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Vacuum assisted molding system of composite and molding method of composite

A composite material and vacuum-assisted technology, applied in the field of forming systems, can solve the problems of low mold versatility and high process cost, and achieve the effects of less internal defects, good mechanical properties, and reduced equipment costs and manufacturing costs.

Inactive Publication Date: 2012-11-07
NAT UNIV OF DEFENSE TECH
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  • Abstract
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Problems solved by technology

However, this mold not only needs to design vacuum holes, but also needs to design high-precision sealing grooves to ensure the sealing effect after the mold is closed. The mold has low versatility and high process cost.

Method used

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  • Vacuum assisted molding system of composite and molding method of composite

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Embodiment

[0024] a kind of like figure 1 The vacuum-assisted compression molding system for composite materials shown, the system includes an open molding mold, the open molding mold includes an upper mold 1 and a lower mold 2 arranged oppositely, and a prepreg 5 to be formed is sealed and connected above the lower mold 2 A vacuum bag pressure system that implements vacuum bag pressure; the outer side of the open forming mold is connected with a mold pressing heating system (including hydraulic press upper 3 and hydraulic press lower 4). In this embodiment, the upper mold 1 and the lower mold 2 are single-sided molds, and the length and width of the upper mold 1 are the same as the length and width of the product to be formed; the edges of the lower mold 2 exceed the edges of the prepreg 5 placed on it The distance is more than 30mm. After the upper mold 1 and the lower mold 2 are closed, they do not touch or close.

[0025] The vacuum bagging system of the present embodiment includes...

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Abstract

The invention discloses a vacuum assisted molding system of a composite, which comprises an open shaping mold comprising an upper mold and a lower mold, wherein a vacuum bag-pressing system is connected on the lower mold in a sealing manner; and a mold-pressing heating system is connected outside the mold. The invention also discloses a method for shaping a composite article by vacuum assisted molding, which comprises the following steps: preparing the open shaping mold and placing a prepreg on the lower mold, paving an isolating film, a piece of mold releasing cloth, and a breathable felt in turns, connecting a vacuum bag film in a sealing manner, and communicating a formed vacuum bag-pressing cavity with a vacuum pump; connecting the upper mold and the lower mold to the mold-pressing heating system; assembling the upper mold and the lower mold under a condition of keeping a vacuum bag pressing status, molding and pressing the prepreg by the mold-pressing heating system and heating the upper mold and the lower mold at the same time, and carrying out curing treatment after reaching a curing temperature; and after finishing the curing reaction, molding to obtain the composite article. According to the invention, the process cost is low, the generality is high, the consumption of auxiliary materials is little, and the use performance of the product can be improved.

Description

technical field [0001] The invention belongs to the technical field of composite material forming technology, and in particular relates to a forming system and a forming method for improving the internal and surface quality of prepreg molded products. Background technique [0002] Vacuum-assisted compression molding system is a low-cost manufacturing technology that uses the combined action of vacuum negative pressure and molding pressure to prepare prepregs. Vacuumizing to form a negative pressure inside the molding system is a key factor to improve the internal quality of the product; applying external pressure is a key factor to increase the reinforcement content and resin density in the product. Therefore, the process of combining vacuum pumping and molding is an important technology to improve the performance of composite products. [0003] The traditional vacuum bagging process using vacuum negative pressure to prepare and form can obtain composite products with bette...

Claims

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Application Information

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IPC IPC(8): B29C70/34B29C70/54
Inventor 彭超义李仕通杨明敏肖加余曾竟成邢素丽尹昌平
Owner NAT UNIV OF DEFENSE TECH
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