JPH0760851A - Manufacture of fiber-reinforced resin laminate - Google Patents

Abstract

PURPOSE:To stably rewind resin-impregnated fiber bundles without using pins. CONSTITUTION:In a method wherein curable resin-impregnated fiber bundles are laminated on a forming mold by winding and rewinding at the ends of the forming mold to cure the resin of a laminate and the ends of the cured laminate are cut to be removed, auxiliary forming molds 22 having step portions 221 are connectively provided to the ends 21 of the forming mold, and the resin-impregnated fiber bundles are rewound at the auxiliary forming molds 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fiber-reinforced resin tubular body,
For example, the present invention relates to a method for manufacturing a fiber-reinforced resin laminate used for manufacturing a fiber-reinforced resin pipe joint.

[0002]

2. Description of the Related Art In general, a fiber-reinforced resin tubular body is manufactured by a filament winding method, that is, a molding die is rotated to pass a curable resin-impregnated fiber material through a feeding eye and then continuously. The resin-impregnated fiber material is rewound at the end of the molding die by traversing the fiber eye and traversing the feed eye, and thus the curable resin-impregnated fiber material is wound and laminated in a plurality of layers, and the resin of the laminate is A method of releasing the molded body from the mold after curing is used.

In this case, usually, pins are planted at both ends of the mold in the axial direction of the mold or in a direction perpendicular to the axial direction, and the resin-impregnated fiber material is rewound by hooking the pins to cure the resin. , Mold removal (Japanese Patent Laid-Open No. 61-3732).
Issue).

[0004]

However, the resin-impregnated fibrous material may be formed into a strip shape so as to be uniformly wound around the molding die, and its width may be considerably widened. In this case,
It is also necessary to lengthen the length of the vertical pin according to the strip width, and in such a long pin, the amount of bending of the pin due to the tension of the resin-impregnated fiber material is large depending on the position where the resin-impregnated fiber material is caught. Then, the resin-impregnated fiber material is likely to come off, and there is a concern that the hooked state may become unstable.

Further, the cross section (belt shape) of the resin-impregnated fiber material is oriented vertically at the hooked portion of the pin, the resin-impregnated fiber material portion near the pin is twisted by 45 ⁰ , and the winding angle of the resin-impregnated fiber material is increased. In the case of a small size, this twisted portion becomes considerably long, and there is a concern that the mechanical strength of the molded product may be adversely affected.

An object of the present invention is to provide a method for producing a fiber reinforced resin laminate which can stably rewind a resin-impregnated fiber material in a filament winding method without using pins.

[0007]

The method for producing a fiber-reinforced resin laminate of the present invention comprises laminating a curable resin-impregnated fiber material on a molding die by winding and rewinding at the end of the molding die. In a method of curing a resin of a body and cutting and removing an end portion of the cured body, an auxiliary mold having a step is continuously provided to an end of a molding die, and the resin-impregnated fiber material is rewound in the auxiliary mold. This is a feature.

The structure of the present invention will be described below with reference to the drawings. FIG. 1 shows an outline of an ordinary filament winding apparatus used in the present invention, in which a fiber material drawn out from a bobbin 11 is passed through a resin impregnation tank 12 and further aligned in a band shape by a feed eye 13 and then core type. 1, the feeding eye 13 is traversed in the axial direction of the core die 1 and the core die 1 is rotated at a speed corresponding to the winding pattern of the resin-impregnated fiber material. .

FIG. 2 shows a molding die used for manufacturing a straight pipe joint (socket) according to the present invention. In FIG. 2, 1 is a core type. Reference numeral 2 denotes a molding die end member, and an auxiliary die 22 having a step portion 221 having an outer diameter smaller than the outer diameter of the tip of the end die body 21 is formed in the end die body 21 forming the inner surface of the receiving port of the pipe joint. The core type 1 has a structure in which they are continuously connected.
It is attached to both ends of.

