JP6728889B2 - Cylinder manufacturing apparatus and manufacturing method thereof - Google Patents

Description

The present invention relates to a cylindrical body manufacturing apparatus and a manufacturing method thereof.

Carbon fiber is widely used for general industrial applications such as automobiles because of its excellent mechanical properties, especially high specific strength and high specific elastic modulus, and various molding methods have been developed. There is. Among them, the filament winding molding method (hereinafter sometimes referred to as FW (Filament Winding) molding method) is widely applied to carbon fibers because of its excellent moldability and the characteristics of the obtained carbon fiber reinforced composite material.

In particular, as a fuel container for fuel cell automobiles, natural gas automobiles, and the like, which has been attracting attention in recent years, a pressure container formed by a FW molding method using carbon fiber as a reinforcing fiber is used in order to obtain lightweight and high-performance characteristics. Have begun. The pressure vessel is reinforced by winding a carbon fiber reinforced plastic material (hereinafter referred to as CFRP: Carbon Fiber Reinforce Plastic) having a very high strength per unit density around the outer surface of a mandrel such as a resin or metal inner vessel. ..

When manufacturing such a pressure vessel, for example, as in the FW molding method, after the fiber bundle of carbon fibers or the like is impregnated with a resin solution such as an epoxy resin, it is wound around the outer surface of the resin inner vessel and then the resin is cured. Then, the reinforcing layer is formed.

When a pressure vessel is manufactured by the FW molding method, when the fiber bundle is unwound from the bobbin, the fiber bundle is unwound while moving symmetrically, so that the fiber bundle is rotated and twisted, resulting in variations in width and thickness. It tends to occur. Further, when the fiber bundle is wound around the mandrel, the delivery eye moves over a wide range, so that the fiber bundle is twisted, and variations in width and thickness are likely to occur. When the fiber bundle is twisted, tension is not evenly applied to the twisted portion, so that the strength is lowered and the molded body is easily broken from that portion, which causes the original composite properties to not be sufficiently exhibited.

In addition, when the fiber bundle passes through the guide, the fiber bundle is scratched and damaged, or the scraped lint (hereinafter also referred to as fluff) accumulates on the guide, which requires fluff removal work. It becomes.

As described above, in the FW molding method, it is important to uniformly wind the fiber bundle around the mandrel while applying a constant tension, and to suppress the generation and accumulation of fluff.

In Patent Document 1 (JP 2012-154000A), "a yarn guide is composed of a guide roll and a support member that supports the guide roll, and the support member is twisted at right angles to the rotation axis of the guide roll. The guide roll is tilted with respect to the yarn path by the rotation around the rotation axis of the support member in response to the fluctuation of the yarn path (see claim 4). The structure is described, "By using a specific precursor and applying a specific winding method, the yarn width is uniform and the yarn width is uniform while keeping the cross-sectional shape rectangular when unwinding. The yarn bundle is pulled out without rotation, and when it is wound up on a mandrel or the like after impregnated with a resin, the yarn bundle is prevented from being reversed and spread unevenness is prevented, and the fluctuation of the yarn width does not occur.

Patent Document 1 discloses that a yarn guide mechanism that guides a fiber bundle that moves out of the yarn path in the original yarn path direction is provided so that the yarn width is uniform and the yarn bundle is pulled out without rotating. ing. However, the final guide roller 23 is parallel to the axis of the pressure roller 16 and the winding direction of the package 14, and the fiber bundle is twisted at about 90° in the traverse device. There is a concern that the bundle may be widened, twisted, or folded, resulting in large tension fluctuations. In addition, the yarn guide mechanism becomes complicated, and in a forming method such as the FW forming method in which fiber bundles are fed from a plurality of bobbins, there is also a problem that it takes time to adjust the twisted yarn path.

In Patent Document 2 (Japanese Unexamined Patent Publication No. 2005-88536), "for both a portion to be guided immediately after drawing out a plurality of reinforcing fiber bundles pulled out from a large number of bobbins and a portion to be guided immediately downstream of the same portion," , A pair of fixed guides are arranged, an independently rotating guide roller is arranged in the conveying path of the reinforcing fiber bundle from each bobbin to the core, and each reinforcing fiber bundle being conveyed is cored. A guide roller of integral rotation type is arranged at the outlet of the traverse that feeds to the material" is described, "Tension can be uniformly applied to each reinforcing fiber bundle, and twists mixed in the reinforcing fiber bundle (Twisting) is configured to be removed, and a decrease in strength of the reinforcing fiber bundle can be prevented.”

However, in the configuration of Patent Document 2, when the fiber bundle passes through the fixed guide, the frictional force becomes large and the fiber bundle is easily scraped. In addition, the generated fluff accumulates on the guide, and frequent fluff removal work is required, which may deteriorate work efficiency, and damage the fiber bundle due to rubbing, which may reduce the strength of the molded body. Further, in the FW molding method, the fiber bundle tends to rotate and twist easily as the traverse portion in front of the mandrel moves, but no countermeasure is taken for the reversal of the fiber bundle at the traverse portion.

In Patent Document 3 (Japanese Patent Laid-Open No. 2011-148146), “While moving an opening portion for opening a reinforcing fiber bundle using the opening roller and the opened reinforcing fiber using a resin impregnating roller, In a prepreg manufacturing apparatus having a resin impregnated portion that is impregnated with a resin to form a composite, a configuration is described in which the rotational speed of the opening roller is lower than the rotational speed of the resin impregnated roller, and "reinforced fiber bundle The effect of opening the reinforcing fiber bundle while preventing scratches and fluffs by applying an appropriate tension to the reinforcing fibers and applying an appropriate friction to the reinforcing fibers on the surface of the opening roller is disclosed.

