JPH044139B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an FRP bent pipe in which a roving is wound around a core mold for forming a bent pipe using a novel feeding method.

Up until now, FRP bent pipes (hereinafter simply referred to as "bent pipes") have been formed mainly by the manual hand lay-up method or the mechanical filament winding method (hereinafter referred to as the "FW method"). There is. However, the following problems have been pointed out in both methods.

In other words, although the equipment and equipment costs are low in the hand lay-up method, productivity is extremely poor because it is manual work, and the roving content is low due to pressureless forming, resulting in a significantly lower mechanical strength of the molded product. It has a fatal flaw. For example, the strength of a molded product obtained by the hand lay-up method is only about 1/5 of the strength of a molded product of the same size obtained by the FW method. Of course, it is possible to increase the strength of the molded product by increasing the roving content, but the rate of increase is so small that it only unnecessarily increases the roving cost, which is extremely uneconomical.

On the other hand, the FW method has the disadvantages of the hand lay-up method mentioned above.
It was developed in particular to solve the problem of poor molded product strength, and is made by continuously wrapping and arranging rovings with high tensile strength around the surface of a core mold for curved pipe forming so as to receive stress in the tensile direction. It is possible to form curved pipes with extremely high mechanical strength. That is, the case of forming a curved pipe by the FW method will be explained based on FIG. 1 (schematic side view) and FIG. It is arranged so as to be able to rotate around a non-rotating core mold for curved pipe forming (hereinafter simply referred to as "core mold") 2 of the supply device 3. That is, flat plate bearing 4
By arranging the core mold 2 approximately above the center of the turntable 5 which is pivotally supported at the center of the turntable 5, and by connecting the top surface of the core mold 2 to the driver 7 via the L-shaped arm 6, The core mold 2 is rotated about the fulcrum P in the direction of the up and down arrows. On the other hand, near the outer peripheral edge of the turntable 5, there is a roving guide support formed by setting a roving unit support hollow base 9 and a roving guide 10, which are formed by setting a plurality of roving units 8 in substantially symmetrical positions about the pivot point. A hollow base 11 is arranged, and a resin bath 12 is placed on the upper surface of the turntable 5 between the roving unit support hollow base 9 and the roving guide support hollow base 11. In such a FW molding machine 1, the rovings pulled out in a bundle from each roving unit 8 are impregnated with an appropriate resin liquid in the resin bath 12, and then transferred to the roving guide support hollow base 1.
1. Through the roving guide 10, the thread is continuously supplied from the thread leading-out member 13 at the tip of the guide 10 in two directions to the core mold. The above roving is turntable 5
is supplied while rotating at a predetermined speed,
The resin-impregnated roving is wound around the core mold 2 under appropriate tension, and as the winding progresses, the core mold 2 is gradually rotated in the direction of the upward arrow in the figure, which improves mechanical strength. A curved pipe with excellent properties can be formed relatively efficiently. As described above, the conventional FW method has greatly contributed to increasing the mechanical strength of molded products, but there has been a strong desire to solve the following problems arising from the unique structure. That is, according to the above-mentioned FW method, it is possible to widen the filament in the circumferential direction of the core mold 2, but since it is not possible to layer roving in the axial direction of the core mold 2, a blind weave is used instead. A roving workpiece such as a filament or a glass roving mat was separately wound onto the core 2 to serve as a substitute for the axial roving. That is, in addition to the process of winding in the circumferential direction, a process of attaching the roving workpiece in the axial direction is required, and there is also an economical problem due to the use of expensive workpieces. That is, processed products such as the above-mentioned blind-woven filaments or roving mats are products obtained by further processing roving, and the raw material costs are higher than that of the roving itself.

