WO2017073771A1

WO2017073771A1 - Wire rod for elastic member, and elastic member

Info

Publication number: WO2017073771A1
Application number: PCT/JP2016/082172
Authority: WO
Inventors: 和彦許斐; 勝今村; 孝充佐野
Original assignee: 日本発條株式会社
Priority date: 2015-10-29
Filing date: 2016-10-28
Publication date: 2017-05-04
Also published as: JP2017081048A

Abstract

This wire rod for an elastic member is used for manufacturing an elastic member, and is equipped with: a core material having a first tube body having a spiral shape and formed using a long member, and a second tube body having a spiral shape and formed using a long member, and covering the first tube body; and a fiber-reinforced plastic (FRP) layer that is formed using reinforced fibers wrapped around the core material, and that covers the outer surface of the core material. The first and second tube bodies are wound in mutually opposite directions with respect to the center axis of the wire rod for an elastic member. In addition, the adjacent winding directions of the second tube body and the reinforced fibers located in the innermost layer of the FRP layer are in mutually opposite directions with respect to the center axis of the wire rod for an elastic member.

Description

Wire for elastic member and elastic member

The present invention relates to an elastic member wire and an elastic member.

Conventionally, weight reduction of various parts has been pursued as one 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 an elastic member wire that can reduce the weight of an elastic member such as a coil spring or a torsion bar, a hollow wire, a titanium wire having a low specific gravity, a carbon fiber having a lighter weight effect than the above-mentioned wire, etc. Examples include CFRP wire for elastic members formed using reinforcing fibers (see, for example, Patent Documents 1 and 2).

Patent Document 1 discloses a flexible core wire, a reinforcing fiber layer wound so that the angle of the core wire with respect to the axial direction is 15 ° to 80 °, or −80 ° to −15 °, and a core wire. A coil spring using a wire for an elastic member made of a thermosetting resin matrix that joins a reinforcing fiber layer is described.

In Patent Document 2, aluminum is used as a core material, and a wire for an elastic member provided with a CFRP layer formed by winding a mesh-like reinforcing fiber in which a plurality of carbon fibers are knitted around the outer periphery of the aluminum core material. Is disclosed.

JP 58-28029 A Japanese Utility Model Publication No. 55-45076

In producing an elastic member using such a wire for an elastic member, when a solid core wire such as the wire for an elastic member disclosed in Patent Documents 1 and 2 is used, a large force is applied when the wire is bent. Since it requires, moldability will fall.

Further, when the fibers are wound around the core material in a mesh shape as in Patent Document 2, the fibers are likely to buckle and break when torsional stress is applied, so the wire diameter must be increased to ensure strength. Therefore, there is a possibility that a sufficient weight reduction effect cannot be obtained.

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

In order to solve the above-described problems and achieve the object, an elastic member wire according to the present invention is an elastic member wire for producing an elastic member, and is a spiral formed using a long member. A first tube body having a shape and a spiral formed using a long member, and having a second tube body covering the first tube body, and wound around the core material An FRP layer that covers the outer surface of the core material, and the first and second tube bodies are wound with respect to the central axis of the elastic member wire. The reinforcing fibers located in the innermost layers of the second tube body and the FRP layer are opposite to each other, and the winding directions of the adjacent reinforcing fibers are mutually relative to the central axis of the elastic member wire. It is the opposite direction.

In the wire for an elastic member according to the present invention as set forth in the invention described above, the first and second tube bodies each have a constant angle between the winding center axis and the winding direction. And

In the elastic member wire according to the present invention, in the above invention, the first and second tube bodies are each formed by spirally winding a band-shaped member and formed along the longitudinal direction. Is smaller than the width of the band-shaped member.

In the elastic member wire according to the present invention, in the above invention, the first and second tube bodies are each formed of steel, an alloy mainly composed of aluminum, magnesium, or titanium, or FRP. It is characterized by being.

