JPS6143542A - Manufacture of frp parts - Google Patents

Abstract

PURPOSE:To enable also to fill a rib sufficiently with long fiber, by a method wherein the rib is premolded on a part of a prepreg sheet and then hot press molding is performed along with the remainder of the prepreg sheet. CONSTITUTION:A part of a prepreg sheet 11A is mounted on a molding bottom force 10, to begin with. Then the prepreg sheet 11A is pressed into a rib- molding groove part 10a for filling by pressing the prepreg sheet 11A. Then the remaining prepreg sheet 11B is mounted on a premolded article 16' and hot pressing of the same is performed along with the premolded article by making a top force 18 operated. With this hot-press molding process, it bcomes that long fiber 13 is filled up sufficiently into a rib 17 by keeping continuity of the long fiber 13 holding, by a method wherein gelatinized resin 14 of both the prepreg sheets 11A, 11B is filled up into a cave part 15 and both the prepreg sheets 11A, 11B are compounded and unified by the gelatinized resin 14.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention particularly relates to a method for manufacturing ribbed FRP parts.

[Prior art] Conventionally, by laminating and hot press forming multiple prepreg sheets made by blending long fibers (continuous fibers),
Methods for manufacturing FRP parts have been put into practical use.

By the way, as an automobile part aiming at weight reduction, the 7th
As shown in the figure, when the engine mount member l is manufactured from FRP, high strength and high rigidity are required.
Many ribs 2. ..., 2 needs to be formed and reinforced.

However, as shown in detail in FIG. 8, the ribs 2 are protrusions that stand up at an acute angle in a direction perpendicular to the orientation direction of the long fibers 3. Therefore, during hot press molding, the long fibers 3.・・・
・, 3 is difficult to enter into the rib 2, and only the gelled resin 4 is filled (resin rich), so the rib 2
There was a problem in that high strength and high rigidity could not be obtained due to the occurrence of cracks.

As a method of manufacturing an FRP molded product, a method has been proposed in which the bottom part 6 and handrail part 7 of a preformed bathtub 5 are compositely integrated with a prepreg sheet 8, as shown in FIG. (Refer to Publication No. 58-24413), it is conceivable to apply this technology to compositely integrate the fiber-filled ribs 2 into the engine mount member 1. Since there is no continuity between the fibers of No. 2, there is still a problem that high strength and high rigidity cannot be obtained.

[Object of the invention] The present invention has been made in view of the above-mentioned conventional problems, and
FR that makes it possible to sufficiently fill the ribs with long fibers
The purpose of this invention is to provide a method for manufacturing P parts.

[Structure of the Invention] Therefore, the present invention is a method for manufacturing an FRP part with ribs by laminating and hot press molding a plurality of prepreg sheets made by blending long fibers. A part of the prepreg sheets out of the plurality of prepreg sheets to be processed is placed on the lower mold, and then this part of the prepreg sheets is placed in the rib-forming part 171' formed in the lower mold and placed in the preforming mold. The structure is such that the prepreg sheet is press-fitted using a tool, and then the remaining prepreg sheet is laminated on top of the preform and hot press molded together with the preform.

[Effects of the Invention] According to the present invention, ribs are preformed on some of the flexible prepreg sheets, and then the remaining prepreg sheets are heat press-molded, so that the length of some of the prepreg sheets can be reduced. Since the fibers are sufficiently filled into the ribs while maintaining continuity, the ribs are prevented from becoming rich in resin, and high strength and high rigidity can be ensured in the FRP parts.

[Example] As shown in FIG. 1, a rib molding groove 10a is formed in the lower molding mold 10, and a plurality of prepreg sheets IIA to be laminated and molded on the lower molding mold 10, II
First, some prepreg sheets IIA of B are placed. This part of the prepreg sheet IIA is thin and has flexibility.

Next, as shown in FIG. 2, the prepreg sheet +1A is pressurized by a preforming mold tool I2 that hits the protrusion 12a that fits into the rib molding groove 10a of the lower mold lO,
The prepreg sheet IIA is press-fitted into the rib forming groove 10a.

Through this preforming process, the long fibers 13 of the prepreg sheet 11A maintain their continuity while forming the iM part 0a for molding.
A fully filled preform 16° is now formed.

Thereafter, as shown in FIG. 3, the remaining prepreg sheet LLB is laminated on top of this preform 16'.
The upper mold I8 is operated to perform hot press molding together with the preformed product.

Through this dry press molding process, as shown in Fig. 4, the gelled resin 1 of both prepreg sheets IIA and IIB is
4 is filled into the hollow portion 15, both prepreg sheets lIA, lll3! are formed by the gelled resin +4. l
<The FRP part with ribs 17 (ennon mount menori 16) is completed by being integrated.

During this hot press molding process, the long fibers 13 filled in the rib forming grooves +Oa of the prepreg sheet 11A are slightly restored, but as a completed FRP part 16, the long fibers 13 remain continuous and remain intact. 17 will be fully filled.

Figure 5 shows the strength and rigidity test of the engine mount member (conventional product) 1 on which resin-rich ribs are formed and the engine mount member 16 manufactured by this method (honankai). .

Each member 1.16 contains long fibers 45% by weight, knowledge M115
It was composed of a prepreg sheet containing 40% by weight of resin (unsaturated polyester).

Then, each member 1.16 was supported at both ends and a load F was applied. The results are shown in the graph of FIG.

As is clear from the graph, the conventional product 1 has a load of 500~
The yield point was reached at 550 kg, whereas the yield point was reached at 700 to 750 kg for Honkai Kai 16.

Therefore, it can be seen that the strength and rigidity of the present guide 16 are improved by about 40% compared to the conventional product 1.

[Brief explanation of drawings]

1 to 4 are cross-sectional views showing the manufacturing process of FRP parts according to the present invention, FIG. 5 is a side view showing strength and rigidity tests, and FIG. 6 is a graph showing the test data of FIG. Figure 7 is FR
FIG. 8 is a perspective view of a P part (engine mount member), FIG. 8 is a cross-sectional view of a conventional rib portion, and FIG. 9 is a perspective view showing a conventional method of manufacturing an FRP molded product. lO... Lower mold for molding, loa... Groove for rib forming, +1A, IIB... Buri Pregunto, 12...
Preforming tool, 13... long fiber, 14...
Resin, 16-・FRP parts (engine mount menori, 17-・rib.

Claims (1)

[Claims] (1) A method of manufacturing a ribbed FRP part by laminating and hot press molding a plurality of prepreg sheets made by blending long fibers, first, a part of the plurality of sheets to be laminated of the prepreg sheet is placed on the lower mold, then a part of the prepreg sheet is press-fitted into the rib forming groove formed in the lower mold using a preforming tool, and then the remaining part is A method for manufacturing an FRP part, characterized in that a prepreg sheet is laminated and mounted on the preform, and the preform is hot press molded together with the preform.