JPH07276538A - Roll made of carbon-fiber-reinforced plastic and its manufacture - Google Patents

Abstract

PURPOSE:To provide a manufacture of an easily platable pipe body as to a metal coated roll made of a carbon-fiber-reinforced plastic. CONSTITUTION:This roll is constituted of a pipe body layer made of a carbon- fiber-reinforced plastic 1 which is comprised by being wound up in the circumferential direction by a filament winding method and a metallic plated layer 2 circumscribing the pipe body layer. The pipe body made of the carbon fiber reinforced plastic 1 wherein a carbon fiber of a surface layer of a pipe body is comprised by being wound up in the circumferential direction by the filament winding method is molded and the outer surface of the pipe body is coated with the metal by an electric plating method. Hereby, since the carbon fiber of the outermost layer is wound up in the circumferential direction, it becomes possible that the electric plating is performed directly upon the same.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a metal-coated roll made of fiber reinforced plastic.

[0002]

2. Description of the Related Art Conventionally, iron rolls have been used as rolls used in printing machines, rolling machines, paper-making machines, film-making machines, etc., and when low inertia and lightweight are required, they are made of aluminum. Roll is used.

Recently, CFRP rolls made of carbon fiber reinforced plastic (CFRP) having excellent specific strength and specific rigidity have been provided in order to further reduce the rotational inertia, the flexure, and the weight.

CFRP rolls are often manufactured by a method called filament winding (FW) method.

The FW method is manufactured by winding carbon fiber strands around a core metal (mandrel) while impregnating a liquid thermosetting resin, then heat-curing the resin and removing the core metal (core removal). To be done.

From the viewpoint of improving surface hardness and smoothness, CFRP rolls are often coated with metal such as industrial chrome plating.

The metal coating is often performed by an electroplating method. For example, in the case of industrial chrome plating,
Copper plating, nickel plating, or both are often used as the base plating.

As a method for plating CFRP, for example, JP-A-50-56331 and JP-A-60-77 are known.
As disclosed in Japanese Patent No. 977, a mixture of a metal and a resin is subjected to CFR.
A method of applying to the surface layer of the P-tube and Japanese Patent Laid-Open No. 55-1106
It has been proposed to perform some kind of surface treatment, such as a method of performing chemical plating as disclosed in Japanese Patent No. 48.

However, such a method has a drawback that the manufacturing cost is inevitably increased because the treatment itself is often expensive in addition to the need for a base treatment step.

On the other hand, by utilizing the conductivity of carbon fiber, C
A method of subjecting FRP to electroplating is also known, and is disclosed in, for example, Japanese Patent Application Laid-Open No. 51-150581.

However, although this method has the advantage that plating can be performed easily, it is disclosed in JP-A-60-7797.
As mentioned in Japanese Patent No. 7, the CFRP surface is non-uniform, so that there is a drawback that a non-plated portion is easily formed and plating is difficult.

This is plated only on the carbon fiber part,
This is because the resin part is not plated. This was particularly remarkable when the FW method suitable for roll production was used.

Therefore, in order to cover the entire surface with the plating film, it was necessary to plate the plating very thickly.

This takes time and manufacturing cost, and impairs the characteristic of the CFRP roll that it is lightweight. In addition, even with such a thick plating, there are many cases where the plating is not covered and the base remains.

[0015]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and provides a CFRP metal-coated roll in which the surface of a tubular body is electroplated directly and easily, and a method for producing the same. The purpose is to do.

[0016]

That is, according to the present invention, a carbon fiber reinforced plastic pipe layer obtained by circumferentially winding a carbon fiber of an outermost layer by a filament winding method, and a metal circumscribing the pipe layer. A roll made of carbon fiber reinforced plastic characterized by comprising a plated layer.

Further, a carbon fiber reinforced plastic tube body, in which the carbon fibers on the surface layer of the tube body are circumferentially wound by a filament winding method, is formed, and then a resin layer on the outer surface of the tube body is machined. Except for exposing the carbon fibers oriented in the circumferential direction, and subsequently coating the outer surface of the tubular body with a metal by an electroplating method.

The contents of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a view showing a part of the cross section of the roll of the present invention. Reference numeral 1 denotes a CFRP tubular body, the outer periphery of which is directly coated with a metal coating 2 by electroplating without a conductive treatment layer or the like.

The roll is manufactured by the following method.

