JPS59162022A - Manufacture of frp bent pipe - Google Patents

Abstract

PURPOSE:To improve productive efficiency and economy by a method wherein roving is wrapped about a bent pipe molding core, the roving is impregnated with thermosetting resin liquid to form a bent pipe, to be hardened by heat treatment and to be pulled continuously as finished product from the core. CONSTITUTION:Roving 34 drawn by the revolution of creels A, C out of a roving bobbin 44 is wrapped about a core 32 through a roving guide hole 51. Since a roving guide pipe 52 is mounted on the bottom 43 of a fixed creel B, the roving drawn out is guided to the neighborhood of the core 32 in good order and laminated about the wrapped roving drawn out of the rotary creel A. On the other hand, a resin liquid spray 35 is equipped at the end of the forming part 33 of the bent pipe, the roving is impregnated with resin liquid, passed through the inner part of a circular heater 37 for thermosetting treatment, formed by completion of thermosetting process into a bent pipe 36. Since conveyors 38, 39 grip the outer periphery of the bent pipe 36, draw it from the core 32 and carry it, all operations can be carried out continuously by a single process in improved productive efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing an FRP bent pipe in which a roving is wound around a core mold for forming a curved pipe, and in particular, the method includes winding and thermosetting of the roving and drawing of the core mold. This invention relates to a continuous method for manufacturing bent FRP pipes.

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

In other words, in the hand lay-up method, equipment and equipment costs are low, but productivity is extremely low because it is manual work, and the roving content is low due to pressureless forming, which significantly reduces the mechanical strength of the molded product. It has a fatal flaw. For example, the strength of molded products obtained by hand layup method is FW
The strength is only about - that of a molded product of the same size obtained by the method.

Of course, increasing the roving content can increase the strength of the molded product, but the rate of increase is small. Although the strength of the molded product can be increased by making the wall thicker, it is extremely uneconomical as it unnecessarily increases the material cost.

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 core surface, a curved pipe with extremely high mechanical strength can be formed. 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. 2 (schematic plan view). 1 is a FW forming machine, which has a rotary roving adjustment and supply device. 3 is rotatably arranged around a non-rotating core mold for curved pipe forming (hereinafter simply referred to as "core mold") 2. That is, the core mold 2 is disposed approximately above the center of the turntable 5 which is pivotally supported at the center of the flat plate 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 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 PW molding machine 1, rovings pulled out in a bundle from each roving unit 8 are impregnated with an appropriate resin liquid in a resin bath 12, and then passed through a roving guide 10 to form a thread at the tip of the guide 10. It is continuously supplied from the derivation member 13 in two directions to the core mold. Since the roving is supplied while rotating the turntable 5 at a predetermined speed, the resin-impregnated roving is wound around the core mold 2 with an appropriate tension applied, and the progress of the winding is controlled. At the same time, 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 conventional FW method, the bent tube after the winding and forming of the roving is subjected to heat curing treatment in the next step, and then the core mold is separated and the bent tube is removed.
Furthermore, since the bent pipe manufacturing method is a non-continuous batch type in which the core mold is reassembled for the next roving wrapping, the time required for one cycle of bent pipe manufacturing is quite long. There were some points that needed to be improved from both a production efficiency and economical standpoint, such as the need for multiple core types of the same diameter if bent pipes of different diameters were to be manufactured at the same time.

The present inventors took the above circumstances into consideration, and formed a curved pipe.
The present invention aims to solve the above-mentioned problems by continuously carrying out thermosetting treatment and drawing of the bent pipe from the core mold in one step, and to provide an efficient and economically advantageous FRP bent pipe manufacturing method. It is something.

