JP2011079283A - Joining method of cylindrical member, molding method of cylindrical molding, and molding - Google Patents

Abstract

The present invention provides a method for joining cylindrical members that are free from wrinkles, have a good appearance, and retain strength, and a method for molding a cylindrical molded body.
A step of disposing a reinforcing fiber base material 2 by superimposing the above-mentioned joining and forming methods on the joint portion of the end faces of the pipes that are butted together, and covering the reinforcing fiber base material 2 with a sealing material to form a resin pipe Including a step of sealing to one outer peripheral surface, a step of reducing pressure between the outer peripheral surface of the resin tube 1 and a sealing material, supplying an uncured resin, and a step of curing the supplied resin, The reinforcing fiber base 2 is a plurality of sheet-like objects disposed while shifting the positions in the circumferential direction and the lateral direction along the outer peripheral surface of the joint portion, and one end in the circumferential direction is bonded to the other in the circumferential direction. The ends are disposed so as to overlap the outer surface of another adjacent sheet-like material, and are overlapped along the circumferential direction of the joint portion.
[Selection] Figure 1

Description

  The present invention relates to a method for joining cylindrical members, a method for forming a cylindrical molded body, and a molded body.

  Fiber-reinforced resin molded bodies have been widely used because they are lightweight and have high strength. For forming the tubular body, a hand lay-up molding method, a filament winding method, and a sheet winding method are generally used. In the hand lay-up molding method, the mold is manually impregnated with a brush or roller and laminated to a predetermined thickness while defoaming. The filament winding method impregnates continuous fibers with resin. In the sheet winding method, a rotating mandrel (which is often made of a cylindrical metal) is wound at an appropriate winding angle and formed into a predetermined shape (see, for example, Patent Document 1). A woven fabric of the reinforcing fibers thus obtained is wound helically around the core material, and the woven fabric is impregnated with resin and cured (see, for example, Patent Document 2).

  However, since these molding methods are wound around a mold while impregnating a fluid liquid resin into a reinforcing fiber, the resin is not yet solidified and cannot be confirmed by direct contact. It is difficult to control the thickness, and if a curing agent is mixed, the curing progresses over time, so the work cannot be interrupted. This is not preferable and expensive, and there is a problem that styrene or the like is volatilized during the production.

On the other hand, in recent years, various vacuum injection molding methods have been proposed in which molding is performed under reduced pressure such as by vacuum suction.
The basic technique of this vacuum injection molding method is disclosed in, for example, Patent Document 3, in which a fiber layup layer is disposed in a mold and an injection pipe for resin distribution is disposed thereon. And then encapsulating with a bag film, sealing the periphery of the bag film, and injecting resin into the vacuum-sucked bag film to form a molded product. In addition, a reinforcing fiber base material is arranged, and a resin diffusion material is appropriately provided through a release material, and this is covered with a bag film, sealed, and the interior covered with the bag film is placed in a vacuum reduced pressure state so that the resin is placed in the bag film. There is a molding method for forming a molded product by injection (for example, see Patent Documents 4 and 5).

  However, there are various problems in using such a vacuum injection molding method for fiber-reinforced resin tubular bodies, particularly fiber-reinforced resin cheeses. For example, when a rotating cylinder type / cylindrical product is coated in a dry state without impregnating resin with the required amount of reinforcing fiber and the required wall thickness, the sheet-like reinforcing fiber is wrapped around the cylindrical type / cylindrical product as it is to create a vacuum. The excessively compressed portion of the fiber is wrinkled in the axial direction, and this wrinkle not only deteriorates the appearance of the molded product but also decreases the strength.

Japanese Patent Publication No. 06-26858 JP 2007-136997 A JP-A-10-504001 JP 2002-307463 A JP-A-60-83826

  SUMMARY OF THE INVENTION An object of the present invention is to provide a method for joining cylindrical members and a method for forming a cylindrical molded body that are free from wrinkles, have good appearance, and retain strength.

  As a result of earnest research to solve the above-mentioned problems, the present inventors reinforce the joined portion of the substantially cylindrical member by infusion molding using a predetermined reinforcing fiber base material in the joining method and molding method. Was found to contribute to solving the problem, and the present invention was made based on this finding.

