JPS59171619A - Molding of curved frp pipe - Google Patents

Abstract

PURPOSE:To obtain highly reinforced FRP curved pipe at a low cost by a method wherein a roving is wound about the outer circumference of a core to mold a curved pipe in the circumferential direction and many rovings are supplied in the axial direction and wound about the core in swinging operation. CONSTITUTION:Creels A-C are arranged in the axial direction of a core 32, the creels A, C are revolved synchronously in the same direction and the middle creel B is fixed. Plural roving bobbins 38 are arranged nearly at equal intervals along the circumferential direction on each creel A-C. The rovings 42A, 42C drawn from the creels A, C are wound about the core 32, the roving 42B drawn from the fixed creel B is mounted in the axial direction of the core 32 but moves in the reverse direction against the swing of the core 32 as it is providing a wound layer 43C. The curved pipe is coated with thermosetting resin liquid injected from a spring 3, is heated to provide FRP curved pipe about the outer circumference of the core 32.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for forming an FRP bent pipe in which 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 mainly been formed using the hand lay-up method.
This is carried out by a mechanical filament ink method (hereinafter referred to as the "FW method"). However, the following problems have been pointed out in both methods.

Although the equipment and equipment costs are low in the instant hand lay-up method, the productivity is extremely low because it is manual work, and the number of non-pressure moldings and roving content is low, so the mechanical strength of the molded product is extremely low. It has a fatal flaw. For example, the strength of molded products obtained by hand layup method is FW
This is only an approximation of the strength of a molded product of the same size obtained by the 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 was developed to solve the drawbacks of the hand lay-up method mentioned above, especially the poor strength of the molded product. By arranging the windings continuously on the surface of the core mold, a curved pipe with extremely high mechanical strength can be formed. In other words, when forming a bent pipe using the FW method,
To explain based on FIG. 1 (schematic side view) and FIG. 2 (schematic plan view), 1 is a FW forming machine, in which a rotary roving adjustment/supply device 3 is connected to a non-rotating core mold for curved pipe forming. (Hereinafter simply referred to as "core type") It is arranged so that it can rotate in two directions. That is, the core mold 2 is disposed approximately above the center shaft of the turntable 5 which is pivotally supported at the center of the flat bearing 4, and
By connecting the top surface of the core mold 2 to a driver 7 via an L-shaped arm 6, the core mold 2 is rotated about a fulcrum P in the directions of the up and down arrows. On the other hand, near the outer periphery 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, each of which has a plurality of roving units 8 set in substantially symmetrical positions around the pivot point. A hollow base 11 is provided, and a resin bath 12 is mounted 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 FW molding 41a1, 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 11. The yarn is continuously supplied through the roving guide 10 from the yarn guide member 13 at the tip of the guide 10 toward the two core molds. Since the roving is supplied while rotating the turntable 5 at a predetermined speed, the resin-impregnated roving is wound around the core 2 with an appropriate tension applied, and as the winding progresses, the resin-impregnated roving is Since the core mold 2 is gradually turned in the direction of the upward arrow in the figure, a curved pipe with excellent mechanical strength can be formed relatively efficiently. As described above, the conventional FW method has greatly contributed to increasing the mechanical strength of molded products, but it has been strongly desired to solve the following problems arising from the unique structure. That is, according to the above-mentioned FW method, filament winding in the circumferential direction of the core 2 is possible, but since it is not possible to stack roving in the axial direction of the core 2, blind weave is used as an alternative. A roving workpiece, such as a filament or a glass roving mat, was separately wound onto the core mold 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 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 purpose of the present invention is to solve the above-mentioned problems by circumferentially and attaching the core mold in consideration of the above-mentioned circumstances, and to provide a method for forming a curved pipe that is advantageous in terms of quality and economy. The structure of the present invention that has achieved such an object is to supply roving centripetally from the outer periphery of the core mold to the outer peripheral surface of the core mold, and to supply the rovings in a centripetal manner. The rovings are configured to be supplied from at least three different positions in the axial direction of the core mold, 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. In addition, the gist is to place the roving supplied from the center 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 showing the embodiments. However, the embodiments 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 forming apparatus 31 used when carrying out the method of the present invention. Figure 4 is 1V of Figure 3.
5 is a schematic explanatory diagram of the roving bobbin holding section shown in FIG. 4, FIG. 6 is a schematic explanatory diagram of the Vl-M line cross section of FIG. 3, and FIG. 6 is an explanatory view of the loading 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 and B at three different positions as viewed from the central axis P and P2 direction of the core W32 in order to centripetally supply rovings to the outer circumferential surface of the core mold 32.