However, in the configuration of Patent Document 3, by increasing the rotation speed of the resin impregnating roller faster than the rotation speed of the fiber opening roller, the tensile tension applied to the fibers between these rollers increases, but on the other hand, the fiber May be heavy and may cause damage. Further, increasing the tensile tension is not sufficient to prevent fuzzing. Furthermore, since the prepreg manufacturing process is slower than the FW molding process and there is no wide range movement of the delivery eye, it is difficult to verify the effect of Patent Document 3 in the FW molding method. Furthermore, even if the speed ratio between the filament opening roller and the impregnating roller is 70:100, there remains a concern that the twisted fiber bundle will be flowed as it is and contained in the molded body.

In Patent Document 4 (Japanese Patent Laid-Open No. 2005-325191), “a driving roller that rotates at a peripheral speed Vr in the same direction as the conveying direction of the reinforcing fiber sheet is contacted, and the peripheral speed Vr is set to the conveying speed Vf of the reinforcing fiber sheet. On the other hand, a constitution of a reinforcing fiber sheet obtained by opening a plurality of traveling reinforcing fiber bundles aligned in one direction within the range of 0<Vr/Vf≦0.9 is described. By eliminating the meandering of the reinforcing fibers during opening and widening, the disorder of the orientation of the single fibers that make up the reinforcing fiber bundle can be improved, and the occurrence of crack defects can be prevented while the quality and quality of the prepreg are low. Can be manufactured" effect is disclosed.

However, in the configuration of Patent Document 4, the method of disposing the drive roller has not been examined, and thus it is difficult to prevent twisting. In addition, the driving roller is driven at a speed lower than the conveying speed of the reinforcing fiber sheet to bring it into contact with the reinforcing fiber sheet. However, for the reinforcing fiber sheet pulled out from the opening means for opening the reinforcing fiber bundle, However, the tension applied to the reinforcing fiber sheet may be disturbed or fluctuated by simply bringing the driving roller that is driven at a low speed into contact, which may lead to a decrease in the strength of the reinforcing fiber bundle. Further, since the production of the prepreg is targeted, the feeding speed of the fiber bundle is also 5 to 6 m/min, and it is assumed that the running speed is much slower than the speed of the general FW molding method, at least 30 m/min. Absent. Further, in the FW molding method, a delivery eye is used for molding a product having a complicated shape, and the fiber bundle is moved over a wide range, but the production of the prepreg does not assume the use of the delivery eye. For the above reasons, in FW molding, for example, a high traveling speed of a fiber bundle of 30 m/min or more, or a delivery eye is used for molding a product having a complicated shape, and occurs when a wide range of fiber bundles of 1 m or more are moved. Measures for easy reversal of fiber bundles and suppression of tension fluctuations are insufficient and problems remain.

JP 2012-154000 JP 2005-88536 A JP, 2011-148146, A JP, 2005-325191, A

In view of the problems of the prior art, the present invention prevents the twisted fiber bundle generated in the process of winding a fiber bundle having a certain number of filaments around a mandrel from being wound around a molded body. To aim. Further, by alleviating the tension fluctuation caused by the twisted fiber bundle, it is possible to suppress the decrease in strength of the molded body, further suppress the fluffing of the fiber bundle, and reduce the fluffing work. And a method for manufacturing the same.

In order to solve the above problems, the present invention employs the following means. That is,
[1] An apparatus for manufacturing a tubular body, which unwinds the fiber bundle from a bobbin wound with a fiber bundle obtained by bundling a plurality of continuous fibers, and winds the fiber bundle around a mandrel.
Between the bobbin and the mandrel, a guide roll group that conveys the fiber bundle is provided,
The guide roll group has at least a first guide roll that first comes into contact with the fiber bundle, and a second guide roll that is arranged on the downstream side of the first guide roll,
The first guide roller and the second guide roller are arranged so as to contact different surfaces of the fiber bundle ,
The peripheral speed of the second guide roller is slower than the delivery speed of the fiber bundle,
When the winding angle θ (°) of the fiber bundle in contact with the second guide roller is 30°≦θ≦170° and 30°≦θ<70°, the formula (1) is satisfied and 70°≦ In the case of θ≦170°, the manufacturing apparatus for a cylinder, which satisfies the formula (2).
180/sin(θ/2)≦L≦1500 (30°≦θ<70°) (1)
313≦L≦1500 (70°≦θ≦170°) (2)
Here, L (mm) is the distance between the center of the first guide roller and the center of the second guide roller.
[2] The apparatus for manufacturing a cylinder according to [1], wherein the peripheral speed of the first guide roller is the same as the delivery speed of the fiber bundle.
[ 3 ] The apparatus for manufacturing a cylinder according to [ 1 ], wherein the peripheral speed of the second guide roller is 0.001 to 0.5 times the delivery speed of the fiber bundle.
[ 4 ] The apparatus for manufacturing a tubular body according to any one of [ 1 ] to [ 3 ], wherein the delivery speed of the fiber bundle is 30 to 100 m/min.
[ 5 ] The guide roller group further has a third guide roller downstream of the second guide roller,
The first guide roller is provided with a sensing means for measuring the tensile tension of the fiber bundle, and the first guide roller is provided with a control means for controlling the peripheral speed of the third guide roller according to the variation of the tensile tension. [ 1 ] to [ 4 ] The cylindrical body manufacturing apparatus according to any one of [ 1 ] to [ 4 ].
[ 6 ] A tubular body according to any one of [ 1 ] to [ 5 ], further comprising a resin impregnated portion for impregnating the fiber bundle with a molten resin, between the bobbin and the mandrel. apparatus.
[ 7 ] The apparatus for manufacturing a cylinder according to [ 6 ], wherein the guide roller group is arranged between the bobbin and the resin-impregnated portion.
[ 8 ] The apparatus for manufacturing a cylinder according to [ 6 ] or [ 7 ], wherein the guide roller group is arranged between the resin-impregnated portion and the mandrel.
[ 9 ] A step of pulling out the fiber bundle from a bobbin around which a fiber bundle obtained by bundling a plurality of continuous fibers is wound,
A step of the fiber bundle to convey the causes resin impregnated prior Symbol fiber bundle from the bobbin,
A step of winding the conveyed fiber bundle around a mandrel,
A method of manufacturing a cylinder having at least:
The conveying step includes a guide roller group having at least a first guide roll that first comes into contact with the fiber bundle and a second guide roll that is arranged on the downstream side of the first guide roll,
The first guide roller and the second guide roller convey the fiber bundle so as to come into contact with different surfaces of the fiber bundle ,
The peripheral speed of the second guide roller is slower than the delivery speed of the fiber bundle,
When the winding angle θ (°) of the fiber bundle in contact with the second guide roller is 30°≦θ≦170° and 30°≦θ<70°, the formula (1) is satisfied and 70°≦ When θ≦170°, the method for manufacturing a cylindrical body is characterized by satisfying the expression (2).
180/sin(θ/2)≦L≦1500 (30°≦θ<70°) (1)
313≦L≦1500 (70°≦θ≦170°) (2)
Here, L (mm) is the distance between the center of the first guide roller and the center of the second guide roller.

