JP2002167617A - Roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remove thermal stress developed on a roll with a simple structure when a wire rod is conveyed. SOLUTION: This roll 1 is composed of a rotating shaft 4, a metal-made first sleeve 2 fitted to this rotating shaft 4 and a ceramic-made secondary sleeve 3 fitted outward to this first sleeve 2. On the above rotating shaft 4, an impeller 5 is fitted to at least one side surface side of the first sleeve 2 and the second sleeve 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll used in a high-temperature atmosphere, and more particularly to a roll used in an annealing process or a hot rolling process of a drawn wire.

[0002]

2. Description of the Related Art Conventionally, wires and bars made of metals such as iron, copper and iron alloys are generally drawn by a rolling and drawing process, and then annealed while guiding the wires with a plurality of rolls. It is manufactured through a process of annealing.

As shown in FIG. 4, a ceramic sleeve 11 made of an aluminum oxide sintered body, a zirconium oxide sintered body or the like having excellent wear resistance and strength is mounted on a metal rotating shaft 12 as shown in FIG. When the roll is used in a high-temperature atmosphere, the roll is caused by a difference in thermal expansion coefficient between the rotating shaft 12 made of metal and the sleeve 11 provided on the rotating shaft 12. Thermal stress occurs,
In order to prevent the sleeve 11 from being damaged by the thermal stress, a flow path 13 through which cooling water flows is provided inside the rotating shaft 12, and a cushioning material 14 is provided between the rotating shaft 12 and the sleeve 11. I have.

In the roll, a wire is transported on the outer peripheral surface of the sleeve 11 as the roll rotates. Thermal stress generated between the rotary shaft 12 and the sleeve 11 passes through the flow path 13. Rotating shaft 12 and sleeve 1 with cooling water
1 is cooled by cooling, and the small thermal stress is absorbed by the cushioning material 14 and the sleeve 11 is cooled.
It is designed not to cause breakage.

[0005]

However, the conventional roll requires a special seal structure at a portion where the flow path 13 is attached in order to prevent a cooling medium such as cooling water from leaking from the flow path 13. Have the drawbacks of being complicated, lacking mass productivity, and increasing production costs.

When the wire is annealed, an electric current may flow through the wire itself, but when a cooling medium such as cooling water is leaking, the leaked cooling medium comes into contact with the wire to cause an electric leakage. However, there was a risk that a predetermined annealing process could not be performed.

SUMMARY OF THE INVENTION The present invention has been devised in view of the above-mentioned drawbacks, and has as its object to effectively remove thermal stress generated between a rotating shaft of a roll and a ceramic sleeve by a simple structure and to reduce the thermal stress. Another object of the present invention is to provide a roll capable of effectively preventing the sleeve from being damaged and capable of reliably performing an annealing process on the wire.

[0008]

SUMMARY OF THE INVENTION The present invention provides a roll comprising a rotating shaft, a first metal sleeve mounted on the rotating shaft, and a second ceramic sleeve mounted on the first sleeve. Wherein an impeller is attached to at least one end face side of the first sleeve and the second sleeve on the rotation shaft.

Further, the present invention is characterized in that the outer peripheral surface of the second sleeve has an arithmetic average roughness (Ra) of 0.4 μm to 1 μm.

According to the roll of the present invention, since the impeller is attached to the rotating shaft located on one end surface side of the first sleeve and the second sleeve, when the roll is rotated to transport the wire, Air is fed between the rotating shaft and the first sleeve by the rotation of the impeller accompanying the rotation, and the sent air causes the rotating shaft, the first sleeve, and the second sleeve to rotate.
The sleeve is cooled well, and no large thermal stress is generated between the rotating shaft and the first sleeve and between the first sleeve and the second sleeve. As a result, the ceramic second sleeve is broken. Etc. are effectively prevented from occurring,
The wire can be satisfactorily transported over a long period of time.

Further, according to the roll of the present invention, the rotating shaft,
The cooling of the first sleeve and the second sleeve is performed by sending air from the impeller, the structure of the impeller and the attachment of the impeller to the rotating shaft are extremely simple, and the roll as a product is rich in mass productivity and manufactured. The cost can be reduced and the cost can be reduced.