The present invention solves the above problems by arranging the core mold in the circumferential direction and attaching it in consideration of the above circumstances, and provides a method for forming a curved pipe that is advantageous in terms of quality and economy. It was made for the purpose of
The configuration of the present invention that has achieved such objects is that the rovings are centripetally supplied from the outer periphery of the core mold to the outer circumferential surface of the core mold, and the rovings are supplied in the axial direction of the core mold. The roving is configured to be supplied from at least three different positions, and the rovings supplied from both ends of the rovings are wound around the core mold while swinging the core mold in the tube axis direction, and the rovings supplied from the center are wound around the core mold. The gist is to place it in the axial direction of the core mold.

The configuration and effects of the present invention will be explained below in detail based on the drawings shown in the examples, but the examples below are only one specific example, and the design may be modified in various ways in keeping with the spirit described above and below. All of these are included within the technical scope of the present invention.

FIG. 3 is a schematic side view of a bent pipe manufacturing apparatus 31 used when carrying out the method of the present invention. FIG. 4 is a schematic illustration of a cross section taken along the line - in FIG. 3, FIG. 5 is an illustration of the roving bobbin holder shown in FIG. 4, and FIG. 6 is a schematic illustration of a cross section taken along the line - in FIG. 3. 7 is an explanatory diagram of the roving bobbin holding section shown in FIG. 6, and FIG. 8 is a perspective view of the main part of the rotating creel section shown in FIG. 3. The bent tube forming device 31 has creels A, 3 and 3 at three different positions when viewed from the central axis P ₁ and P ₂ of the core 32 in order to centripetally supply roving to the outer peripheral surface of the core 32.
B and C are provided. That is, creel A at both ends
and C are rotating creels that rotate periodically in the same direction, and the central creel B is a stationary creel that does not rotate. Each creel A, B, and C is a hollow donut-shaped member with a U-shaped cross section, and a plurality of roving bobbins 38 are provided along the circumferential direction on the bottom surface 48 of the U-shaped portion so that the rovings can be freely fed out. They are provided at approximately equal intervals. (The roving bobbin is omitted in Fig. 8). In the previous figure, each creel A, C has a circular hollow side edge and an outer circumferential edge, and creel B has a square hollow side edge and an outer circumferential edge, and the core mold 32 penetrates through the hollow part of each creel B. has been done. and circular creel A,
An annular rack 41 is attached to the outer peripheral surface of creels A and C, and the drive of the motor 34 is transmitted to the annular rack 41 via a drive shaft 46 and a pinion 33.
are designed to rotate synchronously in the same direction. Reference numeral 35 denotes a spray device for applying and moistening the thermosetting resin liquid to the roving wound or placed around the core mold 32. In addition, the core mold 32 is adjusted in the axial direction, that is, the curvature circumference of the core mold 32 by means not shown.
It is configured to be able to swing back and forth along P ₁ and P ₂ as shown by the arrow. In FIG. 4, three grooved guide rollers 37 are mounted on a fixed frame member 36.
As shown in FIG.
By fitting into the groove 47 of No. 7, the creel A is prevented from falling to the left or right in the figure. Therefore, due to the rotation of creels A and C, the roving bobbin 3
The roving 42A fed out from the roving 8 passes through the roving guide hole 39 and is wound around the core mold 32. Also, as shown in Figures 6 and 7, fixed creel B
The U-shaped portion 48 is provided with a roving guide pipe 40 for guiding the roving 42B fed out from each roving bobbin 38. This is to prevent the rovings 42B from being dragged in the axial direction of the core mold 32 due to the swing of the core mold 32, thereby preventing the correct stacked structure from being disturbed.

