JPH02125705A - Molding method for fiber-reinforced composite material - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention A0 Object of the Invention (1) Industrial Application Field The present invention relates to a material used for manufacturing a fiber-reinforced composite consisting of a synthetic resin matrix and reinforcing fibers dispersed in the synthetic resin matrix. Concerning a molding method.

(2) Conventional technology Conventionally, when molding the above-mentioned materials, the reinforcing fibers are adsorbed to the surface of the mold by applying suction to the back side of the breathable mold, and then the synthetic resin is attached to the adsorbed fiber group. Techniques such as spraying matrix powder have been adopted.

(3) Problems to be Solved by the Invention However, when the above-mentioned method is adopted, it is sometimes difficult to spray the powder for the synthetic resin matrix, and it is difficult to uniformly disperse and retain the powder over the entire group of adsorbed fibers. As a result, problems such as the powder being unevenly distributed on the surface side of the adsorbed fiber group or easily falling off may occur, which may make it impossible to obtain a high-quality composite.

In view of the above, an object of the present invention is to provide the above-mentioned molding method that can obtain the above-mentioned material in which the powder for a synthetic resin matrix is uniformly dispersed throughout.

B1 Structure of the invention (1) Means for solving the problem The present invention provides a method for molding a material used for manufacturing a fiber-reinforced composite consisting of a synthetic resin matrix and reinforcing fibers dispersed in the synthetic resin matrix. First, a molding material is prepared by uniformly mixing the synthetic resin matrix powder and the reinforcing fibers, and then the molding material is transferred to the mold by applying suction to the back side of the breathable mold. It is characterized by being adsorbed to the surface of.

(2) Effects According to the method described above, a material in which the synthetic resin matrix powder is uniformly dispersed throughout can be obtained by adsorption of the molding material to the mold.

(3) Example 1. FIG. 2 shows a box-shaped fiber-reinforced composite 1 consisting of a synthetic resin matrix, such as nylon, and reinforcing fibers, such as carbon fibers, dispersed in the synthetic resin matrix.

In manufacturing the fiber-reinforced composite 1, a box-shaped material 2 is used as shown in FIG.

Hereinafter, the forming operation of the material 2 by the forming apparatus 3 shown in FIG. 4 will be explained.

The molding device 3 includes a molding material storage tank 7 with an open top, and a suction box 8 that is arranged above the tank 7 and moves up and down. Hanged. The mold 9 is inserted into and removed from the tank 7 through its opening 10 as the suction box 8 moves up and down. The space on the back side of the mold 9 and the inside of the suction box 8 are partitioned by a rectifying plate 12 having numerous ventilation holes 11, and a connecting tube 13 protruding from the side of the suction box 8 is connected to a suction fan 15 via a duct 14.
connected to.

A molding material 16 is charged into the tank 7, and the molding material 1
6, chopped fiber type reinforcing fibers 17 and synthetic resin matrix powder 1, as shown in FIG.
It is prepared by uniformly mixing 8 and 8.

The mold 9 has a mesh shape, and the size of the mesh is set smaller than the diameter of the powder 18.

During the molding operation, as shown in FIG. 6(a), the suction box 8 is lowered, the mold 9 is placed in the tank 7, and the suction fan 15 is activated to apply suction to the back side of the mold 9. give. In this case, due to the rectifying action of the rectifier plate 12, the mold 9
The suction effect is applied almost evenly to the entire back surface of the

As a result, the molding material 16 in the tank 7, and therefore the reinforcing fibers 17 and the powder 18, are adsorbed together to the surface of the mold 9, and this adsorption work allows the powder 18 to be uniformly dispersed and held throughout the entire surface. A raw material 2 is obtained.

Thereafter, under the same suction action as described above, the suction box 8 is raised as shown in FIG. The material 2 is sprayed using a spray gun G to impart shape retention, and then the suction action is stopped to release the material 2 from the mold.

After demolding, the raw material 2 is subjected to low-temperature heat treatment to harden the synthetic resin binder b, thereby making the raw material 2 easier to handle.

Next, the production of the fiber-reinforced composite 1 will be explained with reference to FIGS. 7(a) to 7(e).

As shown in FIG. 7(a), a box-shaped lower backing plate 19 having a flange portion 19a, a box-shaped lower light plate 20 having a flange portion 20a, and both flange portions 19a, 2Oa.
The frame-shaped spacer 21 sandwiched between them was heated at 250°C for 40 minutes.
Heat for a minute.

As shown in FIG. 7, etc., three pieces of material 2 are sandwiched between the lower patch plate 19 and the lower patch plate 20, and a spacer 21 is sandwiched between both flanges 19a and 2Oa. The laminate 22 is preheated at 250° C. for 40 minutes.

As shown in FIG. 7(C), the laminate 22 is
Fixed upper mold 23 and movable lower mold 2 heated to 0°C
4 and press the lower mold 24 against the upper mold 23 with a pressure of 20 kg/cd to perform cold pressing. By this cold pressing, the entirety of each material 2 is impregnated with the melted powder 18 to bond the fibers together, thereby forming the fiber reinforced composite 1, and cooling is performed at the same time. In this case, since the powder 18 is uniformly dispersed throughout each material 2, the impregnation is efficiently performed.

As shown in FIG. 7(d), the laminate 22 is released from the mold.

As shown in Figure 7(e), the upper and lower backing plates are 19°20
Then, the spacer 21 is removed from the fiber-reinforced composite 1.

Effects of the C0 Invention According to the present invention, it is possible to easily and stably mold a fiber-reinforced composite material in which the synthetic resin matrix powder is uniformly dispersed throughout. Further, since only the suction operation is performed, the manufacturing process can be simplified, mass productivity can be improved, and manufacturing costs can be reduced.

[Brief explanation of drawings]

1st. Figure 2 shows a fiber-reinforced composite, Figure 1 is a perspective view, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, Figure 3 is a perspective view of the material, and Figure 4 is a longitudinal side view of the molding device. 5 is an enlarged explanatory diagram of the molding material, FIG. 6 is an explanatory diagram of the molding process of the raw material, and FIG. 7 is an explanatory diagram of the manufacturing process of the fiber reinforced composite. DESCRIPTION OF SYMBOLS 1... Fiber reinforced composite, 2... Material, 9... Molding mold, 16... Molding material, 17... Reinforcing fiber, 18
... Powder for synthetic resin matrix

Claims (1)

[Claims] When molding a material used for manufacturing a fiber-reinforced composite consisting of a synthetic resin matrix and reinforcing fibers dispersed in the synthetic resin matrix, the powder for the synthetic resin matrix and the reinforcing fibers are uniformly mixed. Molding of a material for a fiber-reinforced composite, characterized in that a molding material is prepared by mixing, and then the molding material is adsorbed to the surface of the mold by applying suction to the back side of an air-permeable mold. Method.