JPWO2017043654A1 - Method for manufacturing elastic member wire, elastic member wire and elastic member - Google Patents

Abstract

The method for producing a wire for an elastic member according to the present invention includes winding a first reinforcing fiber impregnated with a liquid thermosetting resin around the core so that the core made of a thermoplastic resin is exposed to the outside. 1st step which produces 1 intermediate | middle wire, It winds around a 1st intermediate | middle wire so that a 1st reinforcement fiber may be exposed outside, and a 2nd intermediate | middle with a high melting point resin fiber and a low melting point thermoplastic resin A second step of producing a wire, a third step of winding a second reinforcing fiber impregnated with a liquid thermosetting resin around the second intermediate wire to produce a third intermediate wire, A heating step of heating the intermediate wire to a temperature equal to or higher than a higher one of a curing temperature or a melting point of the low melting point thermoplastic resin and less than a melting point of the high melting point resin fiber.

Description

  The present invention relates to a method for manufacturing an elastic member wire, an elastic member wire, and an elastic member.

  Conventionally, weight reduction of various parts has been pursued as a measure for improving the fuel efficiency of automobiles. For example, aluminum alloy is used instead of cast iron as the material for the engine block, magnesium alloy is used instead of steel as the material for the engine cover and oil pan, and CFRP (Carbon Fiber Reinforced) as the material for the frame and body. The adoption of Plastics) is starting.

  In recent years, from the viewpoint of reducing the weight of automobiles, it has been studied to reduce the weight of coil springs such as suspension springs for suspension. As a wire material for elastic members that can reduce the weight of elastic members such as coil springs, hollow wires, titanium wires with a low specific gravity, and reinforced fibers such as carbon fibers that have a lighter weight effect than the aforementioned wires are used. CFRP elastic member wire formed by the above method (for example, see Patent Documents 1 and 2).

  Patent Document 1 discloses a core made of continuous fibers (reinforcing fibers) impregnated with an uncured thermosetting resin, and a thermoplastic resin having a thermal deformation temperature higher than the curing temperature of the thermosetting resin of the core. An outer layer made of resin and a thermoplastic resin having a softening temperature or melting point lower than the curing temperature of the thermosetting resin of the core, and interposed between and in contact with the core and the outer layer of the core A wire rod having an intermediate layer is disclosed. In Patent Document 1, when heated at a temperature equal to or lower than the deformation temperature of the thermoplastic resin of the outer coating layer, the core body is cured and the fluidized intermediate layer is brought into contact with and bonded to the core body and the outer coating layer. It is described that by forming a layer, the core body and the outer coating layer are joined and integrated by an anchor effect.

  Patent Document 2 discloses a core material made of a thermoplastic resin, a coating layer covering a core material made of a fiber-reinforced composite material including a thermoplastic resin and fibers, and a hollow outermost coating layer made of a thermoplastic resin. And a structural member in which a thermoplastic resin material is interposed between the core material and the hollow outermost coating layer is described. Patent Document 2 describes that the core material, the coating layer, and the outermost coating layer have the lowest melting point of the coating layer.

Japanese Patent Publication No. 1-3668 JP-A-6-182882

  However, in Patent Document 1, the adhesive force at the interface between the core body and the intermediate layer is bonded only by the intermediate layer existing at the interface, and after the thermoplastic resin has once cooled down and solidified, It is estimated that the strength of the material remains. In the structure in which the periphery of the core body impregnated with the thermosetting resin is covered with the thermoplastic resin, the core body cured upon cooling after heating has a small shrinkage rate as a fiber reinforced plastic containing reinforcing fibers, whereas the surrounding area is small. Since the shrinkage rate of the thermoplastic resin is large, it can be said that the core material and the intermediate layer are in close contact with each other. With such adhesive strength due to adhesion, the reinforcing fibers in the core and the intermediate layer could not be firmly fixed, and the strength as a wire was low.

  Moreover, although patent document 2 can heat the coating layer with the lowest melting point at a temperature at which it can be melted and the hollow coating layer can be deformed without melting, the material constituting each component is Since all of them are thermoplastic resins and are only fixed using the difference in melting point, the adhesive strength remains at the interface or the strength of the material after being melted once and cooled. For this reason, the core material and the reinforcing fiber in the coating layer could not be firmly fixed, and the strength as a wire was low.