FIG. 2 is a perspective view showing a CFRP pipe body 1 used in the present invention. The surface carbon fibers are wound in the circumferential direction by the FW method.

As the tubular body 1, any carbon fiber in the surface layer can be used as long as it is wound in the circumferential direction by the FW method.

For example, if necessary, the whole fiber is integrally manufactured by the FW method, or the surface layer of the CFRP pipe manufactured by the FW method or another method such as the sheet winding method is ground. After processing, FW on top of it
It can also be manufactured by circumferentially winding carbon fibers by the method.

In this case, the circumferential winding means the mandrel 1
It is a method of traversing with a width less than the width (band width) of the fiber bundle to be wound with each rotation, and usually 90 ° with respect to the axis.
Is wound in the direction close to.

Any carbon fiber can be used for the tubular body 1. PAN-based carbon fibers, pitch-based carbon fibers, and other carbon fibers can be used. Further, the tensile strength, the tensile elastic modulus, etc. may be determined according to the design conditions.

The resin used for the tubular body 1 is an ordinary CFR.
Any material used for P can be used. In addition to epoxy resins, thermosetting resins such as unsaturated polyester resins, polyimide resins, and phenol resins, thermoplastic resins such as polyether ether ketone. Resins can also be used.

The outer surface of the tubular body 1 is ground by machining until the carbon fibers oriented in the circumferential direction are exposed. Grinding may be performed by a conventional method, and sanding, shot blasting, a cylindrical grinder, a lathe, or the like is used.

If the thickness of the surface layer wound in the circumferential direction is 0.1 mm or more, preferably 0.5 mm or more after grinding, the effect of the present invention can be effectively exhibited.

The tube body 1 whose surface has been ground is subjected to an electroplating process. The electroplating is carried out by energizing in the plating solution with the tubular body 1 as a cathode by a conventional method.

The plating metal used in the present invention may be any one as long as it is usually used in the electroplating method, for example, copper plating, nickel plating,
There are chrome plating, gold plating, silver plating, iron plating, etc.

It is also possible to plate multiple layers of copper-nickel-chromium. The plating metal used may be determined according to the required characteristics.

A tube body 1 having a metal coating 2 formed by plating
Can be obtained as a roll through steps such as polishing as required.

[0033]

By using the present invention, it is possible to easily obtain a roll having a CFRP tube body directly electroplated, as compared with the conventional case. The reason is as follows.

FIG. 3 is an enlarged view of FIG. 1, showing a plated portion. The CFRP 1 is composed of carbon fiber 3 and resin 4. Since the carbon fiber 3 has conductivity and the resin 4 does not have conductivity, when the tube body whose surface is ground to expose the carbon fiber to the surface is subjected to the electroplating process, initially only on the carbon fiber. The plating film 2 is deposited (FIG. 3).

As the plating film 2 grows, the plating films on the carbon fibers gradually bond with each other and finally cover the entire surface of the CFRP (FIG. 4).

However, in the conventional FW method, the surface layer is non-uniform, and the plating is not bonded to the portion with a large amount of resin,
Unplated remains.

As a result of examining the non-uniformity of the surface layer, when the carbon fibers are separated from each other by about 30 to 40 μm, it is 5
If the plating film is bonded to a thickness of about 0 μm, the plated coatings will bond, but if the carbon fibers are separated by 1 mm or more,
It has been revealed that the plated coatings do not bond to each other even when plated to a thickness of 0 μm or more.

Therefore, the distance between the carbon fibers is always 20-.
If the thickness can be maintained at 30 μm or less, uniform plating can be achieved.

However, when the roll is manufactured by the conventional FW method, as shown in FIG. 5, when the fibers are wound, an intersection of the fiber bundles is generated. An enlarged view of the intersecting portion is shown in FIG. 6, and its aa 'cross section is shown in FIG.

At the crossing portion, the fiber bundle moves from the top to the bottom or from the bottom to the top, so that the resin-only portion is formed in the transition portion over a width of 1 mm to several mm.

Since the resin portion did not disappear even by the subsequent mechanical polishing, the surface of the tubular body became non-uniform, and direct electroplating was not possible.

On the other hand, according to the present invention, by winding the fibers of the surface layer of the tubular body in the circumferential direction, the generation of the intersecting portion of the fiber bundle is prevented, so that the spacing between the carbon fibers is always 20 to 30 μm.
It is kept below m, and electroplating on CFRP is easy.