The end-type main body 21 accommodates a groove portion 212 for accommodating a straight portion 211 forming an inner surface of a receiving end tip portion, a rubber ring, a groove portion for accommodating a retaining ring 213 and an insertion end. A sleeve portion 214 is provided.
Further, the auxiliary die 22 is provided with a large diameter portion 222 having the same outer diameter as that of the straight portion 211, and the large diameter portion 222 is integrated with the end die body 21, and further the end plate portion 223 is provided. The shaft rod 1 of the core 1 is provided in the central hole of the end plate portion 223.
It is fitted in 4. 3 is an end plate portion 223 on one end side of the core die 1
It is a pin protruding near the outer periphery of the
(10 to 10 ranges) may be provided at equal intervals in the circumferential direction.

In order to manufacture the linear pipe joint according to the present invention, the molding die end members 2 and 2 are provided at both ends of the core die 1 in the filament winding apparatus shown in FIG. 1 as shown in FIG.
And pulling out the curable resin-impregnated fiber material from the feed eye 13 and winding the fiber material around the shaft rod 14 on one end side of the core die 1 and then rotating the core die 1 and feeding eye 1
3 is run toward the other end of the core type.

Thus, the resin-impregnated fiber material is first hooked on the pin 3 on one end side of the molding die, and is wound up on the auxiliary die 22 as the core die 1 rotates. Mold 22 ⇒ end mold body 21 on one end side ⇒ center part of core mold ⇒ end mold body 21 on other end side ⇒ auxiliary mold 22 on other end side
When the resin-impregnated fiber material is wound around and the resin-impregnated fiber material is wound around the auxiliary mold on the other end side at least once, the running direction of the feeding eye is reversed, and from the other end side of the molding die to the one end side. As the winding of the resin reaches the one end side and the resin-impregnated fiber material is wound around the auxiliary mold on the one end side at least once, the running direction of the feed eye is reversed, and thereafter, by repeating the above, the predetermined lamination is performed. A number of wrappings are carried out. In this case, the winding angle of each layer, and thus the running speed of the feed eye or the rotation speed of the core die are set according to the mechanical characteristics required for the product.

In this way, when a predetermined amount of the resin-impregnated fiber material is wound and laminated on the molding die, the laminated body is carried into the curing oven together with the molding die to cure the resin of the laminated body, ,
At the boundary position aa between the end die body 21 and the auxiliary die 22 in FIG. 3 (showing the stage after the end of curing), the hardened body 4 is cut together with the forming die end member 2 with a diamond cutter or the like, and then, Then, the cut pieces are removed from the core mold, and the main body of the cured product is released from the core mold 1 to obtain a fiber reinforced resin linear pipe joint having an end mold main body on the inner surface of the receiving port.

In the winding step of the resin-impregnated fiber material, the auxiliary mold 22 rewinds the resin-impregnated fiber material when the running direction of the feeding eye is reversed. The wrapping angle before rewinding is −β ⁰ , and the wrapping angle after rewinding is + α ⁰ . In this case, the resin-impregnated fiber material immediately after rewinding is hooked on the vertical step surface (224 in FIG. 2) of the auxiliary mold 22, and the tension of the resin-impregnated fiber material is supported at the hooking point, and the tension is already wound near the rewinding point. Since it can be sufficiently prevented from being transmitted to the fiber material having the wrapping angle of −β ⁰ , it is possible to eliminate the winding deviation of the resin-impregnated fiber material that has already been wound, and perform the rewinding stably.

When the resin impregnated fiber material is caught on the vertical step surface 224 of the auxiliary mold 22, the corner (225 in FIG. 2) at the upper end of the step surface serves as a fulcrum of the resin impregnated fiber material.
The state of contact between this corner and the resin-impregnated fiber material greatly contributes to the stability of hooking, and it is necessary to attach R1 to R10 to the corner or to make serrations. Is preferred. Although the diameter and length of the stepped portion 221 depend on the molding thickness, the diameter of the stepped portion 221 is preferably smaller than the outer diameter of the large diameter portion 222 by about 2 to 10 mm in radius, and the length is It is preferably about 0.5 to 1.5 times the band width of the resin-impregnated fiber material. Furthermore, the number of stages can be one or more.