  This invention is made | formed in view of the above, Comprising: It aims at providing the manufacturing method of the wire for elastic members, the wire for elastic members, and an elastic member which can improve intensity | strength, reducing in weight.

  In order to solve the above-described problems and achieve the object, the manufacturing method of the elastic member wire according to the present invention includes a first reinforcing fiber impregnated with a liquid thermosetting resin as a core material made of a thermoplastic resin. Is wound around the core material so as to be exposed to the outside, a first step of producing a first intermediate wire, a high melting point resin fiber having a melting point higher than the curing temperature of the thermosetting resin, and the high melting point A second intermediate wire is produced by wrapping a low melting thermoplastic resin having a melting point lower than the melting point of the resin fiber around the first intermediate wire so that the first reinforcing fiber is exposed to the outside. A third step of winding a second reinforcing fiber impregnated with a liquid thermosetting resin around the second intermediate wire to produce a third intermediate wire, and the third intermediate wire, The curing temperature or the low melting point thermoplastic resin Characterized in that it comprises a heating step of heating to a temperature below the melting point of the high melting point resin fiber comprising at higher temperatures or more of the temperature of the melting point, the.

  In the method for manufacturing a wire for an elastic member according to the present invention, in the above invention, the second step is a core-sheath type composite fiber in which the low melting point thermoplastic resin covers an outer periphery of the high melting point resin fiber. Is wound around the first intermediate wire to produce a second intermediate wire.

  In the method for manufacturing a wire for an elastic member according to the present invention, in the above invention, the second step is the step of adding the low-melting point thermoplastic resin and the high-melting point resin fiber in the form of fibers independent of each other. The second intermediate wire is produced by winding the intermediate wire.

  In the method for producing a wire for an elastic member according to the present invention, the melting point of the low-melting thermoplastic resin is lower than the curing temperature, and the heating step is equal to or higher than the curing temperature. And heating to a temperature lower than the melting point of the high melting point resin fiber.

  The elastic member wire according to the present invention includes a core material made of a thermoplastic resin and a fiber layer that includes a plurality of reinforcing fibers wound around the core material and covers the core material. The layer is wound around the core material so as to intersect the plurality of reinforcing fibers, the thermosetting resin for fixing the reinforcing fibers, and the reinforcing fibers located on the core material side among the plurality of reinforcing fibers. Comprising a high melting point resin fiber that fixes the reinforcing fiber located on the core material side to the core material, and a low melting point thermoplastic resin that fixes the fiber layer and the core material. To do.

  In the elastic member wire according to the present invention as set forth in the invention described above, the reinforcing fiber is at least one fiber selected from carbon fiber, glass fiber, aramid fiber, and basalt fiber.

  Moreover, the wire for elastic members according to the present invention is characterized in that, in the above invention, the core material is made of polypropylene.

  Moreover, the wire for elastic members according to the present invention is characterized in that, in the above invention, the thermosetting resin is an epoxy resin.

  Moreover, the wire for an elastic member according to the present invention is characterized in that, in the above invention, the core material, the low-melting point thermoplastic resin, and the high-melting point resin fiber are formed using the same resin system. To do.

  Moreover, the elastic member which concerns on this invention is formed using the wire for elastic members which concerns on said invention, It is characterized by the above-mentioned.

  Moreover, the elastic member according to the present invention is characterized in that, in the above invention, the elastic member wire is wound spirally.

  According to the present invention, it is possible to improve the strength while reducing the weight.

FIG. 1 is a schematic diagram showing a configuration of a wire for an elastic member according to an embodiment of the present invention. FIG. 2 is a diagram for explaining a method of manufacturing a wire for an elastic member according to an embodiment of the present invention. FIG. 3 is a diagram for explaining a method of manufacturing a wire for an elastic member according to an embodiment of the present invention. FIG. 4 is a diagram illustrating a method for manufacturing the elastic member wire according to one embodiment of the present invention. Drawing 5 is a figure explaining the manufacturing method of the wire for elastic members concerning one embodiment of the present invention. FIG. 6 is a diagram illustrating a method for manufacturing the elastic member wire according to the embodiment of the present invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described with reference to the accompanying drawings. The drawings are schematic, and the relationship between the thickness and width of each part, the ratio of the thickness of each part, and the like may be different from the actual ones, and the mutual dimensions between the drawings. There may be cases where the relationship and ratio of are different.

