JPH02242987A - Strand for twisted yarn of fiber composite material, twisted yarn and production thereof - Google Patents

Abstract

PURPOSE:To provide the subject strand having high flexibility, high strength and light weight by integrally curing high strength non-plastic fiber bundle impregnated with a thermoplastic resin to a spiral state having a constant pitch. CONSTITUTION:A high strength non-plastic fiber bundle comprising high strength non-plastic fibers such as carbon fibers having tensile strengths of >=100kg/mm<2> is dipped in a thermosetting resin such as an epoxy resin, squeezed to remove the excess resin of the fiber bundle, formed into a spiral shape having a constant pitch and subsequently cured to provide the objective strand. A plurality of the strands are twisted and wound on a flexible linear core material having a lower elastic modulus than that of the strand along the spiral of the strand to provide a twisted strand having a high breaking strength. For example, aramide fibers are preferably used as core fibers when carbon fibers are employed in the strand material, and glass fibers are preferably used as the core material for a strand comprising the aramide fibers.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stranded wire as a tension member, and more specifically, to a stranded wire suitable for structural materials that require high strength, lightness, and flexibility. The present invention relates to strands constituting the stranded wires and methods of manufacturing them.

[Conventional technology]

Conventionally, lobes or stranded wires formed by twisting a plurality of wires together have been widely used. In this twisted wire, the individual wires are wrapped around each other while maintaining an independent state, thereby exhibiting flexibility and joint strength.

The materials that make up the strands of stranded wires are usually wires, natural fibers, and synthetic fibers, but recently, high-strength non-plastic materials such as glass fiber and carbon fiber have been used to achieve high strength and light weight. It has been proposed to use fibers. To manufacture stranded wire using such high-strength non-plastic fibers, the high-strength non-plastic fiber bundles are impregnated with uncured thermosetting resin, which is drawn with a die to remove excess thermosetting resin. It is conceivable to remove the strands and give the strands a desired cross-sectional shape, then harden them to form a straight strand, and then twist the strands together in a plurality of strands. however.

A product made by simply twisting multiple straight wires after hardening.

The strands may twist and cause shear failure when being touched. 2!
, the strands unravel and do not form a stranded shape after all.

Therefore, it is conceivable to twist the thermosetting resin impregnated into the strands once while it is still plastic and fluid, that is, in an uncured state, and then harden it. The curable resin flows and sticks, causing fusion between the strands, and the independence of the plurality of strands constituting the 9128 wire cannot be maintained.

In order to solve this problem, a high-strength non-plastic fiber bundle impregnated with uncured thermosetting resin is drawn with a die, given the desired cross-sectional shape, and then its outer periphery is coated with thermoplastic resin. A method of manufacturing stranded wire by adding a plurality of wires and then heating the whole to harden the thermosetting resin (for example,
(See Japanese Patent Publication No. 57-25679).

Alternatively, a high-strength non-plastic fiber bundle impregnated with an uncured thermosetting resin is pulled out with a die, given the desired cross-sectional shape, and then a dry powder agent is sprinkled on its outer periphery, and then the fibers are braided on top. After covering the body with the body and adding several bottles of it, the entire body is heated to harden the thermosetting resin.

Method of shaping stranded wire (for example, Japanese Patent Publication No. 62-1867)
(see Publication No. 9) has been proposed.

[Problem to be solved by the invention]

However, these methods involve more steps than directly adding the strands, and the cross-sectional area of the stranded wire increases by the volume of the coating material, resulting in a reduction in the strength of the stranded wire per cross-sectional area. was there. Furthermore, when impregnated with a resin system whose viscosity significantly decreases during curing heating.

There was also the problem that the resin infiltrated to the outside of the coating material, causing fusion between the strands.

(Means for Solving the Problem!) The present inventor conducted research to solve the above-mentioned problems, and impregnated high-strength non-plastic fibers such as carbon fibers with a thermosetting resin. A strand is made by heat-curing it into a spiral wire shape with a constant pitch, and if multiple strands are routed along the pinch, each strand becomes independent. The present invention was completed by discovering that it is possible to obtain fiber composite strands with high flexibility.

That is, the present invention provides a fiber composite stranded wire characterized in that it is formed by integrally curing high-strength non-plastic fiber bundles impregnated with a thermosetting resin into a spiral wire shape with a partial pitch.

and its manufacturing method.

