JP6969403B2 - Manufacturing method of high pressure gas tank - Google Patents

Description

The present disclosure relates to a method for manufacturing a high pressure gas tank.

Inventions relating to a method for manufacturing a high-pressure gas tank have been conventionally known (see Patent Document 1 below). Patent Document 1 describes a method for manufacturing a high-pressure gas tank having a fiber layer formed by repeatedly winding a fiber bundle around the outer surface of a liner by mounting a base on the tops of dome portions at both ends in the axial direction of the liner. The method for manufacturing a high-pressure gas tank described in Patent Document 1 includes the following steps (see the same document, claim 1 and the like).

First, a liner is prepared in which the dome portion has an outer surface that imitates a uniform tension curved surface, and a bottomed depressed pedestal portion for mounting a base is provided at the top of the dome portion. Next, a mouthpiece having a mouthpiece flange that enters the recessed pedestal portion and a mouthpiece main body that protrudes from the mouthpiece flange toward the liner end is mounted on the top so that the mouthpiece flange enters the recessed pedestal portion.

Next, a ring-shaped cap is attached to the boundary portion between the outer peripheral edge of the flange of the base flange that has entered the depressed pedestal portion and the inner peripheral wall of the depressed pedestal portion, and the boundary gap of the boundary portion is covered with the cap. Next, the fiber bundle impregnated with the thermosetting resin is repeatedly wound around the outer surface of the liner to which the base and the cap are attached to form a fiber layer.

In this conventional method for manufacturing a high-pressure gas tank, in the step of covering the boundary gap with a cap, the ring-shaped cap has a linear expansion coefficient equivalent to that of the liner, and the curved surface of the outer surface of the dome portion and the outer surface of the base flange. Use a cap with an inner surface that follows the shape. Further, in the step of forming the fiber layer, the helical winding layer around which the dome portion is wound including the base flange is first formed by the fiber bundle so that the fiber bundle is hung over the dome portions at both ends in the axial direction. ..

According to this conventional method for manufacturing a high-pressure gas tank, the entry of the thermosetting resin from the fiber bundle impregnated with the thermosetting resin to the boundary portion can be easily suppressed by the cap. Further, when the thermosetting resin is heat-cured in the fiber layer formed from the fiber bundle impregnated with the thermosetting resin, the cap can be prevented from being damaged due to the difference in thermal expansion, and the heat is cured from the damaged part to the boundary portion. It is also possible to suppress the entry of sex resin.

Japanese Unexamined Patent Publication No. 2017-194150

In the step of forming the fiber layer, the internal pressure of the liner is increased after the formation of the earliest helical winding layer, and under the increased pressure of the internal pressure, the fiber layer following the earliest helical winding layer is transferred to the outer surface of the liner. It is described in the above-mentioned Patent Document 1 that the fiber bundle is formed by repeatedly winding the fiber bundle (see the same document, claim 3 and the like).

More specifically, following the formation of the innermost helical winding layer, low-angle helical winding is continued under the condition where the internal pressure of the liner is increased, and then hoop winding is performed under the condition of further increasing the internal pressure. This is described in Patent Document 1 (see the same document, paragraph 0036, etc.).

However, in the step of forming the fiber layer, it may be necessary to rewind the fiber bundle impregnated with the thermosetting resin when an abnormality occurs. In this case, if the relationship between the internal pressure of the liner and the number of turns of the fiber bundle is broken under the condition that the internal pressure of the liner is increased, the burst strength of the high-pressure gas tank may decrease.

The present disclosure has been made in view of the above problems, and provides a method for manufacturing a high-pressure gas tank capable of improving the burst strength of the high-pressure gas tank as compared with the conventional case.

The method for manufacturing a high-pressure gas tank according to the present disclosure is a method for manufacturing a high-pressure gas tank including a plurality of fiber layers, which comprises winding a fiber bundle impregnated with a resin around a liner to form the fiber layer, and the liner. A step of peeling the fiber bundle from the liner when an abnormality occurs in the wound fiber bundle is provided, and a step of forming the fiber layer and a step of peeling the fiber bundle are wound around the liner. A step of measuring the amount of the fiber bundle, a step of obtaining the number of layers of the fiber layer based on the amount of the fiber bundle, and a step of setting the internal pressure of the liner according to the number of layers of the fiber layer. And is characterized by including.

