JP3520847B2 - Polishing method for rolling rolls - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a polishing method for rolling roll for use in rolling a metal plate of high gloss, inclined in opposite directions to each other with respect to the circumferential direction of the rolling roll intermittent polishing marks (hereinafter also referred to as cross-polishing marks) to a polishing method for rolling roll to impart.

[0002]

2. Description of the Related Art On a surface of a metal plate after cold rolling, micro defects called oil pits having a depth of about several μm and a depth of 1 caused by transfer of a polishing grain of a roll called a scratch.
There are uneven micro defects of about μm, which is a cause of lowering the surface gloss. Therefore, various rolling methods for smoothing the surface of the metal plate during cold rolling and suppressing the generation of micro defects called oil pits and scratches have been proposed. For example, a special polishing method such as the polishing method described below is proposed. It has been proposed to provide a rolling roll (hereinafter, also simply referred to as a roll) with eyes to obtain a high-gloss metal plate having a small surface roughness.

For example, in Japanese Unexamined Patent Publication (Kokai) No. 8-267109, a lapping film is used to provide a roll with cross-polishing grains inclined by 30 ° or more with respect to the circumferential direction, and a cold-rolled steel sheet is rolled using this roll. It is disclosed to obtain a metal plate having excellent gloss. Further, in JP-A-5-253604, an ordinary roll grinder is used to impart a spiral mark-shaped polishing mark to the roll by controlling the rotation speed of the work roll and the feed speed of the grindstone, and this roll is A cold rolling method for obtaining a metal plate having excellent gloss is described.

Further, in Japanese Unexamined Patent Publication No. 7-265912, as shown in FIGS. 9 (a) and 9 (b), a disc-shaped (including a hollow disc-shaped (also referred to as cup-shaped)) grindstone 20 is provided. Using the offset amount of the grindstone as X and the inclination angle of the roll with respect to the normal line 10N as φ, one end P of the rotated grindstone 20 is brought into contact with the surface of the roll to be rotated, and the grindstone 20 is moved relative to the axis 10A of the roll. The roll 10 as shown in FIG.
There is disclosed a method of polishing a roll that imparts a polishing grain inclined to one side with respect to the circumferential direction and a rolling method using this roll.

However, the polishing method disclosed in the above-mentioned Japanese Patent Laid-Open No. 8-267109 provides a cross-polishing pattern with the lapping film by pressing the lapping film against the roll and applying a slight vibration in the axial direction of the roll. Since it is moved in the direction, the control is complicated, and the abrasive grains of the wrapping film easily wear out, so it is necessary to change the wrapping film frequently, the polishing efficiency is poor, and the wrapping film vibrates in the axial direction of the roll. Due to this, there is a problem that polishing unevenness (polishing pattern on appearance and unevenness of roll surface roughness) is likely to occur on the peripheral surface of the roll, and the metal plate rolled using this roll has uneven gloss. It was

In the polishing method for imparting spiral-shaped polishing stitches disclosed in JP-A-5-253604, for example, 30 °
When imparting a slanted polishing eye, because the grindstone is moved in the axial direction of the roll at a high speed of 0.68 times the peripheral speed of the roll, polishing defects called "tapping" tend to occur,
There is a problem that remarkable polishing unevenness occurs, and there is a problem that gloss unevenness is clearly transferred to a metal plate rolled by using this roll, and the product cannot be a product due to gloss unevenness.

Further, in the polishing method disclosed in Japanese Patent Laid-Open No. 7-265912, only a polishing grain inclined to one side with respect to the circumferential direction can be applied to the roll, and when this rolling roll is used, There was a problem that meandering occurred during rolling, causing rolling trouble.

[0008]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned problems in the conventional roll polishing method, and to easily and efficiently form a uniform cross-polishing pattern without polishing unevenness. It is to provide a polishing how the roll to be applied to the peripheral surface of the roll.

[0009]

[Means for Solving the Problems] The inventors of the present invention diligently studied a method of imparting cross-polished eyes to the peripheral surface of a roll, and paid attention to a hollow disk-shaped grindstone generally used for mirror-finishing the roll surface. And completed the present invention. The present invention uses a hollow disk-shaped grindstone is brought into contact with the rotated while rolling for b Lumpur rotating the whetstone, further is relatively moved in the axial direction of the rolling roll grinding rolling roll When doing
The offset amount of the grindstone exceeds 0 and the outer diameter of the grindstone is 1 /
If less than 2, when the grindstone is equally divided by the surface including the circumference of the rolling roll, the contact surfaces of the grindstone and the rolling roll are present on both sides of the bisector , and the grinding
The peripheral speed of the stone is more than 3 times the peripheral speed of the rolling roll.
And a method for polishing a rolling roll.

Further , the present invention uses a hollow disk-shaped grindstone.
Contact the rolling roll that is rotating while rotating the grindstone.
Touch and move relative to the axial direction of the rolling roll
When polishing the rolling roll, turn off the grindstone.
If the set amount exceeds 0 and less than 1/2 of the outer diameter of the grindstone ,
If the grindstone is equally divided on the surface including the circumference of the rolling roll,
If the contact surface between the grindstone and the rolling roll is
On both sides of the whetstone and on the inner peripheral side of the grindstone.
The grain size of the abrasive grains is larger than the grain size of the abrasive grains on the outer peripheral side.
A method for polishing a rolling roll, which is characterized by
It Further, the rotation axis of the grindstone may be inclined toward the moving direction so that the surface pressure of the contact surface in the front in the moving direction of the grindstone is higher than the surface pressure of the contact surface in the rear in the moving direction of the grindstone. This is a preferable method for polishing a rolling roll. Further, in the present invention, it is preferable that the upper limit of the offset amount of the grindstone is less than 1/2 of the inner diameter of the grindstone.

[0011] Also, in the present invention, it is preferable that the # 100 ~ # 400 abrasive grains size of the grinding wheel.

[0012]

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The method for polishing a roll of the present invention is completed by focusing on a hollow disk-shaped grindstone (hereinafter, simply referred to as a grindstone) used for mirror-finishing a roll. In addition, it is a polishing method that efficiently imparts a cross-polished grain to the roll without uneven polishing. The roll polishing method of the present invention will be described in detail below with reference to the drawings.

First, referring to FIG. 1 to FIG. 3, a cross-polished mesh is a flat roll (a roll whose peripheral surface is formed by rotating a straight line parallel to the roll axis around the roll axis).
In the present invention, a cross-polished grain is applied to a curved roll (a roll formed by a surface in which a curved line whose peripheral surface is along the roll axis is rotated around the roll axis). The polishing method in this case will be described later.

1 (a), 1 (b) and 1 (c),
FIG. 1 (a) is a partial plan view showing a contact state between a grindstone and a roll, illustrating a method for polishing a roll of the present invention.
2B is a partial cross-sectional view taken along the line BB of FIG. FIG. 2 is a plan view showing the direction of the peripheral velocity vector of the grindstone on the contact surface between the grindstone and the roll. Figure 3
FIG. 4 is a schematic development view of the surface of the roll showing the inclination angle of the cross-polished mesh applied by the roll polishing method of the present invention.

