JP3132887B2 - Method for producing fiber-reinforced cured resin molded article - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a method for producing a fiber-reinforced curable resin molded product by a filament winding method (hereinafter, referred to as a FW method).

[0002]

2. Description of the Related Art In a fiber-reinforced curable resin molded article by the FW method, a curable resin-impregnated reinforcing fiber is secured on the outer periphery of a mandrel by, for example, rotating a mandrel and moving a feed eye to secure circumferential performance. A so-called composite winding of a hoop winding and a helical winding for ensuring the axial performance is performed, the curable resin is cured, and the mandrel is removed as required.

In order to perform this so-called composite winding in a short time and with high precision, for example, Japanese Patent Laid-Open No. 62-282920 discloses a carriage traverse a as shown in FIG.
Is provided with an eye having a plurality of parallel voids b, and at least one continuous fiber c impregnated with resin is passed through each void b of the eye, and a mandrel rotation axis e of the void b is provided.
A method has been proposed in which a helical path is passed through a portion d perpendicular to the helical path.

[0004]

However, Japanese Patent Application Laid-Open No. 62-1987
In the case of Japanese Patent No. 282920, since the helical path passes through a vertical portion d perpendicular to the surface of the rotation axis e, the fiber easily converges on the rotation axis e and the rotation axis e
However, there is a problem that the fiber cannot be wound in a spread state.

[0005] The present invention solves the above-mentioned conventional problems and performs so-called composite winding in a state in which the curable resin-impregnated reinforcing fibers are uniformly distributed on the mandrel, so that the circumferential and axial strengths are averaged. The purpose of the present invention is to produce an excellent fiber-reinforced curable resin molded article.

[0006]

SUMMARY OF THE INVENTION The present invention is directed to a fiber reinforced curable composition in which a curable resin-impregnated reinforcing fiber is wound around the mandrel by rotating a mandrel while moving a feed eye, and then the curable resin is cured. In the method for producing a resin molded product, the feed eye has a plurality of slit portions formed by a plate-shaped guide and a roll fixed in front of the guide, and the curable resin-impregnated reinforcing fiber is formed into a roll through the slit portion. This is a method for producing a fiber-reinforced curable resin molded product supplied to the outer periphery of the mandrel while pressing.

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). Is woven in a girder shape, and the weaving method and width are not particularly limited.) Is preferably used. The curable resin-impregnated reinforcing 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. For the curable resin, if necessary, Aerosil,
A filler such as a glass balloon, calcium carbonate, or talc may be added, and the amount of the filler is preferably 0.5 to 50 parts by weight based on 100 parts by weight of the curable resin. In addition, a curing agent or a curing accelerator is generally added to the curable resin,
Conventionally known ones may be used, and as the thermosetting agent,
For example, methyl ethyl ketone peroxide, benzoyl peroxide and the like, and as the curing accelerator,
For example, cobalt naphthenate, manganese naphthenate, dimethylaniline and the like can be mentioned.

Next, an example of the manufacturing method of the present invention will be described with reference to the drawings. FIG. 1 is a side view showing a main part for describing the manufacturing method of the present invention. A large number of rovings 11 are passed through guide rolls, respectively.
It is led to 0. As the roving 11, glass fiber roving, carbon fiber roving, or the like is generally used. Although a large number of rovings 11 are shown for convenience, three dozens are used. The impregnation tank 41 generally contains a resin liquid such as a thermosetting resin liquid or a photocurable resin liquid.
When passing through the resin impregnating roll 40, the resin impregnating roll 40 causes a large number of rovings 11 to flow.
To an appropriate amount. A large number of the curable resin-impregnated reinforcing fibers 12 thus formed are passed through the feed eye 50 and wound around the outer periphery of the T-shaped mandrel 70 at a fixed angle.