In the method for manufacturing a high-pressure gas tank of this embodiment, the step of forming the fiber layer includes a step of determining the number of layers of the fiber layer based on the amount of the fiber bundle, so that an abnormality occurs in the fiber bundle wound around the liner. Occasionally, it is possible to identify the fiber layer containing the fiber bundle in which the abnormality has occurred. Further, the step of forming the fiber layer includes a step of setting the internal pressure of the liner according to the obtained number of layers of the fiber layer, so that the internal pressure of the liner is increased as the number of layers of the fiber layer increases, for example. Can be made to. Thereby, in the outer fiber layer, the fiber bundle can be wound around the liner with a higher tension, the loosening of the fiber bundle can be prevented, and the burst strength of the high-pressure gas tank can be improved.

Further, as described above, the step of peeling the fiber bundle from the liner when an abnormality occurs is the step of measuring the amount of the fiber bundle and the step of forming the fiber layer in the same manner as the step of forming the fiber layer. It includes a step of determining the number and a step of setting the internal pressure of the liner. Thereby, for example, when the fiber layer including the fiber bundle in which the abnormality has occurred is peeled off from the liner, the internal pressure of the liner can be reduced according to the decrease in the number of layers of the fiber layer. As a result, shrinkage of the liner due to an extreme decrease in the internal pressure of the liner is prevented, and the balance between the internal pressure of the liner and the tension of the fiber bundle can be maintained. Therefore, the generation of a gap between the liner and the fiber bundle can be prevented, the looseness of the fiber bundle can be prevented, and the burst strength of the high-pressure gas tank can be improved.

According to the method for manufacturing a high-pressure gas tank according to the present disclosure, the burst strength of the high-pressure gas tank can be improved as compared with the conventional case.

Sectional drawing which shows an example of a high pressure gas tank. The flow chart of the manufacturing method of the high pressure gas tank which concerns on one Embodiment of this disclosure. The graph which shows the change by the processing time of the amount and tension of a fiber bundle and the internal pressure of a liner. The graph which shows the decrease of the burst strength of the conventional high pressure gas tank.

Hereinafter, an embodiment of the method for manufacturing a high-pressure gas tank according to the present disclosure will be described with reference to the drawings.

Figure 1 is a sectional view showing an example of a high-pressure gas tank 1 thus is manufactured in a manufacturing method of a high-pressure gas tank of the present embodiment. The high-pressure gas tank 1 includes, for example, a liner 2 which is a resin container, a fiber reinforced resin layer 3 formed on the outer surface of the liner 2, and caps 5 and 6 provided at both ends in a direction along the central axis 4. It is equipped with. The fiber reinforced resin layer 3 has a structure in which a plurality of fiber layers are laminated.

FIG. 2 is a flow chart of the high-pressure gas tank manufacturing method S100 of the present embodiment. The method S100 for manufacturing a high-pressure gas tank according to the present embodiment is, for example, a method for manufacturing a high-pressure gas tank 1 including a fiber-reinforced resin layer 3 composed of a plurality of fiber layers. In the high-pressure gas tank manufacturing method S100 of the present embodiment, the fiber layer forming step S110 in which the fiber bundle impregnated with the resin is wound around the liner 2 to form the fiber layer, and when an abnormality occurs in the fiber bundle wound around the liner 2. The fiber bundle peeling step S120 for peeling the fiber bundle from the liner 2 is provided.

Although the details will be described later, in the high-pressure gas tank manufacturing method S100 of the present embodiment, the fiber layer forming step S110 and the fiber bundle peeling step S120 are the measurement steps S114 and S122, the layer number calculation steps S116 and S123, and the internal pressure setting. It is characterized by including steps S111 and S124. The measuring steps S114 and S122 are steps for measuring the amount of fiber bundles wound around the liner 2. The layer number calculation steps S116 and S123 are steps for obtaining the number of layers of the fiber layer based on the amount of the fiber bundle wound around the liner 2. The internal pressure setting steps S111 and S124 are steps for setting the internal pressure of the liner 2 according to the number of layers of the fiber layer on the outer surface of the liner 2.