That is, according to the first invention of the present invention, a cylindrical member joining method for joining the end faces of substantially cylindrical members by abutting each other,
A step of disposing the reinforcing fiber base material along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that face each other and across the outer peripheral surfaces of the cylindrical members;
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects disposed while shifting the position in the circumferential direction and the lateral direction along the outer peripheral edge surface of the joint portion, and one end in the circumferential direction is bonded to the circumferential direction. A cylindrical member joining method is provided in which the other end of the cylindrical member is disposed so as to overlap the outer surface of another adjacent sheet-like material, and is overlapped along the circumferential direction of the joint portion. .

Moreover, according to the second invention of the present invention, the joining method of the cylindrical member that abuts and joins the end faces of the substantially cylindrical members,
A step of disposing the reinforcing fiber base material along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that face each other and across the outer peripheral surfaces of the cylindrical members;
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects having a plurality of types of width dimensions arranged while shifting the position in the circumferential direction along the outer peripheral surface of the joint portion, and bonds one end in the circumferential direction. A cylindrical member joining method, wherein the other end in the circumferential direction is disposed so as to overlap the outer surface of another adjacent sheet-like material, and is overlapped along the circumferential direction of the joining portion. Is provided.

  According to the third invention of the present invention, in the first or second invention, the sheet-like material is arranged in a circumferential direction with respect to one end of each sheet-like material with respect to the other end of the other sheet-like material overlapped. There is provided a joining method characterized by being arranged so as to be displaced from each other.

  According to a fourth invention of the present invention, in any one of the first to third inventions, the sheet-like product is characterized in that the circumferential length thereof is aligned to a predetermined length. A method is provided.

  According to a fifth invention of the present invention, in any one of the first to fourth inventions, the sheet-like material has a length in the circumferential direction of about 1/2 to 1 with respect to an outer peripheral length of the joint portion. A joining method is provided that is in the range of / 16.

  According to a sixth invention of the present invention, in any one of the first to fifth inventions, the tube end surface of the resin tube is cut in an oblique direction, the tube end surfaces are butted and joined in a bent form. A joining method is provided.

  According to the seventh invention of the present invention, in any one of the first to sixth inventions, a release material or a resin diffusion member is further disposed on the reinforcing fiber base layer, or the release material and the resin. There is provided a joining method characterized in that the diffusing members are arranged in that order or vice versa.

  According to an eighth aspect of the present invention, in the seventh aspect, the release material is laid on the reinforcing fiber base layer, and the resin diffusion member is further laid on the release material. A joining method is provided.

According to the ninth aspect of the present invention, the reinforcing fiber base material is disposed along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that are butted and straddling the outer peripheral surfaces of the cylindrical members. And a process of
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects disposed while shifting the position in the circumferential direction and the lateral direction along the outer peripheral edge surface of the joint portion, and one end in the circumferential direction is bonded to the circumferential direction. The other end of the cylindrical member is disposed so as to overlap the outer surface of another adjacent sheet-like material, and is laminated along the circumferential direction of the joint portion. The

According to the tenth aspect of the present invention, the reinforcing fiber base material is disposed along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that are butted across the outer peripheral surfaces of the cylindrical members. And a process of
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects having a plurality of types of width dimensions arranged while shifting the position in the circumferential direction along the outer peripheral surface of the joint portion, and bonds one end in the circumferential direction. And forming the cylindrical molded body, wherein the other end in the circumferential direction is arranged so as to overlap the outer surface of another adjacent sheet-like material, and is overlapped along the circumferential direction of the joint portion. A method is provided.

  According to an eleventh invention of the present invention, in the ninth or tenth invention, the sheet-like material is arranged in a circumferential direction with respect to the other end of the other sheet-like material overlapping one end of each sheet-like material. A molding method is provided, wherein the molding method is arranged such that the positions of the two are shifted.

  According to a twelfth aspect of the present invention, in any one of the ninth to eleventh aspects, the sheet-like material has a circumferential length aligned to a predetermined length. A method is provided.

  According to a thirteenth aspect of the present invention, in any one of the ninth to twelfth aspects, the sheet-like material has a length in the circumferential direction of about 1/2 to 1 with respect to the outer circumferential length of the joint. A molding method is provided that is in the range of / 16.

  According to a fourteenth aspect of the present invention, in any one of the ninth to thirteenth aspects, the end surface of the substantially cylindrical member is cut in an oblique direction, the end surfaces are butted together and joined in a bent form. A molding method is provided.

