JP2022189434A - Manufacturing method of roll, and roll - Google Patents

Abstract

To provide a manufacturing method of a roll capable of forming an even coat efficiently to obtain a roll with high rotation accuracy, and a roll with high rotation accuracy.SOLUTION: A manufacturing method of a roll comprises, on the outer peripheral surface side of a first cylindrical body 10 containing carbon fiber reinforced plastic, subjecting an outer peripheral surface 21 of a second cylindrical body 20 to chromium plating to form a coating while rotating a roll-shaped laminate 110 around an axis O1, with a direction of the axis O1 of the roll-shaped laminate 110 provided with the second cylindrical body 20 containing metal set horizontally, and the roll laminate 110 partially immersed in a plating solution 211.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present invention relates to a roll manufacturing method and a roll.

Rolls made of carbon fiber reinforced plastic (CFRP) are known as rolls such as guide rolls used for processing and conveying webs such as resin films. However, the CFRP roll has a low surface hardness and has a problem that the outer peripheral surface is easily damaged. Therefore, it has been proposed to form a film such as a chromium plating film on the outer peripheral surface of a roll made of CFRP (for example, Patent Documents 1 to 3).

JP-A-6-210763 JP 2015-214727 A JP 2017-71476 A

However, it is difficult to form a uniform film by conventional methods such as those disclosed in Patent Documents 1 to 3, and a roll that requires high precision requires time for post-processing.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing a roll capable of efficiently forming a uniform coating and obtaining a roll with high rotational accuracy, and to provide a roll with high rotational accuracy.

The present invention has the following aspects.
[1] While rotating a roll-shaped laminated body in which a second cylindrical body containing a metal is provided on the outer peripheral surface side of the first cylindrical body containing the carbon fiber reinforced plastic around the axis, A method for manufacturing a roll, wherein the outer peripheral surface of a cylindrical body is plated with chromium to form a coating.
[2] The method for producing a roll according to [1], wherein the roll-shaped laminate is subjected to chromium plating with the axial direction parallel to the horizontal direction.
[3] The roll laminate is adjusted such that the ratio of the distance from the lower end of the roll laminate to the liquid surface of the plating solution to the outer diameter of the roll laminate is 1/14 or more and 13/28 or less. is partially immersed in the plating solution, the roll manufacturing method according to [2].
[4] The method for manufacturing a roll according to any one of [1] to [3], wherein the rotational speed of the roll laminate around its axis is 0.02 rpm or more and 20.0 rpm or less.
[5] The roll manufacturing method according to any one of [1] to [4], wherein the coating has a hardness of HV750 or higher.
[6] The method for producing a roll according to any one of [1] to [5], wherein the first cylindrical body has a thickness of 3 mm or more and 50 mm or less.
[7] The roll manufacturing method according to any one of [1] to [6], wherein the length of the first cylindrical body is 2 m or more and 12 m or less.
[8] The method for manufacturing a roll according to any one of [1] to [7], wherein the outer peripheral surface of the second cylindrical body is subjected to liquid honing and then subjected to chromium plating.
[9] The roll manufacturing method according to any one of [1] to [8], wherein the film having a thickness of 0.04 mm or more and 0.70 mm or less is formed by chromium plating.
[10] The method for manufacturing a roll according to any one of [1] to [9], which manufactures a roll for web processing or web transport.
[11] A mounting step of mounting the second cylindrical body on the outer peripheral surface side of the first cylindrical body, a plating step of chromium plating the outer peripheral surface of the second cylindrical body, and a surface of the coating A method for manufacturing a roll according to any one of [1] to [10], comprising a polishing step of polishing.
[12] The method for manufacturing a roll according to [11], wherein the thickness of the film is set to 0.01 mm or more and 0.50 mm or less by polishing in the polishing step.
[13] The method for producing a roll according to any one of [1] to [12], wherein the circularity of the longitudinal center of the roll immediately after the chromium plating treatment is 0.10 mm or less.
[14] The method for manufacturing a roll according to any one of [1] to [13], wherein the roll has a total runout tolerance of 0.13 mm or less immediately after the chromium plating treatment.
[15] A first cylindrical body containing carbon fiber reinforced plastic, a second cylindrical body provided on the outer peripheral surface side of the first cylindrical body and containing a first metal, and the second cylindrical body a coating that is provided on the outer peripheral surface of the body and contains a second metal, wherein the length of the first cylindrical body and the second cylindrical body is 2 m or more and 12 m or less, and the cylindricity is 0.5 m. A roll that is 20 mm or less.
[16] A first cylindrical body containing carbon fiber reinforced plastic, a second cylindrical body provided on the outer peripheral surface side of the first cylindrical body and containing a first metal, and the second cylindrical body a coating that is provided on the outer peripheral surface of the body and contains a second metal, wherein the length of the first cylindrical body and the second cylindrical body is 2 m or more and 12 m or less, and the total runout tolerance is 0 .13 mm or less.
[17] The roll according to [15] or [16], which is a roll for web processing or web transport.

