JP2004106060A - Method for grinding rolling roll for cold-rolling stainless steel sheet and rolling roll - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinding method of a roll for cold-rolling a stainless steel sheet by which a uniform cross ground mark without irregular grinding is imparted to the peripheral surface of the roll easily and efficiently and a rolling roll for cold-rolling the stainless steel sheet with which high gloss stainless steel sheet without irregular gloss is obtained and stable rolling is enabled. <P>SOLUTION: In the grinding method of the rolling roll for cold-rolling the stainless steel sheet, by this method, the offset amount of a whetstone is controlled to > 0 to < 1/2 of the outside diameter of the whetstone and, when bisecting the whetstone by a plane containing the circumference of the rolling roll, the contact surface of the whetstone with the rolling roll is present on both sides of the internal bisector. The rolling roll for cold-rolling the stainless steel sheet is the roll to which the cross ground mark is imparted by this grinding method of the rolling rolls. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention is a rolling roll used when cold rolling a stainless steel sheet and a polishing method therefor, wherein the intermittent polishing meshes (hereinafter, referred to as slanting lines) which are inclined in opposite directions to the circumferential direction of the rolling roll. And a polishing method therefor.

  On the metal plate surface after cold rolling, there are micro defects having a depth of about several μm called oil pits and micro defects having a depth of about 1 μm due to the transfer of the polished eyes of the roll called scratches. This causes the surface gloss to decrease. Therefore, various rolling methods have been proposed to smooth the surface of the metal plate during cold rolling and to suppress the occurrence of micro defects called oil pits and scratches. It has been proposed to apply eyes to a rolling roll (hereinafter, also simply referred to as a roll) to obtain a high-gloss metal plate having a small surface roughness.

For example, Japanese Patent Application Laid-Open No. 8-267109 discloses that a lapping film is applied to a roll with a cross-polished grain inclined at an angle of 30 ° or more with respect to the circumferential direction, and a cold-rolled steel sheet is rolled using this roll, thereby providing excellent gloss. It is disclosed that a metal plate is obtained (Patent Document 1).

Further, Japanese Patent Application Laid-Open No. 5-253604 discloses that a regular roll grinder is used to control the rotation speed of a work roll and the feed speed of a grindstone to give a spiral mark-shaped abrasive to the roll. There is disclosed a cold rolling method for obtaining a metal plate having excellent gloss by using the same (Patent Document 2).

Further, in Japanese Patent Application Laid-Open No. 7-265912, as shown in FIGS. 9 (a) and 9 (b), a disc-shaped (including a hollow disc-shaped (also called cup-shaped)) grindstone 20 is used. The offset amount of X is X, and the inclination angle with respect to the normal 10N of the roll is φ, and one end P of the rotated grindstone 20 is brought into contact with the rotating roll surface, and the grindstone 20 is relatively moved in the direction of the roll axis 10A. As shown in FIG. 10, there is disclosed a roll polishing method for providing a circumferential surface of the roll 10 with a polishing grain inclined to one side with respect to the circumferential direction of the roll, and a rolling method using the roll ( Patent Document 3).
JP-A-8-267109 JP-A-5-253604 JP-A-7-265912

  However, the polishing method disclosed in Japanese Unexamined Patent Application Publication No. 8-267109, which provides a cross-polishing line with a wrapping film, moves the wrapping film in the axial direction of the roll while pressing the wrapping film against the roll to give a slight vibration in the axial direction of the roll. Because the control is complicated and the abrasive grains of the wrapping film are easily worn out, it is necessary to frequently change the wrapping film, the polishing efficiency is poor, and the wrapping film is caused to vibrate in the axial direction of the roll. As a result, polishing unevenness (polishing pattern on appearance and unevenness of roll surface roughness) is likely to occur on the peripheral surface of the roll, and there has been a problem that a metal plate rolled using this roll has uneven gloss.

  In the polishing method for imparting a spiral abrasive grain disclosed in Japanese Patent Application Laid-Open No. 5-253604, for example, when imparting a 30 ° inclined abrasive grain, the grindstone is rolled at a high speed of 0.68 times the outer peripheral speed of the roll. Since it is moved in the axial direction, there is a problem that polishing failure called "hitting" is likely to occur, and there is a problem that remarkable polishing unevenness occurs, and gloss unevenness is clearly transferred to a metal plate rolled using this roll. However, there was a problem that the product was not produced due to uneven gloss.

