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A method for improving the yield rate of composite materials formed by resin transfer molding process

A technology of resin transfer molding and composite materials, which is applied in the field of liquid molding of resin-based composite materials. It can solve the problems of reducing the penetration rate of resin into preforms, shortening the effective injection period of resin, and increasing the difficulty of molding parts, so as to prolong effective injection. time, reduced risk of implosion, less resin effect

Active Publication Date: 2019-03-19
AVIC COMPOSITES +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, the self-accelerating reaction of the resin in the resin storage tank will also lead to an increase in the viscosity of the resin, thereby reducing the penetration rate of the resin into the preform. risk, resulting in increased scrap rates for parts
[0005] Thirdly, when using some special high-temperature, high-toughness and short-aging resins, such as Hexcel’s RTM230ST or Cytec’s PR520, because the injection temperature of this type of resin is relatively high (over 160°C), the curing temperature is only 180°C. Resin has high reactivity at injection temperature, and the risk of implosion is higher than that of conventional resins. At the same time, the effective injection period of this type of resin is extremely short (within 35 minutes), and the use of conventional resin degassing process will further shorten the effective injection of resin period, greatly increasing the difficulty of forming parts

Method used

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  • A method for improving the yield rate of composite materials formed by resin transfer molding process
  • A method for improving the yield rate of composite materials formed by resin transfer molding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The part is an open three-cavity box-section structure of composite material. The material system is CF3031 / BA9914, and the fiber volume content of the material is 55%±3%. Among them, CF3031 is a T300 grade carbon fiber fabric with a specification of 3K produced by Shandong Weihai Development Company, and BA9914 resin is a liquid molding process produced by AVIC Composite Materials Co., Ltd. The developed high temperature epoxy resin, the external dimensions of the parts are: 2000mm×1002mm×200mm (length×width×height), the wall thickness of the parts is 6mm, and the size of the three inner cavities in the middle is 2000mm×250mm×182mm, and the inner cavities on both sides The size is 2000mm×120mm×182mm, according to the calculation, 20kg of BA9914 resin is required; the resin thermostat 5 is pre-processed, and the size of the cavity 6 is: 300mm×100mm×1mm (length×width×height), and the material is 45# steel. The specific implementation steps are as follows:

[0047] 1) Co...

Embodiment 2

[0055] The part is a composite material 2.5D braided fan blade structure. The material system is CCF800 / PR520, and the fiber volume content of the material is 55%±3%. Among them, CCF800 is T800 grade carbon fiber with a specification of 12K produced by Shandong Weihai Development Company, and PR520 resin is Cytec’s high-temperature and high-toughness epoxy resin. The external dimensions of the blade are: 700mm×500mm (length×width), and the thickness gradually changes from 60mm to the blade tip of 1.5mm. According to the calculation, 10kg of PR520 resin is required; the resin thermostat 5 is pre-processed, and the size of the cavity 6 is: 500mm ×100mm×0.3mm (length×width×height), the material is P20 steel. The specific implementation steps are as follows:

[0056] 1) Connect the pressure source 70, the resin storage tank 30, the valve I40, the resin thermostat 5, the valve II41, the mold 4, the valve III42, the resin overflow tank 20 and the vacuum source 60 with the pipeline ...

Embodiment 3

[0064] The part is a non-open three-cavity airfoil structure of composite material. The material system is U-3160 / QY8911-4, and the fiber volume content of the material is 56%±3%. Among them, U-3160 is a T300 grade carbon fiber fabric with a specification of 3K produced by Shandong Weihai Development Company, and the QY8911-4 resin is AVIC composite The material Co., Ltd. developed the high-temperature double-horse resin for the liquid molding process. The external dimensions of the part are: 500mm×1002mm (length×width), the height of one side is 300mm, the height of one side is 0mm, and the wall thickness of the part is 6mm. The size of the three inner cavities is 500mm×250mm×282mm, and the size of the inner cavities on both sides is 500mm×120mm×282mm. According to the calculation, 30kg of QY8911-4 resin is required; the resin thermostat 5 is pre-processed, and the size of the cavity 6 is: 200mm ×150mm×0.5mm (length×width×height), made of copper.

[0065] 1) Connect the pres...

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Abstract

The invention belongs to the resin-based composite material liquid forming technology, and relates to a method capable of improving the yield of a resin transfer molding process forming composite material. A resin heating device is additionally arranged between a resin storage tank and a mold, the injection temperature of resin in the resin storage tank is reduced, the risk of resin implosion in the resin storage tank can be reduced, the effective injection period of the resin can be prolonged, the injection temperature and the injection viscosity of the resin can be precisely controlled, and the forming quality of the composite material part can be obviously improved.

Description

technical field [0001] The invention belongs to the liquid molding technology of resin-based composite materials, and relates to a method for improving the yield of composite materials formed by resin transfer molding technology. Background technique [0002] Carbon fiber reinforced resin-based composite materials have unique advantages such as light weight, high specific strength, high specific modulus, good fatigue fracture resistance, corrosion resistance, and easy large-area integral forming. The amount of key materials used in equipment has also become one of the symbols of the advanced nature of aviation equipment. [0003] Resin transfer molding technology, referred to as RTM molding technology (Resin Transfer Molding) is a liquid molding composite material manufacturing technology widely used in aviation, aerospace and other fields in recent years. The principle is to place a dry fiber preform designed according to the performance and structure requirements in the r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C70/36B29C70/54B29C35/02
CPCB29C35/0277B29C70/36B29C70/54
Inventor 刘强黄峰赵龙马金瑞
Owner AVIC COMPOSITES