In other words, the configuration of the present invention that achieves the object is that the roving is centripetally supplied from the outer periphery of the core mold to the outer circumferential surface of the core mold, and the roving is wound around the core mold. With,
The roving is impregnated with a thermosetting resin liquid to form a curved pipe, and then the curved pipe is continuously subjected to a thermosetting treatment while being continuously pulled out and automatically cut into a desired length as a completed core-shaped molded product. The gist of this is to

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 cross-sectional explanatory diagram of a curved pipe manufacturing apparatus used when carrying out the method of the present invention, FIG. A schematic explanatory view taken along the v-v line and viewed from the arrows. That is, FIG. 3 above shows the core mold 32 for forming a curved pipe.
The roving is wound around the roving, and the roving is impregnated with a thermosetting resin before, at the same time as, or after the winding (in the embodiment, it is impregnated after the winding), and then the annular heater 37 4.5 shows a curved tube manufacturing apparatus 31 which is being formed into a curved tube 36 while being subjected to a thermosetting treatment and is being continuously drawn out from the core mold 32 in the direction of the arrow by the first conveyor 38 and the second conveyor 39. The figure shows bent pipe forming part 3
3, in particular, FIG. 4 shows a rotary creel A for winding rovings, and FIG. 5 shows a stationary creel B for laminating rovings. To explain in detail below, in FIG. 3, the core mold 32 is pivotally supported at the zero point of a fixed base 42 via a stand 41, and is configured to be able to rotate within a certain angular range by a drive mechanism not shown in the drawings. At the stage shown in Fig. 3, it is fixed at the position shown (details will be described later, but the core
rotates only at startup and remains fixed during continuous production of bent pipes). Further, one end 32a of the core mold 32 is provided with a fitting 54 for attaching an auxiliary core mold 53, which will be described later, to the bottom, and is configured so that the auxiliary core mold 53 can be detached with a tensile force exceeding a certain limit. ing. The bent tube forming section 33 includes (1) a rotary creel A that rotates synchronously in the same direction to centripetally supply and wind the rovings 34 from the outer periphery of the core mold 32 to the outer peripheral surface of the core mold 32; C, (2) a non-rotating stationary creel B that laminates the rovings 34 along the length direction of the core mold 32, and (3) impregnates the wound or laminated rovings 34 with a thermosetting resin liquid. Consists of resin liquid spray 35.35.

Note that the curved tube forming means such as winding and laminating the roving or impregnating it with a thermosetting resin liquid may be any known method, such as the above-mentioned FW forming machine, or the known method of this embodiment. A rotary creel system (which has already been filed by the applicant of this patent) may also be used. Each creel A, B, C
is a hollow doughnut-shaped member having a U-shaped cross section, and a plurality of roving bobbins 44 are provided in the circumferential direction at approximately equal intervals on the bottom surface 43 of the U-shaped portion so that each roving 34 can be freely fed out. provided. In the top view, each of the rotating creels A and C has a circular hollow side edge and an outer circumferential edge, while the fixed creel B has a square hollow side edge and an outer circumferential edge. A core mold 32 is installed therethrough. An annular rack 45 is attached to the outer peripheral surface of the circular rotating creels A and C, and the drive of the motor 46 is transmitted to the annular rack 45 via a drive shaft 47 and a pinion 48 to move the rotating creels A and C in the same direction. It is configured to rotate in synchronization with the Three grooved guide rollers 5o are attached to the fixed frame member 49 in FIG. Prevents falls.

Therefore, the roving 34 paid out from the roving bobbin 44 by the rotation of the rotary roll IJ-ru AIC passes through the roving guide hole 51 and is wound around the core mold 32.

Also, the U-shaped bottom portion 43 of the fixed creel B shown in FIG.
Since a roving guide pipe 52 is provided for guiding the roving 34 paid out from each roving bobbin 44, the paid roving is guided as close as possible to the core mold 32 without being disturbed. The roving is then laminated onto the winding roving coming out of the rotating creel A. On the other hand, a resin liquid spray 35 is installed at the final part of the curved pipe forming section 33, and the roving is impregnated with the resin liquid. After passing through the annular heater 37 and completing thermal curing, the bent pipe 3
It is molded as 6.

38. 38 and 39 grip the outer periphery of the bent pipe 36 and
A caterpillar type conveyor is provided to pull out the curved pipe 36 from the core mold 32 and convey it. Bent pipe 36 from above and below along
It is provided at a position where it can be rotated in the direction of the arrow. The distance between the upper part of the first conveyor 38 and the end of the core mold 32 is determined by the distance between the upper part of the first conveyor 38 and the end of the core mold 32. 5
The distance must be such that the outer periphery of the curved pipe 36 formed on the outer periphery of the tube 3 (see FIG. 6(C)) can be held therebetween. The second conveyor 39.39 is provided along the outer periphery of the curved pipe 36 following the M1 conveyor 38.38, and the second conveyor 39.39 is
From 8.38 onwards, the receiver is configured and arranged to be able to pinch and convey the outer periphery of the bent tube 36 in order to convey the passed bent tube 36.

