JPH04301433A - Manufacture of t-shaped pipe joint made of fiber-reinforced resin - Google Patents

Abstract

PURPOSE:To manufacture efficiently a T-shaped pipe joint made of a fiber- reinforced resin by means of filament winding method. CONSTITUTION:A T-shaped mandrel 21 is assembled by fitting movably a previously prepd. short pipe 14 having a pipe-connecting part and made of a fiber- reinforced resin on an end part of a T-shaped base body. This mandrel 21 is rotated by using a main pipe part as a rotational shaft and a resin- impregnated reinforced fiber 24 is wound around the rotating mandrel 21 by means of a feed eye 22 having at least a function rotating and moving on a horizontal face including the rotational shaft of the mandrel and a function rotating around the unwinding direction of the resin-impregnated reinforcing fiber as a rotational shaft to form a fiber-reinforced resin layer. The fiber- reinforced resin layer and the short pipe 14 made of the fiber-reinforced resin are integrated and cured and then, the T-shaped based bodies 212 and 211 are released to obtain a T-shaped pipe joint 4 made of the fiber-reinforced resin.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a T-shaped pipe joint made of fiber reinforced resin.

0002

2. Description of the Related Art It is well known that the filament winding method (FW method) is used to manufacture fiber-reinforced resin tubes. If the pipe body is straight, it is relatively easy to apply the FW method, but when manufacturing a pipe body that is not straight, such as a cheese-type pipe joint, by the FW method, it is necessary to strengthen the resin impregnation especially in the branch pipe parts. It is difficult to wrap the fibers evenly.

[0003] Therefore, as a FW method that can precisely wind fibers around a branch pipe portion, for example, Japanese Patent Laid-Open No. 1-20094
In Publication No. 1, an axis for rotating a T-shaped mandrel consisting of a main pipe part and a branch pipe part around the main pipe part axis is set in a reference plane, and the T-shaped mandrel is rotated around the main pipe part axis. A cylindrical surface located at the axis of rotation in the reference plane and centered on the respective axes of the main pipe portion and branch pipe portions of the mandrel, and containing the main pipe portion and the branch pipe portions, respectively. Set a closed curved surface consisting of the above-mentioned mandrel, find a winding wire that can be wound on the above-mentioned mandrel under tension without causing the fiber to slip, divide this winding wire into many parts in advance, and divide the fiber to be wound into one division on the above-mentioned winding wire. Find the position (X1, Y1, Z1) of this point in the orthogonal coordinate system including the reference plane at the point where the winding intersects with the closed curved surface, position the feed eye here, and then Find the coordinates (X2, Y2, Z2) of the point where the tangent at the next dividing point intersects with the closed surface on the orthogonal coordinate system including a new reference plane obtained by rotating the reference plane by an arbitrary angle (θ), and is rotated by the above angle (θ), and the feed eye is rotated by the above coordinates (X2, Y2
, Z2) to wind the fiber, and then repeat the above operation for the next dividing point to make the FRP.
A method of forming a manufactured laminated T-tube is described.

That is, a method has been proposed for manufacturing a laminated FRP T-shaped tube by winding fibers around a mandrel by rotating a T-shaped mandrel and three-dimensionally moving a feed eye. According to this method, there is a degree of freedom in the rotation angle of the mandrel and the three-dimensional movement of the feed eye, so it is possible to wind fibers with high precision in branch pipe sections where errors are likely to occur.

[0005]

[Problems to be Solved by the Invention] However, the device used in the above method does not allow the feed eye to have a three-dimensional movement function, or controls the rotation of the mandrel and the three-dimensional movement of the feed eye using a computer. Since it requires additional equipment, it becomes a high-class machine and is expensive.

On the other hand, in order to efficiently wind resin-impregnated reinforcing fibers (hereinafter sometimes simply referred to as fibers) around a mandrel, it is preferable to wrap a large number of rovings in a tape-like manner.

However, in the above-mentioned winding by three-dimensional movement of the feed eye, the fibers drawn in a tape shape and fed out are bent at the feeding opening of the feed eye when being wound around the branch pipe portion. Therefore, depending on the bending angle of the fibers arranged in a tape shape, the tape width tends to be narrowed or the fibers tend to be twisted into strings. Therefore, in the fiber layer wound around the branch pipe, there are still areas where the fiber winding density increases, and conversely there are areas where the winding density is low, and there still remains the problem that it is not possible to wrap the fibers to a uniform thickness. Ta.

[0008] The present invention aims to efficiently utilize the above-described high-grade machine and to eliminate twisting of fibers wound around a mandrel in manufacturing a T-shaped pipe joint made of fiber-reinforced resin.

[0009]

[Means for Solving the Problems] The method for manufacturing a fiber-reinforced resin T-shaped pipe joint of the present invention provides a method for manufacturing a T-shaped pipe joint made of fiber-reinforced resin.
A method for manufacturing a fiber-reinforced resin T-shaped pipe joint by winding resin-impregnated reinforcing fibers around a character-shaped mandrel and curing the resin to form a fiber-reinforced resin layer, and then demolding the mandrel, the method comprising: , a fiber-reinforced resin short tube having a prefabricated tube connection portion is removably attached to the end of a T-shaped base, and the mandrel is rotated about the main tube portion as a rotation axis, and at least the mandrel is rotated. The feed eye, which has the function of rotating on a horizontal plane including a rotation axis and the function of rotating with the feeding direction of the resin-impregnated reinforcing fibers as the rotation axis, winds the resin-impregnated reinforcing fibers around the rotating mandrel to form a fiber-reinforced resin layer. By forming the fiber-reinforced resin layer, the fiber-reinforced resin layer is integrated with the fiber-reinforced resin short tube.

In this invention, the fibers used are not particularly limited, but include inorganic fibers such as glass fibers and carbon fibers, and organic fibers such as aramid fibers and polyethylene terephthalate fibers (PET fibers). Roving and cross tape made of these fibers (
For example, roving fibers woven in a grid pattern (the weaving method and width are not particularly limited) are preferably used. As the resin impregnated into the fibers, thermosetting resins such as unsaturated polyester resins and epoxy resins are preferably used.

[0011] The feed eye in this invention has at least the rotation function and rotation function described above, but in addition to these functions, it may also have a three-dimensional movement function as in the prior art described above. . Rather, it is preferable to have such a function. Note that all functions do not need to operate at the same time. Some of these functions may be operated in conjunction with each other depending on the position at which the fiber is wound around the mandrel. More specifically, this will be described later with reference to FIG.

In the present invention, there are no particular limitations on the method of manufacturing the fiber-reinforced resin short tube having the tube connection portion. For example, it may be manufactured by a hand lay-up molding method, a normal FW method, or the like. And the shape of the fiber reinforced resin short tube,
The structure and the shape and structure of the tube connection portion thereof are not particularly limited as long as they do not impair the function of the T-shaped mandrel when attached to the T-shaped base.

Further, the present invention will be specifically explained with reference to the drawings. FIG. 1 is an explanatory diagram showing the present invention in the order of its steps, in which the step (a) of manufacturing a fiber-reinforced resin short tube having a tube connection part, mounting the fiber-reinforced resin short tube on a T-shaped base; (b) assembling the T-shaped mandrel; (c) winding the resin-impregnated reinforcing fibers around the T-shaped mandrel; (d) heating and hardening the resin-impregnated reinforcing fiber layer wound around the mandrel; (d) removing the mandrel. The molding step (e) is shown. FIG. 2 is a perspective view illustrating the operation of the T-shaped mandrel and feed eye in the above step (c).

In these figures, reference numeral 1 denotes an apparatus for manufacturing a fiber-reinforced resin short tube, 14 a fiber-reinforced resin short tube having a pipe connection part, and 2 an apparatus for winding resin-impregnated reinforcing fibers 24 around a T-shaped mandrel 21. , 22 is a feed eye, 23 is a resin impregnating device, and 3 is a heating device.

First, in step (a), a short pipe 14 made of fiber-reinforced resin having a pipe connection part is manufactured. That is,
Using the feed eye 12, a resin-impregnated reinforcing fiber layer 13 made by impregnating a plurality of glass rovings with a thermosetting resin liquid is wound around a straight mandrel 11 to form a resin-impregnated reinforcing fiber layer, and after the resin is cured, it is removed. By molding, a fiber-reinforced resin short tube 14 is obtained. The outer surface shape of the mandrel 11 matches the inner surface shape of the tube connection section to be obtained, and the fiber reinforced resin short tube 14 has the tube connection section.

This manufacturing method is not particularly different from the conventional FW method, and usually involves the operation of rotating the mandrel 11 about its axis and the operation of reciprocating the feed eye 12 along the axis of the mandrel 11. As a result, the resin-impregnated reinforcing fibers 13 are wound around the straight mandrel 11. Note that the fiber-reinforced resin short tube 14 may be manufactured by a hand lay-up method or the like instead of the FW method. In addition to thermosetting resins, photocurable resins can be used as resins for producing short tube fibers.

The fiber-reinforced resin short tubes 14 thus manufactured are removably attached to the ends of the main tube portion 211 and branch tube portions 212 of the T-shaped base, and the T-shaped mandrel 21 is assembled (b). .

This mandrel 21 is attached to a mandrel rotating device (not shown) and rotated using the axis of the main pipe portion of the mandrel 21 as the rotation axis. In addition, as shown in FIG. 2, the feed eye 22 has a three-dimensional movement operation: a movement operation in the X-axis direction along the axis of the mandrel 21, a movement operation in the Z-axis direction toward and away from the mandrel 21, and a movement operation in the Y-axis direction in the vertical direction. Original movement, rotational movement indicated by V, and rotational movement indicated by U are allowed. The resin-impregnated reinforcing fiber 24 is made by aligning a large number of glass rovings and is passed through the resin-impregnating device 2.
3, is fed out from the feed eye 22, and wound around the rotating mandrel 21 to form a resin-impregnated reinforcing fiber layer (c).

The operation of the feed eye 22 in this case will be further explained with reference to FIG. 2 and FIG. 3 which schematically shows the mandrel 21. For convenience,
The main pipe part and the branch pipe part of the mandrel are the main pipe part of the T-shaped base,
The same reference numerals (211 and 212, respectively) as for the branch pipe parts will be used.

First, as shown in FIG. 3(a), when winding the fiber 24 around the main pipe portion 211 of the mandrel 21, the feed eye 22 is moved in the X-axis direction along the axial direction of the rotation axis of the mandrel 21. It is operated by actuation and a rotational movement indicated by V. This rotational movement of the feed eye 22 adjusts the feeding direction of the aligned fibers 24 and cross roving at an appropriate angle, especially when aligning multiple fibers in the width direction and winding them into a tape shape or when winding a cross roving. By doing so, the width can be maintained.

Next, as shown in FIG. 3(b), the fiber 2
4 begins to move from the main pipe section 211 to the branch pipe section 212, the feed eye 22 moves the mandrel 21 on the horizontal plane including the movement operation in the X-axis direction and the rotation axis of the mandrel 21.
It is operated by a movement operation in the Z direction toward and away from the fiber 24, and a rotation operation with the rotation axis being the direction in which the fibers 24 are fed out. Here, the rotational action indicated by U prevents the fibers 24 from twisting.

[0022] Thereafter, when the fibers are wound around the branch pipe portion, in addition to the above three operations, rotational movement and vertical movement in the Y direction are added. In other words, all five operations of the feed eye 22 are activated (FIG. 3(c)).
.

By sequentially performing these operations, a resin-impregnated reinforcing fiber layer of a predetermined thickness is formed on the mandrel 21. Subsequently, the resin-impregnated reinforcing fiber layer formed on the outer peripheral surface of the mandrel 21 is transported together with the mandrel to a heating furnace,
Heat and cure using heater 3 (d).

After curing, each short pipe 14 is first removed, and then the branch pipe section 212 and main pipe section 211 of the mandrel 21 are removed.
are demolded in this order to obtain a fiber-reinforced resin T-shaped pipe joint 4. In addition, if the operation in step (c) above is programmed and the operation of the feed eye 22 and the rotation operation of the mandrel 21 are controlled by a computer, high precision can be achieved.
This is preferable because it improves efficiency.

[0025]

[Operation] As described above, in this invention, a short pipe made of fiber-reinforced resin having a pipe connection part is made in advance, and this is removably attached to a T-shaped base to form a T-shaped mandrel, and this is impregnated with resin. A fiber reinforced resin layer is formed by winding reinforcing fibers. Therefore, the part where the resin-impregnated reinforcing fibers are wound is mainly the confluence part of the branch pipe part and the main pipe part of the T-shaped mandrel; The amount of work needed to wrap the resin-impregnated reinforcing fibers is gradually reduced.

In addition, when winding the resin-impregnated reinforcing fibers around the T-shaped mandrel, by rotating the feed eyes, the direction of the feed eyes can be aligned in the direction in which the resin-impregnated reinforcing fibers are sent out. It can be wrapped around a mandrel without narrowing the width of the fibers or the width of the cross roving. and,
By rotating the feed eye, twisting of the resin-impregnated reinforcing fibers during winding around the mandrel is prevented.

