Method for forming composite material pipe mold element by pressurizing air bags with assistance of resin film transfer

A composite material and resin film technology, which is applied in the field of manufacturing engineering, can solve the problems of rare reports of tubular composite material parts and the difficulty of getting rid of the difficulty in demoulding tubular male mold tooling, and achieves the expansion of the scope of application of the process, product quality and manufacturing process. The effect of optimizing and reducing manufacturing costs

Inactive Publication Date: 2014-10-01
AVIC COMPOSITES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are few reports on the manufacture of tubular composite parts using the RFI process
Although the RFI process integrates the advantages of prepreg molding process and liquid molding, it still has its limitations. For example, the resin film needs to be laid on the bottom of the mold first, close to the profile, and the autoclave equipment must be used for molding. When pressing, the resin flows from the inside to the outside surface to impregnate the fibers, so it is mostly used to make flat composite parts
Moreover, if the conventional RFI process is used to form tubular composite parts, it still has to be limited to the disadvantages of male mold stacking operation, and thus cannot get rid of the difficulty of demoulding the tubular male mold tooling

Method used

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  • Method for forming composite material pipe mold element by pressurizing air bags with assistance of resin film transfer
  • Method for forming composite material pipe mold element by pressurizing air bags with assistance of resin film transfer

Examples

Experimental program
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Effect test

Embodiment 1

[0024]In the manufacture of a straight carbon fiber circular tube with a diameter of Φ50mm, a wall thickness of 2.0mm, and a length of 600mm, the steel combined female mold is composed of an upper and lower mold, and the diameter of the uniformly distributed pores is Φ0.5mm, and the spacing is 5mm; The inner core soft mold is made of rubber material, with a wall thickness of about 1.5mm and a diameter of Φ40mm; the adhesive film adopts a medium-temperature 125°C curing epoxy resin system, and the surface density of the adhesive film is 100g / m 2 ;The reinforcing fiber is plain weave cloth woven with 3K carbon fiber, and the surface density of the carbon fiber cloth is 193g / m 2 , according to the direction of ± 45 ° sewing into about Φ42mm or so carbon fiber sleeve.

[0025] During operation, the soft mold of the inner core of the airbag is filled with a certain air pressure to a diameter of about Φ42mm, covered with 15 layers of epoxy resin film, and then covered with 10 layers...

Embodiment 2

[0028] In the manufacture of a linear carbon fiber oval tube with a diameter of Φ65mm, a wall thickness of 1.5mm, and a length of 1500mm, the steel shape mold is composed of an upper and lower mold, and the diameter of the uniformly distributed pores is Φ3mm, and the spacing is 50mm; the inner core of the airbag is soft The mold is made of rubber material, the wall thickness is about 3mm, and the diameter is Φ60mm; the adhesive film adopts a high temperature 180°C curing epoxy resin system, and the surface density of the adhesive film is 75g / m 2 ; The reinforced fiber is U3160 unidirectional T300 carbon fiber fabric, and the surface density of the carbon fiber cloth is 160g / m 2 .

[0029] During operation, the inner core soft mold is filled with a certain air pressure to a diameter of about Φ63mm, covered with 9 layers of epoxy resin film, and then covered with 9 layers of carbon fiber sleeves on the film. After the paving is completed, it is moved to the shape mold, and then...

Embodiment 3

[0031] In the manufacture of an "S"-shaped carbon fiber oval tube with a diameter of Φ150mm, a wall thickness of 2.5mm, and a length of 1500mm, the steel shape mold is composed of three 1 / 3 modules, and the diameter of the uniformly distributed pores is Φ1.0mm , the spacing is 30mm; the inner core soft mold is made of silicon-containing heat-resistant rubber material, the wall thickness is about 3.0mm, and the diameter is Φ135mm; the adhesive film is made of low-temperature 100℃ polyurethane resin system, and the surface density of the adhesive film is 350g / m 2 ;The reinforced fiber is made of 6K carbon fiber braided pipe sleeve, which is woven by industrialized machines. The fiber weaving is mainly in the direction of 0° / 90°.

[0032] During operation, add a self-made oblong rod-shaped inflatable airbag rod in the inner cavity of the airbag inner core soft mold, inflate it until the diameter of the airbag inner soft mold is about Φ140mm, and cover with 6 layers of modified bis...

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Abstract

The invention belongs to the technical field of manufacture engineering, relates to a manufacture technology method of a high-performance composite material pipe mold element, and particularly relates to a method for forming a composite material pipe mold element by pressurizing air bags with assistance of resin film transfer. According to the invention, a dry state fiber fabric and a thermoset resin adhesive film act as a base of a material, so that the method has the multiple advantages of reducing the manufacture cost obviously, improving the production efficiency effectively, expanding the application range of the manufacture technology extremely and the like. Compared with the traditional prepreg-autoclave technology, the fiber / adhesive film pre-dipping process is saved, so that on one hand, the using of a pre-dipping machine is prevented, and the cost of production equipment is reduced obviously, and on the other hand, the reduction of manufacture links improves the production efficiency effectively; additionally, most importantly, as for manufacture of pipe mold elements with the dry state fiber structure incapable of being treated by the pre-dipping mode, such as fiber 2.5D / 3D braided structure, the technology provided by the invention can also be used, and the technology application range is expanded extremely.

Description

technical field [0001] The invention belongs to the technical field of manufacturing engineering, and relates to a manufacturing process method for a high-performance composite material pipe-shaped piece, in particular to a method for forming a composite material pipe-shaped piece with the aid of airbag pressurization for resin film transfer. Background technique [0002] Thermosetting resin-based composite tubular parts have a large number of applications and application potentials in the fields of aerospace vehicles, high-speed trains, high-performance ships, automobiles and special equipment. Such as the "S" type air inlet of advanced aircraft, air-conditioning gas pipes for various aircraft and high-speed train cabins, connectors for various special equipment, etc. [0003] The traditional manufacturing methods of tubular structural parts mainly include prepreg molding technology and liquid molding technology. The prepreg molding process first preforms the fiber and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/48B29K67/00B29K63/00B29K77/00B29L23/00
CPCB29C70/48B29K2063/00B29K2067/00B29K2077/00B29L2023/00
Inventor 陈蔚叶宏军刘立朋张晨乾成理
Owner AVIC COMPOSITES
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