JP2000140939A - Induction guide of metallic wire and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to simultaneously satisfy both of wear resistance and impact resistance and to prevent the flawing of a metallic wire by forming the above induction guide to a cylindrical shape consisting of a carbon fiber woven fabric and thermally cracked carbonaceous material and reinforcing the carbon fiber woven fabric by circumferentially laminating the entire layer in the thickness direction of the cylindrical wall with the carbon fiber woven fabric. SOLUTION: The circumferentially laminated layers of the carbon fiber woven fabric consist of the two-layered structure circumferentially laminated with a carbon fiber filament woven fabric at the outer layer and circumferentially laminated with the carbon staple spun woven fabric at the inner layer. The carbon fiber woven fabric is preferably an acrylic based carbon fiber woven fabric. The induction guide of the metallic wire consisting of the carbon fiber woven fabric and the thermally cracked carbonaceous material is produced by successively circumferentially laminating the carbon fiber staple stable spun woven fabric and the carbon filament woven fabric on the outer periphery of a mandrel, then molding the matrix resin, subjecting the matrix resin to a baking treatment in an inert atmosphere to carbonize the matrix resin and removing the mandrel in a stage of either after the carbonization or before the carbonization.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide for guiding a metal wire such as a steel wire and a method for manufacturing the same. More specifically, the present invention relates to an induction guide for a metal wire mainly composed of carbon fiber and pyrolytic carbonaceous material and having excellent heat resistance, and a method for producing the same.

[0002]

2. Description of the Related Art A metal wire such as a steel wire is wound by a heating furnace, and a metal wire drawn at a high speed of 100 to 200 km / h by a rolling mill is guided to a winding mechanism by a cylindrical guide. It is wound up. Conventionally, ceramic materials or carbon materials have been widely used for the cylindrical guide. The ceramic material has little wear but easily damages the metal wire. The carbon material is a sintered carbon material obtained by molding and sintering graphite powder under high pressure with a binder such as coal tar pitch.It does not damage the metal wire, but is severely abraded. There is a problem that it is easily damaged.

In order to improve the impact resistance of such a carbon material, the outer periphery of the cylindrical carbon material is reinforced with carbon fibers and the matrix is made of carbon. A guide having a laminated structure with a / C material has also been proposed (Japanese Patent Laid-Open No. Hei 10-94821). Such a guide having a laminated structure of a sintered carbon material and a C / C material has a problem that it is easily peeled off at the interface between the sintered carbon material and the C / C material, and lacks durability.

As another configuration of a guide using a C / C material, there is a configuration in which a C / C plate material laminated and reinforced with a carbon fiber fabric is cut into a desired cylinder and cut.
Since the reinforcing layer is arranged in a direction perpendicular to the axis of the cylinder, if the reinforcing layer peels off, a disc-shaped peeling piece is generated, which is not preferable.

A C / C composite guide provided with a carbon fiber bundle by a filament winding method and provided with a carbon fiber reinforced layer is separated into an original carbon fiber bundle unit or a finer fiber bundle by collision with a metal wire. There was a disadvantage that the metal wire was easily entangled.

[0006]

SUMMARY OF THE INVENTION The present invention relates to
An object of the present invention is to provide a guide for guiding a metal wire which simultaneously satisfies both impact resistance and does not damage the metal wire.

The inventors of the present invention have conducted research to solve the above problems, and as a result, in a C / C composite capable of imparting appropriate abrasion to the extent that the metal wire is not damaged, particularly in a reinforcing material. The present invention has been completed by paying attention to a certain carbon fiber arrangement method.

[0008]

The present invention has the following construction. That is, the present invention provides a guide for a cylindrical metal wire, wherein the entire thickness of the cylindrical wall in the thickness direction is reinforced by laminating the carbon fiber fabric around the metal wire, the metal wire comprising a carbon fiber fabric and a pyrolytic carbonaceous material. And a method for manufacturing the same.

Such a guide is strong against mechanical impact, has high wear resistance, and does not damage metal wires.

[0010]

The present invention will be described below based on its configuration.

In the present invention, the carbon fiber fabric is a fiber obtained from an isotropic pitch selected from the group consisting of petroleum pitch, coal pitch, lignin pitch and aromatic synthetic pitch, polyacrylonitrile fiber, rayon fiber ,
It is a woven fabric of carbon fibers derived from phenol resin fibers in a conventional manner.

The form of the carbon fiber is a filament or staple fiber. Among the carbon fiber fabrics, the filament fabric is a fabric of carbon fiber filaments, and the staple fabric is a fabric of a carbon fiber spun yarn composed of staples of carbon fibers.