Further, according to the roll of the present invention, the rotating shaft,
The cooling of the first sleeve and the second sleeve is performed by sending air from the impeller, and no cooling medium such as cooling water is used at all. As a result, when the wire is annealed by applying a current to the wire, A predetermined annealing treatment can be performed on the wire without causing leakage due to contact with a cooling medium such as cooling water.

Still further, according to the roll of the present invention, the second
The outer peripheral surface of the sleeve is 0.4 μm in arithmetic average roughness (Ra)
By setting the thickness in the range of 1 μm to 1 μm, it is possible to effectively prevent the wire from coming into smooth contact with the surface of the roll, causing damage to the wire and making it difficult to convey the wire by sliding on the surface of the roll.

[0014]

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

FIG. 1A is a perspective view showing an embodiment of the roll according to the present invention, and FIG. 1B is a sectional view taken along line XX of FIG.
It is a line sectional view.

As shown in FIGS. 1 (a) and 1 (b), the roll of the present invention comprises a rotating shaft 4, a first metal sleeve 2 mounted on the rotating shaft 4, and a first sleeve 2. It comprises an outer ceramic second sleeve 3 and an impeller 5 arranged on the end face side of the first sleeve 2 and the second sleeve 3.

The rotary shaft 4 rotates the roll 1 and acts as a central axis of an impeller 5 to be described later, and is made of a metal such as carbon steel, alloy steel, and stainless steel. It is produced by processing.

A first sleeve 2 is mounted on the outer periphery of the rotating shaft 4, and the first sleeve 2 functions as a core material of a second sleeve 3 made of ceramic, which will be described later. It is made of a high-strength steel material such as carbon steel, alloy steel, stainless steel, heat-resistant steel, and superalloy. For example, it is manufactured by cutting a steel material made of carbon steel or the like into a predetermined shape.

A certain space is formed between the surface of the rotary shaft 4 and the inner surface of the first sleeve 2, and air is blown into the space as the impeller 5 described later rotates. It is supposed to be.

Further, a second sleeve 3 is provided on the first sleeve 2, and the second sleeve 3 is
In order to increase the mechanical strength and abrasion resistance of the wire and to allow the wire to be used for a long period of time, and when the wire is annealed by passing a current, the wire is conveyed on the outer peripheral surface of the second sleeve 3. In order to provide electrical insulation between the wire and the wire, the wire is made of ceramics such as an aluminum oxide sintered body, a zirconium oxide sintered body, a silicon carbide sintered body, and a silicon nitride sintered body.

When the second sleeve 3 is made of an aluminum oxide sintered body, for example, aluminum oxide (Al 2 O 3) is added in an amount of 90 to 99.9% by weight.
Silicon oxide (SiO2), magnesium oxide (MgO), and calcium oxide (CaO) are used as a sintering aid in a total amount of 0.1.
After adding and mixing 1% by weight to 10% by weight and shaping into a desired shape, in an air atmosphere or a vacuum atmosphere at 1500 ° C.
To 1800 ° C. or 93 wt% to 99 wt% of aluminum oxide (Al 2 O 3), yttrium oxide (Y 2 O 3), magnesium oxide (Mg
O), calcium oxide (CaO), cerium oxide (Ce)
O2) or other stabilized or partially stabilized zirconium oxide is added in an amount of 1% by weight to 7% by weight, and the well-known CIP molding method (cold isostatic press molding method) and uniaxial pressure molding method Molded into a predetermined shape by extrusion molding, injection molding, or the like, and then fired at a temperature of 1500 to 1700 ° C. in an air atmosphere, a hydrogen atmosphere, or a nitrogen atmosphere, or aluminum oxide (Al 2 O 3) 60
4 to 80% by weight of titanium carbide (TiC)
After adding 0% by weight to 20% by weight and forming into a predetermined shape by the same forming method as described above, firing is performed at a temperature of 1300 ° C. to 2000 ° C. in an air atmosphere or a reduced pressure atmosphere, and the surface is polished with a diamond tool. It is manufactured by subjecting to grinding.