Here, 1 is a roll, 1A is a rotation axis of the roll (hereinafter simply referred to as a roll axis or axis), 1B is a rotation direction of the roll, 1N is a normal of the roll, 2 is a grindstone, and 2A is rotation of the grindstone. Shaft (hereinafter simply referred to as the axis or axis of the grindstone), 2B is the rotating direction of the grindstone, 2C is the moving direction of the grindstone, 2D is the contact area between the grindstone 2 and the rolling roll 1 is equally divided into the rolling roll axis 1A direction. Lines 3D, 3L, and 3R are contact surfaces between the grindstone 2 and the roll 1.

If the grindstone 2 is equally divided on a virtual surface including the circumference of the rolling roll, the equal dividing line becomes just 2D. Further, X is the offset amount, θ ₁ and θ ₂ are the directions of the outer peripheral velocity vector of the grindstone and the direction of the inner peripheral velocity vector of the grindstone on the contact surface between the grindstone and the roll, and θ ⁺ and θ ⁻ are given to the roll. It is one inclination angle and the other inclination angle of the cross-polished grain.

As shown in FIGS. 1 (a), 1 (b) and 1 (c), the grindstone 2 used in the present invention is provided so that a ring-shaped polishing surface is orthogonal to the axis 2A. A rotating mechanism for the grindstone 2 (not shown) is attached to the board surface opposite to the polishing surface. To polish the roll 1 using this grindstone 2,
The grindstone 2 is attached to a grindstone rotating mechanism of a roll grinder (not shown), the roll 1 is mounted to the same roll grinder, and is rotated by a roll rotating mechanism (not shown).
While rotating the grindstone 2, contact the rolled roll 1,
The roll 1 is polished by relatively moving it in the direction of the axis 1A of the roll 1.

At this time, in the roll polishing method of the present invention,
As shown in FIGS. 1 (a), 1 (b), and 1 (c), the offset amount X of the grindstone 2 is set to exceed 0 and less than 1/2 of the outer diameter of the grindstone 2, and Rolls 1L are the grinding surfaces 3L and 3R of the grindstone 2 on both sides of the line 2D that divides the contact area equally in the direction of the roll axis 1A.
It is characterized in that it is brought into contact with and is provided with a cross-polished grain.

In the figure, 3L and 3R are contact surfaces between the grindstone 2 and the roll 1. Here, in the roll grinder equipped with the roll 1 and the grindstone 2, the offset amount X of the grindstone 2 is set to exceed 0 and less than 1/2 of the outer diameter of the grindstone 2 as described above.
In order to bring the polishing surface of the grindstone 2 on both sides of the line 2D that divides the contact area of the roll 1 and the roll 1 into the roll axis 1A into contact with the roll 1, the grinding surface of the grindstone 2 faces the roll 1 and the axis of the grindstone 2
After making 2A coincide with the roll normal 1N, the above offset amount X
This can be easily done because the polishing surface of the grindstone 2 may be brought into contact with the roll 1 only by shifting in parallel.

In the above-mentioned roll polishing machine, the grindstone 2
Of the grinding wheel 2 and the axis 2A of the grindstone 2 are aligned with the roll normal, and then they are shifted in parallel by the same offset amount as above to pass the axis 2A of the grindstone 2 and the axis 1A of the roll 1.
By making the polishing surface of the grindstone 2 and the roll 2 contact each other on both sides of the surface perpendicular to the surface, it is possible to provide the roll with the same cross-polishing pattern as that provided by the roll polishing method of the present invention described above. .

Next, the operation of easily and efficiently imparting uniform cross-polished stitches to the roll 1 without unevenness of polishing by the above-described method of polishing a roll of the present invention will be described below. In the roll polishing method of the present invention, as shown in FIG. 2, the polishing surfaces 3L, 3R of the grindstone 2 are brought into contact with the roll 1 on both sides of a line 2D that equally divides the contact area between the grindstone 2 and the roll 1 in the roll axial direction. I am letting you.

In FIG. 2, θ ₁ and θ ₂ are the direction of the outer peripheral velocity vector of the grindstone and the direction of the inner peripheral velocity vector of the grindstone at the contact surfaces 3L and 3R between the grindstone 2 and the roll 1, respectively.
1B is the rotation direction of the roll 1, and the circumferential direction of the roll 1 is
It is parallel to 1B. As shown in FIG. 2, the grindstone 2 and the roll 1
The directions of the peripheral velocity vector of the grindstone 2 on the contact surfaces 3L and 3R with the are inclined in the opposite directions to the circumferential direction of the roll 1. That is, the direction of the peripheral velocity vector of the grindstone 2 between the outer peripheral edge and the inner peripheral edge of the one contact surface 3L is
The direction of the peripheral velocity vector of the grindstone 2 between the outer peripheral edge and the inner peripheral edge of the other contact portion 3R is inclined downward to the right in the drawing.

Therefore, in the roll polishing method of the present invention,
By only relatively moving the grindstone 2 in the direction of the axis 1A of the roll 1 at least once, as shown in FIGS. It is possible to impart cross polishing stitches, which are ⁺ and θ ^- tilted intermittent polishing stitches, to the circumferential surface of the roll 1. In the method for polishing a roll of the present invention, it is not necessary to give a slight vibration to the grindstone 2 in the direction of the axis 1A of the roll 1, the grindstone 2 is rotated, so that clogging is less likely to occur, and frequent replacement is not required. Therefore, it is possible to impart a uniform cross-polished grain to the circumferential surface of the roll 1 without uneven polishing.

In the present invention, the relative movement of the grindstone 2 means that the roll 1 is rotated and the rotating grindstone 2 is moved in the direction of the axis 1A of the roll 1, or the grindstone 2 is rotated and rotated. The roll 1 is moved in the direction of the axis 1A, or both the roll 1 and the grindstone 2 are moved in opposite directions. The relative moving speed of the grindstone 2 is set sufficiently smaller than the outer peripheral speed of the grindstone 2. By doing so, the inclination angles θ ⁺ and θ ⁻ of the cross-polished grain are not significantly affected.

According to the roll polishing method of the present invention, when the relative moving speed of the grindstone 2 is set to a low speed of, for example, about 1 mm / sec, the grindstone moving speed is increased to impart a spiral-shaped polishing grain to the roll. In this case, polishing failure called "tapping" that occurs in the case of occurrence does not occur. Using a grindstone with a finite width,
If the roll is polished at a finite number of revolutions of the grindstone while moving in the axial direction at a finite speed, theoretically, as shown in FIG. By increasing the number of rotations of the grindstone, as shown in FIG. 3 (b), the angle made by the left and right polishing eyes with respect to the circumferential direction approaches a symmetrical state,
It is not strictly symmetrical.

Further, by decreasing the width of the grindstone from the state of FIG. 3D, the left and right angles are different as shown in FIG. 3C, but the distribution of the polishing angles is narrowed. Although, not strictly flat line closer to. Furthermore, by increasing the rotation speed of the grindstone using a narrow grindstone,
(A), such as, angles but approaches a parallel state polishing marks symmetrical, not symmetrically strictly flat row.

In the present invention, in any embodiment,
Since a grindstone with a finite width is used to grind at a finite grindstone rotational speed, the grinding pattern in the state of FIG.
Although it does not become the polishing eyes of (a) to (c), it can be adjusted to a state close to it, and even in the state of FIG. 3 (d), sufficient gloss unevenness can be prevented and a gloss improving effect can be obtained. You can

In the roll polishing method of the present invention, the grindstone 2 is used.
The reason why the offset amount X is set to more than 0 and less than 1/2 of the outer diameter of the grindstone 2 is as follows. When the offset amount X of the grindstone 2 is set to 0, the direction of the peripheral velocity vector of the grindstone 2 on the contact surfaces 3L and 3R shown in FIG. If the average value of the tilt angle is less than 5 °, the effect of improving the gloss becomes insufficient, and when the offset amount X of the grindstone 2 is 1/2 of the outer diameter of the grindstone 2, the contact shown in FIG. Grinding stone 2 on surfaces 3L and 3R
The direction of the peripheral velocity vector of is almost parallel to the axis 1A of the roll 1, the average value of the inclination angle of the polishing grain exceeds 85 °, the abrasion of the cross polishing grain is fast, and the gloss improving effect of the cross polishing grain is maintained. Because it will not be possible.

The offset amount X is the axis of the roll 1.
It is the distance between 1A and the axis 2A of the grindstone 2.
Generally, the axis 2A of the grindstone 2 is made to coincide with the normal line 1N of the roll 1, and then the grindstone 2 is generally set to be offset by the offset amount X as described above. In the above description, the grindstone 2 is relatively moved in the axis 1A direction of the roll 1 to give the cross-polished grain to the flat roll. However, in the roll polishing method of the present invention, FIG.
(A) and FIG. 4 (b) can also be provided with cross-polished meshes on a curved roll whose diameter change is enlarged.

In the case of imparting cross-polishing stitches to a curved roll according to the present invention, the grindstone 2 is attached to a roll grinder (not shown), and the roll 1 is attached to the roll grinder to rotate the grindstone 2. As shown in FIGS. 4 (a) and 4 (b), when the flat roll is brought into contact with the rotated roll 1 and relatively moved in the axial direction of the roll 1, similar to the case where the flat roll is provided with cross-polishing stitches. In addition, the offset amount of the grindstone 2 is more than 0 and less than 1/2 of the outer diameter of the grindstone 2, and the grindstone 2 on both sides of the line 2D that equally divides the contact area between the grindstone 2 and the roll 1 in the roll axis 1A direction is ground. If the surface is brought into contact with the roll 1 and the grindstone 2 is relatively moved in the direction of the roll axis 1A while following the curve, it is possible to easily and efficiently impart a uniform cross-polished grain to the roll.

4 (a) and 4 (b) show the state of contact between the grindstone 2 and the roll 1 when the cross-polished grain is applied to the curved roll.
The same parts as those in (a) to FIG. 1 (c) are designated by the same reference numerals, and the description thereof will be omitted. FIG. 4B shows B ′ of FIG.
-B 'is a partial sectional view. The difference between the case where the cross-polishing stitch is applied to the flat roll and the case where the cross-polishing stitch is applied to the curved thrust roll are that when the grindstone 2 is moved in the axis 1A direction of the roll 1, in the former case, the grindstone 2 attached to the roll grinder is used. The axis of the grindstone 2 is held at a right angle to the axis 1A of the roll 1 so that the axis 2A of the roll 1 is parallel to the normal line 1N of the roll 1. In the latter case, the grindstone attached to the roll grinder is used. The angle formed by the axis 2A of the grindstone 2 and the axis 1A of the roll 1 is changed so that the axis 2A of the roll 2 is parallel to the normal line 1N of the roll 1 according to the roll curve.

By the way, when the present inventors provide cross-polishing stitches on the circumferential surface of the roll 1 by the above-described roll-polishing method of the present invention, they are applied on the contact surface 3L in front of the moving direction 2C of the grindstone 2C. It has been noticed that the depth of the grinds made is smaller than that of the grinds provided on the contact surface 3R behind the moving direction 2C of the grindstone 2. The cause is the contact surface 3 between the grindstone 2 and the roll 1.
The contact pressures at L and 3R are almost the same, and the grinding marks given at the contact surface 3L at the front in the moving direction 2C of the grindstone 2 are the contact surface at the rear.
This is because it is polished by 3R.

In the present invention, the surface pressures on the contact surfaces 3L and 3R are substantially equal to each other, in the present invention, the offset amount X of the grindstone 2 exceeds 0 and less than 1/2 of the outer diameter of the grindstone 2, and the grindstone 2 and the roll 1 In order to bring the polishing surfaces of the grindstones 2 on both sides of the line 2D that divides the contact area of 1 into the roll axis 1A direction into contact with the roll 1, the axis 2A of the grindstone 2 is aligned with the normal line 1N of the roll 1 in the roll grinder. After letting
Offset amount X of grindstone 2 exceeds 0 and 1/2 of outer diameter of grindstone 2
This is because the polishing surface of the grindstone 2 is brought into contact with the roll 1 as less than 1.

That is, FIGS. 1 (a) to 1 (c) show the case where the flat roll is provided with the cross polishing stitches, and FIG. 4 shows the case where the cross polishing stitches are provided to the curved roll.
As can be seen from (a) and FIG. 4 (b), since the polishing surface of the grindstone 2 is substantially parallel to the peripheral surface of the roll 1, the contact surface 3L at the front and the contact surface 3R at the rear in the moving direction of the grindstone 2 are The surface pressures of are almost equal.

Therefore, in the roll polishing method of the present invention, as shown in FIG. 5, the contact pressure of the contact surface 3L in the front in the moving direction 2C of the grindstone 2 is the contact surface 3R in the rear in the moving direction 2C of the grindstone 2. Shaft 2A of grindstone 2 so that it is higher than the surface pressure of
Is preferably inclined by an angle α with respect to the normal 1N of the roll 1 in the moving direction 2C. FIG. 5 is a partial cross-sectional view showing an inclining direction of a shaft 2A of a grindstone for explaining a preferred method for polishing a roll according to the present invention. The shaft of the grindstone 2 is taken along the line CC in FIG. 2 or in FIG. 4 (a). Pass 2A, roll 1 axis
This is the state when viewed in a cross section parallel to 1A and perpendicular to the paper surface. However, in FIGS. 2 and 4A, the axis 2A of the grindstone 2 is not shown, and instead of the axis 2A of the grindstone 2, the center O of the polishing surface of the grindstone 2 is shown. Axis 2A passes through this O.

