JP3268105B2 - Apparatus and method for producing FRP tubular body - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and a method for manufacturing an FRP (fiber reinforced plastic) tubular body, and more particularly to an apparatus and a method for manufacturing an FRP tubular body by a filament winding molding method.

[0002]

2. Description of the Related Art A so-called filament winding molding method is used in which a reinforcing fiber bundle is impregnated with a resin in a resin impregnating bath, and the resin-impregnated reinforcing fiber bundle is wound around a rotating mandrel at a predetermined angle. Manufacturing methods are known. In this molding method, usually, immediately before the mandrel, a feed roller for winding the resin-impregnated reinforcing fiber bundle at a predetermined angle at a predetermined position on the mandrel is provided. Since the winding angle of the reinforcing fiber bundle around the mandrel is variously changed, it is preferable that the feed roller also has a degree of freedom in angle.

[0003]

However, if the feed roller is simply provided with a degree of freedom in an angle within a certain plane, the following problem may occur. First, when the feed direction of the reinforcing fiber bundle and the rotation axis direction of the feed roller deviate greatly from each other, the reinforcing fiber bundle guided on the feed roller is moved to the feed roller shaft on the feed roller. Displaced in the direction along
The width of the reinforcing fiber bundle may vary. In particular, FIG.
As shown in FIG. 0, when the resin-impregnated reinforcing fiber bundle 102 is guided to the mandrel 103 by using a straight roll 101 with a flange as a feed roller, for example, an upward force F in the figure acts by tension, and the reinforcing fiber bundle 102 It is pushed to the end side of the feed roller 101 and comes into contact with the flange 101a. As a result, the width of the reinforcing fiber bundle 102 may fluctuate or the reinforcing fiber bundle 102 may be wound around the feed roller 101, which causes quality and production problems.

[0004] Further, since the reinforcing fiber bundle is wound around the mandrel in multiple layers, the winding diameter gradually increases. At this time, if the positional relationship of the feed roller with respect to the mandrel in the vertical direction is constant, the reinforcing fiber bundle sending position (height) from the feed roller and the winding position (height) around the mandrel as the winding diameter increases. Therefore, if the feed roller has only a degree of freedom in a certain plane, there is a possibility that the width of the reinforcing fiber bundle fluctuates as in the case described above.

An object of the present invention is to pay attention to the problems in the conventional filament winding molding method as described above, and to control both the angle and the position of the feed roller to an optimum range positively. An object of the present invention is to allow a mandrel to be stably wound at a predetermined angle without variation in width.

[0006]

In order to achieve the above object, an apparatus for manufacturing a tubular body made of FRP according to the present invention reciprocates a reinforcing fiber bundle impregnated with a resin on a mandrel in the direction of the rotation axis of the mandrel. In an apparatus for manufacturing an FRP tubular body by winding it through a moving feed roller, at least a direction (x-axis) approaching and separating from the mandrel and a direction (y-axis) along a rotation axis of the mandrel are provided on the feed roller. together impart a degree of freedom of the angles, remembering freedom position with respect to the vertical direction (z-axis), and,
The winding angle of the reinforcing fiber bundle with respect to the mandrel rotation axis
θ ₁ °, the angle of the rotation axis of the feed roller with respect to the x-axis
When the degree is θ ₂ ° and the allowable error of θ ₂ is Δθ ₂ ,
The feed roller is controlled so as to satisfy θ ₂ = θ ₁ ± Δθ ₂₀ 0 ° ≦ Δθ ₂ ≦ 15 ° .

Further, in the method of manufacturing an FRP tubular body according to the present invention, the reinforcing fiber bundle impregnated with a resin is wound around a mandrel via a feed roller that reciprocates in the rotation axis direction of the mandrel. In producing the tubular body, the feed roller has at least a degree of freedom in a direction approaching and separating from the mandrel (x-axis) and a direction along the rotation axis of the mandrel (y-axis), and a vertical direction (z-axis). ) With respect to the position of the reinforcing fiber bundle with respect to the rotation axis of the mandrel.
The winding angle is θ ₁ °, and the x-axis of the rotation axis of the feed roller
Angle theta ₂ ° with respect to the tolerance of theta ₂ and [Delta] [theta] ₂
At this time, the method is characterized in that the feed roller is controlled so as to satisfy θ ₂ = θ ₁ ± Δθ ₂₀ ° ≦ Δθ ₂ ≦ 15 ° .

