JP2004042261A - Grinding method and cold rolling method of rolling-mill roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding method of a rolling-mill roll by which a cemented carbide-made rolling-mill roll can be ground uniformly and efficiently, and a cold rolling method by which a highly glossy cold rolled steel sheet excellent in a uniformity in appearance is obtained. <P>SOLUTION: A grind working face of a grindstone is brought into contact with the rolling-mill roll by crossing a grindstone turning shaft and a rolling shaft using a cap-like diamond wheel as the grindstone, in the grinding method for grinding the rolling-mill roll by turning the cemented carbide-made rolling-mill roll, and also by bringing into contact with the rolling-mill roll while turning the grindstone and by moving along the rolling axis. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a polishing method and a cold rolling method for a roll made of cemented carbide, and in particular, a method for polishing a roll suitable for use in cold rolling of a high gloss stainless steel sheet and a high gloss stainless steel sheet in a tandem mill. Cold rolling method.

As a method for manufacturing a high gloss stainless steel cold rolled steel sheet, for example, among a plurality of rolling stands of a tandem mill, at least one of the rolling stands is provided with a roll made of cemented carbide and cold rolled into a hot rolled steel sheet. A cold rolling method to be applied is known (Patent Document 1).

鋼 After the cold rolling, the steel strip is generally subjected to post-treatments such as finish annealing, pickling and temper rolling, and is generally made into a cold-rolled stainless steel sheet.

Conventionally, a disc-shaped diamond grindstone 100 shown in FIGS. 8 (a) and 8 (b) is used for polishing a roll made of cemented carbide. The disc-shaped diamond grindstone 100 is provided with a ring-shaped abrasive grain 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 the grinding wheel rotation shaft 101 of a grinding machine (not shown), and the grinding wheel 100 is rotated around the grinding wheel rotation shaft 101, The roll 200 is polished on the outer peripheral surface of the grindstone 100 by being brought into contact with the rolled roll 200 made of cemented carbide and moved along the roll axis 201.
JP-A-8-39103

In the method of polishing a roll made of cemented carbide on the outer peripheral surface of a disk-shaped diamond grindstone, when the degree of bonding of the grindstone is reduced, abrasive grains are remarkably dropped and the surface appearance changes along the roll axis direction. In addition, since the roughness of the roll cannot be set to a desired value, the degree of bonding of the diamond grindstone must be increased.

However, in the method of polishing a cemented carbide rolling roll on the outer peripheral surface of a diamond whetstone, when the degree of bonding of the abrasive layer is increased, a problem called "hitting" in which the whetstone bounces occurs, and a feed mark caused by this occurs. Therefore, there is a problem that the moving speed of the grindstone must be reduced, and the polishing efficiency is low.

In addition, when the rolling roll with 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, followed by finish annealing, pickling and temper rolling. When a cold-rolled steel sheet is subjected to such post-treatments, there is a problem that the uniformity in appearance is reduced even if the gloss is improved.

Therefore, an object of the present invention is to solve the above-described problems of the prior art, and a method of polishing a roll capable of uniformly and efficiently polishing a roll made of cemented carbide and uniformity in appearance. An object of the present invention is to provide a cold rolling method capable of obtaining a high-gloss cold-rolled steel sheet excellent in quality.

The present inventors use a cup-shaped grindstone, and by appropriately setting the positional relationship and the contact state between the grindstone and the rolling roll, the surface appearance changes along the roll axis direction. The present invention was completed by finding that a roll made of cemented carbide can be uniformly and efficiently polished without generating polishing unevenness due to a defect.

That is, the present invention relates to a polishing method for polishing a rolling roll by rotating a rolling roll made of a cemented carbide and moving the grindstone in contact with the rolling roll while rotating the grindstone and moving it along the roll axis. A grinding method for a roll, wherein a grinding surface of the grindstone is brought into contact with the roll by using a cup-shaped diamond grindstone, and intersecting the grindstone rotation axis and the roll axis.

The present invention also provides a polishing method for polishing a rolling roll by rotating a rolling roll made of cemented carbide and bringing the rolling stone into contact with the rolling roll while rotating and moving the roll along the roll axis. Using a cup-shaped diamond grindstone as the method, contacting the grinding work surface of the grindstone with the rolling roll along a straight line on the grinding work surface of the grindstone that intersects the grinding wheel rotation axis and is parallel to the roll axis. This is a method for polishing a roll.

