A main pipe positioning welding fixture and welding deformation control method

Abstract

The invention provides a positioning and welding clamp for a header pipe and a welding deformation control method. A traditional header pipe welding process is optimized and improved, a phased welding manner is adopted, and the header pipe welding process is divided into three phases which are the primary assembly welding phase, the secondary assembly welding phase and the header pipe welding phase respectively; before formal welding, test parts of a primary assembly and a secondary assembly are machined, detailed header pipe reverse deformation data are acquired, and an effective reserved reverse deformation basis is provided for formal header pipe welding according to the reverse deformation data; through the brand-new designed positioning and welding clamp for the header pipe, it is possible to effectively control the deformation in the formal header pipe welding process; the deformation is effectively controlled on a ring pipe not participating in assembling, and the size and location degree of the welded header pipe are effectively guaranteed; and the quality reliability and production efficiency of the header pipe are improved, and in practical application, the correction value of the header pipe is reduced by 50% and the assembling period is shortened by 40%.

Description

technical field [0001] The invention belongs to the technical field of manufacturing aero-engine parts, in particular to a header pipe positioning welding fixture and a welding deformation control method. Background technique [0002] As an important component of an aero-engine, the fuel manifold has a direct impact on the performance and working stability of the afterburner, and a set of high-quality fuel manifold can provide an excellent fuel concentration distribution field for the afterburner. [0003] With the continuous improvement of the performance of aero-engines, the structure of the fuel manifold is becoming more and more complex, and the number of parts in the manifold is also increasing. The number of parts in the fuel manifold of individual types of aero-engines is close to 200, resulting in dense welds on the manifold. [0004] Since the fuel main pipe is welded by a number of parts, the parts mainly include the ring pipe, the ear seat, the spray rod, the plug...

AI Technical Summary

Problems solved by technology

[0003] With the continuous improvement of the performance of aero-engines, the structure of the fuel main pipe is becoming more and more complex, and the number of parts in the main pipe is also increasing. The number of parts in the fuel main pipe of individual types of aero-engines is close to 200, resulting in dense welds on the main pipe.

[0004] Since the fuel main pipe is welded by a number of parts, the parts mainly include the ring pipe, the ear seat, the spray rod, the plug and the spray rod mounting seat, and the welding is a process of local uneven heating and cooling, and the composition of the main pipe Some of the parts are thin-walled structural parts. Therefore, problems such as welding deformation, welding stress concentration, welding shrinkage and large deformation are prone to occur during and after welding, and the size and position of the main pipe after welding are not easy to ensure

Due to the large welding deformation, the test state of the manifold flow and direction is unstable. During the assembly process of the manifold, it will interfere with other parts of the engine. Therefore, it is necessary to repeatedly correct the manifold, which seriously affects the quality and reliability of the manifold. It also inevitably prolongs the production cycle of the main pipe

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