A combination fixture for precision laser welding of large-diameter thin-walled circular tubes

Abstract

The invention discloses a large-diameter thin-walled circular pipe precision laser welding combination fixture, which includes a supporting spindle, a rear positioning plate, a front positioning plate, a radial positioning clamping device assembly and an axial adjustment device; the rear end of the supporting spindle is axially positioned It is installed at the axis position of the rear positioning plate of the disc structure, and the supporting spindle is installed in rolling fit with the rear positioning plate; the radial positioning clamping device assembly is installed on the supporting spindle between the rear positioning plate and the front positioning plate, including At least two sets of radial positioning clamping devices arranged at intervals in the front and rear and a middle spacer sleeve positioned between two adjacent sets of radial positioning clamping devices; the axial adjustment device is arranged at the front and rear of the radial positioning clamping device assembly ends. The present invention can realize the butt welding of all multi-section cylinders in one clamping and positioning under the premise of satisfying high positioning accuracy and being convenient for laser welding, and is especially suitable for thin-walled cylinders with large aspect ratio and strict requirements on coaxiality Laser welding process for structural workpieces.

Description

technical field [0001] The invention relates to a welding combination fixture, in particular to a combination fixture suitable for precision laser welding of large-diameter thin-walled round pipes, and belongs to the technical field of precision laser welding. Background technique [0002] Precision welding refers to the welding process that achieves the purpose of precise forming and manufacturing through high-energy-density welding. Precision welding mainly includes laser welding, electron beam welding, diffusion welding and welding fusion near net shape technology. Laser welding is to use a laser beam with high energy density to focus on the surface of the workpiece, so that the metal on the surface of the radiation area is "melted" and bonded to form a welded joint. The essential feature of laser welding is heat conduction welding based on the pinhole effect, that is, laser radiation heats the surface of the workpiece to form, and the surface heat diffuses to the inside ...

AI Technical Summary

Problems solved by technology

However, the existing laser welding fixtures for thin-walled cylindrical workpieces are generally clamped by chucks and axially displaced on the outside of the two thin-walled cylindrical workpieces that need to be butt welded in order to facilitate disassembly. Butt joint, because the clamping surface of the chuck jaws is limited, it is easy to cause the outer wall of the thin-walled cylindrical structure workpiece to shrink and deform due to the local pressure of the jaws, not only the positioning accuracy is not high, the outer wall surface is easy to be damaged, but also it is easy to cause butt splicing In addition, the multi-section cylinder needs to be welded with a large length-to-diameter ratio thin-walled cylinder structure workpiece, the traditional laser welding fixture for the thin-walled cylinder structure workpiece cannot achieve one-time clamping and positioning Butt welding of all multi-section cylinders can be completed, usually multiple clamping is required, but multiple clamping cannot meet such thin-walled cylinders with large length-to-diameter ratios that have strict coaxiality requirements, such as solid rocket motor shells Laser welding process requirements for structural workpieces

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