JP2020116514A - Wire processing method - Google Patents

Abstract

To provide a wire processing method that can exert high-cleaning effect without affecting property of a wire.SOLUTION: A wire processing method includes: rotating a first roller while bringing the first roller into contact with a wire; and rotating a second roller having surface adhesiveness while bringing the second roller into contact with a surface of the first roller.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for treating a wire rod.

In the superconducting wire, for example, a superconducting layer is formed on a base material made of a metal tape via an intermediate layer having a good crystal orientation. A protective layer is formed on the superconducting layer to protect the superconducting layer. A metal stabilizing layer is formed on the protective layer.

In order to improve the characteristics of the superconducting wire, it is effective to clean the surface by cleaning the wire, but foreign substances attached to the wire are difficult to remove by a non-contact cleaning method such as air cleaning. On the other hand, the method of cleaning the surface of the wire by brushing or the like has a high cleaning effect, but the surface of the wire may be damaged and the characteristics of the superconducting wire may be affected.
Patent Document 1 describes performing ultrasonic cleaning while the superconducting wire is immersed in water. The ultrasonic cleaning does not damage the wire and has a good cleaning effect. However, the underlayer, the intermediate layer, and the superconducting layer may be hydroxylated in water to cause a change in chemical composition. Therefore, in the method described in Patent Document 1, the uniformity of the degree of orientation becomes low, which may affect the characteristics of the superconducting wire.

JP, 2011-181192, A

An object of one embodiment of the present invention is to provide a method for treating a wire rod that can obtain a high cleaning effect without affecting the characteristics of the wire rod.

One aspect of the present invention provides a method for treating a wire rod, in which a first roller is rotated in contact with the wire rod and a second roller having surface adhesiveness is rotated in contact with the surface of the first roller. To do.

It is preferable that the surface of the first roller has irregularities capable of capturing the adhered matter on the surface of the wire.

In the method of treating the wire rod, it is preferable that the surface of the wire rod that has passed through the first roller is electrically neutralized.

It is preferable that the first roller has a dimension in the width direction of the wire material that is 1.5 times or more the width of the wire material.

According to one aspect of the present invention, a high cleaning effect can be obtained without affecting the characteristics of the wire.

It is a block diagram of the processing apparatus which can implement the processing method of the wire rod of embodiment. It is process drawing of the processing method using the processing apparatus of FIG. It is a perspective view which shows the processing apparatus of FIG. 1 typically. It is explanatory drawing of the process of electrically neutralizing a wire with an ionizer. It is explanatory drawing of the process of following the previous figure. It is explanatory drawing of the process of following the previous figure. It is the schematic which shows the constructional example of a wire. It is the schematic which shows the constructional example of a wire. It is the schematic which shows the constructional example of a wire. It is the schematic which shows the constructional example of a wire. It is the schematic which shows the constructional example of a wire.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

[wire]
FIG. 7 is a schematic view showing a superconducting wire 10 which is a structural example of the wire. As shown in FIG. 7, the superconducting wire 10 includes a superconducting laminated body 5, a second protective layer 6, and a stabilizing layer 8. The superconducting wire 10 is a tape wire formed in a tape shape.
The superconducting laminate 5 has a structure in which the oxide superconducting layer 3 and the first protective layer 4 are formed on the base material 1 with the intermediate layer 2 interposed therebetween. Specifically, the superconducting laminate 5 has a structure in which the intermediate layer 2, the oxide superconducting layer 3, and the first protective layer 4 are laminated in this order on one surface of the base material 1.

In FIG. 7, the Y direction is the thickness direction of the superconducting wire 10, and is the direction in which the base material 1, the intermediate layer 2, the oxide superconducting layer 3, the first protective layer 4, and other layers are stacked. The X direction is the width direction of the superconducting wire 10 and is a direction orthogonal to the longitudinal direction and the thickness direction of the superconducting wire 10.