The inclination angle α of the grindstone shaft 2A with respect to the roll normal 1N is within a range in which the grindstone 2 can maintain contact on the contact surfaces 3L and 3R on both sides due to elastic deformation, and the moving direction 2C of the grindstone 2
Of the polishing eyes applied on the front contact surface 3L, the depth after polishing on the rear contact surface 3R, and the depth of the polishing eyes applied on the rear contact surface 3R should be approximately equal. Good. The inclination angle α can be determined depending on the material of the rolling roll 1, the grain size of the grindstone, the material of the grindstone, etc., and is 0.01 to 0.
Can be 5 °.

In the preferred polishing method of the present invention, the surface pressure of the contact surface 3L in the front of the moving direction 2C of the grindstone 2 is higher than the surface pressure of the contact surface 3R in the rear of the moving direction 2C of the grindstone 2 during polishing. , The axis 2A of the grindstone 2 is inclined with respect to the normal line 1N of the roll 1 in the moving direction 2C, so that the front contact surface
It is possible to make the depth of the polishing grain applied by 3L after being shallowed by being polished by the rear contact surface 3R and the depth of the polishing grain applied by the rear contact surface 3R.

In the case of the rolls having the cross-polishing stitches of substantially the same depth, the polishing stitches have a longer life and the rolling length is longer than that of the rolls having the cross-polishing stitches of different depths. It was also found from the experimental results that the gloss improving effect can be maintained. In these figures, the moving direction 2C of the grindstone 2 is the left direction, but it may be the opposite right direction. In this case, the contact surface in front of the moving direction of the grindstone 2 is 3R, and the moving direction of the grindstone 2 is The contact surface at the back of is 3L. Further, in these figures, the grindstone 2 is moved in the direction of 2C, but the rolling roll 1 may be moved in the direction opposite to 2C.

In a roll polishing method according to the present invention, the upper limit of the offset amount X of the grindstone 2 is preferably less than 1/2 of the inner diameter of the grindstone 2, although this is not the case here. The reason for this is that the upper limit of the offset amount X of the grindstone 2 is 1 / n of the inner diameter of the grindstone 2.
2 or more and less than 1/2 of the outer diameter, as shown in FIG.
As shown in FIG. 6 (b), the polishing surface of the grinding stone 2 in the range of 1/2 or more of the inner diameter of the grinding stone 2 and the offset amount X does not come into contact with the roll 1 and wear on the polishing surface of the grinding stone 2 is Since it is likely to be uniform, when polishing a large-diameter roll having a large polishing area, the truing of the grindstone 2 (processing the deformed grindstone surface as shown in FIG. 6 (b) flat for each predetermined polishing area),
This is because dressing (sharpening) is required, the efficiency of polishing work is lowered, and the polishing cost is increased.

[0041] In the polishing method of the present invention, it is important relationship with the outer peripheral speed of the grinding periphery speed and roll, the outer peripheral speed of the grinding 2 shall be the more than three times the outer peripheral speed of the rolls.
The reason for this is that on the contact surface between the grindstone and the roll, for example, the angle with respect to the circumferential direction of the outer peripheral velocity vector of the grindstone is 10 °.
As an example, the offset amount is set so that the outer peripheral speed of the grindstone 2 is less than 3 times the outer peripheral speed of the roll, as shown in FIG. Being bigger, 50 from the target polishing angle
%, The gloss of the metal plate may not reach the target in some cases. Even if the angle of the outer peripheral velocity vector with respect to the circumferential direction is changed, a cross-polished grain that improves the gloss of the metal plate can be obtained when the angle is three times or more.

[0042] Alternatively, the polishing method of the present invention, you larger than the abrasive grains of grain size on the outer side of abrasive grains of grain size in the inner periphery of the grinding wheel. The reason for this is as follows. In the preferred polishing method of the present invention, at the time of polishing, the grindstone 2 is adjusted so that the surface pressure of the contact surface 3L in the front in the moving direction 2C of the grindstone 2 becomes higher than the surface pressure of the contact surface 3R in the rear in the moving direction 2C of the grindstone 2. When the shaft 2A is tilted in the moving direction, the state shown in FIG. 8 is obtained depending on the polishing conditions.

That is, in front of the moving direction 2C of the grindstone 2, the inner peripheral side of the grindstone 2 does not come into contact with the roll 1 and a gap 4L is formed, and behind the moving direction 2C of the grindstone 2, the outer peripheral side of the grindstone 2 is in roll 1. The gap 4R without contacting the
The outer peripheral side in the contact surface 3L in the front of the moving direction 2C strongly contacts the roll 1, while the contact surface 3R in the rear in the moving direction 2C of the grindstone 2 has the inner peripheral side of the grindstone in the roll 1 contrary to the front. Make strong contact. Further, in the preferred polishing method of the present invention, the surface pressure of the contact surface 3L in the front in the moving direction 2C of the grindstone 2 is set to be higher than the surface pressure of the contact surface 3R in the rear in the moving direction 2C of the grindstone 2.

For this reason, when the grain sizes of the abrasive grains on the inner peripheral side and the outer peripheral side of the grindstone 2 are the same, the number of grooves per unit length in the direction of the roll shaft 1A applied on the contact surface 3R makes contact. Surface 3L
It was less than the number of grooves given in. And
Cross-polishing with a grindstone in which the grain size of the abrasive grains on the inner peripheral side of the grindstone 2 is made larger than the grain size of the abrasive grains on the outer peripheral side, and the average diameter of the abrasive grains on the inner peripheral side of the grindstone 2 is smaller than that on the outer peripheral side. When the eyes are applied to the roll, the number of grooves per unit length in the roll axial direction applied on the inner peripheral side of the grindstone 2 and the number of grooves applied on the outer peripheral surface of the grindstone 2 can be made substantially the same. This is because, as a result of rolling with this roll, it was found that the effect of the cross-polished grain can be further maintained.

The difference in grain size between the inner and outer circumferences of the grindstone 2 depends on the pressing pressure difference between the inner and outer circumferences of the grindstone 2 and the roll material. In this case, the number of the grooves of the polishing eyes inclined to one side and the number of the grooves of the polishing eyes inclined to the other side may be set to be substantially the same. Here, the grain size of the abrasive grains of the grindstone 2 used in the present invention is preferably # 100 to # 400.

The reason for this is that the grain size of the abrasive grains of the grindstone 2 is # 100.
If it is less than less than 100 μm, the polishing grain applied to the roll becomes coarse, which may cause baking and uneven gloss. On the other hand, if the grain size of the abrasive grains of the grindstone 2 exceeds # 400, the surface of the metal plate is smoothed. This is because the effect is reduced and the effect of improving the gloss of the cross-polished surface is reduced. Therefore, the grain size of the abrasive grains of the grindstone 2 used in the present invention is preferably set to # 100 to # 400.

