JP2007285330A - Method of forming rivet-like fastening member, rivet-like fastening member, and intermediate material for forming rivet-like fastening member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a lightweight rivet-like fastening member by a rather simple method. <P>SOLUTION: This rivet-like fastening member 10 is formed in a tubular hole extended through plate materials 6, 8. The rivet-like fastening member comprises a tubular shaft part 12 and head-like parts 14, 15 on both sides of the plate materials 6, 8. To form the rivet-like fastening member 10, a semi-hardened braiding knitted in a tubular shape to include carbon fibers and a thermosetting resin in a semi-hardened state is so inserted into a fastening hole that its both ends can be projected therefrom. A mold releasing guide shaft is inserted into the tubular hollow portion of the braiding. With the mold releasing guide shaft used as a guide, both ends of the semi-hardened braiding are pressed and spread into a head shape by a proper pressing patch to form the braiding into a rivet-like shape, and the semi-hardened resin is thermally set. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for forming a rivet-like fastening member, a rivet-like fastening member, and an intermediate material for forming a rivet-like fastening member, and in particular, is inserted into a fastening hole provided through a plurality of parts, on both sides of the fastening hole. The present invention relates to a method for forming a rivet-like fastening member that widens and protrudes a protruding portion, and a rivet-like fastening member formed by the method, and an intermediate material for forming a rivet-like fastening member used in the method.

  In order to reduce the weight of aircraft, vehicles, etc., fiber reinforced resin is used. The fiber reinforced resin is, for example, carbon fiber reinforced resin (CFRP) or the like, and is obtained by blending carbon fiber having excellent strength with a resin as a reinforcing material. By applying, it is possible to obtain a product such as a high-strength and lightweight frame body integrated. However, CFRP-integrated products have difficulties in recycling materials, and the materials themselves such as CFRP are also expensive. Therefore, CFRP is used to make multiple simple parts and join them together. Thus, a product having a desired shape is obtained.

  As a method for joining a plurality of components, particularly a method for laminating and joining a plurality of plate members, a rivet technique and a fastening method using bolts and nuts are widely used. If a metal rivet, a metal bolt, or the like is used, the fastening member becomes heavy because it is made of metal, which is not suitable for the purpose of reducing the weight using CFRP. Therefore, the weight reduction of the fastening member has been studied.

  For example, in Patent Document 1, two or more members of a corrosion-resistant material are bonded under pressure with a mechanical joint such as a bolt-nut as a low cost joining method having sufficiently high strength and corrosion resistance. Then, it is disclosed that the mechanical joint is removed, the removed portion is filled with an uncured fiber reinforced thermosetting resin, and the thermosetting resin is cured to form a rivet.

  Further, Patent Document 2 solves the problem that the formation of the head becomes insufficient because the epoxy resin is a thermosetting resin when an epoxy resin matrix is used as a rivet forming material with a fiber curable resin. It is disclosed that a thermoplastic resin is used as a matrix resin as a fiber reinforced resin. Here, the fibers are arranged in a predetermined rivet shape in the mold, and after closing the mold, molten ω-lactams containing a polymerization catalyst and an initiator are injected, and this is heated and molded by the monomer casting method. The resin is nylon (polyamide resin). And after forming a rivet, passing this rivet through the attachment hole of a to-be-fastened material, and forming a head by heating using the shaping | molding type | mold which has the recessed part for head formation is described.

  Further, in Patent Document 3, a large number of fibers are bundled with a metal ring for bundling, and this is inserted into a through-hole for rivets provided in an object to be bonded, and a liquid resin is injected and dried. Curing is disclosed.

JP 52-15958 A JP-A-4-244609 JP-A-6-173914

  As described above, it has been proposed to use a resin to form a rivet and to join parts together. However, the method of Patent Document 1 requires a complicated process, and the method of Patent Document 2 forms a head portion with a thermoplastic resin, so that a problem remains in strength. Moreover, since the method of patent document 3 bundles resin using a metal ring, a process is complicated and a weight increases. As described above, according to the prior art, a lightweight rivet technology using a resin has been attempted, but a complicated process is required, or a problem is left in terms of strength or weight reduction, which is insufficient. .

