JP3375376B2 - Manufacturing method of fiber reinforced resin pipe joint - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a T-shaped fiber reinforced resin pipe joint. [0002] Hitherto, it has been well known that a filament winding (FW) method is used for producing a fiber reinforced resin pipe joint. If the tube is straight, it is relatively easy to apply the FW method. However, when a non-linear pipe body such as a T-shaped pipe joint is manufactured by the FW method, the curable resin-impregnated reinforcing fiber is uniformly wound around the intersection of the branch pipe part and the main pipe part, in particular. It is not easy to obtain a fiber reinforced resin pipe joint having pressure resistance. Therefore, for example, a so-called hand-up molding method of manually laminating a curable resin-impregnated reinforcing fiber on a T-shaped mandrel is generally employed. Further, as described in JP-A-1200939-200941, a T-shaped tube mandrel including a main pipe portion and a branch pipe portion is rotated around a rotation axis in a reference plane, and a feed eye is rotated. There has been proposed a method of forming a laminated T-tube made of fiber reinforced resin by an operation of moving the feed eye one-dimensionally, two-dimensionally, or three-dimensionally within a plane of movement. [0004] However, in the hand-lay-up molding method, since the laminating operation is performed manually, the molding time becomes longer, the productivity is lower, and the cost is higher. Also, there is a problem that the stability and reliability of the molded product are low because there is variation due to individual differences. Also, Japanese Patent Application Laid-Open No.
In the method described in Japanese Patent Application Laid-Open No. 9-200941, even if the rotation of the T-tube mandrel is computer-controlled and operated by a program, the operation is complicated, so that the molding speed cannot be increased. There is a problem that the winding angle around two axes including the axis is restricted, and it is not easy to mold a high-strength fiber-reinforced resin pipe joint. The present invention solves the above-mentioned conventional problems and provides a method of manufacturing a high-strength, high-precision T-shaped fiber reinforced resin pipe joint with high productivity and at low cost. It is done for the purpose of. SUMMARY OF THE INVENTION The present invention relates to a method for winding a T-shaped mandrel with a curable resin-impregnated reinforcing fiber, curing the resin to form a fiber-reinforced resin layer, and then removing the T-shaped mandrel. A method of manufacturing a fiber reinforced resin pipe joint by molding , wherein a T-shaped mandrel is formed by blow molding.
Protrudes in the center at right angles to the axial direction
Branch pipe part of main pipe part formation part provided with branch pipe part formation part connection part
From the molded product formed by blow molding to the forming part connection part
Opening provided the base end of the branch pipe portion forming portion comprising at its end
The structure is made detachable by fitting the parts ,
First, the assembled T-shaped mandrel is rotated about the main pipe forming section as a rotation axis to form a branch pipe from the main pipe forming section.
The curable resin-impregnated reinforcing fibers are wound around the intersection with the part , and then the curable resin-impregnated reinforcing fibers are wound around the branch pipe part by rotating the branch pipe part around the rotation axis. After the resin is cured to form a fiber reinforced resin layer , first, the T-shaped mandrel is crushed to form the branch pipe portion.
And then crush the main pipe formation
This is a method for producing a fiber reinforced resin pipe joint which is released in a smooth manner. In the present invention, the fibers used include:
Although not particularly limited, examples thereof include inorganic fibers such as glass fiber and carbon fiber, and organic fibers such as aramid fiber and polyethylene terephthalate fiber (PET fiber). The fibers are woven in a cross-girder shape, and the weaving method and width are not particularly limited. The curable resin-impregnated fiber is obtained by impregnating the above-mentioned reinforcing fiber with a curable resin, and it is preferable that 50 to 200 parts by weight of the curable resin is impregnated with respect to 100 parts by weight of the reinforcing fiber. As the curable resin, conventionally known thermosetting resins and photocurable resins are used, and unsaturated polyester resins and epoxy resins which are thermosetting resins are preferably used. In the method for producing a fiber reinforced resin pipe joint of the present invention, a T-shaped mandrel is formed by blow molding.
Projected in the center at right angles to the axial direction
Branch of the main pipe forming part provided with the branch pipe forming part connecting part
Molded product formed by blow molding at the tube forming section connection
The base end portion of the branch pipe portion forming part consisting provided at the end
Openings to removably and structure and without to fit a first, a T-shaped mandrel assembled, the branch pipe part from the main pipe section forming section a main portion forming portion is rotated as a rotation axis
The curable resin-impregnated reinforcing fiber is wound around the intersection with the forming portion, and then the curable resin-impregnated reinforcing fiber is wound around the branch tube forming portion by rotating the branch tube forming portion around the rotation axis. After hardening the resin to form a fiber reinforced resin layer , first, crush the branch pipe forming portion of the T-shaped mandrel.
Remove the mold as before, then push the main pipe forming part
By crushing and removing the mold, the winding angle of the curable resin-impregnated reinforcing fiber around the main pipe section and the branch pipe section is not restricted, and the T-shape has high strength and high accuracy. Pipe fittings can be manufactured. Further, when winding the curable resin-impregnated reinforcing fiber, it is not necessary to rotate the mandrel in a complicated manner, so that a T-shaped pipe joint can be manufactured with good productivity and at low cost. Embodiments of the present invention will be specifically described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the operation of the feed eye used in the present invention. Feed Eye 2
The three-dimensional movement operation includes a movement operation in the X-axis direction along the axis of the T-shaped mandrel 1, a movement operation in the Z-axis direction approaching / separating from the T-shaped mandrel 1, and a movement operation in the Y-axis direction in the vertical direction. , A rotation operation indicated by V which rotates on a horizontal plane including the rotation axis of the T-shaped mandrel 1 and a rotation operation indicated by U which rotates with the feeding direction of the curable resin-impregnated reinforcing fiber as the rotation axis are enabled. ing. FIG. 2 is a front view showing a T-shaped mandrel 1 used in the present invention. The T-shaped mandrel 1 includes a main pipe forming section 11 and a branch pipe forming section 12. The main pipe section forming section 11 is a molded article formed by blow molding using polyethylene or the like, is a linear hollow body, and has pipe connection section forming sections 111 at both ends. On the outer peripheral surface, a plurality of ridges are formed along the circumferential direction for forming a groove for mounting the packing on the inner peripheral surface of the pipe connection portion. The tip is a sealed head 112.
In the center of the main pipe section forming section 11, a branch pipe section forming section connecting section 1 that protrudes slightly in the lateral direction perpendicular to the axial direction thereof.
13 are provided. Incidentally, the main tube forming portion 11 is not limited to the above-mentioned structure. For example, the main tube forming portion 11 is divided into two parts on the left and right at a substantially central part, and the two parts are bonded with a hot-melt adhesive or in the axial direction. It is good also as a structure which relatively moves and fits. In addition, it is preferable that resin-impregnated reinforced short fibers are previously applied by means of a hat-re-up molding and naturally cured at room temperature in order to improve the strength around the central portion of the main pipe portion forming portion 11. The branch pipe forming section 12 is a molded article formed by blow molding using polyethylene or the like, is a linear hollow body, and is provided with a pipe connecting section forming section 121 at the tip. On the outer peripheral surface, a plurality of ridges are formed along the circumferential direction for forming a groove for mounting the packing on the inner peripheral surface of the pipe connection portion. The tip is a closed head 122. An opening 123 is provided at the end of the base end. And the connecting part 1 of the main pipe part forming part 11
The T-shaped mandrel 1 is formed by mounting the branch tube forming portion 12 to the main tube forming portion 11 so that the opening 123 is fitted to the opening 13. At this time, it is preferable that the outer peripheral surface of the connection portion 113 and the inner peripheral surface of the opening portion 123 be appropriately bonded with a hot melt adhesive or the like, so that the both are firmly fixed. The main pipe forming section 11 of the branch pipe forming section 12
The manner of attachment to the branch is not limited to the above case, and a structure may be adopted in which the two are fitted to each other as appropriate so that the branch pipe forming part 12 can be removed in the axial direction when the mold is removed. FIG. 3 is a front view showing the rotating machine 3 used in the present invention. The rotating machine 3 includes a drive-side chuck 31, a support-side chuck 32, and a branch tube core pushing unit 33. The drive-side chuck 31 is drivably connected to a motor shaft in the motor box 34. The drive-side chuck 31 has a main tube forming portion 11 of the T-shaped mandrel 1.
Head 12 at one end and head 12 at branch tube forming portion 12
2, a concave portion 311 corresponding to the outer surface shape of the concave portion 3 is provided.
A fine hole is provided on the inner surface of 11 so that vacuum suction can be performed through the fine hole. A plurality of pins 312 are provided in a row on the outer periphery of the drive-side chuck 31 at predetermined intervals along the circumferential direction. When the curable resin-impregnated reinforcing fiber is wound by helical winding,
Used to improve the accuracy of the winding angle without slipping the fiber. The main-tube forming section 1 is also provided on the support-side chuck 32.
The concave portion 32 corresponding to the outer surface shape of the head 112 at the other end of 1
1 and a pin 322 similar to the above. The branch pipe core pressing section 33 is provided with a pressing section 331 at its tip which abuts and presses against a portion opposite to the portion where the branch pipe forming section at the center of the T-shaped mandrel 1 is mounted. The pressing portion 331 can be pushed and retracted by a cylinder 332. The axis 323 of the support side chuck 32 and the axis 333 of the branch pipe core pushing portion 33 are formed so that the axial direction thereof forms a 90 ° angle. 351. Then, the rotating member 351
The support-side chuck 32 is rotatable between a position on the axis of the drive-side chuck 31 and a position at 90 ° from the axis. Next, by rotating the rotation member 351, the support side chuck 32 is rotated from a position on the axis of the drive side chuck 31 to a position at 90 ° with respect to the axis. This will be described with reference to FIGS. First, as shown in FIG.
1, a head 112 at one end of the main tube forming portion 11 is fixed by vacuum suction, and a head 112 at the other end of the main tube forming portion 11 is fixed to the support side chuck 32 by vacuum suction. The pressing portion 331 of the core pressing portion 33 is in a retracted state.
In this state, rotation around the main tube forming unit 11 as a rotation axis is possible. As shown in FIG. 5, while the head 112 at the other end of the main tube forming portion 11 is fixed to the support side chuck 32 by vacuum suction, the pressing portion 331 of the branch tube core pressing portion 33 is held.
Is brought into contact with a portion of the center of the T-shaped mandrel 1 opposite to the portion where the branch tube forming portion 12 is mounted, and the head 112 at one end of the main tube forming portion 11 is removed from the driving side chuck 31. . Further, as shown in FIG.
2 is rotated by 90 ° from the axis of the drive-side chuck 31 and the branch pipe core pushing portion 33 is positioned on the axis of the drive-side chuck 31. After the head 122 of the part 12 is fixed by vacuum suction, the head 112 at the other end of the main pipe part forming part 11 is removed from the support-side chuck 32. In this state, the branch pipe forming section 12
Can be rotated about the rotation axis. In order to return from the rotation using the branch pipe forming section 12 as the rotation axis to the rotation using the main pipe forming section 11 as the rotation axis, the above operation is performed in a completely opposite manner. An embodiment for manufacturing the fiber reinforced resin pipe joint of the present invention will be described below with reference to FIGS. As a first step, as shown in FIG. 7, the main pipe forming section 11 of the T-shaped mandrel 1 is rotated around a rotation axis, and the curable resin-impregnated reinforcing fibers are wound around the main pipe forming section 11. First, as shown in FIG. 7 (a), the head 112 at one end of the main tube forming portion 11 of the T-shaped mandrel 1 is fixed to the drive-side chuck 31, and the head 112 at the other end is supported. It is fixed to the side chuck 32. Then, if necessary, a resin-impregnated glass mat and a cloth for forming a reinforcing layer are wound around a substantially central portion of the main pipe portion forming portion 11 and cured. Further, the pipe connecting portion forming portions 1 at both ends of the main pipe portion forming portion 11.
A resin-impregnated nonwoven fabric for weeping prevention is wound around 11. Next, as shown in FIG. 7 (b), the shaft of the rotating machine 3 is rotated to rotate the main pipe forming section 11 as a rotation axis, and heat is applied to a plurality of glass rovings using the feed eye 2. The curable resin-impregnated reinforcing fiber 4 impregnated with the curable resin liquid is wound around the intersection from the pipe connection part forming part 111 of the main pipe part forming part 11 with the branch pipe part forming part 12. At this time, first, as shown in FIG. 7 (b), it is wound with a hoop winding, and then, as shown in FIG. 7 (c),
Wrap with helical winding and, if necessary, again with hoop winding. As shown in FIG. 7B, when winding by hoop winding, the winding is performed between the pin 312 of the drive side chuck 31 and the pin 322 of the support side chuck 32. At the same time, the drive side chuck 31
Between the pin 312 and the proximal end of the branch pipe forming section 12, and between the proximal end of the branch pipe forming section 12 and the pin 322 of the support side chuck 32.
It is wound particularly carefully around the intersection of the main pipe part forming part 11 and the branch pipe part forming part 12 in such a manner as to be wound in a turn. The feed eye 2 is operated in two directions, namely, a movement operation in the X-axis direction along the axis of the main tube forming portion 11 and a rotation operation indicated by V. Note that the branch pipe forming section 1
When the curable resin-impregnated reinforcing fiber is wound around the intersection with the base end of No. 2, in addition to the above-described operation, the Z-axis direction moving operation that approaches and separates from the main pipe forming portion 11, and the vertical Y-axis direction A 5-axis operation in which a moving operation and a rotation operation indicated by U are added may be performed. Finally, as shown in FIG.
Of the shaft of the drive-side chuck 31 is stopped.
The fiber is cut at the portion of the support side chuck 32 and the portion of the pin 322 of the support side chuck 32. Then, the drive-side chuck 31 is removed. As a second step, as shown in FIG. 8, the T-shaped mandrel 1 is rotated about the branch pipe forming section 12 as a rotation axis, and the intersection between the branch pipe forming section 12 and the main pipe forming section 11 is established. The curable resin-impregnated reinforcing fiber 4 is wound around the portion. First, as shown in FIG. 8A, the head 122 of the branch pipe forming section 12 is fixed to the driving chuck 31 by vacuum suction. A branch tube pressing portion 33 is provided at the center of the T-shaped mandrel 1 opposite to the portion where the branch tube forming portion is mounted.
Is pressed. Next, as shown in FIG. 8B, a resin-impregnated non-woven fabric for forming a weeping prevention layer is wound around the branch tube forming portion 12 as necessary. Next, FIG.
As shown in FIG. 5, the shaft of the rotating machine 3 is rotated to rotate the branch pipe forming portion 12 as a rotation axis, and the feed eye 2 is used.
A curable resin-impregnated reinforcing fiber 4 obtained by impregnating a plurality of glass rovings with a thermosetting resin liquid is supplied to the pipe connecting part forming part 121 of the branch pipe part forming part 12 and the base end of the branch pipe part forming part 12. It is wound around the periphery of the central portion of the main pipe portion forming portion 11. At this time, first, wrap with a hoop winding,
Next, it winds by two types of helical windings with different angles. When winding by helical winding, as shown in FIG. 8 (c), helical winding is performed between the pin 312 of the drive-side chuck 31 and the central portion of the main tube forming portion 11. At this time, the curable resin-impregnated reinforcing fiber 4 is wound around the intersection with the main pipe part forming part 11 so that the main pipe part forming part 11 is wound up to the part opposite to the part where the branch pipe part forming part 12 is mounted. Thus, the intersection between the main pipe and the branch pipe of the molded product is strengthened. The feed eye 2 performs two-axis operation of a moving operation in the X-axis direction along the axis of the branch tube forming portion 12 and a rotating operation indicated by V. In addition to the above operation, a movement operation in the Z-axis direction which approaches and separates from the branch pipe portion forming section 12, and a Y movement in the vertical direction
5 that includes an axial movement operation and a rotation operation indicated by U.
The operation of the shaft may be performed. Finally, the rotation of the shaft of the rotating machine 3 is stopped, and the fiber is cut at the pin 312 of the drive-side chuck 31. As a third step, as shown in FIG. 9, the curable resin-impregnated reinforcing fiber wound around the T-shaped mandrel 1 is heated and cured by the heater 5 to form a fiber-reinforced resin layer. As a fourth step, as shown in FIG. 10, first, the branch pipe forming portion 12 of the T-shaped mandrel 1 is removed by crushing it. At this time, the hot-melt bonding used for bonding the branch tube forming portion 12 and the connecting portion 113 to the main tube forming portion 11 is melted by heating during drying, so that there is no problem in removing the mold. Next, the main pipe portion forming part 11 is released from the mold by crushing it to obtain a T-shaped fiber reinforced pipe joint. When the curable resin-impregnated reinforcing fiber is wound, it is preferable to control the operation of the feed eye 2 and the rotation of the T-shaped mandrel 1 by computer, since high precision and efficiency can be achieved. . The control accuracy is not problematic when controlled by a computer.
An accuracy of 1 mm or more is sufficient. In addition, it is preferable to use an AC servomotor for the motor of each axis. Example 1 Using a feed eye 2 shown in FIG. 1, a T-shaped mandrel 1 shown in FIG. 2, and a rotating machine 3 shown in FIGS.
According to the process shown in FIG.
T-shaped pipe joint for water supply of 0 mm (main pipe: 150 mm,
A branch tube section 75 mm) was produced. As the resin composition in the curable resin-impregnated reinforcing fiber, the resin-impregnated nonwoven fabric, the resin-impregnated glass mat and the cloth, 100 parts by weight of an unsaturated polyester resin (manufactured by Mitsui Toatsu Co., Ltd., trade name: "Ester R235") was used. A mixture of 0.6 parts by weight of an agent (manufactured by Kayaku Akzo Co., Ltd., trade name "Kayamec M") and 0.5 parts by weight of an accelerator (containing 6% of cobalt) was used. As the reinforcing fibers in the curable resin-impregnated reinforcing fibers, ten glass rovings (count: 2230 g / km) were used. 3mm thickness as non-woven fabric in resin impregnated non-woven fabric
Felt-like non-woven fabric (manufactured by Nippon Vilene Co., Ltd.). As the glass mat and cloth in the resin-impregnated glass mat and cloth, respectively, 150 m in width
m, 100 mm long chopped strand mat (manufactured by Asahi Fiber Glass: count 450 g / m ² ) and roving cloth (manufactured by Asahi Fiber Glass: count 330 g)
/ M ² ), allowed to stand naturally (1 hour), semi-cured, and then wound around the felt-like non-woven fabric once, followed by molding. In the forming by glass roving, the feed eye 2 was operated in two axes of X and V, and the helical winding after the hoop winding was 3 mm thick. Curing of the resin by the heater was performed at 80 ° C. for 2 hours. As a result, the molding time (excluding the time of natural standing; the same applies hereinafter) from the start of mounting the branch pipe forming portion 12 of the T-shaped mandrel 1 to the shaft of the rotating machine 3 until the shaft is removed from the shaft is 25 minutes. Was. Further, a pipe was connected to a T-shaped pipe joint for water supply, and a hydrostatic pressure breaking test was performed. As a result, the pressure resistance without causing water leakage was 38 kg / cm ² , and when it exceeded this, water leakage started, and the maximum breakdown pressure was 45 kg / cm ² . As shown in FIGS. 11 and 12, the hydrostatic pressure rupture test was carried out for the water supply T obtained by the present invention.
The short pipe 9 is connected to each pipe connecting portion 81 of the U-shaped pipe joint 8, the end of the short pipe 9 is covered with a flange 10, and a hydrostatic pressure is applied from a part of the flange 10. , The pressure resistance was evaluated. Embodiment 2 In the same manner as in Embodiment 1 except that the feed eye is operated for five axes of X, V, Y, Z and U instead of operating for two axes of X and V. Then, the same T-shaped pipe joint for water supply as in Example 1 was manufactured. As a result, the molding time was 18.5 minutes. Further, a pipe was connected to a T-shaped pipe joint for water supply, and a hydrostatic pressure breaking test was performed. as a result,
The pressure resistance without water leakage is 42 kg / cm ²
If this is exceeded, water leakage will start, and a maximum of 55 kg
/ Cm ² . Embodiment 3 In the same manner as in Embodiment 1, except that the feed eye is operated for four axes of X, V, Y and Z instead of being operated for two axes of X and V. , T for water supply similar to the embodiment
The manufacture of a U-shaped pipe joint was carried out. As a result, the molding time is 1
4 minutes. Further, a pipe was connected to a T-shaped pipe joint for water supply, and a hydrostatic pressure breaking test was performed. As a result, the pressure resistance without causing water leakage was 42 kg / cm ² , and when it exceeded this, water leakage started, and the maximum breakdown pressure was 55 kg / cm ² . Comparative Example 1 The curable resin-impregnated reinforcing fiber was wound around a mandrel.
Except for using the hand-up molding method without using the feed eye shown in FIG. 1 and the rotating machine 3 shown in FIGS. 3 to 6 and without following the steps shown in FIGS. In the same manner as in Example 1, a T-shaped pipe joint for water supply was manufactured in the same manner as in Example 1, except that the average thickness was 15 mm. As a result, the molding time required 45 minutes.
Further, a pipe was connected to a T-shaped pipe joint for water supply, and a hydrostatic pressure breaking test was performed. As a result, the pressure resistance without causing water leakage was 38 kg / cm ² , and when it exceeded this, water leakage started, and the maximum breakdown pressure was 45 kg / cm ² . When a product having an average thickness of 10 mm similar to that of the first embodiment is manufactured, the product has large variations.