[0013] A spun carbon fiber yarn is obtained by forming staple fibers at any stage from raw material organic fibers to carbon fibers, spinning this into a spun yarn, weaving and carbonizing. For example, in the case of acrylic carbon fiber spun yarn which is a typical carbon fiber, acrylonitrile fiber which is a raw material organic fiber is subjected to a flame-proof treatment in an oxidizing atmosphere and then subjected to a cutting step to form a flame-resistant fiber spun yarn, and then inert. Obtained by carbonizing in an atmosphere. The production of such carbon fiber spun yarn is widely known. Both the filament fabric and the staple fabric are not particularly limited in the fabric structure, and plain weave, satin weave, twill weave, and the like can be employed. It is preferable to use a plain weave because of good handleability at the time of lamination.

In the present invention, pyrolytic carbonaceous materials include thermosetting resins such as phenolic resin, epoxy resin, polyimide resin, polyamide resin, polyether resin, bismaleimide resin, triazine resin, isotropic pitch, anisotropic pitch, and the like. Amorphous carbon and graphite mainly formed by heat treatment of organic compounds such as pitch in an inert atmosphere.

Such a molded product composed of carbon fiber and pyrolytic carbonaceous material is known as a carbon fiber reinforced carbon composite material (C / C composite).

In general, a C / C composite is prepared by impregnating a carbon fiber sheet or woven fabric with a thermosetting resin such as a phenol resin in advance and laminating the same, followed by thermosetting and carbonizing or graphitizing in an inert atmosphere. In order to further increase the density, carbonization, at the time of graphitization, the voids generated by the thermal decomposition of the thermosetting resin are again impregnated with resin or pitch, and carbonized again.
Repeating the densification treatment for graphitization multiple times, or molding by a so-called filament winding method of winding the core fiber while impregnating the carbon fiber bundle with the resin, and curing, carbonizing, densifying, graphitization treatment in the same manner as above It is known that it can be obtained by performing

In the present invention, the cylindrical structure of the guiding guide is such that substantially all of the cylindrical wall is formed of a C / C composite having a carbon fiber woven fabric as a reinforcing layer, and a sintered carbon material or the like is used. No inner wall layer. The reinforcing layers of carbon fiber fabric are arranged such that the fabric surface is circumferentially laminated along the axis of the cylinder.

It is preferable that at least the inner layer of the reinforcing layer made of a carbon fiber woven fabric laminated around the axis of the cylinder is a reinforcing layer of a carbon fiber spun yarn woven fabric. This is because, in the case of a filament woven fabric, the filaments constituting the woven fabric are unraveled due to the collision of the metal wire, and the filament wraps around the metal wire, thereby significantly reducing the work efficiency. Therefore, it is preferable that all the layers are reinforced layers of the carbon fiber spun yarn woven fabric or that the carbon fiber filament woven fabric reinforced layer is disposed on the outer periphery of the carbon fiber spun yarn woven fabric reinforced layer. The matrix made of pyrolytic carbonaceous material may be amorphous or graphite, and may contain a small amount of a different element such as silicon or boron to increase oxidation resistance.

The higher the density, the more preferable because the amount of wear of the guide can be reduced. However, the densification process must be repeated many times, and it takes a very long time to manufacture the guide. 1.0 to 1.8
g / cm ³ is good. Preferably 1.2 to 1.6 g / cm ³
Is good

[Manufacturing method] The carbon fiber fabric manufactured by various methods is wound around a core material together with a thermosetting resin. At this time, a C / C composite guide obtained by repeating a heat treatment and a densification after forming a cylindrical body formed by laminating a carbon fiber spun yarn wrap around at least the innermost layer portion is provided.

The carbon fiber woven fabric is wound around a mandrel serving as a core material at the time of molding a cylindrical body, and is impregnated with a thermosetting resin prior to the winding. The method of impregnation is not particularly limited, and any method may be employed as long as the thermosetting resin can uniformly impregnate the carbon fiber fabric.

The thermosetting resin used in the present invention is the above-mentioned phenol resin, epoxy resin, bismaleimide resin, triazine resin and the like. When applied to the present invention, these resins may be used alone or in combination of two or more kinds. In order to improve the slidability, a carbonaceous powder such as graphite, a ceramic powder such as boron nitride and the like are further kneaded. You may use it. The particle size of these powders is not particularly limited, but is preferably 300 μm or less, more preferably 100 μm or less, in order to uniformly disperse the fibers between the fibers of the carbon fiber fabric.

It is preferable that the material of the mandrel is substantially hard and has a small coefficient of thermal expansion, and a material substantially free from thermal deformation is used. Specifically, carbonaceous material, graphite, ceramics, or the like can be used. Further, when the mandrel is not used at a high temperature, for example, after removing the mandrel after the step of curing the resin, a metal such as stainless steel may be used.