The wrapping angle of the resin-impregnated fiber material in each of the above layers is usually 30 ^{0 to} 90 ⁰ . If winding angle is 30 ⁰ or less, or a longer step part 221, it is safe to more around the winding number of the fibers in the stepped portion 221 so as to stifle fibers before rewinding during rewinding.

In the above example, the molding die end member 2 is fixed to the inner surface of the end portion of the cured body and used as the surface layer of the inner surface of the receiving port of the pipe joint. However, the molding die end member is used as the core end portion. In the molding die end member in this case, the auxiliary die and the end die body are integrated, and after the laminated body is cured, the molding die end member is reduced in diameter. Further, it is possible to remove the core mold from the cured body, and after that, cut the end of the cured body to obtain a straight pipe joint (socket) made of fiber reinforced resin.

In the above example, the auxiliary mold is provided integrally with the end mold body, but the auxiliary mold and the end mold body may be provided separately as described below. FIG. 4 shows a molding die used when manufacturing a curved pipe joint by the manufacturing method of the present invention.

In FIG. 4, reference numeral 1 denotes a bent core type, which is connected with a bolt 15 at the center so as to be divided. Reference numeral 2 denotes a molding die end member, which is an end die body 21 and the end die body 2
1 and an auxiliary mold 22 which is a separate member, and the end mold body 21
Is attached to the end of the core die, the central hole of the auxiliary die 22 is inserted into the shaft rod 14 of the core die 1, and the large-diameter portion 222 of the auxiliary die 22 is attached to the tip of the end die body 21, The step 221 of the mold 22 is located outside the end mold body 21. 3 is auxiliary type 22
This is a pin projecting in the vicinity of the outer periphery of the end plate portion 223, and a plurality of pins can be used as described above.

To manufacture a curved pipe joint by the manufacturing method of the present invention, in the same manner as in the case of manufacturing the above-described straight pipe joint, the core die is rotated and the feed eye is run along the core die. The resin-impregnated fiber material from the feeder eye is sequentially moved along with the feeder eye by the auxiliary mold on one end side ⇒ the end mold body on one end side ⇒ the core center part ⇒ the end mold body on the other end side ⇒ the other end side When winding around the auxiliary mold and winding the resin-impregnated fiber material at least once around the auxiliary mold on the other end side, the running direction of the feeding eye is reversed and the winding from the other end side of the forming mold to the one end side is proceeded. When reaching the one end side and winding the resin-impregnated fiber material at least once around the auxiliary mold on the one end side, the running direction of the feed eye is reversed, and thereafter, the predetermined number of layers are wound by repeating the above. Thus, by laminating a predetermined amount of the resin-impregnated fiber material on the molding die, the laminated body is carried into the curing furnace together with the molding die to cure the resin in the laminated body, and then, as shown in FIG. The hardened body 4 is cut together with the end die body 21 at the tip position aa of the end die body 21 (showing the state after completion of curing), and then the cut piece is removed from the core die 1 and cured. The core die 1 is removed from the body of the body to obtain a curved pipe joint made of fiber reinforced resin having an end die body on the inner surface of the receiving port.

In this example, since the auxiliary mold 22 is separate from the end mold body 21, the auxiliary mold can be reused. In this example, since the core die is bent, in order to follow the rotation of the core die and position the feed eye at a predetermined winding position with respect to the core die, the movement of the feed eye is performed in three axial directions (X-axis). Axis, Y-axis and Z-axis directions), and it is desirable to use computer control.

In the above example, the molding die end member 2 integrally having the end die main body 21 or the auxiliary die 22 is preferably a synthetic resin vacuum molded product, injection molded product or blow molded product. In this case, as the material, thermoplastic resin such as polyvinyl chloride, polyethylene, polypropylene, acryl butadiene styrene, acryl, polycarbonate, polyamide or the like, thermosetting resin such as epoxy or unsaturated polyester, or fiber , A synthetic resin reinforced with particles or the like is used. In addition, it is also possible to use a metal material such as mild steel, aluminum, and stainless that is relatively easy to process.

