阅读说明：本技术 罐的制造方法 (Method for manufacturing can ) 是由 饭田康博 于 2019-05-29 设计创作，主要内容包括：罐的制造方法是通过向具有主体部和设置于主体部的两端的圆顶部的内衬的外周卷绕多层浸渍有环氧树脂的纤维来制造罐的方法。在制造方法中,包括从靠近主体部的外周的一侧朝向远离主体部的外周的一侧将纤维环向卷绕而依次层叠多个环层。在层叠环层时,使主体部的与圆顶部相邻的端部的温度比主体部中除了所述端部以外的其它部分的温度低。(The method of manufacturing a tank is a method of manufacturing a tank by winding a plurality of layers of epoxy resin-impregnated fibers around the outer periphery of a liner having a main body and dome portions provided at both ends of the main body. The manufacturing method includes winding a fiber in a hoop direction from a side close to the outer periphery of the main body toward a side away from the outer periphery of the main body, and sequentially stacking a plurality of hoop layers. When the ring layers are laminated, the temperature of the end portion of the main body portion adjacent to the dome portion is set lower than the temperature of the other portions of the main body portion except for the end portion.)

1. A method of manufacturing a tank by winding a plurality of layers of resin-impregnated fibers around the outer periphery of a liner having a main body portion and dome portions provided at both ends of the main body portion, the method comprising sequentially laminating a plurality of hoop layers by hoop-winding the fibers from a side close to the outer periphery of the main body portion toward a side away from the outer periphery of the main body portion, wherein the temperature of an end portion of the main body portion adjacent to the dome portions is made lower than the temperature of other portions of the main body portion except the end portion when the hoop layers are laminated.

2. The method of manufacturing a can according to claim 1,

the resin is epoxy resin.

3. The method of manufacturing a can according to claim 1 or 2,

the temperature of the end portion of the main body portion adjacent to the dome portion is set to 16 ℃ or lower when the ring layers are laminated.

4. A method of manufacturing a can according to any one of claims 1 to 3,

the temperature of the end portion of the main body portion adjacent to the dome portion is set to 16 ℃ or lower and 5 ℃ or higher when the ring layers are stacked.

5. The method of manufacturing a can according to any one of claims 1 to 4,

when the ring layers are laminated, the temperature of the other part except the end part in the main body part is set to be more than or equal to 20 ℃ and less than or equal to 25 ℃.

6. The method of manufacturing a can according to any one of claims 1 to 5,

when the ring layers are laminated, the fiber is hoop-wound from a 1 st end portion to a 2 nd end portion among the end portions of the main body portion to form an N-th ring layer, and the fiber is folded back at the 2 nd end portion and hoop-wound to form an N + 1-th ring layer outside the N-th ring layer, where N is an integer of 1 or more.

Technical Field

The present invention relates to a method for manufacturing a tank by winding a plurality of layers of resin-impregnated fibers around the outer periphery of a liner.

Background

Tanks such as hydrogen tanks mounted on fuel cell vehicles require high pressure strength and the like in order to ensure safety. As a method for producing such a can, a filament winding/Filament Winding (FW) method is known. Specifically, a reinforcing layer composed of a hoop layer and a spiral layer is formed by repeatedly winding fibers impregnated with an uncured thermosetting resin around the outer periphery of a liner having a main body and dome portions provided at both ends of the main body with a constant tension (i.e., a force of winding the fibers), while rotating the liner, and then the thermosetting resin is cured thermally.

For example, international publication No. 2010/116526 discloses a method for manufacturing a can, the method comprising: the efficiency of developing (improving) the strength of the wound fiber can be improved by optimizing the lamination method of the hoop layer and the spiral layer, and the hoop layers formed by hoop winding the fiber are laminated in order from the side close to the outer periphery of the main body portion of the liner to the side far from the outer periphery of the main body portion of the liner.