According to the present invention, when a carbon fiber bundle having a certain number of filaments is impregnated with a resin and then the fiber bundle is wound around a mandrel, it is possible to prevent the twisted fiber bundle from being wound around the molded body as it is. As a result, the tension of the fiber bundle can be stabilized, so that the strength of the molded body can be prevented from decreasing. Further, since the fluffing of fibers can be suppressed, the frequency of fluffing work is reduced and the workability is improved.

It is the schematic of the whole structure of an example of the manufacturing flow of the cylinder concerning the embodiment of the present invention. It is a schematic perspective view of the state which a fiber bundle is pulled out from a cylindrical bobbin. It is a top view of the state where the fiber bundle was twisted and inverted. It is a perspective view of the state where the twisted part of the fiber bundle was clamped between the first guide roller and the second guide roller. FIG. 6 is a schematic cross-sectional view showing a relationship between a winding angle θ and a distance L between the guide rollers when the fiber bundle is wound around the second guide roller. FIG. 7 is a relationship diagram between a winding angle θ and a distance L. It is a perspective view of the state which cannot fully open a fiber bundle. FIG. 3 is a schematic configuration diagram of a guide roller group in which a first upstream guide roller is provided with a sensing unit that measures the tensile tension of the fiber bundle. It is a schematic diagram showing fluctuation of tension measured in the 1st guide roller. It is a schematic diagram which arranged two or more 2nd guide rollers. It is a schematic diagram of the whole composition of an example of a manufacturing flow of a cylinder which arranged a guide roller group between a bobbin and a resin impregnation part. It is the schematic of the whole structure of an example of the manufacturing flow of the cylindrical body which has arrange|positioned the guide roller group between the resin impregnation part and the mandrel. FIG. 3 is a schematic view of an example of the overall configuration of a manufacturing flow of a cylindrical body in which a guide roller group is arranged between a bobbin and a resin impregnated portion and between a resin impregnated portion and a mandrel.

Hereinafter, embodiments will be described with reference to the drawings. The present invention is not limited to the drawings and the embodiments.

The manufacturing apparatus of the cylindrical body according to the present invention is a manufacturing apparatus of a cylindrical body that is wound around a mandrel by feeding out the fiber bundle from a bobbin wound with a fiber bundle in which a plurality of continuous fibers are bundled, and the bobbin and the mandrel. A guide roll group that conveys the fiber bundle is provided therebetween, and the guide roll group is arranged at least on the first guide roll that first contacts the fiber bundle and on the downstream side of the first guide roll. At least a second guide roller is provided, and the first guide roller and the second guide roller are arranged so as to come into contact with different surfaces of the fiber bundle, and the peripheral speed of the second guide roller is the fiber. When the winding angle θ (°) of the fiber bundle which is slower than the bundle feeding speed and is in contact with the second guide roller is 30°≦θ≦170° and 30°≦θ<70° ( When the formula (1) is satisfied and 70°≦θ≦170°, the formula (2) is satisfied.
180/sin(θ/2)≦L≦1500 (30°≦θ<70°) (1)
313≦L≦1500 (70°≦θ≦170°) (2)

Here, L (mm) is the distance between the center of the first guide roller and the center of the second guide roller.

As shown in FIG. 1, the tubular body manufacturing apparatus mainly includes a fiber bundle sending unit 100 that is responsible for a fiber bundle sending step, a guide roll group 200 that carries the sent fiber bundle, and a winding step that winds the carried fiber bundle. The fiber bundle winding unit 300 that plays a role in this is arranged in this order.

In the fiber bundle delivery unit 100, the fiber bundle 103 is pulled out from the bobbin 101, and then tension is applied by the creel roller 102. After that, the fiber bundle 103 is delivered to the guide roll group 200. The sent out fiber bundle 103 is guided by the guide roll group 200 and is conveyed to the fiber bundle winding section 300. In the fiber bundle winding unit 300, the conveyed fiber bundle 103 is collected by the delivery eye 301 and wound on the mandrel 302.

