JPS5914328B2 - Manufacturing method of FRP pipe with ribs - Google Patents

Description

[Detailed Description of the Invention] 5 This invention provides a so-called fiber-reinforced plastic having ribs (
The present invention relates to a method of manufacturing a pipe made of FRP.

One of the conventional manufacturing methods for FRP pipes is the centrifugal molding method, which involves injecting or injecting a synthetic resin liquid mixed with a catalyst and curing accelerator together with reinforcing fibers into a cylindrical mold 10 that rotates at high speed. However, in this type of manufacturing method, the cylindrical mold rotates at high speed, so the reinforcing fibers are generally aligned in the circumferential direction perpendicular to the central axis of the cylindrical mold. 15 No strength in the central axis direction,
In addition, during manufacturing, the synthetic resin liquid solidifies before it is injected into the cylindrical mold, and the injection method scatters outside the cylindrical mold, resulting in poor material yield. Since the material is attached to the inner surface of the cylindrical mold, the light resin is on the inside and the heavy fibers are on the outside, and the fibers and resin are separated, resulting in poor strength. The attached material had the disadvantage that it spread to a uniform thickness, making it impossible to make the part as thick as the ribs.

An object of the present invention is to provide a method for manufacturing an FRP pipe having ribs, which eliminates the above-mentioned drawbacks. Before explaining the method for manufacturing an FRP pipe according to the present invention, the structure of the device used to carry out this method will be explained.As shown in FIG. A plurality of rollers 5, 5 driven by a motor 4 are placed on a trolley H. A cantilevered beam B is rotatably supported by the cylindrical mold A and horizontally protrudes from the support frame 6 in the direction of the central axis 150-0 of the cylindrical mold A. A reciprocating sliding body C that reciprocates on the top is provided, and the reciprocating sliding body C, as shown in FIG. A roller device F for mixing fiber binder is provided.

To explain the configuration of each of the above-mentioned devices D, E and F in more detail, the reinforcing short fiber supply device D is shown in Figs. 3 and 4. A plurality of reinforcing fibers, such as glass fibers, are introduced into the cylindrical mold A from outside the end of the cylindrical mold A through a roping guide 10 (see FIG. 5) suspended from the wire 8 via a pulley 9. A vertical cylindrical body 13 is provided with a receiving port 12 (see FIGS. 2 and 6) at the top for receiving the roping 11, and a rubber roll 14 and a shearing blade roll 16 having radial shearing blades 15 are provided next to the receiving port. A shearing section 17 for shearing the reinforcing fibers into short fibers is provided in the vertical cylinder 13, and the cylinder 13 has an inner surface 1 of the cylindrical mold A.
8, and a fall port 19 for the short fibers is opened at the lower end.

A reinforcing fiber binding agent discharging device E. A fine hole 22 (see FIG. Nozzle 20, 2 with many holes (see)
1 (see FIG. 6), and conduits 23 and 24 passing through the nozzles 20 and 21 are provided in the lower frame d of the reciprocating sliding body C. Introductory pipes 23 and 24 are hung on the sides with hanging devices that move on ivy wires.
(see Figure 10), a reinforcing fiber binder, such as a mixture of an unsaturated polyester resin and a catalyst, is supplied to the conduit 23, and a mixture of an unsaturated polyester resin and a curing accelerator is supplied to the conduit 23. so that it is supplied to conduit 24.