Disclosure of Invention

However, when a plurality of ring layers are sequentially laminated on the outer periphery of the main body from the side close to the outer periphery of the main body toward the side away from the outer periphery of the main body, the fibers of the inner ring layer (i.e., the ring layer on the side close to the outer periphery of the liner) are pressed out in the axial direction of the central axis of the liner by the force of the fibers wound around the outer ring layer (i.e., the ring layer on the side away from the outer periphery of the liner) and pressure is applied to the fibers of the inner ring layer. This may cause the fibers of the inner ring layer to slide laterally and shift (shift or move) the arrangement position. In particular, such a positional displacement of the fibers is likely to occur at the end portion of the main body portion adjacent to the dome portion. If the position of the fiber is displaced, the initial strength and fatigue strength of the can are reduced.

The invention provides a method for manufacturing a tank, which can restrain the position deviation of fibers at the end part of a main body part adjacent to a dome part during hoop winding.

A method of manufacturing a tank according to an aspect of the present invention is a method of manufacturing a tank by winding a plurality of layers of resin-impregnated fibers around an outer periphery of a liner having a main body portion and dome portions provided at both ends of the main body portion, and includes winding the fibers circumferentially from a side close to the outer periphery of the main body portion toward a side away from the outer periphery of the main body portion to sequentially laminate a plurality of hoop layers, and when laminating the hoop layers, a temperature of an end portion of the main body portion adjacent to the dome portion is made lower than a temperature of other portions of the main body portion except for the end portion.

In the method of manufacturing a can according to one aspect of the present invention, the temperature of the end portion of the main body portion adjacent to the dome portion is set lower than the temperature of the other portions of the main body portion except for the end portion when the hoop layers are laminated, whereby the viscosity of the resin impregnated in the fibers wound around the end portion can be increased, and therefore the adhesiveness of the resin can be improved. This can suppress positional displacement of the fibers at the end of the main body portion adjacent to the dome portion.

In the method for manufacturing a can according to an aspect of the present invention, the resin may be an epoxy resin. In this way, the excellent adhesiveness of the epoxy resin is utilized, whereby the effect of suppressing the positional deviation of the fibers at the end portion of the main body portion adjacent to the dome portion can be improved.

In the method of manufacturing a can according to an aspect of the present invention, the temperature of the end portion of the main body portion adjacent to the dome portion may be 16 ℃ or lower when the ring layers are stacked. Thus, the amount of positional deviation of the fibers at the end of the main body adjacent to the dome portion can be suppressed to 2mm or less.

In the method of manufacturing a can according to an aspect of the present invention, the temperature of the end portion of the main body portion adjacent to the dome portion may be 16 ℃ or lower and 5 ℃ or higher when the ring layers are laminated.

In the method of manufacturing a can according to an aspect of the present invention, the temperature of the portion of the body portion other than the end portion may be set to 20 ℃ or higher and 25 ℃ or lower when the ring layers are laminated.

In the method of manufacturing a can according to an aspect of the present invention, when the hoop layers are stacked, the fiber may be hoop-wound from a 1 st end portion to a 2 nd end portion among the end portions of the body portion to form an N-th hoop layer, and the fiber may be folded back at the 2 nd end portion and hoop-wound to form an N +1 th hoop layer outside the N-th hoop layer, where N is an integer of 1 or more.

According to the above aspect, it is possible to suppress positional displacement of the fiber at the end portion of the main body portion adjacent to the dome portion at the time of hoop winding.

Drawings

Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, wherein like reference numerals represent like elements, and wherein:

fig. 1 is a sectional view showing the configuration of a can.

Fig. 2 is a schematic view illustrating a method of manufacturing a can according to an embodiment.

Fig. 3 is a graph showing the relationship between the adhesive force of the resin and the temperature.

Fig. 4 is a graph showing a relationship between the amount of positional deviation of the fiber and the temperature.

Fig. 5 is a graph showing the measurement results of the burst pressure in the example can and the comparative example can.

Fig. 6A is a schematic diagram for explaining formation of a hoop layer based on hoop winding.