Next, as shown in FIG. 2, when the fiber bundle 103 is pulled out from the cylindrical bobbin 101, the fiber bundle 103 is continuously pulled out from the front side 104 of the bobbin toward the back side, and the farthest side. After being pulled out from 105, the fiber bundle 103 is turned like a reversal path 106, and this time the fiber bundle 103 is pulled out from the back side to the front side. After the fiber bundle 103 is pulled out from the innermost side 105, when the fiber bundle 103 is turned toward the front side, the fiber bundle 103 is easily inverted and twisted. Similarly, when the fiber bundle 103 is pulled out from the front side 104 and then turned toward the back side, the fiber bundle 103 may be inverted and twisted easily.

In this case, as shown in FIG. 3, when the fiber bundle 103 is twisted and inverted, tension is not uniformly applied to the twisted portion 107 of the fiber bundle 103, and the strength of that portion decreases. .. If it is wound around the mandrel 302 as it is, the twisted portion 107 becomes a starting point of breakage, and if it is used for a pressure vessel, for example, the strength may be lowered. Further, when the twisted portion 107 is conveyed in the conveying direction 108 and passes through the guide roller 202, the width of the fiber bundle 103 changes, so that the frictional force with the guide roller 202 fluctuates, which causes a fluctuation in tension. ..

Here, the configuration of the guide roller group 200 will be described.

As shown in FIG. 4, the guide roll group 200 includes at least a first guide roll 201 that first comes into contact with the fiber bundle 103, and a second guide roll 202 that is arranged downstream of the first guide roll 201. The first guide roller 201 and the second guide roller 202 are arranged so as to come into contact with different surfaces of the fiber bundle 103. That is, the first guide roller 201 rotates in the same direction 205 with respect to the conveying direction 108 of the fiber bundle 103, and the second guide roller 202 rotates in the same direction 206 with respect to the conveying direction 108 of the fiber bundle 103. The first guide roller 201 and the second guide roller 202 are configured to rotate in opposite directions. Thereby, both surfaces of the fiber bundle 103 can be kept in sufficient contact with the first guide roller 201 and the second guide roller 202, and the tension can be uniformly applied. Further, it is possible to secure a certain amount of wrapping angle of the fiber bundle 103 around the second guide roller 202.

Next, the relationship between the winding angle θ (°) of the fiber bundle 103 around the second guide roller 202 and the distance L (mm) between the center of the first guide roller 201 and the center of the second guide roller 202. Will be described.

As shown in FIG. 5, the winding angle θ is the angle between the lines connecting the point where the fiber bundle 103 starts to contact the second guide roller 202 and the point where the fiber bundle 103 starts to separate from the second guide roller 202, respectively. 207, and the distance L is the distance 208 between the center of the first guide roller 201 and the center of the second guide roller 202.

FIG. 6 shows a relationship diagram between the winding angle θ (207) and the distance L (208). The horizontal axis represents the winding angle θ (207), and the vertical axis represents the distance L (208). By disposing the first guide roller 201 and the second guide roller 202 so as to be included in the area surrounded by the curved line, the fiber bundle 103 is disposed between the first guide roller 201 and the second guide roller 202. The twisted portion 107 can be retained.

Here, assuming that the force with which the fiber bundle 103 is pressed against the guide roller is Ts(N) and the tension applied to the fiber bundle 103 is Tf(N), the wrapping angle θ has a relationship of equation (3). It has been known.
Ts=2·Tf·sin(θ/2) (3)

The bundle width of the fiber bundle 103 is opened according to the size of Ts. When FW molding is performed at a constant Tf, Ts varies depending on the winding angle θ (207). Therefore, the bundle width of the fiber bundle 103 changes according to the winding angle θ (207).

As shown in FIG. 4, in order to retain the twisted portion 107 of the fiber bundle 103 in front of the second guide roller 202, the fiber bundle 103 is provided with an opened region having a bundle width 109 of a certain value or more. It is necessary to have.

If θ is less than 30°, sufficient force cannot be applied to the fiber bundle 103 to open the fiber bundle 103 on the second guide roller 202, the fiber bundle 103 cannot be opened sufficiently, and the twisted portion 107 is retained. It may be difficult to place.

Further, in the range of 30°≦θ≦70°, Ts is slightly weakened, so that it is necessary to secure the distance L (208) above a certain level. That is, by setting the distance L(208) to be 180/Sin(θ/2) mm or more in conjunction with the winding angle θ(207), the winding angle θ(207) becomes smaller and the distance L( By increasing 207), the distance L (208) at which the twisted fiber bundle can be opened can be secured, and the twisted portion 107 can be retained in front of the second guide roller 202.

On the other hand, as shown in FIG. 7, if the distance L (208) is less than 180/sin (θ/2) mm, the fiber bundle 103 cannot be sufficiently opened, and a certain width or more such as a narrow bundle width 110 is not reached. Since it is difficult to secure the opened area, it may be difficult to retain the twisted portion 107. If Tf is increased to open the fiber bundle 103, the fiber bundle is likely to be damaged.

Further, in the range of 70°<θ≦170°, by setting the distance L (208) to 313 mm or more, it is possible to secure a distance at which the fiber bundle 103 can be sufficiently opened, and the twisted portion 107 is fastened. Can be placed.

On the other hand, if the length is less than 313 mm, the distance L (208) for sufficiently opening the fiber bundle 103 cannot be secured, and the fiber bundle 103 can be sufficiently opened like the opening area 110 shown in FIG. 7. Therefore, it may be difficult to retain the twisted portion 107.

