JPH09207232A - Manufacture of non-circular fiber-reinforced plastic pipe and manufacturing device thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a method for manufacturing a non-circular FRP pipe which is designed for manufacturing a non-circular FRP pipe with an arbitrarily selected homogenous wall thickness by pressing a mixture of cut glass roving and a resin composition against the inner face of molding frame, then defoaming the mixture and repeatedly performing the constantly displaced rotation of the molding frame. SOLUTION: A non-circular fiber-reinforced plastic pipe is composed of glass roving 10 cut by a roller 4e with a cutting blade through the driving of a receiving roller 4d. The cutting length of the glass roving 10 can be changed by the interblade pitch of the roller with the cutting blade. On the other hand, a resin 8a and a curing agent 9a are supplied to a supply nozzle by a resin supply pump 8 and a curing agent supply pump 9a to manufacture a resin composition 11. This resin composition 11 is mixed with the cut glass roving 10a, and this mixture is scattered over the inner face of a hollow non-circular molding frame 1. The mixture of the supplied glass roving 10a and the resin composition 11 is defoamed by a defoaming roll which is rotated in contact with the inner face of the hollow non-circular molding frame after the defoaming roll is impregnated with the mixture.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-circular fiber reinforced plastic pipe (hereinafter, fiber reinforced plastic pipe is referred to as FRP).
(Referred to as a pipe) and its manufacturing apparatus.

[0002]

2. Description of the Related Art Conventionally, FW has been used as a method for molding FRP pipes.
Methods, centrifugal molding methods, hand lay-up methods, spray-up methods and the like are known. However, in the FW method, the strength difference between the axial direction and the circumferential direction of the obtained molded product is large, and it is necessary to grind the inner surface with a sander or the like in order to increase the bonding strength when the inner surface secondary bonding is performed. There is a problem, the centrifugal molding method requires molding at high speeds above the critical speed,
Further, there is a problem that it is impossible to change the axial wall thickness. Further, the centrifugal molding method has a drawback that it is difficult to manufacture a non-circular FRP pipe, and the hand layup method and the spray up method have a bad working environment, and work efficiency is low due to manual work.

Japanese Patent Publication No. 2-55221 proposes a molding apparatus which solves the above problems. This molding apparatus includes a hollow circular mold that moves while rotating, a device that cuts the glass roving and supplies it to the inner surface of the mold while being mixed with the resin composition, and is installed on the inner surface of the mold. It is a molding apparatus equipped with an impregnation defoaming device that rotates with rotation.

However, according to this molding apparatus, a hollow circular FRP pipe can be suitably molded, but in the case of a non-circular FRP pipe, the followability to the inner surface of the form of the impregnating roll is poor, There is a problem that impregnation and defoaming cannot be performed, and the peripheral speed due to the mold rotation of the mold inner surface at the place where the glass roving and the resin mixture are supplied is different due to the non-circular shape, and uniform wall thickness cannot be molded. is there.

[0005]

SUMMARY OF THE INVENTION The present invention is to solve the problems of the prior art as described above, and the invention of claim 1 is a non-circular FRP having an arbitrary uniform wall thickness.
A method of manufacturing a non-circular FRP pipe for molding a pipe is provided, and the inventions of claims 2 and 3 provide a molding apparatus used in the manufacturing method.

[0006]

DISCLOSURE OF THE INVENTION The present invention relates to a glass roving cut from the tip of a fixed beam installed on the floor while reciprocally moving a traverse trolley supporting a hollow non-circular formwork in the axial direction of the mold. A mixture of the resin composition is supplied to the inner surface of the mold, and the roller that rotates by contacting the inner surface of the mold as the mold moves moves the mixture of the cut glass roving and the resin composition to the mold. The present invention relates to a method for producing a non-circular FRP pipe, characterized in that the step of depressurizing by depressing the inner surface is repeatedly performed by rotating the mold with a constant displacement.