In addition, in the polishing method disclosed in Japanese Patent Application Laid-Open No. 7-265912, only a polishing grain inclined only to one side with respect to the circumferential direction can be applied to the roll, and when this rolling roll is used, meandering occurs during rolling. This causes a problem that a rolling trouble occurs.

Accordingly, an object of the present invention is to solve the above-mentioned problems in the roll polishing method of the prior art, and to easily and efficiently apply a uniform cross-polished stitch without uneven polishing to the peripheral surface of the roll. To provide a rolling roll for cold rolling of a stainless steel plate capable of obtaining a high-gloss stainless steel plate without uneven gloss and capable of stable rolling, and a method for polishing a rolling roll for cold rolling of stainless steel It is in.

  The present invention uses a hollow disk-shaped whetstone, while rotating the whetstone, while contacting the roll for rotation, and further relatively moving in the axial direction of the roll for polishing the roll for roll When the offset amount of the whetstone is greater than 0 and less than 1/2 of the outer diameter of the whetstone, and when the whetstone is equally divided on a surface including the circumference of the rolling roll, contact between the whetstone and the rolling roll A method for polishing a rolling roll for cold-rolling a stainless steel sheet, characterized in that surfaces are present on both sides of the bisector.

  The present invention is also a method for polishing a rolling roll for cold rolling a stainless steel plate, wherein the upper limit of the offset amount of the grindstone is preferably less than 1/2 of the inner diameter of the grindstone. Further, in the present invention, it is preferable that the outer peripheral speed of the grinding wheel is three times or more the outer peripheral speed of the rolling roll.

In the present invention, it is preferable that the grain size of the abrasive grains on the inner peripheral side of the grinding wheel is larger than the grain size of the abrasive grains on the outer peripheral side. In the present invention, it is preferable that the grain size of the abrasive grains of the whetstone is # 100 to # 400.

Further, the present invention is a rolling roll provided with a cross-polishing line by a method for polishing a rolling roll for cold rolling any of the above stainless steel plates.

According to the polishing method of the present invention, a uniform cross-polished stitch without polishing unevenness can be easily applied to the rolling roll simply by moving the grindstone at least once in the axial direction of the rolling roll. Further, according to the rolling roll of the present invention, a meandering does not occur when rolling is performed, and a high gloss stainless steel sheet without gloss unevenness can be obtained.

The method of polishing a rolling roll (hereinafter, also simply referred to as roll 1) for cold rolling a stainless steel sheet according to the present invention is a hollow disk-shaped grinding wheel (hereinafter, simply referred to as a grinding wheel) used for mirror-finishing the roll. This is a polishing method completed by focusing on (1), and simply and efficiently giving a cross-polished stitch to the roll without polishing unevenness.

Hereinafter, the method for polishing a roll of the present invention will be described in detail with reference to the drawings.

First, using FIG. 1 to FIG. 3, a case where a cross-polished stitch is applied to a flat roll (a roll 1 formed by a surface obtained by rotating a straight line parallel to the roll axis around the roll axis). However, in the present invention, a cross-polished stitch may be applied to a roll with a curve (the roll 1 whose peripheral surface is formed by rotating a curve along the axis of the roll around the axis of the roll). Since it is possible, the polishing method in this case will be described later.

1 (a), 1 (b), and 1 (c) are views for explaining a method of polishing the roll 1 of the present invention, and are partial plan views showing the contact state between the grindstone 2 and the roll 1, respectively. FIG. 1A is a partial sectional view taken along line BB of FIG. 1A, and FIG. 1A is a sectional view taken along line AA of FIG. FIG. 2 is a plan view showing the direction of the circumferential velocity vector of the grindstone on the contact surface between the grindstone 2 and the roll 1. FIG. 3 is a developed schematic view of the surface of the roll 1 showing the inclination angle of the cross-polished eyes provided by the method of polishing the roll 1 of the present invention.

