Simple flexible pressure equalizing pad for hot press molding of composite material and application thereof

A composite material and thermoforming technology, applied in synthetic resin layered products, layered products, chemical instruments and methods, etc., can solve the problems of uneven pressure on parts, complex manufacturing process, long preparation cycle, etc. The effect of surface smoothness, low production cost, and short production cycle

Pending Publication Date: 2020-02-21
航天海鹰(镇江)特种材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of metal or rubber pressure pads mainly has the following problems: (1) The cost of metal pressure pads is relatively low, but they need to be preformed, and their shape is relatively poor. Uneven pressure during curing, or local resin-rich, surface damage and other problems; (2) When manufacturing rubber pressure pads, it is necessary to manufacture pressure pad molding tools, use rubber and internal reinforcing fibers to cure the corresponding profile, and have good conformability , but the cost is high, the manufacturing process is complicated, and the rubber is easily oxidized at high temperature. After being put into the tank many times, there are problems such as deformation and surface damage, which affect the quality of the parts and can be reused less often
Therefore, when using the traditional pressure pad solution to manufacture parts, the preparation process is relatively complicated, the preparation cycle is long, the cost is high, and the later maintenance is inconvenient. These shortcomings are especially obvious when manufacturing simple flat or curved surface parts.

Method used

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  • Simple flexible pressure equalizing pad for hot press molding of composite material and application thereof
  • Simple flexible pressure equalizing pad for hot press molding of composite material and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This implementation is a simple and flexible pressure equalizing pad used for hot pressing of composite materials, such as figure 1 As shown, it includes a release cloth layer 1 and a fiber cloth layer 2, and the release cloth layer 1 is laid on the fiber cloth layer 2 to form a simple flexible pressure equalizing pad 3. Wherein, the release cloth layer 1 is a single-sided rubberized PTFE release cloth, and the rubberized surface is laid on the fiber cloth layer 2; the fiber cloth used in the fiber cloth layer 2 is dry polyester peelable cloth. In some embodiments, a separate polyester peelable cloth can be used to directly cover the prepreg of the composite material, but because it is easy to absorb resin, the thickness of the molded part becomes thinner and the composite material is reduced. Qualified rate. In this implementation, a layer of PTFE release cloth is added on the side where the dry polyester peelable cloth is in contact with the composite prepreg, which ef...

Embodiment 2

[0028] This embodiment provides an application of the simple flexible pressure equalizing pad described in Embodiment 1, which is mainly used to assist the forming process of a composite material part autoclave, and includes the following steps:

[0029] 1) Covering the pressure equalization pad: spread the release cloth layer 1 of the simple flexible pressure equalization pad 3 described in Example 1 on the composite preformed part 4 with one side facing down;

[0030] 2) Cutting: According to the profile and size of the composite material pre-formed part 4, cut the simple flexible pressure equalizing pad 3 described in step 1 at the corners of the part, the curvature change area, etc., and use pressure-sensitive tape for splicing Fixed to ensure that the simple flexible pressure equalizing pad 3 can completely cover the surface of the composite material preformed part 4;

[0031] 3) Encapsulation: Use the vacuum bag 5 and the sealing tape 6 to encapsulate the composite material pre...

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PUM

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Abstract

The invention discloses a simple flexible pressure equalizing pad for hot press molding of a composite material and application thereof. The simple flexible pressure equalizing pad comprises a demolding cloth layer and a fiber cloth layer, wherein the demolding cloth layer is laid and attached to the fiber cloth layer. The simple flexible pressure equalizing pad is mainly used for assisting the molding process of a composite material part autoclave. Compared with a traditional pressure pad, the simple flexible pressure equalizing pad is simple in structure, low in manufacturing cost and shortin preparation period; and the flexibility of the simple flexible pressure equalizing pad is better than that of the pressure pad, the matching degree of the simple flexible pressure equalizing pad and a composite material part in the auxiliary molding process is good, and the surface smoothness of the composite material part after molding is better guaranteed.

Description

Technical field [0001] The invention relates to a simple and flexible pressure equalizing pad used for hot pressing of composite materials and its application. Background technique [0002] Resin-based carbon fiber composite materials have high specific strength, high specific stiffness, strong designability, good fatigue fracture resistance, corrosion resistance, and good dimensional stability. It is currently widely used in aviation, aerospace, transportation and other fields. High-performance structural materials. Among the various carbon fiber composite material molding processes, the autoclave process has uniform molding temperature and pressure, and has good adaptability to parts of different materials, shapes, sizes, and structures. Therefore, it has become a research and manufacturing aerospace high-quality composite One of the main processing methods of material components. [0003] When using the autoclave process to form composite parts, due to the high pressure in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/44B29C70/54B32B27/02B32B27/12B32B27/32B32B27/36B32B7/12
CPCB29C70/44B29C70/54B32B5/02B32B5/26B32B7/12B32B2262/0253B32B2262/0276
Inventor 周娴马秀菊郭渊倪敏轩黎玉钦胡灯灯
Owner 航天海鹰(镇江)特种材料有限公司
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