The pressure resistance of 38 kg / cm ² or more cannot always be satisfied, and it is always 38 kg / cm ² as in Example 1.
In order to obtain a product having the above pressure resistance, the average thickness had to be 15 mm. As is clear from the description of Examples 1 to 3 and Comparative Example 1, in the case of Examples, the molding time was short and the internal pressure strength was high. On the other hand, in the case of the comparative example, the molding time was long, and in order to stably obtain a product having the same strength as that of the same example, it was necessary to increase the thickness thereof, resulting in an increase in cost. The method for producing a fiber reinforced resin pipe joint of the present invention is as follows.
With the above configuration, a T-shaped pipe joint with high strength and high precision can be manufactured with high productivity and at low cost. [0049]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an operation of a feed eye used in the present invention. FIG. 2 is a front view showing an example of a T-shaped mandrel used in the present invention. FIG. 3 is a front view showing an example of a rotating machine used in the present invention. FIG. 4 shows a state in which the head of one end of the main tube forming part is fixed to the drive side chuck and the head of the other end of the main tube part forming part is fixed to the supporting side chuck in the rotating machine shown in FIG. FIG. FIG. 5 is a cross-sectional view of the rotating machine shown in FIG. 3, in which the head of the other end of the main pipe forming section is fixed to the support side chuck, and the pressing section of the branch pipe core pressing section contacts the center of the main pipe forming section. It is a front view showing the state where it did. FIG. 6 is a perspective view of the rotary machine shown in FIG. 3, in which the head of one end of the branch pipe forming section is fixed to the drive side chuck, and the pressing section of the branch pipe core pressing section abuts the center of the main pipe section forming section. It is a front view showing the state where it did. FIG. 7 is a front view illustrating a state in which the main pipe portion forming portion of the T-shaped mandrel is rotated about a rotation axis and a curable resin-impregnated reinforcing fiber is wound therearound in one embodiment of the present invention. FIG. 8 is a front view illustrating a state in which the branch pipe portion forming portion of the T-shaped mandrel is rotated about a rotation axis and a curable resin-impregnated reinforcing fiber is wound therearound in one embodiment of the present invention. FIG. 9 shows an example of a heater according to an embodiment of the present invention.
It is a front view showing the state where a resin is hardened and a fiber reinforced resin layer is formed. FIG. 10 is a front view showing a state in which the T-shaped mandrel is removed from the mold in one embodiment of the present invention. FIG. 11 is a front view illustrating a state where a hydrostatic pressure test is performed on a T-shaped pipe joint obtained according to the present invention. FIG. 12 is a longitudinal sectional view showing a connection part in a hydrostatic pressure test of a T-shaped pipe joint obtained according to the present invention. [Description of Signs] 1 T-shaped mandrel 2 Feed eye 3 Rotating machine 4 Curable resin impregnated reinforcing fiber 11 Main pipe section forming section 12 Branch pipe section forming section 31 Drive side chuck 32 Support side chuck 33 Branch pipe core pushing section 111, 121 Pipe connection part forming part 113 Connection part 331 Pressing part

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 70/00-70/88

Claims (1)

(57) [Claims 1] A curable resin-impregnated reinforcing fiber is wound around a T-shaped mandrel, the resin is cured to form a fiber-reinforced resin layer, and then the T-shaped mandrel is removed. A method of manufacturing a fiber reinforced resin pipe joint by using a T-shaped mandrel ,
It consists of a molded product formed by blow molding
A branch pipe forming part connecting part is provided that protrudes in the direction perpendicular to the axial direction.
Blow connection to the branch pipe forming section connection of the main pipe forming section
Base end of branch pipe forming part consisting of molded product formed by shape
Is configured to be detachable by fitting an opening provided at the end thereof . First, the T-shaped mandrel in the assembled state is rotated by using the main pipe portion forming portion as a rotation axis. Rotate and wind the curable resin-impregnated reinforcing fiber around the intersection from the main pipe part forming part to the branch pipe part forming part, and then rotate the branch pipe part forming part as a rotation axis to around the branch pipe part forming part. After the curable resin-impregnated reinforcing fibers are wound around the resin and these resins are cured to form a fiber-reinforced resin layer , first, a T-shaped mandrel is formed.
The mold is removed by crushing the branch tube forming part of
A method of manufacturing a fiber reinforced resin pipe joint, comprising: releasing the main pipe portion forming portion by crushing it .