FIG. 2A is a front view showing an example of a feed eye, and FIG. 2B is a side view thereof. FIG. 3 is a front view showing a state where a roll is removed from the feed eye. In the figure, a feed eye fixing portion 51 having a substantially L-shaped vertical section is provided.
Is erected. A plate-like guide mounting plate 52 and a pair of rolls 53 are screwed to the column 511 by support pins 54. The fixing pin 51 has a support pin 54.
Is provided with a female screw 541 into which is screwed. The plate-shaped guide mounting plate 52 has a horizontally long gap, and the width of the mounting plate 52 is generally 2 to 3 so as to partition the gap in the vertical direction.
8 mm plate-shaped guides 521 are attached at regular intervals. Between the pair of rolls 53, 53, regulating bars 55, 55 are provided near the ends in the longitudinal direction, and the width of the rolls 53, 53 is regulated.

The guide 521 has a plate shape, and a preferable size is 2 to 5 mm in thickness × 5 to 20 mm in depth. The reason is as follows. First, when the guide has a cylindrical shape, the fluffy fibers are generally smooth and not so large in diameter when the reinforcing fibers having fluff pass between the guides. This is because such a fluffy fiber makes it impossible for a large number of fibers to constantly pass between the guides because the fiber travels along the outer surface of the cylindrical guide (which cannot pass many fibers). The reason why the dimension of the plate-shaped guide is preferably 2 to 5 mm in thickness x 5 to 20 mm in depth is because the above-mentioned fibers can be prevented from fluffing.

A plurality of slits 56 are formed by the rolls 53, 53 and the plate-shaped guide 521, and the depth of the slits 56 is usually 10 to 40 mm. Then, the curable resin reinforcing fiber is passed in the direction of the arrow in FIG. The feed eye 50 is attached to a traverse table (not shown) and moves in the X-axis direction along the axis of the T-shaped mandrel 70, as shown in FIG. Three-dimensional movement operation of the movement operation in the vertical direction and the movement operation in the vertical Y-axis direction;
A rotation operation indicated by V that rotates on a horizontal plane including a rotation axis of the V-shaped mandrel 70 and a rotation operation indicated by U that rotates with the direction of feeding the curable resin-impregnated reinforcing fiber as the rotation axis are enabled. . The movement of the feed eye 50 and the rotation of the mandrel 70 are operated according to a predetermined program under computer control.

As shown in FIG. 5, a T-shaped mandrel 70 is provided.
Is composed of a main pipe part forming part 71 and a branch pipe part forming part 72 which are separate bodies.

The main pipe portion forming portion 71 is a molded product formed by blow molding using polyethylene or the like, is a linear hollow body, and has pipe connection portion forming portions 711 at both ends. Both ends are a closed head 712. At a substantially central portion of the main pipe portion forming portion 71, a branch pipe portion forming portion connecting portion 71 projecting slightly in a direction perpendicular to the axial direction thereof.
3 are provided.

The branch pipe section forming section 72 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 721 at a tip end. The tip is a closed head 722. An opening 723 is provided at the end of the base end. Then, the branch pipe forming section 72 is mounted on the main pipe forming section 71 such that the opening 723 is fitted into the connecting section 713 of the main pipe forming section 71, and the T-shaped mandrel 70 is formed. At this time, the outer peripheral surface of the connection portion 713 and the opening 723
It is preferable that the inner peripheral surfaces are firmly fixed to each other with a hot-melt adhesive or the like as appropriate.

As shown in FIGS. 6 and 8, a T-shaped mandrel 70 is rotatable about a branch pipe axis and a main pipe axis by a rotation shaft 80. The rotating shaft 80 includes a drive-side chuck 81, a support-side chuck 82, and a branch tube core pushing portion 83.

When rotating around the branch pipe axis,
As shown in FIG. 6, the head 722 of the branch pipe forming section 72 of the T-shaped mandrel 70 is fixed to the drive-side chuck 81, and a branch pipe forming section 72 substantially at the center of the main pipe forming section 71 is provided. The distal end of the branch pipe core pushing portion 83 is pressed against the surface in the direction opposite to the direction of rotation, and is rotated around the rotation axis 80.

When the T-shaped mandrel 70 is rotated about the main tube axis, the head 711 of the main tube forming portion 71 is fixed to the drive chuck 81 and the support chuck 82 as shown in FIG. , Around the rotation axis 80.

