JPH0424210B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a method for manufacturing a fiber-reinforced plastic end plate.

(b) Prior art An end plate fitted to the end face of a cylindrical body such as a pressure vessel,
That is, as shown in FIG. 1, the end plate is made by laminating a male die 1 for the end plate with a fabric 2 made of glass fiber, carbon fiber, etc. impregnated with a synthetic resin such as epoxy resin or polyester resin (see the dashed line in the figure). It is manufactured by applying pressure and heat to harden the impregnated resin.

In addition, as shown in Fig. 2, a male mold 3 and a female mold 4 for the head plate are
A fabric 5 made of the above-mentioned fibers is interposed in a vacuum casting mold consisting of a vacuum casting mold, and after the air inside the mold is exhausted from an exhaust port 6 to reduce the pressure, resin is injected from an injection port 7, and then There is also a method of producing mirror plates by applying pressure and heating.

(c) Problems to be solved by the invention The method shown in FIG. 1 cannot remove excess resin because there is no outer mold. Therefore, since the fiber content is low and voids are likely to be mixed into the lamination, there is a problem in that the void rate is high.

In addition, the method shown in FIG. 2 requires an extra female mold 4, which increases the mold cost.
This method requires steps such as laminating the fabric, evacuation, and injecting the resin, and the resin injection takes time, resulting in inefficient manufacturing.

An object of the present invention is to provide a method for manufacturing a fiber-reinforced plastic end plate that solves the above-mentioned problems.

(d) Means for solving the problems In order to solve the above problems, this invention
The outer mold is made of an elastic sheet, the elastic sheet is pressed against the laminate on the curved surface of the male mold, and its peripheral part is attached to the base, and then tension is applied to the elastic sheet to form the elastic sheet into the male mold. The laminate is pressed by following the shape.

(E) Embodiment In the first embodiment of the present invention, pressurization is performed by vacuum evacuation. That is, as shown in Figure 3,
A male die 10 for an end plate is provided on a base 11, a groove 12 is formed along the outer periphery of the male die 10 on the base 11, and an exhaust port 13 is provided closer to the male die 10 than the groove 12. The male mold 10 consists of a cylindrical portion 14 and a convex curved surface portion 15 smoothly continuous therewith.
For this male mold 10, a ready-made metal end plate may be used as is.

As shown in FIG. 4, a laminate 16 of a predetermined thickness is formed by overlaying resin-impregnated fabric on the male mold 10 described above.
is formed, and an outer mold 17 made of an elastic sheet such as a rubber sheet is placed thereon. The outer mold 17 has a reinforcing ring 18 formed around its periphery.
A required tension is applied to fit it into the groove 12, and then it is evacuated through the exhaust port 13.
The outer mold 17 presses the laminate 16 on the curved part 15, and also presses the laminate 16 on the outer periphery of the cylindrical part 14 by evacuation (see chain line in Figure 5), and evenly coats the inside with the resin impregnated into the fabric. Allocate to.

The laminate 16 is cured by maintaining the above-described pressurized state for a predetermined period of time, but the curing can also be accelerated by heating from inside the male mold 10.

Next, in the second embodiment shown in FIG. 6, after the outer mold 17 is placed on the laminate 16 on the cylindrical part 14 and pressed, the cylindrical mold 19 is fitted around the cylindrical part 14 of the male mold 10. As a result, the outer mold 17 on the curved surface portion 15 is further tightened, and the laminate 16 on the outer periphery of the cylindrical portion 14 is pressed by the cylindrical mold 19 itself. In this case, air and voids within the laminate 16 are exhausted from the exhaust port 13.

To cure the laminate 16 from the above state,
This is the same as in the previous case.

Note that if a curved surface 20 that slightly engages the curved surface portion 15 is formed on the inner peripheral surface of the cylindrical mold 19, the outer mold 17 can be easily tensioned.

(f) Effects As described above, in the manufacturing method of the present invention, the outer mold is constituted by an elastic sheet, the elastic sheet first presses the laminate on the curved part of the male mold, and then presses the laminate around the cylindrical part. Since the laminate is pressed, voids contained in the laminate are easily discharged, and
This has the effect of evenly distributing the resin, improving product reliability.

Furthermore, since the outer mold is made of an elastic sheet, there is an effect that the manufacturing cost of the mold can be reduced.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a part of a conventional production example, Fig. 2 is a sectional view of another conventional production example, Fig. 3 is a sectional view of the male mold of the first embodiment, Fig. 4 , FIG. 5 is a sectional view of the manufacturing process of the first embodiment, and FIG. 6 is a sectional view of the manufacturing process of the second embodiment. 10...Male type, 11...Base, 12...Groove, 1
3... Exhaust port, 14... Cylindrical part, 15... Curved surface part, 16... Laminate, 17... Outer mold, 18... Reinforcement ring, 19... Cylindrical shape.

Claims (1)

[Scope of Claims] 1. A male die for an end plate consisting of a cylindrical portion and a curved surface portion smoothly connected to the upper portion thereof is provided on a base with the cylindrical portion facing down, and a woven fabric impregnated with resin is placed on the male die. A method for manufacturing a fiber-reinforced plastic end plate in which layers are laminated, an outer mold is placed on the laminate, and pressure is applied, in which the outer mold is made of an elastic sheet, and the elastic sheet is pressed against the laminate on the curved surface part. The end plate made of fiber-reinforced plastic is characterized in that the laminate is pressed by attaching its peripheral portion to a base in the state of the laminate, and then applying tension to the elastic sheet to make the elastic sheet conform to the male shape. Production method. 2. The fiber reinforcement according to claim 1, characterized in that when applying tension to the elastic sheet to press the laminate, a portion of the laminate surrounded by the elastic sheet and the male mold is evacuated. A method of manufacturing a plastic mirror plate. 3. When pressing the laminate by applying tension to the elastic sheet, a cylindrical mold is fitted on the outside of the elastic sheet that presses the laminate on the outer periphery of the male cylinder part. The method for manufacturing the fiber-reinforced plastic mirror plate described above.