Here, reference numeral 1A denotes a rotation axis of the roll 1 (hereinafter simply referred to as a roll axis or axis), 1B denotes a rotation direction of the roll 1, 1N denotes a normal line of the roll 1, and reference numeral 2A denotes a rotation axis of the grinding wheel 2 (hereinafter simply referred to as a grinding wheel). 2B is the rotational direction of the grindstone 2, 2C is the moving direction of the grindstone 2, 2D is a line equally dividing the contact area between the grindstone 2 and the roll 1 in the direction of the roll axis 1A), 3L, 3R Is a contact surface between the grindstone 2 and the roll 1. If the whetstone 2 is equally divided on a virtual surface including the circumference of the roll 1, the dividing line becomes exactly 2D. X is the offset amount, θ1 and θ2 are the directions of the outer peripheral velocity vector of the grindstone 2 and the inner peripheral velocity vector of the grindstone 2 on the contact surface between the grindstone 2 and the roll 1, respectively, and θ ⁺ and θ ⁻ One inclination angle and the other inclination angle of the applied cross polishing eye.

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

At this time, in the method for polishing the roll 1 according to the present invention, as shown in FIGS. 1A, 1B, and 1C, the offset amount X of the grindstone 2 exceeds 0 and the outer diameter of the grindstone 2 The polishing surface 3L, 3R of 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 direction of the roll axis 1A is brought into contact with the roll 1 to give a cross-polished stitch. The feature is that In the figure, 3L and 3R are contact surfaces between the grindstone 2 and the roll 1.

Here, in the roll polishing machine provided with the roll 1 and the grindstone 2, in order to bring the polished surface of the grindstone 2 into contact with the roll 1 as described above, the polished surface of the grindstone 2 is directed to the roll 1, and After the axis 2A is made to coincide with the roll normal 1N, it can be easily made by shifting the axis 2A in parallel by the offset amount X so that the polished surface of the grindstone 2 comes into contact with the roll 1.

In the above-mentioned roll polishing machine, the polishing surface of the grindstone 2 is turned to the roll 1 and the axis 2A of the grindstone 2 is made to coincide with the roll normal, and then shifted in parallel by the same offset amount as described above, so that the axis of the grindstone 2 is changed. By making the polished surface of the grindstone 2 and the roll 2 come into contact on both sides of the surface perpendicular to the axis 1A of the roll 1 passing through the roll 2A, the same applies to the roll polishing method of the present invention described above. Cross polishing can be applied to the roll.

Next, the operation of the method for polishing the roll 1 of the present invention, which can easily and efficiently impart a uniform cross-polished stitch without polishing unevenness to the roll 1, will be described below. In the method of polishing the roll 1 according to the present invention, as shown in FIG. 2, the polishing surfaces 3L and 3R of the grindstone 2 are applied to the roll 1 on both sides of a line 2D equally dividing the contact area between the grindstone 2 and the roll 1 in the roll axis direction. In contact. In FIG. 2, θ1 and θ2 are the directions of the outer peripheral velocity vector of the grindstone and the directions 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 parallel to 1B.

As shown in FIG. 2, the directions of the circumferential velocity vectors of the grindstone 2 on the contact surfaces 3L and 3R between the grindstone 2 and the roll 1 are inclined in directions opposite to each other with respect 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 inclined upward and downward in the drawing, and the direction between the outer peripheral edge and the inner peripheral edge of the other contact portion 3R. The direction of the peripheral velocity vector of the grindstone 2 is inclined downward and to the right in the drawing.

Therefore, in the method for polishing a roll according to the present invention, the grindstone 2 is moved at least once relatively in the direction of the axis 1A of the roll 1, and as shown in FIGS. Cross polishing stitches, which are intermittent polishing stitches inclined at θ ⁺ and θ ^{− in} directions opposite to each other with respect to the circumferential direction, can be provided on the circumferential surface of the roll 1.

In the method of polishing the roll 1 of the present invention, it is not necessary to apply the micro-vibration to the grindstone 2 in the direction of the axis 1A of the roll 1, and the grindstone 2 rotates, so that it is hard to cause clogging, and it is not necessary to frequently change the grindstone 2. This makes it possible to efficiently provide a uniform cross-polished surface without polishing unevenness to the roll peripheral surface. In the present invention, moving the grindstone 2 relatively means rotating the roll 1 and moving the rotating grindstone 2 in the direction of the axis 1A of the roll 1 or rotating the grindstone 2 and rotating the roll 1 It is to move in the direction of the axis 1A or to move both the roll 1 and the grindstone 2 in opposite directions. If the relative movement speed of the grindstone 2 is set sufficiently small with respect to the outer peripheral speed of the grindstone 2, the inclination angle of the cross-polishing marks theta ^+, theta ^- no significant effect on the.

