A method for processing a double-layer narrow-gap tail nozzle of a sheet metal with a curved axis

CN121514640BActive Publication Date: 2026-10-16CHINA HANGFA GUIZHOU LIYANG AVIATION POWER CO LTD
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Patent Information

Application Number
CN202511481817.X
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-10-16
Publication Date
2026-10-16
Estimated Expiration
2045-10-16

AI Technical Summary

Technical Problem

[0006]常规的双层尾喷管都是将内、外筒形件分别加工制造，然后再通过弓形支架分别将其连接在一起，本发明所研究的尾喷管为垂直转向且进、出口不同形状的异形喷管，外罩组件包容内流道组件结构，中心轴线呈弯曲的垂直形状，常规工艺无法完成组件的装配组合，需要通过科学合理的分型工艺设计，才能保证双层组合结构的工艺可行性，进、出口端面圆周的同心性以及进、出口层间间隙的均匀性

Benefits of technology

[0014]Compared with existing technologies, this invention provides a parting-type processing method for a thin-walled tail nozzle with a double-layer structure and a vertically oriented axis. This invention employs a parting-type design for processing double-layer, narrow-gap, axially oriented hollow sheet metal tail nozzles. Its innovation lies in providing a parting-type method for the double-layer oriented assembly. This method not only ensures the feasibility of the nozzle assembly process but also provides welding conditions for the welding of the narrow annular channel double-layer structure. Using a sequential welding method combined with flexible gas transfer protection, precise assembly of the outer casing assembly and the inner flow channel assembly can be achieved. This solves the technical challenge of assembling complex, irregularly shaped annular structures with double-layer oriented oriented assemblies, improving the structural strength and manufacturability of the nozzle. The successful application of this invention has significant innovative value and promotional significance.

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Abstract

The application discloses a machining method of a double-layer narrow-gap tail nozzle with a curved axis, which comprises the following steps: sequentially carrying out combined welding of all parts of an inner flow channel assembly, welding front supports and rear supports on the outer surface of the inner flow channel assembly, dividing an outer cover assembly into an outer cover front wall and an outer cover rear wall, and welding a rear cylinder body to the outer cover rear wall; assembling the inner flow channel assembly into the cavity of the outer cover rear wall with the rear cylinder body, and welding the inner flow channel assembly and the outer cover rear wall through the front supports and the rear supports; butting the outer cover front wall and the outer cover rear wall, welding the front supports and the rear supports to the corresponding inlet and outlet inner surfaces of the outer cover front wall; checking and correcting the edges of the butted outer cover front wall and outer cover rear wall, and welding the side surfaces of the butted outer cover front wall and outer cover rear wall. The application effectively solves the technical problem that the direct machining and assembly process method of a single component in a conventional nozzle cannot meet the assembly requirements of a turning nozzle, guarantees that the nozzle assembly machining meets various technical requirements, and guarantees that the double-layer turning nozzle is qualified and delivered.
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