By providing the feed roller with degrees of freedom with respect to the x-axis and the y-axis, the axial direction of the feed roller and the feed direction of the reinforcing fiber bundle sent on the feed roller are controlled so as to be orthogonal or close to each other. It is possible to be. At the same time, by giving the degree of freedom in the vertical direction (z axis), even when the winding diameter of the reinforcing fiber bundle increases on the mandrel, the height of the feed roller and the height of the winding position on the mandrel are increased. Can be maintained in a certain relationship.

By controlling the angle of the feed roller with respect to the x-axis and the y-axis to an optimum range, a force for pushing the reinforcing fiber bundle on the feed roller in one of the directions along the axis of the feed roller acts. Or the force can be prevented from becoming excessive. In addition, by controlling the position (height) in the z-axis direction to an optimum range, the height relation between the feed roller and the mandrel is always maintained in a stable optimum relation during filament winding. As a result, it is possible to prevent the width variation of the reinforcing fiber bundle, and it is possible to always wind the reinforcing fiber bundle around the mandrel with a stable width and a predetermined angle.

In order to actively control such a state,
, In the present invention, the angle of the feed roller, the position of the z-axis direction, Ru are each controlled as follows. Regarding the angle of the feed roller, the winding angle of the reinforcing fiber bundle with respect to the mandrel rotation axis was θ ₁ °, the angle of the rotation axis of the feed roller with respect to the x axis was θ ₂ °, and the allowable error of θ ₂ was Δθ ₂ . when the feed _{roller, θ 2 = θ 1 ± Δθ} 2 0 ° ≦ Δθ 2 ≦ 15 ° that are controlled so as to satisfy.

It is preferable that the position of the feed roller is controlled so that the reinforcing fiber bundle sent from the feed roller to the mandrel always extends substantially in the horizontal direction.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the method for manufacturing an FRP tubular body according to the present invention will be described below with reference to the drawings. FIG.
FIG. 4 to FIG. 4 show an apparatus for manufacturing an FRP tubular body according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a creel stand on which a number of bobbins 2 wound with reinforcing fiber yarns (for example, carbon fiber yarns) are installed. The reinforcing fiber yarns 3 drawn out from the respective bobbins 2 of the creel stand 1 are drawn into a predetermined number to form a reinforcing fiber bundle 4, which is sent to a separate roll 5. The reinforcing fibers are not limited to carbon fibers, and may be, for example, glass fibers, aramid fibers, or the like, and may be used in combination.

In the present embodiment, the separate roll 5 comprises a pair of free rotating rolls 6a extending substantially horizontally.
6b, and a pair of free rotating rolls 7a, 7b, which extend substantially vertically in the downstream side. The reinforcing fiber bundles 4 having a substantially predetermined cross-sectional shape by the separate rolls 5 are introduced into a resin impregnation bath 9 via guide rolls 8 composed of free-rotating rollers.

An uncured resin 10 serving as a matrix resin of the FRP tubular body is accommodated in the resin impregnation bath 9. As the matrix resin, a thermosetting resin such as an epoxy resin, a phenol resin, a polyimide resin, a vinyl ester resin, and an unsaturated polyester resin is used, but other resins, for example, thermoplastic resins such as polyamide, polycarbonate, and polyetherimide are used. It may be resin.

In this embodiment, a roller 11 that is driven to rotate or is free to rotate is provided in a resin impregnated bath 9.
a, 11b, and 11c are provided. Reinforced fiber bundle 4
Are sequentially guided on the rotating rollers 11 a, 11 b and 11 c, and the reinforcing fiber bundle 4 is impregnated with the resin 10 in the bus 9.

The reinforcing fiber bundle impregnated with the resin 10, that is, the resin-impregnated reinforcing fiber bundle 12, is guided to the feed roller 14 by the guide means 13. The guide means 13
In the present embodiment, three guides 13a, 13b and 13c are provided, and the resin-impregnated reinforcing fiber bundle 12 is guided on these guides 13a, 13b and 13c in order.

