A high-rigidity hollow sandwich structure and manufacturing method

Through the design of corrugated reinforcement ribs and superplastic forming diffusion bonding technology, the problem of optimizing structural weight and strength in the aerospace field is solved, the manufacture of high-rigidity hollow sandwich structures is realized, and the structural deformation resistance and manufacturing efficiency are enhanced.

CN119057394BActive Publication Date: 2025-09-16AVIC BEIJING AERONAUTICAL MFG TECH RES INST
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Patent Information

Application Number
CN202411233656.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-04
Publication Date
2025-09-16
Estimated Expiration
2044-09-04

AI Technical Summary

Technical Problem

In the aerospace field, traditional metal structure manufacturing technology has structural defects in the connection and integration process, resulting in decreased structural strength and increased weight, and traditional reinforcement methods are difficult to meet high performance requirements.

Method used

The wavy reinforcement rib design is adopted, combined with superplastic forming and diffusion bonding technology. By analyzing the stress and deformation form of the hollow sandwich structure, the rib curve profile is designed so that the wave crest is close to the maximum deformation point and the wave trough is close to the fixed constraint end. Isostatic pressing and inert gas treatment are carried out in a high-temperature environment to achieve precise formation of the ribs and one-time molding of the overall structure.

Benefits of technology

It significantly improves the rigidity and durability of the structure, while reducing the manufacturing difficulty and weight, optimizing the force distribution, making it suitable for bearing complex loads, and improving manufacturing efficiency and structural performance.

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Abstract

The present invention belongs to the field of advanced structural design and manufacturing technology, and specifically relates to a high-rigidity hollow sandwich structure and a manufacturing method. The method first analyzes the stress and deformation of the hollow sandwich structure to determine the maximum deformation point and the fixed constraint end. Based on these points, the curve profile of the rib is designed so that the wave crest is close to or passes through the maximum deformation point, and the wave trough is close to the fixed constraint end. Then, an isolation agent is applied to the area outside the curve profile of the rib. After that, the thin plate blank and the solid blank are stacked in sequence, placed in a high-temperature environment, and isostatic pressure is applied to perform diffusion connection to make the blanks become one. Finally, an inert gas is introduced at high temperature, and superplastic forming technology is used to complete the manufacture of the high-rigidity hollow sandwich structure. Through this "S-shaped" or "zigzag" rib design, the structural rigidity is improved while ensuring the accessibility of the process.
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