  FIG. 1 is a schematic diagram showing a configuration of a wire for an elastic member according to an embodiment of the present invention. The wire 1 for elastic members shown in FIG. 1 is used as a suspension spring for a suspension of an automobile, for example, by forming a coil spring by winding a wire formed by winding a fiber around a core material in a spiral shape.

  The elastic member wire 1 includes a core material 10 made of a thermoplastic resin and a fiber reinforced plastic (FRP) layer 11 including a plurality of fibers wound around the core material 10 and covering the core material 10. And spiral.

  The core material 10 is formed using a thermoplastic resin that is lighter than an iron-based material such as cast iron, for example, a polyolefin-based resin, a polyester-based resin, a polyamide-based resin, or the like. More specifically, examples of the polyolefin resin include polypropylene and high density polyethylene (HDPE), examples of the polyester resin include polyethylene terephthalate (PET), and examples of the polyamide resin include nylon 6 Is mentioned. In the present embodiment, the cross section of the core material 10 is described as a circle, but may be an ellipse or a polygon.

  The FRP layer 11 is a layer formed by winding a plurality of reinforcing fibers around the core material 10. As the reinforcing fiber, at least one fiber selected from carbon fiber, glass fiber, aramid fiber that is an aromatic polyamide fiber, and basalt fiber that is a basalt fiber is used.

  Adjacent reinforcing fibers are fixed to each other with a thermosetting resin. Examples of the thermosetting resin include a resin that is cured by heat at a temperature lower than the melting point of the core material 10, for example, an epoxy resin.

  In the FRP layer 11, the high melting point resin fibers are fixed to the core material 10 by the low melting point resin fibers, and the reinforcing fibers located on the core material 10 side are fastened by the high melting point resin fibers and fixed to the core material 10. . The high melting point resin fiber is a thermoplastic resin having a melting point higher than the curing temperature of the thermosetting resin described above, and specifically, polypropylene, a high melting point polyester resin, nylon in combination with the thermosetting resin. 66 or the like.

  The core material 10 and the FRP layer 11 are fixed to each other with a low melting point thermoplastic resin. The low melting point thermoplastic resin here is a thermoplastic resin having a melting point equal to or lower than the curing temperature of the above-described thermosetting resin, and specifically, a high-density polyethylene (HDPE) by combination with the thermosetting resin. ), Low density polyethylene (LDPE), low melting point copolymerization olefin resin, nylon 12, low melting point polyester resin, and the like.

  That is, the FRP layer 11 includes the above-described plurality of reinforcing fibers, a thermosetting resin that fixes the reinforcing fibers, a high-melting point resin fiber that fixes the reinforcing fibers on the core material 10 side, the FRP layer 11 and the core. And a low melting point thermoplastic resin to which the material 10 is fixed. The high-melting point resin fiber and the low-melting point thermoplastic resin may be a single core-sheath type resin fiber by covering the outer periphery of the high-melting point resin fiber with a low-melting point thermoplastic resin. Also good.

  The reinforcing fiber in the FRP layer 11 may be one in which fibers are wound around the core material 10 one by one, or a plurality of fibers are bundled, and one bundle is wound around the core material 10 at a time. It may be. In any winding, the winding direction of each fiber is aligned. Further, a fiber bundle in the form of a sheet may be provided on the outer surface of the core material 10 with the longitudinal direction of the fibers aligned. Further, one or a plurality (including a bundle) of reinforcing fibers are wound around the radial direction of the wire.

  In addition, it is preferable that the same resin system is used for the core material 10, the low melting point thermoplastic resin, and the high melting point resin fiber in the wire member 1 for elastic members. The same resin system means a resin having the same system. For example, when a polyolefin resin is used as the core material 10, a low melting point polyolefin resin is used for the low melting point thermoplastic resin, and a high melting point polyolefin resin is used for the high melting point resin fiber.

