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Method for forming composite material by matched mold

A technology of composite materials and counter molding, which is applied in the field of counter molding composite materials, which can solve problems such as insufficient density and uneven surface of composite materials, and achieve the effects of no mold joint, high product quality, and avoiding material inclusions

Inactive Publication Date: 2014-03-12
HARBIN FRP INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problems of uneven surface and insufficient density of composite materials formed by existing methods, and provides a method for molding composite materials

Method used

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  • Method for forming composite material by matched mold
  • Method for forming composite material by matched mold

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specific Embodiment approach 1

[0012] Embodiment 1: In this embodiment, a method for molding composite materials is carried out according to the following steps:

[0013] 1. Lay a composite material prepreg layer on the surface of the inner mold on the lower mold of the metal mold, and evenly lay expansion rubber on the outside of the composite material prepreg layer; The mold ring fits the outer mold tightly, and the upper mold is tightly covered to obtain the packaged mold; 3. Put the packaged mold in step 2 into the curing furnace, and first cure it at a temperature of 90°C to 100°C for 2 hours to 3h, then cured at a temperature of 120°C to 130°C for 4h to 5h, and finally cured at a temperature of 150°C to 160°C for 2h to 3h to obtain a cured mold; The final mold is taken out, cooled to room temperature, and demolded to obtain a molded composite material. The expansion rubber described in step one is silicon rubber or fluororubber; The expansion coefficient of the expansion rubber described in step one ...

specific Embodiment approach 2

[0016] Embodiment 2: This embodiment differs from Embodiment 1 in that the expansion rubber described in Step 1 is silicone rubber. It is the same as the first embodiment.

specific Embodiment approach 3

[0017] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the expansion coefficient of the expansion rubber described in step one is 2×10 -4 / °C. Others are the same as those in Embodiment 1 or 2.

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Abstract

The invention discloses a method for forming a composite material by a matched mold, aiming to solve the problems that a composite material formed by an existing method is uneven in surface and insufficient in compactness. The method comprises the following steps: firstly, laying a prepreg layer of the composite material on the surface of an inner mold on a lower mold of a metal mold, and laying expansion rubber uniformly on the outer layer of the prepreg layer of the composite material; secondly, combining an outer mold with the outer layer of the expansion rubber, and combining the outer mold closely at the outer side of the outer mold by a mold combining ring, and covering the upper mold tightly, thereby obtaining the packaged mold; and thirdly, putting the packaged mold in the second step into a curing furnace, curing, then taking the mold out, cooling to room temperature, and demolding, thereby obtaining the formed composite material. The method is used for forming the composite material.

Description

technical field [0001] The invention relates to a method for molding composite materials. Background technique [0002] Composite molding processes mainly include pultrusion process, winding process, wet laying process, RTM process, etc. As a kind of wet lay-up process, the mold forming process is more classic. The mold design is a metal mold. The metal mold has good dimensional stability and temperature resistance, especially in composite thick-walled products and high-temperature curing resin systems. During the forming process, the metal mold has high rigidity and strength. However, its disadvantage is that in the process of preparing cylindrical composite products with metal molds as rigid molds, the inner surface of the composite material cylinder may have defects such as rich resin or uncompacted, and the outer surface is easy to be sandwiched during the mold closing process or the surface layer will be hooped to the fibers. Buckling, unable to give full play to its ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C70/48B29C70/34
CPCB29C70/345
Inventor 王非栾世琳匡乃航梁钒孙云龙
Owner HARBIN FRP INST
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