In addition, in the auxiliary mold separate from the end mold body, in addition to the above-mentioned thermoplastic resin, thermosetting resin, metal, etc., an inorganic material such as concrete can be used.
It is desirable to use a material with excellent wear resistance and durability so that it can be reused for a long time.

The fibers used in the present invention are not particularly limited, but include inorganic fibers such as glass fibers and carbon fibers, or organic fibers such as aramid fibers and polyethylene terephthalate fibers.

The ratio of the fiber to the resin in the curable resin-impregnated fiber material is usually 50 to 200 parts by weight of the curable resin to 100 parts by weight of the reinforcing fiber. As the curable resin, a conventionally known thermosetting resin is used, and particularly, an unsaturated polyester resin, an epoxy resin, a vinyl ester resin, a phenol resin or the like is preferably used, and in some cases, a photocurable resin Also used. A curing agent and a curing accelerator are generally added to these curable resins. As these curing agents and curing accelerators, conventionally known ones can be used,
Examples of the thermosetting agent include methyl ethyl ketone peroxide, benzoylperoxide, and the like, and examples of the curing accelerator include cobalt naphthenate, manganese naphthenate, dimethylaniline, and the like.

If desired, the curable resin may be added with known additives such as fillers such as colloidal silica, glass balun, calcium carbonate, talc, and the like. When adding filler,
The amount added is 0.5 with respect to 100 parts by weight of the curable resin.
It is preferable to set it to 50 parts by weight.

The fiber-reinforced resin laminate produced by the present invention includes pipes, structural members such as propeller shafts, in addition to the above-mentioned pipe joints.

[0028]

Operation: The winding angle of the resin-impregnated fiber material immediately before the winding is set to -β ^0, and the winding angle immediately after the winding is set to + α ⁰ , and the winding is performed. Thus, the wrap angle of the resin-impregnated fiber material already wound around the end mold body portion near the auxiliary mold becomes −β ⁰ , and the resin-impregnated fiber material is wound around the auxiliary mold at least once and then rewound. The winding is performed around the main body of the end die near the auxiliary die at a wrap angle of + α ⁰ .

When the difference (β ⁰ + α ⁰ ) between the winding angle −β ⁰ before rewinding and the winding angle + α ⁰ after rewinding is large (in the case of helical winding), the resin-impregnated fiber material is pulled at the time of rewinding. When the force is transmitted to the wound fiber having the winding angle −β ⁰ already wound, the wound fiber is unwound, but in the resin-impregnated fiber material wound around the auxiliary mold at least once, it is not caught by the step. Due to the hooking, it is difficult to cause a deviation with respect to the pulling force at the time of rewinding, and therefore the pulling force to the wound fiber material already wound around the mold end body near the auxiliary mold at the winding angle -β ^0. Can be well prevented, and the winding deviation of the wound fiber material that has already been wound can be effectively prevented.

Therefore, the resin-impregnated fiber material can be wound in an orderly manner, and the reinforcing effect of the fiber can be exhibited well. This can be confirmed also by the pressure resistance test of the following example products.

[0031]

EXAMPLES Examples of the present invention will be described below. In each of the examples, a fiber material was prepared by aligning ten glass fiber rovings (count 2230 g / km,) and the curable resin was an unsaturated polyester (Ester-R235:
Mitsui Toatsu Chemicals Co., Ltd.) 100 parts by weight, methyl ethyl ketone peroxide curing agent (Kayamek M: Kayaku Akzo Co., Ltd.) 0.6 parts by weight, and curing accelerator (cobalt 6% by weight) 0.5 parts by weight. The unsaturated polyester resin liquid consisting of was used. The content of the glass fiber roving in the resin-impregnated fiber material was 60% by volume.

Example 1 The product is the above-described linear pipe joint (socket) for a water pipe having a diameter of 150 mm, and the molding die end member 2 shown in FIG. 2 is used (chlorination by blow molding). (Made of vinyl resin), the outer diameter of the step portion 221 of the auxiliary mold 22 is 167 mm,
The length was 20 mm. The width of the resin-impregnated fiber material is converged to about 45 mm by the feed eye, and the winding angle is substantially 90 ^0.
Circular winding and helical winding with a winding angle of ± 60 ⁰ were performed according to the production example of the linear pipe joint described above to obtain a laminated body, and the laminated body was heated at 80 ° C. for 2 hours in a heating furnace to cure the resin. Then, according to the production example of the linear pipe joint described above, the end portion of the hardened body was cut and removed, and demolded to obtain a linear pipe joint.