When the wrapping angle θ (207) exceeds 170°, the contact area between the guide rollers 201 and 202 and the fiber bundle 103 increases, so that the fiber bundle 103 is easily damaged such as torque disturbance and fluffing. ..

If the distance L (208) is longer than 1500 mm, the fiber bundle 103 is likely to vibrate during conveyance, and tension fluctuation may occur. In addition, the production apparatus itself becomes large, which is against the downsizing of production equipment.

Preferably, the winding angle θ(207) is 40°≦θ≦150°, and in the case of 40°≦θ≦70°, the distance L(208) is expressed by equation (4) as 70°<θ≦150. In the case of °, it is preferable to satisfy the expression (5).
180/sin(θ/2)≦L≦1300 (40°≦θ≦70°) (4)
313≦L≦1300 (70°<θ≦150°) (5)

Furthermore, more preferably, the winding angle θ(207) is 50°≦θ≦130°, and in the case of 50°≦θ≦70°, the distance L(208) is expressed by equation (6) as 70°<θ. In the case of ≦130°, it is preferable to satisfy the relation of the expression (7).
180/sin(θ/2)≦L≦1000 (50°≦θ≦70°) (6)
313≦L≦1000 (70°<θ≦130°) (7)

The guide rollers 201 and 202 have a cylindrical shape, and the entire length needs to be wide enough to prevent the fiber bundle 103 from falling off the rollers even when the fiber bundle 103 moves in association with the movement of the delivery eye. Further, as the guide rollers 201 and 202, it is preferable to use one independent roller for each bundle of the fiber bundle 103 pulled out from the bobbin 101.

The material forming the guide rollers 201 and 202 is, for example, a metal such as iron, and the surface treatment may be, for example, hard chrome plating or satin surface treatment. The load received from the fiber bundle passing on the guide roller is preferably about 15 to 40 N when the number of filaments is 12,000, and about 30 to 80 N when the number of filaments is 24,000.

It is important that the peripheral speed of the second guide roller 202 is slower than the delivery speed of the fiber bundle 103.

By making the peripheral speed of the second guide roller 202 relatively slower than the delivery speed of the fiber bundle 103, a frictional force can be applied to the fiber bundle 103 on the second guide roller 202. Since the bundle 103 can be easily opened, the twisted portion 107 can be retained in front of the second guide roller 202. Further, by rotating the second guide roller 202 at a low speed, the friction of the contact portion can be reduced as compared with a fixed bar guide, and thus the fiber bundle 103 is not damaged or fluff is less likely to occur. .. Further, the fluff generated on the second guide roller 202 is easily carried to the fiber bundle 103 passing through the second guide roller 202, and is less likely to be accumulated on the second guide roller 202.

Further, it is preferable that the peripheral speed of the first guide roller 201 is the same as the feeding speed of the fiber bundle 103.

After the fiber bundle 103 sent out is brought into contact with the first guide roller 201 rotating at a peripheral speed equal to the delivery speed of the fiber bundle 103, at a peripheral speed relatively slower than the delivery speed of the fiber bundle 103. By making it contact with the rotating second guide roller 202, the tension applied to the fiber bundle 103 is disturbed as compared with the case where the guide roller rotating at a low speed with respect to the delivery speed of the fiber bundle 103 is contacted immediately. The fluctuation can be suppressed, and the decrease in the strength of the fiber bundle 103 can be suppressed. In particular, it is effective when the fiber bundle 103 is sent out at a high speed. Here, it is desirable that the feeding speed of the fiber bundle 103 and the constant speed are perfectly matched, but a speed difference of ±5% is acceptable.

The peripheral speed of the second guide roller 202 is preferably lower than the delivery speed of the fiber bundle 103, and more preferably 0.001 to 0.5 times the peripheral speed.

By rotating at a speed of 0.001 times or more, the twisted portion 107 can be retained in front of the second guide roller 202, and the generated fluff is easily carried to the fiber bundle 103, and It is difficult for fluff to collect on the guide roller 202. If it is less than 0.001 times, the friction between the second guide roller 202 and the fiber bundle 103 becomes large, and the fiber bundle 103 may be damaged. When it exceeds the delivery speed of the fiber bundle 103 over 0.5 times, the twisted portion 107 may not be retained in front of the second guide roller 202 and may be delivered as it is. It is preferably 0.002-0.2 times, more preferably 0.005-0.1 times.

Further, it is preferable that the delivery speed of the fiber bundle 103 is 30 to 100 m/min.

By setting the delivery speed to 30 m/min or more, the productivity can be increased and the production cost can be reduced. However, at a high speed, twisting due to the reversal of the fiber bundle 103 and turbulence or fluctuation of the tension applied to the fiber bundle 103 tend to occur easily, so it is preferably 100 m/min or less. The structure of the second guide roller 202 at a low speed, which is the structure of the present invention, the first guide roller rotating at a constant winding angle θ (207) and distance L (208), or at a constant peripheral speed. With the configuration including 201, the occurrence of twisting and the fluctuation of tension can be suppressed. Further, when the delivery eye 301 is used for molding a product having a complicated shape and the fiber bundle 103 in a wide range of 1 m or more is moved to the left and right, it is also effective for suppressing the tension fluctuation.

In addition, the guide roller group 200 further includes a third guide roller 203 downstream of the second guide roller 202, and the first guide roller 201 includes a sensing unit 210 that measures the tensile tension of the fiber bundle 103. However, it is preferable that the device configuration includes a control unit that controls the peripheral speed of the third guide roller 203 according to the fluctuation of the tensile tension.