Hereinafter, the method S100 for manufacturing a high-pressure gas tank according to the present embodiment will be described in more detail. As described above, the method S100 for manufacturing a high-pressure gas tank of the present embodiment includes a fiber layer forming step S110 in which a fiber bundle impregnated with a resin is wound around a liner 2 to form a fiber layer. In the example shown in FIG. 2, the fiber layer forming step S110 includes a tension setting step S112 and a winding step S113 in addition to the above-mentioned measurement step S114, layer number calculation step S116, and internal pressure setting step S111.

Further, as described above, the high-pressure gas tank manufacturing method S100 of the present embodiment includes a fiber bundle peeling step S120 for peeling the fiber bundle from the liner 2 when an abnormality occurs in the fiber bundle wound around the liner 2. .. In the example shown in FIG. 2, the fiber bundle peeling step S120 includes a winding peeling step S121 in addition to the measurement step S122, the layer number calculation step S123, and the internal pressure setting step S124 described above.

FIG. 3 shows the amount of the fiber bundle wound around the liner 2, the tension of the fiber bundle wound around the liner 2, and the internal pressure of the liner 2 as the processing time elapses in the high-pressure gas tank manufacturing method S100 of the present embodiment. It is a graph which shows an example of how it changes. Before the start of the high-pressure gas tank manufacturing method S100 of the present embodiment, the amount of fiber bundles (fiber usage amount) wound around the liner 2 shown by the thick solid line is zero.

When the method S100 for manufacturing a high-pressure gas tank of the present embodiment is started, first, the fiber layer forming step S110 is started. In the fiber layer forming step S110, first, the internal pressure setting step S111 is started. The internal pressure setting step S111 is a step of setting the internal pressure of the liner 2 according to the number of layers of the fiber layer on the outer surface of the liner 2, as described above.

In the internal pressure setting step S111, for example, the liner 2 provided with the bases 5 and 6 by the rotating shaft is supported. Then, for example, the internal pressure of the liner 2 is measured by using a pressure gauge having a pressure gauge for measuring the internal pressure of the liner 2, an air supply system for pumping air to the liner 2, a control unit for controlling the air supply system, and the like. , Control to the set pressure.

In the internal pressure setting step S111, for example, when the number of layers of the fiber layer on the outer surface of the liner 2 does not reach the specified number of layers, the internal pressure of the liner 2 is set to about 0.1 [MPa]. After the internal pressure setting step S111, the tension setting step S112 is started.

The tension setting step S112 is a step of setting the tension applied to the fiber bundle to be wound around the liner 2, for example, according to the number of layers of the fiber layer on the outer surface of the liner 2 and the internal pressure of the liner 2. In the example shown in FIG. 3, the tension applied to the fiber bundle for forming the first layer fiber layer is set to a value from 50 [N] to 250 [N], for example. After the tension setting step S112, the winding step S113 is started.

In the winding step S113, a fiber layer is formed on the outer side of the liner 2 by, for example, filament winding (FW). Specifically, the tension set in the tension setting step S112 is applied to the fiber bundle impregnated with the resin, and the fiber bundle is wound around the liner 2 while rotating the liner 2 supported by the rotation shaft to form the liner 2. A fiber layer is formed on the outside.

In the winding step S113, for example, an air cylinder for applying tension to the fiber bundle to be wound around the liner 2, a force sensor for measuring the tension of the fiber bundle, a tension applying mechanism including a control unit for controlling the air cylinder, and the like are used. , The tension applied to the fiber bundle wound around the liner 2 is controlled. In the example shown in FIG. 3, the tension applied to the fiber bundle for forming the first layer fiber layer is controlled in the range of, for example, 200 [N] or more and 250 [N] or less.