Fig. 6B is a schematic diagram for explaining formation of a spiral layer based on spiral winding.

Detailed Description

Hereinafter, an embodiment of a method for manufacturing a can will be described with reference to the drawings, and the structure of the can 1 will be described based on fig. 1.

Fig. 1 is a sectional view showing the configuration of a tank 1. The tank 1 is a high-pressure tank mounted on a fuel cell vehicle, for example, and can store high-pressure hydrogen therein. The tank 1 includes a liner 10 having a fluid storage space, and an FRP layer (fiber reinforced plastic layer) 20 in close contact with (close contact with) the outer periphery of the liner 10.

The liner 10 has a gas barrier property against hydrogen gas. The liner 10 is a hollow container having a substantially cylindrical body portion 11 and substantially hemispherical dome portions 12 provided at both left and right ends of the body portion 11. Openings are formed in the top portions of the two dome portions 12, respectively, and a valve side port ring 13 is inserted into one of the openings, and a port side port ring 14 is inserted into the other.

The liner 10 is integrally formed by a rotational blow molding method using a resin member such as polyethylene or nylon. The liner 10 may be formed of a light metal such as aluminum instead of the resin member. The liner 10 may be formed by joining a plurality of members divided by injection extrusion molding or the like, instead of the manufacturing method of integral molding such as the rotational blow molding method.

The FRP layer 20 includes a plurality of hoop layers 21 laminated to cover the outer periphery of the body portion 11 of the liner 10, and a plurality of spiral layers 22 covering the entire liner 10 so as to cover the hoop layers 21 and the dome portion 12.

As shown in fig. 6A, the loop layer 21 is a fiber layer as follows: the liner 10 is formed by hoop-winding the epoxy resin-impregnated fiber 15 in the circumferential direction of the body 11 at a winding angle substantially perpendicular to the central axis L of the liner. Here, "substantially perpendicular" includes both 90 ° and angles before and after 90 ° that may be generated by shifting the winding positions of the fibers 15 so that the fibers 15 do not overlap with each other.

On the other hand, as shown in fig. 6B, the spiral layer 22 is formed by spirally winding the fibers 15 in the circumferential direction of the body portion 11 and the dome portion 12 at a winding angle greater than 0 ° and less than 90 ° with respect to the central axis L of the liner 10. In addition, the spiral winding is further classified into low-angle spiral winding and high-angle spiral winding according to the winding angle. The low-angle helical winding, that is, the helical winding in the case where the winding angle is small (for example, greater than 0 ° and 30 ° or less), is a winding method in which the turn-back of the fiber 15 in the winding direction in the dome portion 12 occurs before the fiber 15 makes one turn around the center axis L. The high-angle helical winding, that is, the helical winding in the case where the winding angle is large (for example, more than 30 ° and less than 90 °), is a winding method in which the fiber 15 is wound at least once around the central axis L in the main body portion 11 before the turn-back of the fiber 15 in the winding direction in the dome portion 12 occurs. Further, fig. 6B shows low-angle helical winding.

The method of manufacturing the can 1 having the above configuration mainly includes: the method includes a ring layer laminating step of laminating a plurality of ring layers 21 on the outer periphery of the body 11, a spiral layer laminating step of laminating a plurality of spiral layers 22 covering the entire liner 10, and a thermosetting step of thermosetting the laminated ring layers 21 and spiral layers 22.

In the hoop layer laminating step, as shown in fig. 2, a plurality of hoop layers 21 are sequentially laminated by hoop-winding the epoxy resin impregnated fiber 15 from a side close to the outer periphery of the main body 11 of the liner 10 to a side away from the outer periphery of the main body 11 of the liner 10. Specifically, in a state where the liner 10 is attached to a rotary drive unit (not shown), the liner 10 is rotated about the central axis L of the liner 10, and a reel (not shown) on which the epoxy resin-impregnated fiber 15 is wound is reciprocated in the direction of the central axis L, thereby discharging the fiber 15 toward the liner 10.

