JP2010025177A - Fiber-reinforced plastic structure and fastening structure and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fiber-reinforced plastic structure equipped with a collar for fastening. <P>SOLUTION: The fiber-reinforced plastic structure 10 is provided with a core member 12, an envelope member 14 covering the core member 12, and the collar 16. The collar 16 penetrates a through-hole 22 formed in the core member 12, and is equipped with a through-hole 26. Both end surfaces 16c and 16d of the collar 16 are exposed from the envelope member 14. A gap 28 is formed between a side surface of the collar 16 and the envelope member 14. The envelope member 14 is formed as described above, and deformation or failure of the envelope member 14 can be prevented even when the collar 16 disposed on the core member 12 is thermally expanded. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fiber reinforced plastic structure in which a core member is covered with an outer skin member made of fiber reinforced plastic. In particular, the present invention relates to a fiber reinforced plastic structure having a collar for inserting a fastener such as a bolt.

  Patent Document 1 discloses a technique for attaching a collar for inserting a fastener such as a bolt to a fiber reinforced plastic structure in which a core member is covered with a skin member made of fiber reinforced plastic. In this technique, a through hole is formed in a fiber reinforced plastic structure, and a collar is inserted into the through hole. When the fiber reinforced plastic structure has a collar for inserting fasteners such as bolts, the fiber reinforced plastic structure and other members are firmly fastened when the fiber reinforced plastic structure and other members are fastened. can do.

JP-A-9-310712

In the technique of Patent Document 1, a through hole for inserting a collar is formed in the core member and the outer skin member while the core member is covered with the outer skin member, and the collar is inserted into the through hole. If the through hole is formed or the collar is inserted while the core member is covered with the outer skin member, the outer skin member may be deformed or damaged.
In order to solve the above problem, it is conceivable to form a through hole in the core member and insert a collar before the core member is covered with the outer skin member. Thereby, deformation or breakage of the outer skin member due to formation of the through hole or insertion of the collar can be prevented.

When the collar is inserted into the core member before being covered with the outer skin member, it is necessary to cover the core member in a state where the collar is inserted with the outer skin member and to heat and cure the outer skin member in a state where the collar is inserted.
The collar is often formed of, for example, a metal material. For example, when the collar is formed of a material having a high coefficient of thermal expansion such as a metal material, the collar may expand greatly during heat curing, and the outer skin member may be greatly deformed or damaged locally. .
There is a need for a structure that prevents deformation and breakage of the outer skin member even when the outer skin member is heat-cured with the collar inserted.
The present invention solves the above problems. The present invention realizes a fiber-reinforced plastic structure in which deformation or breakage of the outer skin member is prevented even when the collar provided on the core member is thermally expanded.

  The present invention relates to a fiber reinforced plastic structure having a collar for inserting a fastener such as a bolt. The fiber reinforced plastic structure is made of a core member, a material that penetrates the core member and has a higher thermal expansion coefficient than the core member, and has a collar having a through hole and a fiber reinforced plastic that covers the core member. The outer skin member is provided. In the fiber reinforced plastic structure of the present invention, both end surfaces of the collar are exposed from the outer skin member, and a gap is formed between the side surface of the collar and the outer skin member.

In this fiber reinforced plastic structure, both end faces of the collar passing through the core member are exposed from the outer skin member and are not covered with the outer skin member. Further, a gap is formed between the side surface of the collar penetrating the core member and the outer skin member, and the outer skin member is not in contact with the side surface of the collar. Therefore, when the outer cover member is heated and cured with the collar inserted, the collar is prevented from interfering with the outer cover member even when the collar is thermally expanded in the axial direction or the radial direction. Thereby, even when the collar provided on the core member is thermally expanded, deformation or breakage of the outer skin member is prevented.
According to the structure of this fiber reinforced plastic structure, even when the outer skin member is heat-cured in a state where the collar is inserted, the deformation or breakage of the outer skin member is prevented.

In the above-described fiber reinforced plastic structure, it is preferable that at least one end face of the collar protrudes from the surface of the outer skin member.
According to said structure, when fastening a fiber reinforced plastic structure to another member using fasteners, such as a volt | bolt, a fastener can be made to contact a color | collar reliably and a fastener contacts a outer skin member strongly. This can be prevented. This prevents the fiber reinforced plastic structure from being deformed by the fastening force of the fastener when the fiber reinforced plastic structure is fastened to another member.