The base material 1 has a tape shape and is made of, for example, metal. Specific examples of the metal constituting the base material 1 include nickel alloys represented by Hastelloy (registered trademark); stainless steel; oriented Ni—W alloys in which a texture is introduced into nickel alloys. One surface of the base material 1 (the surface on which the intermediate layer 2 is formed) is referred to as a first main surface 1a.

The intermediate layer 2 is provided between the base material 1 and the oxide superconducting layer 3. The intermediate layer 2 is formed on the first major surface 1a of the base material 1. The intermediate layer 2 may have a multi-layered structure and may have, for example, a diffusion prevention layer, a bed layer, an alignment layer, a cap layer, and the like in the order from the base material 1 side to the oxide superconducting layer 3 side.

The diffusion prevention layer has a function of suppressing a part of components of the base material 1 from diffusing and being mixed as an impurity into the oxide superconducting layer 3 side. The diffusion prevention layer is made of, for example, Si ₃ N ₄ , Al ₂ O ₃ , GZO (Gd ₂ Zr ₂ O ₇ ), or the like.
A bed layer may be formed on the diffusion prevention layer to reduce the reaction at the interface between the base material 1 and the oxide superconducting layer 3 and to improve the orientation of the layer formed thereon. Examples of the material of the bed layer include Y ₂ O ₃ , Er ₂ O ₃ , CeO ₂ , Dy ₂ O ₃ , Eu ₂ O ₃ , Ho ₂ O ₃ and La ₂ O ₃ .
The orientation layer is formed of a biaxially oriented material to control the crystal orientation of the cap layer thereon. Examples of the material of the alignment layer include Gd ₂ Zr ₂ O ₇ , MgO, ZrO ₂ —Y ₂ O ₃ (YSZ), SrTiO ₃ , CeO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , Gd ₂ O ₃ , and Examples thereof include metal oxides such as Zr ₂ O ₃ , Ho ₂ O ₃ and Nd ₂ O ₃ . The alignment layer is preferably formed by an IBAD (Ion-Beam-Assisted Deposition) method.
The cap layer is formed on the surface of the above-mentioned orientation layer, and is made of a material in which crystal grains can be self-oriented in the in-plane direction. Examples of the material of the cap layer include CeO ₂ , Y ₂ O ₃ , Al ₂ O ₃ , Gd ₂ O ₃ , ZrO ₂ , YSZ, Ho ₂ O ₃ , Nd ₂ O ₃ , and LaMnO ₃ .

The oxide superconducting layer 3 is composed of an oxide superconductor. As an oxide superconductor, particularly, but not limited to, for example, the general formula _{REBa 2 Cu 3 O X (RE123} ) with REBa-Cu-O based oxide superconductor represented the like. Examples of the rare earth element RE include one or more of Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu. Among them, one of Y, Gd, Eu, and Sm, or a combination of two or more of these elements is preferable. Generally, X is 7-x (oxygen deficiency amount x: about 0 to 1).
The oxide superconducting layer 3 is formed on the main surface 2a of the intermediate layer 2 (the surface opposite to the base material 1 side).

The first protective layer 4 has a function of bypassing an overcurrent generated at the time of an accident and suppressing a chemical reaction that occurs between the oxide superconducting layer 3 and a layer provided on the first protective layer 4. .. Examples of the material of the first protective layer 4 include silver (Ag), copper (Cu), gold (Au), an alloy of gold and silver, other silver alloys, copper alloys, gold alloys, and the like. The first protective layer 4 covers at least the main surface 3a of the oxide superconducting layer 3 (the surface opposite to the intermediate layer 2 side).

The first protective layer 4 may cover a part or all of a region selected from the side surface of the oxide superconducting layer 3, the side surface of the intermediate layer 2, the side surface of the base material 1, and the back surface. The first protective layer 4 may be composed of two or more kinds or two or more metal layers.

