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Encapsulation method for reducing vacuum leakage in composite material formation

A composite material and packaging method technology, applied in the field of composite material molding, can solve problems affecting the internal quality of composite materials, porosity or delamination defects in parts

Active Publication Date: 2014-05-28
BEIJING AERONAUTICAL MFG TECH RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After curing, gas is embedded between the layers of the part, which will cause pores or delamination defects in the part, thus affecting the internal quality of the composite material

Method used

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  • Encapsulation method for reducing vacuum leakage in composite material formation
  • Encapsulation method for reducing vacuum leakage in composite material formation
  • Encapsulation method for reducing vacuum leakage in composite material formation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] In this example, using figure 2 Encapsulated in the manner shown. Lay the carbon fiber / BMP316 polyimide resin prepreg on the mold, place the Bleader Lease E isolation cloth and Air Weave UHT800 air felt produced by AIRTECH in the United States in sequence, and then take the THERMALIMIDE vacuum bag as the packaging material to cover the carbon fiber / BMP316 polyimide resin prepreg, leave enough margin for the THERMALIMIDE vacuum bag, and paste it on the mold with the A-800-3G type sealing tape between the sealing groove of the inner ring first, so that the prepreg The material is sealed on the mold by the resin vacuum bag to form the first sealed space.

[0035] Take the Air Weave UHT800 air felt to cover the second air guide groove, and then paste the edge of the THERMALIMIDE vacuum bag on the mold with the outer ring A-800-3G sealing strip to form the second air guide groove between the inner ring seal groove and the outer ring seal groove. Sealed space. Open the s...

Embodiment 2

[0037] In this example, using figure 2Encapsulated in the manner shown. Lay the glass fiber / BMP350 polyimide resin prepreg on the mold, place the E5555 isolation cloth produced by American Richmond Company and the first-stage mat produced by Shanghai Fengya in sequence, and then take Richmond's VAC-PAKUHT-750 vacuum The bag is used as the packaging material to cover the glass fiber / BMP350 polyimide tree prepreg, leave enough margin for the VAC-PAK UHT-750 vacuum bag, and pass Richmond’s SM between the inner ring sealing groove first -5160 sealing tape is pasted on the mold, so that the prepreg is sealed on the mold by the VAC-PAK UHT-750 vacuum bag to form the first sealed space.

[0038] Take the first-stage felt to cover the second air guide groove, and then paste the edge of the VAC-PAK UHT-750 vacuum bag on the mold with the outer ring SM-5160 sealing strip to form the second air guide groove between the inner ring seal groove and the outer ring seal groove. Two sealed ...

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Abstract

The invention belongs to the technical field of composite material formation, and relates to an encapsulation method for reducing vacuum leakage in composite material formation in an autoclave composite material forming process. An inner ring sealing rubber strip and an outer ring sealing rubber strip are arranged in the method, a first sealing space is formed between a prepreg and an inner ring sealing ring, and a second sealing space is formed between the inner ring sealing ring and an outer ring sealing ring. When the outer ring encapsulation material leaks, the second sealing space is communicated with the external space; and because the first sealing space is isolated with the second sealing space, the air of the external space can only enter the second sealing space, and vacuum environment of the first sealing space is kept. By adopting the encapsulation method, two sealing spaces are formed around a workpiece, so that the problem of vacuum leakage in solidifying formation of a composite material at a high temperature and under a high pressure can be effectively solved; and tests prove that the probability of vacuum leakage in the solidification process is reduced from original over 90 percent to below 20 percent.

Description

technical field [0001] The invention belongs to the technical field of composite material molding, and relates to a packaging method suitable for reducing vacuum leakage in composite material molding during the autoclave composite material molding process. Background technique [0002] The operation method of the autoclave molding method is to lay the prepreg on the mold according to the lay-up requirements, seal it in a vacuum bag, put it into the autoclave, and heat and pressurize the autoclave equipment to complete the material. The curing reaction makes the prepreg blank into a component with the desired shape and quality requirements. on the mold according to figure 1 In the sequence shown, the product prepreg blank and various auxiliary materials are combined and then installed between the packaging material (ie vacuum bag) and the mold. During the bagging process, the door of the autoclave can be closed to wait for the temperature to rise after confirming that the s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C73/34B29C70/54
Inventor 蒋蔚曹霞纪斌逸邱启艳
Owner BEIJING AERONAUTICAL MFG TECH RES INST
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