  When fastening the above-mentioned fiber reinforced plastic structure to another member, it is preferable to employ the fastening structure described below. The fastening structure includes the above-described fiber-reinforced plastic structure, a fastener that is inserted through the collar of the fiber-reinforced plastic structure, and fastens the fiber-reinforced plastic structure to another member, and a protruding end surface of the collar. A washer is provided between the tools. The washer used here has a step between the radially inner portion and the outer portion, and is in contact with both the protruding end surface of the collar and the surface of the outer skin member.

  In this fastening structure, the washer disposed between the fastener and the fiber reinforced plastic structure is provided with a step in the radial direction, and this step causes the inner portion of the washer existing inside the step to project the collar. The outer portion of the washer that exists outside the step is in contact with the surface of the outer skin member. Therefore, even when the collar protrudes from the surface of the outer skin member, the outer skin member is supported by the washer, and the fiber-reinforced plastic structure can be securely fixed. Moreover, the level | step difference of a washer can be adjusted according to the protrusion condition of a color | collar, and it is suppressed that a fastener contacts a outer skin member strongly. As a result, the outer skin member is prevented from being deformed, and the fiber-reinforced plastic structure can be firmly fastened to the other member.

The present invention also provides a manufacturing method suitable for the above-described fiber-reinforced plastic structure. This manufacturing method includes at least the following three steps.
(1) A collar insertion step of inserting a collar formed of a material having a higher thermal expansion coefficient than the core member into the through hole provided in the core member and having the through hole (2) A core member into which the collar is inserted (3) Heating step of heating and curing the outer shell member before the effect of covering the core member. In this manufacturing method, in the outer member forming step, both ends of the collar are formed. The surface is exposed from the skin member before curing, and a gap is provided between the side surface of the collar and the skin member.
According to this manufacturing method, the above-described fiber reinforced plastic structure can be manufactured.

  According to the present invention, even when the collar provided on the core member is thermally expanded, deformation or breakage of the outer skin member is prevented. Thickness deviation and generation of scratches in the fiber reinforced plastic structure are suppressed, and the accuracy of the fiber reinforced plastic structure can be improved.

The main features of the embodiments described below are first organized.
(Feature 1) The core member is made of a resin material, and more specifically, is made of a foamed resin.
(Feature 2) The collar has a cylindrical shape and is formed of a metal material.
(Feature 3) A nut to which a bolt inserted into a collar of the fiber reinforced plastic structure is screwed is fixed to the other member to which the fiber reinforced plastic structure is fastened.

  Embodiments embodying the present invention will be described with reference to the drawings. FIG. 1 shows a cross-sectional view of a fiber-reinforced plastic structure 10 of this embodiment. The fiber reinforced plastic structure 10 includes a core member 12, a skin member 14, and a collar 16. The outer skin member 14 covers the surface of the core member 12. The collar 16 is inserted through the through holes 22 and 24 of the core member 12 and the outer skin member 14.

The plate-like core member 12 is formed of a lightweight material such as foamed resin. The core member 12 is formed with a through hole 22 into which the collar 16 is inserted.
The outer skin member 14 is formed of fiber reinforced plastic. That is, the outer skin member 14 is formed of a composite material of reinforcing fibers and a matrix resin. In this embodiment, carbon fiber is used as the reinforcing fiber, and thermosetting plastic is used as the matrix resin. The outer skin member 14 is formed by laminating fiber reinforced plastic prepregs. The outer skin member 14 is formed with a through hole 24 into which the collar 16 is inserted.
A collar 16 is inserted into the through hole 22 of the core member 12 and the through hole 24 of the outer skin member 14. The collar 16 is made of a metal material and has a higher coefficient of thermal expansion than the core member 12. The collar 16 is formed with a through hole 26 that penetrates the collar 16 in the axial direction. The inner surface 22 a of the through hole 22 of the core member 12 is in contact with the side surface 16 b of the collar 16. The through hole 24 of the outer skin member 14 has a larger opening area than the through hole 22 of the core member 12. Therefore, a gap 28 is formed between the inner surface 24 a of the through hole 24 and the side surface 16 b of the collar 16. Both end faces 16 c and 16 d of the collar 16 are exposed from the outer skin member 14. The front end surface 16 c of the collar 16 protrudes from the front surface 14 c of the outer skin member 14. On the other hand, the back side end surface 16 d of the collar 16 is located in the same plane as the back side surface 14 d of the outer skin member 14.