A vertical nozzle 20 supplies a linear mixture of unsaturated polyester resin and a catalyst, and a nozzle 21 supplies a linear mixture of an unsaturated polyester resin and a curing accelerator to the cylindrical mold. It will be discharged onto the inner surface 18 of A. Note that in the devices shown in Figures 2 and 6, the resin containing the catalyst and the resin containing the curing accelerator were guided through separate conduits, but these two types of resin were introduced into one conduit through one conduit. The liquid may be introduced into a nozzle 20 (see FIG. 14) and discharged from one nozzle. However, in this case, it is necessary to mix the above two types of resins as close to the nozzle as possible. The nozzles 20 and 21 are divided into at least three parts, ie, both ends of the nozzle and other parts, over the entire length of the nozzle, and a shielding plate 25 (the eighth (see figure), and the shielding plate 25
A gear sector part 25/ is provided on the outer periphery of the nozzle, and is engaged with racks 27 provided on both sides of a piston rod 27 of a fluid drive cylinder 26 whose one end is pivotally supported on a part of the reciprocating slider, thereby rotating the outer periphery of the nozzle when necessary. The pore 22 at the bottom of the nozzle can be opened and closed by moving the nozzle.

Note that the cover plate 25 may be provided by further dividing the portions other than both ends of the nozzles 20 and 21 into a plurality of pieces. Roller device F for mixing reinforcing fibers and reinforcing fiber binding agent F said reciprocating sliding body C
A pair of substantially fan-shaped frame plates 28, 28' centered on the central axis 0-0 of the cylindrical mold A are provided at the bottom of the cylindrical mold A (see FIG. 6),
A pair of fluid drive cylinders 30, 31 are attached to flanges 29, 29' (see FIG. 7) at the lower edges of the fan-shaped frame plates 28, 28', which are formed in a direction perpendicular to the central axis 0-0. A drive cylinder 3 is disposed within the radial surface 32, 32'' including the central axis 0-o.
The piston rods 33 and 34 of each drive cylinder 30 and 31 are arranged in several pairs (six pairs in the embodiment) at a substantially constant pitch P so that the center line 01-01 of the roller 35 is located at the center line 01-01 of the drive cylinder 30, 31. 38, a chain wheel 39 is fixed to each roller shaft 38, and a main drive chain wheel 40 rotatably provided on these chain wheels 39 and the reciprocating sliding body C, and the sliding body Idle chain wheels 41, 42 rotatably provided at the bottom of C
The driving chain wheel 40 rotates together with a shaft 44, but is provided so as to be able to slide on the shaft 44, and the shaft 44 extends along the beam B. (See FIG. 11) It is connected by a helical gear train 48 to an intermediate shaft 47 that is rotated via a belt 46 by a motor 45 (see FIG. 11) provided in the beam support frame 6 at the base of the beam B.

Note that grooves are cut on the circumferential surface of the roller 35 in the direction of the generatrix, in a spiral shape, or in the shape of a basic pattern. 49 in Figure 6 is the roller 35
The guide rod is shown for the radial movement of. Next, the relationship between the beam body B and the reciprocating sliding body C will be explained in more detail.
As shown in FIGS. 6 and 7, guide rails 51 and 52 are provided on the upper surface 50 of the beam B, guide rails 54 and 55 and a lead screw 63 are provided on the lower surface 53, and The shear blade roll 16 of the short fiber supply device D is connected to a chain 64.
A drive shaft 65 for rotation by the chain wheel 64 via the drive shaft 44 for the already described chain wheel 40 is provided. The reciprocating sliding body C has a hollow upper part made of a housing frame, and includes a trochanter 56 that engages with the guide rails 51, 52 and 54, 55 in a direction perpendicular to the longitudinal direction of the beam body B.
It has trochanter shafts 60, 61 having trochanter shafts 57, 58, 59, respectively, and a mother thread body 66 which is threadedly engaged with the lead screw 63,
As shown in FIGS. 11 and 12, the lead screw 63 is
Similarly, a motor 67 separately provided in the support casing frame 6 rotates forward and backward through a chain wheel 68 and a chain 69, thereby making it possible to reciprocate and slide on the beam body B.
In this device, the rollers 5, 5 on the cart H are rotated by the independent motor 4, but since the rotation of the roller 35 and the cylindrical mold A must be synchronized, the roller 35 is rotated by the independent motor 4.
Of course, all of the rollers 55 may be rotated by the motor 45 of the support casing frame 6 via a transmission device.