In addition, in the present invention, a plurality of strands formed by integrally curing high-strength non-plastic fiber bundles impregnated with a thermosetting resin into a spiral wire shape with a partial pitch are twisted together along the spiral. A fiber composite strand characterized by a stranded wire and a high-strength non-plastic fiber bundle are impregnated with a thermosetting resin and integrally cured into a spiral wire with a constant pitch to form a wire.

This is a method for manufacturing a fiber composite stranded wire, characterized in that a stranded wire is formed by splicing a plurality of these strands along a spiral.

Hereinafter, one aspect of the present invention will be explained in detail.

The high-strength non-plastic fibers used in the strands of the present invention and the stranded wires made of the strands have a tensile strength of lookkg/II.
I'' or more, and the amount of plastic deformation up to tensile breakage is equal to or less than the amount of elastic deformation 2. For example, carbon fiber 5 refers to polyaramid fiber, glass fiber, silicon carbide fiber, etc.
The high-strength non-plastic fiber bundle that constitutes the wire is a bundle of these high-strength non-plastic fibers, and specifically, multiple tows, strands, yarns, etc. of these high-strength non-plastic fibers are tied together in parallel. It is aligned and focused. In addition.

At this time, if necessary, a bundle of strands, yarns, etc. may be appropriately twisted or braided.

As the thermosetting resin, those commonly used as matrices of fiber composite materials, such as epoxy resins, unsaturated polyester resins, polyimide resins, and vinyl ester resins, can be used.

The spiral wire shape with a constant pitch given to the strands is a shape that matches the shape occupied by each strand within the strand when multiple strands are spliced together to make a stranded wire. usually.

The pinch of the helix is preferably 20 times or more the diameter of the strand.

The helical wire is the high-strength non-plastic fiber bundle mentioned above.

-Similar to the standard FRP pultrusion molding method, after immersing in a thermosetting resin solution, excess resin is squeezed out, and then.

The resin-impregnated fiber bundle is shaped into a spiral line shape with a partial pitch, and then heated and cured to form the fiber bundle.

As a method for shaping and molding a resin-impregnated fiber bundle into a spiral line, a rotating die having spiral die holes at a constant pitch around the axis of one rotation is prepared, and the die holes of the rotating die are impregnated with resin. By heating the rotating die through the fiber bundle, the resin-impregnated fiber bundle being encountered inside is heated to cure the thermosetting resin, and at the same time.

The resin impregnation is carried out while rotating the rotary die around the rotary axis at a circumferential speed that is relatively equal to the circumferential direction component of the spiral forming speed of the molded product that is pulled out from the rotary die to form a spiral line shape. There is a method of pulling the fiber bundle from a rotating die. With this method, the fiber bundle can be formed into a spiral shape while running continuously, so it is highly productive and can be used as an alternative method.

A mandrel having spiral molding grooves at a constant pitch on the outer periphery is prepared, and the mandrel is heated.A resin-impregnated fiber bundle is wound around the molding grooves of the mandrel, and the resin is heated and cured. There is a method of repeating the process of removing the cured part from the mandrel, placing the last end of the cured part at the beginning of the mandrel, wrapping the following uncured part around the molding groove of the mandrel, and curing the resin.

The stranded wire of the present invention is formed by twisting together a plurality of wires formed into a spiral shape with a constant pitch as described above. When the wires are relatively short (for example, 10 m or less), one end of each of the wires is bundled and tied, and this is used as a fixed end.

There is a method of kissing each strand from the fixed end so as to follow the spiral of each strand. When the strands are long, each strand is wound onto a reel, and the plurality of reels are arranged around a central axis passing through the bottom position of the strand.

Pulling out the strands from each reel and aligning them at the bottom position of the strand, and causing the plurality of reels to revolve around the central axis in a state in which each reel does not rotate around its own axis in the direction in which the strands are unwound. Accordingly, a plurality of wires can be spliced together without further twisting each wire.

In the stranded wire of the present invention constructed in this way, since the strands themselves are in the form of a spiral wire, a large twisting force, 1 bending force, etc. is not applied to the strands when the wires are twisted twice.