Next, FIGS. 9a and 9b show, as a model, the procedure for winding the roving 42 around the core mold 32, which is being formed into a curved tube, using creels A, B, and C according to the method of the present invention. In Fig. 9a, rotating creels A and C
The rovings 42A and 42C fed out from the stationary creels A and C are wound around the core mold 32 by the rotation of the rotary creels A and C, and at the same time, the rovings 42B fed out from the stationary creel B are placed in the axial direction of the core mold 32. However, as the core mold 32 swings in the direction of the arrow, the roving 42C moves in the opposite direction to the swing of the core mold 32 while forming a wound layer 43C. The roving 42B is placed on the wound layer 43C along the core axis, and moves in the opposite direction to the swing of the core mold 32 while forming the laminated layer 43B. Roving 42A fed out from rotating creel A
is wound onto the wound layer 43C and laminated layer 43B, and moves simultaneously with the creels B and C in the direction opposite to the swing of the core mold 32 while forming the wound layer 43A. That is, the roving 42B supplied from the stationary creel B is placed between the wound layers 43C and 43A formed by the rotation of the creels C and A as described above.
The laminated layer 43B placed in the axial direction is sandwiched between the two winding layers, and the laminated layer 43B is tightly gripped between the two winding layers to form a bent pipe. 9th
Figure b is a diagram showing a stage where the swing of the core mold 32 is reversed to that shown in a, as indicated by the arrow, and the roving 42A forms the wound layer 43A again just above the wound layer 43A in the direction opposite to the swing. Then, the laminated layer 43B is formed on the wound layer 43A, and the wound layer 43A is further formed thereon. Also roving 42A, 42
Since the rovings 42A and 42C form the wound layers 43A and 43C and the laminated layer 43B wound or placed on the core mold 32, respectively, and are fixed on the core mold 32, the rovings 42A and 42C are attached to the creels A and C. Tension is generated by the rotation, and the roving 42B is freely paid out from the roving bobbin 38, and the roving 42B can be paid out by generating tension by the swing of the core mold 32.
It can be wound and placed continuously and smoothly. In addition, as can be understood from the situation at the end of the core mold 32 in FIG. 9, the core mold 3
At the left and right ends of 2, there are parts where there is no winding layer or lamination, or where there is less than the central part, so the core type 3 is longer than the required length of the bent pipe from the beginning.
It is recommended that you prepare 2. Also core type 32
The amplitude and period of the swing, the number of rotations of the rotating creels A and C, ie, the number of windings of the roving, the number of laminations, etc. can be appropriately selected depending on the desired characteristics of the curved pipe to be formed. It is also possible to automate the process by adding an automatic control device.

Since the present invention is configured as described above, the winding of the roving in the circumferential direction of the core mold for curved pipe forming and the lamination in the axial direction can be performed at the same time, which is uniform and efficient in terms of quality. It has become possible to form bent pipes with multilayer structures, which are also advantageous.

[Brief explanation of drawings]

Figure 1 is a schematic side view of a conventional FW molding machine, Figure 2 is a schematic side view of a conventional FW molding machine.
The figure is a schematic plan view of the same, FIG.
FIG. 4 is a schematic explanatory diagram of the cross section taken along the line - in FIG. 3;
Fig. 5 is an explanatory diagram of the roving bobbin holder shown in Fig. 4, Fig. 6 is a schematic sectional view taken along the - line in Fig. 3, and Fig. 7 is an explanatory diagram of the roving bobbin holder shown in Fig. 6. The explanatory diagram, Figure 8, is a perspective view of the main part of the rotary creel shown in Figure 3, and Figure 9.
The figure is an explanatory diagram illustrating a method for forming a curved pipe according to the method of the present invention. 31... Bent pipe forming device, 32... Core mold for bending pipe forming, 33... Pinion, 34... Motor, 35...
... Spray device, 36 ... Frame member, 37 ... Grooved guide roller, 38 ... Roving bobbin, 3
9... Roving guide hole, 40... Roving guide pipe, 41... Annular rack, 42... Roving, 43... Wound layer, 44... Lamination, 45
... Bobbin shaft, 46 ... Drive shaft, 47 ... Groove, 4
8... Bottom part, A, C... Rotating creel, B...
...Fixed creel.

Claims (1)

[Claims] 1. Rovings are supplied centripetally from the outer periphery of the core mold for curved pipe forming to the outer peripheral surface of the core mold, and the rovings are supplied from at least three different positions in the axial direction of the core mold. configuring, while swinging the core mold in the tube axis direction, winding the rovings supplied from both ends of the rovings around the core mold, and placing the rovings supplied from the center in the axial direction of the core mold. A method for forming FRP bent pipes.