The second protective layer 6 is made of copper, silver, or the like, and integrally covers the outer surface of the superconducting laminated body 5.
The superconducting laminated body 5 and the second protective layer 6 are collectively referred to as a superconducting laminated body 7.

The stabilizing layer 8 is formed so as to cover at least a part of the surface of the superconducting laminated body 7. The stabilizing layer 8 has a function as a bypass portion that commutates an overcurrent generated when the oxide superconducting layer 3 changes to the normal conducting state. Examples of the constituent material of the stabilizing layer 8 include metals such as copper, copper alloys (for example, Cu-Zn alloys, Cu-Ni alloys, etc.), aluminum, aluminum alloys, silver, and the like.
One surface of the superconducting wire 10 is referred to as a first surface 10a. The surface opposite to the first surface 10a is referred to as the second surface 10b.

The superconducting wire 10 shown in FIG. 7 can be manufactured, for example, as follows.
The superconducting laminate 5 is obtained by sequentially forming the intermediate layer 2, the oxide superconducting layer 3, and the first protective layer 4 on the first main surface 1a of the base material 1. Then, the second protective layer 6 is formed on the surface of the superconducting laminated body 5 by a sputtering method or the like to obtain the superconducting laminated body 7. Then, the stabilizing layer 8 is formed by, for example, a plating method (for example, electrolytic plating). The superconducting wire 10 is obtained through the above steps.

[Wire processing equipment]
Next, a processing apparatus capable of carrying out the wire rod processing method of the embodiment will be described.
FIG. 1 is a configuration diagram of a processing apparatus 100 capable of implementing the wire rod processing method of the embodiment. FIG. 2 is a process diagram of a processing method using the processing apparatus 100. FIG. 3 is a perspective view schematically showing the processing apparatus 100.

As shown in FIG. 1, the processing apparatus 100 includes a pair of first rollers 20, 20, a pair of second rollers 30, 30, and a pair of ionizers (static elimination mechanisms) 40, 40.
The first rollers 20 and 20 are arranged in parallel with each other (see FIG. 3 ). The first rollers 20 and 20 sandwich the superconducting wire 10 in the nip. The first rollers 20, 20 are in contact with the first surface 10a and the second surface 10b of the superconducting wire 10, respectively.

The surface (outer peripheral surface 20a) of the first roller 20 has a structure capable of capturing the deposit 50 on the surface (first surface 10a and second surface 10b) of the superconducting wire 10. For example, the first roller 20 has fine irregularities on the outer peripheral surface 20a. The surface roughness Ra (arithmetic mean roughness Ra defined in JIS B0601) of the outer peripheral surface 20a may be, for example, 0.1 to 10 μm.

At least the outer peripheral surface 20a of the first roller 20 may be made of a material that is elastically deformable (for example, rubber such as urethane rubber or silicone rubber). The hardness of the outer peripheral surface 20a (Shore A hardness defined in JIS Z2246) is, for example, 10 to 100. The outer peripheral surface 20a of the first roller 20 preferably has a lower hardness than the outer peripheral surface 30a of the second roller 30.

The outer peripheral surface 20a of the first roller 20 can capture the deposit 50 on the surface of the superconducting wire 10 by the recess. Therefore, the first roller 20 can remove the deposit 50 on the surface of the superconducting wire 10 from the superconducting wire 10. The first roller 20 can remove, for example, the deposit 50 (foreign matter) having an average particle size of 0.1 μm or more from the superconducting wire 10.

The second rollers 30 and 30 are arranged parallel to the first rollers 20 and 20, respectively (see FIG. 3 ). The second rollers 30 and 30 are in contact with the outer peripheral surfaces 20a and 20a of the first rollers 20 and 20, respectively. The second rollers 30, 30 are not in contact with the superconducting wire 10.