ADVANTAGE OF THE INVENTION According to this invention, the manufacturing method of the roll which can form a uniform film efficiently and can obtain a roll with high rotational precision, and a roll with high rotational precision can be provided. Especially in the case of a long roll, a uniform coating can be efficiently formed.

It is a sectional view showing one embodiment of a roll manufactured by a manufacturing method of the present invention. FIG. 3 is a cross-sectional view showing an embodiment of a plating step in the roll manufacturing method of the present invention.

An example of the roll of the present invention and its manufacturing method will be described below with reference to the drawings. It should be noted that the dimensions and the like of the drawings illustrated in the following description are only examples, and the present invention is not necessarily limited to them, and can be implemented with appropriate changes within the scope of not changing the gist of the present invention. .

The roll manufacturing method of the present embodiment is a method of manufacturing the roll 100 illustrated in FIG. The roll 100 includes a first cylindrical body 10, a second cylindrical body 20 provided on the outer peripheral surface side of the first cylindrical body 10, and a coating 30 provided on the outer peripheral surface 21 of the second cylindrical body 20. and journals 40 fitted to both ends of the first cylindrical body 10 in the direction of the axis O1.

In the roll 100 , the second cylindrical body 20 is mounted on the outer peripheral surface side of the first cylindrical body 10 so that the first cylindrical body 10 is entirely covered with the second cylindrical body 20 . The axis of the first cylindrical body 10 and the axis of the second cylindrical body 20 coincide with the axis O1 of the roll 100 .

The first cylinder 10 is a cylinder containing carbon fiber reinforced plastic. The first cylindrical body 10 is preferably made of carbon fiber reinforced plastic or a mixture of carbon fiber reinforced plastic and glass fiber reinforced plastic because of its light weight and high elastic modulus.

The Young's modulus of the first cylindrical body 10 is preferably 90 GPa or higher, more preferably 120 GPa or higher. If the Young's modulus of the first cylindrical body 10 is equal to or higher than the lower limit, the rigidity of the roll 100 is increased, so that bending of the roll 100 can be reduced. The upper limit of the Young's modulus of the first cylindrical body 10 is not particularly limited, and is set to 500 GPa because the upper limit of the Young's modulus of carbon fibers is about 900 GPa.

Carbon fiber reinforced plastic consists of carbon fiber and matrix resin.
Carbon fibers include pitch-based carbon fibers, polyacrylonitrile-based (hereinafter referred to as PAN-based) carbon fibers, and the like.

Pitch-based carbon fiber is "mesophase pitch, that is, a resin that partially exhibits a liquid crystal structure produced by processing petroleum tar, coal tar, etc., or an artificially synthesized mesophase pitch that is spun and made infusible. filament fibers consisting essentially of carbon with a highly developed graphite crystal structure in the direction of the fiber axis, produced by further carbonization.
The PAN-based carbon fiber is "a filament fiber composed substantially only of carbon, which is produced by infusibilizing and further carbonizing a fiber composed of a polyacrylonitrile-based resin polymerized with acrylonitrile as a main component".
As the carbon fiber, it is preferable to use a combination of pitch-based carbon fiber and PAN-based carbon fiber from the viewpoints of high elastic modulus, low thermal expansion, and high productivity. As carbon fibers, pitch-based carbon fibers and PAN-based carbon fibers may be used alone.

The matrix resin includes a cured product of a thermosetting resin or a thermoplastic resin.
Thermosetting resins include epoxy resins, vinyl ester resins, unsaturated polyester resins, polyimide resins, maleimide resins, phenol resins, and the like.
Thermosetting resins may be used alone or in combination of two or more.

