Vacuumizing method for composite-material forming process

A composite material and molding process technology, applied in the field of composite material molding, can solve the problems of many R-angle areas, bridging of plates, inability to exhaust air, etc., to achieve good compaction effect, eliminate bridging, and eliminate surface depression failures Effect

Inactive Publication Date: 2016-06-29
HARBIN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there are the following problems: when pasting the vacuum bag, the base of the vacuum nozzle is directly placed on the plate, because the thickness of the honeycomb is too large, and there are too many R-angle areas, it is impossible to discharge all the air, so the minimum compaction effect of 80Kpa cannot be achieved. As a result, after curing, the board often has bridging, delamination, dents and other faults, and even directly leads to the scrapping of the board

Method used

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Embodiment Construction

[0022] The invention provides a vacuumizing method for a composite material forming process, comprising the following steps:

[0023] Step 1. Lay the composite material prepreg on the mold 1, and cover the prepreg with isolation film and air felt in sequence;

[0024] Step 2. Take another air felt and glass cloth, overlap the air felt and glass cloth into multi-layer strips, and ensure that the outermost two sides are air felt to form the air guide belt 2;

[0025] Step 3. Press and stick one end of the air guide belt to the air felt laid by the mold through adhesive tape;

[0026] Step 4, laying a vacuum bag on the air felt of the mould, and the air suction port 3 of the vacuum bag is arranged on the free end of the air guide belt;

[0027] Step 5. Vacuum through the exhaust port.

[0028] In particular, there are multiple air guide belts.

[0029] The length of the air guide belt is 30-50 centimeters.

[0030] The air felt of the air guide belt has 3 layers.

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Abstract

The invention provides a vacuuming method used in composite material forming process. The invention uses the suspension method to place the vacuum nozzle, avoids the contact between the vacuum nozzle and the plate, raises the position of the vacuum nozzle, and avoids the problem that the air in the R corner area cannot be eliminated due to the thick honeycomb. Double layers of air felt are used under the vacuum nozzle, and two layers of breathable fibers are added between the air felts to form a good passage to completely remove the air and achieve a compaction effect of 80Kpa. Put an end to bridging, layering and other faults.

Description

technical field [0001] The invention belongs to the field of composite material molding. Background technique [0002] When pasting the vacuum bag, the base of the vacuum nozzle is directly placed on the plate (attached figure 1 ), due to the large shape of the plate, the thickness of the honeycomb is too large (30 mm), and there are too many R-angle areas (attached figure 2 ), it is impossible to remove all the air, so the compaction effect of the minimum negative pressure of 80Kpa cannot be achieved, and indentations will appear on the surface of the plate. Therefore, after curing, the board often has bridging, delamination, surface depression and other faults. Contents of the invention [0003] purpose of the invention [0004] The honeycomb sandwich structure with large dimensions is made of prepreg, and the middle layer is processed by NOMEX honeycomb with complex structure and shape. The surface of the product is uneven, and the dimensions and curvature are larg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/44B29C70/54
CPCB29C70/443B29C70/54B29C2791/006
Inventor 杨雷
Owner HARBIN
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