RTM product and preparation method thereof
A product and three-dimensional technology, applied in the field of RTM products and their preparation, can solve the problems of difficult resin penetration, fiber sinking, and affecting the overall performance of the product, so as to reduce the impact and improve the success rate
Active Publication Date: 2016-12-21
XIANNING HAIWEI COMPOSITE MATERIAL PROD
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Problems solved by technology
However, when forming special-shaped parts with non-equal thickness and uniform distribution, the number of fiber layers at each position is directly related to the thickness of the product, while for special-shaped parts, the thickness of the product is non-uniform, and the surface is in a state of gradual transition, so it is difficult to control the accuracy of fiber laying design , it is easy to cause too much local fiber laying, too tight extrusion between fiber cloth layers, resulting in difficult penetration of resin, that is, forming a dry area, or too little local fiber amount, fiber sinking, and pure resin accumulation on the surface layer, that is, forming a rich rubber area, while pure resin has poor strength and is easily broken, which affects the overall performance of the product
Method used
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[0022] The present invention will be further described below in conjunction with accompanying drawing.
[0023] like figure 1 Shown is the conventional lay-up plan for special-shaped parts in the prior art. The mold 1 is cleaned according to the requirements of the RTM process, and the fiber cloth 2 is laid on the mold according to the design requirements of the lay-up. When forming a special-shaped part with uneven thickness, It is impossible for each layer of cloth to perfectly fit the size of the product;
[0024] When the local fiber cloth 2 layer is too thick, the wettability of the resin is poor, and dry spots and dry areas appear;
[0025] When the local fiber cloth layer is too thin, the resin content is too high, and the rubber-rich area appears;
[0026] Regardless of whether it is the dry area or the rubber-rich area, the unbalanced ratio of resin to fiber will seriously affect the quality of the final RTM product and make its performance worse.
[0027] see fi...
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Abstract
The invention provides a RTM product which comprises a fiber cloth layer. The RTM product is characterized in that the fiber cloth layer internally comprises three-dimensional sandwich knitted fabrics; the three-dimensional sandwich knitted fabrics are sequentially arranged into a compact orthogonal fiber cloth layer, a vertical fluffy fiber layer and a compact orthogonal fiber cloth layer; and the three-dimensional sandwich knitted fabric is arranged in the middle of the fiber cloth layer. The RTM product has the beneficial effects that: 3D cloth in an RTM forming process is used, so that the condition that a specially-shaped part is locally too thin or too thick during layer design can be avoided, a success rate of spherically-shaped part products can be increased, and influences, caused by unreasonable layer design, on products are reduced, and therefore, quality of boards prepared by the RTM forming process can reach optimum level.
Description
technical field [0001] The technical field of the invention relates to the application of three-dimensional sandwich fabrics in RTM technology. Background technique [0002] Advanced resin-reinforced fiber composite materials have excellent performance and broad application prospects. They are widely used in aviation, aerospace, ships, automobiles, high-speed rail and other fields. Among the various molding processes of such materials, the RTM molding process has the advantages of small trimming of molded products, With the advantages of high dimensional accuracy, stable product quality, and high production efficiency, it is the preferred molding process for special-shaped batch products. [0003] The RTM molding process is a composite material production process in which the reinforced fabric is placed in the mold to form a certain shape, then the mold is closed, and the resin is injected into the mold, impregnated with fibers and cured. It is one of the main molding proces...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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IPC IPC(8): B29C70/24B29C70/48
CPCB29C70/24B29C70/48
Inventor 鲁程程久益谢文奇冷巍
Owner XIANNING HAIWEI COMPOSITE MATERIAL PROD