Of the plurality of guides 13a, 13b, 13c, in this embodiment, two guides 13a, 13
b is configured as a rotatable roller, and the guide 13c on the downstream side (mandrel side) is configured as a fixed guide.
However, the guides 13a and 13b may also be configured as fixed guides.

Pads 15a and 15b made of, for example, rubber are provided on the rollers 13a and 13b, and the pads 15a and 15b are pressed with an appropriate pressing force.
13b. These rollers 13a, 13b
Of the resin-impregnated reinforcing fiber bundle 12 passing between the surface and the pads 15a and 15b to squeeze out excess resin. However, the rollers 13a, 13b
The pad 15a, 15b is not always necessary when the excess resin can be sufficiently squeezed out by only the above.

The surface of the fixed guide 13c is preferably subjected to a treatment for reducing the coefficient of friction so that the resin-impregnated reinforcing fiber bundle 12 passing therethrough is less likely to stick and fluff is less likely to occur. . As the low friction coefficient treatment, matte chrome plating, fluororesin coating or coating,
Ceramic spraying and the like can be mentioned.

The resin-impregnated reinforcing fiber bundle 12 from the guide means 13 is guided to a feed roller 14. In the present embodiment, the feed roller 14 is used for the resin-impregnated reinforcing fiber bundle 12.
And a pair of rollers 14a and 14b arranged in the feeding direction. The pair of rollers 14a and 14b are rotatably supported by the bracket 16,
Is a cylinder 18 rotatably supported in a support 22.
Fixed on top. After the resin-impregnated reinforcing fiber bundle 12 is inserted through the hollow portion 18a of the cylinder 18, the resin-impregnated reinforcing fiber bundle 12 is sent onto the mandrel 19 via a pair of feed rollers 14a and 14b. Feed roller 14a,
14b is moved along the rotation axis 19a of the mandrel 19 together with the cylinder 18 and the carriage stand 17.

The support 22 is supported by the moving body 23 so as to be rotatable in a horizontal plane. The moving body 23 is supported by the carriage stand 17 so as to be movable in the vertical direction.

Therefore, in this embodiment, the feed roller 14 is rotatable in a plane including the z-axis (FIG. 2) extending in the vertical direction via the bracket 16 and the cylinder 18 (the direction of arrow P). Through the support 22,
It is rotatable around the z-axis (arrow Q direction), and is further movable in the direction along the z-axis, ie, up and down (arrow R direction), through vertical movement of the support 23.

In the above description, the feed roller 14
Can rotate about the z-axis, so that the feed roller 14 is provided with a degree of freedom for angles in substantially all directions. In the present invention, at least the direction (x Axis: FIGS. 2, 3 and 4) and a degree of freedom with respect to the direction (y-axis: FIGS. 2 and 3) along the rotation axis 19a of the mandrel 19, that is, a plane including the x-axis and the y-axis. It is necessary that the degree of freedom be given within and that the degree of freedom be given with respect to the z-axis direction. More degrees of freedom are given as needed.

The mandrel 19 is driven to rotate at a predetermined rotation speed by a mandrel rotation driving means 20. The mandrel rotation driving means 20 is composed of, for example, a motor or a combination of a motor and a speed reducer. By winding a predetermined number of layers at a predetermined angle on the mandrel 19, a resin-uncured FRP tubular body 21 is formed,
By curing the resin, a molded product of the FRP tubular body 21 is obtained.

In the embodiment apparatus constructed as described above, a plurality of reinforcing fiber yarns 1 sent from the creel stand 1 are aligned to form a reinforcing fiber bundle 4. After passing through the separate roll 5, the reinforcing fiber bundle 4 is introduced into the resin impregnated bath 9 via the guide roll 8. In the resin impregnation bath 9, the reinforcing fiber bundle 4 is impregnated with the resin 10 while being guided on the rollers 11a, 11b, 11c.

The reinforcing fiber bundle 12 impregnated with the resin 10 is
Guides 13a, 13b, and 13c are sequentially guided,
Since the guide 13c is a fixed guide, the excess resin is squeezed out at this portion and excess resin is squeezed out. Further, since the guides 13a and 13b are provided with the pads 15a and 15b, excess resin can be squeezed out more efficiently.
The squeezed resin is returned to the resin impregnation bath 9 below.