C is provided. That is, creels A and C at both ends are rotating creels that rotate synchronously in the same direction, and creel B at the center is a stationary creel that does not rotate. Each of the creels A, B, and C is a hollow donut-shaped member with a U-shaped cross section, and a plurality of roving bobbins 38 are dipped in the circumferential direction on the bottom surface 48 of the U-shaped portion so that the rovings can be freely fed out. The roving bobbins are provided at approximately equal intervals (the roving bobbins are omitted in FIG. 8). Last time, each creel A
, C have both a circular hollow side edge and an outer peripheral side edge, and a creel B has a square hollow side edge and an outer peripheral side edge, both of which have a core mold 32 penetrating through the hollow portion. An annular rack 41 is attached to the outer peripheral surface of the circular 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 to cause the creels A and C to rotate synchronously in the same direction. It has become. Reference numeral 35 denotes a spray device for coating and moistening the thermosetting resin liquid onto the roving which is placed around the core mold 32. Further, the core mold 32 is moved in the axial direction, that is, the core mold 3 by means not shown.
It is configured to be able to swing forward and backward along the curvature circumferences P and P2 of 2 as shown by the arrow.

In FIG. 4, three grooved guide rollers 37 are attached to the fixed frame member 36 so as to be rotatable in three directions, and as shown in FIG. 47 prevents the creel A from falling to the left or right in the figure. Therefore, the roving 42A fed out from the roving bobbin 38 by the rotation of the creels A and C is transferred to the roving guide hole 39.
After that, it is wound around the core 32. Further, as shown in FIGS. 6 and 7, the U-shaped portion 48 of the fixed creel B is provided with a roving guide pipe 40 for guiding the rovings 42B paid 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 correct lamination.

Next, FIGS. 9(a) and 9(b) show, in model form, the procedure for winding the roving 42 around the core mold 32, which is being formed into a curved pipe according to the method of the present invention, using creels A, B, and C.

In FIG. 9(a), rovings 42A, 42C paid out from rotary creels A, C are rotary creels A,
The roving 42 is wound around the spindle of the core mold 32 by the rotation of C, and at the same time is let out from the stationary creel B.
B is placed in the axial direction of the core mold 32, but as the core mold 32 swings in the direction of the arrow, the roving 42C is placed on the core mold 32.
It moves in the opposite direction to the swing while forming the wound layer 43C. The roving 4'2B 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. The roving 42A unwound from the rotating creel A is wound onto the wound layer 43C and the laminated layer 43B, and moves simultaneously with the creels B and C in a direction opposite to the swing of the core mold 32 while forming the wound layer 43A. do. That is, the laminated layer 43B placed in the axial direction is sandwiched between the wound layers 43C and 43A formed by the rotation of the creels C and A as described above by the roving 42B supplied from the fixed creel B. Now, the laminated layer 43B is firmly held between the two winding layers to form a bent pipe. FIG. 9(b) is a diagram showing a stage in which the swing of the core mold 32 is reversed from that in FIG. 9(a), as indicated by the arrow.
The roving r2A moves in the opposite direction to the swing while forming the wound layer 43A again just above the wound layer 43A, and then the laminated layer 43B is formed on the wound layer 43A, and the wound layer 43A is further formed on it. be done. Also roving 42A, 42B.

4 and 2C form the wound layers 4.3A and 43C wound or placed on the core mold 32, respectively, and the laminated layer 43B, and are fixed on the core mold 32, so that the roving 42A
, 42C are freely paid out from the roving bobbin 38 due to the tension generated by the rotation of the creels A and C, and the roving 42B is payable by the tension generated by the swing of the core mold 32, and is continuously and It can be rolled and placed 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 are no winding layers or laminations, or where there are fewer layers than in the center, so prepare a core mold 32 that is longer than the required length of the bent pipe from the beginning. It is recommended that you leave the Further, the swing amplitude and period of the core mold 32, the number of rotations of the rotating creels A and C, ie, the number of windings of the roving, the number of layers, 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 also become possible to form curved tubes with multi-layered structures.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view of a conventional FW forming machine, Fig. 2 is a schematic plan view thereof, Fig. 3 is a schematic side explanatory view of a bent pipe forming apparatus used when carrying out the method of the present invention, and Fig. 4 is a schematic side view of a conventional FW forming machine. ■- in Figure 3
■A schematic explanatory diagram of the heddle cross-section viewed from the arrows, Figure 5 is an explanatory diagram of the roving bobbin holding part shown in Figure 4, and Figure 6 is an explanatory diagram of the roving bobbin holding part shown in Figure 3.
7 is an explanatory diagram of the roving bobbin holder shown in FIG. 6, and FIG. 8 is a perspective view of the main parts of the rotary creel shown in FIG. FIG. 9 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 3 for bending pipe forming
3...Pinion 34...Motor 35...Spray equipment fθ 36...Frame member 37...Rubbing prevention guide roller 38...Roving bobbin 39...Roving guide hole 40... Roving guide pipe 41...Annular rack 42...Roving 43.
...Wound layer 44...Lamination layer 45...Bobbin shaft 46...Drive shaft 47...Groove 48
...Bottom parts A, C...Rotating creel B...Fixed creel Applicant: Kubota Iron Works Co., Ltd. Figure 6 Figure 8

Claims (1)

[Claims] The rovings are centripetally supplied 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 orders in the axial direction of the core mold. and, 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 an FRP bent pipe characterized by: