JPH0441044B2 - - Google Patents

Description

[Detailed description of the invention] The present invention has excellent workability and productivity, and can easily meet the demands for large molded products.
This article relates to a method for forming FRP bent pipes.

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, 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 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 by arranging rovings with high tensile strength continuously around the surface of a core mold for curved pipe forming so as to receive stress in the tensile direction, mechanical It is possible to form curved pipes with extremely high strength. That is,
The case of forming a bent 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 with a rotary roving adjustment/supply device. 3 is arranged so as to be rotatable around a non-rotating core mold for curved pipe forming (hereinafter simply referred to as "core mold") 2. That is, a core mold 2 is disposed approximately above the center of a turntable 5 that is pivotally supported at the center of a flat plate bearing 4, and the top surface of the core mold 2 is connected to a driver 7 via an L-shaped arm 6. By doing so, the core mold 2 is rotated about the fulcrum P in the direction of the up and down arrow X. On the other hand, near the outer periphery of the turntable 5, there is a roving head made up of a roving unit support hollow base 9, which is made up of a plurality of roving units 8, and a roving head 10, which are set in substantially symmetrical positions about the pivot point. A support 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 head 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 passed through the roving head support hollow table 11 and the roving head 10 to the roving head 10. head 10
The yarn is continuously supplied in two directions to the core mold from the yarn guiding member 13 at the tip. 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 to it, and as the winding progresses, 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, since the core mold 2 does not rotate and maintains a substantially fixed position, the resin between the rovings wound around the surface of the core mold 2 drips down due to its own weight, so-called resin dripping. As a result, the wall thickness of the molded product becomes uneven, and the resin falls onto the upper surface of the resin bath 12 and turntable 5 and hardens, which significantly deteriorates the appearance of the molding machine. Further, the adhered and hardened resin had to be removed manually, which made workability difficult.

When using a hardening furnace, the position of the hardening furnace may be, for example, placed between the drive unit 7 and the turntable 5.
It is necessary to install the core mold 2 in the opposite direction (upper side in Figure 2) and rotate it about half a turn so as not to hit the roving adjustment/supply device 3.
As a result, it takes a long time to set up the curing furnace, and it is difficult to expect much improvement in productivity. Furthermore, since the structure of the driving machine 7 must be complicated, there is a possibility that the cost of the device will increase significantly.

If the dimensions of the curved pipe to be formed become larger, the forming machine must also be made proportionally larger.
The economical efficiency of the equipment becomes extremely poor, and the product cost is greatly affected.

Concerned about the above circumstances, the inventors of the present invention have worked diligently to provide a method for forming curved pipes that has excellent workability and productivity, improves equipment economy, and can easily respond to requests for large molded products. The present invention was completed through research, and the forming method of the present invention involves rotating the core mold around an imaginary axis that connects the centers of both end surfaces, and changing the supply length of the roving up and down. The thread guiding member is traversely moved along an axis parallel to the imaginary axis;
The gist is that the roving is wound around the core mold so that the angle between the feeding direction of the roving and the bending axis of the rotary core mold is always a constant angle.

The configuration and effects of the present invention will be explained below based on the drawings, but the following is a representative example and is not intended to limit the present invention.
Of course, it is also possible to make appropriate changes and implementations within the scope of the spirit described above and below.

FIG. 3 is a schematic perspective view showing an example of an implementation apparatus to which the method of the present invention is applied, and in this figure, a molding machine 31 has a rotary core mold 32 and a roving adjustment/supply device 33 arranged side by side, A curing furnace 34 is arranged below the core mold 32. Note that the curing furnace may be provided at another location. That is, the core mold 32 has shafts 35a and 35b that are approximately centered on both end surfaces thereof, and these shafts 35a and 35b are connected to the bearings 3, respectively.
6a and 36b, and by further extending the end of the shaft 35a, a continuously variable speed motor (hereinafter referred to as motor) 3 is constructed.
It is connected to the output shaft of 7. Furthermore, the motor 37 and bearings 36a and 36b are connected to hydraulic lifting devices 38a and 38.
It is arranged so that it can be raised and lowered integrally by means of b, so that the height of the machine can be adjusted. 39 is a hydraulic unit. Reference numeral 40 indicates an angular velocity detection section of the shaft 35a, which is electrically connected to a control circuit section 45d of a roving head controller 45a, which will be described later.