The surface (outer peripheral surface 30a) of the second roller 30 has surface tackiness. The outer peripheral surface 30a of the second roller 30 is made of, for example, resin (acrylic resin, silicone resin, etc.), rubber (silicone rubber, urethane rubber, etc.), or the like. Due to the surface adhesiveness, the outer peripheral surface 30a can adhere the deposit 50 on the outer peripheral surface 20a of the first roller 20. Therefore, the second roller 30 can capture the adhered matter 50 on the outer peripheral surface 20 a of the first roller 20 and remove it from the first roller 20.

As shown in FIG. 3, the width W1 of the first roller 20 and the second roller 30 (dimension in the width direction of the superconducting wire 10) is preferably 1.5 times or more the width W of the superconducting wire 10. As a result, even if the position in the width direction of the superconducting wire 10 is displaced, it becomes difficult for the superconducting wire 10 to come out of the contact area of the first roller 20, so that the deposit 50 on the surface of the superconducting wire 10 can be removed. it can. The width W1 of the first roller 20 and the second roller 30 is the dimension of the first roller 20 and the second roller 30 in the central axis direction.

The ionizers 40, 40 are installed downstream of the first rollers 20, 20 in the traveling direction of the superconducting wire 10.
The ionizer 40 includes, for example, a discharge electrode (not shown) and a counter electrode (not shown). The ionizer 40 ionizes the molecules in the air by, for example, corona discharge generated between the discharge electrode and the counter electrode by applying a high voltage.

The pair of ionizers 40 are provided at positions close to the first surface 10a and the second surface 10b of the superconducting wire 10. Therefore, the generated ions can be made to act on the first surface 10a and the second surface 10b of the superconducting wire 10.
The width W2 (dimension in the width direction of the superconducting wire 10) W2 of the ionizer 40 is preferably 1.5 times or more the width W of the superconducting wire 10. As a result, even if the position of the superconducting wire 10 in the width direction is displaced, the superconducting wire 10 is less likely to be out of the working range of the ionizer 40, so that the deposit 50 on the surface of the superconducting wire 10 can be removed.

The ionizer 40 electrically neutralizes the surface of the superconducting wire 10 with ions, weakens the electric adsorption force of the deposit 50, and facilitates the detachment of the deposit 50 from the superconducting wire 10. The ionizer 40 can remove the deposit 50 (foreign matter) having an average particle size of less than 0.1 μm from the superconducting wire 10.
Since the ionizer 40 can remove the deposit 50 of the superconducting wire 10 without contact, there is an advantage that the superconducting wire 10 is less likely to be damaged.

[Processing method of wire rod]
Next, a method of treating the wire rod according to the embodiment will be described.
(First step)
First, the step of removing the deposits from the superconducting wire using the first roller and the second roller will be described. This step is called "first step".

As shown in FIG. 1, the deposit 50 may adhere to the surface (first surface 10a and second surface 10b) of the superconducting wire 10 when the superconducting wire 10 is manufactured. The adhered matter 50 is particles (fine particles) or the like generated when the superconducting wire 10 is manufactured. The superconducting wire 10 has a length of 10 m or more, for example.

The superconducting wire 10 is run in the length direction (rightward in FIG. 1). In order to run the superconducting wire 10, for example, a method of taking up the superconducting wire 10 sent from a sending roller (not shown) by a winding roller (not shown) can be adopted.

The first rollers 20 and 20 are rotated around the central axis in a state of being in contact with the surfaces (first surface 10a and second surface 10b) of the superconducting wire 10 (see arrows). The rotation direction of the first roller 20 is the direction along the traveling direction of the superconducting wire 10 (counterclockwise direction in FIG. 1) at the contact position with the superconducting wire 10. The first roller 20 preferably rotates following the superconducting wire 10.

As described above, the outer peripheral surface 20a of the first roller 20 can capture the deposit 50 on the surface of the superconducting wire 10. For example, at least a part of the adhered matter 50 is fitted into the concave portion of the outer peripheral surface 20a of the first roller 20 and is in a state of being difficult to be detached. Therefore, the first roller 20 can remove at least a part of the deposit 50 on the surface of the superconducting wire 10 and clean the surface of the superconducting wire 10.