In addition, the present invention is characterized in that, in the polishing method of a rolling roll according to any one of the above, only one of the polishing work surfaces of the grinding wheel is in contact with the rolling roll with the grinding wheel rotating shaft interposed therebetween. This is a method for polishing a rolling roll.

Further, the present invention is characterized in that a cold roll is performed by incorporating a roll roll polished by the method for polishing a roll roll according to any one of the above into at least one roll stand among a plurality of roll stands. Rolling method.

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, and according to the cold rolling method of the present invention, This has an industrially beneficial effect that a high-gloss cold-rolled steel sheet having excellent appearance uniformity can be obtained.

First, a description will be given of the cause of uneven polishing and the uniformity of appearance of a cold-rolled steel sheet during polishing of a roll made of cemented carbide.

研磨 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 slightly inclined with respect to the circumferential direction in accordance with the rotation of the roll and the feed of the grindstone, and the pattern is entered at a fixed cycle. to cause. Wear unevenness is due to the fact that the hardness of the rolling roll is very high and the hardness of the roll is extremely high.If the degree of bonding of the diamond grindstone is lowered, the abrasive grains will fall off remarkably. 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 mounted on 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 uneven polishing on the roll surface, the roughness profile of the roll surface changes correspondingly, so that the uneven polishing is transferred to the steel sheet, resulting in uneven appearance of the steel sheet surface, resulting in loss of uniformity. It is.

From the above-mentioned causes of the occurrence of the polishing unevenness of the roll made of cemented carbide, the wear unevenness of one of the polishing unevenness is solved by increasing the degree of bonding of the diamond grindstone, and the other feed mark is shown in FIG. a), a cup-shaped grinding wheel shown in FIG. 1 (b), and by limiting the contact state between the grinding wheel and the rolling roll, the problem was solved by preventing the occurrence of a problem called "hitting".

The cup-shaped grindstone was generally used to mirror-finish the surface of a steel-based rolling roll, but in this case, the polishing method used was, for example, a grindstone with a number of about 1000, and its abrasive grains were also made of, for example, alumina. Since polishing was performed using an alumina-based material such as zirconia, even if a cemented carbide roll was to be polished by this method, it could not be polished uniformly and efficiently.

In addition, from the relationship between the polishing unevenness of the rolling roll in cold rolling and the unevenness of the appearance of the cold-rolled steel sheet, the unevenness of the appearance of the cold-rolled steel sheet is reduced by a uniform hard roll made of a cemented carbide without polishing unevenness. The problem was solved by performing cold rolling.

Hereinafter, the method of polishing a roll according to 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 grain layer, 1A is a grindstone rotating shaft, and 1B is a polishing work surface.

As shown in FIG. 1A, the cup-shaped grindstone 1 includes a disc-shaped grindstone pedestal 11 provided with a shaft to be attached to a polishing machine, and a ring-shaped abrasive grain layer 12 holding diamond abrasive grains with a binder. The provided abrasive layer 12 is provided so as to be in contact with 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.

リ ン グ Then, as shown in FIG. 1 (b), a ring-shaped polishing work surface 1B is 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 diamond grindstone having a small grain size and a high degree of bonding when polishing, as compared with the base of the conventional grindstone shown in FIG. 8 (b). The amount of elastic deformation of the grindstone gantry is large, the roll and the grindstone come into contact more uniformly than the conventional grindstone, and the amplification of vibration can be suppressed, so that "hitting" can be prevented, and the grindstone 1 and the rolling roll described below. Since it is in a contact state with No. 2, the polishing can be stably performed, so that the occurrence limit of "hitting" can be improved, and the moving speed of the grindstone in the axial direction can be increased.

ロ ー ル The method of polishing a roll of the present invention will be described with reference to FIGS. 2 (a) to 2 (c), FIG. 3, and FIGS. 4 (a) and 4 (b). 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 arrow view of FIG. 2B showing a contact portion on the grindstone side during roll polishing.

FIGS. 4A and 4B are a cross-sectional view and a Z′-Z ′ arrow view illustrating another contact state of the grindstone and the roll during polishing. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the drawing, 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 with 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 rolling roll 2 is rotated, and at the same time, the body 2B of the rolling roll 2 is polished by bringing the diamond grindstone into contact with the rolling roll 2 while rotating and moving along the roll axis 2A. . The material of the body 2B of the rolling roll is a cemented carbide. At this time, a cup-shaped grindstone 1 is used, and as shown in FIG. 2 (a), FIG. 2 (b), FIG. 2 (c), or FIG. 4 (a), FIG. And the roll shaft 2A intersect, 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. When a roll having a small crown is polished, that is, when a roll having a small crown is polished, as shown in FIG. 3, a straight line on the polishing work surface 1B that intersects the grinding wheel rotation axis 1A and is parallel to the roll axis. The polishing work surface 1B is in contact with the rolling roll 2 along 1E. Both 3L and 3R in the drawing are the contact surfaces between the grinding wheel 1 and the rolling roll 2.

In the polishing method of the present invention, the grinding wheel 1 and the rolling roll 2 are made to contact along a 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 became possible to polish.

Further, as shown in FIG. 4A, when the grinding wheel rotating shaft 1A and the roll shaft 2A cross obliquely, and the polishing work surface 1B is brought into contact with the rolling roll 2, as shown in FIG. When polishing a roll having a small diameter, the grinding work surface 1B is brought into contact with the rolling roll 2 along a straight line 1E on the grinding work surface 1B which intersects the grinding wheel rotation axis 1A and is parallel to the roll axis 2A. Only 3L in the drawing is the contact surface between the grinding wheel 1 and the rolling roll 2. In this case, as shown in FIG. 4A, a gap 3A is formed between the polishing work surface 1B and the rolling roll 2 along the straight line 1E opposite to 3L with respect to the intersection with the grindstone rotating shaft 1A. .

In the polishing method of the present invention, even in such a contact state, the grinding wheel 1 and the rolling roll 2 are moved along the straight line 1E on the polishing work surface 1B which intersects the grinding wheel rotation axis 1A and is parallel to the roll axis 2A. As a result, the polishing can be stably performed.

方向 By the way, the direction of the grinding wheel peripheral speed VG vector on the contact surfaces 3L and 3R between the grinding wheel 1 and the rolling roll 2 almost coincides with the roll circumferential direction as shown in FIGS. 3 and 4 (b). 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 providing a polishing line substantially parallel to the roll circumferential direction.

In the above description, the case of polishing a roll with a small crown is described.However, when polishing a roll with a large crown, when the grinding wheel rotation shaft 1A and the roll shaft 2A intersect at a right angle, the grinding wheel rotation shaft 1A The polishing work surface 1B along one straight line 1E and the rolling roll 2 are in contact with each other across the point of intersection, so that it is possible to perform stable polishing, while the grindstone rotating shaft 1A and the roll shaft 2A are slanted. When they intersect, the polishing work surface 1B and the rolling roll 2 along the straight line 1E on both sides of the intersection with the grindstone rotation axis 1A come into contact with each other, so that stable polishing can be performed.

Therefore, in the polishing method of the present invention, if attention is paid to the contact state between the rolling roll 2 and the polishing work surface 1B of the grinding wheel 1, regardless of the crown of the rolling roll 2, it intersects with the grinding wheel rotation axis 1A and is connected to the roll axis 2A. If the polishing work surface 1B is brought into contact with the rolling roll 2 and polished along the straight line 1E on the parallel polishing work surface 1B, the occurrence of the "hitting" of the grinding stone can be suppressed and the polishing can be stably performed. . Here, when the grinding wheel 1 and the rolling 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 grinding wheel rotating shaft 1A, the grinding wheel 1 is moved once in the direction of the roll shaft 2A. When this is done, it is polished on the contact surfaces 3L and 3R, which is effective for giving a relatively coarse roughness.

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 rolling roll 2 is brought into contact with the contact surface. Polishing with only 3L is effective in providing relatively fine roughness. In addition, in the roll polishing method of 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, and the polishing unevenness can be made more inconspicuous.

Further, the grain 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, in the cold rolling method of the present invention, the cold rolling is performed by incorporating the hard metal-made rolling roll without polishing unevenness polished by the above-described method into at least one of the plurality of rolling stands. Thus, a high-gloss cold-rolled steel sheet having no unevenness in appearance can be obtained.