Further, in the wire for an elastic member according to the present invention, in the above invention, the first and second tube bodies may have a rectangular shape, a circular shape, an elliptical shape, or a polygonal shape formed by the outer circumference viewed from the longitudinal direction of each member. It is characterized by making.

Further, the elastic member wire according to the present invention is characterized in that, in the above invention, the long member has a rectangular, circular, elliptical or polygonal cross section perpendicular to the longitudinal direction.

The wire for an elastic member according to the present invention is provided with a resin core provided in the first tube body and wound around the first tube body in the above invention. It is characterized by.

Moreover, the wire for an elastic member according to the present invention is characterized in that, in the above invention, the wire is provided using an insulating material and includes an electrolytic corrosion prevention portion provided between the core material and the reinforcing fiber. To do.

Moreover, the wire for an elastic member according to the present invention is the above-described invention, wherein the reinforcing fiber is wound at least in the direction in which the reinforcing fiber on the outer surface is wound around the core material according to a load applied from the outside. It is the direction along the direction of the tensile load applied to the wire for elastic members.

Further, in the elastic member wire according to the present invention, in the above invention, the FRP layer includes a thermosetting resin for fixing the reinforcing fibers, and the second tube body has the thermosetting on an outer surface. The surface treatment which improves adhesiveness with adhesive resin is given.

Moreover, the wire for an elastic member according to the present invention is characterized in that, in the above invention, the reinforcing fibers are continuous along a circumferential direction with respect to the core material.

The elastic member according to the present invention is characterized by using the wire for an elastic member according to the above invention.

Further, in the above invention, the elastic member according to the present invention is a torsion bar, a stabilizer or a frame for automobiles.

According to the present invention, it is possible to improve the moldability and 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 the configuration of the elastic member wire according to the embodiment of the present invention. FIG. 3A is a schematic diagram illustrating a configuration of a main part of a wire for an elastic member according to an embodiment of the present invention. FIG. 3B is a schematic diagram showing a configuration of a main part of the wire for an elastic member according to the 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. FIG. 7 is a schematic diagram showing the configuration of the elastic member wire according to the modification of the embodiment of the present invention. FIG. 8 is a schematic diagram for explaining the porosity according to the embodiment of the present invention.

Hereinafter, modes 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. FIG. 2 is a diagram illustrating the configuration of the elastic member wire according to the embodiment of the present invention, and is a view of the elastic member wire shown in FIG. 1 as viewed from the longitudinal direction. The wire 1 for elastic members shown in FIGS. 1 and 2 is used as an elastic member, for example, a stabilizer for a car, a torsion bar or a frame, which is formed by winding a fiber around a core material and bending the fiber to bend.

The elastic member wire 1 includes a core material 10 formed using a metal, an alloy, or a fiber reinforced plastic (FRP), and a plurality of reinforcing fibers wound around the core material 10. And an FRP layer 11 to be covered. Hereinafter, the elastic member wire 1 may be simply referred to as a wire.

The core material 10 is formed using a long belt-like member. In the present embodiment, the band-shaped member is described as having a rectangular (rectangular) cross section orthogonal to the longitudinal direction. However, the band-shaped member has a circular shape, an elliptical shape, or a polygonal shape (including a square shape). There may be. Moreover, although the core material 10 demonstrates as what the shape which outer periphery sees from the center axis | shaft N1 direction of winding makes a circle, it may make a rectangle, an ellipse shape, or a polygonal shape. The core member 10 includes an inner peripheral spiral tube 10a that is spirally wound, and an outer peripheral spiral tube 10b that is formed by spirally winding a band-shaped member and covers the inner peripheral spiral tube 10a. Examples of the material constituting the inner peripheral side spiral tube 10a and the outer peripheral side spiral tube 10b include a lightweight alloy such as an alloy mainly composed of aluminum, magnesium, or titanium, and FRP. Further, since the spiral tube is lighter than the solid core, a heavy metal such as a steel material or a hard steel wire can be used. The shapes of the inner circumferential spiral tube 10a and the outer circumferential spiral tube 10b will be described later. In addition, the inner peripheral side spiral tube 10a and the outer peripheral side spiral tube 10b may be continuous at one end side, that is, may be formed by using one strip-shaped member.