According to the method of polishing the roll 1 of the present invention, if the relative movement speed of the grindstone 2 is set to a low speed, for example, about 1 mm / sec, a polishing defect called “hitting” does not occur.

(3) If a grindstone having a finite width is used and the roll is moved in the axial direction at a finite speed while the roll is polished at a finite grindstone rotation speed, the polishing lines are distributed in a range different from right to left in principle as shown in FIG. By increasing the number of rotations of the grindstone, the angle formed by the left and right polished stitches with respect to the circumferential direction approaches a state of being symmetrical as shown in FIG. 3B, but does not become strictly symmetrical. Also, by reducing the width of the grindstone from the state of FIG. 3D, the distribution of the polishing angle approaches the state where the distribution of the polishing angle becomes narrow, although the angle differs between the left and right as shown in FIG. 3C. , Not exactly parallel. Furthermore, by increasing the number of revolutions of the grindstone using a narrower grindstone, the angle approaches the state where the angle is bilaterally symmetric and the polishing lines are parallel, as shown in FIG. Not be.

In the present invention, in any of the embodiments, the polishing is performed at a finite grinding wheel rotation speed using a finite width grinding wheel, so that the polishing is performed in a state shown in FIG. 3D, and strictly, FIGS. 3A to 3C. However, it can be adjusted to a state close to that, and even in the state of FIG. 3D, a gloss improving effect can be sufficiently obtained while preventing uneven gloss.

The reason why the offset amount X of the grindstone 2 in the method for polishing the roll 1 of the present invention is set to be 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 circumferential velocity vector of the grindstone 2 on the contact surfaces 3L and 3R shown in FIG. The average value of the inclination angle is less than 5 °, and the effect of improving the gloss becomes insufficient. On the other hand, when the offset amount X of the grindstone 2 is set to 1/2 of the outer diameter of the grindstone 2, the contact shown in FIG. The direction of the circumferential velocity vector of the grindstone 2 on the surfaces 3L and 3R is almost parallel to the axis 1A of the roll 1, and the average value of the inclination angle of the polished eyes exceeds 85 °. This is because the effect of improving the gloss of the eyes cannot be maintained.

Note that the offset amount X is the distance between the axis 1A of the roll 1 and the axis 2A of the grindstone 2. In the roll polishing machine, the axis 2A of the grindstone 2 is made coincident with the normal 1N of the roll 1, and then the above description is made. As described above, it is general that the grindstone 2 is set to be shifted in parallel by the offset amount X.

In the above description, the whetstone 2 is relatively moved in the direction of the axis 1A of the roll 1 to give the cross-polished stitch to the flat roll. However, in the method for polishing the roll 1 of the present invention, FIG. a), a cross-polished stitch can also be given to a roll with a curve which shows the change in diameter in an enlarged manner in FIG. 4 (b).

When imparting a cross-polishing line to a roll with a curve according to the present invention, the grindstone 2 was attached to a roll grinder (not shown), the roll 1 was attached to the roll grinder, and the grindstone 2 was rotated while rotating. When the roll is brought into contact with the roll 1 and relatively moved in the axial direction of the roll 1, similarly to the case where a cross roll is given to the flat roll, as shown in FIGS. The offset amount of the grinding wheel 2 is set to be more than 0 and less than 1/2 of the outer diameter of the grinding wheel 2, and the polishing surface of the grinding wheel 2 on both sides of a line 2D that equally divides the contact area between the grinding wheel 2 and the roll 1 in the direction of the roll axis 1A. When the grindstone 2 is moved in the direction of the roll axis 1A relative to the curve while making contact with the grindstone 1, the roll can be easily and efficiently provided with a uniform cross-polished stitch.

FIGS. 4 (a) and 4 (b) show the contact state between the grindstone 2 and the roll 1 in the case where a cross-polished stitch is provided to a roll with a curve, and FIGS. The same components as those in (c) are denoted by the same reference numerals, and description thereof is omitted. FIG. 4B is a partial cross-sectional view taken along the line B′-B ′ in FIG.

