JP2002001405A - Method for grinding rolling roll and cold rolling method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for grinding rolling roll capable of uniformly and efficiently grinding a rolling roll made of an extra-hard metal and to provide a cold rolling method capable of producing a highly glossy cold rolled steel plate excellent in uniformity in appearance. SOLUTION: A grinding method which brings a grinding work surface of the grind stone into contact with the rolling roll by intersecting a revolving shaft of the grinding stone and the rolling roll, using a cup-like grind stone, and a cold rolling method which performs cold rolling by incorporating the rolling roll grinded by this grinding method into at least one rolling stand among a plurality of rolling stands.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polishing method and a cold rolling method for a roll made of cemented carbide, and more particularly to a polishing method and a tandem roll suitable for cold rolling a high gloss stainless steel sheet. The present invention relates to a method for cold rolling a high gloss stainless steel sheet in a mill.

[0002]

2. Description of the Related Art As a method for producing a cold rolled high gloss stainless steel sheet, for example, at least one of a plurality of rolling stands of a tandem mill described in JP-A-8-39103 is used. There is known a cold rolling method in which a hot-rolled steel sheet is cold-rolled by incorporating a roll made of a hard alloy.

[0003] The steel strip after the cold rolling is generally subjected to post-treatments such as finish annealing, pickling, and temper rolling, to give a stainless cold-rolled steel sheet. Conventionally, the polishing of a roll made of cemented carbide is performed by using a method shown in FIGS.
The disk-shaped diamond grinding wheel 100 shown in FIG. The disc-shaped diamond grindstone 100 is provided with a ring-shaped abrasive layer 112 holding diamond abrasive grains with a binder on the outer peripheral surface of a disc-shaped grindstone pedestal 111, and using the outer peripheral surface of the grindstone as a polishing work surface. .

In the conventional method of polishing a roll made of cemented carbide, the grinding wheel shaft hole of the grinding wheel 100 is mounted on a grinding wheel rotating shaft 101 of a grinding machine (not shown), and the grinding wheel 100 is rotated around the grinding wheel rotating shaft 101. The rolling roll 200 is polished on the outer peripheral surface of the grindstone 100 by being brought into contact with the rolled cemented carbide rolling roll 200 while being moved while moving along the roll axis 201.

[0005] In the method of polishing a roll made of cemented carbide on the outer peripheral surface of a disk-shaped diamond grindstone, if the degree of bonding of the grindstone is reduced, abrasive grains fall off remarkably, and the surface appearance changes along the roll axis direction. Polishing unevenness is likely to occur,
Since the roughness of the roll cannot be set to a desired value, the degree of bonding of the diamond wheel must be increased. However, in the method of polishing a cemented carbide rolling roll on the outer peripheral surface of a diamond grindstone, when the degree of bonding of the abrasive grain layer is increased, a problem called "hitting" in which the grindstone bounces occurs, and a feed mark caused by this occurs. Therefore, there has been a problem that the moving speed of the grindstone must be slowed down and the polishing efficiency is low.

[0006] When the roll having the uneven polishing is incorporated into a rolling stand of a tandem mill and cold-rolled on a hot-rolled stainless steel sheet, the uneven polishing is transferred to the surface of the steel sheet.
Thereafter, when post-treatments such as finish annealing, pickling, and temper rolling are performed to obtain a cold-rolled steel sheet, there is a problem that uniformity in appearance is reduced even if gloss is improved.

[0007]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems of the prior art, and a roll capable of uniformly and efficiently polishing a cemented carbide roll. It is an object of the present invention to provide a cold rolling method capable of obtaining a high gloss cold-rolled steel sheet excellent in polishing method and appearance uniformity.

[0008]

Means for Solving the Problems The present inventors use a cup-shaped grindstone and make the positional relationship and the contact state between the grindstone and the roll appropriate to change the surface appearance along the roll axis direction. The present invention has been completed by finding that a roll of cemented carbide can be uniformly and efficiently polished without causing polishing unevenness due to a polishing unevenness or a defect called "hitting".

That is, the present invention relates to a polishing method for polishing a rolling roll by rotating a rolling roll made of cemented carbide and bringing the grinding wheel into contact with the rolling roll while rotating and moving the roll along the roll axis. A method for polishing a roll, wherein a cup-shaped grindstone is used as the grindstone, and a grinding work surface of the grindstone is brought into contact with the roll while crossing the grindstone rotation axis and the roll axis.