The inner circumferential spiral tube 10a and the outer circumferential spiral tube 10b are each formed by an angle (hereinafter, also referred to as a winding angle) between a winding central axis (for example, the central axis N1 shown in FIG. 2) and a winding direction. ) Are wound at different angles. For example, when the winding angle of the inner circumferential spiral tube 10a is an angle in the range of 20 ° or more and 85 ° or less upward with respect to the central axis N1 when viewed from the direction orthogonal to the central axis N1, the outer circumferential spiral tube 10b. Is wound in such a manner that the winding angle is in the downward range of −85 ° or more and −20 ° or less. Here, “upward” and “downward” refer to the direction in which the member extends by winding with respect to the central axis N1 extending in a predetermined direction, for example.

In addition, the inner circumferential side spiral tube 10a and the outer circumferential side spiral tube 10b may be wound at a certain angle, although the angle formed by the central axis N1 and the direction of partial winding may be different. Is preferred. The “certain angle” here includes an error of a winding angle in manufacturing.

Further, the core material 10 may be subjected to rust prevention treatment in the inner circumferential spiral tube 10a and the outer circumferential spiral tube 10b. Specifically, a rust prevention treatment is performed by applying a rust preventive agent to the surfaces of the inner peripheral spiral tube 10a and the outer peripheral spiral tube 10b. Moreover, as for the core material 10, the outer periphery may have the coating layer which consists of resin which consists of insulating materials, or FRP.

Further, the core material 10 may be provided with a resin core inside the inner circumferential spiral tube 10a, or may be filled with resin inside the inner circumferential spiral tube 10a. A lid that closes the opening may be provided. Thereby, the entrance of foreign matter into the inner peripheral spiral tube 10a can be prevented.

The FRP layer 11 is a layer formed by winding a plurality of reinforcing fibers 12 around the core material 10. As the reinforcing fiber 12, at least one fiber selected from carbon fiber, glass fiber, an aramid fiber that is an aromatic polyamide fiber, and a basalt fiber that is a basalt fiber is used.

In the FRP layer 11, at least some of the reinforcing fibers 12 (adjacent reinforcing fibers) are fixed to each other with a thermosetting resin. That is, the FRP layer 11 includes the plurality of reinforcing fibers 12 described above and a thermosetting resin that fixes the reinforcing fibers 12 to each other. Examples of the thermosetting resin include resins that are cured by heat at a temperature lower than the melting point of the inner peripheral spiral tube 10a, the outer peripheral spiral tube 10b, and the reinforcing fibers 12, such as epoxy resins. A thermoplastic resin may be used instead of the thermosetting resin.

The reinforcing fiber 12 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 a plurality of bundles are wound around the core material 10. 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. One or more reinforcing fibers are wound around the radial direction of the wire.

Further, it is preferable that the reinforcing fiber 12 is continuous from one end to the other end of the wire in terms of improving the strength of the elastic member wire 1 (FRP layer 11). When the reinforcing fiber 12 is discontinuous, a load applied from the outside cannot be borne by the entire wire, and stress concentrates on the discontinuous portion and tends to be a starting point of the wire. When the reinforcing fibers 12 are continuous from one end to the other end of the wire, each reinforcing fiber 12 extends spirally from one end to the other end of the wire and is continuous along the circumferential direction with respect to the core material 10.

Further, the winding direction in which the reinforcing fiber 12 located in the innermost layer of the FRP layer 11 among the reinforcing fibers 12 is wound around the core material 10 (the direction in which the reinforcing fiber 12 is wound: the winding direction Y1 in FIG. 1) and the center. The angle formed by the axis N1 (hereinafter also referred to as a winding angle or a winding angle) is FRP among the reinforcing fibers 12 when the winding angle of the outer circumferential spiral tube 10b is in the range of 20 ° to 85 °. The reinforcing fiber 12 located in the innermost layer of the layer 11 is wound so that the winding angle of the reinforcing fiber 12 is an angle in a range larger than −90 ° and smaller than 0 °, desirably around −45 °. On the other hand, when the winding angle of the outer peripheral side spiral tube 10b is in the range of −85 ° or more and −20 ° or less, the winding of the reinforcing fiber 12 located in the innermost layer of the FRP layer 11 among the reinforcing fibers 12 is wound. Winding is performed so that the angle is in the range of greater than 0 ° and less than 90 °, preferably around 45 °.