The difference between the case in which the cross-polished stitch is applied to the flat roll and the case in which the cross-polished stitch is applied to the curved roll is that when the grindstone 2 is moved in the direction of the axis 1A of the roll 1, in the former, the grindstone 2 attached to the roll grinder is used. The axis of the grindstone 2 is held at right angles to the axis 1A of the roll 1 so that the axis 2A of the roll 1 is parallel to the normal 1N of the roll 1, but in the latter case, the grindstone attached to the roll grinder is used. The angle between the axis 2A of the grindstone 2 and the axis 1A of the roll 1 is changed so that the axis 2A of the roller 2 is parallel to the normal 1N of the roll 1 according to the roll curve.

  By the way, when the present inventors applied the cross-polished stitch to the peripheral surface of the roll 1 by the above-described method for polishing the roll 1 of the present invention, the cross-polished stitch was applied on the contact surface 3L in front of the moving direction 2C of the grindstone 2. It was noticed that the depth of the polished line was shallower than the polished line provided on the contact surface 3R behind the grinding wheel 2 in the moving direction 2C. The cause is that the surface pressures at the contact surfaces 3L and 3R between the grindstone 2 and the roll 1 are almost equal, and the polishing line applied at the contact surface 3L at the front in the moving direction 2C of the grindstone 2 is polished at the rear contact surface 3R. That is because

The reason why the surface pressures at the contact surfaces 3L and 3R become substantially equal is that, in the present invention, the offset amount X of the grindstone 2 is set to more than 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 polished surfaces of the grindstones 2 on both sides of a line 2D equally dividing the contact area in the direction of the roll axis 1A into contact with the roll 1, the axis 2A of the grindstone 2 is made to coincide with the normal 1N of the roll 1 in a roll polishing machine. After that, since the offset amount X of the grindstone 2 exceeds 0 and is less than 1/2 of the outer diameter of the grindstone 2, the polished surface of the grindstone 2 is brought into contact with the roll 1, as shown in FIGS. 1 (a) to 1 (c). In both cases where the cross-polishing line is provided on the flat roll shown, and where the cross-polishing line is provided on the curved roll shown in FIGS. 4 (a) and 4 (b), the polishing surface of the grindstone 2 and the roll 1 Is substantially parallel to the peripheral surface of.

Therefore, in the polishing method of the roll 1 of the present invention, as shown in FIG. 5, the surface pressure of the contact surface 3L at the front of the moving direction 2C of the grindstone 2 is changed to the surface of the contact surface 3R at the rear of the moving direction 2C of the grindstone 2. The axis 2A of the grindstone 2 is tilted by an angle α with respect to the normal 1N of the roll 1 in the moving direction 2C so as to be higher than the pressure, so that the polishing contact provided on the front contact surface 3L, It is preferable that the depth after the surface is polished on the surface 3R and the depth thereof becomes substantially equal to the depth of the polished line provided on the rear contact surface 3R. The reason for this is that when a cross-polished stitch having a depth substantially equal to one side and a cross-polished stitch inclined to the other side is applied to the roll peripheral surface, a cross-polished stitch having a different depth is applied to the roll peripheral surface. This is because it was found from the experimental results that the polished line had a longer life than that of the roll obtained and that the gloss improving effect could be maintained even when the pressure extension was increased.

FIG. 5 is a partial cross-sectional view showing a polishing state when the axis 2A of the grindstone is inclined, and passes through the axis 2A of the grindstone 2 in FIG. This is a state when viewed in a cross section parallel to 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 polished surface of the grindstone 2 is shown. The grinding wheel shaft 2A passes through this O.

The inclination angle α of the grinding wheel axis 2A with respect to the roll normal 1N is within a range in which the grinding wheel 2 can maintain contact at the contact surfaces 3L and 3R on both sides due to elastic deformation, and is provided at the contact surface 3L in front of the moving direction 2C of the grinding wheel 2. The depth of the polished eye after polishing on the rear contact surface 3R may be substantially equal to the depth of the polished eye provided on the rear contact surface 3R. The inclination angle α can be determined by the material of the rolling roll 1, the grain size of the grindstone, the material of the grindstone, and the like, and can be 0.01 to 0.5 °.