In addition, the roving adjustment/supply device 33 arranges a rail 41 and a beam member 42 of the same length in parallel, and fixes both ends of these in a rectangular shape with gripping members 43a and 43b. It is arranged so that it can be raised and lowered integrally by means of lift devices 44a, 44b, 44c, and 44d, so that the height of the machine can be adjusted. Further, a roving head 45 is provided on the rail 41 and the beam member 42 so as to straddle them. That is, a roving head controller (hereinafter simply referred to as "head controller") 45a is fixedly attached to the beam member 42, and a thread guiding member base 45b is slidably held with respect to the rail 41.
is connected to a head controller 45a via a telescopic arm 45c which will be described later. That is, the head controller 45a is positioned and fixed to the beam member 42 in relation to the center position of the core mold 32, and the movable arm 45c is moved by a drive machine built into the head controller 45a and not shown in the figure.
The thread guiding member base 45b fixed to the tip of the movable arm 45c is moved to the rail 4 by swinging while expanding and contracting.
1 so that it can slide freely. For example, FIG. 9 shows an example of this, and the movable arm 45c is constructed by pivotally supporting two vertically bent bars 45c1 and 45c2. The bracket 45r pivotally supported by the swing drive device 45t swings in the horizontal direction as shown in Figure b, and the length of the movable arm 45c is adjusted to the bar 45c1,
The thread guide member base 45b is slid along the rail 41 while expanding and contracting by changing the bending angle of the thread guide member 45c2. The head controller 45a can also be installed directly on the floor, especially when the molding machine 31 is relatively large, or when the thread guiding member 4 is installed as described later.
When performing multi-axis control of 5e, a floor-mounted configuration is preferable. Reference numeral 45d is a control circuit section of the head controller 45a. Further, a thread guide member 45e is mounted on the thread guide member base 45b via a movable arm 45c so as to be swingable. If this part is configured as shown in FIG. 8, for example, and the thread guiding member 45e is formed into a ring shape,
Even if the thread guiding member 45e is not swingable,
The rovings slide along the inner surface of the ring in the circumferential direction and are fed out in any direction while remaining parallel to each other.

On the other hand, from both ends of the movable arm 45c in the width direction, groove rails 46a and 46b are extended directly downward as shown in FIG.
Each weight 48a is made to protrude from inside each groove of b,
By attaching 48b, a so-called dancer function is provided. Therefore, even if the distance between the core 32 and the yarn guiding member 45e changes due to the rotation of the core 32 in the direction of arrow A, a predetermined tension can always be applied to the roving 49 running between them. . In addition, when the structure as shown in FIG. 8 is adopted, it can also be designed so that it is suspended below the thread leading-out member 45e on the ring. Furthermore, 49 is a loathing impregnated with resin liquid in a resin bath (not shown in the figure), which passes through the head controller 45a or other suitable guide rolls, passes under the tension roll 47, and is further threaded out. Member 45e
It is arranged so that it can be supplied to the core mold 32 through the process.

When supplying the roving 49, the control circuit section 4
5d, the thread guide member base 45b is caused to perform a variable speed traverse movement along the rail 41 via the movable arm 45c, and the thread guide member 45e is oscillated (in the case of a ring shape, it is oscillated as described above). ), and then adjust the feeding direction of the roving 49 to the core mold 32 and the core mold 3.
The angle formed by the bending axis of 2 is the roving 49
Always constant from the start of winding to the end of winding (almost perpendicular)
The roving 49 can be spirally wound onto the core mold 32. The control circuit section 45d may have various configurations; for example, it may include an input section for receiving an angular velocity signal from the angular velocity detection section 40, an arithmetic section for changing a temporal angular velocity change into a uniaxial linear velocity change, and an arithmetic operation section. and an output section for transmitting the generated linear velocity signal to a driving machine for swinging the movable arm 45c.

The manner in which the roving 49 is wound around the core mold 32 by the forming machine 31 configured in this way is shown in the fifth section.
(Schematic side view of main parts in Figure 3) and Figure 6 (Schematic side view of main parts in Figure 3)
The main parts are as shown in the schematic plan view of the main part of the figure, and will be explained below with reference to these. 50 in Figure 3
51 is a tip roll built into the yarn guiding member 45e, and 51 is an intermediate roll built into the head controller 45a. If the core mold 32 is rotated in the direction of arrow A in FIG.
D)
becomes. By the way, as the core mold 32 moves from position (A) to (C), the distance between the core mold 32 and the tip roll 50 becomes shorter, so if no countermeasure is taken, the roving 49 between them will become slack. may occur and the tension may disappear. However, in the present invention, as is clear from the above structure, the slack is absorbed by the lowering of the tension roll 47, and at the same time, a predetermined tension is constantly applied to the roving 49, so that the mechanical strength of the molded product does not decrease. We take into consideration the following.

Also, due to the rotation of the core mold 32, its planar shape changes to the sixth shape.
As shown in the figure, since the shape changes between the solid line shape and the broken line shape at regular intervals, if the movable arm 45c and the tip roll 50 are fixed to the core mold 32, the winding around the entire core mold 32 is possible. However, as described above, the tip roll 50 can reciprocate at non-uniform speed along the rail 41 via the movable arm 45c, and the tip roll 50 is configured to be able to swing freely, and the roving 49 Since the rovings 49 can be supplied while making a traverse motion so that the supply direction (direction of arrow R) is always perpendicular to the bending axis direction of the core 32, continuous winding around the core 32 is possible. .