Since this device has the configuration as described above, first the trolley H
The upper roller 5 is rotated by operating the motor 4, and the cylindrical mold A is rotated at a circumferential speed of approximately 1 to 4 r, P, m and 5 to 10 m/M.
Rotate at low speed at about 1.5 in. Then, when the motor 67 of the beam body support frame 6 is operated, the lead screw 63 starts to rotate, so the reciprocating sliding body C, which is engaged with the lead screw at the base screw body 66, is guided on the beam body B to the guide rails 51 and 52. and start moving. Therefore, the reciprocating sliding body C moves leaving a spiral trajectory on the inner surface of the cylindrical mold A, and when it approaches one of the small ends of the cylindrical mold A, the motor 67 is turned off using a limit switch or the like. If the rotation is reversed, the reciprocating sliding body C will return on the beam body B, and if it approaches the other end of the cylindrical mold A, the rotation of the motor 67 can be stopped using another limit switch or the like. When rotated in the normal direction, the reciprocating sliding body C can repeat reciprocating motion on the beam B within the cylindrical mold A in the direction of the central axis 0-0. Therefore, when the reciprocating sliding body C is moved on the beam body B and the motor 45 of the support housing frame 6 is rotated, the drive shafts 44 and 65 on both sides of the beam body B rotate, so that the main drive chain wheel 40, chain wheel 6
4 rotates. The operation caused by the rotation of the main chain wheel 40 will be described later, but the rotation of the chain wheel 64 rotates the shearing blade roll 16 of the shearing section 17 of the reinforcing short fiber supply device D, and the glass fiber roping 11 is transferred to the receiving port 12. The short fibers are then cut into approximately 2 to 8 (1771) short fibers, and are then dropped and supplied onto the inner surface 18 of the cylindrical mold A from the drop opening 19.The fallen short fibers are as shown in FIG.
Since the cylindrical mold A is rotated in the direction of the arrow X, it forms a band G having a certain height t and is discharged below the two nozzles 20 and 21 of the reinforcing fiber binding agent discharge device E. I'll go.

Since a mixture of unsaturated polyester resin and catalyst is discharged from the nozzle 20 in a linear form from the pores 22, the mixed composition has short fibers arranged in an at random manner to form a strip G. The mixed composition of the unsaturated polyester resin and the curing accelerator is then discharged from the nozzle 21 in a linear form from the pores 22. The unsaturated polyester resin is added to the mixed composition already impregnated into the short fibers, and the unsaturated polyester resin is sufficiently distributed together with the catalyst and the curing accelerator. Such a strip G is then sent to the lower part of the roller 35 of the reinforcing fiber and reinforcing fiber binding agent mixing roller device F, but the drive shaft 44 also rotates with the rotation of the drive shaft 65 mentioned above, The chain wheel 40 uses an endless chain 43 to rotate each roller 35 in the same direction and synchronously with the cylindrical body A at the same linear speed, and since each roller 35 is pressed down by the air cylinders 30 and 31, the above-mentioned The strip G containing a mixture of unsaturated polyester resin, catalyst, and curing accelerator is pressed onto the inner surface 18 of the cylindrical mold.