Thermoplastic resins include polyamide (nylon 6, nylon 66, etc.), polyolefin (polyethylene, polypropylene, etc.), modified polyolefin, polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polycarbonate, polyamideimide, polyphenylene oxide, polysulfone, polyether. Sulfone, polyetheretherketone, polyetherimide, polystyrene, acrylonitrile-butylene-styrene copolymer, polyphenylene sulfide, liquid crystal polyester, acrylonitrile-styrene copolymer and the like.
The thermoplastic resin may be used alone or in combination of two or more.

The matrix resin may be flame retardant, weather resistance improver, antioxidant, heat stabilizer, UV absorber, plasticizer, lubricant, colorant, compatibilizer, conductive filler, etc. It may contain various additives such as.

The first cylindrical body 10 can be produced, for example, by a known method (sheet winding method, etc.) using prepreg.
As prepregs, there are UD prepregs in which carbon fibers are aligned in one direction and impregnated with a matrix resin, cross prepregs in which cloth woven with carbon fibers is impregnated with a matrix resin, and glass fibers are aligned in one direction and a matrix resin is impregnated. Examples include an impregnated glass UD prepreg and a glass cloth prepreg obtained by impregnating a cloth woven with glass fibers with a matrix resin.

The second cylindrical body 20 is a cylindrical body containing metal (first metal).
Examples of metals contained in the second cylindrical body 20 include stainless steel, titanium, iron, aluminum, copper, and nickel. From the viewpoint of corrosion resistance, stainless steel and titanium are preferable as the metal. Iron or titanium is preferable as the metal because of its small coefficient of thermal expansion. From the viewpoint of light weight, aluminum is preferable as the metal. The metal forming the second cylindrical body 20 may be of one type or two or more types.

Coating 30 is a coating containing a second metal. Coating 30 is formed on the entire outer peripheral surface 21 of second cylindrical body 20 . Coating 30 may include a plurality of coatings made of different components. For example, a first coating can be placed on the outer peripheral surface 21 of the second cylinder 20 and a second coating can be placed on the first coating. In this case, the hardness of the first coating is preferably lower than that of the second coating from the viewpoint of workability and scratch resistance.

The second metal is not particularly limited, and examples thereof include chromium, nickel, copper and the like. The metal forming the coating 30 may be of one type or two or more types. Chromium is preferable as the second metal from the viewpoint of scratch resistance. That is, the coating 30 is preferably a coating containing chromium, more preferably a chromium plating film. Preferably, the second metal is different than the first metal. When the first metal is copper, both workability and scratch resistance can be achieved by applying chromium as the second metal after processing grooves or the like in this portion.

The hardness of the film 30, which is a chromium plating film, is preferably HV750 or higher, more preferably HV850 or higher. When the hardness of the coating 30 is equal to or higher than the lower limit value, the coating 30 is more resistant to scratches. The upper limit of the hardness of the coating 30 is not particularly limited, and is substantially HV900.
The hardness of the coating 30 is Vickers hardness measured in accordance with JIS Z 2244:2009.

(Roll manufacturing method)
A method of manufacturing the roll 100 in which the film 30 is a chromium plating film will be described below.
In this embodiment, while rotating the roll-shaped laminated body 110 in which the second cylindrical body 20 is provided on the outer peripheral surface side of the first cylindrical body 10 around the axis O1, the outer peripheral surface 21 of the second cylindrical body 20 is rotated. is subjected to chromium plating treatment to form a film 30 .

Examples of the method for manufacturing the roll 100 of the present embodiment include a method including the following mounting process, base polishing process, plating process, and polishing process.
Mounting step: The second cylindrical body 20 is mounted on the outer peripheral surface side of the first cylindrical body 10 .
Base polishing step: The outer peripheral surface 21 of the second cylindrical body 20 is polished.
Plating step: The outer peripheral surface 21 of the second cylindrical body 20 is plated with chrome to form the film 30 .
Polishing step: The surface of the film 30 is polished.

<Mounting process>
A second cylindrical body 20 is mounted on the outer peripheral surface side of the first cylindrical body 10, and they are tightly integrated. As a result, the roll-shaped laminated body 110 in which the second cylindrical body 20 is provided on the outer peripheral surface side of the first cylindrical body 10 is obtained.

It is preferable to grind the outer peripheral surface of the first cylindrical body 10 before attachment in order to facilitate the attachment of the second cylindrical body 20 to the outer peripheral surface side of the first cylindrical body 10 . Examples of the grinding method include a method of grinding using a known metal grinding machine.