[0010] In a polishing method for rotating a cemented carbide rolling roll, rotating a grinding wheel in contact with the rolling roll and moving it along the roll axis, the polishing roll is polished. Using a cup-shaped grindstone, the grinding work surface of the grindstone is brought into contact with the rolling roll along a straight line on the grinding work surface of the grindstone, which intersects the grinding wheel rotation axis and is parallel to the roll axis. This is a method of polishing a roll.

[0011] A roll roll polished by the roll roll polishing method according to claim 1 or 2 is incorporated into at least one of a plurality of roll stands to perform cold rolling. Cold rolling method.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, the causes of uneven polishing and the uniformity of appearance of a cold-rolled steel sheet during the polishing of a roll made of cemented carbide will be described. Polishing unevenness during roll polishing includes linear unevenness called a feed mark and wear unevenness whose surface appearance changes along the roll axis direction.

The feed mark is a pattern which is slightly inclined with respect to the circumferential direction in accordance with the rotation of the roll and the feed of the grindstone, and has a pattern at a constant cycle. It is caused by a defect called. Wear unevenness is caused by the extremely high hardness of the rolling roll made of a hard metal, and when the degree of bonding of the diamond grindstone is lowered, the abrasive grains fall off remarkably, and the grinding work of the grindstone while moving the grindstone in the roll axis direction This is due to a significant change in the surface. Wear unevenness tends to occur when the diameter is large and the polished area is large.

Next, a description will be given of the occurrence of unevenness in appearance when a roll of a cemented carbide having uneven polishing is incorporated into a rolling stand of a tandem mill and subjected to cold rolling. When rolling with a cemented carbide rolling roll, the bite angle becomes larger than that of a steel roll, the amount of oil introduced into the roll bite decreases, and micro defects on the steel sheet surface can be crushed by the roll. As a result, the surface of the steel sheet can be smoothed, and a glossy surface can be obtained. However, when there is polishing unevenness on the roll surface, the roughness profile of the roll surface changes correspondingly, so that the polishing unevenness is transferred to the steel sheet, resulting in unevenness in the appearance of the steel sheet surface and loss of uniformity. It is.

[0015] From the above-mentioned causes of the occurrence of the polishing unevenness of the cemented carbide rolling roll, one of the polishing unevennesses can be solved by increasing the degree of bonding of the diamond grindstone and the other feed mark. Was solved by preventing the occurrence of a problem called "hitting" by using a cup-shaped grinding wheel shown in FIGS. 1 (a) and 1 (b) and limiting the contact state between the grinding wheel and the rolling roll. .

[0016] The cup-shaped grindstone has been generally used for mirror-finishing the surface of a steel rolling roll.
In the polishing method in this case, for example, with a grinding wheel of about 1000th, the abrasive grains are also polished using an alumina-based material such as alumina zirconia, so a milling roll made of cemented carbide is used in this method. However, it was not possible to polish uniformly and efficiently.

Further, from the relationship between the polishing unevenness of the rolling roll in cold rolling and the unevenness in appearance of the cold-rolled steel sheet, the unevenness in appearance of the cold-rolled steel sheet is determined by a uniform hard metal alloy without polishing unevenness. The problem was solved by performing cold rolling with rolls. Hereinafter, the method for polishing a rolling roll of the present invention will be described in detail with reference to FIGS.

First, a cup-shaped grindstone used in the roll polishing method of the present invention will be described with reference to FIGS. 1 (a) and 1 (b). 1A and 1B are a cross-sectional view and a bottom view showing the structure of a cup-shaped grindstone used in the polishing method of the present invention. In the figure, 1 is a grindstone, 11 is a grindstone pedestal, 12 is an abrasive layer, 1A is a grindstone rotating shaft, and 1B is a polishing work surface.

As shown in FIG. 1A, a cup-shaped grindstone 1 is a disc-shaped grindstone pedestal provided with a shaft to be attached to a polishing machine.
11 and a ring-shaped abrasive layer 12 holding diamond abrasive grains with a binder. The abrasive layer 12 is provided on the surface of the grinding wheel pedestal 11 opposite to the surface on which the shaft is provided. The reason why the diamond wheel is used is to grind a roll made of cemented carbide. Then, as shown in FIG. 1B, a ring-shaped polishing work surface 1B
Are formed perpendicular to the grinding wheel rotation axis 1A.