When the second sleeve 3 is formed of a ceramic such as an aluminum oxide sintered body, the hardness of the ceramic can be as high as Vickers hardness (Hv1) of 1000 or more, and it can be bent at three points. Flexural strength 1
47 MPa to 1765 MPa, fracture toughness value (K1c) 3
With high strength and high toughness of MPa · m1 / 2 to 7 MPa · m1 / 2, the Young's modulus becomes 10 GPa or more,
The mechanical strength and abrasion resistance of the roller 1 are strengthened, so that the roller 1 can be used for a long time.

It is preferable that the outer peripheral surface of the second sleeve 3 has an arithmetic mean roughness (Ra) in the range of 0.4 μm to 1 μm. This outer peripheral surface is defined by the arithmetic average roughness (R
If a) is less than 0.4 μm, the wire is
When the arithmetic average roughness (Ra) exceeds 1 μm, the surface of the wire is easily scratched. Therefore, if the outer peripheral surface of the second sleeve 3 is set to the arithmetic mean roughness (Ra) in the range of 0.4 μm to 1 μm, the wire rod smoothly slides on the outer peripheral surface of the second sleeve 3 with the rotation of the roll 1. You can touch.

Further, the second sleeve 3 is fitted around the outer periphery of the first sleeve 2, and is arranged so that both ends of the first sleeve 2 are flanged so as to sandwich the second sleeve 3.

Further, between the flange provided on the first sleeve 2 and the second sleeve 3, a cushioning material such as a leaf spring, a spring washer, and a heat-resistant resin packing is interposed, so that the roll 1 Even when heat is applied during use and the first sleeve 2 thermally expands, the dimensional change can be absorbed.

A pair of impellers 5 are attached to the rotary shaft 4 at positions on both end sides of the first sleeve 2 and the second sleeve 3, and the impellers 5 are provided inside the first sleeve 2. To cool the rotary shaft 4, the first sleeve 2 and the second sleeve 3.

The impeller 5 is made of a metal such as carbon steel, alloy steel, and stainless steel, and is manufactured by punching or cutting these steel materials into a predetermined shape.

As shown in FIG. 1, the impeller 5 is welded to the end surfaces of the first sleeve 2 and the second sleeve 3 by the rotating shaft 4.

The impeller 5 functions as long as the number of blades is two or more. Preferably, three or more blades are arranged at equal intervals, and the impeller 5 is placed in the first sleeve 2 when the roll 1 rotates. It is important to mount the roll 1 so that air flows in one direction, so that the strength of the roll 1 itself can be increased and air can be sufficiently fed into the first sleeve 2.

When the roll 1 is rotated to convey the wire rod, the impeller 5 rotates about the rotation shaft 4 with the rotation of the roll 1, and the rotation shaft 4 and the first sleeve 2 are rotated. Is supplied between the rotating shaft 4, the first sleeve 2, and the second sleeve 3.
Is sufficiently cooled, and no large thermal stress is generated between the rotary shaft 4 and the first sleeve 2 and between the first sleeve 2 and the second sleeve 3. As a result, the second sleeve 3 is damaged. Is effectively prevented from occurring, and the wire can be satisfactorily transported over a long period of time.

Next, the step of annealing the wire using the above-mentioned roll 1 will be described with reference to FIG.

For example, a wire drawn with a Cu wire has undergone work hardening, so that it is not possible to proceed directly to the next drawing step. Therefore, it is necessary to soften and temper the wire by annealing. The apparatus for this annealing treatment includes a wire feeding drum 6, a winding drum 9, and a pair of rolls 1 disposed between the wire feeding drum 6 and the winding drum 9.
And a current-carrying terminal 8a disposed between the pair of rolls 1
And 8b, and the wire 7 wound around the wire feeding drum 6 is rolled on one roll 1 and a pair of conducting terminals 8a, 8b.
b, the sheet is sequentially conveyed on the other roll 1 and finally wound around the winding drum 9.

The wire 7 wound around the wire feeding drum 6
While being conveyed onto the pair of rolls 1, they contact the pair of energizing terminals 8 a and 8 b in the middle thereof, and
b, a current flows through the wire 7 located between the wires 7 and b.
Annealing is performed by causing heat to be generated at about 500 ° C. to 600 ° C. by the resistance possessed by the above.

The roll 1 is rotated about a rotating shaft 4 by a motor or the like.
The rotation may be performed by a frictional force between the wire and the outer peripheral surface of the roll 1.