As shown in FIGS. 4 (a) and 4 (b), while rotating a roll of cemented carbide having a diameter of 600 mmφ and rotating a cup-shaped diamond grindstone, as shown in FIGS. Were crossed obliquely, the polishing work surface 1B was brought into contact with the roll surface, and the roll was polished by moving in the roll axis direction. However, 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 grinding wheel rotation axis 1A and is parallel to the roll axis 2A.

(4) The grinding wheel was a cup-shaped diamond grinding wheel having a grinding wheel outer diameter of 125 mm and a grinding wheel 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 sleeve containing WC: 80 mass% and Co: 20 mass% is fitted around the roll. 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, a SUS430 ferritic stainless steel sheet having 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.

(5) 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 is a mineral rolling oil of 20 cSt (40 ° C.) supplied in a 5% emulsion state.

On the other hand, as a prior art, a 600 mm diameter cemented carbide rolling roll is used as a grinding wheel outer diameter 600 mm, using a disk-shaped grinding wheel with a grinding wheel width of 100 mm, so as to have the same roll roughness as the invention example, Polished as shown in FIGS. 8 (a) and 8 (b), this roll was assembled into all stands of the same rolling mill as the invention, and cold rolling was performed under the same conditions as in the invention. did.

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

結果 As a result, in the polishing method of the invention example, “hitting” could be prevented, and the rolling roll could be polished uniformly and efficiently. However, in the conventional technique, 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 uneven appearance and did not become a product. Was. The glossiness of the cold rolled steel sheet of the invention example and the prior art was very good at 900 points or more, and the glossiness of the cold rolled steel sheet of the comparative example was 580 points.

As shown in FIGS. 2 (a) to 2 (c), while rotating a roll 2 made of cemented carbide having a diameter of 600 mmφ and rotating a cup-shaped diamond grindstone, as shown in FIGS. 2A was polished at right angles. However, 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 grinding wheel rotation axis 1A and is parallel to the roll axis 2A.

(4) The grinding wheel was a cup-shaped diamond grinding wheel having a grinding wheel outer diameter of 125 mm and a grinding wheel width of 40 mm so that the roll roughness in the axial direction was 1.1 μmRa. As shown in FIG. 7, the roll 2 has a roll body integrally formed of a cemented carbide containing WC: 90 mass% and Co: 10 mass%, and has a neck made of normal steel. This rolling roll 2 is incorporated into a first stand of a tandem mill composed of five stands, and the second to fifth stands have 0.1 μm Ra polished as shown in FIG. 8A and FIG. A roll of 600 mmφ cold die steel was incorporated, and after hot rolling, annealed and pickled, a 3.0 mm thick SUS 304 austenitic stainless steel was cold rolled at 350 m / min to a thickness of 1.0 mm. . As a rolling oil, a mineral rolling oil of 3 cSt (40 ° C.) was supplied in a 5% emulsion state.

On the other hand, as the prior art, a roll of 600 mmφ made of cemented carbide is used as a grinding wheel having an outer diameter of 600 mm and a disk-type grinding wheel with a grinding wheel width of 100 mm to have the same roll roughness as the invention example. 8 (a) and FIG. 8 (b), the roll was assembled in the first stand of the same rolling mill as the invention, and cold rolling was performed under the same conditions as in the invention. did. In addition, as a comparative example, polishing was performed under the same conditions as in the prior art except that a cold rolled roll of cold die steel was used, and this roll was assembled in the first stand. gave.

  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.

結果 As a result, in the polishing method of the invention example, “hitting” could be prevented, and the rolling roll could be polished uniformly and efficiently. However, in the conventional technique, polishing unevenness due to “hitting” occurred. Further, 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 uneven appearance, and did not become. The gloss of the cold-rolled steel sheet of the invention and the prior art was very good at 950 points or more, while the gloss of the cold-rolled steel sheet of the comparative example was 650 points.

As shown in FIGS. 4 (a) and 4 (b), while rotating a roll of cemented carbide having a diameter of 600 mmφ and rotating a cup-shaped diamond grindstone, as shown in FIGS. Were crossed diagonally and polished. However, 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 grinding wheel rotation axis 1A and is parallel to the roll axis 2A.