Further, according to the present invention, a hollow non-circular mold, a traverse trolley supporting the mold and traveling back and forth in the axial direction of the mold, a glass roving cut inside the mold and a resin composition are mixed. And a supply device for supplying and supplying the powder, and a roller that rotates in contact with the inner surface of the mold as the mold moves, depressing the cut mixture of the glass roving and the resin composition on the inner surface of the mold to defoam. The present invention relates to a non-circular FRP pipe manufacturing apparatus including a defoaming device, a fixed beam to which a supply device and a defoaming device are attached, and a mold rotation drive device that rotates the mold with a constant displacement. Furthermore, the present invention provides the above manufacturing apparatus,
The mold rotation driving device is provided with a contact roller that can rotate with the rotation of the hollow non-circular mold on the outer periphery of the hollow non-circular mold,
A non-circular FRP that detects the rotation of the contact roller with a rotary encoder and controls the prime mover that drives the supporting wheels that support the hollow non-circular formwork to control the displacement width of the hollow non-circular formwork. The present invention relates to a pipe manufacturing apparatus.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a partially cutaway front view showing an example of a non-circular FRP pipe manufacturing apparatus according to the present invention, and FIG. 2 is a right side view thereof.

In this molding apparatus, a hollow non-circular mold 1 is supported, the mold 1 is supported and mounted, and a traverse carriage 3 that reciprocates in the direction of the horizontal axis 2 of the mold 1 is cut inside the mold 1. Supply device 4 for mixing and supplying the glass roving and the resin composition, defoaming device 5, fixed beam 6 for mounting said supplying device 4 and defoaming device 5, and form rotation drive for rotating said form 1 at a constant displacement. It consists of a device 7. 8a is a resin, 8 is a resin supply pump, 9a is a curing agent, 9 is a curing agent supply pump, and 10 is glass roving.

The hollow non-circular mold 1 may have a structure in which it is fixed to the hollow circular mold 1a with a mounting plate 1b. The traverse truck 3 includes traveling wheels 3b that reciprocally travel on rails 3a installed on the floor, a drive device 3c that drives the traveling wheels 3b, and support wheels 3d that rotatably support and mount a hollow non-circular frame mold l. Can be configured as.
The resin 8a and the curing agent 9a are respectively supplied to the resin supply pump 8
And, by the curing agent supply pump 9, it is sent to the supply device 4 mounted on the fixed beam 6, and is supplied to the inner surface of the hollow non-circular mold 1 together with the glass roving 10.

FIG. 3 is a plan view of the supply device 4, and FIG. 4 is a side view thereof. The supply device 4 includes a resin supply pump 8, a curing agent supply pump 9, and a supply nozzle 4 (all of which are shown in FIG. 1).
a, a receiving roller 4d for cutting the glass lobing 10, a roller 4e with a cutting blade, and a binch roller 4f.
The glass roving 10 which is continuous long fiber is supplied between the receiving roller 4d and the pinch roller 4f, and the receiving roller 4
A glass raw pink 10a (called a glass chop) cut by the roller 4e with a cutting blade by driving d. The cutting length of the glass roving can be changed by the blade pitch of the roller 4e with a cutting blade. On the other hand, the resin 8a and the curing agent 9a are supplied by the resin supply pump 8 and the curing agent supply pump 9a (both shown in FIG. 1) to the supply nozzle 4a.
To be the resin composition 11, which has been cut and mixed with the lath lobing 10a, and is dispersed and supplied to the inner surface of the hollow non-circular mold 1 in a mixed state. Glass roving 10a and resin composition 1 supplied to the inner surface of hollow non-cylindrical mold l
The mixture No. 1 is impregnated and defoamed by the defoaming roll 5a which is brought into contact with the inner surface of the hollow non-cylindrical mold 1 and rotates.

FIG. 5 is a front view showing an example of the defoaming device 5, and FIG. 6 is a side view thereof. The defoaming device 5 includes a defoaming roll 5a that rotates in contact with the inner surface of the hollow non-circular mold 1, a supporting arm 5b that supports the defoaming roll 5a, and a cylinder 5c having one end attached to the middle of the supporting arm 5b. Can be configured. One ends of the support arm 5b and the cylinder 5c are attached to the support arm 6a fixed to the fixed beam 6. The respective constituent members are connected so as to be rotatable about axes X1 to X4 and axes Y1 to Y4.