No torsional shear failure occurs, and the strands are well bonded without causing any damage. Furthermore, since each strand remains independent, it is possible to exhibit excellent flexibility and joint strength.

The stranded wire of the present invention may be constructed by twisting only the spiral strands described above, but it may be constructed by using a linear core material,
The core material may be constructed by splicing a plurality of the spiral strands around the core material.The core material may be made of the same material as the strands, but has a higher elasticity than the strand material. If a highly flexible material is used, the structure of the stranded wire will become close to solid and the breaking strength will be high, so it is preferable.0 As the core material used in the present invention, aramid fiber , glass fiber is preferable for aramid fiber strands, and organic synthetic fibers such as polyester are preferable for glass fiber strands, and fiber composites made of the same material as the two strands are preferably used for one twist angle. It is also preferable to use a core material that is reversely twisted at a larger angle.

The cross-sectional shape of the strands constituting the stranded wire of the present invention is not particularly limited and may be circular; It is preferable that the strands have a cross-sectional shape in which at least part of the boundary between the strands forms a straight line so that the strands come into contact with each other.When using strands having such a cross-sectional shape, 12! The apparent cross-sectional area of the i#ll wire, that is, the circumscribed circle of the stranded wire structure, can be reduced, and the apparent strength per cross-sectional area can be increased.

In addition, the high-strength non-plastic fibers that make up the strands generally have lower strength in the lateral direction than in the longitudinal direction, so if there are many spaces in the cross section of a stranded wire made of these strands, When compressed, such as when installing end fasteners.

However, if the strands are arranged in a straight line, that is, in surface contact, as described above, the space within the strands is reduced and the crushing strength is improved.

〔Example〕

The present invention will be described in detail below with reference to one drawing.

FIG. 1 shows an apparatus for continuously producing spiral wires of high-strength non-plastic fiber bundles. In the same figure.

l is a spool wound with high-strength non-plastic fiber, 2 is a high-strength non-plastic fiber tow drawn from the spool 0
In this embodiment, a high-strength type carbon fiber tow of 800 tex is used as the high-strength non-plastic fiber tow.

Further, the number of tows 2 (the number of spools I) is 16.

3 is a warping reel 4 for aligning a plurality of fiber tows 2, a focusing roller 5 is for collecting a plurality of fiber tows 2, a fiber bundle formed by focusing a plurality of fiber tows 2, and 6 is a fiber bundle. This is a resin bath for impregnating the bundle 5 with uncured thermosetting resin. This resin tank 6 contains two epoxy resins as a thermosetting resin liquid 7 in this embodiment.

A squeeze die 8 is provided with a squeeze hole 8A through which the resin-impregnated fiber bundle 5 passes, and is used to squeeze out excess resin from the resin-impregnated fiber bundle 5 passing through the squeeze hole 8A. This squeeze die 8 has a fiber bundle 5 that passes through it once.
A heating means (
(not shown) is provided.

9 is a rotating die provided with a spiral die hole for forming the fiber bundle 5 into a spiral line shape. This rotary die 9 is held by a bearing 1o so as to be rotatable about one rotation axis X-X as shown in FIGS. 2 to 4, and further has a gear 11 at one end. . A drive device 13 (see FIG. 1) is connected to this gear 11 via a gear 12. The zero-rotation die 9 has a spiral die hole with a partial pitch centered on its rotation axis XX. It is equipped with 14. The die hole 14 does not need to have a length of one pinch of the spiral, and may only have a length of about 1/4; in this embodiment, it is set to 1/4 of the pitch of the spiral (specifically, 75 cranes). The cross section of the die hole 14 is simply circular in this embodiment, which is the cross-sectional shape required for the wire to be finally formed. Such a spiral die hole 14 is a split mold 9A obtained by dividing the one-rotation die 9 into two along a diameter line connecting the rotation axis and the die hole.

9B (see FIG. 4), a high frequency coil 15 is provided on the outer periphery of the zero-turn die 9 that can be formed, so that the one-turn die 9 can be heated by high frequency induction.