  It is an object of the present invention to provide a method for forming a lightweight rivet-like fastening member in a relatively simple manner. Another object is to provide a lightweight rivet-like fastening member. It is another object of the present invention to provide an intermediate material used in a method for forming a lightweight rivet-like fastening member by a relatively simple method. The following means contribute to at least one of these purposes.

  The method for forming a rivet-like fastening member according to the present invention is a method for forming a rivet-like fastening member that is inserted into a fastening hole provided through a plurality of parts, and a portion protruding from both sides of the fastening hole is widened in a head shape and fastened. The fiber is knitted in a semi-cured braid containing a thermosetting resin in a semi-cured state, or a semi-cured braid in which a semi-cured resin and a fiber are knitted in a tubular shape so as to protrude from both ends. Braid insertion process for inserting into the fastening hole, guide insertion process for inserting the release guide shaft into the cylindrical hollow part of the semi-cured braid, and crushing both ends of the semi-cured braid using the release guide shaft as a guide And forming into a rivet shape, and a curing step of thermally curing a semi-cured resin contained in the semi-cured braid.

  Further, the rivet-like fastening member according to the present invention is a rivet-like fastening member that is inserted into a fastening hole provided through a plurality of parts, and a portion protruding to both sides of the fastening hole is widened in a head shape and fastened. A composite braid in which a thermosetting resin is contained between fibers knitted in a cylindrical shape, or a composite braid in which fibers and a thermosetting resin are knitted in a cylindrical shape are fixed to the inner wall of the fastening hole, It has a shaft portion having a smooth cylindrical inner diameter, and both side head-shaped portions that are crushed and widened beyond the diameter of the fastening hole, with the portion of the composite braid protruding on both sides of the fastening hole. .

  Moreover, it is preferable that a both-side head-shaped part has a head hole connected with the cylindrical internal diameter of a axial part.

  Moreover, the rivet-shaped fastening member according to the present invention preferably has a cylindrical inner diameter portion of the composite braid of the shaft portion and a reinforcing portion filled in the head hole.

  Further, the head hole is preferably any one of an elliptical shape, a polygonal shape, or a star shape having a plurality of radial ridges.

  In the rivet-shaped fastening member according to the present invention, the fiber of the composite braid is preferably a carbon fiber, a glass fiber, or an aramid fiber.

  In addition, the intermediate material for forming a rivet-like fastening member according to the present invention is inserted into a fastening hole provided through a plurality of parts, and a portion protruding from both sides of the fastening hole is widened into a head shape and fastened. A semi-cured braid that is an intermediate material for forming a member, has a longitudinal dimension longer than the length dimension of the fastening hole, and includes a thermosetting resin in a semi-cured state in which the fibers are knitted into a tubular shape, or Semi-cured braid in which semi-cured resin and fiber are knitted into a cylindrical shape, and has a longer dimension than the longitudinal dimension of the semi-cured braid. And a release guide shaft made of a material having moldability.

  The release guide shaft is preferably a plastic tube.

  With at least one of the above-described configurations, a semi-cured braid in which a thermosetting resin in a semi-cured state is included in a knitted fiber or a semi-cured braid in which a semi-cured resin and a fiber are knitted in a tubular shape is used. Then, the semi-cured braid in the state of the semi-cured resin is inserted into the fastening hole so as to protrude both ends, the release guide shaft is inserted into the cylindrical hollow portion of the semi-cured braid, and the release guide shaft As a guide, both ends of the semi-cured braid are crushed and spread into a head shape and formed into a rivet shape. Thereafter, the semi-cured resin is thermally cured. Thus, a rivet-shaped fastening member is formed by the composite braid in which the fiber and the thermosetting resin are entangled and the head-shaped portion that is crushed and widened at both ends.