Moreover, since grooves are cut on the outer periphery of the roller 35, pressure is applied at the edges of the grooves, and the pressure is released within the grooves, so that the mixture is well mixed, air bubbles, etc. are sufficiently eliminated, and a thin strip plate is formed. Since the reciprocating sliding body C moves in a spiral trajectory on the inner surface of the cylindrical mold A, a thin cylindrical body is gradually formed.
When the reciprocating sliding body C is reciprocated on the beam B, the spiral trajectories intersect, and by rotating the cylindrical mold A multiple times, the thickness of the cylindrical body increases in layers. As a result, a so-called FRP pipe, which is an unsaturated polyester resin pipe reinforced with short glass fibers, is formed. After the unsaturated polyester resin pipe is formed in the cylindrical mold A, it is cured and then the cylindrical mold A is opened to take out the pipe. However, according to the above-mentioned work, the amount of FRP such as polyester resin laminated at both end edges of the formed pipe is less than the amount of laminated material halfway inside the pipe, and the strength of the pipe decreases closer to both end edges, so we have devised measures to prevent this. However, in this device, when the reciprocating sliding body C reaches both ends of the reciprocating stroke, the eighth
As shown in the figure, actuate the cylinder 26 to move the piston rod 27, and use the rack 27' on the side to open the pore 22 at the end of the nozzle (the end in the advancing direction just before the reciprocating slide C stops at the end of the stroke). The remaining pores are closed by rotating the cover plate 25, and the reciprocating slider C is made to remain stationary at least during one revolution of the cylindrical mold A at the end of the reciprocating stroke, and rather, the reciprocating slider C remains stationary at the end of the reciprocating stroke while the cylindrical mold A rotates at least once. The edge portion can be made thicker as shown in FIG.

Note that a limit switch and a timer may be used to keep the reciprocating sliding body C stationary while the cylindrical mold A rotates at least once. When using the apparatus described in detail above, short glass fibers are first dropped onto the inner wall of a cylindrical mold A rotating at a low speed, and a thermosetting resin material and a catalyst are placed on top of the flow of the short fiber layer. Two types of thermosetting resin compositions, such as a mixed composition or a mixed composition of a thermosetting resin material and a curing accelerator, which are cured when both are mixed, are discharged, and the resin and fibers are cured. A mixture is prepared, and then the resin and fiber mixture is rolled using a plurality of rollers that are rotatably provided in the cylindrical mold in parallel with the central axis direction of the cylindrical mold and have uneven surfaces on the outer periphery. The two types of thermosetting resin compositions impregnated with the resin and fiber mixture are thoroughly mixed by pressing onto the inner wall surface of the mold by repeatedly pressing and releasing the pressure with the roller surface to form the cylindrical mold. When making an FRP pipe by attaching it to the inner wall of A, the cylindrical nozzle having the pores 22 in the lower generatrix direction for discharging the two types of thermosetting resin compositions has its center axis 02-02 aligned with the low speed The nozzle is placed close to the inner wall of a rotating cylindrical mold A and parallel to the central axis 0-0 of the mold A, and the nozzle is reciprocated in the direction of the central axis 0-0 of the mold A. The mold A is made to stand still during at least one rotation at a desired point in the stroke of motion, and during that time, the pores 22 of the nozzle are left open only at the portion corresponding to the said point. Able to carry out the method of manufacturing pipes.

In other words, in FIG. 9, if the nozzle 20 advances in the direction of the arrow y and comes to rest, the nozzles 20 and 21 are drilled in the generatrix direction while leaving only the middle shielding plate 251 in FIG. While opening the provided pores 22, open the other shielding plate 2.
5 operate to close the pores 22, so that a rib I can be created at the right end of the FRP pipe K in FIG.
By doing the same thing when the pipe moves forward and comes to a standstill, the rib J at the left end of the FRP pipe K in FIG. 13 can be made. In addition, a number of limit switches are provided between the strokes of the reciprocating sliding body C, and the limit switches are operated at desired points during the stroke so that the reciprocating sliding body C is stopped while the mold A makes at least one revolution; If the center part of the nozzle is also made to cover the pores 22 with a number of thin plates, and only the part corresponding to the desired stopping point is left open, the ribs will be formed not only at the ends of the pipe, but also at the ends of the pipe. It can also be made in other parts. The manufacturing method of FRP pipe, which is the basis of this invention, consists of a group of short fibers that are dropped under their own weight onto the inner surface of a cylindrical mold A that rotates at a low speed, and a mixture of resin that is discharged onto the inner surface of the cylindrical mold A and is then molded into a cylindrical mold using a roller. Unlike the centrifugal molding method in which the pipe forming material is attached to the inner surface of the cylindrical mold by centrifugal force, forming the pipe by pressing it against the inner surface of the cylindrical mold A allows the resin and fibers to remain even when the cylindrical mold A is rotated at low speed. When the mixture rotates upward, it does not fall, and the reinforcing short fibers can be mixed in the synthetic resin liquid in an atrandum direction, making it possible to create a molded material using the conventional centrifugal molding method. It has extremely high strength compared to conventional synthetic resin liquid mixtures, and the short fibers and resin are often mixed together without being separated, and if the raw material yield can be sacrificed to some extent, synthetic resin liquid mixtures can be used. It is also possible to inject the resin into reinforcing fibers, but as mentioned above, the yield of raw materials can be improved by impregnating the reinforcing fibers into thin wires. However, this invention method eliminates this drawback, and in particular, it is possible to obtain a strong FRP pipe in which both ends of the pipe are made stronger than other parts, which is completely impossible with the centrifugal forming method. Of course, ribs can be formed at desired locations inside and outside the pipe.