FIG. 2 shows an example of a fastening structure for fastening the fiber reinforced plastic structure 10 to the other member 42. As shown in FIG. 2, in this fastening structure, the fiber reinforced plastic structure 10 and the other member 42 are fastened by using a washer 52 and a bolt 54 and a nut 56 which are fasteners.
The fiber reinforced plastic structure 10 is placed on the front surface 42 c of the other member 42. The fiber reinforced plastic structure 10 is placed so that the through hole 26 formed in the collar 16 overlaps the hole 44 formed in the other member 42. A washer 52 is placed on the front end surface 16 c of the collar 16. A bolt 54 is inserted into the washer 52 and the collar 16. As a result, the bolt 54 passes through the washer 52, the collar 16, and the other member 42, and is screwed to the nut 56 on the back surface 42 d of the other member 42. In this embodiment, the nut 56 is welded to the other member 42, and the nut 56 and the other member 42 are integrated. Note that it is not always necessary to weld the nut 56 and the other member 42 together.

In this fastening structure, as shown in FIG. 2, a step 62 is formed in the radial direction of the washer 52. An inner portion 52 b that exists radially inward of the step 62 is in contact with the front end surface 16 c of the collar 16. An outer portion 52 a that is present radially outward from the step 62 is in contact with the front surface 14 c of the outer skin member 14. Therefore, even when the front end surface 16c of the collar 16 protrudes from the front surface 14c of the outer skin member 14, the outer skin member 14 is supported by the washer 52, and the fiber reinforced plastic structure 10 can be reliably fixed.
Further, the step 62 formed on the washer 52 may be appropriately adjusted according to the height difference between the front side end surface 16 c of the collar 16 and the front side surface 14 c of the outer skin member 14. That is, it is preferable to use the washer 52 having a step according to the height difference between the front side end face 16 c of the collar 16 and the front side surface 14 c of the outer skin member 14. This prevents the washer 52 from coming into strong contact with the outer skin member 14 even when the washer 52 comes into contact with the outer skin member 14. As a result, the fiber reinforced plastic structure 10 is prevented from being deformed, and the fiber reinforced plastic structure 10 can be firmly fastened to the other member 42.

Next, a method for manufacturing the fiber reinforced plastic structure 10 will be described.
First, as shown in FIG. 3, a through hole 22 is formed in the core member 12. The through hole 22 may be formed at the same time when the core member 12 is formed. In this case, the step of forming the through hole 22 is omitted. Next, as shown in FIG. 4, the collar 16 is inserted into the through hole 22. At this time, both end faces 16 c and 16 d of the inserted collar 16 are projected from the surface of the core member 12. Next, the outer skin member 14 is formed on the surface of the core member 12. In forming the outer skin member 14, a fiber reinforced plastic prepreg is laminated on the surface of the core member 12. Both end surfaces 16 c and 16 d of the collar 16 protrude from the surface of the core member 12. When laminating the outer skin member 14 on the surface of the core member 12, it is laminated while avoiding both end faces 16 c and 16 d of the protruding collar 16. That is, as shown in FIG. 1, a through hole 24 having a larger diameter than the through hole 22 of the core member 12 is formed in the outer skin member 14. As a result, both end surfaces 16 c and 16 d of the collar 16 are exposed from the outer skin member 14, and a gap 28 is formed between the side surface 16 b of the collar 16 and the outer skin member 14.

In this embodiment, the through hole 22 is formed in the core member 12 before being covered with the outer skin member 14, and the collar 16 is inserted. Therefore, when the through hole 22 is formed in the core member 12 and when the collar 16 is inserted into the through hole 22, the outer skin member 14 is prevented from being deformed or damaged.
Further, when the core member 12 is covered with the outer skin member 14, both end faces 16 c and 16 d of the collar 16 protrude from the core member 12. Therefore, both end surfaces 16c and 16d of the collar 16 can be reliably exposed from the outer skin member 14, and a gap 28 between the side surface 16b of the collar 16 and the outer skin member 14 can be reliably provided.