In addition, the winding direction of the reinforcement fiber 12 laminated | stacked on the radial direction (direction orthogonal to the central axis N1) of the elastic member wire 1 may be a mutually reverse direction (± (theta)). However, it may have a stitch shape. When the winding directions of the reinforcing fibers 12 are opposite to each other (± θ), when one layer side is wound at a winding angle in a range larger than 0 ° and smaller than 90 °, the other is −90 °. Winding is performed so that the winding angle is larger and smaller than 0 °.

In the reinforcing fiber 12, it is preferable that at least the winding direction Y1 of the reinforcing fiber 12 on the outer surface is a direction along the direction of a tensile load that is a load applied to the wire when a load is applied from the outside. FIG. 3A and FIG. 3B are schematic views showing the configuration of the main part of the elastic member wire according to one embodiment of the present invention, and when the torsional stress is applied to the elastic member wire 1, the surface of the wire It is a figure explaining the load added to. When the torsional stress is applied to the elastic member wire 1 around the central axis of the elastic member wire ₁ and the loads F ₁ and F ₂ are opposite to each other, the surface of the elastic member wire 1 3A, shear stress τ ₁₁ , τ ₁₂ , τ ₂₁ , and τ ₂₂ shown in FIG. 3A are applied to the fine region M. When the shear stress τ ₁₁ , τ ₁₂ , τ ₂₁ , τ ₂₂ is applied to the wire, in other words, a tensile load F _T and a compressive load F _C as shown in FIG. 3B are applied to the fine region M. . Like the elastic members wire 1, the elastic members Reversed stressed, because the reverse rotation of the torsional stress is applied to the load F _1, F _2, and the load F _T tensile, tensile perpendicular to the tensile load F _T A tensile load in two directions of load is applied. In contrast, such as compression coil springs or tension coil spring, elastic member direction is applied is pulsating stresses that in one direction of twist is tensile load F _T becomes only one direction.

In the elastic member wire 1 according to the present embodiment, the inner peripheral side spiral tube 10a, the outer peripheral side spiral tube 10b, and the reinforcing fiber 12 are adjacent to each other or between the outer peripheral side spiral tube 10b and the reinforcing fiber 12, the FRP layer. The winding directions of the reinforcing fibers 12 located in the innermost layer of 11 need only be different and cross each other.

As described above, when the inner circumferential spiral tube 10a and the outer circumferential spiral tube 10b intersect with each other, a load applied from different directions, for example, a load applied from a certain direction and a load applied from the opposite direction is applied. The outer periphery side spiral tube 10b is deformed in the direction in which the diameter is expanded, thereby suppressing the diameter reduction of the FRP layer 11, or the inner periphery side spiral tube 10a is deformed in the direction in which the diameter is expanded. The diameter reduction of the side spiral tube 10b can be suppressed, and the diameter reduction of the FRP layer 11 can be suppressed via the outer peripheral side spiral tube 10b.

In the elastic member wire 1 according to the present embodiment, the diameter (outer diameter) formed by the outer periphery of the core member 10 is R ₁ , and the diameter formed by the outer periphery of the FRP layer 11, that is, the outer diameter of the elastic member wire 1 is R _2. (See FIG. 2), it is preferable that 0 <R ₁ / R ₂ <0.8 is satisfied in terms of reducing the weight of the elastic member wire 1.

The elastic member wire 1 according to the present embodiment has a wire rigidity of 10 GPa or more and 50 GPa or less as strength when the elastic member wire 1 is used as a wire for an automobile stabilizer, torsion bar or frame, The static torsional strength is preferably 450 MPa or more and 2000 MPa or less.

