Method for repairing sandwich panels made of composite materials involving the creation of core or of mould using stereolithography

A repair method and composite material technology, which is applied in the field of repair composite sandwich panels, can solve problems such as bad customer impression, large ecological impact of parts, and high cost of new parts

Inactive Publication Date: 2016-07-13
AIRCELLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, these replacements may require lead times for new parts, and if parts are not available in stock, then they must be remanufactured
In addition, the cost of new parts can be quite expensive, the ecological impact of discarding an entire part is also very high, and a complete change of a part can give customers a bad impression

Method used

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  • Method for repairing sandwich panels made of composite materials involving the creation of core or of mould using stereolithography

Examples

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no. 1 example

[0028] According to a first embodiment, the next step D consists of making, from the digital file, a mold 10 comprising a smooth inner surface 12 having the same shape as that in the damaged part of the plate by means of stereolithography. The curved section corresponds to the curved section.

[0029] The next step E consists of making the core 14 and / or repairing the skin in the mold 10, using the material and according to known molding methods, covering a surface at least equal in size to the opening 6 of the plate to be replaced; repairing the skin 4 with to be bonded to the core (2, 14).

[0030] According to a second embodiment, instead of the above-mentioned last two steps D, E, in a further step F, the core 14 and / or the skin 4, also obtained by stereolithography methods, are produced directly and are also A bent portion corresponding to the bent portion in the damaged portion of the board is included.

[0031] Stereolithography is a technique also known as rapid prot...

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Abstract

The invention discloses a method for repairing sandwich panels made of composite materials following impact that has damaged the core of this panel. The method is characterized in that the method includes acquisition of a numerical model of the shape of the damaged zone then use of a stereolithography method based on the numerical model to create a replacement core (14) or a mould (10) in which this replacement core will be moulded, followed by creation of a replacement component (18) comprising this core, then the installation of this component which is fitted into an opening (6) cut in the sandwich panel around the damage, and finally attachment of the replacement component to the panel.

Description

technical field [0001] The present invention relates to a method of repairing composite sandwich panels, as well as sandwich panels and turbojet engine nacelles repaired by this method. Background technique [0002] Composite sandwich panel with a central core covered by two outer skins and composed of reduced mass components comprising high rigidity. [0003] Plates of any shape can be manufactured and they are used more and more, especially in the aerospace field. Plates of this type are used in particular in nacelles containing turbojet engines for making rigid structures including good aerodynamic profiles. [0004] The manufacture of these panels generally involves the manufacture of a core, which may be rigid foam, or a structure with transverse honeycomb cavities of plastic or aluminum alloy, which is in particular clad in a In resin-impregnated fibers, the folds constitute the skin on each side. [0005] Next, the assembly is pressed in a mold and baked in an oven...

Claims

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Application Information

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IPC IPC(8): B29C73/04B29C73/06B29C67/00
CPCB29C73/06B33Y10/00B29C64/135B29C73/04B29L2031/3076B64F5/40B33Y80/00B28B1/001B29L2031/749B64D27/16B64D29/08F01D25/24F05D2220/323F05D2230/31F05D2230/60F05D2230/80
Inventor 阿尔诺·德勒乌泽让-菲利普·穆希里
Owner AIRCELLE
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