The defoaming roll 5a is not particularly limited, but it is preferable that the defoaming roll 5a has a cylindrical shape and is provided with grooves in the circumferential direction of the surface to facilitate defoaming, and a brush-like brush or the like may be wound around the periphery. Further, a washer-shaped ring may be arranged side by side. The cylinder 5c presses the defoaming roll 5a against the inner surface of the hollow non-circular mold 1 and moves it up and down.
A pressure regulator such as an air cylinder or hydraulic pressure can be used for the cylinder 5c. The pressure of the pressure regulator is preferably set so that the defoaming roll 5a is on the inner surface of the hollow non-circular mold 1 about 50 to 400 g / cm with respect to the length of the defoaming roll.

The switching of the traverse carriage 3 in the traverse direction will be described. The detection devices 3f are installed at both ends of the traverse rail 3a as shown in FIG.
It functions to change the moving direction of the traverse carriage 3.
The detection device may be a commonly used limit switch, photocell, or the like.

A form rotation driving device 7 for rotating the hollow non-circular form 1 around the horizontal shaft 2 by a constant displacement will be described.
FIG. 7 shows a mold rotation driving device 7 of a non-circular FRP pipe manufacturing device.
8 is a front view of a part including FIG. 8, and FIG. 8 is a left side view (resin 8a, curing agent 9) of the manufacturing apparatus for the non-circular FRP pipe in FIG.
a, resin supply pump 8, hardener supply pump 9, fixed beam 6
The feeding device 4 and the glass roving 10 are omitted).

The mold rotation drive device 7 includes a drive prime mover 7a,
Contact roller 7 that rotates with the rotation of the hollow non-circular mold 1
b, a cylinder 7c that presses the contact roller 7b toward the rotation center o of the mold 1 so that the contact roller 7b always contacts the outer periphery of the hollow non-circular mold 1, an encoder 7d that detects the rotation of the contact roller 7b, and an encoder 7d. It is composed of a controller 7e for controlling the signal of. The hollow non-circular formwork 1 has a horizontal shaft 2
Is mounted on the support wheels 3d of the traverse carriage 3 and is rotated by the drive motor 7a. Drive prime mover 7a
Starts when it receives a signal from the detection device 3f when the traverse carriage 3 can move to the position of the detection device 3f. When the hollow non-circular mold 1 is rotated via the support wheels 3d by the action of the driving motor 7a, the contact roller 7a is rotated.
The encoder 7d detects the rotation of the contact roller 7b and outputs a signal from the encoder 7d when the contact roller 7b rotates by a constant displacement.
processing by e and sends a signal to the driving prime mover 7a
Stop working. In this way, the hollow non-circular mold 1 can be rotated by constant displacement. When the hollow non-circular mold 1 is rotated, the defoaming roll 5a is lifted by the action of the cylinder 5c.

The displacement width of the inner circumference of the inner surface of the hollow non-circular mold 1 caused by the constant displacement rotation of the hollow non-cylindrical mold 1 at the point where the glass roving and the resin composition are supplied by the supply device is hereinafter referred to as the feed width.

Next, the relationship between the moving speed of the traverse carriage, the capability of the glass roving and the resin composition feeder, and the feed width of the hollow non-circular mold will be described. If the amount of supply by the supply device 4 is constant and the moving speed of the traverse carriage 3 is constant, the thickness laminated by one movement is constant. The supply width of the mixture 11 of the glass roving 10a and the resin composition by the supply device 4 is generally 20 to 30 cm, and the central part is thick and the terminal part is thin, so that the mixture is laminated in a single circumferential direction. The laminated cross section is 20 to 30 cm wide, and the central part is thick and the peripheral part is thin. In order to make the thickness in the circumferential direction uniform, the hollow non-circular mold 1 is rotated by a constant displacement,
That is, by stacking with a feeding width and repeating this, the thickness in the circumferential direction is made uniform. As the feeding width is reduced, the thickness in the circumferential direction becomes more uniform, but the traverse carriage 3 needs to be moved faster in order to keep the molding thickness constant. When the supply width is adjusted to 20 to 30 cm, the feed width on the inner surface of the hollow non-circular mold is preferably 5 cm or less. When the feed width is set to 5 cm and the feed width is set to 20 to 30 cm, a predetermined laminated thickness can be obtained by traversing movements of 4 to 5 times, and molding with a uniform thickness as a whole is possible.
Further, it is possible to partially change the molding thickness by partially changing the rotational displacement of the hollow non-circular mold, that is, the feed width.