In FIG. 1, 16 is a wire formed into a spiral shape by a rotating die 9, 17 is a belt-type puller for pulling out the wire 16 from the rotating die 9, and 18 is a wire for winding the wire 16. It is a line spool. The blur 17 is driven by a drive 1113 so as to interlock with the one-rotation die 9. Here, the rotational speed of the one-rotation die 9 is the circumferential component V of the helical forming speed of the molded product (strand 16) drawn from the one-rotation die 9 (i.e.,
The circumferential velocity of the strand 16 at the exit of the rotating die when the strand 16 shown by the solid line is pulled out in the XX direction at a speed V while being inclined with respect to the rotational axis XX) Selected. As a result, one rotation die 9
The helical wire-shaped element &116 molded in can be pulled out from the nine-turn die 9 while remaining in the spiral wire shape, as shown by the two-dot chain line.

Next, the operation of forming a helical wire by the above-described apparatus will be explained.

In FIG. 1, a plurality of fiber bundles 2 pulled out from a spool 1 are drawn together by a warping reed 3, and then collected by a focusing roller 4 to form a fiber bundle 5. Next, the fiber bundle 5 is immersed in a resin bath 6, impregnated with resin, and then passed through a squeeze die 8 to remove excess resin.

At this time, the squeeze die 8 is heated to 80 to 120[deg.] C. and heats the fiber bundle 5 passing through it twice to semi-cure the impregnated resin. Thereafter, the fiber bundle 5 is passed through the spiral die hole 14 of the rotating die 9 and pulled out by a heald type puller 17. At that time, the fiber bundle 5 is heated by a rotating die 9 heated to 120 to 180°C by a high frequency coil 15, and the impregnated resin is heated and hardened.
The 11i fiber bundle 5 is integrally hardened into a spiral shape. The fiber bundle drawn out from the one-rotation die 9 thus becomes a strand 16 formed into a spiral wire shape. These steps are performed by puller 1
7 is carried out by continuously drawing out the strand 16 at a speed of 1-10 m/min, and the formed strand 16 is wound onto a strand spool 18 through zero or more steps to form a spiral strand. A wire 16 is manufactured.

This strand 16 is used for manufacturing stranded wire as shown below.

Next, a method for manufacturing a 128-strand wire will be explained. The wire 16 manufactured by the above process is cut into a suitable length (for example, 10 m).
) Prepare 6 pieces cut into 6 pieces, and align the tips of each.

After binding with a string or the like, twisting 120 shown in FIG. 6 is obtained by rotating each strand relative to the binding tip. In addition, in Fig. 6, in order to make it easier to understand,
One elementary m16 is shown with hunting attached. Here, the strands 16 constituting the stranded wire 20 are 128 strands 20
Even before it is twisted, it is shaped so that it has the same shape as the shape occupied by each strand 16 within the twisted %I20. As a result, when forming a stranded wire 20 by repeatedly reading a plurality of strands 16, the strands 20 in which each strand 16 is mutually twisted can be formed without substantially plastically deforming the strands 16 themselves.
In the stranded wire 20 formed by this process, which can form 0 and does not untwist, each strand is not damaged.

Since each strand is independent, it is possible to exhibit excellent flexibility and strength of the gold wire.

In addition, when configuring the marrow gland, for example, the core material 1 is placed in the center.

By arranging a unidirectional pultrusion molded rod of aramid fiber and making a spiral wire 16 circulate around it,
As shown in FIG. 7, there is no material around the core material 21! A strand 21 with 16 strands can be obtained.

The wire twisting process using the strands 16 is not limited to the above method.

It is also possible to carry out the process using an ordinary seed-forming machine.

FIG. 8 schematically shows a wire stranding process using a seed type net making machine. This net making machine includes a core material feeding spool 23 that feeds out a core material 22, an autorotating cage 24 that rotates around a strand axis (a central axis passing through the bottom position of the strand line), and a rotating cage 24 that rotates at a position away from the strand axis. A plurality of revolution cages 25 are attached to the cage 24 and hold the strand spool 18 horizontally, a drive device rotates the rotation cage 24, and when the rotation cage 24 rotates.

A planetary gear mechanism (not shown) rotates the revolving cage 25 with respect to the rotating cage 24 so as to keep it horizontal, and a twisting mechanism rotates and connects the wire 16 drawn out from the wire spool 18 attached to the revolving cage 25. It includes a guide device 26 disposed at the linear bottom position, a drive wheel 27 for drawing out the stranded wire at a predetermined speed, a stranded wire take-up spool 28, and the like.