[Brief explanation of the drawing]

The drawings show an apparatus used to carry out the method for manufacturing an FRP pipe with ribs according to the present invention, in which Fig. 1 is a vertical front view, Fig. 2 is a side view, and Figs. This is an explanatory diagram of how to handle reinforcing fiber roping. Figure 3 is a front view of the beam, Figure 4 is a plan view, Figure 5 A is a side view of the roping guide, Figure 5 is its front view, and Figure 5 is a side view of the roping guide. Figure 6 is an enlarged side view showing the relationship between the reciprocating sliding body and the beam body, Figure 7 is its front view, and Figure 8 is its front view.
The figure is an enlarged side view of the pore-closing plate, and Figure 9 is its front view.
Fig. 10 is an explanatory diagram of the handling of the synthetic resin liquid introduction pipe, Fig. 11 is a front view of the beam support housing frame 6, Fig. 12 is a side view thereof, and Fig. 13 is an FRP with ribs on the inner periphery of both ends. 14 is a side view of a pipe with one nozzle, and FIG. 15 is a perspective view of the whole. 22 is a narrow nozzle, ILAA is a cylindrical type, and O-0 is a cylindrical type. The central axis of type A,
02-02 respectively indicate the central axis of the cylindrical nozzle.

Claims (1)

[Claims] 1 First, short glass fibers are dropped onto the inner wall of a cylindrical mold A rotating at a low speed, and a mixed composition of a thermosetting resin material and a catalyst and a thermosetting resin material are placed on top of the flow of the short fiber layer. Discharging two types of thermosetting resin compositions that are cured when both are mixed, such as a mixed composition of and a curing accelerator,
A resin and fiber mixture is prepared, and then the resin and fiber mixture is rolled using a plurality of rollers that are rotatably provided in the cylindrical mold in parallel with the central axis of the cylindrical mold and have uneven surfaces on the outer periphery. is pressed onto the inner wall surface of the mold, and the two types of thermosetting resin compositions impregnated with the resin and the fiber mixture are thoroughly mixed by repeated pressing and releasing of the pressing by the roller surface to form the cylinder. When making an FRP pipe by attaching it to the inner wall of shape type A, the cylindrical nozzle having the pores 22 in the lower generatrix direction for discharging the two types of thermosetting resin compositions has its central axis O_
2-O_2 is the cylindrical mold A that rotates at a low speed.
The nozzle is placed close to the inner wall of the mold A in parallel with the central axis O-O of the mold A, and the nozzle is reciprocated in the direction of the central axis O-O of the mold A at a desired point in the stroke of the reciprocating movement. The type A
A method for manufacturing an FRP pipe having ribs, characterized in that the nozzle is kept stationary for at least one rotation, and during that time, only the portion of the nozzle corresponding to the aforementioned location is left open.