Method for controlling annular gap small clearance of spherical box bottom of 5M-level thin-wall storage box

Abstract

The invention discloses a method for controlling an annular gap small clearance of a spherical box bottom of a 5M-level thin-wall storage box, and aims to realize the control on the annular gap small clearance before an annular gap of the spherical box bottom of the 5M-level thin-wall storage box is welded. The method comprises the following steps: initially calibrating a welding tool; mounting a box bottom circular ring on a welding tool mould; mounting a box bottom circular ring lower compressing tool, and compressing the lower end of the box bottom circular ring; milling the lower end of the box bottom circular ring, wherein the box bottom circular ring is milled to be level with a reference line of the lower edge of the box bottom circular ring; supporting an internal supporting tool of a transition ring outwards, enabling a transition ring external compressing tool to compress a box bottom transition ring, and ensuring that the end faces of welded joints between the box bottom transition ring and the box bottom circular ring lower end are closely fitted.

Description

technical field [0001] The invention relates to the field of welding of spherical bottoms of storage tanks, in particular to a method for controlling small gaps in ring seams of spherical bottoms of 5M thin-walled storage tanks. Background technique [0002] The storage tank of a launch vehicle is a large tank-shaped box used to store fuel. During rocket launch, the storage tank not only stores fuel but also bears the axial thrust load of the rocket. Therefore, the sealing and structural strength of the storage tank are critical. High demands were made. The storage tank is welded by the middle box body and the bottom of the box. The bottom of the storage box is generally spherical, and the middle ring, transition ring, and box bottom top cover are welded sequentially along the circular weld seam after being assembled and welded by multiple fan-shaped melon petals. made. The assembly and welding of the ring seam of the box bottom is an important process in the processing of...

AI Technical Summary

Problems solved by technology

[0015] 1. The traditional welding seam compression method adopts the overall compression method of a single strip air bag, and there is a possibility that the weld seam of the workpiece cannot be compacted locally.

2. Reliable positioning methods are rarely used when installing and pressing the workpiece and the pressing device, the assembly efficiency is low and the assembly accuracy cannot be better guaranteed

3. After milling and cutting, the parts need to be repositioned and pressed, so that the assembly accuracy of the circular weld can not be better guaranteed

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