The resin impregnated reinforcing fiber bundle 12 includes a cylinder 1
Feed rollers 14a, 14 through the hollow portion 18a
b, from which it is wound onto the mandrel 19.

Feed rollers 14a, 14 at the time of winding
The angle and position of b are controlled, for example, as shown in FIGS. That is, the feed rollers 14a, 14
The angle θ ₂ ° of b with respect to the x-axis is, with respect to the target winding angle θ ₁ ° of the reinforcing fiber bundle 12 (the angle with respect to the y-axis),
The control is performed so as to satisfy θ ₂ = θ ₁ ± Δθ ₂ , 0 ° ≦ Δθ ₂ ≦ 15 °. When Δθ ₂ = 0 °, that is, θ ₂ =
When theta _1, a force to move the feed roller 14a, the reinforcing fiber bundle 12 on the 14b in a direction along the axis of the feed roller does not work, its width is stabilized width W of the reinforcing fiber bundle 12 becomes the maximum. Further, by to have a slight angle in the range of the Δθ ₂ 0 ° ~15 °, to impart a small constant force reinforcing fiber bundle 12 in a direction along the axis of the feed roller,
The width W of the reinforcing fiber bundle 12 can be stabilized with the width while being slightly reduced. At this time, since Δθ ₂ is small, the reinforcing fiber bundle 12 does not move to the end of the feed roller. By controlling such an angle, the reinforcing fiber bundle 12
Is always kept at a stable and constant width.

As shown in FIG. 4, the control in the z-axis direction (vertical direction) is performed so that the reinforcing fiber bundle 12 extending from the feed roller 14b to the winding position on the mandrel 19 becomes horizontal. Height is controlled. By controlling such a position, the feed roller 14
The reinforcing fiber bundles on a and 14b are not twisted, rubbed, etc., and are always kept in a stable optimum feeding state.

In the above embodiment, straight rollers are used for the feed rollers 14a and 14b.
As shown in FIG. 5, a roll having a roll-shaped drum surface may be used. In particular, it is preferable to use a drum-shaped roll for the mandrel 19, that is, for the feed roller 14b.

The radius of curvature R of the roll surface of the hourglass feed roller 14b is desirably set in the range of 200 to 500 mm, more preferably in the range of 300 to 400 mm.

The resin-impregnated reinforcing fiber bundle 12 can move freely on the feed roller 14b in the direction of AA in FIG. 5 in a tensionless state, but the tension accompanying the winding on the mandrel 19 is actually increased. Since it has occurred, it is brought to the center in the roller axial direction (AA direction) along the R shape of the hourglass roller surface. This force acts constantly and naturally during filament winding.

By the action of this force, the resin-impregnated reinforcing fiber bundle 12 always passes through the central portion in the roller axial direction on the feed roller 14b, and moves to the roller end even if there is some fluctuation. Never. Therefore,
Even if there is no flange at the end of the roller, the resin-impregnated reinforcing fiber bundle 12 does not fall off the roller 14b. Because there is no collar, the resin-impregnated reinforcing fiber bundle 12 does not hit the collar,
There is no accompanying fluctuation in the width of the reinforcing fiber bundle 12. Further, as described above, since the excess resin is squeezed out of the resin-impregnated reinforcing fiber bundle 12 and there is no fluctuation due to contact with the flange, the feed roller 14b
Winding around is extremely unlikely to occur.

In the filament winding method as described above, if the rotation direction of the mandrel 19 is constant, the FRP tubular body 2 formed on the mandrel 19
In FIG. 1, a crossing portion 25 of the reinforcing fiber bundle 12 (hereinafter, referred to as a “hook portion” in this specification) always occurs as shown in FIG. The hook 25 is provided with the reinforcing fiber bundle 12 to be wound.
, The winding angle, the initial winding position on the mandrel 19, and the like, determine the generated longitudinal position. Therefore, by forcibly changing at least one of these conditions, the hook portion is uniformly dispersed in the longitudinal direction of the FRP tubular body 21, and substantially the same state as when the hook portion is not formed. It can be molded into

As described above, in the present invention, the feed rollers 14a and 14b are provided with degrees of freedom in terms of angle and position. By controlling the feed rollers 14a and 14b to change them appropriately, the position at which the hook portion is formed can be adjusted to FRP. It is uniformly dispersed in the longitudinal direction of the tubular body 21. Since the hook portion is a portion that is likely to be structurally defective, the static strength and fatigue strength of the FRP tubular body 21 can be particularly improved by uniformly dispersing in this manner.