Further, the measurement step S114 is started in parallel with the winding step S113. As described above, the measurement step S114 is a step of measuring the amount of the fiber bundle wound around the liner 2. Specifically, for example, the amount of fiber bundles wound around the liner 2 is calculated based on the value of the encoder that measures the rotation angle of the liner 2. In the example shown in FIG. 3, by winding the fiber bundle around the liner 2 by the winding step S113, the amount of the fiber bundle (the amount of fiber used shown by the thick solid line in FIG. 3) increases in proportion to the processing time.

In the high-pressure gas tank manufacturing method S100 shown in FIG. 2, while the winding step S113 and the measurement step S114 are being performed, an abnormality determination S115 for determining the presence or absence of an abnormality such as the presence or absence of a stop due to an equipment abnormality is performed. If there is no abnormality in the abnormality determination S115, the layer number calculation step S116 is started in parallel with the winding step S113 and the measurement step S114.

The layer number calculation step S116 is a step of obtaining the number of layers of the fiber layer based on the amount of the fiber bundle wound around the liner 2. That is, the amount of fiber bundles used in each of the plurality of fiber layers constituting the fiber reinforced resin layer 3 of the high-pressure gas tank 1 is predetermined. Therefore, in the layer number calculation step S116, the number of layers of the fiber layer formed on the outside of the liner 2 can be calculated based on the amount of the fiber bundle wound around the liner 2.

In the high-pressure gas tank manufacturing method S100 shown in FIG. 2, for example, the layer number increase determination S117 for determining the increase in the number of fiber layers calculated by the layer number calculation step S116 is performed. If the number of layers has not increased as a result of the layer number increase determination S117, the winding step S113, the measurement process S114, the abnormality determination S115, and the layer number calculation step S116 are repeated. As a result, as shown in FIG. 3, the amount of fiber bundles (fiber usage amount) increases in proportion to the processing time.

Further, in the high-pressure gas tank manufacturing method S100 shown in FIG. 2, for example, if an increase in the number of layers is determined in the determination for increasing the number of layers S117, it is specified whether or not the number of layers of the fiber layer has reached the specified number of layers. The number of layers determination S118 is performed. As a result of the predetermined number of layers determination S118, if the number of layers of the fiber layer formed on the outside of the liner 2 reaches the specified number of layers, the fiber layer forming step S110 is terminated.

As a result of the predetermined number of layers determination S118, if the number of layers of the fiber layer formed on the outside of the liner 2 does not reach the specified number of layers, the internal pressure setting step S111 is performed again to form the fiber layer on the outside of the liner 2. The internal pressure of the liner 2 is set according to the number of layers of the fiber layer. In the example shown in FIG. 3, in the internal pressure setting step S111 after the first fiber layer is formed, the internal pressure setting value of the liner 2 is maintained at about 0.1 [MPa].

After that, the tension setting step S112 is performed again to set the tension applied to the fiber bundle wound around the liner 2 according to the number of layers of the fiber layer on the outer surface of the liner 2 and the internal pressure of the liner 2. In the example shown in FIG. 3, in the tension setting step S112 after the first fiber layer is formed, the tension applied to the fiber bundle for forming the second fiber layer is, for example, 200 [N]. As mentioned above, it is maintained in the range of 250 [N] or less.

After that, the winding step S113, the measurement step S114, the abnormality determination S115, the layer number calculation step S116, the layer number increase determination S117, and the specified number of layers determination S118 are performed again to form the second fiber layer. In the fiber layer forming step S110, by repeating each of the above steps, for example, the fibers are laminated on the first and second fiber layers, and the third layer, the fourth layer, ..., the Nth layer, the N + 1th layer, A plurality of fiber layers are sequentially formed, such as N + 2nd layer.

That is, in the fiber layer forming step S110, as shown by the arrow A1 in FIG. 3, the internal pressure of the liner 2 is set to the specified internal pressure corresponding to the fiber layer of the Nth layer. Next, as shown by the arrow A2 in FIG. 3, the tension applied to the fiber bundle wound around the liner 2 is set to a predetermined tension corresponding to the fiber layer of the Nth layer. Next, as shown by the arrow A3 in FIG. 3, the fiber layer of the Nth layer is formed by filament winding.

