Bag compression resin transfer molding (RTM) mold, device and method

Abstract

The invention relates to a bag compression resin transfer molding (RTM) mold, device and method. The bag compression RTM mold comprises an outer mold and further comprises an upper mold, a lower mold,an air bag and a guiding piece which are located in the outer mold; the upper mold is of a convex block structure, and the lower mold is of a groove structure, wherein the convex block structure andthe groove structure are mutually matched; the lower mold is located blow the upper mold, the air bag is located below the lower mold, the guiding piece is used for limiting the movement direction ofthe lower mold to the up-down direction, communicating resin inlets are formed in the upper mold and the outer mold, a vacuum pump connector and an air inlet which is connected with an air bag inlet are formed in the outer mold, and a resin outlet is formed in the lower mold. The device is composed of the molding mold, an air storage tank, a vacuum pump, a pressure tank and a heating deice. The method comprises the steps: a reinforced material is placed into the mold to be heated firstly, then a closed space between the upper mold and the lower mold is vacuumized and then fully filled with resin, then when heating is conducted to a resin gel point, the air bag is inflated to compress the lower mold, and finally curing and demolding are conducted. The molding mold and device are simple in structure, and the production efficiency of the method is high.

Description

technical field [0001] The invention belongs to the technical field of reinforced composite materials, and relates to a bag compression resin transfer molding mold, a molding device and a molding method. Background technique [0002] In petrochemical, machinery manufacturing and other fields, the lightweight of complex structural components has become the focus of research in recent years. Reinforced composite materials have the characteristics of high specific strength, high modulus, corrosion resistance, fatigue resistance, creep resistance, good design and large-area integral molding. Therefore, replacing metal materials with reinforced composite materials is an effective way to achieve lightweight parts, and it has received more and more attention. [0003] Resin transfer molding technology (Resin Transfer Molding, RTM) is a typical non-autoclave low-cost material preparation technology. Its main advantage is that it can manufacture high-precision complex configuration ...

AI Technical Summary

Problems solved by technology

In the prior art, this kind of process is often used in the production of reinforced composite products. The molds used in the production of reinforced composite materials in the prior art are as follows: figure 1 As shown, it is mainly composed of an upper mold 2, a lower mold 3, a sealing ring 19 and an injection tube 20. The upper mold 2 and the lower mold 3 are groove structures that cooperate with each other. The upper mold 2 and the lower mold 3 are provided with grooves The opening surfaces are fitted together to form a closed cavity, and the volume of the closed cavity formed between the upper mold 2 and the lower mold 3 is fixed during injection molding, and the volume content of the reinforced composite material 10 cannot be changed by applying external pressure in the later stage. The molding process sometimes requires the preparation of preforms, and the permeability of the preforms is small. In addition, the operation of RTM is difficult, the injection time is long, the efficiency is low, and the gas brought in during the injection process is difficult to remove. The requirements of high performance, high efficiency and low cost of materials are not conducive to the production and manufacture of more types of composite joints

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