An internal pressure resistance test was carried out on these 20 straight pipe joints, and all of them withstand a hydrostatic pressure of 40 kg / cm ² , and the pulsating pressure test (0 to 20 kg / cm ² ) also meets the water pipe joint specifications of 2 It was easy to satisfy 10,000 times. In this embodiment, the pin 3 in FIG. 2 is used to stabilize the winding at the winding start stage.

Example 2 The product is the above-mentioned bent pipe joint (bend angle is 45 ⁰ ) for a water pipe having a diameter of φ150 mm, and the molding die end member 2 shown in FIG. 4 is used. A blow molding product of vinyl chloride resin was used for the mold body 21, and aluminum was used for the auxiliary mold 22, and the outer diameter of the step portion 221 of the auxiliary mold 22 was 100 mm and the length was 20 mm. A curved pipe joint that converges the width of the resin-impregnated fiber material to about 45 mm with a feed eye, and has a winding angle of substantially 90 ⁰ , a helical winding with a winding angle of ± 56 ⁰ , and another circumferential winding. To obtain a laminate, which is heated in a heating furnace at 80 ° C. for 2 hours to cure the resin, and the cured product end is cut off according to the above-described production example of the bent pipe joint, It was demolded to obtain a curved pipe joint.

An internal pressure resistance test was conducted on 20 of these curved pipe joints, and all of them endured a hydrostatic pressure of 40 kg / cm ² , and the pulsating pressure test (0 to 20 kg / cm ² ) was also 2
It was easy to satisfy 10,000 times. Also in this embodiment, the pin 3 in FIG. 4 is used in order to stabilize the winding at the winding start stage.

Example 3 The same as Example 2 except that the pins were omitted from Example 2. Compared with Example 2, the meat pressure at the receiving end of the bent pipe joint of the product was slightly uneven in the circumferential direction, but all of the products (20 pieces) withstand the hydrostatic pressure of 40 kg / cm ² and the pulsating pressure. test
Regarding (0 to 20 kg / cm ² ), the water pipe joint standard of 20,000 times was easily satisfied.

[0037]

The method for producing a fiber-reinforced resin laminate of the present invention has the structure as described above, and the winding of the resin-impregnated fiber material is stably performed by eliminating the winding deviation of the fiber without using a pin. In addition, it is possible to avoid the risk of fibers coming off due to bending of the pin due to the winding tension of the resin-impregnated fiber material, which is a problem when using pins. It is possible to produce a fiber-reinforced resin product with good workability, which can prevent the resin-impregnated fiber material from being twisted by being kept at a good temperature and can sufficiently exert the reinforcing effect of the reinforcing fiber with a good fiber orientation.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a filament winding device.

FIG. 2 is an explanatory view showing an example of a straight pipe joint forming die used in the present invention.

FIG. 3 is an explanatory view showing a state after curing of a laminated body in the case of manufacturing a linear pipe joint according to the present invention.

FIG. 4 is an explanatory view showing an example of a bending pipe joint forming die used in the present invention.

FIG. 5 is an explanatory view showing a state after the laminated body is cured when the curved pipe joint is manufactured according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 core type 11 fiber supply bobbin 12 resin impregnation tank 2 forming die end member 21 end die body 22 auxiliary die 221 steps 4 cured laminate

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location B29L 31:24

Claims (1)

[Claims] 1. A curable resin-impregnated fiber material is laminated on a mold by winding and rewinding at the ends of the mold, the resin of the laminate is cured, and the end of the cured product is cut and removed. A method for producing a fiber-reinforced resin laminate, wherein in the method, an auxiliary mold having a step is continuously provided at an end of a molding die, and the resin-impregnated fiber material is rewound in the auxiliary mold.