JPS6025712A - Method for manufacturing fiber-reinforced plastic containers - Google Patents

Abstract

PURPOSE:To obtain the titled container with good working efficiency and good working precision, by rotating a mandrel to which a wooden mold and a bottom plate are attached in position, and winding, on the mandrel, continuous fibers that are impregnated with a resin with the fibers engaged with and turned at the wooden mold and bottom plate. CONSTITUTION:A wooden mold 5 for turning and engagement is attached to one end of a mandrel 4, and an FRP bottom plate 8 is engaged with the other end thereof, the bottom plate 8 having a corner section curved smoothly and continuously from the end surface thereof. A rotating shaft 7 of a turning gear 6 is attached to the rotational center of the wooden mold 5, and a turning support member 10 is pressed against the rotational center of the outer surface of the bottom plate 8. While a rotational force is applied to the rotating shaft 7, reinforcing continuous fibers 11 impregnated with a resin are wound around the mandrel 4, and are engaged with and turned at the wooden mold 5 and the bottom plate 8 so that the windings have a prescribed thickness. Thereafter, the resin with which the continuous fibers 11 are impregnated is hardened to obtain the intended FRP container.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to a method for manufacturing a fiber-reinforced plastic container, particularly to a method for integrally molding a bottom plate.

(Naka) Conventional technology Containers for chemicals and cryogenic containers for liquid nitrogen and liquid helium (
A container made of fiber reinforced plastic (hereinafter referred to as FRP) has conventionally been used as a cryostat. In particular, as a cryostat for liquid helium, it has a lower thermal conductivity than a metal one (it has the advantage of requiring only one person), and since it is an electrical insulator, it It has advantages such as no evaporation of liquid helium due to electric loss of 15 iF, and is lightweight.

As shown in Figures 1 and 2, the conventional manufacturing method for FRP containers involves fitting a bottom plate 2 into an inner cylinder 1 made of FRP, bonding the fitting part 3, and then bonding the flange. I was trying to install it by

(c) Problems to be solved by the invention According to the conventional manufacturing method as described above, the number of man-hours required for bonding the cylinder 1 and the bottom plate 2, and the need for folding in order to provide an appropriate fitting tolerance between the two. There was a problem.

In addition, if the processing precision of the fitting part 3 is not high enough, or if the adhesive performance deteriorates due to heat cycles between extremely low temperatures and room temperatures, the stored liquid such as liquid helium may leak, which may cause long-term reliability. There was also the issue of lack of sexuality.

This invention solves the above problems and improves processing efficiency.
The purpose of this invention is to provide a method for manufacturing FRP containers with good processing accuracy.

2) Means for Solving the Problems In order to solve the above problems, the present invention provides a method in which a wooden mold for winding and folding is attached to one end of the mandrel, and a corner part that is smoothly continuous from the end surface of the mandrel is provided at the other end. Apply the FRP bottom plate and attach the rotating shaft to the rotation center of the wooden mold,
A rotational support member is pressed against the rotational center of the bottom plate, and while applying a rotational force to the rotating shaft, the continuous fiber impregnated with resin is wound around a mandrel, and the continuous fibers are wrapped around the wooden pattern and the bottom plate at both ends and folded back. Wind it to the required thickness by
Thereafter, the resin impregnated into the continuous fibers is cured.

(E) Embodiment FIG. 3 shows an embodiment of the present invention. The mandrel 4 has one end closed and the other end open 17, and a wooden mold 5 for winding and folding can be placed at the closed end, and a rotating machine 6 rotates around the rotation center of the wooden mold 5 and the closed end. penetrates the shaft 7,
The shaft 7 is fixed integrally with the mandrel 4. In addition, the end face of the FRI' bottom plate 8, which has been formed into a predetermined shape in advance, is applied to the open end of the mandrel 4, and the rotational support member 10 is pressed to the rotation center of the outer face via a suitable seat plate 9. By driving the rotary machine 6 mentioned above, the wooden mold 5, the mandrel 4 and the bottom plate 8 can be rotated integrally.

As shown in FIG. 4, the reinforcing continuous fibers 11 wound around the mandrel 4 are obtained by impregnating glass fibers 13 fed from a supply source 12 with resin in a resin impregnation tank 14, and then uncured or semi-cured. In this state, winding is performed by swinging the mandrel 14 in the length direction at an appropriate winding angle using the carriage traverse 15.

When winding the continuous fiber 11, as shown in FIG.
Both ends of the mandrel 4 are hooked onto a wooden pattern 5 and a bottom plate 8 to make a turn.

In this case, when the bottom plate 8 bulges outward as shown in the figure (so-called mirror plate), it has a smooth curved surface 16 (see FIG. 3) continuous from the end surface of the mandrel 4, so it is continuous. This does not interfere with the winding of the fibers 11. When the bottom plate 8 is a flat plate, as shown in FIG. 6, the winding is performed by forming a smooth curved surface 16 at the corner portion.

After winding to a predetermined thickness in this manner, the impregnated resin is cured with or without heating. In this state, a wound layer of continuous fibers as shown by the two-dot chain line in FIGS. 3 and 6 is formed.

When the wound layer 17 is cut at appropriate positions before or after the resin impregnated into the continuous fibers is cured and taken out from the mandrel 4, the bottom plate 8 is integrated with the lower end of the cylinder 18, as shown in FIG. F Rl) containers can be obtained.

As shown in FIG. 8, the bottom plate 8 has a peripheral wall 19 that can fit on the outer periphery of the end of the mandrel 4, and the tip of the peripheral wall 19 is made gradually thinner so that the cylinder 18 is It may be formed so as to be continuous.

Further, the continuous fiber 11 can also be wound by so-called tape winding using prepreg.

(f) Effects As mentioned above, in this invention, when forming the cylindrical part of the container, the bottom plate is used as a hook for folding back the continuous fiber winding, and at the same time the winding Since the two are integrated, the integration is reliable, and the reliability against leakage at the boundary is greatly improved, and the processing efficiency is also improved.

[Brief explanation of drawings]

Figures 1 and 2 are cross-sectional views of a conventional FRP container, Figure 3 is a cross-sectional view of an apparatus implementing the present invention, Figure 4 is a schematic side view of the same continuous fiber supply section, and Figure 5 is a cross-sectional view of a conventional FRP container. is a plan view showing the same winding state as above, FIG. 6 is a partial sectional view of the device when the bottom plate is flat, and FIGS. It is. 4...Mandrel 5...Wood mold 7...Rotation 4i
[118... Bottom plate 10... Rotating support portion 11.
...Continuous fiber 16...Curved surface. Special jt I'll! Original person: Jiyu Electric Industry Co., Ltd. 1 Agent: Kama 1” Letter d

Claims (1)

[Claims] A wooden mold for winding and folding is attached to one end of the mandrel, and the other end is made of FRP with a corner part that smoothly continues from the end surface.
A rotating shaft is attached to the rotation center of the wooden mold, and a rotation support member is pressed to the rotation center of the bottom plate.
``While applying rotational force to the rotating shaft, the continuous fiber impregnated with resin is wound around the mandrel, and the continuous fiber impregnated with resin is wrapped around the wooden mold and bottom plate at both ends and folded back to the desired thickness, and then the above-mentioned A method for producing a fiber-reinforced plastic container, characterized by curing resin impregnated into continuous fibers.