Then, the fiber 15 is hoop-wound from one end (1 st end) of the main body 11 toward the other end (2 nd end), thereby forming a 1 st hoop layer 21 on the outer periphery of the main body 11. One end of the body 11 is, for example, an end located on the right side of the drawing in fig. 2, and the other end is, for example, an end located on the left side of the drawing in fig. 2. Next, the fiber 15 is folded back at the other end of the body 11, and the fiber 15 is hoop-wound from the other end toward the one end of the body 11, whereby the loop layer 21 of the 2 nd layer is laminated on the outside of the loop layer 21 of the 1 st layer (i.e., on the side away from the outer periphery of the liner 10). Next, the ring layer 21 of the 3 rd layer is laminated outside the ring layer 21 of the 2 nd layer, the ring layer 21 of the 4 th layer is laminated outside the ring layer 21 of the 3 rd layer, and the ring layer 21 of the N +1 th layer is laminated outside the ring layer 21 of the N-th layer in this order …. Hereinafter, the one end and the other end of the body 11 may be collectively referred to as "end of the body 11". One end and the other end of the body 11 are adjacent to the dome 12.

Here, in order to reduce the step difference at the boundary between the main body portion 11 and the dome portion 12, it is preferable to stack a plurality of ring layers 21 such that the left and right ends of the stacked ring layers 21 are inclined so as to be shifted inward in stages in the direction of the central axis L. That is, the length of the cross section taken along the central axis L of the ring layer 21 of the (N + 1) th layer is shorter than the length of the cross section taken along the central axis L of the ring layer 21 of the (N) th layer.

In the hoop layer laminating step, the plurality of hoop layers 21 are laminated in a state where the temperature of the end portion of the main body portion 11 adjacent to the dome portion 12 is lower than the temperature of the other portions of the main body portion 11 except for the end portion. Specifically, as shown in fig. 2, 1 cold air blowing unit 30 is disposed above the liner 10 at each of positions corresponding to one end portion and the other end portion of the main body 11 adjacent to the dome portion 12, and a warm air blowing unit 31 is disposed at a position corresponding to the other portion of the main body 11 except for the one end portion and the other end portion.

The cold air blowing unit 30 has a nozzle for blowing cold air to the surface of the end of the main body 11. The warm air blowing section 31 has a plurality of nozzles that are provided at predetermined intervals in the direction of the central axis L of the liner 10 and blow warm air to the surface of the other portion of the main body 11 except for the end portion. In the hoop lamination step, the temperature of the end portion of the main body 11 adjacent to the dome portion 12 is controlled by the cold air blower 30, and the temperature of the other portion of the main body 11 except the end portion is controlled by the warm air blower 31, thereby realizing a temperature difference between the end portion of the main body 11 and the other portion except the end portion.

Here, for the following reason, it is preferable that the temperature of the end portion of the body portion 11 adjacent to the dome portion 12 is 16 ℃. That is, the occurrence of positional displacement of the fibers during lamination of the ring layers has a great influence on the viscosity of the resin impregnated in the fibers and the adhesiveness of the resin, and particularly the influence of the adhesiveness of the resin is the greatest. Here, the temperature refers to the surface temperature of the tank 1.

Fig. 3 is a graph showing the relationship between the adhesive force of the resin and the temperature, and fig. 4 is a graph showing the relationship between the amount of positional deviation of the fiber and the temperature. As shown in FIG. 3, since normal FW is carried out at room temperature (about 20 ℃), the adhesion at this time is 1500gF or less, and when the temperature is 16 ℃ or less, the adhesion exceeds 1500 gF. As shown in fig. 4, when the temperature is 16 ℃ or lower, the amount of displacement of the fiber position is 2mm or lower and smaller than the standard width of the fiber width, and therefore the amount of displacement of the fiber position can be regarded as almost zero. Therefore, by setting the temperature of the end portion of the main body portion 11 adjacent to the dome portion 12 to 16 ℃ or lower, the positional displacement of the fibers at the end portion can be suppressed.