  The semi-cured braid in the state of being knitted in a cylindrical shape is fully deformable, and is guided by the outer shape of the mold release guide and the inner diameter of the fastening hole, and protrudes from the fastening hole by pushing both ends. The rivet can be crushed and expanded so that a so-called rivet head can be easily formed. Thereafter, the rivet-like shape is cured by thermosetting, whereby a lightweight fastening member having sufficient strength can be obtained by entanglement of the fibers and the thermosetting resin.

  The rivet-shaped fastening member formed in this way is a composite braid in which a thermosetting resin is contained between fibers knitted into a cylinder, or a fiber and a thermosetting resin knitted into a cylinder. The composite braid is fixed to the inner wall of the fastening hole, the shaft part with a smooth cylindrical inner diameter, and the part of the composite braid protruding on both sides of the fastening hole are crushed and expanded beyond the diameter of the fastening hole Since both sides have a head-like portion, the fibers and the thermosetting resin are entangled with each other to have sufficient strength and light weight.

  Moreover, since both side head-shaped parts have the head hole connected with the cylindrical internal diameter of a shaft part, they are lightweight. Further, if necessary, this communication hole can be conveniently used, for example, through a wire connecting both sides of the fastened members, or by flowing cooling air.

  Further, since the cylindrical inner diameter portion and the head hole of the composite braid of the shaft portion are filled into the reinforcing portion, the strength can be further improved.

  Further, since the head hole has an elliptical shape, a polygonal shape, or a star shape having a plurality of radial ridges, the engagement area between the component to be fastened and the rivet-like fastening member is increased, and fastening is further performed. Can be strong. Further, when using an ellipse, the fastening strength in that direction can be further increased by aligning the major axis of the ellipse with the pulling direction and, if necessary, filling the head hole with a reinforcing material.

  Further, since the fibers of the composite braid are carbon fibers, glass fibers, or aramid fibers, sufficient strength can be ensured.

  In addition, as an intermediate material, it includes a semi-cured braid having a longitudinal dimension longer than the length of the fastening hole and a release guide shaft having a longitudinal dimension longer than that, so prepare this intermediate material, A rivet-like fastening member can be easily formed simply by inserting this into a fastening hole, crushing and expanding both ends to form a head shape, and then thermosetting.

  Further, since the release guide shaft is a plastic tube, the longitudinal dimension can be easily adjusted with a simple cutting tool. For example, by using scissors or the like, both the composite braid and the release guide shaft can be easily cut to an arbitrary length.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, the formation of a rivet-like fastening member used for fastening two CFRP plate members together is described. However, if a common fastening hole is provided, the number of plate members is more than that. May be. The material of the plate material may be other than CFRP. Further, the fastening target may be a part or product having a shape other than the plate as long as it has a common fastening hole. Further, the dimensions and the like described below are examples for explanation, and can be appropriately changed according to the required specifications to be fastened.

  1A and 1B are views showing a state of the rivet-like fastening member 10, wherein FIG. 1A is a plan view and FIG. 1B is a cross-sectional view. Here, two CFRP plate members 6 and 8 are also illustrated as fastening objects. The rivet-like fastening member 10 is formed in a fastening hole that is provided through the plate members 6 and 8 in common, and has a cylindrical shaft portion 12 and head-like portions 14 and 15. The head-like parts 14 and 15 are formed on both sides of the two laminated plate materials. In FIG. 1A, which is a plan view, a head hole 16 is shown as a cylindrical hollow portion passing through the head portions 14 and 15 and the shaft portion 12. As will be described later, the shaft portion 12 and the head-like portions 14 and 15 are composed of a composite braid in which carbon fibers and a thermosetting resin are entangled, and the head-like portions 14 and 15 are The part of the composite braid from which the composite braid protrudes on both sides of the fastening hole is crushed, and the part is expanded beyond the diameter of the fastening hole.