  Then, the manufacturing method of the wire 1 for elastic members which concerns on this Embodiment is demonstrated with reference to FIGS. 2-6 is a figure explaining the manufacturing method of the wire for elastic members which concerns on one embodiment of this invention.

  First, the reinforcing fiber 111 impregnated with a liquid thermosetting resin in advance is wound around the core material 10 (see FIG. 2, first step). The reinforcing fibers 111 are wound around the core material 10 at a predetermined pitch, and in the wire material (first intermediate wire material) after the reinforcing fibers 111 are wound, a part of the core material 10 is exposed to the outside. It has become.

  After the reinforcing fiber 111 is wound around the core material 10, the resin fiber 112 containing the high melting point resin fiber and the low melting point thermoplastic resin is wound around the wire (see FIG. 3, second step). FIG. 4 is a diagram for explaining a method for manufacturing a wire for an elastic member according to an embodiment of the present invention, and is a diagram for explaining a high melting point resin fiber and a low melting point thermoplastic resin. In the present embodiment, as shown in FIG. 4, the core-sheath type resin fiber 112 in which the outer periphery of the high melting point resin fiber (high melting point resin layer 112a) is covered with the low melting point thermoplastic resin (low melting point resin layer 112b). However, when the high-melting point resin fiber and the low-melting point thermoplastic resin are separate fibers, they are wound around the wire. The resin fiber 112 is wound in a direction opposite to the winding direction of the reinforcing fiber 111. For this reason, the reinforcing fiber 111 and the resin fiber 112 are wound around the core material 10 so as to intersect. The resin fibers 112 are wound at a predetermined pitch in the same manner as the reinforcing fibers 111. Accordingly, the wound wire (second intermediate wire) is in a state in which a part of the core material 10 and a part of the reinforcing fiber 111 are exposed to the outside. In the second intermediate wire, at least a part of the reinforcing fiber 111 may be exposed to the outside from the viewpoint of fixing the FRP layer 11 to the core member 10.

  Thereafter, the reinforcing fiber 113 impregnated with a liquid thermosetting resin in advance is wound around the core material 10 (see FIG. 5, third step). The reinforcing fibers 113 are wound without leaving an interval (adjacent reinforcing fibers are in close contact with each other). The reinforcing fibers 113 are wound in an overlapping manner until the thickness of the core material 10 in the radial direction reaches a predetermined thickness. The fibers of the reinforcing fibers 113 are preferably the same fibers as the fibers of the reinforcing fibers 111.

  After winding the reinforcing fiber 113, the wire (third intermediate wire) is at or above the temperature at which the thermosetting resin of the reinforcing fiber 111 and the reinforcing fiber 113 is cured, and below the melting point of the high melting point resin fiber. Heat at temperature (heating step). At the time of heating, first, the low-melting point thermoplastic resin melts and contacts the core material 10. Thereafter, the thermosetting resin is cured, so that the adjacent reinforcing fibers 111, the reinforcing fibers 113, the reinforcing fibers 111, and the reinforcing fibers 113 are fixed. When the temperature of the wire returns to room temperature after heating, the low-melting point thermoplastic resin is cooled below the melting point, so that the low-melting point thermoplastic resin is solidified and the low-melting point thermoplastic resin is fused to the core member 10.

As shown in FIG. 6, the FRP layer 11 in the wire obtained after cooling is formed on the core material 10 side, and includes a high melting point resin fiber, a low melting point thermoplastic resin, and a thermosetting resin and a reinforcing fiber corresponding to the reinforcing fiber 111. an inner layer R ₁₁ comprising, formed on the outer side of the inner layer R _11, an outer layer R ₁₂ containing a thermosetting resin and reinforcing fibers according to the reinforcing fibers 113 have. Strictly speaking, constituent elements of each layer are mixed at the boundary between the inner layer R ₁₁ and the outer layer R ₁₂ , for example, the inner layer R ₁₁ includes the reinforcing fiber 113, or the reinforcing fiber 111 and the reinforcing fiber. Each fiber 113 is fixed by a thermosetting resin.

  By the above-described treatment, the above-described plurality of reinforcing fibers, the thermosetting resin that fixes the reinforcing fibers, the high-melting point resin fiber that fixes the reinforcing fibers on the core material 10 side, the FRP layer 11 and the core material 10. An FRP layer 11 containing a low melting point thermoplastic resin that adheres to the elastic member is formed, and the elastic member wire 1 shown in FIG. 1 can be obtained.

