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Liquid forming method of composite material for closed die built-in resin flow distributor

A technology of flow distributor and composite material, applied in the field of resin matrix composite material liquid molding, can solve the problems of low fiber volume fraction, difficulty in obtaining product size and shape accuracy, and product complexity reduction, etc., to achieve cost reduction and greater freedom. , the effect of reducing the molding manufacturing process

Inactive Publication Date: 2011-09-14
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The disadvantage of the half-mold RTM molding technology using a flow distributor is that it is difficult to obtain the same product size and shape accuracy as the closed-mold RTM molding product, the complexity of the product is relatively reduced, and the fiber volume fraction is relatively low. Therefore, half-mold RTM molding Composite products are generally not used as the main load-bearing components in aerospace vehicles

Method used

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  • Liquid forming method of composite material for closed die built-in resin flow distributor
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  • Liquid forming method of composite material for closed die built-in resin flow distributor

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Experimental program
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preparation example Construction

[0031] (1) First, the preparation of the resin flow distributor:

[0032] 1) Select the mold material according to the required molding pressure (0.05MPa~2.5MPa) and molding temperature (room temperature~300℃) of the composite material molding parts. Generally, the mold materials that can be selected are metal or non-metal (such as composite materials, ceramic cores, etc.) mold or wooden mandrel) to close the mold;

[0033]2) Then select a resin flow distributor that is close to the rigidity and hardness of the mold material. The resin flow distributor adopted in the technical solution of this patent is a metal fiber braided mesh (see Chinese patent, application number is 201020597767.4, and the name is "a kind of metal braided mesh resin flow distributor for composite material molding"). The preparation method is to select the material of the metal fiber according to the rigidity and strength of the resin flow distributor and the requirements of the molding temperature of th...

Embodiment 1

[0042] Example 1: Large RTM Formed Composite Laminate Structure Toughened "Out of Situ" Between Layers

[0043] (1) Design a stainless steel fiber braided mesh resin flow distributor with a double-layer structure. The surface layer of the resin flow distributor is a 100-mesh fine-mesh fabric, and the support layer is a coarse-mesh fabric with a thickness of 0.6mm. The two layers are assembled using conventional hot-press sintering techniques and then planarized using conventional hot-rolling techniques. See the utility model patent "A Metal Braided Mesh Resin Flow Distributor for Composite Material Forming" (application number 201020597767.4).

[0044] (2) The mold cavity size is 1500mm × 1500mm × 10mm, and the closed structure steel mold is split. The above-mentioned stainless steel fiber braided mesh resin flow distributor is laid on the whole area of ​​the mold, and the resin flow distributor is installed on the side of the normal installation. For the center gate, set mul...

Embodiment 2

[0049] Example 2: High Viscosity Epoxy Large RTM Formed Composite Laminate Structure

[0050] (1) Thermoplastic resin PAEK toughened high-temperature epoxy resin (brand 5288, product of Beijing Aeronautical Materials Research Institute) resin has the characteristics of a multi-phase resin system, and its resin viscosity is relatively high, which is equivalent to the resin viscosity of prepreg grade, so The RTM injection process window is relatively narrow (short resin flow filling time, short resin process), so a high-rigidity 5-layer stainless steel fiber braided mesh resin flow distributor is designed, and its surface layer is 100 mesh fine mesh fabric. The support layer is 5 layers of coarse mesh fabric with a thickness of 0.5mm. As mentioned in the utility model patent "A Metal Braided Mesh Resin Flow Distributor for Composite Forming" (application number 201020597767.4), the entire resin flow distributor is assembled by hot pressing and sintering technology, and then flat...

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Abstract

The invention belongs to a novel die technology for liquid forming of a resin-based composite material, and relates to a liquid forming method of a composite material for a closed die built-in resin flow distributor. The detachable multilayer metal fiber mesh grid resin flow distributor is placed on the inner surface of all or partial die cavity in a closed die, and a resin transfer molding technology of the composite material is realized by using the special rigid closed die. The liquid forming method has the technical characteristics that: by integrating the characteristics of high size and shape precision and high fiber volume fraction of liquid forming of the rigid closed die and large manufacturing size, quick resin flow, quick impregnation and the like of liquid forming of a vacuum bag of a semi-rigid die, a more advanced, more flexible and low-cost liquid forming technical scheme for a composite material member with large size, high shape and size precision and high performance is provided.

Description

technical field [0001] The invention belongs to the resin-based composite material liquid forming technology, and relates to a composite material liquid forming method with a resin flow distributor built in a closed mold. Background technique [0002] The liquid molding technology of resin-based composite materials includes resin transfer molding (referred to as RTM) and its various derivative technologies. Among them, closed rigid mold (referred to as "closed mold") RTM molding is the most classic technology. Its principle is as follows: figure 1 Shown: First, under the action of pressure 3, the upper mold 5 and the lower mold 6 of the mold are laminated. After the lamination is completed, the resin 7 is injected into the preform 4 through the resin injection port 1, and the glue outlet 2 is maintained in a vacuum state. . [0003] Traditionally, closed mold RTM molds are made of dense metal materials, and the inner surface is smooth, so that the molded product has a high ...

Claims

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Application Information

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IPC IPC(8): B29C70/48
Inventor 益小苏安学锋李宏运唐邦铭仝建峰马宏毅高军鹏张晨乾张代军闫丽崔海超刘刚张尧州
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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