JP2516802B2 - Method for molding material for fiber-reinforced composite - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A. Object of the Invention (1) Field of Industrial Application The present invention is used for producing a fiber-reinforced composite comprising a synthetic resin matrix and reinforcing fibers dispersed in the synthetic resin matrix. The present invention relates to a method of forming a material.

(2) Conventional Technology Conventionally, in the case of molding the above-mentioned material, the reinforcing fiber is adsorbed on the surface of the molding die by giving a suction action to the back surface side of the breathable molding die, and then the synthetic fiber is adhered to the adsorption fiber group. The method of spraying powder for matrix is adopted.

(3) Problems to be Solved by the Invention However, when the above-mentioned method is adopted, it is difficult to uniformly disperse and hold the powder for the synthetic resin matrix throughout the adsorption fiber group when the powder is sprayed. As a result, the powder may be unevenly distributed on the surface side of the adsorbing fiber group, or may easily fall off, and it may not be possible to obtain a high-quality composite.

In view of the above, it is an object of the present invention to provide the molding method capable of obtaining the raw material in which the powder for synthetic resin matrix is uniformly dispersed and held all over.

B. Structure of the Invention (1) Means for Solving the Problems The present invention molds a material used in the production of a fiber-reinforced composite consisting of a synthetic resin matrix and reinforcing fibers dispersed in the synthetic resin matrix. At this time, the synthetic resin matrix powder and the reinforcing fibers are uniformly mixed to prepare a molding material, and then the back surface side of the breathable molding die is subjected to a suction action to form the molding material into the molding material. It is characterized by being adsorbed on the surface of the mold.

(2) Action According to the above-mentioned method, the material in which the powder for the synthetic resin matrix is uniformly dispersed and held over the whole is obtained by the operation of adsorbing the molding material to the molding die.

(3) Examples FIGS. 1 and 2 show a box-shaped fiber-reinforced composite body 1, which is a synthetic resin matrix such as nylon and reinforcing fibers dispersed in the synthetic resin matrix.
For example, it is made of carbon fiber.

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

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

The molding apparatus 3 includes a molding material storage tank 7 having an open upper surface, and a suction box 8 which is arranged above the tank 7 and moves up and down, and a breathable molding die 9 is provided below the suction box 8. Be hung. The molding die 9 moves to the tank 7 as the suction box 8 moves up and down.
It is inserted into and removed from the inside through the opening 10. The space on the rear surface side of the molding die 9 and the inside of the suction box 8 are partitioned by a rectifying plate 12 having an infinite number of vent holes 11, and a connecting cylinder 13 projecting on the side surface of the suction box 8 has a suction fan 15 through a duct 14. Connected to.

The molding material 16 is charged into the tank 7 and the molding material 16
Is prepared by uniformly mixing chopped fiber type reinforcing fibers 17 and synthetic resin matrix powder 18 as clearly shown in FIG.

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

In the molding operation, as shown in FIG. 6 (a), the suction box 8 is lowered to dispose the molding die 9 in the tank 7, and the suction fan 15 is operated to suck the back surface of the molding die 9. give. In this case, the rectifying action of the rectifying plate 12 causes the entire back surface of the molding die 9 to be evenly sucked.

As a result, the molding material 16 in the tank 7, that is, the reinforcing fibers 17 and the powder 18 are integrally adsorbed on the surface of the molding die 9, and the adsorption operation keeps the powder 18 uniformly dispersed throughout. Material 2 is obtained.

Then, under the same suction action as described above, the suction box 8 is raised to dispose the molding die 9 outside the tank 7 as shown in FIG. 6 (b), and the material 2 is made of a synthetic resin binder b such as soluble nylon.
Is sprayed with a spray gun G to provide shape retention, and then the suction action is stopped to release the material 2.

After the mold release, the material 2 is subjected to a low temperature heat treatment to cure the synthetic resin binder b, and the material 2 is easily handled.

Next, the production of the fiber-reinforced composite body 1 will be described with reference to FIGS.

As shown in FIG. 7 (a), a box-shaped upper backing plate 19 having a flange portion 19a, a box-shaped lower backing plate 20 similarly having a flange portion 20a, and a frame sandwiched between both flange portions 19a, 20a. The spacers 21 are heated at 250 ° C. for 40 minutes.

As shown in FIG. 7 (b), three blanks 2 are sandwiched between the upper backing plate 19 and the lower backing plate 20, and a spacer 21 is sandwiched between both flanges 19a and 20a. Then, the laminate 22 is preheated at 250 ° C. for 40 minutes.

As shown in FIG. 7 (c), the laminated body 22 is sandwiched between a fixed upper mold 23 and a movable lower mold 24 which are heated to 185 to 190 ° C., and the lower mold 24 is applied with a load of 20 kg / cm ² . Cold pressing is performed by pressing the upper mold 23 with pressure. By this cold press,
The melt of the powder 18 is impregnated into the entire raw material 2 to bond the fibers to each other, whereby the fiber-reinforced composite body 1 is molded and simultaneously cooled. In this case, since the powder 18 is uniformly dispersed over the entire raw material 2, the impregnation is efficiently performed.

 As shown in FIG. 7D, the laminated body 22 is released.

As shown in FIG. 7 (e), the upper and lower backing plates 19, 20 and the spacer 21 are removed from the fiber reinforced composite body 1.

C. Effects of the Invention According to the present invention, it is possible to easily and stably form a material for a fiber-reinforced composite material in which a powder for a synthetic resin matrix is uniformly dispersed and held all over. Further, since only the suction work is performed, the manufacturing process can be simplified, mass productivity can be improved, and manufacturing cost can be reduced.

[Brief description of drawings]

1 and 2 show a fiber reinforced composite, and FIG. 1 is a perspective view,
Fig. 2 is a sectional view taken along the line II-II in Fig. 1, Fig. 3 is a perspective view of the material, Fig. 4 is a vertical side view of the molding apparatus, Fig. 5 is an enlarged explanatory view of the molding material, and Fig. 6 is the material. FIG. 7 is a drawing for explaining the molding process of FIG. 1 ... Fiber reinforced composite, 2 ... Material, 9 ... Mold, 16
...... Molding material, 17 …… Reinforcing fiber, 18 …… Synthetic resin matrix powder

Claims (1)

(57) [Claims] 1. A powder for a synthetic resin matrix and a reinforcing material for molding a material used for producing a fiber reinforced composite comprising a synthetic resin matrix and reinforcing fibers dispersed in the synthetic resin matrix. A fiber-reinforced composite, characterized in that a molding material is prepared by uniformly mixing with fibers, and then the back surface side of the breathable molding die is made to absorb the molding material to the surface of the molding die. Body material molding method.