The first conveyor 38.38 and the second conveyor 39°3
The upper and lower conveyors 9 are configured to synchronize and move in the direction of the arrow at the same speed by a drive means such as a motor (not shown). Further, a cutter 40 is provided between the first conveyors 38, 38 and the second conveyor 39.39 so as to be movable in the directions of arrows X and Y, and is held between the first conveyor 38.38 and the second conveyor 39.39. While moving in accordance with the speed of the advancing curved pipe 36, it is cut into transparent lengths.

FIG. 6 is an explanatory diagram illustrating the method for manufacturing a curved pipe according to the present invention, and shows the procedure for manufacturing a curved pipe using the curved pipe manufacturing apparatus 31 shown in FIG. That is, FIG. 6(a) shows the state immediately before starting the bent pipe manufacturing apparatus 31, with the stand 4 pivoting the core mold 32 on the fixed base 42.
1 shows a position in which the core mold 32 fixed to the adjuster 41 has turned to the left around the 0 point compared to FIG. Creel A.

It is located between B and C. To explain in detail, an auxiliary core mold 53, which will be shown next time (FIG. 6(b)), is attached to the end portion 32a via the fitting 54 shown in FIG. It is set at the start position of the winding of the roving 34 fed out from the roving bobbin 44 placed in the creels A, B, and C.

Next, FIG. 6(b) shows a state in which the roving formed on the auxiliary core mold 53 is introduced into the annular heater and subjected to a thermosetting treatment after the bent pipe forming apparatus 31 is started. The stand 41 is connected to the bent pipe manufacturing device 31 by a driving means (not shown).
At the same time as starting, the core mold 32 is turned to the right in the direction of the arrow from the position shown in FIG. The rovings are then wound and laminated on the auxiliary core mold 53 and subsequently on the core mold 32 while continuing to move to the annular heater 37. Here, FIG. 7 is an explanatory diagram illustrating the method for manufacturing a bent pipe according to the present invention. With reference to this figure, the procedure of winding and laminating around the auxiliary core mold 53 and the core mold 32 by the curved pipe forming device 31 will be explained. Rovings are fed out from rotary creels A and C (for convenience of explanation, each roving is labeled A for each creel).

(indicated with letters B and C) are wound around the auxiliary core mold 53 to form wound layers 55C and 55A.

At the same time, the roving 34B fed out from the fixed creel B is placed in the axial direction of the auxiliary core mold 53 and laminated 55.
Form B. By swinging the core mold 32 in the direction of the arrow, the winding 155c is formed.

55A and the laminated layer 55B are formed on the outer periphery of the auxiliary core mold 53, and following the auxiliary core mold 53, the wound layer and the laminated layer are formed around the circumference of the core mold 32. Then, the formed bent pipe 36 is impregnated with a curable resin liquid from the resin liquid spray 35. Now, returning to the original position and continuing to move as shown in FIG. 6(b), the starting part of the winding is inserted into the annular heater 37 by the swing of the core mold 32 and is subjected to a thermosetting process. Next, FIG. 6(C) shows that the curved tube 36 formed on the auxiliary core mold 53 that has entered the annular heater 37 has completed the heat curing process in the annular heater 37, and is further moved to the first position.
It is shown that the curved tube 36 has reached the conveyor 38138 and is in a position to be pulled out and conveyed along the outer circumference of the blood vessel, with the outer periphery being clamped by the conveyor rotating in the direction of the arrow. Therefore, the auxiliary core mold 53 connected to the core mold 32 by the fitting tool 54 is clamped by the first conveyor 38, 38 and receives a tensile force in the direction of the arrow. The stand 41 stops at the position shown in the figure, and the swing of the core mold 32 also stops). The auxiliary core mold 53 is conveyed through the first conveyor 38.38 with the curved tube 36 still attached to the windshield, and the auxiliary core mold 53 is conveyed through the first conveyor 38.38.
38 and the auxiliary core mold 53, the bent tube 36 begins to be pulled out from the core mold 32 (the position of the core mold 32 is not moved during the subsequent continuous manufacturing process). FIG. 6(d) shows a second conveyor rotating in the same direction and at the same speed as the first conveyor 38 while pulling out the auxiliary core mold 53 and bent tube 36 separated from the core mold 32 from the core mold 32. 39, 39
The figure shows the state in which it is being held and transported. The bent pipe 36 has already been pulled out from the core mold 32 for a considerable length together with the auxiliary core mold 53, and is continuously subjected to molding and thermosetting treatment on the core mold 32. Next, in FIG. 6(e), a part of the bent pipe 36 is cut by the cutter 40 at the position shown in FIG. 6(d) (correctly, moving little by little in the direction of the arrow). It shows the condition.