As shown in FIG. 8, the tension measuring device 210 that senses the tension of the first guide roller 201 is provided, and the value from the tension measuring device 210 is analyzed by the control device 211. It is preferable to have a device configuration that sends a command signal to the guide roller rotation control device 212 to control the rotation speed of the third guide roller 203.

Thereby, the peripheral speed of the third guide roller 203 is controlled according to the fluctuation of the sensed tensile tension, and the frictional force between the fiber bundle 103 and the third guide roller 203 is changed, so that the fluctuation of the tension is alleviated. Can be made. Further, FIG. 9 shows a schematic diagram showing the fluctuation of the tension measured in the first guide roller 201. The abscissa indicates the elapsed time, and the ordinate indicates the tension from the tension measuring device 210 provided on the first guide roller 201. When the twisted portion 107 passes through the first guide roller 201 provided with the tension measuring device 210, the width of the fiber bundle 103 of the twisted portion 107 is small, and thus the frictional force with the first guide roller 201 is small. Therefore, the tension is temporarily reduced. 213 shows a state where the tension is lowered. When the tension decrease 213 is detected, a command is issued to the third guide roller 203 to decrease the rotation, and the frictional force is increased, so that the tension decrease 213 can be alleviated and stable conveyance of the fiber bundle 103 can be ensured. You can The dotted line 214 shows the state where the tension is relaxed. As for the state of tension relaxation due to the change in the rotation speed of the third guide roller 203 with respect to the tension fluctuation, the relationship is measured in advance, and the relationship value is stored in the control device 212 so as to be measured in accordance with the sensing measurement. The rotation speed of the third guide roller 203 can be set.

Further, it is preferable to adjust the peripheral speed of the third guide roller 203 with respect to the feeding speed of the fiber bundle 103 within a range of 0 to 1 times according to the fluctuation of the tensile tension.

By setting the relative peripheral velocity to be 1 time or less, the relative peripheral velocity of the third guide roller 203 is reduced with respect to the tension that is temporarily reduced, so that the frictional force can be increased and the tension reduction can be mitigated. .. If the relative peripheral speed exceeds 1, the slack of the fiber bundle may occur. If the relative peripheral speed is less than 0 times, that is, if the resin is rotated in the opposite direction, the load on the fiber tends to increase too much, and damage or the like may occur.

Further, the guide roller group 200 is shown to be composed of the first guide roller 201 and the second guide roller 202 located immediately downstream of the first guide roller, but the second guide roller 202 is shown. It is also preferable to arrange a plurality of the above.

As shown in FIG. 10, a second guide roller 202 that rotates in a direction opposite to the rotation direction of the first guide roller 201 is provided downstream of the first guide roller 201, and a rotation direction of the second guide roller 202 is provided downstream thereof. The second guide roller 204 that rotates in the opposite direction to the second guide roller 204 and the third guide roller 203 that rotates in the opposite direction to the rotation direction of the second guide roller 204 are arranged downstream thereof. Both guide rollers rotate in the same direction as the feeding direction 108 of the fiber bundle 103. By arranging a plurality of second guide rollers 202 and 204 whose peripheral speed is relatively slower than the delivery speed of the fiber bundle 103, not only the accuracy of retaining the twisted portion 107 of the fiber bundle 103 is improved, Also, there is an effect of suppressing the lateral movement of the fiber bundle 103 on the guide roller.

Further, between the bobbin 101 and the mandrel 302, a resin impregnation unit 400 for impregnating the fiber bundle 103 with the molten resin is further provided, and the guide roller group 200 is arranged between the bobbin 101 and the resin impregnation unit 400. Preferably.

In the fiber bundle sending unit 100, as shown in FIG. 2, when the fiber bundle 103 sent out from the bobbin 101 turns as shown by 106, the fiber bundle 103 is likely to be inverted and twisted. As shown, by disposing the guide roller group 200 between the bobbin 101 and the resin-impregnated portion 400, the twisted portion 107 of the fiber bundle 103 can be retained and the tension can be stabilized.

Further, between the bobbin 102 and the mandrel 302, a resin impregnation section 400 for impregnating the fiber bundle 103 with the molten resin is further provided, and the guide roller group 200 is arranged between the resin impregnation section 400 and the mandrel 302. Preferably.

In the fiber bundle winding section 300, since the fiber bundle 103 is wound around the liner 302, the delivery eye 301 is reciprocated left and right in the direction parallel to the axial direction of the liner 302. Therefore, the fiber bundle 103 is reversed in the process before this. And twisting easily occurs. Therefore, as shown in FIG. 12, by disposing the guide roller group 200 between the resin-impregnated portion 400 and the mandrel 302 on which the fiber bundle 103 is focused by the delivery eye 301, the twisted portion of the fiber bundle 103 107 can be retained, and tension can be stabilized.

Further, as shown in FIG. 13, a device configuration may be adopted in which a guide roller group 200A is arranged between the bobbin 101 and the resin impregnated portion 400, and a guide roller group 200B is arranged between the resin impregnated portion 400 and the mandrel 302. preferable.

As described above, by appropriately disposing the twisted portion 107 in the fiber bundle 103 at a place where the twisted portion 107 is likely to occur, the twisted portion 107 of the fiber bundle 103 can be retained at an appropriate place and the tension can be stabilized. ..

Next, a method for manufacturing the cylindrical body according to the present invention will be described.