Further, since the surface density of the carbon fiber is high, the proportion of the bonded portion is high, and a higher adhesion strength than the conventional method can be obtained.

Further, in the FW method, since air is easily entrained in the tubular body during manufacturing, it remains as bubbles (voids), and when the surface is ground, the voids are dented (pinned) on the surface of the CFRP tubular body. Hole).

This part is hard to be plated, and
There was also a problem in terms of quality. On the other hand, according to the present invention, since the fibers are wound in the circumferential direction at the time of manufacturing the tubular body, it is easy to apply tension to the fibers.

Therefore, by rolling the outermost layer while applying tension to the rolled tubular body while entraining air, an effect of squeezing the tubular body is generated, and the entrained air can be expelled, and The generation of voids can be suppressed to a very small level.

In addition, when grinding with a cylindrical grinder, CFR
There is a case where P is missing and becomes a groove-like defect, but since the strength in the grinding direction is increased by winding in the circumferential direction, there is almost no missing.

Therefore, it is possible to obtain a tubular body having a good surface quality with a good yield. Therefore, the main pipe body can be used for applications in which the surface of the CFRP pipe body is simply ground without plating.

[0049]

【Example】

[0050]

Example 1 A PAN-based carbon fiber (trade name: Torayca T3 manufactured by Toray Industries, Inc.) was used for a mandrel having a diameter of 90 mm and a length of 1000 mm.
While being impregnated with liquid epoxy resin, it was wound with a thickness of 4 mm at an angle of ± 15 ° with respect to the shaft.

After being wound around it in a thickness of 2 mm in the circumferential direction, it was heat-cured and the mandrel was decoreed to obtain a tubular body. The surface layer was entirely covered with resin.

After that, a stainless steel (SUS 304) journal was attached, and by grinding using a cylindrical grinder, 1 mm was ground to an outer diameter of 100 mm, and accuracy as a roll was obtained, and carbon fiber wound in the circumferential direction was obtained. Exposed. Almost no pinholes were found on the surface of the tubular body.

50 μm of this in a copper sulfate solution by a conventional method
Copper plating was performed to the thickness of.

As a result, the surface layer was completely covered with the copper plating layer.

[0055]

[Comparative Example] In Example 1, the fiber was moved to ± 15 ° by 6 mm.
The tube was wound to form a tubular body, and then the same steps were performed.

Approximately 0.5 mm on the surface of the tubular body after grinding
Several diameter pinholes were found. Even when plating was performed to a thickness of 400 μm, about 20 spots and non-plated portions with a width of 1 mm to 3 mm remained.

[0057]

EFFECTS OF THE INVENTION By using the present invention, it is possible to uniformly plate CFRP by a simple method, and it is possible to reduce the manufacturing cost of the plating roll because the electroconductive treatment is unnecessary. Also, the adhesion strength can be improved.

Further, according to the present invention, it is possible to obtain a CFRP tube having good surface properties and a high grinding yield.

[Brief description of drawings]

FIG. 1 is a sectional view of a roll of the present invention.

FIG. 2 is a perspective view of a CFRP pipe body used for the roll of the present invention.

FIG. 3 is a conceptual diagram showing an initial state of a plating film on CFRP.

FIG. 4 is a conceptual diagram showing a state in which a plating film has grown on CFRP.

FIG. 5 is a schematic diagram showing a surface layer of a conventional FW method.

FIG. 6 is an enlarged view of an intersecting portion of FIG.

7 is a cross-sectional view taken along the line aa 'of FIG.

[Explanation of symbols]

 1 CFRP 2 Plated film 3 Carbon fiber 4 Resin

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location D01F 9/12 F16C 13/00 A 8613-3J // B29K 105: 08 B29L 31:32 (72) Inventor Taketoshi Enui 5-13-16 Ginza, Chuo-ku, Tokyo Inside Nippon Steel Chemical Co., Ltd.

Claims (2)

[Claims] 1. The carbon fiber of the outermost layer comprises a carbon fiber reinforced plastic pipe layer wound in the circumferential direction by a filament winding method, and a metal plating layer circumscribing the pipe layer. Carbon fiber reinforced plastic roll. 2. A resin layer on the outer surface of a tubular body made of carbon fiber reinforced plastic formed by circumferentially winding carbon fiber in the surface layer of the tubular body by a filament winding method and then machining the tubular body. Except for exposing the carbon fibers oriented in the circumferential direction, and subsequently coating the outer surface of the tubular body with a metal by an electroplating method.