In the above-described filament winding molding, when the resin-impregnated reinforcing fiber bundle 12 is wound around the mandrel 19, it is preferable to lower the temperature of the resin to increase its viscosity. If the viscosity of the resin is low, it is difficult to extrude entrained voids (bubbles), but by increasing the viscosity and applying pressure in the radial direction, the voids can be easily discharged to the outside, and the quality is improved.

That is, the thermosetting resin, when uncured, generally has the characteristics shown in FIG.
When the resin is cured for molding, the temperature is increased to increase the viscosity as shown by an arrow B, but in the above, the temperature is once lowered as shown by an arrow C for void discharge,
Increase the viscosity. In order to lower the temperature, cold air may be blown onto the resin-impregnated reinforcing fiber bundle 12 immediately before winding on the mandrel. In addition, cooling by water injection is also possible.

In the filament winding molding method, the resin-impregnated reinforcing fiber bundle 12 is wound on a mandrel 19 having a predetermined diameter, so that the formed FRP tubular body 21 is molded according to the inner diameter rule. In practice, the FRP tubular body 21 is often required so that the finished diameter of the outer diameter becomes a predetermined diameter. To achieve this, a method as shown in FIG.

That is, on the outer surface of the uncured FRP tubular body 21 formed on the mandrel 19, a combination roller composed of a plurality of rollers 30 (three in the illustrated example) is attached to the FRP tubular body 21. The FRP tubular body 21 is run in a direction along the rotation axis while being pressed radially on the surface of the FRP tubular body 21. At this time, since the mandrel 19 and the FRP tubular body 21 are rotating in the direction of the arrow, in the circumferential direction of the FRP tubular body 21, between the outer surface of the FRP tubular body 21 and the surface of each roller 30. Slips. Each roller 30 has an arc surface corresponding to a target forming outer diameter (a target finishing diameter) of the FRP tubular body 21 when viewed in a cross section including its own rotation axis.

By pressing the combination roller 30 in this manner, the resin of the uncured FRP tubular body 21 is squeezed, and by adjusting the pressing force and the number of times of running on the surface of the FRP tubular body 21, the outer diameter is reduced. The molding in accordance with the law becomes possible, and a target outer diameter finish dimension can be accurately obtained. In addition, the pressing of the roller 30 discharges the entrapped voids, and the strength of the molded FRP tubular body 21 is improved, thereby improving the quality.

The surface finish of the roller 30 may be either a mirror finish or a satin finish, but a satin finish is more preferable because cut yarns and the like are less likely to be transferred to the roller surface.

Further, as shown in FIG. 9, a ring 40 having an inner diameter corresponding to the target finish diameter of the tubular body 21 made of FRP.
Can be run integrally with the carriage stand 17, for example. The resin-impregnated reinforcing fiber bundle 12 is wound around the mandrel 19 while maintaining a predetermined angle with the ring 40. Resin impregnated reinforced fiber bundle 12
Is wound while the resin is squeezed by the ring 40, and the entrainment of air is suppressed. Also,
When the outer diameter of the uncured FRP tubular body 21 being formed becomes close to the target diameter, even if a part that exceeds the target diameter occurs partially, the part is squeezed by the ring 40 and accommodated in the target diameter. Therefore, the outer diameter rule can be finally formed, and a target finish diameter can be accurately obtained.

[0043]

As described above, according to the present invention, the feed roller for guiding the resin-impregnated reinforced fiber bundle to the mandrel has at least the degree of freedom in the angles about the x-axis and the y-axis. Give the position flexibility and increase the angle of the feed roller with respect to the x-axis.
Control within a specific range in relation to the wrapping angle of the activated fiber bundle
Since the way, without causing winding of the width change and roller reinforcing fiber bundle, it can be wound at an angle to the target stably and mandrel, and reinforcing fibers
The width of the bundle can be stabilized, so that the production can be stabilized and the quality of the formed FRP tubular body can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for manufacturing an FRP tubular body according to one embodiment of the present invention.