  According to the fifteenth aspect of the present invention, in any one of the ninth to fourteenth aspects, a release material or a resin diffusion member is further disposed on the reinforcing fiber base layer, or the release material and the resin. There is provided a molding method characterized in that the diffusing members are arranged in that order or vice versa.

  According to a sixteenth aspect of the present invention, in the fifteenth aspect, the release material is laid on the reinforcing fiber base layer, and the resin diffusion member is further laid on the release material. A molding method is provided.

  According to a seventeenth aspect of the present invention, in any one of the ninth to sixteenth aspects, the cylindrical member is rotatably provided with a direction intersecting the end face as a rotation axis. A forming method is provided.

  According to the eighteenth aspect of the present invention, there is provided a molded body obtained by any of the ninth to seventeenth molding methods.

  According to a nineteenth aspect of the present invention, there is provided the molded body according to the eighteenth aspect, wherein the molded body is a bent shape, a branched shape or a different diameter shape.

  According to a twentieth aspect of the present invention, in the nineteenth aspect, there is provided a molded body characterized in that the molded body has an elbow shape or a cheese shape.

  According to a twenty-first aspect of the present invention, there is provided the molded body according to any of the eighteenth to twentieth aspects, wherein the molded body is a pipe joint.

  According to a twenty-second aspect of the present invention, there is provided a molded body according to the twenty-first aspect, wherein the pipe joint is an elbow, a cheese, a cross tube or a reducer.

  According to the joining method and the molding method of the present invention, it is possible to confirm the measurement by directly touching whether the thickness is a predetermined thickness, and if the trouble occurs before supplying the resin, the work can be interrupted. Since the resin is injected into the cover, there is no vaporization scattering of the solvent in the resin, the working environment is improved, and the generation of wrinkles at the time of molding, particularly at the time of molding with a rotary mold, can be suppressed. Appearance can be improved and strength can be maintained.

In Example 1, it is a schematic diagram which shows the state which faced cylindrical members in those end surfaces. 1 is a schematic diagram of an elbow-shaped molded body obtained in Example 1. FIG. 1 is a schematic diagram of an example of a reinforcing fiber base used in Example 1. FIG. It is a schematic diagram which shows the state which wound the reinforced fiber base material of FIG. 3 is a schematic diagram illustrating an example of an arrangement mode of various members used in Example 1. FIG. 6 is a schematic diagram of another example of a reinforcing fiber base used in Example 2. FIG. It is a schematic diagram which shows an example of the arrangement | positioning aspect of a reinforced fiber base material. It is a schematic diagram of another example of the arrangement | positioning aspect of a reinforced fiber base material.

In the joining method of the present invention, first, the reinforcing fiber base material is disposed along the outer peripheral surface of the joined portion at the end face of the substantially cylindrical member that is abutted, and straddling the outer peripheral surface of the cylindrical members. Next, after covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface, the pressure between the outer peripheral surface and the sealing material is reduced, a flowable resin is sucked and injected, and the injected resin is cured. Or it is solidified.
And in the joining method of the present invention, the reinforcing fiber base is a plurality of sheet-like materials disposed along the outer peripheral surface of the joined portion, and one end in the circumferential direction is bonded to the circumferential direction. The other end is disposed so as to overlap the outer surface of another adjacent sheet-like material, and is disposed in a substantially windmill shape so as to be overlapped along the circumferential direction of the joint portion.
Examples of the reinforcing fiber base material include a sheet-like material cut to a predetermined length, and the sheet-like material has a configuration in which a binder is wound directly around the outer peripheral surface of the cylindrical member. It may be a thing.
Arrangement of the sheet-like material is performed while shifting the position in the circumferential direction and the lateral direction, or a plurality of sheet-like materials having a plurality of types of width dimensions (preferably with slightly different widths) are used. 7 and 8 is preferably performed while shifting the position in the circumferential direction, preferably both are laminated so that both end faces are gentle as shown in FIGS. 7 and 8, and the necessary width is secured in the central part as a whole. It arrange | positions so that it may reduce thickness gradually toward the side.
As the size of the sheet-like material, for example, one having a size corresponding to the length obtained by dividing the outer peripheral length of the outer peripheral surfaces of the cylindrical members from about 2 to 6 or higher order (for example, 7 to 16, (7 to 50 divisions) and the like overlapping multiple times.

