Precise laser welding combined clamp for large-diameter thin-wall round pipe

Abstract

The invention discloses a precise laser welding combined clamp for a large-diameter thin-wall round pipe. The precision laser welding combined clamp comprises a supporting main shaft, a rear positioning disc, a front positioning plate, a radial positioning and clamping device assembly and axial adjusting devices, wherein the rear end of the supporting main shaft is axially positioned and installed at the axis position of the rear positioning disc of a disc structure, and the supporting main shaft and the rear positioning disc are installed in a rolling fit mode; the radial positioning and clamping device assembly is mounted on the position, between the rear positioning disc and the front positioning plate, of the supporting main shaft and comprises at least two sets of radial positioning and clamping devices which are arranged at intervals in a front-and-back manner and a middle spacer bush which is positioned between the two adjacent sets of radial positioning and clamping devices; and the axial adjusting devices are arranged at the front end and the rear end of the radial positioning and clamping device assembly. On the premise that high positioning precision is met and laser welding is facilitated, butt welding of all multi-section barrels can be completed through one-time clamping and positioning, and the technical scheme is particularly suitable for the laser welding procedure of a large-length-diameter-ratio thin-wall barrel structure workpiece with the strict requirement for coaxiality.

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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