Compression molding method for thickness-adjustable composite material pre-impregnated woven cloth

Abstract

The invention discloses a thickness-adjustable composite prepreg woven fabric compression molding method, which adopts a general pressing mold for molding, and the general pressing mold comprises an upper mold and a lower mold; a working molded surface matched with the inner shape of a partition plate product is processed at the lower end of the upper die, and a working molded surface matched with the maximum thickness shape of the partition plate product is processed at the upper end of the lower die; when the method is used for pressing, the mass of a needed filling agent is calculated according to the volume difference between a partition plate product to be pressed and a partition plate product with the maximum thickness, and then the filling agent with the corresponding mass is put into an inner cavity of a lower mold; and after the partition plate product to be pressed and the filling agent are cured and formed and demolding is conducted, the cured filling agent is crushed, and the partition plate product obtained after mold pressing is obtained. According to the compression molding method, combustion chamber partition plates or other special-shaped molded bodies with the same caliber, the same inner shape and different thicknesses can be machined through the same mold.

Description

Technical Field

[0001] The invention belongs to the technical field of composite material molding, and in particular relates to a method for molding composite material prepreg woven cloth with adjustable thickness. Background Art

[0002] Compression molding is an important molding method for composite prepreg woven fabrics. The thickness of the prepreg woven fabric after curing usually depends on the mold size during molding.

[0003] The molded baffles in a certain charge combustion chamber feature a central hemispherical support structure with an annular support at the edge. Baffles of the same caliber and different operating pressures have consistent internal dimensions but varying thicknesses. This requires using different molds to match the corresponding dimensions, increasing processing costs and reducing efficiency. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for molding composite material prepreg woven cloth with adjustable thickness in order to solve the problem that different molds are required for molding partitions of the same series but different thicknesses.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] The present invention provides a method for compression molding a composite material prepreg woven fabric with adjustable thickness. The method adopts a universal pressing mold, wherein the universal pressing mold comprises an upper mold and a lower mold; the lower end of the upper mold is processed with a working surface that matches the inner shape of the partition product, and the upper end of the lower mold is processed with a working surface that matches the outer shape of the maximum thickness in the partition product;

[0007] The specific forming steps of this method are as follows:

[0008] 1) laying carbon fiber and glass fiber composite pre-impregnated woven fabric on the working surface of the upper mold according to the thickness of the separator product to be pressed to obtain a preform;

[0009] 2) Calculating the required mass of filler based on the volume difference between the separator product to be pressed and the separator product with the maximum thickness, and then placing the corresponding mass of filler into the lower mold cavity; the filler is talcum powder;

[0010] 3) The upper mold and the lower mold are closed so that the filler fills the remaining space of the mold working cavity, and the partition product to be pressed and the filler are solidified and formed by heating and pressurizing. After demolding, the solidified filler is crushed to obtain the molded partition product.

[0011] Beneficial effects

[0012] The compression molding method of the present invention can use the same mold to process combustion chamber partitions or other special-shaped molded bodies with the same caliber, the same inner shape, and different thicknesses, thereby improving the use efficiency of the mold, reducing the mold investment output, and lowering the mold cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the compression mold used in the compression molding method of the present invention;

[0014] In the figure, 1- separator product to be pressed, 2- filler, 3- upper mold, 4- lower mold. DETAILED DESCRIPTION

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Example

[0017] The present invention provides a method for molding a composite material prepreg woven cloth with adjustable thickness. The method of the present invention takes the preparation of composite material partitions with thicknesses of 7mm, 5mm, and 3mm for a 122mm caliber combustion chamber as an example. The method adopts a universal pressing mold for molding, such as Figure 1 As shown, the universal pressing mold includes an upper mold 3 and a lower mold 4; the lower end of the upper mold 3 is processed with a working surface that matches the inner shape of the partition product, and the upper end of the lower mold 4 is processed with a working surface that matches the maximum thickness of the partition product;

[0018] The specific forming steps of this method are as follows:

[0019] 1) According to the thickness of the separator product 1 to be pressed, a carbon fiber and glass fiber composite pre-impregnated woven fabric is laid on the working surface of the upper mold 3 to obtain a preform;

[0020] 2) Calculate the required filler mass based on the volume difference between the separator product 1 to be pressed and the separator product with the largest thickness, and then place the corresponding mass of filler 2 into the inner cavity of the lower mold 4; the filler 2 is talcum powder, and 200g, 150g, and 100g of talcum powder are placed in the composite separators of three thicknesses, respectively;

[0021] 3) The upper mold 3 and the lower mold 4 are combined to fill the remaining space of the mold working cavity with the filler 2. The temperature is raised to 140°C and the pressure is increased to 20 MPa. The temperature and pressure are maintained for 30 minutes. After demolding, the solidified filler 2 is crushed to obtain a molded partition product.

Claims

1. A method for molding a composite material prepreg woven cloth with adjustable thickness, characterized in that: The method adopts a universal pressing mold, which includes an upper mold and a lower mold; the lower end of the upper mold is processed with a working surface that matches the inner shape of the partition product, and the upper end of the lower mold is processed with a working surface that matches the maximum thickness of the partition product. The specific forming steps of this method are as follows: 1) laying carbon fiber and glass fiber composite pre-impregnated woven fabric on the working surface of the upper mold according to the thickness of the separator product to be pressed to obtain a preform; 2) Calculating the required mass of filler based on the volume difference between the separator product to be pressed and the separator product with the maximum thickness, and then placing the corresponding mass of filler into the lower mold cavity; the filler is talcum powder; 3) The upper mold and the lower mold are closed so that the filler fills the remaining space of the mold working cavity, and the partition product to be pressed and the filler are solidified and formed by heating and pressurizing. After demolding, the solidified filler is crushed to obtain the molded partition product.

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