In these figures, the moving direction 2C of the grindstone 2 is set to the left direction, but may be set to the opposite right direction. In this case, the contact surface in front of the moving direction of the grindstone 2 becomes 3R, and the moving direction of the grindstone 2 is changed. The contact surface behind is 3L. In these figures, the grindstone 2 is moved in the direction of 2C, but the roll 1 may be moved in the direction opposite to 2C.

By the way, in the roll polishing method of the present invention, it is preferable that the upper limit of the offset amount X of the grindstone 2 be less than 1/2 of the inner diameter of the grindstone 2. The reason for this is that, when the upper limit of the offset amount X of the grindstone 2 is set to be equal to or more than の of the inner diameter of the grindstone 2 and less than 1/2 of the outer diameter, as shown in FIGS. 6 (a) and 6 (b). In addition, since the polished surface of the grindstone 2 in a range of not less than の of the inner diameter of the grindstone 2 and the offset amount X does not contact the roll 1, the wear on the polished surface of the grindstone 2 is likely to be non-uniform. In the polishing of a wide large-diameter roll, truing of the grindstone 2 (to flatten a deformed grindstone surface as shown in FIG. 6B) and dressing (sharpening) are required for each predetermined polishing area. This is because the polishing operation efficiency is reduced and the polishing cost is increased.

In the polishing method of the present invention, the relationship between the outer peripheral speed of the grindstone 2 and the outer peripheral speed of the roll 1 is important, and it is preferable that the outer peripheral speed of the grindstone 2 be at least three times the outer peripheral speed of the roll 1. The reason for this is, for example, that the offset amount is set so that the angle of the outer peripheral velocity vector of the grinding wheel 2 with respect to the circumferential direction is 10 ° on the contact surface between the grinding wheel 2 and the roll 1. If the outer peripheral speed is less than three times the outer peripheral speed of the roll 1, as can be seen from FIG. 7, one inclination angle of the cross polishing becomes larger than 15 °, which is different from the target polishing angle by 50%. This is because the gloss of the metal plate may not be as intended. Even when the angle of the outer peripheral velocity vector with respect to the circumferential direction changes, if the angle is set to three times or more, a cross-polished stitch where the gloss of the metal plate becomes good can be obtained.

  In the method for polishing the roll 1 of the present invention, it is preferable that the grain size of the abrasive grains on the inner peripheral side of the grindstone 2 be larger than the grain size of the abrasive grains on the outer peripheral side. The reason is as follows.

In the preferred polishing method of the present invention, the grinding wheel 2 is designed such that the surface pressure of the contact surface 3L at the front of the movement direction 2C of the grinding wheel 2 during polishing is higher than the surface pressure of the contact surface 3R at the rear of the movement direction 2C of the grinding wheel 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 generated. In the rear of the moving direction 2C of the grindstone 2, the outer peripheral side of the grindstone 2 contacts the roll 1. A gap 4R is generated, and the outer peripheral side of the contact surface 3L in front of the moving direction 2C of the grindstone 2 makes strong contact with the roll 1. On the other hand, in the contact surface 3R behind the moving direction 2C of the grindstone 2, Conversely, the inner peripheral side of the grindstone makes strong contact with the roll 1. 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.

Therefore, when the grain size of the abrasive grains on the inner peripheral side and the outer peripheral side of the grindstone 2 is the same, the number of grooves per unit length in the direction of the roll axis 1A provided on the contact surface 3R is equal to the number of grooves on the contact surface 3L. It was less than the number of grooves provided. Then, 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 made smaller than that on the outer peripheral side. When the cross-polished stitch is applied to the roll, the number of grooves per unit length in the roll axis direction provided on the inner peripheral side of the grindstone 2 and the number of grooves provided on the outer peripheral surface of the grindstone 2 are substantially the same. This is because, as a result of rolling with these rolls, it was found that the effect of the cross-polished eyes could be further maintained.

The difference in the particle size of the abrasive grains between the inner peripheral side and the outer peripheral side of the grindstone 2 is determined by the pressure difference between the inner peripheral side and the outer peripheral side of the grindstone 2 and the roll material, etc., in one side per unit length in the roll shaft 1A direction. The number of polishing grooves inclined to the other side and the number of polishing grooves inclined to the other side may be determined to be substantially the same.