Further, as shown by the arrow A4 in FIG. 3, the internal pressure of the liner 2 is set to the specified internal pressure corresponding to the fiber layer of the N + 1th layer. Next, as shown by the arrow A5 in FIG. 3, the tension applied to the fiber bundle wound around the liner 2 is set to a predetermined tension corresponding to the fiber layer of the N + 1th layer. Next, as shown by the arrow A6 in FIG. 3, the fiber layer of the N + 1th layer is formed by filament winding.

Further, as shown by the arrow A7 in FIG. 3, the internal pressure of the liner 2 is set to the specified internal pressure corresponding to the fiber layer of the N + 2nd layer. Next, as shown by the arrow A8 in FIG. 3, the tension applied to the fiber bundle wound around the liner 2 is set to a predetermined tension corresponding to the fiber layer of the N + 2nd layer. Next, as shown by the arrow A9 in FIG. 3, the N + 2nd fiber layer is formed by filament winding. For example, when an abnormality occurs during the formation of the N + 2nd fiber layer, the abnormality determination S115 shown in FIG. 2 determines the abnormality occurrence, and the fiber bundle peeling step S120 is started.

As described above, the fiber bundle peeling step S120 is a step of peeling the fiber bundle from the liner 2 when an abnormality occurs in the fiber bundle wound around the liner 2. In the example shown in FIG. 2, the fiber bundle peeling step S120 includes a winding peeling step S121, a measuring step S122, a layer number calculation step S123, and an internal pressure setting step S124, as described above.

In the winding peeling step S121, for example, the liner 2 supported by the rotating shaft is rotated in the direction opposite to that of the winding step S113, and the fiber layer including the fiber bundle in which the abnormality has occurred is peeled from the liner 2. Further, the measurement step S122 is started in parallel with the unwinding step S121.

As described above, the measurement step S122 is a step of measuring the amount of the fiber bundle wound around the liner 2. Specifically, for example, the amount of fiber bundles wound around the liner 2 is calculated based on the value of the encoder that measures the rotation angle of the liner 2. That is, the liner 2 is rotated in the direction opposite to the winding step S113 in the winding peeling step S121 to peel the fiber bundle from the fiber layer on the outer side of the liner 2, so that the rotation angle of the liner 2 measured by the encoder is reduced. The amount of fiber bundles wound around the liner 2 calculated in the measurement step S122 is also reduced.

Further, the layer number calculation step S123 is started in parallel with the unwinding step S121 and the measurement step S122. As described above, the layer number calculation step S123 is a step of obtaining the number of layers of the fiber layer formed on the outside of the liner 2 based on the amount of the fiber bundle wound around the liner 2. Following the layer number calculation step S123, the same internal pressure setting step S124 as the internal pressure setting step S111 in the fiber layer forming step S110 described above is started. In the internal pressure setting step S124, as described above, the internal pressure of the liner 2 is set according to the number of layers of the fiber layer formed on the outside of the liner 2.

Further, in the high-pressure gas tank manufacturing method S100 shown in FIG. 2, for example, the number of layers of the fiber layer to be unwound in the fiber bundle peeling step S120 is predetermined, and it is determined whether or not the specified number of fiber layers have been peeled off. The number of layers determination S125 is performed. As a result of the predetermined number of layers determination S125, when the fiber layers of the specified number of layers are not peeled off, the above-mentioned unwinding step S121, measurement step S122, layer number calculation step S123, and internal pressure setting step S124 are repeated. When it is determined that the fiber layer of the specified number of layers has been peeled off as a result of the specified number of layers determination S125, the tension setting step S112 of the fiber layer forming step S110 is started, and the fiber layer of the specified number of layers is formed again.

That is, in the fiber layer forming step S110, for example, when an abnormality occurs during the formation of the N + 2nd fiber layer, the N + 2nd fiber layer is unwound as shown by the arrow A10 in FIG. At this time, for example, the fiber bundle is transferred from the liner 2 until the amount of fiber used is about ± 1 [%] with respect to the amount of fiber bundle when the formation of the N + 1th fiber layer is completed, that is, the amount of fiber used. Roll it off.

