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Cold extrusion strengthening method for assembling hole of CFRP composite material laminate

A composite material layer and assembly hole technology, which is applied in the direction of chemical instruments and methods, lamination, and lamination auxiliary operations, can solve the problems that the assembly holes of CFRP composite laminates have not attracted widespread attention, the fatigue performance of CFRP composite components is reduced, Affect aircraft durability design and other issues to achieve the effect of improving notch sensitivity, helping maintenance, and good wear resistance

Inactive Publication Date: 2015-05-20
COMAC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the holes on the composite member destroy the integrity of the member and are the weak link of stress concentration on the structural parts, which leads to the reduction of the fatigue performance of the CFRP composite member and directly affects the durability design of the aircraft
Although relevant domestic research institutions have conducted extensive and in-depth research on the preparation technology of assembly holes of CFRP composite structural parts, the research work mainly focuses on how to improve the quality and efficiency of hole making. How to carry out assembly holes of CFRP composite laminates Anti-fatigue manufacturing has not attracted widespread attention, and there is still a lack of reports on relevant research results

Method used

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  • Cold extrusion strengthening method for assembling hole of CFRP composite material laminate

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Embodiment Construction

[0033] In the detailed description of the following embodiments, the detailed embodiments and the specific operation process are given on the premise of the technical solution of the present invention, but the protection scope of the present invention is not limited to the following embodiments.

[0034] Combine below Figure 1 to Figure 7 The technical scheme of the present invention is further described. Figure 1 to Figure 7 The operation process of the cold extrusion strengthening method of the assembly hole of the CFRP composite laminate according to an embodiment of the present invention is illustrated in sequence, and the specific operation is as follows:

[0035] Step 1: Use, for example, a cemented carbide drill bit 2 to drill the CFRP composite laminate 1 to ensure that there is no delamination of the composite laminate at the entrance and exit of the assembly hole 11, such as figure 1 shown;

[0036] Step 2: Use the reamer 3 to ream the assembly hole 11 drilled in...

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Abstract

The invention provides a cold extrusion strengthening method for an assembling hole of a CFRP composite material laminate. The method comprises the following steps: (a) providing a bush, wherein the bush can be assembled in the assembling hole; (b) providing a metal core rod with the taper, and inserting the core rod into the bush; (c) arranging the bush in the assembling hole; (d) applying axial force to the core rod by virtue of extrusion equipment, so that the bush is extruded by the part, with the largest diameter, of the core rod; and (e) removing the core rod, so that the bush is fixedly arranged in the assembling hole. Aiming at the assembling hole of the CFRP composite material laminate, the bush is adopted and is matched with a cold extrusion strengthening process, so that the fatigue life of parts can be effectively prolonged, and the service time of an aircraft is prolonged. Because the bush is fastened in the assembling hole, the wear resistance of the connecting structure is improved, and the detachment of assembling fasteners and the maintenance of the parts can be promoted.

Description

technical field [0001] The invention generally relates to composite material surface strengthening technology, in particular to a cold extrusion strengthening method for the assembly hole of CFRP composite laminate. Background technique [0002] Compared with metal materials, composite materials are superior in specific strength, specific stiffness, and corrosion resistance, and their application range as industrial materials is becoming wider and wider. The amount of composite materials has become an important symbol of the advancement of aircraft and even the advancement of the aerospace field. It is the core technology that the world's powers are competing to develop, and it is also a key development area for our country. [0003] Carbon fiber reinforced resin matrix composite (CFRP: Carbon Fiber Reinforced Plastic) laminate is a composite material cured by resin matrix and carbon fiber reinforcement together, with high specific strength and specific stiffness, and good c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B38/04
CPCB32B38/00B32B2038/0096
Inventor 方伟刘登伟葛恩德苏宏华肖睿恒
Owner COMAC
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