Subsequently, a method for manufacturing the elastic member wire 1 according to the present embodiment will be described with reference to FIGS. 4 to 6 are views for explaining a method of manufacturing the elastic member wire according to the embodiment of the present invention.

First, production of the core material 10 will be described. The outer peripheral spiral tube 10b is wound around the inner peripheral spiral tube 10a shown in FIG. At this time, the winding direction Y11 of the inner circumferential spiral tube 10a and the winding direction Y12 of the outer circumferential spiral tube 10b are different from each other (see FIG. 6). In the present embodiment, it is assumed that the directions are opposite to each other (± θ with respect to the central axis of each spiral tube).

The core material 10 can be obtained by winding the outer circumferential spiral tube 10b around the inner circumferential spiral tube 10a (see FIG. 5). At this time, the inner peripheral spiral tube 10a and the outer peripheral spiral tube 10b are each formed by spirally winding a band-shaped member, and the interval between the band-shaped members formed along the longitudinal direction (axial direction of winding) is It is preferable from the viewpoint of improving the strength of the core material 10 that it is smaller than the width of the belt-like member. Further, in FIG. 5, the inner peripheral spiral tube 10a and the outer peripheral spiral tube 10b are separated from each other, but are separated for the sake of explanation, and in fact, both overlap in the radial direction orthogonal to the central axis. The parts are in contact. Moreover, as long as it is in the contact state as described above after assembly, the outer peripheral diameter of the inner peripheral spiral tube 10a before assembly may be larger than the inner peripheral diameter of the outer peripheral spiral tube 10b. In this case, the inner circumferential spiral tube 10a is fastened by the outer circumferential spiral tube 10b during assembly.

In addition, the outer peripheral side spiral tube 10b is subjected to a surface treatment for improving the adhesion between the outer surface and the thermosetting resin, thereby improving the adhesion between the core material 10 and the FRP layer 11. It is preferable in terms of improvement. Examples of the surface treatment include surface treatment by a physical method such as chemicals or blasting, surface coating treatment by a primer or a coupling agent, purification by plasma or ultraviolet rays, activation treatment, and the like.

Further, it is preferable that the inner peripheral spiral tube 10a and the outer peripheral spiral tube 10b are subjected to a treatment for applying a residual stress from the viewpoint of improving the strength of the core material 10. Examples of the process for imparting the residual stress include a quenching process and a tempering process as a process for changing the material characteristics such as a shot peening process.

Thereafter, the reinforcing fiber 12 previously impregnated with a liquid thermosetting resin is wound around the core material 10 (see FIG. 6). At this time, the winding direction Y12 of the outer peripheral side spiral tube 10b and the winding direction Y13 of the reinforcing fiber 12 are different from each other. The winding direction Y13 is the same as the winding direction Y11 described above.

After winding the reinforcing fiber 12, the temperature of the wire is higher than the temperature at which the thermosetting resin of the reinforcing fiber 12 is cured, and is lower than the melting point of the inner peripheral spiral tube 10a, outer peripheral spiral tube 10b, and reinforcing fiber 12. Heat with. When the thermosetting resin is cured by heating, the adjacent reinforcing fibers 12 are fixed to each other.

The FRP layer 11 including the core material 10 having the inner circumferential spiral tube 10a and the outer circumferential spiral tube 10b, the plurality of reinforcing fibers 12, and the thermosetting resin that fixes the reinforcing fibers 12 to each other by the above-described processing. , And the elastic member wire 1 shown in FIG. 1 can be obtained.

Moreover, since the inner circumferential spiral tube 10a and the outer circumferential spiral tube 10b are spiral members, it is possible to remove bubbles generated in the elastic member wire 1 also from the inside of the wire. It is possible to reduce the porosity of the wire and reduce the remaining of bubbles that cause a decrease in strength.