  In addition, as a method of winding reinforcing fibers or the like around the core material 10, for example, a filament winding method (Filament Winding) can be cited. When a fiber bundle in which a plurality of fibers form a sheet is used, it is formed by a sheet winding method (Sheet Winding).

  If this elastic member wire 1 is wound, a coil spring can be produced. This coil spring is used, for example, as a suspension spring for an automobile suspension. In addition, a part of the elastic member wire 1 can be bent and used as an elastic member such as a torsion bar or a stabilizer.

  According to the embodiment of the present invention described above, in the elastic member wire 1 including the core material 10 and the FRP layer 11, the FRP layer 11 has a plurality of reinforcing fibers and heat for fixing the reinforcing fibers to each other. Since the curable resin, the high melting point resin fiber for fixing the reinforcing fiber on the core material 10 side, and the low melting point thermoplastic resin for fixing the FRP layer 11 and the core material 10 are included, Strength can be improved.

  In addition, according to one embodiment of the present invention, the winding of the reinforcing fiber 111 in which the core-sheath resin fiber 112 in which the outer periphery of the high melting point resin fiber is covered with the low melting point thermoplastic resin is wound around the core material 10 is wound. Winding in a direction opposite to the direction, only the low-melting point thermoplastic resin is melted and fused to the core material 10 by heating, and the high-melting point resin fiber remains in a state where the reinforcing fiber 111 is tightened. The fiber 111 can be firmly fixed to the core material 10.

  Further, according to one embodiment of the present invention, the core-sheath resin fiber 112 in which the outer periphery of the high melting point resin fiber is covered with the low melting point thermoplastic resin is wound at a predetermined pitch, and the reinforcing fiber 113 is wound. Since the reinforcing fiber 111 and the reinforcing fiber 113 are brought into contact with each other when rotated, the reinforcing fiber 111 and the reinforcing fiber 113 fixed to the core material 10 are fixed by the thermosetting resin. The reinforcing strength of the reinforcing fiber 113 can be increased.

  According to one embodiment of the present invention, the core material 10, the low-melting point thermoplastic resin, and the high-melting point resin fiber are made of the same resin system, so that the affinity for each other increases, and the low-melting point thermoplastic resin Even when melted, the low melting point thermoplastic resin is retained by the high melting point resin fiber. Thereby, the strength for fixing the reinforcing fiber on the core material 10 side with the high melting point resin fiber and the strength for fixing the FRP layer 11 and the core material 10 with the low melting point thermoplastic resin can be secured, and the reinforcing fiber 111 is The state pressed against the core material 10 can be maintained.

  Hereinafter, the Example of the wire for elastic members which concerns on this invention is described. First, the manufacturing method and structure of the elastic member wire according to the present embodiment will be described.

Example 1
As the mandrel, a core material (melting point: 168 ° C.) made of polypropylene (PP) having a diameter of 7 mm and a length in the longitudinal direction of 3000 mm was used. Two fiber bundles of carbon fibers impregnated with a mixture of an epoxy resin, which is a thermosetting resin, and an epoxy resin curing agent are passed through a guide of φ10 mm so that each width is about 5 mm, and the distance between the two fiber bundles Was adjusted to be about 5 mm, and the fiber bundle was wound from one end to the other end while maintaining the state in which the fiber bundle stretching direction was + 45 ° with respect to the longitudinal direction of the core. . Thereafter, a fiber mixed bundle of LDPE yarn (melting point: 95 to 135 ° C.) as a low melting thermoplastic fiber and PP fiber (melting point: 168 ° C.) as a high melting thermoplastic fiber from above, An interval of about 10 mm from the other end of the core to one end is maintained while maintaining a state in which the drawing direction of the fiber mixed bundle is −45 ° with respect to the longitudinal direction of the core (opposite to the carbon fiber). Wrapped to become. Further, a fiber bundle of carbon fibers impregnated with a mixed solution of an epoxy resin that is a thermosetting resin and an epoxy resin curing agent is laminated thereon, and an uncured wire having a uniform outer diameter of about φ18 mm. A carbon fiber reinforced plastic (CFRP) wire was molded. Then, with one end of the wire fixed to the ceiling of the oven and a tensile load applied to the other end of the wire with a wire fixed to the bottom of the oven, heated at 100 ° C. for 1 hour and then heated at 150 ° C. for 4 hours Cured. Thus, the elastic member wire of Example 1 was obtained. A filament winder was used for winding the fiber bundle or fiber mixed bundle. Table 1 shows the configuration of the elastic member wire according to the first embodiment.

