Manufacturing method of internal bladder of annular titanium alloy gas cylinder

Abstract

The invention relates to a forming processing technology for an annular metal gas cylinder, in particular to a manufacturing method of an internal bladder of an annular titanium alloy gas cylinder, which comprises the following steps: (1) forging a titanium alloy plate to form two annular half-round tubes; (2) turning holes at the air inlet hole and air outlet hole positions of the annular titanium alloy half-round tubes; (3) welding an air inlet pipe nozzle and an air outlet pipe nozzle respectively on the turned holes in a vacuum argon filling protective chamber; (4) chemically milling the inner walls of the two annular titanium alloy half-round tubes to the required thickness; (5) welding the inner ring weld seam and outer ring weld seam of the two annular titanium alloy half-round tubes to form the sealed internal bladder; and (6) carrying out vacuum heat treatment. The weld seam has beautiful appearance, does not have welding defects such as air holes and has good high pressure resistant performance; the strength meets the design requirements; simultaneously the appearance of the internal bladder does not have deformation after welding, does not need correction, and meets thedesign tolerance requirement; and chemical milling is substituted for turning for the inner wall of the internal bladder to effectively solve the deformation caused by turning.

Description

technical field [0001] The invention relates to a forming and processing technology of a metal annular gas cylinder, in particular to a manufacturing method of a titanium alloy annular gas cylinder liner. Background technique [0002] The annular gas cylinder is an important part of the cold injection system of the spacecraft. It is an energy storage element used to store compressed air. It has a high working pressure. At the same time, as an aerospace product, the product is required to be light, high-strength, and the fatigue life meets the design requirements. [0003] As an important part of the annular gas cylinder, the annular liner was once made of rubber material, but due to the inherent weaknesses of rubber materials such as easy aging and poor air tightness, the service life of the spacecraft is short, and it is difficult to adapt to the development of aerospace technology. . It is currently the best plan to manufacture the inner tank of titanium alloy annular gas...

AI Technical Summary

Problems solved by technology

And in this patent step (5) the inner and outer annular seams of two annular metal semicircular pipes described in welding form a closed annular metal pipe and do not propose a specific plan for how to weld, and how to realize the protection of the back side of the weld seam is the key The key to product quality assurance, because the inner wall of the assembled annular metal tube is in a closed position, the commonly used gas protection backing plate on the back of the weld is difficult to apply, and the weld shape on the inner surface of the inner tank is also difficult to guarantee

In addition, the guarantee of the roughness of the inner surface is traditionally processed by a five-axis linkage CNC lathe, which can easily cause deformation of the entire titanium alloy liner, which is difficult to meet the requirements of the spacecraft.

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