In addition, as a method of winding the reinforcing fiber 12 around the core material 10, for example, a filament winding method can be cited. In addition, when using the fiber bundle in which the some fiber has comprised the sheet form, it can also be formed by the sheet | seat winding (Sheet Winding) method.

It is possible to use a part of the elastic member wire 1 as an elastic member such as a torsion bar, a stabilizer or a frame by bending it.

According to the embodiment of the present invention described above, in the elastic member wire rod 1 including the core member 10 and the FRP layer 11, the inner peripheral spiral formed by winding the core member 10 so as to cross each other. Since the tube 10a and the outer periphery side spiral tube 10b have a cylindrical shape and the reinforcing fiber 12 is wound so as to intersect with the outer periphery side spiral tube 10b, the moldability is improved while reducing the weight by making it hollow. The strength against the shear fracture of the FRP layer 11 due to the reduced diameter of the wire 1 can be improved by the inner peripheral spiral tube 10a and the outer peripheral spiral tube 10b wound so as to cross each other. On the other hand, if it is a solid metal core, it is difficult to bend because it is difficult to bend, and once it is plastically deformed, it will remain slack, and even if it is hollow, it will be bent at the time of molding, resulting in poor molding.

(Modification of the embodiment)
When the reinforcing fiber 12 forming the FRP layer 11 includes even a part of the conductive fiber, the core material 10 and the FRP layer may be corroded because the core material 10 is made of metal. 11, an insulating material, for example, an insulating glass fiber reinforced plastic (GFRP) layer, or an electrolytic corrosion prevention layer (electric corrosion preventing portion) made of an insulating oxide film formed on the surface of the core material 10 is provided. It may be provided. FIG. 7 is a schematic diagram showing the configuration of the elastic member wire according to the modification of the present embodiment. In the elastic member wire 1 a shown in FIG. 7, an electrolytic corrosion prevention layer 13 made of an insulating material is provided between the core material 10 and the FRP layer 11. The electrolytic corrosion prevention layer 13 is formed of an insulating oxide film such as an insulating GFRP layer or an alumite layer. The thickness of the electric corrosion prevention layer 13 (the thickness in the radial direction of the core material 10) may be sufficient if insulating properties can be ensured. For example, the GFRP layer has a sufficient effect even if it is about 0.1 mm. By forming the galvanic corrosion prevention layer 13, the core material 10 can be prevented from being deteriorated by galvanic corrosion.

Hereinafter, examples of the wire for elastic member according to the present invention will be described. The present invention is not limited to these examples. First, the test content according to the present embodiment will be described.

(Torsion strength test)
A triaxial strain gauge was affixed to the wire, and the test was performed at a rotational speed of 0.3 ° / second around the central axis of the wire. By this torsion test, the static torsional strength of the wire (carbon fiber) was determined.

(Rigidity)
Rigidity was calculated based on the slope of the stress-strain diagram obtained by the torsional strength test described above.

(Porosity)
A cross section of the elastic member wire was photographed using a magnifying glass, and the porosity of the FRP layer was measured. FIG. 8 is a schematic diagram for explaining the porosity according to the embodiment of the present invention. As shown in FIG. 8, the porosity of the region R ₃ was measured as the inner porosity, and the porosity of the region R ₄ was measured as the outer porosity.

(Formability)
The ease of setting the elastic member wire to the mold was evaluated as follows. As the mold, a mold having a groove forming the shape of an experimental frame having a height of 700 mm, a width of 500 mm, and a corner radius of curvature (R) of 50 mm was used.
◎: Easy to set ○: Some resistance when set ×: Resistance when set

(Cross-sectional shape)
The stability of the dimensions of the elastic member wire was evaluated based on the cross-sectional shape. The change of the cross-sectional shape of the wire after resin hardening / demolding was confirmed.

Then, the manufacturing method and structure of the wire for elastic members which concern on a present Example are demonstrated.