As shown in FIG. 7, the bent pipe 36 formed on the auxiliary core mold 53 is the beginning of the winding of the rotary creel C, so the winding layers or laminations are uneven, so it is removed from the auxiliary core mold 53 after cutting. Just dispose of it. The rotary saw blade type cutter 40 can move forward and backward in the directions of the above-mentioned arrows X and Y.
Immediately after cutting 6, the pipe is removed from the curved pipe conveyance path as shown in Fig. 6 (f).
Evacuate to position. Figure 6(f) is
) The bent pipe manufacturing device 31 that has finished starting up after the procedure is the bent pipe 3.
This shows the situation in which No. 6 is being continuously manufactured. The operating conditions of the cutter 40 can be set according to the required length or angle of the curved pipe 36, and the curved pipe 36 cut to a desired length by the cutter 40 is conveyed to the left by the second conveyor 39°39. be done. As described above, the bent pipe manufacturing apparatus 31 that has once started continuous manufacturing continues to manufacture bent pipes except when the rovings of the roving bobbins of creels A, B, and C are empty and the rovings are stopped for supply. is possible. If a space is provided in each of the creels to provide a spare bobbin for roving, continuous production of bent pipes over a considerable period of time becomes possible. In addition, when pulling out the curved pipe 36 from the core mold 32, if a core treatment is performed on the outer periphery of the core mold 32 to reduce frictional resistance immediately before the curved pipe forming part 33 so that the curved pipe 36 can be pulled out smoothly, it will be easier to pull it out. be.

Since the present invention is configured as described above, it is possible to continuously perform the molding and thermosetting treatment of the FRP curved pipe and the drawing of the curved pipe from the core mold in one process, thereby increasing production efficiency. This also made it possible to manufacture economically advantageous bent pipes.

[Brief explanation of the drawing]

0υ 55...Wound layer FIG. 1 is a schematic side view of a conventional FW forming machine, FIG. 2 is a schematic plan view thereof, and FIG. 3 is a schematic diagram of a bent pipe manufacturing apparatus used when carrying out the method of the present invention. Cross-sectional explanatory diagram, Figure 4 is IV of Figure 3
-] V-line cross-sectional view schematic explanatory diagram, Figure 5 is Y-Y in Figure 3
A schematic cross-sectional view and FIGS. 6 and 7 are explanatory diagrams illustrating the method for manufacturing a curved pipe according to the present invention. 31... Bent pipe manufacturing device 32... Core mold 3 for forming bent pipes
3... Bent tube forming part 34... Roving 35...
・Resin liquid spray 36...Bent pipe 37...Annular heater 38...First conveyor 39...Second conveyor
40...Cutter 41...Stand 42...
・Fixing base 43...Bottom member...Roving bobbin 45...Annular rack 46...Motor 47
... Drive shaft 48 ... Pinion 49 ... Frame member 50 ... Grooved guide roller 51 ...
Low pink guide hole 52... Roving guide pipe 53... Auxiliary core type 54... Fitting tool θQ Applicant: Kubota Iron Works Co., Ltd. Nippon Shokubai Chemical Industry Co., Ltd.

Claims (1)

[Claims] The roving is centripetally supplied from the outer periphery of the core mold to the outer peripheral surface of the core mold to wind the roving around the core mold, and the roving is impregnated with a thermosetting resin liquid to form the curved pipe. A method for manufacturing an FRP curved pipe, which comprises forming a curved pipe, continuously subjecting the curved pipe to a thermosetting treatment, and continuously drawing out the core shape.