JP5273978B2 - Fiber reinforced resin hollow body - Google Patents

Description

  The present invention relates to a hollow body made of a fiber reinforced resin used for a structural material or the like.

  Conventionally, a hollow body made of fiber reinforced resin has been used as a material for a structure that requires light weight, high strength, and high rigidity. For example, robot arms and breaker bars are good examples.

  As a hollow body made of fiber reinforced resin, Patent Document 1 discloses a method for manufacturing a hollow door in which two L-shaped members are joined with an adhesive. However, in this hollow body, the joint surfaces directly joining the members are limited to the ends of both L-shaped members. Since the hollow body made of fiber reinforced resin is a structure intended to be lightweight and high in strength, it is required to make the member for forming the hollow body as thin as possible. Therefore, in the technique of Patent Document 1, since the joint surface becomes smaller as the member is made thinner, high joint strength cannot be obtained.

  Therefore, a means for widening the joint surface when forming the hollow body is necessary. For example, a first member in which a long bottom plate portion and side plate portions vertically rising from the bottom plate portion along the longitudinal direction of the bottom plate portion are provided on both sides in the width direction of the bottom plate portion, and the first member It is conceivable that a second member of the same shape, which is in close contact with the inner side, is fitted in the opposite direction and joined with an adhesive to obtain a hollow body. In such a hollow body, since the surface of the side plate portion of each member can be used as a joint surface, the joint surface does not decrease even if the member is thinned, and thus high joint strength is expected.

However, in this case, there is a problem that the adhesive applied to the joint surface is scraped off by the members. This is because the entire joint surfaces of the two members cannot be brought into contact at the same time. That is, since the ends of the joining surfaces must be brought into contact with each other first and then the members are fitted into each other, the adhesive applied to the joining surface is scraped off by the members. Therefore, even if a wide bonding surface is provided by such a method, high bonding strength cannot be expected.
JP 2004-339778 A

  Therefore, the present invention provides a fiber reinforced resin hollow body in which two members are bonded with high bonding strength.

In order to solve the above problems, the present invention rises from the flat plate of the first member when the hollow member is formed by joining the first member made of flat fiber-reinforced resin and the first member. The second member made of fiber reinforced resin having a wall body is a joined fiber reinforced resin hollow body, and the first member includes a flat plate body and one or more ridges on one side of the flat plate body. When the outer surface of the ridge is joined to the second member, it is inclined so as to be in close contact with the inner surface of the wall of the second member, the flat plate body is a prepreg, and the ridge is a carbon fiber sheet. The second member is formed using a molding compound, and the second member is inclined inward as the inner side surface of the wall body moves away from the flat plate main body of the first member, A hollow body made of fiber reinforced resin, in which the inner surface of the member 2 is bonded via an adhesive, is provided. To.

  According to the present invention, it is possible to provide a fiber-reinforced resin hollow body in which two members are bonded with high bonding strength.

  Hereinafter, based on FIG.1 and FIG.2, one Embodiment of the fiber reinforced resin hollow body (it may abbreviate as a hollow body hereafter) of this invention is described in detail.

In the hollow body 10 made of fiber reinforced resin, the first member 20 and the second member 30 are joined via an adhesive 41.
The first member 20 includes a long flat plate body 21 and ridges 22 and 23 having a triangular cross section provided on both sides in the width direction of the flat plate body 21 along the longitudinal direction of the flat plate body. Further, the outer surfaces 24 and 25 of the ridges are inclined. The angles α ₁ and β ₁ formed by the outer surfaces 24 and 25 of the ridges and the vertical direction of the flat plate body 21 are each preferably 3 ° to 60 °, and more preferably 5 ° to 15 °. . If the inclination angles α ₁ and β ₁ are 3 ° or more, it is easy to prevent the adhesive from being scraped off when the members are joined to each other. Moreover, if the inclination angles α ₁ and β ₁ are 60 ° or less, it is easy to form a hollow body having a sufficient hollow space.

When the second member 30 is joined to the first member 20 to form a hollow body, the long side plate portions 31 and 32 that form the wall of the hollow body 10, and the side plate portion 31 and the side plate portion 32 has a long bottom plate portion 33 provided between them. In the hollow body 10 of the present embodiment, the bottom plate portion 33 includes a bottom plate portion 33a parallel to the flat plate main body 21 of the first member 20, and bottom plate portions 33b at both ends in the width direction of the bottom plate portion 33a. 31 and 32 are provided so as to incline toward the side.
When the side plate portions 31 and 32 are joined to the first member 20, the side plate portions 31 and 32 are provided so as to be inclined inward as the distance from the flat plate body 21 of the first member increases. Accordingly, the inner side surface 34 and the inner side surface 35 are similarly inclined. The inclination angles of the inner side surfaces 34 and 35, that is, the angles α ₂ and β ₂ formed by the inner side surfaces 34 and 35 and the vertical direction of the inner bottom surface 36 (the inner side surface of the bottom plate portion 33a) are α ₁ and β ₁ , respectively. It is equivalent. Therefore, the inner side surface 34 can be in close contact with the outer side surface 24 of the ridge of the first member 20, and the inner side surface 35 can be in close contact with the outer side surface 25 of the ridge of the first member 20.