Next, as shown by the arrow A11 in FIG. 3, the specified internal pressure is set according to the fiber layer of the N + 1th layer. Then, the internal pressure of the liner 2 is reduced until the internal pressure of the liner 2 becomes about ± 1 [%] with respect to the specified internal pressure corresponding to the fiber layer of the N + 1th layer. The internal pressure of the liner 2 can be automatically reduced by, for example, the pressure control mechanism described above.

Further, as shown by the arrow A12 in FIG. 3, the fiber layer of the N + 1th layer is unwound. At this time, for example, the fiber bundle is transferred from the liner 2 until the amount of fiber used is about ± 1 [%] with respect to the amount of fiber bundle when the formation of the Nth fiber layer is completed, that is, the amount of fiber used. Roll it off.

Next, as shown by the arrow A13 in FIG. 3, the specified internal pressure is set according to the fiber layer of the Nth layer. Then, the internal pressure of the liner 2 is reduced until the internal pressure of the liner 2 becomes about ± 1 [%] with respect to the specified internal pressure corresponding to the fiber layer of the Nth layer. The internal pressure of the liner 2 can be automatically reduced by, for example, the pressure control mechanism described above.

Further, as shown by the arrow A14 in FIG. 3, the fiber layer of the Nth layer is unwound. At this time, for example, the fiber bundle is lined up until the amount of fiber used is about ± 1 [%] with respect to the amount of fiber bundle when the formation of the fiber layer of the N-1th layer is completed, that is, the amount of fiber used. Peel off from 2. Then, as shown by the arrow A1 in FIG. 3, the internal pressure of the liner 2 is set to the specified internal pressure corresponding to the fiber layer of the Nth layer, and the fiber bundle is rewound around the liner 2 to obtain the specified number of layers. Form a fiber layer. The above description assumes, for example, a case where an abnormality occurs during the formation of the N + 2nd fiber layer and the restart point after the abnormality treatment is the Nth fiber layer.

Hereinafter, the operation of the high-pressure gas tank manufacturing method S100 of the present embodiment will be described based on the comparison with the conventional technique. FIG. 4 is a graph showing a decrease in burst strength of a conventional high-pressure gas tank depending on the presence or absence of unwinding.

Conventionally, a high-pressure gas tank has been manufactured by winding fibers around a resin container by a filament winding device, raising the internal pressure of the container to a specified pressure for each fiber layer, and winding the fibers with an optimum winding tension. In this filament wandering step, for example, when the step is stopped due to an equipment abnormality or the like, a step of unwinding the fibers wound at the time of occurrence of the abnormality occurs among the laminated fiber layers.

Conventionally, the internal pressure of the resin container is manually released according to the laminated state of the fibers, and the fibers are unwound. Since the internal pressure of the resin container is manually reduced in this way, the fibers wound around the resin container may loosen. When there is such a roll-off process and the fibers wound around the resin container become loose, as shown in FIG. 4, the burst strength of the high-pressure bath tank varies and the strength decreases as compared with the case where there is no roll-off. It may occur. There is also a problem in the safety of the unwinding process.

On the other hand, the method S100 for manufacturing a high-pressure gas tank according to the present embodiment is a method for manufacturing a high-pressure gas tank 1 having a plurality of fiber layers, as described above, in which a fiber bundle impregnated with a resin is wound around a liner 2. The fiber layer forming step S110 for forming the fiber layer and the fiber bundle peeling step S120 for peeling the fiber bundle from the liner 2 when an abnormality occurs in the fiber bundle wound around the liner 2 are provided. Then, in the fiber layer forming step S110 and the fiber bundle peeling step S120, the measurement steps S114 and S122 for measuring the amount of the fiber bundle wound around the liner 2 and the number of layers of the fiber layer are obtained based on the amount of the fiber bundle. The number of layers calculation steps S116 and S123 and internal pressure setting steps S111 and S124 for setting the internal pressure of the liner 2 according to the number of layers of the fiber layer are included.