Next, as shown in FIG. 5, the core member 12 is placed on the heating mold 32 and covered with a heating lid 34. A recess 33 is formed at a position facing the collar 16 of the heating mold 32 so that the back end face 16d of the collar 16 and the heating mold 32 do not interfere even if the collar 16 is thermally expanded. A depression 35 is formed at a position facing the collar 16 of the heating lid 34, so that the front end surface 16 c of the protruding collar 16 and the heating lid 34 do not interfere with each other, and the collar 16 can be expanded even if the collar 16 is thermally expanded. The front end surface 16c of 16 and the heating lid 34 do not interfere with each other.
By heating the heating mold 32 and the heating lid 34, the outer skin member 14 covering the core member 12 is heated and cured, and the strong fiber reinforced plastic structure 10 is realized.

The collar 16 has a higher coefficient of thermal expansion than the outer skin member 14. Therefore, in the heating step shown in FIG. 5, the collar 16 is heated when the outer skin member 14 is heat-cured, and the collar 16 expands greatly.
In this embodiment, when the outer skin member 14 is heated and cured, both end faces 16c and 16d of the collar 16 are exposed from the outer skin member 14, and a gap 28 is provided between the side surface 16b of the collar 16 and the outer skin member 14. ing. Therefore, even when the collar 16 is thermally expanded in the axial direction or the radial direction, the collar 16 does not interfere with the outer skin member 14. As a result, even when the collar 16 provided on the core member 12 is thermally expanded, deformation or breakage of the outer skin member 14 is prevented.
The effect of preventing deformation or breakage of the outer skin member 14 is not limited to when the outer skin member 14 is heated and cured. This is also effective when the manufactured fiber-reinforced plastic structure 10 is heated.

Specific examples of the present invention have been described in detail above, but these are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and changes of the specific examples illustrated above.
For example, the skin member 14 made of fiber reinforced plastic widely includes materials obtained by impregnating a matrix resin into a reinforced fiber and solidifying it. Examples of the reinforcing fibers include inorganic fibers such as carbon fibers and glass fibers, Kevlar fibers, polyethylene fibers, and polyamide fibers. Examples of the matrix resin include thermosetting resins such as epoxy resins, unsaturated polyester resins, vinyl ester resins, and phenol resins.

  The technical elements described in this specification or the drawings exhibit technical usefulness alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. In addition, the technology exemplified in this specification or the drawings can achieve a plurality of objects at the same time, and has technical usefulness by achieving one of the objects.

A cross-sectional view of the fiber reinforced plastic structure 10 is shown. The fastening structure which fastens the fiber reinforced plastic structure 10 to the other member 42 is shown. It is a figure explaining the manufacturing method of the fiber reinforced plastic structure. It is a figure explaining the manufacturing method of the fiber reinforced plastic structure. It is a figure explaining the manufacturing method of the fiber reinforced plastic structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Fiber reinforced plastic structure 12 Core member 14 Outer member 16 Collar 22 Through hole 24 formed in core member 12 Through hole 26 formed in outer member 14 Through hole 28 formed in collar 16 Gap 32 Heating die 34 Heating Lid 52 Washer 54 Bolt 56 Nut 62 Step

Claims (4)

A core member;
The core member is penetrated, formed of a material having a higher coefficient of thermal expansion than the core member, and a collar having a through hole,
It comprises an outer skin member made of fiber reinforced plastic covering the core member,
Both ends of the collar are exposed from the outer skin member, and a gap is formed between the side surface of the collar and the outer skin member.   The fiber-reinforced plastic structure according to claim 1, wherein at least one end face of the collar protrudes from a surface of the outer skin member. A fiber reinforced plastic structure according to claim 2;
A fastener that is inserted through the collar of the fiber reinforced plastic structure and fastens the fiber reinforced plastic structure to another member;
The collar is disposed between the projecting end surface of the collar and the fastener, and a step is provided between the radially inner portion and the outer portion, both of the projecting end surface of the collar and the surface of the outer skin member. A structure for fastening a fiber-reinforced plastic structure, characterized by comprising a washer that comes into contact with the fiber. A method for producing a fiber reinforced plastic structure,
A collar insertion step of inserting a collar formed of a material having a higher coefficient of thermal expansion than the core member and having a through hole into the through hole formed in the core member;
A skin member forming step of covering the core member into which the collar is inserted with a fiber reinforced plastic skin member before curing;
Including a heating step of heating and curing the outer skin member that covers the core member;
In the outer skin member forming step, the both ends of the collar are exposed from the outer skin member, and a gap is provided between the side surface of the collar and the outer skin member. Production method.

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