The grain size of the # 100 to # 400 abrasive grains is
Diamond and cubic boron nitride (also called CBN)
16/18 specified as the type of abrasive grain size (JIS B4130)
~ 325/400 out of 100/120 to 325/400,
The particle size exceeding this range is too small to be suitable for imparting abrasive marks to the roll surface, and conversely the particle size below is
In some cases, the particle size is too large, the polishing is too sparse, and the metal plate is not sufficiently glossy.

The material of the abrasive grains of the grindstone 2 used in the present invention can also be commonly used diamond or CBN. When CBN is used when cross polishing is applied to a steel roll, diamond is used. It is good because it will not be seized like a steel roll. The binder that holds the abrasive grains and forms the abrasive grain layer portion may be resin or vitrified, and the concentration of the abrasive grains may be in the range of 50 to 200, and in particular, When the concentration of the abrasive grains is 75 or 100, it is preferable because the roll surface can be provided with abrasive grains having a uniform depth.

Next, a roll having a cross-polished grain by the above-mentioned polishing method of the present invention will be described. Since the cross-polishing pattern imparted by the polishing method of the present invention is uniform without polishing unevenness, the metal plate can be rolled without meandering for the following reasons, and a high-gloss metal plate without unevenness in gloss can be obtained. It is considered possible.

Since the cross grinds are inclined in the roll bite in directions opposite to each other with respect to the longitudinal direction of the rolling, the thrust force acting on the metal plate can be offset, and the metal plate can be stably rolled without meandering. it can. Since the cross polishing grain is inclined with respect to the rolling longitudinal direction, compared to when the polishing grain is attached in the roll circumferential direction or when the roll surface is a mirror surface, the polishing grain and the metal plate are Since the effect of smoothing the surface of the metal plate obtained by rubbing is large and the occurrence of micro defects can be suppressed, a high-gloss metal plate can be obtained. Since the rolling is performed with a roll having a uniform cross-polishing with no unevenness in polishing, a metal plate with no unevenness in gloss can be obtained.

[0051]

The present invention will be specifically described below with reference to examples. In Examples 1 to 3, the flat rolls were provided with cross-polished meshes, and the first to fifth cold tandem rolling mills were used.
In the case of being incorporated into a stand or a rolling stand of a 12-high cluster rolling mill, in Example 4, the curved rolls are incorporated into the first to fifth stands of the cold tandem rolling mill, and the first to fifth stands thereof are used. This is a case where the curve is sequentially set to a half amplitude (phase 0 to π) sine curve of 200, 200, 100, 100, 50 μm per radius, and a cross-polished grain is given to the curved roll. [Example 1] First to fifth semi-high-speed steel pipes having a diameter of 600 mm
After rolling the rolling rolls to be incorporated in the stand under the polishing conditions shown in Table 1, the rolls were assembled into a cold tandem rolling mill consisting of 5 stands as a pair of upper and lower, and the material thickness after hot rolling, annealing and pickling was 4.0 mm. A SUS 430 ferritic stainless steel plate was rolled to a thickness of 1.5 mm.

The total rolling length after incorporating the rolls into the cold tandem rolling mill is memorized, and the obtained steel sheet is further subjected to annealing, pickling and temper rolling to obtain a steel sheet having the above-mentioned total rolling length. The glossiness (GS 20 °) was measured. Table 1 shows the polishing conditions and the inclination angle of the polishing, roll roughness Ra after polishing (arithmetic mean roughness of JIS B 0601: hereinafter simply referred to as roughness), presence or absence of polishing unevenness of the roll after polishing, and during rolling. The presence or absence of meandering, the total rolling length, and the glossiness (GS 20 °) of the steel sheet at this total rolling length are also shown.

The inclination angles θ ⁺ and θ of the polishing grain of the roll
^- it is a case in which the inclined toward the upper left when the theta ^+, from lower right are inclined toward the upper right from the lower left oblique as shown in Figure 3 theta ^- the circumferential The angle with the direction. The same applies to the following examples. Roll roughness was measured in the axial direction of the roll. In the cold tandem rolling mill, the rolling speed was set to 200 mpm, and the rolling was performed while supplying the mineral-based rolling oil of 20 cSt (40 ° C.) in a 5% emulsion state.

In Invention Examples A01 to A08, a CBN wheel (JIS B 4131 shape 6A2) was used as a hollow disc-shaped grindstone, and when the grindstone was rotated and brought into contact with a rotated roll, the roll was polished. , If the offset of the grindstone is more than 0 and less than 1/2 of the outer diameter of the grindstone and the grindstone is equally divided by the surface including the circumference of the roll, the contact surface between the grindstone and the roll exists on both sides of the bisector. The whetstone was brought into contact with the roll so that the roll was moved once (one way) in the axial direction of the roll to give a cross-polished grain.

In Comparative Example A09, the offset amount of the grindstone was set to 0.
The other conditions were the same as those of Inventive Example A01, and polishing grains substantially parallel to the circumferential direction were provided. As a conventional example, a lapping film is used, a lapping film is vibrated at 5 Hz in the axial direction of the roll at 5 Hz to provide a cross grind, and a flat grindstone is used. The conventional example A11 in which a spiral polishing grain is imparted by increasing the moving speed of the grindstone, and one end of a hollow disc-shaped grindstone is brought into contact with the grindstone having the same grain size and shape as in Example A01, and the slanting is performed only on one side. Conventional example A12 with eyes was set.

The comprehensive evaluation was performed as follows. The polishing of the rolls and the meandering at the time of rolling do not occur, and it is possible to give a cross-polished grain to 10 rolls without truing and dressing, and the gloss of the steel sheet (GS 20 °) is 880 or more at the rolling length of 10km. In the case of ○, cross-polishing can be applied to 10 rolls without truing and dressing, and when the gloss of the steel sheet (GS 20 °) exceeds 880 over the rolling length of 10 km and is 880 or more, ◎, and △ is If there is no uneven polishing of the roll or meandering during rolling, and the glossiness is 880 or more at a rolling length of 10 km, but the number of dressings is per roll, or if the glossiness of the steel sheet (GS 20 °) is the rolling length. In the case of 10 km, it is assumed that it is 850 or more and less than 880. × indicates the case where the glossiness is less than 850, or the roll polishing unevenness or the meandering during rolling occurs.

[0057]

[Table 1] From the results, in Invention Examples A01 to A08, the polishing unevenness of the roll and the meandering at the time of rolling did not occur, and the glossiness of the steel sheet was compared with that of Comparative Examples.
You can see that it is better than A09. Invention Example A01 ~
Of A08, turn the axis of the grindstone toward the normal of the roll so that the surface pressure of the contact surface in the front in the moving direction of the grindstone is higher than the surface pressure of the contact surface in the rear in the moving direction of the grindstone. Invented Example A02, which has been inclined, has a longer life than the inventive Example A01 and can maintain the gloss improving effect of the cross-polished eyes.