In the high-pressure gas tank manufacturing method S100 of the present embodiment, the fiber layer forming step S110 includes a layer number calculation step S116 for obtaining the number of layers of the fiber layer based on the amount of fiber bundles, so that the fiber wound around the liner 2 is included. When an abnormality occurs in a bundle, the fiber layer containing the fiber bundle in which the abnormality has occurred can be identified. Further, the fiber layer forming step S110 includes an internal pressure setting step S111 for setting the internal pressure of the liner 2 according to the obtained number of layers of the fiber layer. The internal pressure can be increased. Thereby, in the outer fiber layer, the fiber bundle can be wound around the liner 2 with a higher tension, the looseness of the fiber bundle can be prevented, and the burst strength of the high-pressure gas tank 1 can be improved.

Further, as described above, the fiber bundle peeling step S120 for peeling the fiber bundle from the liner 2 when an abnormality occurs includes the measurement step S122 and the layer number calculation step S123, similarly to the fiber layer forming step S110. The internal pressure setting step S124 and the like are included. Thereby, for example, when the fiber layer including the fiber bundle in which the abnormality has occurred is peeled off from the liner 2, the internal pressure of the liner 2 can be reduced according to the decrease in the number of layers of the fiber layer. As a result, the shrinkage of the liner 2 due to the extreme decrease in the internal pressure of the liner 2 is prevented, and the balance between the internal pressure of the liner 2 and the tension of the fiber bundle can be maintained. Therefore, the generation of a gap between the liner 2 and the fiber bundle can be prevented, the fiber bundle can be prevented from loosening, and the burst strength of the high-pressure gas tank 1 can be improved.

The high-pressure gas tank manufacturing method S100 of the present embodiment includes, for example, an air cylinder that applies tension to fibers that can be independently controlled, and an air system that applies internal pressure to the liner 2 that is a resin container. It can be carried out by using a filament winding apparatus characterized by filament winding while calculating the winding amount by an encoder.

Further, in the high-pressure gas tank manufacturing method S100 of the present embodiment, for example, when the fibers are unwound due to an abnormality in filament winding (FW) in an arbitrary layer in the above apparatus, (1) the amount of the unwound fibers and the FW It has a function to compare with the fiber winding amount calculated inside and judge whether the amount of fiber to be wound in the tank at an arbitrary restart location is normal, and (2) while monitoring the internal pressure with a pressure gauge. It can be carried out using a device characterized by having a function of accurately lowering the pressure to a specified pressure.

According to the above (1), when the winding peeling is performed to the point where it should be restarted, the fiber bundle is peeled off more than necessary, and it is possible to prevent the tank strength from being lowered due to the shortage of the fiber bundle. Further, according to the above (2), it is possible to maintain a balance between the fiber tension at the time of unwinding and the tank internal pressure, prevent the fiber orientation from being disturbed due to the occurrence of loosening of the fiber, and prevent the tank strength from being lowered.

Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment, and there are design changes and the like within a range not deviating from the gist of the present invention. Also, they are included in the present invention.

1 High-pressure gas tank 2 Liner S100 Manufacturing method of high-pressure gas tank S110 Fiber layer forming step (step of forming fiber layer)
S111 Internal pressure setting process (process to set the internal pressure of the liner)
S114 measurement process (process to measure the amount of fiber bundle)
S116 Number of layers calculation process (process to obtain the number of fiber layers)
S120 Fiber bundle peeling step (Step of peeling the fiber bundle)
S122 measurement process (process to measure the amount of fiber bundle)
S123 Layer number calculation process (process to obtain the number of fiber layers)
S124 Internal pressure setting process (process of setting the internal pressure of the liner)

Claims (1)

A method for manufacturing a high-pressure gas tank having a plurality of fiber layers.
The liner is provided with a step of winding a fiber bundle impregnated with a resin around the liner to form the fiber layer, and a step of peeling the fiber bundle from the liner when an abnormality occurs in the fiber bundle wound around the liner.
The steps of forming the fiber layer and peeling off the fiber bundle include a step of measuring the amount of the fiber bundle wound around the liner and a number of layers of the fiber layer based on the amount of the fiber bundle. The internal pressure of the liner is set to a higher specified internal pressure according to the increase in the number of layers of the fiber layer, and the internal pressure of the liner is set to be lower according to the decrease in the number of layers of the fiber layer. A method for manufacturing a high-pressure gas tank, which comprises a step of setting an internal pressure.

Images