The length of the first cylindrical body 10 is preferably 2 m or more and 12 m or less, more preferably 3 m or more and 10 m or less. In this embodiment, a uniform coating 30 can be efficiently formed even with a long roll 100 having a first cylindrical body 10 of 3 m or longer.

The outer diameter of the first cylindrical body 10 is preferably 50 mm or more and 375 mm or less, more preferably 80 mm or more and 350 mm or less. If the outer diameter of the first cylindrical body 10 is equal to or greater than the lower limit of the above range, the outer peripheral surface of the first cylindrical body 10 can be ground with high accuracy. If the outer diameter of the first cylindrical body 10 is equal to or less than the upper limit of the above range, the coating 30 can be easily plated.

The thickness of the first cylindrical body 10 is preferably 3 mm or more and 50 mm or less, more preferably 5 mm or more and 30 mm or less. If the thickness of the first cylindrical body 10 is equal to or greater than the lower limit of the range, the thickness of the first cylindrical body 10 is moderate, and the roll 100 bends due to the rigidity of the second cylindrical body 20. less to do If the thickness of the first cylindrical body 10 is equal to or less than the upper limit of the above range, cracks are less likely to occur when manufacturing the first cylindrical body 10 .

The length of the second cylindrical body 20 is preferably 2 m or more and 12 m or less, more preferably 3 m or more and 10 m or less. The length of the second cylinder 20 can be the same length as the length of the first cylinder 10 .

The inner diameter of the second cylindrical body 20 is such that the second cylindrical body 20 is mounted on the outer peripheral surface side of the first cylindrical body 10, and the second cylindrical body 20 and the first cylindrical body 10 are tightly integrated. From this point of view, it is preferable that the outer diameter is the same as or smaller than the outer diameter of the first cylindrical body 10 .

The thickness of the second cylindrical body 20 is preferably 0.1 mm or more and 10.0 mm or less, more preferably 0.5 mm or more and 5.0 mm or less. If the thickness of the second cylindrical body 20 is equal to or greater than the lower limit value of the above range, the rigidity of the second cylindrical body 20 does not become too low, and it becomes easy to mount the second cylindrical body 10 on the first cylindrical body 10 . If the thickness of the second cylindrical body 20 is equal to or less than the upper limit of the above range, the mass of the second cylindrical body 20 does not become too large, and the effect of reducing the weight of the roll is improved.

(Plating process)
For example, chrome plating is performed by the plating apparatus 200 illustrated in FIG.
The plating apparatus 200 includes a plating bath 210 containing a plating solution 211, a power source 212, an anode 213 electrically connected to the power source 212, and a rotating shaft 214 supporting the journal 40 so as to be rotatable around its axis. I have. In plating apparatus 200 , anode 213 is arranged at the bottom of plating tank 210 . In addition, a rotating shaft 214 that rotatably supports the journal 40 around its axis is electrically connected to the power supply 212 and functions as a cathode, so that electricity flows to the outer peripheral surface 21 of the second cylindrical body 20 through the journal 40. It's becoming

In the present embodiment, the roll laminate 110 is partially immersed in the plating solution 211 contained in the plating bath 210 with the direction of the axis O1 of the roll laminate 110 parallel (horizontal) to the horizontal direction. . In this state, the roll-shaped laminate 110 is rotated around the axis O<b>1 and subjected to chromium plating to form the coating 30 on the outer peripheral surface 21 of the second cylindrical body 20 .

By applying the chromium plating treatment while rotating the roll laminate 110 around the axis O1, the uniform coating 30 can be efficiently formed on the outer peripheral surface 21 of the second cylindrical body 20 . In addition, by setting the direction of the axis O1 of the roll laminate 110 horizontally, the roll laminate 110 is easy to handle and the chromium plating process is facilitated, and the uniform coating 30 can be formed more efficiently. In addition, by partially immersing the roll-shaped laminated body 110 in the plating solution 211 and performing chromium plating, it is not necessary to use a complicated sealing mechanism for rotating the roll during plating, and plating can be performed efficiently. .

The rotational speed of the roll laminate 110 around the axis O1 during chromium plating is preferably 0.02 rpm or more and 20.0 rpm or less, more preferably 0.10 rpm or more and 10.0 rpm or less. If the rotation speed of the roll laminate 110 is at least the lower limit value of the above range, it is possible to obtain the coating 30 with little plating unevenness and good cylindricity. If the rotation speed of the roll laminate 110 is equal to or lower than the upper limit of the above range, the coating 30 with good cylindricity can be obtained.