  In the joining method of the present invention, preferably, a release material or a resin diffusion member is further disposed on the reinforcing fiber base layer, or the release material and the resin diffusion member are disposed in that order or in the reverse order. It is good to do.

  Examples of the reinforcing fibers constituting the reinforcing fiber base include glass fibers, carbon fibers, and aramid fibers. Examples of the reinforcing fiber base include knitted fabrics such as glass cloth, carbon cloth, and kevlar cloth, and non-woven fabrics. , Chopped strand mat, fiber stitch material, reinforced fiber knitted fabric and cotton-like sandwich structure material, etc. In addition, a plurality of sheet-like outer layer base materials arranged along the outer peripheral surface of the cylindrical member Each outer layer base material is disposed such that one end in the circumferential direction is bonded and the other end in the circumferential direction is overlapped with the outer surface of another adjacent outer layer base material in the circumferential direction of the cylindrical member. In this case, the plurality of outer layer base materials have one end of each outer layer base material in the circumferential direction with respect to the other end of the other outer layer base material overlapped. position The size of the cylindrical member is preferably such that the outer peripheral length of the cylindrical member corresponds to a length obtained by dividing the outer peripheral length of the cylindrical member by about 2 to 6, or a higher order (for example, 8). ˜16 divisions) and overlapped multiple times.

The mold release material enhances the mold release property of the solidified injection resin, and a sheet made of the injection resin and a non-adhesive material is preferable.
The resin diffusing member promotes the diffusion of the injected resin. The resin diffusing member can impregnate the reinforcing resin into the reinforcing fiber base without unevenness, and can diffuse the injected resin over the entire desired range on the cylindrical member. The sheet material is preferable.
The resin diffusion member may not be used as long as it can be molded depending on conditions such as the type and thickness of the reinforcing fiber substrate.

  Next, a reinforcing fiber base layer is added, or further, a release material and a resin diffusion member are airtightly covered with a bag film on the cylindrical member. The bag film is not particularly limited as long as it is an airtight synthetic resin film material generally used in this type of vacuum injection molding method. And as for a bag film, it is preferable to adhere a bag film to the surface of a cylindrical member using sealing materials, such as an adhesive material, in the peripheral part of a cylindrical member. Thereby, between a cylindrical member and a bag film can be comprised as an airtight and airtight molded part.

  Then, after connecting the decompression line that decompresses the inside of the bag film, that is, the interior covered with the bag film, and the injection line that injects the resin into the bag film, the fluid resin is sucked and injected into the bag film under reduced pressure. And the resin is solidified. Examples of the decompression line include those having a decompression suction port attached to a vacuum pump. As this injection resin, for example, a low-viscosity vinyl ester resin, unsaturated polyester resin, vinyl ester resin, epoxy resin, phenol resin, isocyanate resin, bismaleimide resin and the like are preferable. Examples of the injection line include those in which a resin injection port is connected to a connector for supplying resin from a resin storage tank, and those in which a resin injection hose is inserted into a bag film and in contact with a resin diffusion member. Is preferably carried out after confirming that a predetermined vacuum pressure has been reached and there are no wrinkles. After the resin is injected, heat is applied when a thermosetting resin is used, or the resin is cured and molded when a curing agent is added to the resin. Moreover, when using a thermoplastic resin, after inject | pouring resin heated until it liquefies, a cylindrical member is cooled and resin is solidified.

Further, the present invention is a step of disposing the reinforcing fiber substrate along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that are butted across the outer peripheral surfaces of the cylindrical members,
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects arranged along the outer peripheral edge surface of the joint portion, one end in the circumferential direction is bonded, and the other end in the circumferential direction is adjacent to another sheet. The cylindrical shaped body can be formed by being arranged so as to overlap the outer surface of the shaped article and being overlapped along the circumferential direction of the joining portion. The detailed mode, such as the same, is the same as that of the joining method.
In such a molding method, the cylindrical member may be rotatably provided with a direction intersecting the end surface as a rotation axis.

The shaped body thus obtained is not particularly limited in shape and the like, but preferably has a bent shape, a branched shape or a different diameter shape, such as an elbow shape or a cheese shape.
Moreover, although a molded object can be used for a wide variety of uses, Preferably a pipe joint etc. are mentioned.
Examples of the pipe joint include an elbow, cheese, a cross tube, or a reducer.