Since the cup-shaped grindstone 1 has a structure as shown in FIG. 1 (a), it can be used as a conventional grindstone as shown in FIG. The amount of elastic deformation of the grindstone gantry is larger than that of the gantry, and the roll and the grindstone come into contact with each other more uniformly than the conventional grindstone, so that amplification of vibration can be suppressed. Because it was in a contact state with the rolling roll 2, it can be polished stably.
Can be improved, and the moving speed of the grinding wheel in the axial direction can be increased.

FIG. 2 shows the roll polishing method of the present invention.
(A) to FIG. 2 (c), FIG. 3, and FIG. 4 (a), FIG.
This will be described with reference to FIG. 2 (a), 2 (b), and 2 (c) are a plan view, a cross-sectional view along XX, and a cross-sectional view along YY showing a contact state between a grindstone and a roll during polishing. FIG. 3 is a ZZ of FIG. 2B showing a contact portion on the grindstone side during roll polishing.
It is an arrow view.

FIGS. 4 (a) and 4 (b) are cross-sectional views showing another state of contact between the grindstone and the roll during polishing, and Z'-
It is a Z 'arrow view. 1 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, 1C is a grinding wheel rotation direction, 1D is a grinding wheel moving direction, and 1E is a straight line on the polishing work surface 1B that intersects the grinding wheel rotation axis and is parallel to the roll axis.

Reference numeral 2 denotes a roll, 2A denotes a roll shaft, 2B denotes a roll body, 2C denotes a roll rotation direction, 3A denotes a gap, and 3L and 3R denote contact surfaces between the grindstone and the roll. In the polishing method of the present invention, the roll 2 is rotated, and the diamond whetstone 1 is brought into contact with the roll 2 while rotating and moved along the roll axis 2A.
Is polished. The material of the body 2B of the rolling roll is a cemented carbide.

At this time, a cup-shaped grindstone 1 was used, and FIG.
(A), FIG. 2 (b), FIG. 2 (c), or FIG.
As shown in FIG. 4B, the grinding wheel rotating shaft 1A intersects with the roll shaft 2A, and the polishing work surface 1B is brought into contact with the rolling roll 2. As shown in FIG. 2 (b), when the grinding wheel rotating shaft 1A and the roll shaft 2A intersect at a right angle, and the polishing work surface 1B is brought into contact with the rolling roll 2, the roll peripheral surface is straight or curved substantially parallel to the roll shaft 2A. In the case of being formed by the rotating surface of, that is, when polishing a roll with a small crown,
As shown in FIG. 3, the grinding wheel rotation axis 1A intersects and the roll axis
The polishing work surface 1B is in contact with the rolling roll 2 along a straight line 1E on the polishing work surface 1B parallel to 2A. Both 3L and 3R in the drawing are the contact surfaces between the grindstone 2 and the roll 2.

In the polishing method of the present invention, the grinding wheel and the rolling roll are in contact with each other along the straight line 1E on the polishing work surface 1B which intersects with the grinding wheel rotation axis 1A and is parallel to the roll axis 2A. It is now possible to polish. Further, as shown in FIG. 4 (a), the grinding wheel rotating shaft 1A and the roll shaft
When the polishing work surface 1B is brought into contact with the roll 2 as shown in FIG. 4 (b), when the roll having a small crown is polished, as shown in FIG. The polishing work surface 1B is in contact with the rolling roll 2 along the straight line 1E on the parallel polishing work surface 1B, and only 3L in the drawing is the contact surface between the grindstone 2 and the roll 2. In this case, as shown in FIG. 4A, a gap 3A is formed between the polishing work surface 1B and the roll 2 along a straight line 1E opposite to 3L with respect to the intersection with the grinding wheel rotating shaft 1A.

According to the polishing method of the present invention, even in such a contact state, the grinding wheel and the rolling mill roll along the straight line 1E on the polishing work surface 1B crossing the grinding wheel rotation axis 1A and parallel to the roll axis 2A. As a result, the polishing can be stably performed. The direction of the grinding wheel peripheral speed VG vector on the contact surfaces 3L and 3R between the grinding wheel 2 and the roll 2 substantially coincides with the roll circumferential direction as shown in FIGS. 3 and 4B. When the absolute value of the grinding wheel peripheral speed VG vector is made larger than the absolute values of the roll peripheral speed vector and the grinding wheel moving speed vector, polishing can be performed while giving a polishing line substantially parallel to the roll circumferential direction.