The angle of inclination of the direction of the axis O1 of the roll laminate 110 with respect to the horizontal direction during chromium plating is preferably 2° or less, more preferably 1° or less, and particularly preferably 0°, in order to uniformly form the coating 30. .

The ratio (H/D) of the distance H from the lower end of the roll laminate 110 to the liquid surface of the plating solution 211 with respect to the outer diameter D of the roll laminate 110 is preferably 1/14 or more and 13/28 or less. /8 or more and 3/7 or less are more preferable. When H/D is equal to or higher than the lower limit of the above range, the current density is less likely to increase locally, and application of the coating 30 is facilitated. When H/D is equal to or less than the upper limit of the above range, it is easy to prevent the plating solution from leaking out of the plating bath from the journal portion of the roll, and the coating 30 can be easily applied. Note that the outer diameter D of the roll laminate 110 matches the outer diameter of the second cylindrical body 20 .

The outer peripheral surface 21 of the second cylindrical body 20 is preferably subjected to liquid honing before chrome plating. By subjecting the outer peripheral surface 21 of the second cylindrical body 20 to liquid honing and then chromium plating, the adhesion between the second cylindrical body 20 and the coating 30 is improved.

Particles used for liquid honing include, for example, silica sand, alumina, and glass beads.
The average particle diameter of particles used for liquid honing is preferably 120 μm or more and 250 μm or less, more preferably 150 μm or more and 200 μm or less.
The average particle size is measured according to JIS Z 8815:1994. Depending on the web such as film, the outer peripheral surface 21 of the second cylindrical body 20 may be sandblasted to form a so-called satin surface for the purpose of improving the coefficient of friction between the roll and the web.

Note that liquid honing may not be applied to the outer peripheral surface 21 of the second cylindrical body 20 before the chrome plating treatment. In addition, the outer peripheral surface 21 of the second cylindrical body 20 before the chrome plating treatment is preferably polished before liquid honing for the purpose of improving the roll roundness, cylindricity, and total runout tolerance after the coating 30 is formed. . A method for polishing the outer peripheral surface 21 of the second cylindrical body 20 is not particularly limited, and a known method can be adopted.

The thickness (plating thickness) of the coating 30 formed by chrome plating in the plating step, that is, the thickness of the coating 30 immediately after the chrome plating is preferably 0.04 mm or more and 0.70 mm or less, and 0.04 mm or more and 0.30 mm or less. is more preferred. If the thickness of the coating 30 immediately after the chromium plating treatment is equal to or greater than the lower limit of the above range, the chromium plating can be left on the entire outer peripheral surface 21 of the second cylindrical body 20 in the polishing step of the coating 30 . If the thickness of the coating 30 immediately after the chromium plating treatment is equal to or less than the upper limit of the above range, the coating 30 can be obtained in a relatively short time.

The cylindricity of the roll 100 immediately after the chrome plating treatment is preferably 0.20 mm or less, more preferably 0.15 mm or less, and even more preferably 0.10 mm or less. If the cylindricity of the roll 100 is equal to or less than the upper limit, the surface of the roll 100 can be easily polished, resulting in high rotational accuracy.
The cylindricity of the roll is measured according to JIS B 0672-2:2002.

The circularity of the roll 100 right after the chrome plating treatment at the center in the roll longitudinal direction is preferably 0.10 mm or less, more preferably 0.05 mm or less. If the roundness of the roll 100 is equal to or less than the upper limit, the rotation accuracy of the roll 100 will be high.
In addition, the circularity of the roll longitudinal direction center of a roll is measured based on JISB0621:1984.

The total run-out tolerance (static run-out) of the roll 100 immediately after chromium plating is preferably 0.13 mm or less, more preferably 0.10 mm or less. If the total run-out tolerance of the roll 100 is equal to or less than the upper limit value, the rotation accuracy of the roll 100 will be high.
In addition, the total deflection tolerance of the roll is measured according to JIS B0021:1998.

(polishing process)
After the plating process, the surface of the film 30 is polished. As a result, the surface of the film 30 is smoothed, and the rotation accuracy of the roll 100 is improved.
The method of polishing the surface of the film 30 is not particularly limited, and examples thereof include buffing with a whetstone and polishing with a vertical polishing machine.