After laminating the carbon fiber woven fabric around, it is necessary to cure the thermosetting resin. The curing conditions are not particularly limited, but when a thermosetting resin dissolved in a solvent is used, it is preferable to volatilize in advance at a temperature near the boiling point of the solvent in order to remove distortion due to molding. When a catalyst is used to accelerate the curing of the resin, it is preferable to cure at a low temperature. As a carbon fiber woven fabric, the strength of the guide can be further increased by laminating an array sheet or woven fabric using carbon fiber filaments around the outside of the carbon fiber spun yarn woven fabric. In particular, a filament woven fabric is preferred because of its good handleability.

It is desirable that the molded article (preform) after curing is further heat-treated at a high temperature. By this operation,
It is possible to reduce the occurrence of distortion in the subsequent firing step. This heat treatment temperature must be lower than the decomposition point or the combustion start temperature of the resin used, and generally varies depending on the type, molecular weight and composition of the resin, but is generally 400 ° C. or lower. Further, this heat treatment is preferably performed for a long time, but it is substantially 1 hour to 100 hours in consideration of productivity.

After the heat treatment of the preform, the bulk density can be increased by further impregnating the molded body with a resin, pitch or the like. This impregnation may be performed by any method as long as it can be performed uniformly on the molded body. The resin or pitch may be heated or dissolved in a solvent to lower the viscosity and decompressed under reduced pressure. It can also be performed by repeating foaming and pressurization.

The firing is performed by heating in an inert gas such as nitrogen or argon. At this time, the heating rate is not particularly limited, but by preventing deformation of the preform due to decomposition of organic matter with a molded body such as graphite or ceramics, the heating rate can be significantly increased. The bulk density can be increased (densified) by repeatedly impregnating and firing the molded body after firing with a resin, pitch, or the like.
Densification improves the strength, oxidation resistance, and abrasion resistance of the guide, thereby extending the service life and reducing the number of replacements of the guide when the guide is used.

Further, during the firing, the graphite crystal develops by being treated at a temperature of 1500 ° C. or higher, so that the thermal conductivity increases and the heat of the metal wire can be efficiently released to the outside. In addition, by increasing the degree of graphitization in carbon fiber,
The slidability of the guide is improved.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1A is a front view of a guide according to an embodiment of the present invention, and FIG. 1B is a sectional side view thereof. In FIG. 1, reference numeral 1 denotes a surrounding layer of a carbon fiber spun yarn woven fabric, and reference numeral 2 denotes a surrounding layer of a carbon fiber filament woven fabric.

[0031]

The present invention will be described in more detail with reference to the following Examples, but it should not be construed that the present invention is limited thereto. (Example 1) Polyacrylonitrile-based flame-resistant fiber spun yarn fabric (manufactured by Toho Rayon Co., Ltd., trade name Pyromex)
W0221) is carbonized in an electric furnace filled with a nitrogen gas, and a polyacrylonitrile-based carbon fiber spun yarn fabric (hereinafter referred to as CF-SYC (Carbon Fiber-Spun Yarn Cloth)).
). After impregnating CF-SYC with a bismaleimide-triazine resin (trade name: BT resin BT3005N, manufactured by Mitsubishi Gas Chemical Co., Ltd.) so as to have a resin content (RC) of 75%, a length of 15 mm in a stainless steel mandrel is obtained. The woven fabric cut into a length of 100 cm was rolled up to form a layer having a thickness of about 10 mm. The preform was gradually heated to 250 ° C. in a curing furnace and cured.

The obtained FRP cylinder was cut into a length of 35 mm, packed in an electric furnace, and carbonized at 1000 ° C. under a nitrogen atmosphere. The obtained C / C composite was set to an inner diameter of 16 mm,
Cutting was performed to an outer diameter of 33 mm and a length of 30 mm to obtain a metal wire guide. The metal wire guide thus obtained had a small amount of wear, and was excellent in impact resistance and sliding characteristics.

Example 2 C obtained in the same manner as in Example 1
A phenolic resin (Sumilite Resin, manufactured by Sumitomo Durez Co., Ltd.) is used in F-SYC so that RC = 75%.
PR9480), and a metal wire guide was obtained in the same manner as in Example 1.

Example 3 A phenol resin equivalent to RC = 55% and a graphite powder equivalent to 20% in content (same as in Example 1 except that CF-SYC was mixed and impregnated with Kanto Chemical Co., Ltd.) After the treatment, a metal wire guide was obtained, which was particularly excellent in sliding characteristics.