In this case, a current is directly applied to the wire 7,
The method of annealing by generating heat by electric resistance has been described. The method of directly charging the wire 7 wound on the winding drum 9 into a furnace for annealing (batch furnace method), or maintaining the temperature at a high temperature. There is a method of passing through a tank and performing an annealing treatment.

The roll 1 of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the gist of the present invention. Although the wheel 5 is attached to both end surfaces of the first sleeve 2 by the rotating shaft 4, it may be arranged only on one end surface side of the first sleeve 2. Further, a cushioning material made of resin or the like may be arranged between the first sleeve 2 and the second sleeve 3. In this case, the small thermal stress generated between the first sleeve 2 and the second sleeve 3 is absorbed by the cushioning material, and the prevention of breakage of the second sleeve 3 and the like can be made more effective.

[0037]

Next, embodiments of the present invention will be described below. Embodiment 1 First, as shown in FIG. 1, a first sleeve made of stainless steel is provided at a fixed interval on a rotating shaft made of stainless steel, and an aluminum oxide sintered body and Second zirconium oxide sintered body
A roll sample (No. 1) was provided with an impeller comprising four blades on both ends or one end face (air inlet side) of the first sleeve on the rotating shaft with the rotating shaft.
1) to 4) are prepared.

As a comparative example, the first sleeve was made of stainless steel and the second sleeve was made of an aluminum oxide sintered body and a zirconium oxide sintered body, respectively, as in the above. The sample (No.
5, 6) were prepared.

The diameter of the rotating shaft is 25 mm, the outer diameter of the roll is 150 mm, and the length in the longitudinal direction is 300 mm.

Each of the roll samples was used in an annealing process as shown in FIG.
After warming in the range of ° C. and using continuously for one hour, the surface temperature of the inner surface of the first sleeve was measured with a contact thermometer, and the average temperature was determined.

Table 1 shows the results.

[0042]

[Table 1]

As is clear from Table 1, in the samples (Nos. 1 to 4) in which the impellers were attached to both end faces or one end face side of the first sleeve, the surface temperature of the inner surface of the first sleeve was 70 to 70. While the temperature was 79 ° C., the samples (Nos. 5 and 6) without the impeller had surface temperatures of 154 to 168.
° C, the temperature was about twice as high as that of the sample with the impeller attached, and it was found that cracks occurred in the second sleeve due to the thermal expansion of the first sleeve.

[0044]

According to the roll of the present invention, since the impeller is attached to the rotating shaft located on one end surface side of the first sleeve and the second sleeve, when the roll is rotated to transport the wire, Air is fed between the rotating shaft and the first sleeve by the rotation of the impeller accompanying the rotation of the roll, and the sent air causes the rotating shaft, the first sleeve, and the second sleeve to rotate.
The sleeve is cooled well and no large thermal stress is generated between the rotating shaft and the first sleeve and between the first sleeve and the second sleeve. As a result, the ceramic second sleeve may be damaged. Is effectively prevented from occurring,
The wire can be satisfactorily transported over a long period of time.

According to the roll of the present invention, the rotating shaft,
Cooling of the first sleeve and the second sleeve is performed by sending air from the impeller, and the structure of the impeller and the mounting of the impeller on the rotating shaft are extremely simple. The cost can be reduced and the cost can be reduced.

Further, according to the roll of the present invention, the rotating shaft,
The cooling of the first sleeve and the second sleeve is performed by sending air from the impeller, and no cooling medium such as cooling water is used at all. As a result, when current is applied to the wire to perform annealing, A predetermined annealing treatment can be performed on the wire without causing leakage due to contact with a cooling medium such as cooling water.

Furthermore, according to the roll of the present invention, the second
The outer peripheral surface of the sleeve is 0.4 μm in arithmetic average roughness (Ra)
By setting the thickness in the range of 1 μm to 1 μm, it is possible to effectively prevent the wire from coming into smooth contact with the surface of the roll, causing damage to the wire and making it difficult to convey the wire by sliding on the surface of the roll.

[Brief description of the drawings]

FIG. 1A is a perspective view showing an embodiment of the roll of the present invention, and FIG. 1B is a sectional view taken along line XX of FIG. 1A.