Further, the offset amount of the grindstone is set to the inner diameter of the grindstone.
In Inventive Example A03 with 1/2 or more, non-uniform wear occurs on the polishing surface, so it was necessary to truing and dressing the grindstone each time a roll was cross-polished. In the invention example in which is less than 1/2 of the inner diameter of the grindstone, dressing of the grindstone is unnecessary until the cross-polished stitches are applied to 10 rolls, and the polishing cost is the invention example A0.
It was possible to reduce than 3.

Further, in Invention Example A01 in which the outer peripheral speed of the grindstone was set to be three times or more the outer peripheral speed of the roll and the other conditions were the same as those of Invention Example A04, the glossiness of the steel sheet was higher than that of Invention Example A04. Further, in Invention Example A05 in which the grain size of the abrasive grains on the inner peripheral side was made larger than the grain size of the abrasive grains on the outer peripheral side, and the axis of the grindstone was inclined with respect to the normal line of the roll, it was larger than that of Invention Example A02. Even if the rolling length becomes long, the glossiness of the steel sheet is kept good. In other words, the life of the polishing grain is long, and the effect of improving the glossiness of the cross polishing grain can be further maintained.

[0060] In addition, the abrasive grains of grain size of the grinding wheel # 100 to # 40 0
In Invention Examples A01, A06, and A07, the glossiness of the steel sheet is better than that of Invention Example A08 in which the particle size is out of the range and other conditions are the same. And, the steel sheet obtained by the invention example did not have uneven gloss. On the other hand, using the wrapping film, the conventional example A10 in which the lapping film was vibrated in the axial direction of the roll to give a cross-polishing grain, and the flat grinding stone was used in the conventional example A11 in which a spiral-polishing grain was provided. Uneven polishing occurs,
And the unevenness of luster also occurred on the steel plate, and the product was downgraded. Further, in Conventional Example A12 in which one end of a hollow disk-shaped grindstone was brought into contact with and one side thereof was provided with a slanted polishing grain, meandering occurred during rolling and the rolling had to be stopped. [Example 2] Rolls made of cold die steel and having a diameter of 80 mm were rolled under the polishing conditions shown in Table 2 and then paired in a 12-high cluster type rolling machine as a pair of upper and lower parts to perform hot rolling, annealing, and acid rolling. Material thickness after washing 3.
A 0 mm SUS 304 austenitic stainless steel plate was rolled to a thickness of 0.25 mm.

The total rolling length after incorporating the rolls into the 12-high cluster type rolling mill was memorized, and the obtained steel sheet was further subjected to annealing, pickling, temper rolling, and buffing 1 pass under the same conditions. After that, the glossiness (GS 20 °) of the steel sheet in the above total rolling length was measured. Table 2 shows the polishing conditions and the inclination angle of the polishing, the roll roughness after polishing, the presence or absence of uneven polishing of the roll after polishing, the presence or absence of meandering during rolling, the total rolling length, and the glossiness of the steel sheet at this total rolling length. (GS 20
°) is also shown.

The roll roughness was measured in the axial direction of the roll. In the 12-high cluster rolling mill, the rolling speed was set to 200 m / min, and mineral oil having a viscosity of 3 cSt (40 ° C) was supplied in neat and rolling was performed in 9 passes. In the invention examples B01 to B08, the CBN wheel (JIS B 4131 shape) is used as a hollow disk-shaped grindstone.
6A2), while rotating this grindstone and bringing it into contact with the rolled roll, when polishing the roll, the offset amount of the grindstone is more than 0 and less than 1/2 of the outer diameter of the grindstone, and the grindstone is When the surface including the circumference is equally divided, the grindstone is brought into contact with the roll so that the contact surfaces of the grindstone and the roll are on both sides of the bisector, and the cross-grinding is imparted by moving once in the axial direction of the roll. .

In Comparative Example B09, the offset amount of the grindstone was set to 0.
The other conditions were the same as in Invention Example B01, and polishing grains substantially parallel to the circumferential direction were provided. As a conventional example, a lapping film is used, a conventional lapping film is oscillated at 8.5 Hz in the axial direction of the roll to provide a cross-polished grain, and a flat grindstone is used. And, the conventional example B11 in which a spiral polishing grain is imparted by increasing the moving speed of the grindstone, and one end of the hollow disk-shaped grindstone are brought into contact with each other, and the grindstone having the same grain size and shape as in Example A01 is used to grind only one side. This is Conventional Example B12 with eyes.

The comprehensive evaluation was performed as follows. No uneven polishing of rolls, meandering during rolling, and steel sheet glossiness (GS 20 °) at a rolling length of 10 km are shown in Table 850, ○ when the back is 919 or higher, and steel sheet glossiness (GS 20 °). Rolled length 10
Table 850 when the distance exceeds km and ◎ for the back 919 or higher. △ indicates that the polishing of the roll and the meandering during rolling do not occur, and the gloss of the steel sheet (GS 20 °) is 10 km at the rolling length (Table 800). / Back 86
9) or more and less than (front 850 / back 919). × indicates that the gloss of the steel plate is less than (Table 800 / Back 869), or that uneven polishing of the roll or meandering during rolling occurs.

[0065]

[Table 2] From the results, in Invention Examples B01 to B08, the polishing unevenness of the roll and the meandering at the time of rolling did not occur, and the glossiness of the steel sheet was compared with Comparative Examples.
You can see that it is better than B09. Invention Example B01 ~
In B08, turn the axis of the grindstone toward the normal of the roll so that the surface pressure of the contact surface in the front in the moving direction of the grindstone is higher than the surface pressure of the contact surface in the rear in the moving direction of the grindstone. In the invention example B02 that is inclined, the glossiness of the steel sheet is kept good even when the total rolling length is longer than that of the invention example B01. In other words, the life of the polishing grain is long, and the gloss improving effect of the cross polishing grain can be maintained.

Further, the offset amount of the grindstone is set to the inner diameter of the grindstone.
In the invention example B03 of 1/2 or more, even if the cross-polishing stitches were given to the two rolls, no significant uneven wear was generated on the polishing surface of the grindstone, and it was necessary to dress the grindstone. There was no difference in polishing cost from the invention example in which the offset amount of the grindstone was less than 1/2 of the inner diameter of the grindstone.

Further, in Invention Example B01 in which the outer peripheral speed of the grindstone is 3 times or more the outer peripheral speed of the roll and other conditions are the same as those of Invention Example B04, the glossiness of the steel sheet is higher than that of Invention Example B04. Further, in Invention Example B05 in which the grain size of the abrasive grains on the inner circumference side is made larger than the grain size of the abrasive grains on the outer circumference side, and the axis of the grindstone is inclined with respect to the normal line of the roll, invention example B02 is It has a long life of the polishing grain and can maintain the gloss improvement effect of the cross polishing grain.