In the above description, a case where a roll having a small crown is polished has been described. However, when a roll having a large crown is polished, if the grindstone rotating shaft 1A and the roll shaft 2A intersect at right angles, the grindstone is polished. Since the polishing surface 1B and the roll 2 are in contact with each other along one straight line 1E across the intersection with the rotating shaft 1A, it is possible to stably grind, while the grinding wheel rotating shaft 1A and the roll shaft 2A When crossed diagonally,
Since the polishing work surface 1B and the roll 2 are in contact with each other along the straight line 1E on both sides of the intersection with the grinding wheel rotation shaft 1A, the polishing can be stably performed.

Therefore, in the polishing method of the present invention, the roll 2
Focusing on the contact state between the grinding wheel 1 and the polishing work surface 1B, regardless of the crown of the roll 2, along the straight line 1E on the polishing work surface 1B that intersects the grinding wheel rotation axis 1A and is parallel to the roll axis 2A. ,
If the polishing work surface 1B is brought into contact with the rolling roll 2 and polished,
The occurrence of "battering" of the whetstone is suppressed, and polishing can be stably performed.

Here, when the grindstone 1 and the roll 2 are brought into contact with the contact surfaces 3L and 3R along the straight line 1E on both sides of the intersection with the grindstone rotation axis 1A, the grindstone 1 is moved in the direction of the roll axis 2A in the direction of the roll axis 2A. When the contact surfaces 3L and 3R are polished, they are polished on the contact surfaces 3L and 3R, which is effective for giving a relatively coarse roughness. Also, the grinding wheel rotation axis
When the grinding wheel 1 is moved only once in the direction of the roll axis 2A when the grinding wheel 1 is moved once in the direction of the roll axis 2A, the roll 2 is polished only at the contact surface 3L when the contact surface 3L is in contact with only one straight line 1E across the intersection with 1A. This is effective for providing a relatively fine roughness.

In the method of polishing a roll according to the present invention, if the moving speed of the grindstone is reduced within a range that does not lower the polishing efficiency, the same portion on the roll surface is polished several times, so that the polishing unevenness becomes less noticeable. it can. Further, the particle size of the grindstone used in the roll polishing method of the present invention can be changed within a range that does not cause polishing unevenness, and a target roll roughness can be easily obtained.

Further, according to the cold rolling method of the present invention,
Since the cold-rolled roll made of cemented carbide without polishing unevenness polished by the above method is incorporated into at least one of the plurality of rolling stands and cold-rolled, a high-gloss cold-rolled steel sheet having no unevenness in appearance can be obtained. You can get it.

[0032]

(Example 1) As shown in FIGS. 4 (a) and 4 (b), while rotating a roll made of cemented carbide having a diameter of 600 mmφ and rotating a cup-shaped diamond grindstone. The rolling roll was polished by obliquely intersecting the grindstone rotation axis and the roll axis, bringing the polishing work surface into contact with the roll surface, and moving the roll in the roll axis direction. However, the wheel rotation axis
The polishing work surface 1B is brought into contact with the rolling roll 2 along a straight line 1E on the polishing work surface 1B, which intersects with the roll axis 2A and is parallel to the roll axis 2A.

The grindstone was a cup-shaped diamond grindstone having a grindstone outer diameter of 125 mm and a grindstone width of 40 mm so that the roll roughness in the axial direction was 0.1 μmRa. As shown in Fig. 6, the rolling roll is made of high-speed steel with the roll axis centered and a 60 mm thick W
A sleeve containing C: 80 mass% and Co: 20 mass% is fitted. This rolling roll was incorporated into all the stands of a tandem mill consisting of five stands as shown in Fig. 5, and after hot rolling, annealed and pickled SUS 430 ferritic stainless steel sheet with a thickness of 4.0 mm was cooled at a rolling speed of 200 m / min. Cold rolling was performed to a thickness of 1.5 mm. In FIG. 5, each rolling stand is composed of a pair of upper and lower rolling rolls 2 and a backup roll 30A, and the rolling oil was supplied as a mineral rolling oil of 20 cSt (40 ° C.) in a 5% emulsion state.

On the other hand, as a conventional technique, the diameter is 600 mmφ.
Rolling roll made of cemented carbide with a grinding wheel outer diameter of 600 mm and a grinding wheel width of 10
Using a 0 mm disc-shaped grindstone, polishing is performed as shown in FIGS. 8A and 8B so as to have the same roll roughness as that of the invention example. It was assembled in all stands of the mill and cold rolled under the same conditions as in the invention.

As a comparative example, polishing was carried out under the same conditions as in the prior art except that a steel roll was used, and this roll was incorporated into all the stands of the same rolling mill as the inventive example. Cold rolling was performed in the same manner. The rolled steel sheet was subjected to finish annealing, pickling, and temper rolling under the same conditions, and the glossiness (Gs20 ゜) was measured.

