JPS6367675B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an X-ray transparent pressure vessel.

In an X-ray transmission pressure vessel that stores high-pressure gas and detects X-rays, it is necessary to increase the wall thickness of the vessel to increase the pressure.
There is a problem in that the transmission of X-rays to be detected becomes poor. Therefore, aluminum, which is a metal with relatively good X-ray transmittance, has conventionally been used for X-ray transmitting pressure vessels. As for the X-ray transmitting part of the container, the thickness of the aluminum is set to a limit design that allows it to withstand the internal pressure used, but even if the thickness is reduced to the limit, satisfactory X-ray transmission cannot be achieved. The current situation is that it cannot be done.

Although carbon cloth laminates are relatively expensive, they have superior strength and electromagnetic wave transmittance compared to aluminum. Therefore, it is conceivable to attach this carbon cloth laminate to the X-ray transparent part of a conventional pressure vessel using mechanical methods or adhesives. There is a problem that gas leakage occurs during use due to the difference in linear expansion coefficient.

The purpose of the present invention is to obtain a pressure vessel with higher strength and higher X-ray transmittance than an aluminum pressure vessel.
The object of the present invention is to provide a method for manufacturing an X-ray transmitting pressure vessel that can be attached to the transmitting part of the X-ray transmitting pressure vessel regardless of the shape of the container and without causing gas leaks during use. .

Therefore, in the present invention, a carbon cloth or a carbon cloth laminate having a larger area than the X-ray transparent part is installed in the X-ray transparent part of the space part of a mold for manufacturing a pressure vessel through which X-rays are transmitted from at least one direction. Place other reinforcing fibers in the space other than the X-ray transparent part, and then use a thermosetting resin to integrate the carbon cloth or carbon cloth laminate and the reinforcing fibers. This is a method for manufacturing an X-ray transmitting pressure vessel characterized by impregnation and curing.

As shown in the schematic cross-sectional view of FIG. 1, the X-ray transmission pressure vessel has an internal volume of about 250 cm ³ and contains gas at an internal pressure of about 10 Kg/cm ² . X-rays enter from the direction of the arrow and pass through the transparent portion 1 of the container in the area indicated by the double arrow 5.

A mold for manufacturing containers consists of an outer mold that forms the outer shape of the container and a middle mold that forms the inner shape of the container. When the outer mold and the middle mold are assembled, there is a portion of the container between them. A space corresponding to the thickness, a so-called cavity, is created. The mold may require a sliding mold section if the x-ray transparent part of the container is particularly thin-walled and undercuts occur during demolding. In that case, the sliding type is useful for forming the X-ray transmitting part in a direction perpendicular to the direction of X-ray incidence and having a constant thickness, and for holding the carbon cloth or carbon cloth laminate in a desired state. Further, even when no undercut occurs during demolding, the mold is preferably provided with a sliding mold part in order to hold the carbon cloth or carbon cloth laminate in a desired state.

Carbon cloth 2 is placed in the X-ray transparent part 1 of the space.
A predetermined number of sheets, for example 6 to form a wall thickness of 2 mm, are placed between the medium mold and the sliding mold. For the purpose of making the X-ray transparent part 1 thin and highly transparent, reinforcing fibers and reinforcing powders other than carbon should not be used in combination, but some X-ray transmission may be sacrificed for other benefits. It is possible to use them mixedly.

The part 3 of the space other than the X-ray transparent part is filled with other inexpensive reinforcing fibers 4 such as glass chops or carbon cloth so as to withstand the internal pressure of the container. Of course, since the carbon cloth 2, which has a larger area than the area of the X-ray transmitting part 1, is arranged in the X-ray transmitting part 1, the peripheral part of the carbon cloth 2 is arranged in the part 3 other than the X-ray transmitting part, as shown in the figure. . In addition, as shown in Fig. 2, if the carbon cloth 2 is wrapped around the middle size and the carbon cloth is placed in the transparent part 1, the carbon cloth 2 and other reinforcing fibers 4 will be used in the part 3 other than the transparent part. It will be strengthened.
In either case, since the carbon cloth having a larger area than the transmitting part is used, the peripheral part of the transmitting part 1 is reinforced by the carbon cloth and reinforcing fibers.

Next, a resin made by uniformly mixing an epoxy resin and a hardening agent is injected into the mold and impregnated and hardened. X-ray transparent part 1 with carbon cloth placed and part 3 other than the X-ray transparent part with glass tip placed
and are cured together with the same resin. Therefore, unlike in the case of mechanical methods or adhesion, there are no boundary surfaces around the X-ray transparent part and no gas leak occurs.