Example 1
As a mandrel to be attached to the filament winding machine, a hard steel wire having a thickness of 1 mm was wound along the longitudinal direction to produce an inner peripheral side spiral tube having an outer diameter of φ5 mm. As the hard steel wire, a hard steel wire with a diameter of 3 mm was rolled to a thickness of 1 mm. Thereafter, a hard steel wire having a thickness of 1 mm was wound around the inner peripheral side spiral tube along the longitudinal direction to form an outer peripheral side spiral tube having an outer diameter of φ7 mm, thereby producing a core material. . At this time, the angle formed between the winding axis and the winding direction of the inner spiral tube is opposite to the angle formed between the winding axis and the winding direction of the outer spiral tube (± θ The winding angle of the inner spiral tube was about + 50 °, and the winding angle of the outer spiral tube was about -70 °. This was cut into a length of 3000 mm to obtain a core material of Example 1.

Next, an FRP layer was formed on the core material. Specifically, a fiber bundle of carbon fibers impregnated with a mixed solution of an epoxy resin that is a thermosetting resin and a crosslinking agent, the winding direction of the fiber bundle is + 45 ° with respect to the longitudinal direction of the core material. While maintaining the state made, the core material was wound without any gap from one end portion to the other end portion. Thereafter, while maintaining the same fiber mixed bundle from above, the winding direction of the fiber mixed bundle is −45 ° with respect to the longitudinal direction of the core (opposite to the first layer), It wound without gap from the end to one end. The + 45 ° layer and the −45 ° layer were alternately laminated to form an uncured carbon fiber reinforced plastic (CFRP) wire having a uniform outer diameter of φ14 mm. Thereafter, the characteristic measurement wire was heated at 100 ° C. and then cured at 150 ° C. in a state where a tensile load of about 500 grams was applied to the wire in an oven. Thus, the elastic member wire for characteristic measurement of Example 1 was obtained. Table 1 shows the configuration and test results of the elastic member wire according to Example 1.

(Example 2)
Example 2 An uncured carbon fiber reinforced plastic (CFRP) wire produced in Example 1 was inserted into a mold having a groove forming the shape of an experimental frame, sandwiched between molds having the same groove, and heated and cured in an oven. Got the frame. Table 1 shows the configuration and characteristics of the frame according to the second embodiment.

(Comparative Example 1)
A round bar made of a 5000 series aluminum material having an outer diameter of 7 mm was used as a mandrel. The other conditions were the same as in Example 1, and the elastic member wire of Comparative Example 1 was obtained. Further, using the elastic member wire of Comparative Example 1, a frame was produced by sandwiching it in a mold in the same manner as in Example 2. Table 1 shows the configuration and characteristics of the elastic member wire according to Comparative Example 1.

(Comparative Example 2)
A round bar made of a pure aluminum material having an outer diameter of 7 mm was used as a mandrel as a core material. The other conditions were the same as in Example 1, and the elastic member wire of Comparative Example 2 was obtained. Table 1 shows the configuration and characteristics of the elastic member wire according to Comparative Example 2. Using the elastic member wire of Comparative Example 2, a frame was produced by being sandwiched in a mold in the same manner as in Example 2.

(Comparative Example 3)
A round bar made of polypropylene (PP) having an outer diameter of 7 mm was used as a mandrel as a core material. The other conditions were the same as in Example 1, and the elastic member wire of Comparative Example 3 was obtained. Table 1 shows the configuration and characteristics of the elastic member wire according to Comparative Example 3.

(Comparative Example 4)
A cylindrical pipe made of pure aluminum material having an outer diameter of 7 mm and a thickness of 1 mm was used as a mandrel. The other conditions were the same as in Example 1, and the elastic member wire of Comparative Example 4 was obtained. Using the elastic member wire of Comparative Example 4, a frame was produced by sandwiching it in a mold in the same manner as in Example 2. Table 1 shows the configuration and characteristics of the elastic member wire according to Comparative Example 4.

(Comparative Example 5)
A cylindrical polypropylene (PP) pipe having an outer diameter of 7 mm and a thickness of 1 mm was used as a mandrel. The other conditions were the same as in Example 1, and the elastic member wire of Comparative Example 5 was obtained. Table 1 shows the configuration and properties of the elastic member wire according to Comparative Example 5.