As a result, in the polishing method of the invention, "hitting" could be prevented, and the rolling roll could be polished uniformly and efficiently. However, in the prior art, polishing unevenness due to "hitting" occurred. The cold-rolled steel sheet rolled by the method of the invention example was very uniform without any unevenness in appearance, whereas the cold-rolled steel sheet rolled by the method of the prior art had unevenness in appearance and did not become a product. Was. The gloss of the cold rolled steel sheet of the invention and the prior art was very good at 900 points or more, and the gloss of the cold rolled steel sheet of the comparative example was 580 points. (Example 2) As shown in FIGS. 2 (a) to 2 (c), while rotating a roll made of cemented carbide having a diameter of 600 mmφ and rotating a cup-shaped diamond grindstone, as shown in FIGS. And the roll axis were perpendicularly crossed and polished. However, the grinding work surface that intersects with the grinding wheel rotation axis 1A and is parallel to the roll axis 2A
Along the straight line 1E on 1B, the polishing work surface 1B is brought into contact with the rolling roll 2 for polishing.

The grindstone was a cup-shaped diamond grindstone having a grindstone outer diameter of 125 mm and a grindstone width of 40 mm so that the roll roughness in the axial direction was 1.1 μmRa. As shown in FIG. 7, the roll body of the rolling roll is integrally formed of a cemented carbide containing WC90; mass% and Co: 10 mass%, and the neck is made of ordinary steel. This rolling roll is incorporated into the first stand of a tandem mill composed of five stands, and the second to fifth stands include:
Polished as shown in FIGS. 8 (a) and 8 (b)
Rolled roll of cold die steel with a diameter of 600 mmφ with μmRa, hot rolled, annealed and pickled, 3.0 mm thick
SUS 304 austenitic stainless steel was cold rolled at 350 m / min to a thickness of 1.0 mm. Rolling oil is 3cSt (40
° C) in a 5% emulsion state.

On the other hand, as a conventional technique, the diameter is 600 mmφ.
Rolling roll made of cemented carbide with a grinding wheel outer diameter of 600 mm and a grinding wheel width of 10
8 (a) and 8 (b), using a 0 mm disc-type grindstone so as to have the same roll roughness as in the invention, and rolling the rolls in the same manner as in the invention. And cold rolling was performed under the same conditions as those of the invention.

As a comparative example, polishing was carried out under the same conditions as in the prior art except that a cold rolled roll of cold die steel was used. This roll was assembled into a first stand. Cold rolling was performed. The rolled steel sheet was subjected to annealing, pickling, temper rolling, and buffing (1 pass) under the same conditions, and the glossiness (Gs20 °) was measured.

As a result, in the polishing method of the invention, "hitting" could be prevented, and the rolling roll could be polished uniformly and efficiently. However, in the prior art, polishing unevenness due to "hitting" occurred. Further, the cold-rolled steel sheet rolled by the method of the invention example,
While the appearance was very uniform without unevenness, the cold-rolled steel sheet rolled by the method of the prior art had unevenness in appearance,
Did not become a product. The glossiness of the cold rolled steel sheet of the invention example and the prior art was very good at 950 points or more, whereas the glossiness of the cold rolled steel sheet of the comparative example was 650 points. (Example 3) As shown in FIGS. 4 (a) and 4 (b), while rotating a roll made of cemented carbide having a diameter of 600 mmφ and rotating a cup-shaped diamond grindstone, as shown in FIGS. And the roll axis were obliquely crossed and polished. However, the grinding work surface that intersects with the grinding wheel rotation axis 1A and is parallel to the roll axis 2A
Along the straight line 1E on 1B, the polishing work surface 1B is brought into contact with the rolling roll 2 for polishing.

The grindstone was a cup-shaped diamond grindstone having a grindstone outer diameter of 125 mm and a grindstone width of 40 mm so that the roll roughness in the axial direction was 0.05 μmRa. As shown in FIG. 6, the rolling roll is made of 5% Cr steel with the roll axis centered, and a 70 mm thick WC; 95 mass%, Co; 5 mass% containing cemented carbide sleeve is fitted around the roll. . This rolling roll was incorporated into the fifth stand of a tandem mill consisting of five stands,
-The fourth stand incorporates a roll of semi-high-speed steel of 0.2 µmRa and a diameter of 600 mmφ polished as shown in Fig. 8 (a) and Fig. 8 (b), and after hot rolling, annealing,
Cold-rolled at a rolling speed of 400 m / min onto a 2.0 mm thick SUS 430 ferritic stainless steel sheet with a thickness of 0.7 m
m. Rolling oil: 5 mineral oils of 20 cSt (40 ° C)
% Emulsion.