The X-ray transparent pressure vessel manufactured by the method described above has a wall thickness of approximately 2 mm in the X-ray transparent part, whereas in the case of a conventional aluminum container that can withstand an internal pressure of 10 kg/cm ² , the wall thickness of the X-ray transparent part was 4 to 5 mm. I was able to make it as thin as possible. The X-ray transmittance of a 2 mm resin layer of carbon cloth is equivalent to that of 0.30 mm of aluminum, and the amount of X-ray transmittance of the manufactured pressure vessel is higher than that of a conventional aluminum container with a wall thickness of 4 to 5 mm. 14
It was possible to increase the amount by ~17 times.

In the X-ray transmitting section 1, instead of using carbon cloth, a carbon cloth laminate 6 with a larger area than the transmitting section is used.
It is also possible to arrange the fibers as shown in FIG. 3, and to arrange other reinforcing fibers 4 in the part 3 other than the transparent part, and to integrally impregnate and harden them using a resin. In this case, since the resin used can be made so that it does not reach the X-ray transparent part, a resin containing a base material can be used as the impregnating resin. By selecting the base material, there are advantages that the strength can be increased and that it can also be used as an X-ray shielding material. The resin used for impregnation is rarely the same resin, especially the same resin, as the resin used for the carbon cloth laminate, so that no boundaries occur.

The way the carbon cloth is inserted and its thickness can be changed depending on the purpose, and the reinforcing fibers placed in areas other than the transparent part can be in any form such as glass fibers, synthetic fibers, natural fibers, thread cloth, etc. . In addition to epoxy resins, the thermosetting synthetic resin may be selected from polyester resins, phenol resins, polyurethane resins, etc. for use in casting for impregnation.

Example: Medium mold 11 having a cross-sectional shape as shown in Fig. 4
Wrap carbon cloth 2 around it to a thickness of 6 to 7 mm. The outer mold 12 is set on this with bolts, and the space 14 of the mold is filled with the glass chop 4 with the bottom facing up (FIG. 5). Finally, bottom mold 1
3 with the bolt. The carbon cloth 2 used was CFP3113 (0.27t) manufactured by Arisawa Manufacturing Co., Ltd., and the glass tip 4 was RX- manufactured by Nippon Sheet Glass Co., Ltd.
It is CSX030-0034. This was impregnated with epoxy resin by vacuum impregnation method. The resins used were R-140 manufactured by Mitsui Oil Epoxy Co., Ltd. and HN- manufactured by Hitachi Chemical Co., Ltd.
It is 2200. Curing was carried out under a pressure of 20 kg/cm ² .

After curing, the glass tip layer of the X-ray transparent section 1 was machined to a thickness of 5 mm, so that the carbon cloth layer finally appeared.
Figure 6 shows the cross-sectional shape of the finished product. The container made in this way is strong without peeling or cracking because the boundary between the carbon cloth layer and the glass tip layer is integrated. In this case, it exhibited sufficient strength even in a water pressure test of 20 kg/cm ² .

According to the method of the present invention, the X-ray transparent part is made of a carbon cloth laminate, which has the features of high strength and high X-ray transmission, and the periphery of the X-ray transparent part is overlapped by carbon cloth and other reinforcing fibers. It is strengthened by resin and is impregnated and cured with resin, so it can be used regardless of the shape of the container and without causing gas leaks.
X with a carbon cloth laminate incorporated into the X-ray transparent part
A radiolucent pressure vessel can be obtained.

[Brief explanation of drawings]

1 and 2 are schematic cross-sectional views of an X-ray transparent pressure vessel manufactured according to the present invention using carbon cloth in the X-ray transparent section, and FIG. 3 shows a carbon cloth laminate in the X-ray transparent section. A similar diagram using . FIG. 4 shows the cross-sectional shape of the mold used in the example, FIG. 5 shows how the carbon cloth and glass tip of the example are arranged, and FIG. 6 is a schematic diagram showing the completed container of the example. 1...X-ray transparent part, 2...carbon cloth, 3...X
Portions other than the radiation transmitting portion, 4... Reinforcing fiber, 5... X-ray transmitting range, 6... Carbon cloth laminate, 11... Medium size, 12... Outer mold, 13... Bottom mold, 14... Space portion.

Claims (1)

[Claims] 1. A method for manufacturing a pressure vessel through which X-rays are transmitted from at least one direction, in which the area corresponding to the X-ray transparent part of the container in the space of the mold for manufacturing the container is larger than the area of the X-ray transparent part. A wide carbon cloth or a carbon cloth laminate is placed, other reinforcing fibers are placed in the space other than the part corresponding to the container X-ray transmitting part, and then a thermosetting resin is used to make the carbon cloth Alternatively, a method for producing an X-ray transmission pressure vessel, which comprises integrally impregnating and curing a carbon cloth laminate and the reinforcing fibers.