The molding time is governed by the supply capacity of the glass roving and the resin composition supply device used in the present invention. If the capacity is small, molding time will be required and the molding efficiency will decrease. Further, if the capacity is too large, it becomes necessary to extremely increase the moving speed of the traverse platform. A suitable supply capacity is about 2 to 15 kg / min.

In the present invention, a room temperature curable resin such as an unsaturated polyester resin is used as the resin composition. The resin composition contains a curing agent, and may contain a curing accelerator, a filler and the like as necessary. As the filler, organic or inorganic fillers such as calcium carbonate, talc, aluminum hydroxide, clay, glass balloon and milled fiber can be used depending on the required performance of the product.

Since the hollow non-cylindrical mold 1 is rotated by a constant displacement to perform repeated de-foaming while traversing the traverse carriage, stacking is repeated on the stacking part or the hollow non-circular formwork before the stacking part is cured. When it moves, the stack falls due to the weight of the stack, making molding impossible. In order to prevent this problem, it is desirable to adjust the curing time of the cured product so that the product is cured when the position of the laminated layer is rotated about 90 degrees to the right.

[0022]

The non-circular FRP pipe manufacturing method or its manufacturing apparatus according to the present invention is different from the conventional manufacturing method or apparatus in which the glass roving and the resin mixture are mixed and supplied to defoam while rotating the mold. While not rotating, the mixture of the glass roving and the resin composition is supplied to defoam while moving the mold in the axial direction of the mold, and then the mold is rotated by a constant displacement. The FRP can be laminated on the inner surface of the non-cylindrical mold by repeatedly supplying the mixture of the glass roving and the resin composition and defoaming by rotating the mold with constant displacement. Therefore, it is necessary to solve the problem of the followability of the defoaming roll into the non-circular mold caused by the conventional mold rotation, and the problem of wall thickness fluctuation caused by the difference in the peripheral speed of the inner surface of the non-circular mold. You can

After completion of molding, the molded product may be pulled out from the hollow non-circular mold, but the hollow non-circular mold 1a and the mounting plate 1b are sequentially removed to divide the hollow non-circular mold 1 or open it. It is preferable that the molded product is taken out and the molded product is taken out. For this reason, the hollow non-circular mold 1a, the mounting plate 1b, and the hollow non-circular mold 1 are separable or openable and separable or assembleable.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments.
Using the apparatus shown in FIG. 1, a non-circular FRP pipe was molded under the following conditions. As a result, it was possible to obtain a non-circular FRP tube having a thickness accuracy of 5 soil 1 mm and a glass content of 32% by weight and passing the Defense Agency FRP standard grade 5.

Molding conditions and results of non-circular FRP pipe (1) FRP pipe shape: cross-section long outer diameter (d1) 1680
mm, the short outer diameter (d2) of the cross section is 1210 mm, and is not an elliptical shape, but has an inflated and distorted shape, and the portion having the major diameter and the minor diameter is a short straight portion. (2) FRP tube length: 10 m (3) FRP tube outer circumference: 4720 mm (4) FRP tube thickness (specification): 5 mm (5) Material used: unsaturated polyester resin (PS-2188P
T, manufactured by Hitachi Chemical Co., Ltd.), curing agent (Permec N, trade name of NOF CORPORATION), glass roving (R2
310-06-54, manufactured by Nitto Boseki Co., Ltd. (6) Cutting length of glass roving: 38 mm (7) Material supply amount: glass roving 2.2 kg / min, resin composition 4.6 kg / min (resin composition Contains an unsaturated polyester resin and a curing agent (1% by weight of the curing agent).