FIG. 2 is a partially enlarged schematic front view showing the vicinity of a feed roller and a mandrel of the apparatus shown in FIG.

FIG. 3 is a plan view of a feed roller and a mandrel portion of the apparatus of FIG.

FIG. 4 is a longitudinal sectional view taken along the line IV-IV in FIG. 3;

FIG. 5 is a partial front view near a feed roller and a mandrel according to a modified example of the apparatus in FIG. 1;

FIG. 6 is a partial plan view showing a finished state of an FRP tubular body.

FIG. 7 is a diagram illustrating the relationship between temperature and viscosity of a thermosetting resin in an uncured state.

FIG. 8 is a schematic longitudinal sectional view showing a preferred method of forming a tubular body made of FRP on a mandrel.

FIG. 9 is a partial schematic perspective view showing another preferred method for forming a tubular body made of FRP on a mandrel.

FIG. 10 is a partial schematic front view showing a state of molding by a conventional flanged feed roller.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 creel stand 2 bobbin 3 reinforcing fiber yarn 4 reinforcing fiber bundle (before resin impregnation) 5, 6a, 6b, 7a, 7b separate roll 8 guide roll 9 resin impregnation bath 10 resin 11a, 11b, 11c roller 12 resin impregnated reinforced fiber bundle 13 Guide means 13a, 13b, 13c Guide 14, 14a, 14b Feed roller 15a, 15b Pad 16 Bracket 17 Carriage stand 18 Cylinder 18a Hollow part 19 Mandrel 19a Mandrel rotation axis 20 Rotation driving means 21 FRP tubular body 30 Roller 40 Ring

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-4-294130 (JP, A) JP-A-58-71127 (JP, A) JP-A-7-16937 (JP, A) JP-A-1- 168434 (JP, A) JP-A-1-247145 (JP, A) JP-A-1-200941 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B29C 70/00-70 / 88

Claims (4)

(57) [Claims] 1. An apparatus for manufacturing an FRP tubular body by winding a reinforcing fiber bundle impregnated with a resin around a mandrel via a feed roller that reciprocates in the rotation axis direction of the mandrel. at least,
A degree of freedom is provided in a direction approaching and separating from the mandrel (x-axis) and a direction along the rotation axis of the mandrel (y-axis) , and a degree of freedom in position is provided in a vertical direction (z-axis) , and the reinforcement is provided. Fiber bundle mandrel times
The winding angle to the rotation axis is θ ₁ °, and the feed roller
The angle of the rotation axis with respect to the x axis is θ ₂ °, and the tolerance of θ ₂ is
When the [Delta] [theta] _2, the feed rollers, characterized in being controlled that to satisfy _{θ 2 = θ 1 ± Δθ 2} 0 ° ≦ Δθ 2 ≦ 15 °, FRP
Equipment for manufacturing tubular body. 2. The position of the feed roller in the z-axis direction.
Is reinforced fiber sent from the feed roller to the mandrel.
The vascular bundle is always controlled to extend substantially horizontally
The apparatus for manufacturing an FRP tubular body according to claim 1. 3. A reinforcing fiber bundle impregnated with a resin is mandated.
A reciprocating shaft in the direction of the rotation axis of the mandrel.
To form an FRP tubular body
The feed roller at least with a mandrel
Direction of approaching / leaving (x axis) and rotation of mandrel
Gives a degree of freedom in the direction along the axis (y-axis)
In addition, the degree of freedom of position in the vertical direction (z axis)
With respect to the mandrel rotation axis of the reinforcing fiber bundle.
The winding angle θ ₁ °, x of the rotation axis of the feed roller
An angle relative to the axis theta ₂ °, to the tolerance of theta ₂ and [Delta] [theta] ₂
Wherein the feed roller is controlled so as to satisfy θ ₂ = θ ₁ ± Δθ ₂₀ 0 ° ≦ Δθ ₂ ≦ 15 ° .
A method for producing a tubular body. 4. The position of the feed roller in the z-axis direction.
Reinforced fiber sent from the feed roller to the mandrel
Control the vascular bundle to always extend substantially horizontally,
A method for producing an FRP tubular body according to claim 3 .