  Hereinafter, the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to these drawings.

Example 1
In FIG. 3, reference numeral 2 denotes a reinforcing fiber base disposed on the cylindrical member 1, which consists of an inner layer base 21 and an outer layer base 22, and the inner layer base 21 is an outer periphery of the cylindrical member. It is a binder that is directly wound around the surface. For example, a reinforcing fiber material is stitched into a chopped strand mat shape, and is preferably a base material formed in a sheet shape. The inner layer base material 21 by the stitch base material of such a chopped strand mat has shape retainability by the force of the stitch yarn, and is excellent in followability to the outer peripheral surface of the cylindrical member. The outer layer base material 22 is a plurality of sheet-like materials disposed on the outer diameter side of the inner layer base material 21, and a roving formed by aligning fiber strands in which reinforcing fiber filaments are bundled is used as a weft. It is preferably a sheet-like fiber base material used as a woven or non-woven fabric.
Of such reinforcing fiber base material 2, the inner layer base material 21 is first disposed along the circumferential surface of the cylindrical member 1.

  Subsequently, as shown in FIGS. 3 and 4, a plurality of sheet-like outer layer base materials 22 are overlapped along the outer peripheral surface of the inner layer base material 21 in the circumferential direction while being wound in order.

The outer layer base material 22 is formed by cutting to a prescribed length according to the outer diameter of the cylindrical member 1. In the illustrated embodiment, the outer layer base material 22 is cut into a size corresponding to a length obtained by dividing the outer peripheral length of the cylindrical member 1 from about 2 to 6 parts. It is formed in a rectangular shape having a size substantially equal to the width, and is overlaid in the circumferential direction of the cylindrical member 1.
One end side in the circumferential direction of each layered outer layer base material 22 is bonded and fixed to the inner layer base material 21, and the other end side in the circumferential direction is not bonded to the inner layer base material 21.

  As shown in FIG. 3, the outer layer base material 22 is wound around the outer surface of the inner layer base material 21 wound earlier so as to dispose a plurality of outer layer base materials 22 in the circumferential direction. Specifically, one outer layer base material 22 is set in the circumferential direction along the outer peripheral surface of the cylindrical member 1, and one end side in the circumferential direction of the outer layer base material 22 is set to the outer surface of the inner layer base material 21. Glue and fix. Further, the other end side in the circumferential direction of the outer layer base material 22 is not adhered and is placed along the outer shape of the cylindrical member 1 as it is. Similarly, the outer layer base material 22 to be subsequently disposed is bonded to the outer surface of another adjacent outer layer base material 22 without adhering the other end side to the inner layer base material 21 while adhering one end side thereof in the circumferential direction. It arrange | positions so that it may overlap. For arranging and fixing the reinforcing fiber base 2, spray glue, an adhesive, an adhesive, or the like can be used for both the inner layer base 21 and the outer layer base 22.

  In this way, a plurality of outer layer base materials 22 are overlaid on the outer surface of the inner layer base material 21, as shown in FIG. The outer layer base material 22 is laminated in order while shifting the arrangement position by a certain amount in the circumferential direction. It is desirable to secure a length of 1/10 or more of the length of one outer layer base material 22 for the overlap w with the other adjacent outer layer base materials 22 when the outer layer base material 22 is laminated. . In addition, the arrangement position where the outer layer base materials 22 are not overlapped and the end portions are in contact with each other or separated from each other is not preferable for obtaining the strength of the outer layer base material 22. Thereby, the predetermined thickness can be secured and the reinforcing fiber base 2 can be laminated.

  Next, the stretchable nonwoven fabric 3 is overlapped and wound around the outer surface of the laminated outer layer base material 22, and the stretchable nonwoven fabric 3 is made up of the plurality of outer layer base materials 22 through the inner layer base material 21. It is fixed to the outer peripheral surface. Although the outer layer base material 22 is bonded and fixed only at one end side in the circumferential direction, the outer layer base material 22 is pressed by the stretchable nonwoven fabric 3 and can stably maintain a laminated state. Moreover, since the other end side of the outer layer base material 22 in the circumferential direction is merely superimposed on the adjacent outer layer base material 22, when the nonwoven fabric 3 is wound around, the cylindrical member 1 does not cause unnecessary wrinkles. It is fixed along the outer periphery.