Next, one embodiment of the method for producing a fiber-reinforced cured resin molded article of the present invention using a T-shaped mandrel 70 shown in FIG. 5 and a feed eye 50 shown in FIGS. This will be described with reference to FIGS.

In the first step, as shown in FIG. 6, the curable resin-impregnated reinforcing fiber 12 is rotated around the branch pipe forming section 72 by rotating the branch pipe axis of the T-shaped mandrel 70 as a rotation axis. Wrap.

First, the head 722 of the branch pipe forming section 72 is fixed to the driving chuck 81 of the rotary shaft 80 by vacuum suction. If necessary, appropriate fixing means such as bolting may be employed. The distal end portion of the branch pipe core pushing section 83 is pressed against a surface opposite to the side where the branch pipe forming section 72 substantially at the center of the main pipe forming section 71 is provided.

Next, if necessary, a resin-impregnated nonwoven fabric for forming a weeping prevention layer is wound around the branch tube portion forming portion 72.

Next, the curable resin-impregnated reinforced fiber 12 in which a plurality of glass rovings are impregnated with a thermosetting resin liquid is rotated by using the feed eye 50 to rotate the branch pipe part axis as the rotation axis 80, and the branch pipe is rotated. It is wound around the intersection with the part forming part 72 and the main pipe part forming part 71. At this time, winding is performed first by hoop winding, then by helical winding, and then again by hoop winding.

At this time, as shown in FIG. 7, the curable resin-impregnated reinforcing fibers 12 are first divided into a plurality of slits 56 by a plurality of plate-shaped guides 521 so that the horizontally long voids are vertically separated. The bundle is wound around the mandrel 70 by the plurality of plate-shaped guides 521 while being uniformly dispersed in the width direction for each fixed bundle and widened along the surface of the roll 53.

The feed eye 50 performs two-axis operation of a moving operation in the X-axis direction along the axis of the branch pipe forming portion 72 and a rotating operation indicated by V.

Finally, the drive-side chuck 81 of the rotating shaft 80
Then, the support of the branch pipe core pressing portion 83 is released, and the T-shaped mandrel 70 around which the curable resin-impregnated reinforcing fiber 12 is wound is taken out.

As a second step, as shown in FIG. 8, by rotating the main pipe portion axis as a rotation axis, the hardening resin impregnated reinforcing fiber is formed around the intersection with the main pipe portion forming portion 71 and the branch pipe portion forming portion 72. 12 is wound.

First, the heads 71 at both ends of the main pipe forming part 71
2 is fixed to the drive-side chuck 81 and the support-side chuck 82 of the rotating shaft 80 by vacuum suction, respectively. Next, a resin-impregnated nonwoven fabric for weeping prevention is wound around the main pipe portion forming portion 11 as necessary. Next, the main pipe shaft 80
Is used as a rotation axis, and a curable resin-impregnated reinforcing fiber 12 obtained by impregnating a plurality of glass rovings 11 with a thermosetting resin liquid using a feed eye 50 is fed into a main pipe portion forming portion 71.
And it winds around the intersection with the base end of the branch pipe part formation part 72.

At this time, first, wrap with a hoop winding,
Next, it winds by helical winding, and also winds again by hoop winding.

At this time, as shown in FIG. 7, the curable resin-impregnated reinforcing fiber 12 is first formed in a mandrel through a plurality of slits 56 with a horizontally long void portion partitioned by a plurality of plate-shaped guides 521 in a vertical direction. The bundle is wound around the mandrel 70 by the plurality of plate-shaped guides 521 while being uniformly dispersed in the width direction for each fixed bundle and widened along the surface of the roll 53.

The feed eye 50 is operated in two directions, that is, a moving action in the X-axis direction along the axis of the main pipe forming portion 71 and a rotation action indicated by V. In addition, when the curable resin-impregnated reinforcing fiber is wound around the intersection with the base end of the branch pipe part forming part 72, in addition to the above-described operation, the movement in the Z-axis direction which approaches or separates from the main pipe part forming part 71 as appropriate. Actuation, vertical Y
The operation of the shaft in addition to the axial movement operation and the rotation operation indicated by U is performed.