  A method of forming the rivet-shaped fastening member 10 having such a configuration, particularly the content of the composite braid, will be described in detail with reference to the flowchart of FIG. 2 and FIGS. FIG. 2 is a flowchart showing each procedure of a method for forming a rivet-like fastening member, FIG. 3 is an explanatory view of an intermediate material including a braid and a release guide shaft, and FIG. 4 is an intermediate material used as a fastening hole. The figure which shows a mode that it inserts, FIG. 5 is a figure which shows a mode that the both ends of a braid are crushed.

  In order to form the rivet-like fastening member 10, first, a braid having an outer shape suitable for a fastening hole is prepared. The braid is a so-called “henso” and is made by knitting fibers into a cylindrical shape. The braid can be obtained by continuously knitting carbon fibers (Carbon Fiber: CF), glass fibers (Glass Fiber: GF), or aramid fibers (Alamid Fiber: AF) on a shaft using a cylindrical mandrel. It is possible to make a braid with an arbitrary outer diameter by changing the shaft diameter of the mandrel. The braid can be knitted by mixing resin fibers in addition to CF and GF. Here, a semi-cured braid in which semi-cured resin fibers and CF fibers are knitted into a cylindrical shape is used.

  As the resin fiber in a semi-cured state, it is possible to use a resin fiber having a viscosity that does not cause a crosslinking reaction by treating a thermosetting resin such as an epoxy resin or a polyester resin. The semi-cured resin fiber can have a sufficient strength by causing a crosslinking reaction by an appropriate heat treatment thereafter. Instead of the semi-cured braid in which the semi-cured resin fibers and CF fibers are knitted into a cylindrical shape, a braid knitted in a cylindrical shape with only CF fibers is prepared, and this includes a semi-cured thermosetting resin. Alternatively, a semi-cured braid may be used. In this way, a semi-cured braid is prepared (S10).

  FIG. 3A shows a state of a semi-cured braid 20 in which semi-cured resin fibers and CF fibers are knitted into a cylindrical shape. The semi-cured braid 20 is a semi-cured resin fiber and CF fiber that are knitted in a five-ply shape in a cylindrical shape, and has an outer diameter of about 10 mm and an axial length of about 15 mm and five layers in a free state. Is about 0.2 mm thick. The outer diameter in the free state is slightly narrower than the diameter of the fastening hole, and the length in the free state is sufficiently longer than the length of the fastening hole. Of course, a semi-cured braid 20 with other dimensions can be used according to the fastening specifications. The semi-cured braid 20 can be obtained by cutting from a raw material that is continuously knitted into a long tube shape to a desired length with an appropriate cutting tool such as scissors.

  Along with the preparation of the semi-cured braid, a release guide shaft is prepared (S12). FIG. 3A shows two pairs of release guide shafts 22 and 23. The release guide shafts 22 and 23 have a function of guiding the deformation of the semi-cured braid 20 in the axial direction when the subsequent processing is performed. A material composed of a material having a good releasability is used so that it can be easily removed later. The release guide shafts 22 and 23 may be solid bars or tubes having an appropriate thickness. The outer diameters of the release guide shafts 22 and 23 are slightly thinner than the inner diameter of the semi-cured braid 20, and the total axial length of one pair is slightly larger than the axial length of the semi-cured braid 20 in the free state. Longer. In the example of FIG. 3 (a), a plastic tube having an outer diameter of about 9 mm, two pairs of about 18 mm, and a wall thickness of 0.2 mm is separated from the above-mentioned dimension of the semi-cured braid 20. It is shown as mold guide shafts 22 and 23. In this case, the release guide shafts 22 and 23 can be obtained by cutting the raw material of the long plastic tube into a desired length with an appropriate cutting tool such as scissors. As the plastic tube, for example, a Teflon (registered trademark) tube can be used. Further, the reason why two release guide shafts are used as one set is to facilitate the insertion and removal from the semi-cured braid 20, and when the length of the fastening holes is short, You may comprise with components. Conversely, when the length of the fastening hole is too long, it may be composed of three or more parts.