  Subsequently, the release cloth 4 is placed on the outer surface of the wound nonwoven fabric 3.

  Further, a resin diffusion member 5 is disposed on the outer surface of the wound release cloth 4.

  An injection resin injection tube 7 is disposed outside the resin diffusion member 5. The arrangement of the injection tube 7 is appropriate, but it is preferably provided near the tube bottom of the cylindrical member 1. As the injection pipe 7, there is a rubber pipe or the like, which is passed through the bag film 6 and connected to the resin diffusion member 5.

  In addition, a decompression line is disposed in the molding portion covered with the bag film 6. The decompression line is connected to a decompression source via a hose such as a rubber tube. Further, a plurality of injection tubes 7 may be arranged on the outer surface of the resin diffusion member 5 at appropriate intervals according to the size of the cylindrical member 1 and the like.

  Next, the release member 4, the resin diffusion member 5, and the cylindrical member 1 provided with the injection pipe 7 are covered with a bag film 6 in an airtight manner. Then, the bag film 6 is fixed to the surface of the cylindrical member 1 on the periphery of the cylindrical member using a sealing material such as an adhesive material or a sealing tape. Thereby, between the cylindrical member 1 and the bag film 6 can be comprised as a shaping | molding part sealed airtightly. In addition, a reduced pressure source that sucks and decompresses air in the molded part is connected to the molded part covered with the bag film 6.

  In injecting the resin, the inside of the bag film 6 is depressurized by a connected depressurization source, and is brought into a substantially vacuum state. At this time, it is confirmed that wrinkles are not generated in the laminated reinforcing fiber base material 2 (particularly, the outer layer base material 22). The outer layer base material 22 in a state in which a plurality of sheets are laminated is only fixed at one end side in the circumferential direction and not fixed at the other end side in the circumferential direction. Even if it acts so as to generate wrinkles in the base material 22, it is possible to escape the wrinkles to the non-adhered other end side of the outer layer base material 22, and as a result, generation of wrinkles can be effectively prevented. At this time, whether or not the reinforcing fiber base 2 has a predetermined thickness can be directly touched to measure and confirm. Also, if there is a problem as a result of confirmation, the operation can be interrupted and corrected at the stage before resin injection.

  And in this pressure reduction environment, resin is inject | poured from the injection tube 7, and is spread | diffused inside the bag film 6 (inside a shaping | molding part). The injected resin is uniformly diffused through the resin diffusion member 5 and impregnated into the nonwoven fabric 3 and the reinforcing fiber base 2.

When the resin injection is completed, the injected resin can be solidified while maintaining the reduced pressure state in the molded part, and thereby, the impregnation can be integrated with the reinforcing fiber material.
Specifically, for example, when the diameter of the cylindrical member 1 is 500 mm, the required number of laminated sheets is 10, and the reinforcing fiber substrate length is 1/4 of the circumferential length, the circumferential length ≈ 1570, the reinforcing fiber substrate The length = 1570 / 4≈393, the reinforcing fiber base end face shift margin (pitch) = 393/10 = 39.3, and the 393 mm long reinforcing fiber base is shifted by 39.3 mm and pasted. 10 × 4 = 40 sheets are pasted around.
In addition, as a method of laminating in a substantially windmill shape, when reinforcing fiber bases of the same width cut to a predetermined length are laminated while being shifted in the circumferential direction, there are steps corresponding to the thickness at both ends of the cylindrical tube and the laminated portion. In the case of a high-pressure cylindrical tube, stress concentration is a concern.
As a method of avoiding this, as shown in FIGS. 7 and 8, when reinforcing fiber bases having different widths are sequentially laminated, or when reinforcing fiber bases having the same width are sequentially shifted in the width direction, The end becomes a gentle thickness and stress concentration is avoided.
For example, 300 mm wide and 500 mm long reinforcing fiber base materials are laminated by shifting 5 sheets to the left sequentially every 10 mm, further laminating by shifting 10 sheets every 10 mm to the right, and laminating by shifting 10 mm to the left, When laminated to a predetermined thickness, the total width is 400 mm, and the left and right 50 mm widths are gradually reduced in thickness, resulting in gentle end portions.
Furthermore, as practiced by a conventional hand lay-up molding method or the like, it is also effective in infusion molding to laminate reinforcing fiber bases having different widths sequentially.