Next, the characteristics of the elastic member wire according to the present embodiment will be described. The wire for an elastic member according to Examples 1 and 2 has substantially the same torsional strength and rigidity as compared with a wire made of a round bar made of an aluminum material (Comparative Examples 1 and 2). It can be said that the strength is high. Furthermore, the porosity of the inner and outer porosity was lower than those of Comparative Examples 1 to 5, and the remaining of bubbles could be reduced by using the spiral tube as the core material.

Moreover, the elastic member wire according to Example 1 was easily deformed, and could be easily fitted into the experimental frame mold, and the wire cross-sectional shape was not deformed (see the formability of Example 2). On the other hand, the wire for elastic members according to Comparative Examples 1, 2, and 4 has resistance when set to the frame mold, is difficult to be deformed and difficult to fit into the mold, the wire is deformed, and the pipe is used as a core material When bending, the pipe was bent and it was difficult to fit.

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

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

DESCRIPTION OF SYMBOLS 1 Wire material for elastic members 10 Core material 10a Inner circumference side spiral tube 10b Outer circumference side spiral tube 11 Fiber reinforced plastic (FRP) layer 12 Reinforced fiber 13 Electric corrosion prevention layer

Claims

An elastic member wire for producing an elastic member,
A first tube body having a spiral shape formed by using a long member, and a second tube body having a spiral shape formed by using a long member and covering the first tube body Having a core material;
Having a reinforcing fiber wound around the core material, and an FRP layer covering the outer surface of the core material;
With
The first and second tube bodies are wound in directions opposite to each other with respect to the central axis of the elastic member wire,
Elasticity characterized in that the reinforcing fibers located in the innermost layer of the second tube body and the FRP layer are wound in opposite directions with respect to the central axis of the elastic member wire rod. Wire for members.
2. The wire for an elastic member according to claim 1, wherein each of the first and second tube bodies has a constant angle between a winding center axis and a winding direction.
Each of the first and second tube bodies is formed by spirally winding a band-shaped member,
The spacing formed along the longitudinal direction is smaller than the width of the band-shaped member. The wire for an elastic member according to claim 1 or 2.
The first and second tube bodies are each formed of a steel material, an alloy containing aluminum, magnesium, or titanium as a main component, or FRP. The wire for elastic members as described in one.
The first and second tube bodies each have a rectangular shape, a circular shape, an elliptical shape, or a polygonal shape formed by the outer periphery of each member viewed from the longitudinal direction. The wire for elastic members as described in 2.
The elastic member wire according to any one of claims 1 to 5, wherein the elongated member has a rectangular, circular, elliptical, or polygonal cross section perpendicular to the longitudinal direction.
The resin core according to any one of claims 1 to 6, further comprising: a resin core provided inside the first tube body and wound around the first tube body. Wire material for elastic members.
The elastic member for an elastic member according to any one of claims 1 to 7, further comprising an electrolytic corrosion prevention portion that is formed using an insulating material and is provided between the core material and the reinforcing fiber. wire.
In the direction in which the reinforcing fiber is wound around at least the core of the reinforcing fiber on the outer surface along the direction of the tensile load applied to the elastic member wire according to the load applied from the outside. The elastic member wire according to any one of claims 1 to 8, wherein the wire is for elastic members.
The FRP layer includes a thermosetting resin that fixes the reinforcing fibers,
The elastic member according to any one of claims 1 to 9, wherein the second tube body is subjected to a surface treatment for improving adhesion to the thermosetting resin on an outer surface. Wire rod.
The wire for an elastic member according to any one of claims 1 to 10, wherein the reinforcing fiber is continuous along a circumferential direction with respect to the core material.
An elastic member comprising the wire for an elastic member according to any one of claims 1 to 11.
The elastic member according to claim 12, wherein the elastic member is a torsion bar, a stabilizer, or a frame for an automobile.