(Example 2)
Instead of the “fiber mixture bundle of LDPE yarn as a low melting thermoplastic fiber and PP fiber as a high melting thermoplastic fiber” used in Example 1, a low melting copolymer olefin resin (melting point 145 ° C.) and PP-fiber (melting point: 168 ° C.). The other conditions were the same as in Example 1, and the elastic member wire of Example 2 was obtained. Table 1 shows the configuration of the elastic member wire according to the second embodiment.

(Example 3)
HDPE yarn (melting point: 135 ° C.) was used instead of “LDPE yarn as a low melting thermoplastic fiber” used in Example 1, and HDPE core material (melting point) instead of PP core material. : 135 ° C.). The other conditions were the same as in Example 1, and the elastic member wire of Example 3 was obtained. In Table 1, the structure of the wire for elastic members which concerns on Example 3 is shown.

Example 4
Instead of “LDPE yarn as low melting thermoplastic fiber” used in Example 1, nylon 12 yarn (melting point: 176 ° C.) was used, and “PP fiber as high melting thermoplastic fiber” was used instead. Nylon 66 fiber (melting point: 265 ° C.) was used, and a core material made of nylon 6 (melting point: 225 ° C.) was used instead of the PP core material. In Example 4, the heat-curing conditions were set at 100 ° C. for 1 hour and then heat-cured at 180 ° C. for 4 hours. The other conditions were the same as in Example 1, and the elastic member wire of Example 4 was obtained. In Table 1, the structure of the wire for elastic members which concerns on Example 4 is shown.

(Example 5)
A low melting polyester resin yarn (melting point: 160 ° C.) was used instead of the “nylon 12 yarn” used in Example 4, and a high melting polyester resin (melting point: 250 ° C.) was used instead of the “nylon 66 fiber”. In place of the nylon 6 core material, a PET core material (melting point: 255 ° C.) was used. Other conditions were the same as in Example 4 to obtain the elastic member wire of Example 5. Table 1 shows the configuration of the elastic member wire according to the fifth embodiment.

(Comparative Example 1)
As in Example 1, a PP core material having a diameter of 7 mm and a length in the longitudinal direction of 3000 mm was used as a mandrel. Two fiber bundles of carbon fibers impregnated with a mixture of an epoxy resin, which is a thermosetting resin, and an epoxy resin curing agent are passed through a guide of φ10 mm so that each width is about 5 mm, and the distance between the two fiber bundles The fiber bundle is adjusted so that the stretching direction of the fiber bundle is + 45 ° with respect to the longitudinal direction of the core material while the outer diameter of the wire becomes a uniform φ of about 18 mm. Were laminated to form an uncured CFRP wire. The other conditions were the same as in Example 1, and the elastic member wire of Comparative Example 1 was obtained. Table 1 shows the configuration of the elastic member wire according to Comparative Example 1.

(Comparative Example 2)
An LDPE film (thickness 10 μm) is wrapped around the PP core material of φ7 mm and the length in the longitudinal direction of 3000 mm used in Comparative Example 1, and this layer is intermediate between the core material and the FRP layer. Layered. The other conditions were the same as in Comparative Example 1, and the elastic member wire of Comparative Example 2 was obtained. Table 1 shows the configuration of the elastic member wire according to Comparative Example 2.

  Subsequently, test contents according to the present example will be described.

(Pullout resistance test)
The elastic member wire obtained as described above was cut into a length of 400 mm, and a core material pull-out test was performed on the cut specimen. In the pull-out test, the pull-out resistance was measured using a force gauge. Table 1 shows the pulling resistance test result of the elastic member wire.