In this device, the rotation cage 24 rotates in the twisting direction around the twisting axis, so that a plurality of revolution cages 2
5 and the strand spool 18 held therein rotate around the stranded wire axis, and rotate the spiral strands around the core wire 22. At this time, each strand spool 18 is kept horizontal even when the rotation cage 24 rotates, and does not rotate around the direction in which each strand is unwound, so that no further twist is applied to each strand. By synchronizing the ratio of the revolution speed of the strand spool 18 to the strand driving speed by the driving wheel 27 with the helical pitch of the strands, each strand 16 is prevented from undergoing plastic deformation (and is prevented from being plastically deformed along its helical line shape). It is possible to obtain a good twisted wire.

In the above example, the rotating die 9 equipped with a spiral die hole was used to harden the resin-impregnated fiber bundle into a spiral wire shape. A mandrel with molded grooves can also be used. An example of such a mandrel is shown in FIG.

The mandrel 30 shown in FIG. 9 has a length of 2 twist pitches.
, 5 times (4QOm in this example), and a spiral molding groove 31 is formed on its outer periphery. In addition, this forming groove 31
As shown in Figure 10, the cross section has a shape with sides consisting of straight lines ab and c, and the 3rd and 0th sides are 4 mm,
Side b is 2 mm, and side a is 120°. An electric heater is inserted into the central axis of the mandrel 30, and the mandrel 30 is heated to 120 to 180 degrees.

The molding process using the mandrel 30 shown in FIG. 9 is performed as follows. The resin-containing fiber bundle, which has been preheated and semi-hardened using the squeeze die 8 in FIG. Wrap it around the
Hold for 15 seconds. As a result, the resin contained in the fiber bundle hardens, and then it is removed from the mandrel using its elasticity.
Next, the fiber bundle following the hardened portion is placed in the puller 1.
At 7, pull from squeeze die 8.

It is again wound around the forming groove 31 of the mandrel 30 and hardened. By repeating the same operation intermittently.

It is possible to obtain a strand that is integrally cured into a spiral wire.

As shown in FIG. 11, the wire 33 formed using the forming groove 31 has straight portions 33a, 33b, 33c in the cross section.
have.

When six of these strands 33 are used, and a core material 22 with a hexagonal cross-section made by a normal pultrusion method is inserted in the center and the wires are spliced, a stranded wire 34 whose cross section is shown in FIG. 12 is obtained. It will be done. In this stranded wire 34, each strand 33 and the core material 22 are in linear contact and are in surface contact), and each cotton 33
They also touch in a straight line. For this reason.

The stranded wire 34 has higher solidity than the stranded wire 21 shown in FIG. 7, and has improved breaking strength and crushing strength.

〔Effect of the invention〕

As described above, the fiber composite stranded wire of the present invention is made by integrally curing high-strength non-plastic fiber bundles impregnated with a thermosetting resin into a spiral wire shape with a constant pitch. A stranded wire can be formed by simply splicing a plurality of strands together along a spiral.

In addition, the stranded wire of the present invention made from the strands uses high-strength non-plastic fiber bundles, but the strands are not damaged during twisting, and the individual strands do not overlap with each other. Since it is independent without being bonded, it is highly flexible, strong, and lightweight. Furthermore, since the strands are not covered with a thermoplastic resin film or an &I assembly, the cross section of the 128-strand wire can be made smaller.

In addition, in the stranded wire manufacturing method of the present invention, a high-strength non-plastic fiber bundle is impregnated with a thermosetting resin, and this is integrally cured into a helical wire shape with a constant pinch to form a strand, and a plurality of strands of this strand are This method is characterized by forming strands by splicing along a spiral, so unlike conventional methods, a high-strength non-plastic fiber bundle impregnated with a thermosetting resin is mixed with a thermoplastic resin or This method has the effect that the manufacturing process of the stranded wire is simpler than the method of covering with a braided body or the like.

In addition, when making a stranded wire using the strands of the present invention, by circulating a plurality of strands around a flexible core material whose elastic elongation is greater than that of the strands, the strands are close to solid and have high breaking strength. You can get the line.

In addition, by configuring the strands so that the strands are in surface contact with other strands or the core material, the compressive strength can be improved.