  The release guide shafts 22 and 23 are inserted into the inner diameter hollow portion of the semi-cured braid 20 to form the intermediate material 30 (S14). FIG. 3B shows the state of the intermediate material 30. By preparing the intermediate material 30 in advance, when there are a plurality of fastening holes, the fastening can be efficiently advanced by continuous work. Therefore, even if the semi-cured braid 20 and the release guide shafts 22 and 23 are not combined into the form of the intermediate material 30, they may be prepared independently and sequentially inserted in the next insertion step.

  Next, the intermediate material 30 is inserted into the fastening hole (S16). This is shown in FIG. That is, FIG. 4A shows a state in which two plate members 6 and 8 are laminated together with the fastening holes 4, and FIG. 4B shows that the intermediate material 30 is inserted into the fastening holes 4. The state of being done is shown. Thus, in a state where the intermediate material 30 is inserted into the fastening hole 4, both end portions of the semi-cured braid 20 protrude from both sides of the fastening hole 4, and further from both end portions of the semi-cured braid 20, End portions of the release guide shafts 22 and 23 protrude.

  In this state, molding dies are set on both sides of the fastening hole 4 (S18). The molding die is for crushing and expanding the portion of the semi-cured braid 20 protruding from both sides of the fastening hole 4 to mold the head portion. At that time, the release guide shafts 22 and 23 function as a guide.

  FIG. 5 is a view showing a state where the molding die 40 is set with two plate members 6 and 8 sandwiched therebetween. In the molding die 40, an upper die 42 is disposed on the upper surface side of the two stacked plate members 6 and 8, and a lower die 43 is disposed on the lower surface side. Both are composed of presser plates 44 and 45 and flanges 46 and 47 for applying a load to the presser plates 44 and 45. The holding plates 44 and 45 are plate-like members that have through holes for passing the release guide shafts 22 and 23 and are respectively applied to both ends of the semi-cured braid. By passing the tip portions on both sides of the release guide shafts 22 and 23 through the through holes of the set of holding plates 44 and 45, a pressing force is applied to the set of flanges 46 and 47, respectively. 45 moves in the direction which crushes the both ends of a semi-hardened braid, respectively. The semi-cured braid is guided by the fastening hole on the outer peripheral side, guided by the release guide shafts 22 and 23 on the inner diameter side, and pressed at both ends by a set of holding plates 44 and 45 in the axial direction. The two side end portions 18 and 19 are crushed and expanded so as to be folded. As a result, a shaft portion in which the braid is compressed in the axial direction is formed in the penetration portion of the fastening hole, and the braid is crushed and folded on the opening portions on both sides of the fastening hole, that is, on the surface side of the plate members 6 and 8. A head-like portion that is folded and widened in the radial direction is formed (S20).

  Returning again to FIG. 2, the release guide shafts 22 and 23 are then removed (S22). However, this removal may be performed at any time after S20. For example, the removal may be performed at the end after all the processes are completed. Then, a curing process is performed (S24). The curing process is a heating process that is performed in order to cause a cross-linking reaction in a semi-cured thermosetting resin to be cured. For example, heat treatment is performed at 150 ° C. for about 30 minutes. Thereby, the shape formed by S20 is hardened as it is, and the shape of the shaft portion 12 and the head-like portions 14 and 15 described in FIG. When the semi-cured resin is solidified by a crosslinking reaction, the shaft portion 12 is fixed to the inner wall of the fastening hole, and the head portions 14 and 15 are fixed to the surfaces of the plate members 6 and 8. Thereafter, the mold is removed (S26).

  As described above, the release guide shafts 22 and 23 may be removed thereafter. Further, when the head portion is firmly formed and the shape is less likely to return during the molding of S20, the mold may be removed immediately after S20.