Finally, the rotation of the rotary shaft 80 is stopped, and the drive-side chuck 71 and the support-side chuck 82 of the rotary shaft 80 are removed, and the T-shaped mandrel 1 around which the curable resin-impregnated reinforcing fiber 12 is wound is removed. Take out.

As a third step, as shown in FIG. 9, the curable resin-impregnated reinforcing fiber wound around the T-shaped mandrel 70 is heated and cured by the heater 90 to form a fiber-reinforced resin layer.

Further, the following fourth step is performed if necessary.
As a fourth step, as shown in FIG. 10, first, the branch pipe forming portion 72 of the T-shaped mandrel 70 is released from the mold by crushing it. At this time, the branch pipe forming section 72 and the main pipe forming section 71
The hot-melt bonding used for bonding to the connecting portion 713 is melted by heating during drying, so that there is no problem in demolding. Next, the main pipe portion forming portion 71 is released from the mold by crushing it to obtain a T-shaped fiber reinforced curable resin pipe joint 100 as shown in FIG.

[0035]

According to the method for producing a fiber-reinforced curable resin molded article of the present invention, the feed eye has a plurality of slits formed by a plate-shaped guide and a roll fixed in front of the guide. By supplying the impregnated reinforcing fibers to the outer periphery of the mandrel while pressing the rolls through the slits, the curable resin-impregnated reinforcing fibers are guided to the plurality of slits to be uniformly distributed in the width direction and to be impregnated with the curable resin. The reinforcing fibers are widened in the width direction on the surface along the roll surface. The widened curable resin-impregnated reinforcing fiber is supplied to the mandrel, and can be wound evenly in a wide and stable state, and has excellent circumferential and axial strength on average. Articles can be manufactured with good productivity and at low cost. Further, since a plate-shaped guide is used as a guide, even if ordinary reinforcing fibers having fluff are fed between the guides, further fluffing or fiber breakage is prevented.

[0036]

EXAMPLE 1 Using a T-shaped mandrel 70 shown in FIG. 5 and a feed eye 50 shown in FIGS. 2 to 4 in accordance with the steps shown in FIGS. As shown, a T-shaped fiber-reinforced thermosetting resin pipe joint (main pipe part: 150 mm, branch pipe part: 75 mm) was manufactured.

As the resin composition, 100 parts by weight of an unsaturated polyester resin (trade name "Ester R235" manufactured by Mitsui Toatsu Co., Ltd.) and 0.6 part by weight of a curing agent (trade name "Kayamek M" manufactured by Kayaku Akzo Co., Ltd.) And an accelerator (containing 6% cobalt)
A mixture with 0.5 parts by weight was used. As a reinforcing fiber in the curable resin-impregnated reinforcing fiber, glass roving (count 22
30 g / km) were used. In feed eye 50,
The operation of five axes of X, Y, Z, V, and U was performed. Curing of the resin by the heater was performed at 130 ° C. for 2 hours. As a result, a T-shaped fiber-reinforced thermosetting resin pipe joint 100 as shown in FIG. 11 was obtained.

T-shaped fiber reinforced thermosetting resin pipe joint 10
The molding time required to wind the curable resin-impregnated reinforcing fiber around the mandrel 70 required for the production of No. 0 was 30 minutes.

The thickness deviation of the obtained T-shaped fiber-reinforced thermosetting resin pipe joint 100 was measured.
The thickness deviation in the portion A of the U-shaped fiber reinforced thermosetting resin pipe joint 100 was 11.5 ± 1 mm, and the thickness deviation in the portion B was 5.5 ± 1 mm.

In addition, a pipe was connected to a T-shaped fiber-reinforced thermosetting resin pipe joint, and a hydrostatic pressure fracture test was performed. as a result,
40K pressure resistance without water leakage and destruction
g / cm ² or more.