The grindstone 1 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 2 has a roll axis of 5% Cr steel, and a 70 mm thick WC; 95 mass%, Co; 5 mass% containing cemented carbide sleeve is fitted around the roll. is there. These rolling rolls were incorporated into the fifth stand of a tandem mill consisting of five stands, and the first to fourth stands were polished as shown in FIGS. After incorporating the rolling roll 2 of 600 mmφ semi-high-speed steel, hot rolling, annealing, and pickling, a 2.0 mm thick SUS 430 ferritic stainless steel sheet is subjected to cold rolling at a rolling speed of 400 m / min and a thickness of 0.7 mm. And As the rolling oil, a mineral rolling oil of 20 cSt (40 ° C.) was supplied in a 5% emulsion state.

On the other hand, as the prior art, a 600 mm diameter cemented carbide rolling roll is used as a grinding wheel with an outer diameter of 600 mm and a disk-type grinding wheel with a grinding wheel width of 100 mm to have the same roll roughness as the invention example. 8 (a), and polished as shown in FIG. 8 (b). This rolling roll 2 was assembled in the fifth stand of the same rolling mill as the invention, and cold rolling was performed under the same conditions as in the invention. did. As a comparative example, polishing was carried out under the same conditions as in the prior art except that a rolling roll of 10% Cr steel having a diameter of 600 mm φ was used. This rolling roll was incorporated into the fifth stand of the same rolling mill as the inventive example. Cold rolling was performed under the same conditions as those of the invention.

 The rolled steel sheet was subjected to annealing, pickling and temper rolling under the same conditions, and the glossiness (Gs20 ゜) was measured.

結果 As a result, in the polishing method of the invention example, “hitting” could be prevented, and the rolling roll could be polished uniformly and efficiently. However, in the conventional technique, polishing unevenness due to “hitting” occurred. Further, 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 uneven appearance, and did not become. The gloss of the cold-rolled steel sheet of the invention and the prior art was very good at 890 points or more, whereas the gloss of the cold-rolled steel sheet of the comparative example was 550 points.

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. 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 in the polishing method of the present invention. FIG. 3 is a view taken along the line ZZ in FIG. 2B showing a contact portion between the grinding wheel and the roll in the polishing method of the present invention. 4A and 4B are a cross-sectional view and a Z'-Z 'arrow view showing another state of contact between the grindstone and the roll in the polishing method of the present invention. FIG. 5 is a layout diagram of an example of a rolling stand. FIG. 6 is a sectional view showing the structure of the roll used in the example. FIG. 7 is a sectional view showing the structure of another roll used in the embodiment. FIGS. 8A and 8B are a plan view and a cross-sectional view showing a conventional roll polishing method.

Explanation of reference numerals

1 Whetstone 11 Whetstone pedestal 12 Abrasive layer 1A Whetstone rotation axis 1B Grinding work surface 1C Whetstone rotation direction 1D Whetstone movement direction 1E Straight line on polishing work surface that intersects whetstone rotation axis and is parallel to roll axis 2 Rolling roll (roll)
2A Roll shaft 2B Roll body 2C Roll rotation direction 3A Gap 3L, 3R Contact surface between grinding wheel 1 and rolling roll 2 30A Backup roll

Claims (4)

In 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 cup-shaped diamond grindstone is used as the grindstone. A method of polishing a roll, wherein a grinding wheel rotating shaft and the roll axis are crossed to bring a polishing surface of the grindstone into contact with the roll. In 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 cup-shaped diamond grindstone is used as the grindstone. Using a rolling roll, wherein the grinding work surface of the whetstone is brought into contact with the rolling roll along a straight line on the grinding work surface of the whetstone, which crosses the whetstone rotation axis and is parallel to the roll axis. Polishing method. 3. The method for polishing a rolling roll according to claim 1 or 2, wherein only one of the polishing working surfaces of the grinding wheel is in contact with the rolling roll with the grinding wheel rotating shaft interposed therebetween. Polishing method for rolling rolls. Cold rolling is performed by incorporating the rolling roll polished by the method for polishing a rolling roll according to any one of claims 1 to 3 into at least one rolling stand among a plurality of rolling stands. Rolling method.

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