  In this way, the rivet-like fastening member 10 described with reference to FIG. 1 is formed. As described above, the semi-cured braid 20 is compressed in the axial direction, and both ends are crushed and widened to form a head-like portion, so that the carbon fiber and the semi-cured resin are intertwined and compressed. Since the thermosetting treatment is performed and the semi-cured resin is cured, both the shaft portion 12 and the head portions 14 and 15 are compressed composite braids in which the carbon fibers and the cured resin are compressed and intertwined. In other words, a compressed fabric is hardened with resin. Therefore, the rivet-like fastening member 10 is strong against tensile and compression in the axial direction, and is strong against shear perpendicular to the axial direction.

  Since the release guide shafts 22 and 23 guide the inner diameter of the semi-cured braid to be compressed during the molding of S20, the inner wall of the shaft portion 12 is roughened on the surface of the release guide shafts 22 and 23. And the same level of smoothness. Further, after the release guide shafts 22 and 23 are removed, they are through holes, and the head-shaped holes 16 that are the openings can be seen in the head-shaped portions 14 and 15. Therefore, the two plate members 6 and 8 are in communication with each other through the through hole. For example, if necessary, wiring, piping, etc. can be passed through the through hole, and cooling fluid can be passed. It is also possible to supply, discharge and circulate through this through hole.

  The shape of the head hole can be varied depending on the outer shape of the release guide shafts 22 and 23 in addition to the circular shape. FIG. 6 shows an example of the shape of the head hole other than circular. FIG. 6A shows an elliptical head hole. In this shape, the resistance force to the external force can be strengthened by adjusting the direction of the elliptical shape to the direction in which the external force such as pulling, compression, shearing of the plate members 6 and 8 is applied. For example, when the fastening hole is circular, the external force can be applied in the direction in which the thickness of the rivet-like fastening member 10 is large by setting the direction of the external force in the minor axis direction of the ellipse. Further, as described below, when the head hole is filled with an appropriate reinforcing material, the resistance force can be increased by setting the major axis direction of the elliptical shape as the direction of the external force. FIG. 6B is a diagram illustrating an example of a polygonal head hole, and FIG. 6C is a diagram illustrating an example of a star-shaped head hole having a plurality of radial ridges. If the shape of the fastening hole is matched with the shape of the head hole, the engagement between the braid and the fastening hole can be ensured by these corner portions, and the fastening strength can be improved. In addition, as described below, when the head hole is filled with an appropriate reinforcing material, these corner portions can ensure the engagement between the reinforcing material and the braid, thereby improving the fastening strength. be able to.

  FIG. 7 is a diagram illustrating an example in which a portion of the through hole including the head hole is filled with an appropriate reinforcing material 50. As the reinforcing material 50, an epoxy resin or the like can be used. The curing process of the reinforcing material 50 may be performed simultaneously with the curing process of the semi-cured braid. The filling of the reinforcing material 50 in that case is preferably performed after removing the release guide shafts 22 and 23 after S20 in FIG. By filling the reinforcing material 50, the fastening strength of the rivet-like fastening member can be further improved.

  FIG. 8 is a diagram illustrating an example in which the head portion including the head hole is covered with another covering material 52. In the example of FIG. 8, the covering material 52 is provided only on the head portion 14 on the plate material 6 side, but this may be provided on the head portion 15 on the plate material 8 side. It may be provided on both sides. The covering material 52 can be used for the purpose of closing the opening of the head hole, and can be further improved in the fastening strength of the rivet-like fastening member by bonding to the plate material 6 or the plate material 8. As the covering material 52, an epoxy resin plate can be used. As the covering material 52, for example, an end material generated when the plate materials 6 and 8 are formed can be used. For example, the head hole may be covered with a semi-cured epoxy resin plate and firmly pressed against the plate material 6 or the plate material 8 and cured at the same time as the semi-cured braid 20 is cured. Further, the fastening strength can be further improved by combining the covering material 52 with the filling of the reinforcing material 50 described in FIG.