Example 4 C obtained in the same manner as in Example 1
F-SYC is provided with a phenol resin equivalent to RC = 55% (shown polymer BRL-24, trade name, manufactured by Showa Polymer Co., Ltd.).
0) and graphite powder equivalent to 20% content (Kanto Chemical Co., Ltd.)
Phenolic resin) and 5% equivalent of a hardening agent (shown polymer FRH, Showa Polymer Co., Ltd.)
-30) was impregnated immediately after mixing, cut into a length of 55 cm, wound around a stainless steel mandrel having a diameter of 21.5 mm, and further compressed to 32 mm in diameter using a tape. The compressed preform was heat-treated at 50 ° C. for 2 hours to cure the preform, thereby obtaining a cylindrical molded body. Furthermore, RC = 55% for carbon fiber filament fabric (trade name Vesfight W3101, manufactured by Toho Rayon Co., Ltd.)
A 20 cm long woven fabric pre-impregnated with considerable BRL-240 was wrapped around and heated stepwise to 250 ° C. in a curing oven to obtain a cylindrical FRP. After the core removal, a graphite mandrel having a diameter of 21.5 mm was passed through a cylindrical FRP cut to a length of 30.5 mm, and heat-treated at 1000 ° C. in an electric furnace under a nitrogen atmosphere. In addition, coal tar pitch (Sumito Kasei Co., Ltd.)
) Was carbonized and impregnated twice, and then heat-treated at 2,000 ° C in a nitrogen atmosphere in an induction heating furnace to form a metal wire guide having an inner diameter of 22 mm, an outer diameter of 33 mm, and a length of 30 mm. I got

The metal wire guide thus obtained has a small amount of abrasion and is particularly excellent in impact resistance and sliding characteristics, similarly to the guide obtained in Example 1, and is suitable for guiding a metal wire. Was suitable.

Comparative Example 1 C obtained in the same manner as in Example 1
A phenolic resin (Sumitomo Durez Co., Ltd., trade name Sumilite Resin) is added to F-SYC so that RC = 40%.
PR9480) was impregnated, and a plate-like FRP having a thickness of 31 mm obtained by press molding was subjected to the same heat treatment as in Example 1 and machined to obtain an inner diameter of 16 mm and an outer diameter of 33 m.
m, a metal wire guide having a height of 30 mm was obtained. During use, peeling occurred between some of the guide laminations, and a failure occurred in which the metal wires collided.

(Comparative Example 2) Polyacrylonitrile-based carbon fiber (trade name Vesfight H, manufactured by Toho Rayon Co., Ltd.)
TA-12KE30) is impregnated with a bismaleimide / triazine-based resin (BT resin BT3005N, trade name of Mitsubishi Gas Chemical Co., Ltd.) so that RC = 33%. After winding to an outer diameter of 33 mm, the same treatment as in Example 1 was performed to obtain a metal wire guide having an inner diameter of 16 mm, an outer diameter of 33 mm, and a height of 30 mm. In use, the ends of the strands burst during use, and some of the fibers became entangled with metal wires.

[0039]

The guide of the present invention has a small amount of wear and is resistant to impact. The guide according to the fifth aspect is particularly excellent in sliding characteristics among the guides according to the first to fourth aspects, and does not damage the metal wire.

[0040]

[Brief description of the drawings]

1A is a front view of a guide according to an embodiment of the present invention, and FIG. 1B is a sectional side view thereof.

[Explanation of symbols]

 1: Carbon fiber spun yarn fabric and pyrolytic carbonaceous layer 2: Carbon fiber filament fabric and pyrolytic carbonaceous layer

Claims (7)

[Claims] In a guide for guiding a cylindrical metal wire, a metal wire made of a carbon fiber woven fabric and a pyrolytic carbonaceous material, wherein all layers in the thickness direction of the cylindrical wall are reinforced by laminating a carbon fiber woven fabric around the wire. Guidance guide. 2. The guide for guiding a metal wire according to claim 1, wherein the circular lamination of the carbon fiber fabric is a two-layer combination of a carbon fiber filament fabric and a carbon fiber staple spun yarn fabric. 3. The circular lamination of the carbon fiber woven fabric has a two-layer structure in which a carbon fiber filament woven fabric is circularly laminated on an outer layer and a carbon fiber staple spun yarn woven fabric is circularly laminated on an inner layer.
The guide for guiding a metal wire according to claim 1. 4. The guide according to claim 1, wherein the carbon fiber fabric is an acrylic carbon fiber fabric. 5. The guide according to claim 1, wherein the density is 1.0 to 1.8 g / cm ³ . 6. A mandrel is formed by sequentially laminating a carbon fiber staple spun yarn woven fabric impregnated with a matrix resin and a carbon fiber filament woven fabric around a mandrel, followed by molding.
A carbon fiber fabric and a metal wire made of pyrolytic carbonaceous material, characterized in that the matrix resin is carbonized by baking in an inert atmosphere and the mandrel is removed at any stage after or before carbonization. Manufacturing method of guidance guide. 7. The method according to claim 6, wherein a densification treatment is performed after the matrix resin is carbonized.