[0068] In addition, the abrasive grains of grain size of the grinding wheel # 100 to # 40 0
In Invention Examples B01, B06, and B07, the grain size is out of the range, and the glossiness of the steel sheet is better than that of Invention Example B08 in which the other conditions are the same. Then, the steel sheet obtained in the invention example did not have uneven gloss. On the other hand, using the lapping film, the conventional example B10 in which the lapping film was vibrated in the axial direction of the roll to provide the cross polishing marks, and the flat grinding stone, in the conventional example B11 in which the spiral polishing marks were applied, Uneven polishing occurs,
And the unevenness of luster also occurred on the steel plate, and the product was downgraded. Further, in Conventional Example B12 in which one end of a hollow disk-shaped grindstone was brought into contact with and one side thereof was provided with a slanted polishing grain, meandering occurred during rolling, and the rolling had to be stopped. [Example 3] Rolls for rolling, which are made of semi-high speed steel and have a diameter of 600 mm and which are to be incorporated into first to fifth stands, which are made of the same material and have the same dimensions as in Example 1, are polished under the polishing conditions shown in Table 3, and a pair of upper and lower sides is prepared. As a built-in cold tandem rolling mill consisting of 5 stands,
After hot rolling, annealing and pickling, SUS 430 ferritic stainless steel with a material thickness of 2.0 mm was rolled to a thickness of 0.7 mm.

The total rolling length after the rolls were installed in the cold tandem rolling mill was memorized, and the obtained steel sheet was further subjected to annealing, pickling and temper rolling to obtain a steel sheet having the above-mentioned total rolling length. The glossiness (GS 20 °) was measured. Table 3 shows the polishing conditions and the inclination angle of the polishing mesh, the roll roughness after polishing, the presence or absence of uneven polishing of the roll after polishing, the presence or absence of meandering during rolling, the total rolling length, and the glossiness of the steel sheet at this total rolling length. (GS 20 °) is also shown.

The roll roughness was measured in the axial direction of the roll. In the cold tandem rolling mill, the rolling speed was set to 400 mpm, and rolling was performed while supplying 20 cSt (40 ° C.) of mineral rolling oil in a 5% emulsion state. In the invention examples C01 to C06, the CBN wheel (JISB4131
Shape 6A2), when the grinding wheel is rotated and brought into contact with the rotated roll to polish the roll, the offset amount of the grinding stone is more than 0 and less than 1/2 of the outer diameter of the grinding stone, and the grinding stone 2 Is equally divided in the roll axis 1A direction on the surface including the circumference of the roll 1, the grindstone 2 is brought into contact with the roll so that the contact surfaces of the grindstone and the roll are present on both sides, and
It was moved one time (one way) to give a cross-polished grain.

At that time, the inclination angle of the polishing eyes of the roll and the offset amount were changed within the ranges shown in the table. In Comparative Example C11, the offset amount of the grindstone was set to 0, and the other conditions were the same as those of Inventive Example C01, and polishing grains substantially parallel to the circumferential direction were provided. As a conventional example C12, a cylindrical disk-shaped grindstone was used,
While rotating, the circumferential side surface was pressed against the circumferential surface of the roll to give a polishing grain substantially parallel to the circumferential direction of the roll.

The comprehensive evaluation was performed as follows. No uneven polishing of rolls or meandering during rolling is possible, and cross-polishing can be applied to 10 rolls without truing and dressing, and the glossiness of the steel sheet (GS 20 °) is 900 or more at a rolling length of 20km. ○, the gloss of the steel sheet (GS
20 °) is more than 950 when the rolling length is over 20 km, △ is △, and there is no uneven polishing of the roll or meandering during rolling, and the gloss is 900 or more at the rolling length of 20 km, but truing and dressing. If the number of rolls is one roll,
Alternatively, the gloss of the steel sheet (GS 20 °) is 800 when the rolling length is 20km.
Above, it is less than 900. × indicates the case where the glossiness is less than 800, or the roll polishing unevenness or the meandering during rolling occurs.

[0073]

[Table 3] From the results, in invention examples C01 to C06, the polishing unevenness of the roll and the meandering at the time of rolling did not occur, and the glossiness of the steel sheet was a comparative example.
It can be seen that it is better than C11 and conventional example C12.

Further, as in the invention examples C02 to C04 and C06, when the inclination angles of all the polishing eyes are in the range of 5 ° to 85 °, the invention examples having the polishing eyes partially outside the range.
The glossiness of the steel sheet is better than that of C01 and C05. Further, in Invention Example C05 in which the offset amount of the grindstone is 1/2 or more of the inner diameter of the grindstone, uneven wear occurs on the polishing surface, and therefore it is necessary to dress the grindstone every time a roll is cross-polished. However, in the invention examples C01 to C04 and C06 in which the offset amount of the grindstone was less than 1/2 of the inner diameter of the grindstone,
It is not necessary to dress the grindstone until cross-grinding is applied to the 10 rolls, and the offset amount of the grindstone is 1 / the inner diameter of the grindstone.
The polishing cost could be reduced as compared with Invention Example C05 in which 2 or more were set.
[Embodiment 4] Rolls of semi-high-speed steel having a diameter of 600 mm to be incorporated in the first to fifth stands are sequentially curved from the upstream side in the order of 200, 200, 100, 100, 50μ per radius.
After making a half amplitude (phase 0 to π) sine curve of m and polishing under the polishing conditions shown in Table 4, rolls with the curve (diameter at the center of the cylinder length is 600 mm) as a pair in the upper and lower sides of each of the cold tandem rolling mills. Assembled in a stand, and other conditions are the same as those in the third embodiment.
Roll the same as above, remember the total rolling length after incorporating the roll in the cold tandem rolling mill, and
The obtained steel sheet was further subjected to annealing, pickling and temper rolling, and the glossiness (GS 20 °) of the steel sheet in the above total rolling length was measured.

Table 4 shows the polishing conditions, the inclination angle of the polishing mesh on the roll, the roll roughness after the polishing, the presence or absence of uneven polishing of the roll after the polishing, the presence or absence of meandering during rolling, the total rolling length, and the total rolling pressure. Gloss of steel sheet in extension (GS 20
°) is also shown. The roll roughness was measured in the axial direction of the roll. With the cold tandem rolling mill,
Rolling was performed while supplying mineral rolling oil of 20 cSt (40 ° C.) in an emulsion state of 5% at 200 mpm.

The rolls to be incorporated in the first to fifth stands of Invention Examples D01 to D08 were CBN wheels (JIS B4131 shape 6A2) as a hollow disk-shaped grindstone, and the above curve was formed by rough polishing, and then cross polishing was performed. When giving eyes, as shown in FIGS. 4 (a) and 4 (b), the axis of the grindstone 2 attached to the grinder (not shown) is parallel to the normal line 1N of the roll 1 according to the roll curve. So that the angle between the axis of the grindstone 2 and the axis of the roll 1 is changed and the offset amount of the grindstone 2 is more than 0 and less than 1/2 of the outer diameter of the grindstone 2, the grindstone 2 is a circle of the roll 1. When the surface including the circumference was equally divided in the direction of the roll axis 1A, the grindstone 2 was brought into contact with the roll 1 so that the contact surfaces exist on both sides thereof, and moved once in the axial direction of the roll 1.