A step of pulling out the fiber bundle 103 from the bobbin 101 around which the fiber bundle 103 in which a plurality of continuous fibers are bundled is wound, a step of conveying the fiber bundle 103 from the bobbin 101 and impregnating the fiber bundle 103 with resin, and a conveyed fiber bundle 103 And a step of winding the mandrel 302 around the mandrel 302 to form the tubular body, and the step of conveying the fiber bundle 103 includes at least a first guide roll 201 that first contacts the fiber bundle 103 and a first guide roll 201. Has a guide roller group 200 having at least a second guide roll 202 arranged on the downstream side of the guide roll 201, and the first guide roller 201 and the second guide roller 202 have different surfaces of the fiber bundle 103. The fiber bundle 103 is conveyed so as to come into contact with the fiber bundle 103 , the peripheral speed of the second guide roller is slower than the delivery speed of the fiber bundle, and the winding angle θ (207) (of the fiber bundle 103 in contact with the second guide roller 202 ( Is 30°≦θ≦170°, and
When 30°≦θ<70°, the formula (1) is satisfied, and when 70°≦θ≦170°, the formula (2) is satisfied.
180/sin(θ/2)≦L≦1500 (30°≦θ<70°) (1)
313≦L≦1500 (70°≦θ≦170°) (2)

Here, the distance L (208) (mm) is the distance between the center of the first guide roller 201 and the center of the second guide roller 202.

As shown in FIG. 11, first, the fiber bundle 103 is pulled out from the bobbin 101, and then tension is applied by the creel roller 102. Then, the fiber bundle 103 is sent out to the guide roll group 200. The guide roll group 200 is arranged so that the winding angle θ (207) and the distance L (208) shown in FIG. 5 satisfy the above relational expression. The sent out fiber bundle 103 is guided to the resin impregnation section 400 by the guide roll group 200, contacts the kiss roller 401, and impregnates the fiber bundle 103 with the resin. After that, the fiber bundle 103 is conveyed to the fiber bundle winding unit 300, the fiber bundle 103 is collected by the delivery eye 301, and is wound around the mandrel 302.

Further, as shown in FIG. 12, the guide roller group 200 is disposed between the resin impregnated portion 400 and the mandrel 302, and as shown in FIG. 13, the guide roller group 200 is disposed between the bobbin 101 and the resin impregnated portion 400. It is also preferable that the guide roller group 200B is arranged between the group 200A, the resin impregnated portion 400, and the mandrel 302.

Hereinafter, the integrated molded article of the present invention and the method for producing the same will be specifically described by way of examples, but the following examples do not limit the present invention.

(Examples 1 to 9)
A cylinder imitating the body of the pressure vessel was molded by the apparatus 1 for manufacturing a cylinder shown in FIG. 11 or 12. A CFRP having a predetermined width is cut into a ring shape from the formed cylinder, and the CFRP ring is set in a ring burst tester manufactured by Toray Industries, Inc., and the water pressure is increased from the inside of the ring at a pressure increasing rate of 1.4 MPa/s). The ring was broken by loading, and the pressure value at that time was recorded. The guide roller group 200 includes a first guide roller 201, a second guide roller 202, and a third guide roller 203. The first guide roller 201 and the third guide roller 203 correspond to the feeding speed of the fiber bundle 103. The second guide roller 202 was rotated at a constant peripheral speed, and the second guide roller 202 was rotated at the speed shown in (Table 1).

In Examples 1 to 5, as shown in FIG. 11, the guide roller group 200 was arranged immediately after the fiber bundle delivery section 100 including the bobbin 101 and the creel 102. Further, in Examples 6 to 9, as shown in FIG. 12, the guide roller group 200 was arranged in front of the fiber bundle winding section 300 including the delivery eye 301 and the liner 302. The fiber bundle feeding speed was 40 m/min, and the reinforcing fibers were carbon fibers T700SC-12K (filament number 12,000, specific gravity 1.8, fineness 0.8 g/m) and T700SC-24K (filament) manufactured by Toray Industries, Inc. A number of 24,000 and a fineness of 1.65 g/m) were used, and a general-purpose epoxy resin was used as the matrix resin.

(Example 10)
A sensing measurement function shown in FIG. 8 and a mechanism for controlling the peripheral speed of the third guide roller 203 were added, and other configurations were performed in the same manner as in Example 1.

(Comparative Examples 1 to 8)
For comparison, in the apparatus for manufacturing a tubular body shown in FIG. 1, the winding angle θ (207) of the fiber bundle 103 around the second guide roller 202, the center of the first guide roller 201, and the second guide roller 202. A pressure vessel was prepared by changing the distance L (208) from the center within the range shown in Table 1. Comparative Examples 1, 3, 5 and 7 were carried out using the tubular body manufacturing apparatus shown in FIG. 11, and Comparative Examples 2, 4, 6 and 8 were carried out using the tubular body manufacturing apparatus shown in FIG. Other conditions were the same as in Example 1. The results are shown in Table 1.

u: Relative peripheral speed of the second guide roller 202 with respect to the delivery speed of the fiber bundle 103: Angle of wrapping the fiber bundle 103 around the second guide roller 202 L: First guide roller 201 and second guide roller Evaluation of center-to-center distance with 202, ⊚: Excellent level without any problems in actual use, ◯: Good level without problems in actual use, ×: Problems with actual use Comparing the above results, the mechanism of the present invention is provided. In Examples 1 to 10, it was possible to prove that the twisted portion of the fiber bundle could be retained in front of the second guide roller, and as a result, the decrease in burst strength of the molded body could be suppressed. However, in the structure of the comparative example, it was difficult to hold the twisted portion of the fiber bundle in front of the second guide roller, and the fiber bundle was wound around the liner as it was, resulting in a decrease in burst strength of the molded body.