  In this manner, the cylindrical members can be joined to each other, and an elbow-type cylindrical molded body can be formed.

(Example 2)
The molding method described in the present embodiment has the same basic configuration as that of the first embodiment and is characterized by the arrangement of the outer layer base material 22 of the reinforcing fiber base 2. The configuration will be described in detail, and the description of other configurations will be omitted using the same reference numerals as in the first embodiment.

  FIG. 6 is a schematic diagram showing another example of the reinforcing fiber base corresponding to FIG. 3.

  In this embodiment, a large number of sheet-like outer layer base materials 22 are laminated on the outer surface of the inner layer base material 21 disposed along the outer peripheral surface of the cylindrical member 1 to form a multilayer structure. While increasing the wall thickness, a uniform outer peripheral surface is formed.

  Also in this case, the plurality of sheet-like outer layer base materials 22 are sequentially laminated while being shifted by a certain amount in the circumferential direction of the cylindrical member 1. At this time, one end side in the circumferential direction of each outer layer base material 22 is adhered and fixed to the inner layer base material 21, and the other end side in the circumferential direction is not adhered to the inner layer base material 21 in Example 1. It is the same.

  As shown in FIG. 6, each outer layer base material 22 is overlapped on the outer surface of the inner layer base material 21 wound earlier, and when the plurality of outer layer base materials 22 are respectively arranged in the circumferential direction, other outer layers adjacent to each other. The overlap w with the base material 22 is larger than that in the second embodiment. That is, when one outer layer base material 22 is disposed, the amount of shifting with respect to the other adjacent outer layer base materials 22 is reduced, and a large overlapping area is ensured.

  In addition, in the laminated state of the outer layer base material 22 that is a multilayer, the end position of the outer layer base material 22 in the circumferential direction matches the end position of the outer layer base material 22 in any other layer in the circumferential direction. The form is not preferred because there is a risk of strength reduction in the matched part. Therefore, as shown in FIG. 6, one end portion a in the circumferential direction of any outer layer base material 22 and the other end portion b of any other outer layer base material 22 are in a position shifted in the circumferential direction. Arrange as follows. And it is preferable to secure a certain amount of overlap margin w between the outer layer base materials 22 over the entire outer periphery of the cylindrical member 1.

  Thereby, it is possible to easily stack a large number of outer layer base materials 22 to ensure the thickness, and to form a joint portion having an equal thickness. The stretchable nonwoven fabric 3 is wound around the outer surface of the outer layer base material 22 as a next step.

  In addition, when injecting the resin, the cylindrical member 1 provided with the nonwoven fabric 3, the release cloth 4 and the like is air-tightly covered with the bag film 6 as in the first embodiment. The outer layer base material 22 in a state where a large number of sheets are laminated is only fixed at one end side in the circumferential direction, and is not fixed at the other end side in the circumferential direction. A wrinkle can be escaped in the direction shown by the arrow in FIG. As a result, generation of wrinkles can be effectively prevented. At this time, whether or not the reinforcing fiber base 2 has a predetermined thickness can be directly touched to measure and confirm. Also, if there is a problem as a result of confirmation, the operation can be interrupted and corrected at the stage before resin injection.

  The method of the present invention is a bonded cylindrical molded body having no trouble of vaporization and scattering of solvent, styrene, etc. in the resin, improved working environment, no generation of wrinkles, good appearance and strength. It can be manufactured and is very useful in industry.

DESCRIPTION OF SYMBOLS 1 Cylindrical member 2 Reinforcement fiber base material 21 Inner layer base material 22 Outer layer base material 3 Nonwoven fabric 4 Release cloth 5 Resin diffusion member 6 Bag film 7 Injection tube

Claims (22)