When the outer peripheral surface 20a of the first roller 20 is formed of an elastic material such as rubber, it is possible to prevent the surface of the superconducting wire 10 from being damaged and avoid deterioration of the characteristics of the superconducting wire 10.

As shown in FIG. 2, as the first rollers 20 and 20 rotate, the second rollers 30 and 30 are rotated around the central axis while being in contact with the outer peripheral surfaces 20a and 20a of the first rollers 20 and 20 (arrows). reference). The rotation direction of the second rollers 30, 30 is a direction (clockwise direction in FIG. 2) along the rotation direction of the first rollers 20, 20 at the contact position with the first rollers 20, 20. The second roller 30 preferably rotates following the first roller 20.

As described above, since the outer peripheral surface 30a of the second roller 30 has surface adhesiveness, at least a part of the deposit 50 on the surface of the first roller 20 is removed, and the outer peripheral surface 30a of the second roller 30 is transferred. ..

Since the deposit 50 is removed from the first roller 20 by the second roller 30, even if the outer peripheral surface 20a of the first roller 20 circulates and comes into contact with the surface of the superconducting wire 10 again, the superconducting wire 20 is removed from the first roller 20. The transfer of deposits to 10 is unlikely to occur. Further, since the second roller 30 firmly captures the adhering matter 50 due to the surface adhesiveness, the adhering matter 50 is less likely to move from the second roller 30 to the first roller 20.

(Second step)
Next, a process of removing deposits from the superconducting wire by using an ionizer will be described. This step is called "second step".
4 to 6 are explanatory views of the step (second step) of electrically neutralizing the superconducting wire 10 by the ionizer 40. 4 to 6 are views showing a cross section of the superconducting wire rod 10 orthogonal to the length direction.

It is difficult to completely remove the deposit 50 on the superconducting wire 10 by the first roller 20 and the second roller 30 shown in FIG. Therefore, as shown in FIG. 4, on the surfaces (first surface 10a and second surface 10b) of superconducting wire 10, there are cases where adhered matter 50 that cannot be removed by first roller 20 remains. In particular, the deposit 50 having a small size tends to remain.

The superconducting wire 10 passing through the first rollers 20, 20 (see FIGS. 1 and 2) is introduced between the ionizers 40, 40 as shown in FIG. The ionizers 40, 40 cause the ions to act on the surfaces (the first surface 10a and the second surface 10b) of the superconducting wire 10 and electrically neutralize the surfaces. For example, when the surface of the superconducting wire 10 is positively charged, the surface of the superconducting wire 10 can be electrically neutralized by the negative ions 41 supplied from the ionizer 40. Therefore, as shown in FIG. 6, the surface of the superconducting wire 10 has a weak electric attraction force, and the deposit 50 is easily desorbed from the surface of the superconducting wire 10. Thereby, the surface of the superconducting wire 10 can be cleaned.

[Effects Obtained by Processing Method of Embodiment]
In the treatment method of the embodiment, unlike ultrasonic cleaning, water is not used to remove the deposit 50. Therefore, it is possible to prevent the characteristics of superconducting wire 10 from being deteriorated due to chemical changes in the underlayer, the intermediate layer, and the superconducting layer due to the use of water. The treatment method of the embodiment also has an advantage that the treatment operation is easy because water is not used.

In the treatment method of the embodiment, the first roller 20 that rotates with the traveling of the superconducting wire 10 removes the deposits 50 on the superconducting wire 10. Therefore, the force applied to the superconducting wire 10 can be reduced as compared to the method using brushing. Therefore, the superconducting wire 10 is less likely to be damaged. Therefore, it is possible to suppress the deterioration of the characteristics due to the damage of the superconducting wire 10.

