile dimensions are stabilized.

Description

technical field [0001] The invention belongs to the field of magnetic confinement controlled thermonuclear fusion vacuum equipment manufacturing, and in particular relates to a process method for forming rings of sectors of a large-scale double-layer thin-walled D-shaped cross-section vacuum chamber. Background technique [0002] The sector of the vacuum chamber is used to manufacture the vacuum chamber of the main part of the magnetic confinement thermonuclear fusion device. In the new vacuum chamber designed according to the research status of thermonuclear fusion at home and abroad, the sector is one-twentieth of the vacuum chamber, which is a space double The double-layer hyperboloid D-shaped cross-section thin-walled structure is welded by the inner shell, channel steel and outer shell, and the main material is nickel-based alloy N06625. [0003] The welding structure of the inner shell, channel steel and outer shell is poor in rigidity. There are a large number of supp...

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