A cylindrical member joining method for joining the end faces of substantially cylindrical members together,
A step of disposing the reinforcing fiber base material along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that face each other and across the outer peripheral surfaces of the cylindrical members;
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects disposed while shifting the position in the circumferential direction and the lateral direction along the outer peripheral edge surface of the joint portion, and one end in the circumferential direction is bonded to the circumferential direction. The other end of the cylindrical member is disposed so as to overlap the outer surface of the other adjacent sheet-like material, and is superposed along the circumferential direction of the joint portion. A cylindrical member joining method for joining the end faces of substantially cylindrical members together,
A step of disposing the reinforcing fiber base material along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that face each other and across the outer peripheral surfaces of the cylindrical members;
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects having a plurality of types of width dimensions arranged while shifting the position in the circumferential direction along the outer peripheral surface of the joint portion, and bonds one end in the circumferential direction. A cylindrical member joining method, wherein the other end in the circumferential direction is disposed so as to overlap the outer surface of another adjacent sheet-like material, and is overlapped along the circumferential direction of the joining portion. .   The said sheet-like object is arrange | positioned so that the position of the circumferential direction may shift | deviate with respect to the other end of the other sheet-like object which overlapped one end of each sheet-like object. Joining method.   The joining method according to any one of claims 1 to 3, wherein the sheet-like material has a circumferential length aligned to a predetermined length.   5. The sheet-like material according to claim 1, wherein a length in a circumferential direction of the sheet-like material is in a range of about ½ to 1/16 with respect to an outer peripheral length of the joint portion. Joining method.   6. The joining method according to claim 1, wherein the end surface of the substantially cylindrical member is cut in an oblique direction, the end surfaces are butted and joined in a bent form.   Furthermore, a mold release material or a resin diffusion member is arrange | positioned on a reinforced fiber base material layer, or a mold release material and a resin diffusion member are arrange | positioned in the order or its reverse order. The joining method according to the above.   The joining method according to claim 7, wherein a release material is laid on the reinforcing fiber base layer, and a resin diffusion member is further laid on the release material. A step of disposing the reinforcing fiber base material along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that face each other and across the outer peripheral surfaces of the cylindrical members;
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects disposed while shifting the position in the circumferential direction and the lateral direction along the outer peripheral edge surface of the joint portion, and one end in the circumferential direction is bonded to the circumferential direction. A method for forming a cylindrical molded body, characterized in that the other end of the cylindrical body is disposed so as to overlap the outer surface of another adjacent sheet-like material, and is overlapped along the circumferential direction of the joint portion. A step of disposing the reinforcing fiber base material along the outer peripheral surface of the joined portion of the end surfaces of the substantially cylindrical members that face each other and across the outer peripheral surfaces of the cylindrical members;
Covering the reinforcing fiber substrate with a bag film and sealing the outer peripheral surface;
Reducing the pressure between the outer peripheral surface and the sealing material, and sucking and injecting a fluid resin;
Curing or solidifying the injected resin,
The reinforcing fiber base is a plurality of sheet-like objects having a plurality of types of width dimensions arranged while shifting the position in the circumferential direction along the outer peripheral surface of the joint portion, and bonds one end in the circumferential direction. And forming the cylindrical molded body, wherein the other end in the circumferential direction is arranged so as to overlap the outer surface of another adjacent sheet-like material, and is overlapped along the circumferential direction of the joint portion. Method.   The said sheet-like object is arrange | positioned so that the position of the circumferential direction may shift | deviate with respect to the other end of the other sheet-like object which overlapped one end of each sheet-like object. Molding method.   The molding method according to any one of claims 9 to 11, wherein the sheet-like material has a circumferential length aligned to a predetermined length.   13. The sheet according to claim 9, wherein the sheet-like material has a circumferential length in a range of about 1/2 to 1/16 of the outer circumferential length of the joint. Molding method.   The molding method according to claim 9, wherein an end surface of the substantially cylindrical member is cut in an oblique direction, and the end surfaces are butted and joined in a bent form.   Furthermore, a release material or a resin diffusion member is disposed on the reinforcing fiber base layer, or the release material and the resin diffusion member are disposed in that order or in the reverse order. The molding method of crab.   The molding method according to claim 15, wherein a release material is laid on the reinforcing fiber base layer, and a resin diffusion member is further laid on the release material.   The molding method according to claim 9, wherein the cylindrical member is rotatably provided with a direction intersecting the end surface as a rotation axis.   The molded object obtained by the shaping | molding method in any one of Claims 9-17.   The molded body according to claim 18, wherein the molded body has a bent shape, a branched shape, or a different diameter shape.   20. The molded body according to claim 19, wherein the molded body has an elbow shape or a cheese shape.   The molded body according to any one of claims 18 to 20, wherein the molded body is a pipe joint.   The molded body according to claim 21, wherein the pipe joint is an elbow, a cheese, a cross tube or a reducer.

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