A production example of the hollow body 10 will be described.
First, a prepreg in which a reinforcing fiber is impregnated with a thermosetting resin is prepared. Next, one or more prepregs are stacked in a mold for molding the flat plate body 21. At the same time, a molding material such as a sheet molding compound (SMC) is disposed in a portion where the ridges 22 and 23 are formed. And these are shape | molded by the compression molding method and the 1st member 20 which has the protruding item | lines 22 and 23 is obtained.

  In addition, a single layer or a plurality of prepregs are stacked in a mold for molding the second member 30, and after bagging, autoclave molding is performed. Alternatively, the second member 30 can be obtained by placing one or more prepregs in a compression mold and then clamping and compression molding.

  Examples of the reinforcing fiber include carbon fiber, glass fiber, aramid fiber, boron fiber, silicon carbide fiber, high-strength polyethylene, polyparaphenylene benzobisoxazole (PBO) fiber, nylon fiber, and stainless steel fiber. However, carbon fiber is desirable because of its light weight and high rigidity. In addition, examples of the reinforcing fiber include long fibers and short fibers, and long fibers are preferable from the viewpoint of rigidity. Examples of the form of the long fiber include those arranged in one direction and woven fabric made of long fibers.

  Examples of the thermosetting resin include epoxy resins, vinyl ester resins, unsaturated polyester resins, polyimide resins, maleimide resins, and phenol resins. When carbon fiber is used as the reinforcing fiber, epoxy resin or vinyl ester resin is desirable from the viewpoint of adhesiveness with carbon fiber. The epoxy resin composition further preferably contains an elastomer component in addition to the epoxy resin component and the curing agent component. Examples of the elastomer component include Carboxy-Terminated Butadiene Acrylonitrile Copolymer (CTBN).

Next, the adhesive 41 is applied to the outer surfaces 24 and 25 of the ridges and the end surfaces 26 and 27 of the flat plate body in the width direction of the first member 20, and the fibers are bonded to the second member 30 and bonded to the fibers. A reinforced resin hollow body 10 is obtained.
Here, as the adhesive 41, for example, a two-component epoxy adhesive, a two-component urethane adhesive, a rubber reinforced methyl methacrylate, and a one-component epoxy adhesive can be used. Examples of the one-component adhesive include a product name; Scotch Weld 2214 manufactured by 3M Corporation.

Alternatively, an adhesive previously formed into a film shape can be used. Since the adhesive in the form of a film has a uniform thickness, it is difficult for unevenness in thickness to occur, and a stable bonding strength can be obtained by bonding at a predetermined bonding pressure.
Examples of the resin constituting the film-form adhesive include an epoxy resin, a polyester resin, and an acrylic resin, and an epoxy resin is preferable in terms of bonding strength. More preferably, the epoxy resin composition contains an epoxy resin component, a curing agent component, and an elastomer component. Examples of the elastomer component include CTBN.

In addition, it is preferable that the film-form adhesive includes a base material made of a nonwoven fabric or a woven fabric because the handling property and adhesive retention of the film-form adhesive are improved. Further, when stress is applied to the cured adhesive 41, even if a minute crack occurs, the progress of the crack can be suppressed, so that the strength of the adhesive 41 can be improved.
Polyester fiber, nylon fiber, aramid fiber, acrylic fiber, glass fiber, and the like can be used as the nonwoven fabric and woven material used for the adhesive 41, but the material is not limited thereto.

In the hollow body 10 described above, the outer side surfaces 24 and 25 of the first member and the inner side surfaces 34 and 35 of the second member are inclined. Therefore, when joining the 1st member 20 and the 2nd member 30, the outer surfaces 24 and 25 of the protruding item | line of a 1st member can make all the surfaces contact the 2nd member 30 simultaneously. . Therefore, the applied adhesive 41 is not scraped off by each other member.
Moreover, the hollow body 10 uses the outer side surface of the protruding item | line of the 1st member 20, and the inner side surface of the wall body of a 2nd member as a joint surface for joining each member. Therefore, even if the first member and the second member are designed to be thin, the joint surface can be widened. Therefore, a fiber-reinforced resin hollow body in which the members are joined with high joint strength can be produced.