[Brief explanation of drawings]

FIG. 1 is an overall schematic diagram of an apparatus for manufacturing strands according to an embodiment of the present invention, FIG. 2 is a schematic cross-sectional view of a rotating die used in the apparatus, and FIG. 3 is a partial cross-sectional view of the rotating die. figure,
Fig. 4 is a schematic perspective view showing a split mold that constitutes the rotating die, Fig. 5 is a schematic plan view illustrating the relationship between the rotational speed of the rotating die and the drawing speed of the strand, and Fig. 6 is a helical wire shape. 7 is a cross-sectional view showing another example of the stranded wire, FIG. 8 is a schematic perspective view of a cage-type net making machine, and FIG. 9 is a spiral wire-like wire. A schematic perspective view of a mandrel used for forming a wire, Fig. 1θ is a schematic sectional view of a forming groove formed in the mandrel, Fig. 11 is a schematic sectional view of a strand formed using the mandrel, Fig. 12 The figure shows the first
FIG. 2 is a schematic cross-sectional view of a stranded wire made using the strands of FIG. 1. 1-Spool, 2-High-strength non-plastic fiber tow, 3-Warping reed, 4-Focusing roller, 5-Fiber bundle, 6-Resin bath. 7-thermosetting resin liquid, 8--squeeze die, 9--one rotation die, 13--driving device, 14--spiral die hole 16--strand wire, 17--blurr, 18--strand wire spool, 20.21--Twisted wire, 22-Core material, 24--Rotation cage. Revolution cage guide member drive car take-up spool. mandrel. Molded groove wire. 1 straight line. Agent Patent Attorney Kyozo Nori Matsu

Claims (8)

[Claims] (1) A fiber composite stranded wire characterized in that it is made by integrally curing high-strength non-plastic fiber bundles impregnated with a thermosetting resin into a spiral wire with a constant pitch. (2) A plurality of strands formed by integrally curing high-strength non-plastic fiber bundles impregnated with a thermosetting resin in the form of a spiral line at a constant pitch are twisted together along the spiral line. Features stranded fiber composite wire. (3) A plurality of strands formed by integrally curing high-strength non-plastic fiber bundles impregnated with a thermosetting resin into a spiral wire shape with a constant pitch are twisted together along the spiral, and are adjacent to each other. A stranded fiber composite wire having a cross-sectional shape in which at least a portion of the boundary between the strands forms a straight line. (4) A flexible core material consisting of multiple strands made by integrally curing high-strength non-plastic fiber bundles impregnated with a thermosetting resin into a spiral line shape with a constant pitch, and having a lower elastic modulus than the strands. around the
A stranded fiber composite wire characterized in that the strands are twisted and twisted along a spiral of the strands. (5) A rotating die having a spiral die hole with a constant pitch centered on the rotation axis is prepared, and a high-strength non-plastic fiber bundle impregnated with a thermosetting resin is passed through the die hole of the rotating die. The high-strength non-plastic fiber bundle passing through the rotating die is heated to cure the thermosetting resin, and at the same time, the rotating die is heated relative to the circumferential component of the helical formation rate of the pultruded product from the rotating die. The fiber is characterized in that the high-strength non-plastic fiber bundle is formed into a spiral line by pulling the high-strength non-plastic fiber bundle from a rotating die while rotating around the rotational axis at a peripheral speed equal to A method for producing strands for composite stranded wire. (6) Prepare a mandrel with spiral molding grooves at a constant pitch around the outer periphery, heat the mandrel, and wrap a high-strength non-plastic fiber bundle impregnated with thermosetting resin around the molding grooves of the mandrel. A method for manufacturing a fiber composite stranded wire, comprising forming the high-strength non-plastic fiber bundle into a spiral wire by heating and curing it on a mandrel. (7) A high-strength non-plastic fiber bundle is impregnated with a thermosetting resin, and this is integrally cured into a spiral wire with a constant pitch to form a strand, and multiple strands of this strand are twisted together along the spiral. 1. A method for producing a fiber composite strand, comprising forming a strand by. (8) A high-strength non-plastic fiber bundle is impregnated with a thermosetting resin, and this is integrally cured into a spiral wire shape with a constant pitch to form a strand. A method for manufacturing a fiber composite strand, characterized in that a strand is formed around a low flexibility core material by twisting the strands along a spiral of the strands.