In the processing method of the embodiment, the first roller 20 is brought into contact with the superconducting wire 10 to remove the deposit 50. Therefore, the effect of removing the deposit 50 (cleaning) is higher than that of a non-contact cleaning method such as air cleaning. It is excellent in terms of (effect).

According to the processing method of the embodiment, since the deposit 50 on the superconducting wire 10 is removed by the first roller 20, unlike the ultrasonic cleaning using water, the degree of orientation of the intermediate layer or the like of the superconducting wire 10 is improved. You can Therefore, the superconducting wire 10 having uniform characteristics in the longitudinal direction can be obtained. Therefore, in the superconducting wire 10, a local decrease in the critical current value is unlikely to occur. Therefore, the characteristics of the superconducting wire 10 can be improved.
According to the processing method of the embodiment, for example, a long superconducting wire 10 having a length of 10 m or more can be cleaned.

According to the processing method of the embodiment, since the ionizer 40 is used, it is possible to remove the deposit 50 that could not be completely removed by the superconducting wire 10 and further clean the superconducting wire 10. Furthermore, since the surface of the superconducting wire 10 is electrically neutralized, it is possible to make it difficult for foreign matter (such as fine particles) to adhere to the superconducting wire 10.

Although the present invention has been described above based on the preferred embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present invention.
The mechanism by which the first roller captures the deposit on the surface of the superconducting wire is not particularly limited. The first roller may capture the adhered matter of the superconducting wire by electrical adsorption (electrostatic adsorption) or surface adhesiveness, but as shown in the embodiment, it is possible to capture the adhered matter by the fine unevenness. preferable.

The rotation operation of the first roller is not limited to the rotation driven by the superconducting wire, but may be rotation by a driving unit such as a motor. The form of the rotation operation of the second roller is not limited to the rotation driven by the first roller, but may be rotation by a driving unit such as a motor.
The method for treating a superconducting wire according to the embodiment is one step in manufacturing the superconducting wire, and thus can be said to be an embodiment of a “method for manufacturing a superconducting wire”.

As the processing target of the processing method of the embodiment, the superconducting wire having the structure shown in FIG. 7 has been described, but the processing target is not limited to this. 8 to 11 are schematic views showing a structural example of a wire rod to be processed. As shown in FIG. 8, the processing target may be the first structure (wire 10A) in which the base material 1 and the intermediate layer 2 are laminated. As shown in FIG. 9, the processing target may be a second structure (wire 10B) in which a base material 1, an intermediate layer 2, and an oxide superconducting layer 3 are laminated in this order. As shown in FIG. 10, the treatment target may be a third structure (a wire rod 10C) in which a base material 1, an intermediate layer 2, an oxide superconducting layer 3, and a first protective layer 4 are laminated in this order. .. As shown in FIG. 11, the processing target may be a fourth structure (wire 10D) in which the second protective layer 6 is provided on the outer surface of the wire 10C (see FIG. 10). The superconducting wire 10 shown in FIG. 7 is the fifth structure.

10... Superconducting wire (wire), 10A to 10D... Wire, 10a... First surface (surface of superconducting wire), 10b... Second surface (surface of superconducting wire), 20... First roller, 20a... Outer peripheral surface (first) 1 roller surface), 30...second roller, 30a...outer peripheral surface (second roller surface), 40...ionizer, 50...adhesion, W...width of superconducting wire, W1...width of first roller.

Claims (4)

A method for treating a wire rod, comprising: rotating a first roller in contact with the wire rod; and rotating a second roller having surface adhesiveness in contact with the surface of the first roller. The method for treating a wire rod according to claim 1, wherein the surface of the first roller has irregularities capable of capturing an adhering substance on the surface of the wire rod. The method for treating a wire rod according to claim 1, wherein the surface of the wire rod that has passed through the first roller is electrically neutralized. The wire rod processing method according to claim 1, wherein the first roller has a widthwise dimension of the wire rod that is 1.5 times or more the width of the wire rod.

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