Preparation method of large-diameter thin-wall titanium alloy annular pipe

Abstract

The invention provides a preparation method of a large-diameter thin-wall titanium alloy annular pipe. The preparation method of the large-diameter thin-wall titanium alloy annular pipe comprises thefollowing steps of 1) flat plate winding cylinder; 2) longitudinal seam welding; 3) cylinder section shape correcting; and 4) liquid pouring and bending; a titanium alloy is cut by utilizing a cuttingdevice to obtain a titanium alloy blank, and the cut titanium alloy blank is rolled into an open type cylinder section by virtue of the roll bending forming equipment; the open type cylinder sectionobtained in the step 1) is put on a welding workbench, and then the open type cylinder section is welded through a welding device, and a closed type cylinder section is obtained after the open type cylinder section is welded through the welding device; the closed cylinder section obtained in the step 2) is assembled on a high-temperature-resistant stainless steel creep correcting cylinder mold, then the closed cylinder section is integrally placed in a vacuum thermal creep furnace, vacuumizing and heating treatment are carried out, so that the titanium alloy cylinder is corrected under the action of the vacuumizing and the heating treatment; and the two ends of the titanium alloy cylinder obtained in the step 3) are clamped through a bending clamp. The preparation method has the advantagesthat the number of welding lines is reduced, the welding difficulty is remarkably reduced, and the welding residual stress is released.

Description

technical field [0001] The invention relates to the technical field of annular pipe preparation, in particular to a method for preparing a large-diameter thin-walled titanium alloy annular pipe. Background technique [0002] Compared with high-strength steel pipes, titanium alloy pipes can not only withstand greater working pressure, but also meet the needs of thin-walled and lightweight components in the aerospace field, and are widely used in special parts in aviation, aerospace and other fields. The United States first used titanium alloy pipes on the Lockheed C-5A military aircraft, and then the alloy pipes were promoted and applied in the hydraulic and fuel piping systems of F-14A, F-15 and Boeing 747, 757, 767 and other aircraft. It is also widely used in military aircraft and commercial airliners of Boeing, General Motors, McDonnell Douglas, Pratt & Whitney, Rolls-Royce, Airbus and other companies. In addition to aviation applications, titanium alloy pipes are also w...

AI Technical Summary

Problems solved by technology

[0005] At present, domestic producers do not yet have the ability to prepare large-diameter thin-walled titanium alloy pipes, and cannot directly form large-diameter thin-walled titanium alloy seamless annular pipes

Most of the large-diameter titanium alloy annular tubes are manufactured by block forming + splicing. This preparation method has problems such as large number of welds, difficulty in assembling and welding three-dimensional curved surfaces, and low forming accuracy; Chinese patent CN103008386B discloses a method for preparing straight seam titanium and titanium alloy welded pipes with thickness-to-diameter ratio. Tubular pipe; (2) enter the welding box, argon tungsten arc welding, through argon tungsten arc welding, welded from an unclosed cylindrical shape to a closed tubular shape; (3) weld the welded pipe on-line Induction stress relief annealing; (4) sizing and straightening; (5) eddy current nondestructive testing and ultrasonic nondestructive testing, air tightness testing, in the case of no alarm and pressure relief, it is a qualified pipe. Using this preparation method, although it can Straight seam titanium and titanium alloy welded pipes are obtained, but the preparation process is relatively complicated, which brings great changes to the producers.

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