  Next, another embodiment of the fiber-reinforced resin hollow body of the present invention will be described in detail with reference to FIGS.

The hollow body 50 made of fiber reinforced resin is obtained by bonding a first member 60 and a second member 70 via an adhesive 41.
The first member 60 includes a long flat plate body 61 and ridges 62 and 63 having a triangular cross section provided on both sides in the width direction of the flat plate body 61 along the longitudinal direction of the flat plate body. Further, the outer surfaces 64 and 65 of the ridges are inclined. It is desirable that the angles α ₃ and β ₃ formed by the outer surfaces 64 and 65 of the ridges and the vertical direction of the flat plate body 61 are in the range of 15 ° to 60 °. If the inclination angles α ₃ and β ₃ are within the above ranges, it is easy to prevent the adhesive from being scraped off, and a hollow body having a sufficient hollow space is easily formed.

The second member 70 includes long side plate portions 71 and 72 that form a hollow wall body. The inner side surfaces 73 and 74 of the side plate portions 71 and 72 are inclined at angles α ₄ and β ₄ with respect to the straight line 51 in the vertical direction of the flat plate body 61 of the first member. The inclination angles α ₄ and β ₄ are equivalent to α ₃ and β ₃ , respectively. Therefore, the inner side surface 73 can be in close contact with the outer side surface 64 of the ridge of the first member 60, and the inner side surface 74 can be in close contact with the outer side surface 65 of the ridge of the first member 60.
About the manufacturing method and material of the hollow body 50, the same thing as the case of the hollow body 10 can be used as it is.

  As for the hollow body 50, when the first member 60 and the second member 70 are joined, the outer surfaces 64 and 65 of the first member protrusions contact the second member 70 at the same time. Can be made. Therefore, the applied adhesive is not scraped off by each member, and even if the member is designed to be thin, the joining surface can be widened, so that the members are joined with high joining strength.

  In addition, the hollow body made from fiber reinforced resin of this invention is not restricted to what was mentioned above. For example, the bottom plate portion 33 (see FIGS. 1 and 2) of the second member 30 of the hollow body 10 may be composed of only the bottom plate portion 33 a parallel to the flat plate body 21 of the first member 20. Moreover, as shown in FIG.5 and FIG.6, as for the 2nd member which forms a hollow body, if the inner surface inclines, wall body itself does not need to incline.

In the fiber reinforced resin hollow body 110, the first member 120 and the second member 130 are joined via an adhesive 41.
The first member 120 includes a long flat plate main body 121 and ridges 122 and 123 having a triangular cross section provided on the flat plate main body 121 along the longitudinal direction of the flat plate main body. The outer surfaces 124 and 125 of the ridges are inclined. The angles α ₅ and β ₅ formed by the outer surfaces 124 and 125 of the ridges and the vertical direction of the flat plate body 121 are preferably 3 ° to 60 °, respectively, as in the case of the hollow body 10. More preferably, it is ˜15 °.

The second member 130 includes a long bottom plate portion 133 and long side plate portions 131 and 132 that form the wall of the hollow body 110 on the bottom plate portion 133. Further, when the inner side surface 134 and the inner side surface 135 are joined to the first member 120, the inner side surface 134 and the inner side surface 135 are provided so as to be inclined inward as the distance from the flat plate body 121 of the first member increases. The inclination angle of the inner side surface 134 and 135, i.e., an inner surface 134 and 135, the angle alpha ₆ formed by the vertical direction of the inner bottom surface 136, beta ₆ is, alpha _5, which is approximately equivalent to the beta _5. Therefore, the inner side surface 134 can be brought into close contact with the outer surface 124 of the convex line of the first member 120, and the inner side surface 135 can be brought into close contact with the outer side surface 125 of the convex line of the first member 120. On the other hand, the outer side surfaces 137 and 138 of the side plate portions 131 and 132 of the second member are not inclined.

  The hollow body 110 as described above has the same characteristics as the hollow body 10 except that the outer surfaces 137 and 138 of the side plate portions 131 and 132 are not inclined. Therefore, when joining both members, the adhesive is not scraped off, and the members can be joined with high strength.

Moreover, the hollow body of the present invention may not have two ridges of the first member. For example, the hollow body may be formed by providing only one ridge on the flat plate of the first member. .
Moreover, the position of the protrusion provided on the flat plate is not limited to the edge portion of the flat plate as in the illustrated example. For example, a member having a flat plate body wider than the first member shown in FIG. 1 is used, and a ridge is provided near the center in the width direction of the flat plate body along the longitudinal direction of the flat plate body. A hollow body may be formed only at the central portion of the flat plate by joining the second member to the plate.