Note that the hydrostatic pressure fracture test was performed in accordance with FIGS.
As shown in the figure, a short pipe 1 is connected to each pipe connecting portion 101 of the T-shaped fiber-reinforced thermosetting resin pipe joint 100 obtained by the present invention.
No. 02 was connected, the end of the short pipe 102 was covered with a flange 103, and hydrostatic pressure was applied from a part of the flange 103 to evaluate the pressure resistance.

Comparative Example 1 A curable resin-impregnated reinforcing fiber was wound around a mandrel in the same manner as in Example 1 except that the feed eye 50 was not used and an annular feed eye 50 'was used as shown in FIG. Thus, a T-shaped fiber-reinforced thermosetting resin pipe joint similar to that of Example 1 was manufactured. As a result, the molding time for winding the curable resin-impregnated reinforcing fibers around the mandrel 70 required 50 minutes.

When the thickness deviation of the obtained T-shaped fiber-reinforced thermosetting resin pipe joint 100 was measured, the T-shape shown in FIG.
The thickness deviation in the portion A of the U-shaped fiber reinforced thermosetting resin pipe joint 100 was 16 ± 5 mm, and the thickness deviation in the portion B was 7 ± 3 mm. Further, a pipe was connected to a T-shaped fiber-reinforced thermosetting resin pipe joint, and a hydrostatic pressure fracture test was performed. As a result, the pressure resistance was 40 kg / cm ² or more.

[0044]

The method for producing a fiber-reinforced curable resin molded article of the present invention is configured as described above, so that the fiber-reinforced curable resin molded article having excellent strength in the circumferential and axial directions on average. Can be manufactured with good productivity and at low cost.

[0045]

[Brief description of the drawings]

FIG. 1 is a front view showing a main part of an embodiment of the method of the present invention.

FIG. 2 is a front view extrusion and a side view showing an example of a feed eye used in the present invention.

FIG. 3 is a front view when a roll is removed from a feed eye shown in FIG. 2;

FIG. 4 is an explanatory diagram showing an operation of a feed eye used in the present invention.

FIG. 5 is a front view showing an example of a T-shaped mandrel used in the present invention.

FIG. 6 is a front view illustrating a state in which a branch pipe portion forming portion of a T-shaped mandrel is rotated about a rotation axis and curable resin-impregnated reinforcing fibers are wound therearound in one embodiment of the present invention.

FIG. 7 is a side view illustrating a state in which a curable resin-impregnated reinforcing fiber passes through a feed eye in one embodiment of the present invention.

FIG. 8 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. 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 hardening 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 longitudinal sectional view of a T-shaped fiber-reinforced thermosetting resin pipe joint obtained by the present invention.

FIG. 12 is a front view illustrating a state in which a hydrostatic pressure test is performed on the T-shaped fiber-reinforced thermosetting resin pipe joint obtained according to the present invention.

FIG. 13 is a longitudinal sectional view showing a connection portion in a hydrostatic pressure test of a T-shaped pipe joint obtained by the present invention.

FIG. 14 is a side view showing an example of a conventional feed eye.

FIG. 15 is a side view showing another example of the conventional feed eye.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Roving 12 Curable resin impregnated reinforced fiber 40 Resin impregnation roll 41 Impregnation tank 50 Feed eye 51 Feed eye fixing part 521 Plate-shaped guide 53 Roll 55 Width restriction bar 56 Slit part 58 Supply path 70 Mandrel 71 Main pipe part forming part 72 Branch pipe Forming part 80 Rotating shaft 81 Drive side chuck 82 Support side chuck 83 Branch pipe core pushing part 90 Heater 100 Fiber reinforced thermosetting resin pipe joint

Claims (1)

(57) [Claims] 1. A method for producing a fiber-reinforced curable resin molded product, comprising: rotating a mandrel while moving a feed eye, winding curable resin-impregnated reinforcing fibers around the outer periphery of the mandrel, and then curing the curable resin. The feed eye has a plurality of slits formed by a plate-shaped guide and a roll fixed in front of the guide, and the curable resin-impregnated reinforcing fiber is supplied to the outer periphery of the mandrel while being pressed to the roll via the slit. A method for producing a fiber-reinforced curable resin molded product.