FIG. 2 is a schematic view showing an annealing process using the roll of the present invention.

FIG. 3 is a cross-sectional view showing one embodiment of a conventional roll.

[Explanation of symbols]

 1: Roll 2: First sleeve 3: Second sleeve 4: Rotary shaft 5: Impeller 6: Wire feed drum 7: Wire rod 8a, 8b: Power supply terminal 9: Winding drum 11: Sleeve 12: Rotary shaft 13: Flow Road 14: cushioning material

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[Procedure amendment]

[Submission date] December 18, 2000 (200.12.
18)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0003

[Correction method] Change

[Correction contents]

As shown in FIG. 3, a ceramic sleeve 11 made of a sintered body of aluminum oxide, zirconium oxide or the like having excellent wear resistance and strength is provided on a rotating shaft 12 made of metal as shown in FIG. When the roll is used in a high-temperature atmosphere, the roll is caused by a difference in thermal expansion coefficient between the rotating shaft 12 made of metal and the sleeve 11 provided on the rotating shaft 12. Thermal stress occurs,
In order to prevent the sleeve 11 from being damaged by the thermal stress, a flow path 13 through which cooling water flows is provided inside the rotating shaft 12, and a cushioning material 14 is provided between the rotating shaft 12 and the sleeve 11. I have.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction contents]

When the second sleeve 3 is made of an aluminum oxide sintered body, for example, aluminum oxide (Al ₂ O ₃ ) is oxidized as a sintering aid to 90 wt% to 99.9 wt%. Silicon (SiO ₂ ), magnesium oxide (MgO), and calcium oxide (CaO) are 0.1% in total.
After adding and mixing by weight and forming into a desired shape, a temperature of 1500 ° C.
With respect to what was fired at a temperature of 1800 ° C. and 93 to 99% by weight of aluminum oxide (Al ₂ O ₃ ), yttrium oxide (Y ₂ O ₃ ), magnesium oxide (MgO), calcium oxide (CaO), oxide A known CIP is prepared by adding 1% by weight to 7% by weight of zirconium oxide stabilized or partially stabilized with a stabilizer such as cerium (CeO ₂ ).
Molding method (cold isostatic press molding method), uniaxial pressure molding method,
After being formed into a predetermined shape by an extrusion molding method, an injection molding method, or the like, fired at a temperature of 1500 ° C. to 1700 ° C. in an air atmosphere or a hydrogen atmosphere or a nitrogen atmosphere,
Alternatively aluminum oxide (Al ₂ O ₃₎ 60% to 8
0% by weight of titanium carbide (TiC) is 40% by weight or more.
After adding 20% by weight and shaping into a predetermined shape by the same shaping method as described above, firing at a temperature of 1300 ° C. to 2000 ° C. in an air atmosphere or a reduced pressure atmosphere, and grinding the surface with a diamond tool. It is produced by applying.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0022

[Correction method] Change

[Correction contents]

When the second sleeve 3 is formed of a ceramic such as an aluminum oxide sintered body, the hardness of the ceramic can be as high as Vickers hardness (Hv1) of 1000 or more, and it can be bent at three points. Flexural strength 1
47MPa-1765MPa, fracture toughness (K _IC ) 3M
High strength and high toughness of Pa · √m to 7MPa · √m and a Young's modulus of 10 GPa or more
The mechanical strength and abrasion resistance of the material can be enhanced to enable long-term use.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction contents]

Next, the step of annealing the wire using the above-mentioned roll 1 will be described with reference to FIG.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction contents]

Each of the roll samples was used in an annealing process as shown in FIG.
After warming in the range of ° C. and using continuously for one hour, the surface temperature of the inner surface of the first sleeve was measured with a contact thermometer, and the average temperature was determined.

Claims (2)

[Claims] 1. A roll comprising a rotating shaft, a first metal sleeve mounted on the rotating shaft, and a second ceramic sleeve mounted on the first sleeve. A roll, wherein an impeller is attached to at least one end surface of the first sleeve and the second sleeve. 2. The roll according to claim 1, wherein the outer peripheral surface of the second sleeve has an arithmetic average roughness (Ra) of 0.4 μm to 1 μm.