[0027]

[Embodiments] Examples of the present invention will be described below. First of all,
As shown in FIG. 1(a), a short pipe 14 made of fiber-reinforced resin having a pipe connection part was manufactured by a normal FW method. The reinforcing fiber at this time is glass fiber roving (count 2220g
/km), and the resin liquid is bisphenol A epoxy resin (LY-556: manufactured by Nippon Ciba Geigy).
An alicyclic acid anhydride curing agent (HY-917: manufactured by Nippon Ciba Geigy) and a curing accelerator (DY-070: manufactured by Nippon Ciba Geigy) was used.

The thickness of this short tube 14 is 5 mm, and the inner diameter is 165 mm.
mm, length 300 mm, and had a groove on the inner surface of the pipe connection part into which a sealing rubber ring could be attached. Next, the mandrel 21 was assembled by removably attaching the short tubes 14 to the ends of the main tube section 211 and the branch tube section 212 of the T-shaped base. In this mandrel 21,
The length of the main pipe portion was 700 mm, and the inner diameter was 166 mm.

Next, using the apparatus 2 shown in FIG.
0 fibers were aligned and passed through a resin impregnation tank 23 to form resin-impregnated fibers 24. The resin liquid in the resin impregnation tank 23 was the same as that used in manufacturing the short tube 14 described above.

[0030] This resin-impregnated fiber 24 is wound around the mandrel 21 by the operation of the feed eye 22 as described above, and is wound helically to a thickness of 10 mm mainly at the confluence of the main pipe section and the branch pipe section. After heating and curing this in a curing furnace at 130°C for 2 hours to integrate it with the short pipe 14, the branch pipe part 212 and main pipe part 211 of the T-shaped base are removed in this order to form a cheese-shaped pipe joint. I got it.

[0031] The time required for winding the resin-impregnated fibers 24 in this step was reduced to about 1/2 compared to the case where the fiber-reinforced resin short tube 14 was not used. Furthermore, the thickness of the main pipe portion and branch pipe portion of the obtained cheese-type pipe joint was 5.5 mm.
The thickness of the joint between the main pipe and the branch pipe was 11.5±1 mm, and had sufficient strength without breaking under water pressure of 40 kg/cm2.

[0032]

[Effects of the Invention] As described above, the pre-manufactured fiber-reinforced resin short pipes can be manufactured using a manufacturing method and inexpensive equipment suitable for the shape and structure of the pipe connection portion. In addition, when winding the resin-impregnated reinforcing fibers around the T-shaped mandrel, only the confluence of the branch pipe section and the straight pipe section of the T-shaped mandrel is required, which reduces the amount of work required for winding the resin-impregnated reinforcing fibers. Machine operating time can be shortened. Therefore, overall productivity can be improved and manufacturing costs can be reduced.

[0033] Further, due to the rotating and rotating functions of the feed eye, the resin-impregnated reinforcing fiber can be wound around the mandrel without narrowing or twisting. Therefore, the resin-impregnated reinforcing fibers are uniformly laminated on the mandrel, and a high-strength fiber-reinforced resin T-shaped pipe joint can be manufactured.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the manufacturing method of a fiber-reinforced resin T-shaped pipe joint of the present invention in order of steps.

FIG. 2 is a perspective view illustrating the operation of the main parts in FIG. 1;

FIG. 3 is an explanatory diagram schematically showing a case where resin-impregnated reinforcing fibers are wound around a T-shaped mandrel.

[Explanation of symbols]

11 Straight tubular mandrel 14 Fiber reinforced resin short tube 21 T-shaped mandrel 211 Main pipe section 212 Branch pipe section 22 Feed Eye 23 Resin impregnation equipment 24 Resin-impregnated reinforced fiber 3 Heater 4 Fiber reinforced resin T-shaped pipe fitting

Claims (1)

[Claims] Claim 1: After winding resin-impregnated reinforcing fibers around a T-shaped mandrel consisting of a main pipe part and a branch pipe part, and curing the resin to form a fiber-reinforced resin layer, the mandrel is removed from the mold to form a T-shaped mandrel made of fiber-reinforced resin. A method for manufacturing a tube joint, the mandrel being configured by removably attaching a fiber-reinforced resin short tube having a prefabricated tube connection portion to an end of a T-shaped base; The mandrel is rotated around the main pipe part as the rotation axis, and the feed eye has the function of rotating at least on a horizontal plane including the rotation axis of the mandrel and the function of rotating around the feeding direction of the resin-impregnated reinforcing fibers as the rotation axis. A fiber-reinforced resin T-shaped pipe joint characterized in that the fiber-reinforced resin layer is integrated with the fiber-reinforced resin short pipe by winding fibers around the rotating mandrel to form a fiber-reinforced resin layer. Production method.