  Examples of the present invention will be specifically shown and described in detail below. In addition, this invention is not limited by the matter described below.

Example 1
First, a prepreg (a) was prepared by impregnating a carbon fiber woven fabric obtained by weaving a carbon fiber bundle having 3000 filaments in a plain weave with an epoxy resin. Moreover, the unidirectional prepreg (b) and CF (carbon fiber) -SMC were prepared by impregnating the carbon fiber aligned in one direction with an epoxy resin.

Next, a mold for molding the first member 20 was prepared, and one layer of prepreg (a) and five layers of unidirectional prepreg (b) were laminated thereon. After laminating the prepreg, CF-SMC (c) was placed at a position where the ridges 22 and 23 were formed, and after clamping, compression molding was performed to obtain a first member 20 made of fiber reinforced resin. The first member 20 includes a flat plate body 21 and ridges 22 and 23 having a triangular cross section provided on the flat plate body 21 along the longitudinal direction of the flat plate body. The outer surfaces 24 and 25 of the ridges are inclined. An outer surface 24, 25 of the convex, the angle alpha ₁ formed by the vertical flat body 21, beta ₁ is, alpha ₁ is 10 °, respectively, beta ₁ is 40 °.

In addition, two types of prepregs similar to the case of the first member 20 were prepared.
Next, a mold for molding the second member 30 is prepared, and after laminating one layer of the prepreg (a) and five layers of the unidirectional prepreg (b), bagging, heating and heating in the autoclave are performed. The second member 30 made of fiber reinforced resin was obtained by pressing (at 80 ° C. for 60 minutes, followed by 130 ° C. for 90 minutes (0.4 MPa)). The side plate portions 31 and 32 are provided so as to incline inward as the distance from the flat plate body 21 of the first member is joined to the first member 20, and the inner side surface 34 and the inner side surface 35 are inclined. The inclination angle of the inner side surfaces 34, 35, that is, the angle formed by the inner side surfaces 34, 35 and the vertical direction of the inner bottom surface 36 is 10 ° for α _{2 and} 40 ° for β ₂ . Therefore, the inner side surface 34 can be in close contact with the outer side surface 24 of the ridge of the first member 20, and the inner side surface 35 can be in close contact with the outer side surface 25 of the ridge of the first member 20.

Next, Araldite AW106 (main agent) manufactured by Huntsman Advanced Materials is used as the adhesive 41 on the outer surfaces 24 and 25 of the ridges of the first member 20 and the surfaces 26 and 27 of the end portions in the width direction of the flat plate body. And a hardener HV953U (curing agent) manufactured by the same company were applied at a ratio of 100: 60 and joined to the second member 30 to obtain a fiber-reinforced resin hollow body 10.
In the fiber-reinforced resin hollow body 10, both members were joined with very high joining strength.

It is a perspective view which shows one embodiment of the fiber-reinforced resin hollow body of this invention. It is sectional drawing cut | disconnected by line AA of FIG. It is a perspective view which shows an example of other embodiment of the hollow body made from fiber reinforced resin of this invention. It is sectional drawing cut | disconnected by line BB of FIG. It is a perspective view which shows an example of other embodiment of the hollow body made from fiber reinforced resin of this invention. It is sectional drawing cut | disconnected by line CC of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Hollow body made from fiber reinforced resin 20 1st member 21 Flat plate main body 22, 23 Convex strips 24, 25 Outer surface of convex strip 30 Second member 31, 32 Side plate part 34, 35 which forms wall body Side surface 41 Adhesive 50 Hollow body made of fiber reinforced resin 60 First member 61 Flat plate body 62, 63 Convex strip 64, 65 Outer surface of convex strip 70 Second member 71, 72 Side plate portion 73, 74 forming wall body Wall inner surface 110 Fiber reinforced resin hollow body 120 First member 121 Flat plate body 122, 123 Projection strip 124, 125 Projection strip outer surface 130 Second member 131, 132 Side plate portion 134 forming a wall body, 135 Inside surface of wall

Claims (1)

When a hollow body is formed by joining the first member made of flat fiber-reinforced resin and the first member, the second member made of fiber-reinforced resin having a wall body rising from the flat plate of the first member The member is a bonded fiber-reinforced resin hollow body,
The first member includes a flat plate main body and one or more ridges on one side of the flat plate main body, and when the outer surface of the ridge is joined to the second member, Inclined so that it is in close contact with the side,
The flat plate body is formed using a prepreg and the ridges using a carbon fiber sheet molding compound.
The second member is inclined inward as the inner surface of the wall moves away from the flat plate body of the first member,
A fiber-reinforced resin hollow body in which the outer side surface of the ridge of the first member and the inner side surface of the second member are joined via an adhesive.

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