The traverse motion of the roving 49 is such that its winding is directed from the core end 32a to the arrow B as shown in FIG.
When heading in the direction, the direction approaches the rail position E corresponding to the center point of the core 32 while performing inconstant reciprocating motion in the directions of arrows D and D', and the winding starts from the center of the core 32 in the direction of arrow C. When moving toward , it moves away from E toward the right in the drawing while performing inconstant reciprocating motion in the directions of arrows F and F'.

In this way, while rotating the core mold 32, the core mold 32 is held in a state where appropriate tension is applied to the roving 49.
It became possible to wrap the wire continuously. Therefore, resin dripping, which has been a problem with conventional non-rotating core types, does not occur, and there is no need to remove adhered and hardened resin. In addition, when curing the molded product after the roving has been wrapped, the molded product is transferred to the roving adjustment/supply device 33 as shown in FIG.
Since the core mold 32 can be easily stored in the curing furnace 34 installed below the core mold 32 by simply operating the lifting device 38, no special storage device is required and the working time is reduced. You can expect an improvement in productivity as the time becomes shorter. Furthermore, as is clear from the figure, even if the core mold 32 becomes larger, that is, even if the curved pipe to be formed becomes larger, the roving adjustment/supply device 33 itself does not need to be particularly large, and the shafts 35a, 35b and Since this can be done by simply adjusting the spacing and height of the spacer, the economic efficiency of the device is very good, and it can also contribute to reducing product costs.

By the way, the thread guiding member 45e, that is, the tip roll 50
As shown in FIG. 7, the directions are horizontal (X-X axis direction) and front-rear direction (Y-Y axis direction) with respect to the core mold 32, respectively.
and in the vertical direction (Z-Z axis direction), and in the above embodiment, automatic traverse control is performed by the movement guide controller 45a in the X-X axis direction, and movement in the Y-Y axis direction is performed by the tension roll 4.
This is done by automatic tension loading action according to 7. Furthermore, if necessary, movement in the Z-Z axis direction can be performed by the free swinging action of the tip roll 50, but
- In addition to X-axis movement, Y-Y-axis movement or/and Z-
It is also possible to configure the Z-axis movement to be performed by the head cotton roller 45a. However, it goes without saying that the calculation section in the control circuit section 45d in this case needs to be constructed of a so-called multi-axis control circuit, which is a circuit that can convert changes in angular velocity over time into changes in two-axis linear velocity and/or three-axis linear velocity changes. . According to such a multi-axis motion control method, the molding operation can be performed more quickly and accurately than the method in which only one axis is controlled by the head controller 45a as described above. , further effects in terms of productivity and quality can be expected.

In the above embodiment, the procedure for forming horizontal stripes was mainly explained, but the formation of vertical stripes may be performed by conventional general means.For example, in FIG. Roving mats 49
After being arranged continuously or intermittently so as to intersect with
All you have to do is wrap it around.

Since the present invention is configured as described above, workability,
We were able to create a method for molding FRP bent pipes that has excellent productivity, improves equipment economy, and can easily meet requests for large molded products.

[Brief explanation of drawings]

Figure 1 is a schematic side view of a conventional FM molding machine, Figure 2
The figure is a schematic plan view of the same, FIG. 3 is a schematic perspective view of a FW forming machine for carrying out the method of the present invention, and FIG. 4 is a detailed explanatory view of the tension roll attachment part of FIG. 3.
Figure 5 is a schematic side view of the main part of Figure 3, and Figure 6 is a side view of the main part of Figure 3.
Fig. 7 is an explanatory diagram of the movement state of the roving head, Fig. 8 is an explanatory diagram showing a modified example of the thread guiding member, and Fig. 9 a is a side view showing an example of the movable arm 45c. , b is a plan view of a. 31... Molding machine, 32... Core mold, 33... Roving adjustment/supply device, 34... Hardening furnace, 37...
...Motor, 38, 44a to 44d... Lifting device,
45... Roving head, 45a... Roving head controller, 45c... Arm, 45
d... Control circuit section, 45e... Yarn lead-out member, 47
...Tension roll, 49...Roving, 5
0...Tip roll, 51...Intermediate roll.

Claims (1)

[Claims] 1 In a method of forming an FRP bent pipe by continuously winding the roving supplied through the thread guide member at the tip of the roving head around a core mold for forming a curved pipe, an imaginary line connecting the core mold approximately at the center of both end faces thereof The roving is rotated around an axis, and the supply length of the roving can be changed and adjusted by a vertically movable tension roller, and the yarn guiding member is traversed along an axis parallel to the virtual axis. A method for forming an FRP bent pipe, characterized in that the roving is wound around the core mold so that the angle between the supply direction of the roving and the bending axis of the rotary core mold is always a constant angle.