(8) Material supply width: 250 mm (9) Traverse speed: 446 mm / sec (10) Feed width of hollow non-circular formwork: 35 mm (11) Outer diameter of defoaming roll (made of grooved polyethylene): 1
60 mm (12) Defoaming roll length: 300 mm (13) Defoaming roll pressing force: 150 g / cm (14) Molding result: Molding time 70 minutes (15) Molded FRP tube thickness: 4.8-5. 4 mm

[0027]

According to the method of the present invention, it is possible to mold a non-circular FRP pipe having a uniform wall thickness that cannot be molded by the conventional inner-roll molding method such as centrifugal molding method and rotational molding method. Further, the mold is rotated only once or twice in a single molding, and compared with the conventional molding method in which the mold is rotated while being molded, the manufacturing cost of the mold, the mold driving device, etc. can be significantly reduced. Can be planned. Furthermore, the number of steps is reduced by about 1/20 as compared with the manual work of the hand layup method. Further, the thickness of the FRP tube in the circumferential direction can be easily changed. The device according to claim 2 or 3 enables the above method to be carried out efficiently.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an example of a non-circular FRP pipe manufacturing apparatus according to the present invention.

FIG. 2 is a right side view of the manufacturing apparatus shown in FIG.

FIG. 3 is a plan view showing an example of a supply device 4.

FIG. 4 is a side view of the supply device 4 of FIG.

5 is a front view showing an example of a defoaming device 5. FIG.

FIG. 6 is a side view of the defoaming device 5 of FIG.

FIG. 7 is a front view of a part of the non-circular FRP pipe manufacturing apparatus of FIG.

8 is a left side view of the manufacturing apparatus for the non-circular FRP pipe in FIG. 1 (the resin 8a, the curing agent 9a, the resin supply pump 8, the curing agent supply pump 9, the fixed beam 6 supply device 4 and the glass roving 10 are omitted). is there.

[Explanation of symbols]

 1: Hollow non-circular formwork 1a: Hollow circular formwork 1b: Mounting plate 2: Horizontal shaft 3: Traverse carriage 3a: Rail 3b: Traveling wheel 3c: Drive device 3d: Supporting wheel 3f: Detection device 4: Supply device 4a: Supply nozzle 4d: Receiving roller 4e: Roller with cutting blade 4f: Pinch roller 5: Defoaming device 5a: Defoaming roll 5b: Support arm 5c: Cylinder 6: Fixed beam 6a: Support arm 7: Form rotation drive device 7a: Drive motor 7b: Contact roller 7c: Cylinder 7d: Rotary encoder 7e: Controller 8: Resin supply pump 8a: Resin 9: Curing agent supply pump 9a: Curing agent 10: Glass roving 10a: Glass chop 11: Resin composition

Claims (3)

[Claims] 1. A mixture of a glass roving and a resin composition cut from the tip of a fixed beam installed on the floor while a traverse carriage supporting a hollow non-circular mold is reciprocally moved in the axial direction of the mold. A roller that is supplied to the inner surface of the frame and rotates in contact with the inner surface of the mold with the movement of the mold suppresses the mixture of the cut glass roving and the resin composition on the inner surface of the mold to defoam. A process for producing a non-circular fiber-reinforced plastic pipe, characterized in that the steps are repeatedly performed by rotating the mold with constant displacement. 2. A hollow non-circular mold, a traverse carriage that supports and mounts the mold and travels back and forth in the axial direction of the mold, and glass roving cut inside the mold and a resin composition are mixed and supplied. Device, defoaming device for defoaming by suppressing the mixture of the cut glass roving and the resin composition on the inner surface of the mold with a roller that rotates in contact with the inner surface of the mold as the mold moves. An apparatus for producing a non-circular fiber-reinforced plastic pipe, comprising a fixed beam for mounting a supply device and a defoaming device, and a mold rotation drive device for rotating the mold with a constant displacement. 3. A mold rotation driving device is provided with a contact roller capable of rotating with the rotation of the hollow non-circular mold on the outer periphery of the hollow non-circular mold, and detecting the rotation of the contact roller by a rotary encoder, The apparatus for manufacturing a non-circular fiber-reinforced plastic pipe according to claim 2, wherein a prime mover that drives a supporting wheel that supports the non-circular mold is controlled to control a displacement width of the hollow non-circular mold. .