In the polishing step, the thickness of the coating 30 is preferably 0.01 mm or more and 0.50 mm or less, more preferably 0.02 mm or more and 0.35 mm or less, and 0.02 mm or more and 0.30 mm or less. is more preferred. If the thickness of the coating 30 after polishing is equal to or greater than the lower limit of the above range, the risk of exposing the second cylindrical body 20 is low, and the coating 30 can be left on the entire surface of the second cylindrical body 20 . If the thickness of the coating 30 after polishing is equal to or less than the upper limit of the above range, the coating 30 can be processed in a relatively short time.

The roll 100 is obtained by the manufacturing method described above.
The cylindricity of the roll 100 as the final product is preferably 0.20 mm or less, more preferably 0.15 mm or less, and even more preferably 0.10 mm or less. If the cylindricity of the roll 100 is equal to or less than the upper limit, the rotation accuracy of the roll 100 will be high.
The circularity of the roll 100 as the final product at the center in the roll longitudinal direction is preferably 0.10 mm or less, more preferably 0.05 mm or less. If the roundness of the roll 100 is equal to or less than the upper limit, the rotation accuracy of the roll 100 will be high.
The total deflection tolerance (static deflection) of the roll 100 as the final product is preferably 0.13 mm or less, more preferably 0.10 mm or less. If the total run-out tolerance of the roll 100 is equal to or less than the upper limit value, the rotation accuracy of the roll 100 will be high.

The use of the roll 100 is not particularly limited, and a roll for web processing or web transport is preferable. Specific examples of applications of the roll 100 include guide rolls, touch rolls, nip rolls, transport rolls, and the like.

As described above, in the present embodiment, the coating 30 is formed on the outer peripheral surface 21 of the second cylindrical body 20 in order to apply the chromium plating treatment while rotating the roll laminate 110 around the axis O1. Therefore, the uniform film 30 can be efficiently formed, and the roll 100 with high rotational accuracy can be obtained. The film 30 containing the second metal other than chromium can be formed by performing the same plating treatment as the chromium plating treatment, except that the plating solution for plating the second metal is used.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. The components may be replaced, and the modified examples described above may be combined as appropriate.

EXAMPLES The present invention will be specifically described below with reference to Examples, but the present invention is not limited by the following description.
[Example 1]
A carbon fiber reinforced plastic pipe having an outer diameter of 100 mm and an inner diameter of 80 mm was produced by a sheet winding method using the following three types of prepregs. The carbon fibers of each UD prepreg were oriented in the circumferential, axial and oblique directions of the first cylinder. The Young's modulus of the first cylinder was 210 GPa.
- UD prepreg (HyEJ34M65PD, pitch-based carbon fiber, matrix resin: epoxy resin, manufactured by Mitsubishi Chemical Corporation).
- UD prepreg (HyEJ17, PAN-based carbon fiber, matrix resin: epoxy resin, manufactured by Mitsubishi Chemical Corporation).
- UD prepreg (HyEJ25, PAN-based carbon fiber, matrix resin: epoxy resin, manufactured by Mitsubishi Chemical Corporation).

A pipe was cut to a length of 2600 mm, and journals made of SUS304 were adhered to both ends thereof. The surface of the pipe was ground to obtain a first cylindrical body made of carbon fiber reinforced composite material. The outer diameter of the first cylinder was 98.6 mm.
A metal sleeve (metal: SUS304, outer diameter: 100 mm, thickness: 0.7 mm) was used as the second cylindrical body, and the first cylindrical body was mounted in the second cylindrical body to obtain a roll laminate. . Next, the outer peripheral surface of the second cylindrical body in the roll laminate was polished.

Using the plating apparatus 200 illustrated in FIG. 2, the roll laminate is partially immersed in the chromium plating solution (plating solution 211) contained in the plating tank 210 with the axial direction of the roll laminate set horizontally. , chromium plating was applied while rotating the roll laminate around the axis to form a coating (thickness: 50 μm) on the outer peripheral surface of the second cylindrical body.
The rotation speed around the axis of the roll laminate during chromium plating was set to 3.0 rpm. The ratio (H/D) of the distance from the lower end of the roll laminate to the liquid surface of the plating solution to the outer diameter D of the roll laminate was 3/8.
Next, the surface of the film was polished until the film thickness reached 30 μm, and a roll having a chromium plating film formed on the entire outer peripheral surface of the second cylindrical body was obtained.

[Comparative Example 1]
A roll was produced in the same manner as in Example 1, except that the roll-shaped laminate was vertically placed in the plating tank without being rotated during the chromium plating treatment.

