Two-time compression molding technology for thermoplastic composite material

Abstract

The invention discloses a two-time compression molding technology for a thermoplastic composite material. The two-time compression molding technology includes the following steps that a preset prepreg sheet material is selected; the relationship between the layer number of the preset prepreg sheet material and the expected thickness of a formed tablet is estimated according to related parameters of the prepreg sheet material; a matched first-time formed tablet mould is designed according to the expected thickness of the formed tablet; the prepreg sheet material is cut and put in the mould, and an intermediate product thermoplastic composite material tablet is manufactured after heating and pressure application; the obtained composite material tablet is put into heating equipment to be fully pre-heated and then rapidly transferred to a product mold; after a composite material tablet blank is evenly laid on the mold, pressure is applied for product forming and kept for a period, and the composite material tablet is taken out after being cooled, so that the thermoplastic composite material product is obtained. The two-time compression molding technology for the thermoplastic composite material has the beneficial effects that the cost is lowered; the prepreg sheet material is laid evenly, uniform in thickness and low in porosity, and application and popularization in the market are facilitated.

Description

technical field [0001] The invention relates to a secondary molding technology of thermoplastic composite materials. Background technique [0002] In recent years, thermoplastic composite materials are a new type of material and structure after thermosetting composite materials, especially high-performance thermoplastic composite materials, that is, thermoplastic composite materials represented by continuous glass fiber reinforced polyphenylene sulfide. Outstanding advantages such as impact resistance, fatigue resistance and lighter weight are increasingly used in aircraft structural parts such as the leading edge of the wing; however, due to the high molding temperature of polyphenylene sulfide (above 300 ° C), its The process is relatively complicated and the cost is high, so a low-cost molding technology is sought to lay the foundation for the low-cost application of high-performance thermoplastic composite materials in aerospace load-bearing / sub-load-bearing components, ...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a secondary compression molding technology for thermoplastic composite materials to overcome the serious mold loss, high cost, difficulty in uniform laying of prepreg sheets, difficult control of molding pressure, and uneven thickness in the primary compression molding process. problems such as uniformity and high porosity, and this technology not only reduces the cost, improves the control difficulty of the process window, but also improves the mechanical properties of the components

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