In Comparative Example D11, the rolls incorporated in the first to fifth stands were set to have a grindstone offset amount of 0 and the other conditions were the same as in Invention Example D01, and were provided with polishing eyes substantially parallel to the circumferential direction. . As the conventional example D12, first to fifth
For the roll to be incorporated in the stand, use a cylindrical disk-shaped grindstone,
While rotating, the circumferential side surface was pressed against the circumferential surface of the roll to give a polishing grain substantially parallel to the circumferential direction of the roll.

The overall evaluation was the same as in Example 1.

[0079]

[Table 4] From these results, in the invention examples D01 to D08, the invention rolls A01 to A0 of the first embodiment can be applied to the curved rolls of the first to fifth stands.
It was found that a cross-polished grain having an inclination angle and roll roughness almost the same as those of No. 8 can be provided, and polishing unevenness does not occur.

In Invention Examples D01 to D08, the glossiness of the steel sheet was better than that of Comparative Example D11 and Conventional Example D12, and neither uneven gloss nor meandering occurred. The reason why the results of Inventive Examples D1 to D08 were obtained is the same as that of A01 to A08 of Example 1 described above, and therefore the description thereof is omitted.

[0081]

As described above, according to the polishing method of the present invention, it is possible to simply and uniformly move the grindstone at least once in the axial direction of the roll, and to easily obtain a uniform cross-polishing pattern without polishing unevenness. Can be applied to a rolling roll. Further, according to the rolling roll polished by the polishing method of the present invention, meandering does not occur during rolling, and it is possible to obtain a high-gloss metal plate without uneven gloss.

[Brief description of drawings]

1 (a), 1 (b), and 1 (c) are views for explaining a roll polishing method of the present invention, which is a partial plan view showing a contact state between a grindstone and a flat roll. , Fig. 1 (a)
2B is a partial cross-sectional view taken along the line BB of FIG.

FIG. 2 is a plan view showing a direction of a peripheral velocity vector of a grindstone on a contact surface between the grindstone and a roll.

FIG. 3 is a schematic development view of the surface of the roll showing the inclination angle of the cross-polished mesh applied by the roll polishing method of the present invention.

4 (a) and 4 (b) are plan views showing a contact state between a grindstone and a curved roll in the roll polishing method of the present invention, and B′-B ′ in FIG. 4 (a). FIG.

FIG. 5 is a partial cross-sectional view showing an inclining direction of a shaft 2A of a grindstone for explaining a preferable roll polishing method of the present invention.

6 (a) and 6 (b) are the grinding surface of the grindstone when the offset amount X of the grindstone 2 is set to 1/2 or more of the inner diameter of the grindstone 2 and less than 1/2 of the outer diameter. FIG. 3 is a schematic plan view showing a contact state between a roller and a roll, and a front view showing a worn state of a grindstone after being used in the contact state.

FIG. 7 is a graph showing the influence of the outer peripheral speed of the grindstone / the outer peripheral speed of the roll on the inclination angle of the cross-polished grain.

FIG. 8 is a partial cross-sectional view showing a contact state between the polishing surface of the grindstone and the roll when the inclination angle of the axis of the grindstone is slightly increased in the polishing method of the present invention.

FIG. 9 is a diagram for explaining a conventional polishing method,
FIG. 9A is a partial cross-sectional view showing the contact point between the polishing surface of the grindstone and the roll, and FIG. 9B is a schematic plan view showing the contact point between the polishing surface of the grindstone and the roll.

FIG. 10 is a schematic development view of a roll surface showing an inclination of roll polishing stitches applied by a conventional polishing method.

[Explanation of sign]

1 Roll for rolling (roll) 1A Roll axis 1B Roll rotation direction 1N Roll normal 2 Hollow disk-shaped grinding wheel (grinding wheel) 2A Grinding wheel axis 2B Grinding wheel rotating direction 2C Grinding wheel moving direction O Grinding surface of grinding wheel Center of the 2D Line that passes through the center of the grinding surface of the 2D grindstone and divides the grindstone into phantom planes including the circumference of the roll 3L, 3R Contact surface between the grinding surface of the grindstone and the roll 4L, 4R Between the grindstone and the roll Gap X Offset amount θ ₁ , θ ₂ Angles of outer peripheral velocity vector and inner peripheral velocity vector of the grindstone on the contact surface between the grindstone and the roll with the circumferential direction of the roll θ ⁺ , θ ⁻ One inclination angle of the cross grind and the other Tilt angle

Front page continued (72) Inventor Hajime Hajime 1 Kawasaki-cho, Chuo-ku, Chiba, Chiba Prefecture, Kawasaki Steel Corporation Technical Research Institute (72) Inventor Yasuri Tasawa 1 Kawasaki-cho, Chuo-ku, Chiba Prefecture Kawasaki Steel Stock (56) References JP-A-7-88514 (JP, A) JP-A-7-265912 (JP, A) JP-A-8-267109 (JP, A) JP-A-7-112204 (JP , A) JP-A-4-201171 (JP, A) JP-A-8-57755 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) B21B 28/04 B21B 27/00 B21B 28/02 B24B 5/37

Claims (5)

(57) [Claims] 1. A hollow disk-shaped grindstone is used, and while the grindstone is being rotated, it is brought into contact with a rotating rolling roll, and is further moved in the axial direction of the rolling roll to polish the rolling roll. In this case, when the offset amount of the grindstone is more than 0 and less than 1/2 of the outer diameter of the grindstone, and the grindstone is equally divided by the plane including the circumference of the rolling roll, the grindstone and the rolling roll are A method for polishing a rolling roll, characterized in that the contact surfaces are present on both sides of the bisector, and the outer peripheral speed of the grindstone is 3 times or more the outer peripheral speed of the rolling roll. 2. A hollow disk-shaped grindstone is used, and while the grindstone is being rotated, it is brought into contact with a rotating rolling roll, and is further moved in the axial direction of the rolling roll to polish the rolling roll. In this case, when the offset amount of the grindstone is more than 0 and less than 1/2 of the outer diameter of the grindstone, and the grindstone is equally divided by the plane including the circumference of the rolling roll, the grindstone and the rolling roll are The contact surface exists on both sides of the bisector, and the method of polishing a rolling roll, characterized in that the grain size of the abrasive grains on the inner peripheral side of the grindstone is larger than the grain size of the abrasive grains on the outer peripheral side. . 3. The rotation axis of the grindstone is inclined toward the moving direction so that the surface pressure of the contact surface in the front of the moving direction of the grindstone is higher than the surface pressure of the contact surface in the rear in the moving direction of the grindstone. The method of polishing a rolling roll according to claim 1 or 2, wherein 4. The method of polishing a rolling roll according to claim 1, wherein the upper limit of the offset amount of the grindstone is less than 1/2 of the inner diameter of the grindstone. 5. The grain size of the abrasive grains of the grindstone is # 100 to # 400.
Polishing method for rolling rolls according to claim 1 or et 4, characterized in that a.