On the other hand, in the prior art, the diameter is 600 mm φ.
Rolling roll made of cemented carbide with a grinding wheel outer diameter of 600 mm and a grinding wheel width of 10
8 (a) and 8 (b), using a 0 mm disc-type grindstone so as to have the same roll roughness as in the invention, and rolling the rolls in the same manner as in the invention. And cold rolling was performed under the same conditions as those of the invention.

As a comparative example, 10 mm diameter of 600 mm
Polishing was carried out under the same conditions as in the prior art, except that the rolling roll was made of% Cr steel. This roll was incorporated into the fifth stand of the same rolling mill as that of the invention, and the other conditions were the same as those of the invention. gave. The rolled steel sheet was subjected to annealing, pickling and temper rolling under the same conditions, and the glossiness (Gs20 ゜) was measured.

As a result, in the polishing method of the invention, "hitting" could be prevented and the rolling roll could be polished uniformly and efficiently. However, in the prior art, polishing unevenness due to "hitting" occurred. Further, the cold-rolled steel sheet rolled by the method of the invention example,
While the appearance was very uniform without unevenness, the cold-rolled steel sheet rolled by the method of the prior art had unevenness in appearance,
Did not become a product. In addition, the glossiness of the cold rolled steel sheet of the invention example and the prior art was very good at 890 points or more, whereas the glossiness of the cold rolled steel sheet of the comparative example was 550 points.

[0045]

As described above, according to the polishing method of the present invention, it is possible to uniformly and efficiently polish a cemented carbide rolling roll without causing polishing unevenness. According to the cold rolling method of the present invention, there is an industrially beneficial effect that a high gloss cold rolled steel sheet having excellent uniformity in appearance can be obtained.

[Brief description of the drawings]

FIGS. 1A and 1B are a cross-sectional view and a bottom view showing the structure of a cup-shaped grindstone used in the polishing method of the present invention.

FIGS. 2 (a), 2 (b), and 2 (c) are a plan view, a XX sectional view, and a YY sectional view showing a contact state between a grindstone and a roll in the polishing method of the present invention. It is.

FIG. 3 is a view taken along the line ZZ in FIG. 2B showing a contact portion between a grindstone and a roll in the polishing method of the present invention.

FIGS. 4 (a) and 4 (b) are a sectional view and a Z′-Z ′ view showing another contact state of the grindstone and the roll in the polishing method of the present invention.

FIG. 5 is an arrangement diagram of an example of a rolling stand.

FIG. 6 is a sectional view showing a structure of a roll used in the embodiment.

FIG. 7 is a sectional view showing the structure of another roll used in the embodiment.

8 (a) and 8 (b) are a plan view and a sectional view showing a conventional roll polishing method.

[Explanation of symbols]

1 Grinding wheel 11 Grinding wheel base 12 Grain layer 1A Grinding wheel rotation axis 1B Grinding work surface 1C Grinding wheel rotation direction 1D Grinding wheel moving direction 1E Straight line on the grinding work surface that intersects with the grinding wheel rotation axis and is parallel to the roll axis 2 Rolling roll (roll) 2A Roll shaft 2B Roll body 2C Roll rotation direction 3A Clearance 3L, 3R Contact surface between grinding wheel and roll

Claims (3)

[Claims] 1. A polishing method for polishing a rolling roll by rotating a rolling roll made of cemented carbide and bringing the grinding wheel into contact with the rolling roll while rotating and moving the roll along the roll axis. A method for polishing a roll, wherein a grinding work surface of the grindstone is brought into contact with the roll using a cup-shaped grindstone such that the grindstone rotation axis and the roll axis intersect. 2. A polishing method for polishing a rolling roll by rotating a milling roll made of cemented carbide and bringing the grinding wheel into contact with the rolling roll while rotating and moving it along the roll axis. Using a cup-shaped grindstone, the grinding work surface of the grindstone is brought into contact with the rolling roll along a straight line on the grinding work surface of the grindstone, which intersects the grinding wheel rotation axis and is parallel to the roll axis. Polishing method for a rolling roll. 3. A cold roll is performed by incorporating a roll roll polished by the method of claim 1 or 2 into at least one of a plurality of roll stands. Cold rolling method.