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Composite material vacuum bag forming method

A composite material and molding method technology, which is applied in the field of resin-based composite material liquid molding manufacturing, can solve the problems of easy thermal damage, low temperature resistance level, poor self-supporting ability, etc., achieve low cost, improve efficiency and quality, and promote resin the effect of flow

Active Publication Date: 2013-03-27
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this kind of flexible resin flow distributor is generally a grid structure made of thermoplastic resin, the temperature resistance level is usually low, and it is easy to be damaged by heat during the molding process of composite materials, thus limiting the molding temperature grade of composite materials
In addition, the grid structure prepared by this kind of thermoplastic resin has poor self-supporting ability and poor surface dimensional accuracy, which will cause obvious unevenness on the surface of the composite material after molding, and even affect the overall dimensional accuracy and accuracy of the composite material parts. internal quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Adopt the vacuum bag forming method of the present invention to prepare composite material plate parts, the metal fiber diameter of the selected metal fiber braided net resin flow distributor surface layer is 0.1mm, the mesh number is 300 mesh, and the thickness is 0.5mm; The diameter of the metal fiber is 1mm, the mesh number is 50 mesh, and the thickness is 1mm.

[0035] Fit the support layer of the selected metal braided mesh resin flow distributor to the surface of the flat mold, and use a flat tooling of the same size as the mold surface to apply pressure to the metal fiber braided mesh resin flow distributor to make it fit tightly On the surface of the mold, the pressurization range is 1MPa, and the holding time is 2h to complete the molding of the metal fiber braided mesh resin flow distributor.

[0036]After applying the release agent on the surface layer of the metal fiber woven mesh resin flow distributor, spread a piece of polytetrafluoroethylene satin cloth ...

Embodiment 2

[0040] Adopt the vacuum bag molding method of the present invention to prepare composite material U-shaped beam parts, the metal fiber diameter of the selected metal fiber braided net resin flow distributor surface layer is 0.05mm, the mesh number is 400 mesh, and the thickness is 0.2mm ; The metal fiber diameter of the support layer is 0.1mm, the number of meshes is 80 meshes, and the thickness is 0.5mm.

[0041] Fit the supporting layer of the selected metal braided resin flow distributor to the mold surface of the mold half, and apply pressure to the metal fiber braided resin flow distributor to make it tightly adhere to Fit to the surface of the mold, the pressure range is 2MPa, and the holding time is 3h, to complete the molding of the metal fiber braided mesh resin flow distributor.

[0042] Apply a release agent on the surface of the metal fiber woven mesh resin flow distributor, and then spread a piece of polytetrafluoroethylene plain cloth with a thickness of 0.2mm on...

Embodiment 3

[0046] Adopt the vacuum bag forming method of the present invention to prepare composite material plate parts, the metal fiber diameter of the selected metal fiber braided net resin flow distributor surface layer is 0.2mm, the mesh number is 500 mesh, and the thickness is 0.4mm; The diameter of the metal fiber is 0.5mm, the mesh number is 100 mesh, and the thickness is 1mm.

[0047] Fit the supporting layer of the selected metal braided mesh resin flow distributor to the surface of the flat mold, and use a flat tooling with the same size as the mold surface to apply pressure to the metal fiber braided mesh resin flow distributor to make it fit tightly On the surface of the mold, the pressurization range is 1.5MPa, and the holding time is 4h to complete the molding of the metal fiber braided mesh resin flow distributor.

[0048] Apply a release agent on the surface of the metal fiber woven mesh resin flow distributor, and spread a piece of polytetrafluoroethylene twill cloth of...

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Abstract

The invention belongs to the technical field of resin group composite material liquid moulding manufacture, and relates to a composite material vacuum bag forming method. According to the composite material vacuum bag forming method provided by the invention, a multilayer metal fiber mesh grid can be used as a rigid resin flow distributor, and technologic advantages such as resin film impregnation molding (RFI), vacuum auxiliary resin impregnation molding (VARI) and vacuum bag autoclave molding (Autoclave) are combined; the composite material vacuum bag forming method can be used for effectively promoting resin to flow along the thickness direction of a fiber perform body so as to guarantee the structural support of the preform body, and overcoming the disadvantages that a large-area composite material liquid moulding workpiece brought by the flexible distributor is low in superficial dimension precision and poor in thickness uniformity at present; and the moulding efficiency and dimensional accuracy of the composite material workpiece are improved, and a more rapid, more flexible and low-cost liquid molding technical scheme for manufacturing a high-performance composite material structure piece is provided.

Description

technical field [0001] The invention belongs to the technical field of liquid forming and manufacturing of resin-based composite materials, and relates to a composite material vacuum bag forming method. Background technique [0002] Resin film infiltration molding (RFI) technology is a vacuum bag forming technology for composite parts using a single-sided mold (hereinafter referred to as "half mold"). It places a resin film under the reinforced fabric preform and uses vacuum The bag forms a partial vacuum and the pressure field inside the bag realizes the short-range flow and impregnation of the resin along the thickness direction of the preform, which is suitable for the molding of large-scale wallboard composite parts. However, RFI molding requires a specific medium-viscosity base resin and prepares it into a film form. [0003] As far as the use of half molds and vacuum bags is concerned, the traditional autoclave molding (Autoclave) is very similar to the RFI molding te...

Claims

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Application Information

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IPC IPC(8): B29C70/44B29C70/54
Inventor 刘刚李伟东安学锋益小苏
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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