INDUSTRIAL APPLICABILITY The tubular body manufacturing apparatus and the manufacturing method thereof according to the present invention are suitable for a molding method such as a filament winding molding method or a pultrusion molding method in which continuous fibers impregnated with a resin are gathered and used. For example, it can be suitably used for a propeller shaft used in a pressure vessel for storing high-pressure gas therein and a propeller shaft that is mounted in a moving body such as a two-wheeled vehicle, an automobile having four or more wheels such as a bus and a passenger car, and the like. Moreover, the pressure vessel may be a stationary pressure vessel. Examples of the high pressure gas include hydrogen gas and compressed natural gas.

1 Overall Configuration of Manufacturing Device for Cylindrical Body 100 Fiber Bundle Delivery Unit 101 (1a to 1b) Bobbin 102 (2a to 2b) Creel Roller 103 (3a to 3b) Fiber Bundles 104, 105 Fiber Bundle Extraction Direction 106 Fiber Bundle Extracted Trajectory 107 of the fiber bundle at the time of reversing Fiber bundle 108 twisted by inversion Fiber bundle traveling direction 109, 110 Fiber spreading area 200 (200A to 200B) Guide roller group 201 (201a to 201b) First guide Roller 202 (202a to 202b) Second guide roller 203 (203a to 203b) Third guide roller 203, 204 Guide roller rotation direction 207 Fiber bundle winding angle θ
208 Center distance L between the first guide roller and the second guide roller
209 Direction of rotation of third guide roller 210 Tension sensing mechanism 211, 212 Tension control mechanism 213 Schematic diagram in which tension is reduced 214 Schematic diagram in which tension fluctuation is alleviated 300 Fiber bundle winding section 301 Delivery eye 302 Mandrel (liner)
400 Resin Impregnation Section 401 Kiss Roller 402 Resin Tank

Claims (9)

A device for manufacturing a cylindrical body, wherein the fiber bundle is wound from a bobbin wound with a fiber bundle obtained by bundling a plurality of continuous fibers, and wound around a mandrel,
Between the bobbin and the mandrel, a guide roll group that conveys the fiber bundle is provided,
The guide roll group has at least a first guide roll that first comes into contact with the fiber bundle, and a second guide roll that is arranged on the downstream side of the first guide roll,
The first guide roller and the second guide roller are arranged so as to contact different surfaces of the fiber bundle ,
The peripheral speed of the second guide roller is slower than the delivery speed of the fiber bundle,
When the winding angle θ (°) of the fiber bundle in contact with the second guide roller is 30°≦θ≦170° and 30°≦θ<70°, the formula (1) is satisfied and 70°≦ In the case of θ≦170°, the manufacturing apparatus for a cylinder, which satisfies the formula (2).
180/sin(θ/2)≦L≦1500 (30°≦θ<70°) (1)
313≦L≦1500 (70°≦θ≦170°) (2)
Here, L (mm) is the distance between the center of the first guide roller and the center of the second guide roller. The tubular body manufacturing apparatus according to claim 1, wherein the peripheral speed of the first guide roller is equal to the delivery speed of the fiber bundle. The apparatus for manufacturing a cylinder according to claim 1 , wherein the peripheral speed of the second guide roller is 0.001 to 0.5 times the speed at which the fiber bundle is delivered. Cylindrical body manufacturing apparatus according to any one of claims 1 to 3, delivery speed of the fiber bundle, characterized in that a 30 to 100 m / min. The guide roller group further includes a third guide roller downstream of the second guide roller,
The first guide roller is provided with a sensing means for measuring the tensile tension of the fiber bundle, and the first guide roller is provided with a control means for controlling the peripheral speed of the third guide roller according to the variation of the tensile tension. The manufacturing apparatus of the cylindrical body according to any one of claims 1 to 5 . Between the bobbin and the mandrel, the cylindrical body of the manufacturing apparatus according to any one of claims 1 to 5, further comprising a resin-impregnated portion impregnated with the molten resin to the fiber bundle. 7. The cylindrical body manufacturing apparatus according to claim 6 , wherein the guide roller group is arranged between the bobbin and the resin-impregnated portion. Cylindrical body manufacturing apparatus according to claim 6 or 7, wherein the placement of the guide roller group between the mandrel and the resin-impregnated portions. A step of pulling out the fiber bundle from a bobbin wound with a fiber bundle in which a plurality of continuous fibers are bundled;
A step of the fiber bundle to convey the causes resin impregnated prior Symbol fiber bundle from the bobbin,
A step of winding the conveyed fiber bundle around a mandrel,
A method of manufacturing a cylinder having at least:
The conveying step includes a guide roller group having at least a first guide roll that first comes into contact with the fiber bundle and a second guide roll that is arranged on the downstream side of the first guide roll,
The first guide roller and the second guide roller convey the fiber bundle so as to come into contact with different surfaces of the fiber bundle ,
The peripheral speed of the second guide roller is slower than the delivery speed of the fiber bundle,
When the winding angle θ (°) of the fiber bundle in contact with the second guide roller is 30°≦θ≦170° and 30°≦θ<70°, the formula (1) is satisfied and 70°≦ When θ≦170°, the method for manufacturing a cylindrical body is characterized by satisfying the expression (2).
180/sin(θ/2)≦L≦1500 (30°≦θ<70°) (1)
313≦L≦1500 (70°≦θ≦170°) (2)
Here, L (mm) is the distance between the center of the first guide roller and the center of the second guide roller.