It is the top view and sectional drawing of a rivet-like fastening member of an embodiment concerning the present invention. In embodiment which concerns on this invention, it is a flowchart which shows each procedure of the formation method of a rivet-like fastening member. In embodiment which concerns on this invention, it is a figure explaining the intermediate material containing a braiding and the guide shaft for mold release. In embodiment which concerns on this invention, it is a figure which shows a mode that an intermediate material is inserted in the hole for fastening. In embodiment which concerns on this invention, it is a figure which shows a mode that both ends of a braid are crushed. In embodiment which concerns on this invention, it is a figure which shows the example of the shape of head holes other than circular. In embodiment which concerns on this invention, it is a figure which shows the example which fills the part of a through hole including a head hole with a suitable reinforcing material. In embodiment which concerns on this invention, it is a figure which shows the example which covers the part of a head-shaped part including a head hole with another coating | covering material.

Explanation of symbols

  4 fastening holes, 6, 8 plate material, 10 rivet-like fastening members, 12 shaft parts, 14, 15 head parts, 16 head holes, 18, 19 both ends, 20 semi-cured braids, 22, 23 for release Guide shaft, 30 intermediate material, 40 mold for molding, 42 upper mold, 43 lower mold, 44, 45 holding plate, 46, 47 flange, 50 reinforcing material, 52 coating material.

Claims (8)

A method for forming a rivet-like fastening member that is inserted into a fastening hole provided through a plurality of parts, and a portion protruding from both sides of the fastening hole is widened into a head shape and fastened.
A semi-cured braid in which a semi-cured thermosetting resin is contained in a tubular knitted fiber, or a semi-cured braid in which a semi-cured resin and a fiber are knitted into a cylindrical shape, is inserted into the fastening hole so as to protrude from both ends A braid insertion step to insert;
A guide insertion step of inserting a release guide shaft into the cylindrical hollow portion of the semi-cured braid;
Using the guide shaft for mold release as a guide, both ends of the semi-cured braid are crushed and expanded into a head shape, and a molding process for molding into a rivet shape,
A curing step of thermally curing the semi-cured resin contained in the semi-cured braid;
A method of forming a rivet-like fastening member comprising: A rivet-like fastening member that is inserted into a fastening hole provided through a plurality of parts, and a portion protruding from both sides of the fastening hole is widened in a head shape and fastened,
A composite braid in which a thermosetting resin is contained between fibers knitted in a cylindrical shape, or a composite braid in which fibers and a thermosetting resin are knitted in a cylindrical shape are fixed to the inner wall of the fastening hole, A shaft portion having a smooth cylindrical inner diameter;
Both sides of the braid that protrudes on both sides of the fastening hole are crushed and widened beyond the diameter of the fastening hole;
A rivet-like fastening member comprising: In the rivet-like fastening member according to claim 2,
The rivet-like fastening member, wherein the head portions on both sides have head holes communicating with the cylindrical inner diameter of the shaft portion. In the rivet-like fastening member according to claim 3,
A rivet-like fastening member having a cylindrical inner diameter portion of a composite braid of a shaft portion and a reinforcing portion filled in a head hole. In the rivet-like fastening member according to claim 3,
The rivet-like fastening member is characterized in that the head hole is any one of an elliptical shape, a polygonal shape, or a star shape having a plurality of radial ridges. In the rivet-like fastening member according to claim 2,
A rivet-like fastening member, wherein the fibers of the composite braid are carbon fibers, glass fibers, or aramid fibers. An intermediate material for forming a rivet-like fastening member that is inserted into a fastening hole provided through a plurality of parts and expands into a head-like portion projecting on both sides of the fastening hole,
Semi-cured braid with semi-cured thermosetting resin or semi-cured resin and fiber knitted into a cylinder with a longer dimension than the length of the fastening hole. Semi-cured braid,
A mold release guide shaft having a longer dimension than that of the semi-cured braid, inserted into the cylindrical inner diameter portion of the semi-cured braid, and made of a material having a releasability to the semi-cured resin
An intermediate material for forming a rivet-like fastening member. In the intermediate material for forming a rivet-like fastening member according to claim 7,
An intermediate material for forming a rivet-shaped fastening member, wherein the release guide shaft is a plastic tube.

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