Here, the temperature of the end portion of the body 11 adjacent to the dome portion 12 is more preferably 5 to 16 ℃. As described above, since the temperature of the end portion of the main body 11 adjacent to the dome portion 12 is 16 ℃ or lower, the positional deviation of the fibers at the end portion can be suppressed, and therefore, for example, the temperatures of the left and right end portions may be set to 0 ℃ or negative, but in this case, there is a problem that a device for setting the temperature to 0 ℃ or negative is changed or added, and the cost is increased. In consideration of the fact that the temperature can be handled only by existing equipment, the temperature of the end portion of the main body portion 11 adjacent to the dome portion 12 is preferably 5 ℃.

On the other hand, in the ring layer laminating step, the temperature of the other portion of the main body 11 except the end portion is set to 20 to 25 ℃. In this way, since the permeability of the resin can be improved by lowering the viscosity of the resin impregnated in the fibers 15, the residual void amount of the entire ring layer 21 can be reduced. As a result, the crack can be prevented from propagating (spreading) due to the void, and the effect of improving the pressure resistance of the can 1 can be expected.

In the spiral layer laminating step subsequent to the ring layer laminating step, a plurality of spiral layers 22 are laminated so as to entirely cover the liner 10 so as to cover the laminated ring layers 21 and dome portion 12.

In the thermosetting step subsequent to the spiral layer laminating step, the liner 10 having the laminated ring layer 21 and spiral layer 22 is placed in a thermostatic bath, and heated at a temperature of, for example, about 85 ℃. Thereby, the can 1 is manufactured.

In the method of manufacturing the can 1 of the present embodiment, in the hoop lamination step, the temperature of the end portion of the main body portion 11 adjacent to the dome portion 12 is set lower than the temperature of the other portions of the main body portion 11 except for the end portion, so that the viscosity of the resin (epoxy resin in the present embodiment) impregnated in the fibers 15 wound around the end portion can be increased, and therefore the tackiness (i.e., adhesive force) of the resin can be increased. This can suppress the positional displacement of the fibers at the end of the main body 11 adjacent to the dome portion 12, and therefore can improve the pressure resistance of the can 1, and can produce a high-quality can 1.

In the method of manufacturing the can according to the present embodiment, since the resin is an epoxy resin, the effect of suppressing the positional deviation of the fibers at the end portion of the main body portion 11 adjacent to the dome portion 12 can be improved by utilizing the excellent adhesiveness of the epoxy resin. In the hoop lamination step, the temperature of the end portion of the main body portion 11 adjacent to the dome portion 12 is set to 16 ℃ or lower, and therefore the amount of positional displacement of the fibers at the left and right end portions can be suppressed to 2mm or lower.

The inventors of the present invention also tried cans of examples by using the method of manufacturing a can of the present embodiment, and compared and evaluated the burst pressure of the can of comparative example. The results are shown in FIG. 5. In fig. 5, the data on the right side are the measurement results of the burst pressure of the can of the example, that is, the can manufactured in a state in which the temperature (16 ℃ or lower) of the end portion of the body portion adjacent to the dome portion is lower than the temperature of the other portion of the body portion except for the end portion. On the other hand, the data on the left side are the measurement results of the burst pressure of the can of the comparative example, that is, the can manufactured in a state where the temperature of the entire body is the same. As is clear from fig. 5, when the temperature of the end portion of the main body portion adjacent to the dome portion is 16 ℃.

While the embodiments of the present invention have been described above in detail, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the spirit of the present invention described in the claims. For example, in the above embodiment, the epoxy resin is described as the resin impregnated in the fiber, but a polyester resin, a polyamide resin, or the like may be used.

In the above embodiment, the temperature of the end portion of the main body portion adjacent to the dome portion and the temperature of the other portion are controlled by the cold air blowing portion and the hot air blowing portion, respectively.