  Next, the pulling resistance test result of the elastic member wire according to the present embodiment will be described. The elastic member wires according to Examples 1 to 5 had a pulling resistance of 7 to 20 N, whereas the elastic member wires according to Comparative Examples 1 and 2 had a pulling resistance of 2 N or less. Thereby, in the present Examples 1-5, it turns out that the core material and FRP layer in the wire for elastic members are firmly fixed. From this result, as in the above-described embodiment, the FRP layer includes a plurality of reinforcing fibers, a thermosetting resin that fixes the reinforcing fibers to each other, and a high melting point resin fiber that fixes the reinforcing fibers on the core side. It can be said that pulling resistance between the core material and the FRP layer is improved by including the FRP layer and the low-melting point thermoplastic resin to which the core material is fixed.

  As described above, the present invention can include various embodiments and the like not described herein, and various design changes and the like can be made without departing from the technical idea specified by the claims. It is possible.

  As described above, the elastic member wire manufacturing method, elastic member wire, and elastic member according to the present invention are suitable for improving the strength while reducing the weight.

DESCRIPTION OF SYMBOLS 1 Wire material for elastic members 10 Core material 11 Fiber reinforced plastic (FRP) layer 111,113 Reinforcement fiber 112 Resin fiber 112a High melting point resin layer 112b Low melting point resin layer

Claims (11)

A first step of producing a first intermediate wire by wrapping a first reinforcing fiber impregnated with a liquid thermosetting resin around the core so that the core made of a thermoplastic resin is exposed to the outside;
The first reinforcing fiber has a high melting point resin fiber having a melting point higher than the curing temperature of the thermosetting resin and a low melting point thermoplastic resin having a melting point lower than the melting point of the high melting point resin fiber. A second step of winding the first intermediate wire so as to be exposed to produce a second intermediate wire;
A third step of winding a second reinforcing fiber impregnated with a liquid thermosetting resin around the second intermediate wire to produce a third intermediate wire;
A heating step of heating the third intermediate wire to the curing temperature or the higher of the melting point of the low-melting point thermoplastic resin to a temperature higher than the melting point of the high-melting point resin fiber;
The manufacturing method of the wire for elastic members characterized by including. In the second step, the low-melting point thermoplastic resin wraps a core-sheath type composite fiber covering an outer periphery of the high-melting point resin fiber around the first intermediate wire to produce a second intermediate wire. The manufacturing method of the wire for elastic members of Claim 1 characterized by the above-mentioned. In the second step, the low-melting point thermoplastic resin and the high-melting point resin fibers that are independent of each other are wound around the first intermediate wire to produce a second intermediate wire. Item 2. A method for producing a wire for an elastic member according to Item 1. The melting point temperature of the low-melting thermoplastic resin is lower than the curing temperature,
The method for producing a wire for an elastic member according to any one of claims 1 to 3, wherein the heating step is performed at a temperature equal to or higher than the curing temperature and lower than a melting point of the high melting point resin fiber. . A core made of thermoplastic resin;
A plurality of reinforcing fibers wound around the core material, and a fiber layer covering the core material;
With
The fiber layer is
The plurality of reinforcing fibers;
A thermosetting resin that bonds the reinforcing fibers together;
A high melting point resin fiber that is wound around the core material so as to intersect with the reinforcing fiber positioned on the core material side among the plurality of reinforcing fibers, and fixes the reinforcing fiber positioned on the core material side to the core material When,
A low-melting point thermoplastic resin for fixing the fiber layer and the core material;
The wire for elastic members characterized by including. The elastic member wire according to claim 5, wherein the reinforcing fiber is at least one fiber selected from a carbon fiber, a glass fiber, an aramid fiber, and a basalt fiber. The wire for an elastic member according to claim 5 or 6, wherein the core material is made of polypropylene. The wire for an elastic member according to any one of claims 5 to 7, wherein the thermosetting resin is an epoxy resin. The said core material, the said low melting-point thermoplastic resin, and the said high melting-point resin fiber are formed using the same resin system. For elastic members as described in any one of Claims 5-8 characterized by the above-mentioned. wire.   The elastic member formed using the wire for elastic members as described in any one of Claims 5-9.   The elastic member according to claim 10, wherein the elastic member wire is wound spirally.

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