Forming device and forming method of a polymer-based composite material

Abstract

The invention discloses a forming device and a forming method for a polymer matrix composite material. The forming device comprises an injection system, a mould system and a vacuum system, wherein the mould system comprises a forming mould, a semi-permeable mould cavity and a bag film mould cavity; the forming mould comprises a female mould, a male mould and a forming mould cavity; a glue discharging hole and a glue filling hole are formed in the upper end and the lower end of the forming mould cavity respectively; the glue filling hole is connected with the forming mould cavity and the injection system; the glue discharging hole is connected with the forming mould cavity and the semi-permeable mould cavity; the semi-permeable mould cavity is wrapped with the bag film mould cavity and connected with the vacuum system through a gas channel; the semi-permeable mould cavity is packaged by adopting a semi-permeable film I and a sealing adhesive tape I; the semi-permeable film I is a thin film permeable by gas but impermeable by resin glue. The forming method can effectively avoid bubble defects, the cost is low, the quality is stable and uniform, one-step integral forming is realized, the process efficiency is high, the product quality is good, bubbles generated in a preparation process can be discharged in real time, and a high-performance composite product with characteristics of full dipping, uniform fiber distribution and smooth double surfaces is prepared.

Description

Technical field [0001] The invention relates to a device and a method for preparing composite materials, in particular to a device and a method for forming polymer-based composite materials. Background technique [0002] Polymer-based composite materials are widely used in aerospace, energy, rail transit and other fields because of their high specific strength, high specific modulus, designable performance, light weight and high strength. Preparation is the key to the ultimate realization of the superior performance of composite materials. For this reason, scholars at home and abroad have developed a series of composite material preparation technologies. Typical examples are hand lay-up, molding, autoclave, winding, pultrusion, and automatic wire laying. / Tape laying technology and liquid phase forming technology, etc. Autoclave and automatic silk laying / tape laying technology belong to prepreg molding technology: the fiber is pre-impregnated, fully impregnated, uniformly distri...

AI Technical Summary

Problems solved by technology

[0003] Although the liquid phase molding technology has the advantages of high performance and low cost, it is difficult to remove the bubbles generated during the preparation process, which may easily lead to defects in composite products.

In addition, the current typical liquid-phase forming technologies still have their own shortcomings: (1) The RFI process requires heating infiltration and a special resin film, and can only produce composite products with one-sided smoothness; (2) ) RTM (its technological process such as Figure 5 As shown) the process can prepare double-sided smooth composite products, but it is difficult to ensure that the resin fully infiltrates the reinforcing material and avoids bubble defects; (3) the VIMP process uses vacuum negative pressure to infuse the resin, and the ultimate infusion pressure cannot exceed one atmosphere, so the resin The infusion speed and the infiltration effect of the resin on the reinforcing material will be limited, and only one-sided smooth composite products can be prepared

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