[Cylindricity]
The cylindricity of the roll was measured according to JIS B 0672-2:2002.

[Roundness]
The circularity of the central portion in the longitudinal direction of the roll was measured according to JIS B 0621:1984.

[Total Runout Tolerance]
The total runout tolerance of the roll was measured according to JIS B 0021:1998.

[Evaluation of Rotation Accuracy]
The rotation accuracy of the roll produced in each example was evaluated using a micrometer and a test indicator.

Table 1 shows the results of measuring the cylindricity of the roll, the roundness of the central portion in the longitudinal direction of the roll, and the total run-out tolerance of the roll of each example immediately after the chromium plating treatment and after the coating surface was polished.

DESCRIPTION OF SYMBOLS 10... First cylindrical body 20... Second cylindrical body 21... Outer peripheral surface 30... Coating O1... Axis line 40... Journal 100... Roll 200... Plating device 210... Plating bath 211... Plating liquid, 212... power supply, 213... anode, 214... rotating shaft.

Claims (17)

While rotating a roll-shaped laminate in which a second cylindrical body containing metal is provided on the outer peripheral surface side of a first cylindrical body containing carbon fiber reinforced plastic around the axis, the second cylindrical body A method for manufacturing a roll, in which the outer peripheral surface is subjected to chromium plating to form a coating. 2. The method of manufacturing a roll according to claim 1, wherein the chrome plating process is performed with the axial direction of the roll laminate parallel to the horizontal direction. The plating solution is applied to the roll laminate so that the ratio of the distance from the lower end of the roll laminate to the liquid surface of the plating solution to the outer diameter of the roll laminate is 1/14 or more and 13/28 or less. The method for manufacturing a roll according to claim 2, wherein the roll is partially immersed in The roll manufacturing method according to any one of claims 1 to 3, wherein the rotation speed around the axis of the roll laminate is 0.02 rpm or more and 20.0 rpm or less. The roll manufacturing method according to any one of claims 1 to 4, wherein the coating has a hardness of HV750 or higher. The roll manufacturing method according to any one of claims 1 to 5, wherein the first cylindrical body has a thickness of 3 mm or more and 50 mm or less. The roll manufacturing method according to any one of claims 1 to 6, wherein the first cylindrical body has a length of 2 m or more and 12 m or less. The roll manufacturing method according to any one of claims 1 to 7, wherein the outer peripheral surface of the second cylindrical body is subjected to liquid honing and then subjected to chrome plating. The roll manufacturing method according to any one of claims 1 to 8, wherein the film having a thickness of 0.04 mm or more and 0.70 mm or less is formed by chromium plating. The method for producing a roll according to any one of claims 1 to 9, for producing a roll for web processing or web transport. A mounting step of mounting the second cylindrical body on the outer peripheral surface side of the first cylindrical body, a plating step of chromium plating the outer peripheral surface of the second cylindrical body, and a polishing step of polishing the surface of the coating. The method for manufacturing a roll according to any one of claims 1 to 10, comprising the steps of: 12. The method of manufacturing a roll according to claim 11, wherein the thickness of the film is set to 0.01 mm or more and 0.50 mm or less by polishing in the polishing step. 13. The method for manufacturing a roll according to any one of claims 1 to 12, wherein the roll has a circularity of 0.10 mm or less at the center in the longitudinal direction immediately after the chromium plating treatment. 14. The method for manufacturing a roll according to any one of claims 1 to 13, wherein the roll has a total runout tolerance of 0.13 mm or less immediately after the chrome plating treatment. A first cylindrical body containing carbon fiber reinforced plastic, a second cylindrical body provided on the outer peripheral surface side of the first cylindrical body and containing a first metal, and an outer periphery of the second cylindrical body a coating provided on the surface and containing a second metal,
The first cylindrical body and the second cylindrical body have a length of 2 m or more and 12 m or less,
A roll having a cylindricity of 0.20 mm or less. A first cylindrical body containing carbon fiber reinforced plastic, a second cylindrical body provided on the outer peripheral surface side of the first cylindrical body and containing a first metal, and an outer periphery of the second cylindrical body a coating provided on the surface and containing a second metal,
The first cylindrical body and the second cylindrical body have a length of 2 m or more and 12 m or less,
A roll having a total run-out tolerance of 0.13 mm or less. 17. A roll according to any one of claims 15 or 16, which is a web treatment or web transport roll.

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