Here, it is preferable that the grain size of the abrasive grains of the grindstone 2 used in the present invention is # 100 to # 400.

The reason for this is that if the grain size of the abrasive grains of the grindstone 2 is less than # 100, the polishing grain applied to the roll becomes coarse, causing seizure and uneven gloss. Is more than # 400, the effect of smoothing the surface of the metal plate is reduced, and the effect of improving the gloss of the cross-polished eyes is reduced. For this reason, it is preferable that the grain size of the abrasive grains of the grindstone 2 used in the present invention is # 100 to # 400.

The grain size of abrasive grains of # 100 to # 400 is defined as the grain size of diamond and cubic boron nitride (also called CBN) abrasive grains (JIS B4130). 100/120 to 325/400 means that the particle size exceeding this range is too small to be suitable for giving a polishing grain to the roll surface, while the particle size below this range is too large. As a result, the polished eyes may be too sparse and the metal plate may not have sufficient gloss.

  The material of the abrasive grains of the grindstone 2 used in the present invention can also be diamond or CBN which is generally used. When CBN is used to give a cross-polished stitch to a steel roll, diamond and steel Good because it does not seize like a roll. Further, the binder for holding the abrasive grains and forming the abrasive grain layer portion can be resin or vitrified, and the concentration of the abrasive grains can be in the range of 50 to 200. When the concentration of the abrasive grains is set to 75 or 100, it is preferable because a polishing grain having a uniform depth can be given to the roll surface.

  Next, a roll provided with a cross-polishing line by the polishing method of the present invention will be described.

The cross-polished stitches provided on the roll peripheral surface by the polishing method of the present invention are uniform without polishing unevenness, and therefore, a stainless steel plate can be rolled without meandering for the following reasons, and high gloss with no gloss unevenness can be obtained. It is thought that a stainless steel plate can be obtained.

(1) Since the cross-polishing lines are inclined in the opposite direction to the longitudinal direction of rolling in the roll bite, the thrust force acting on the stainless steel plate can be offset, and the stainless steel plate can be rolled stably without meandering it can. (2) Since the cross-polishing line is inclined with respect to the longitudinal direction of the rolling, the polishing line is substantially parallel to the circumferential direction of the roll, and the polishing line is more polished than the case where the roll surface is a mirror surface. Since the stainless steel sheet has a large smoothing effect on the surface of the stainless steel sheet obtained by rubbing in a roll bite and can suppress the occurrence of micro defects, a high gloss stainless steel sheet can be obtained. (3) Rolling is performed with a roll provided with uniform cross-polishing lines without polishing unevenness, so that a stainless steel plate without gloss unevenness can be obtained.

Hereinafter, the present invention will be described in detail with reference to examples.

In Examples 1 to 3, a flat roll was provided with a cross-polishing line, and the flat roll was incorporated into the first to fifth stands of a cold tandem rolling mill or a rolling stand of a 12-stage cluster type rolling mill. In Example 4, And the rolls with the curves are incorporated into the first to fifth stands of the cold tandem rolling mill, and the curves are sequentially shifted from the first to the fifth stands by a half amplitude (phase 0 to 200, 200, 100, 100, 50 μm) per radius. π) It is a sine curve, and the roll with the curve is provided with a cross abrasive grain.
[Example 1]
Rolls for rolling incorporated in the first to fifth stands made of semi-high speed steel having a diameter of 600 mm are polished under the polishing conditions shown in Table 1, and then incorporated into a cold tandem rolling mill consisting of five stands as a pair of upper and lower, and hot-rolled.・ A SUS 430 ferritic stainless steel sheet with a thickness of 4.0 mm after annealing and pickling was rolled to a thickness of 1.5 mm. In addition to memorizing the total pressure extension after the rolls were incorporated into the cold tandem rolling mill, the obtained steel sheet was further subjected to annealing, pickling, and temper rolling, and the glossiness of the steel sheet at the above total pressure extension ( GS 20 °).

Table 1 shows the polishing conditions, the inclination angle of the polishing line, the roll roughness Ra after polishing (arithmetic mean roughness of JIS B 0601: hereinafter simply referred to as roughness), the presence or absence of unevenness of the roll after polishing, and the time of rolling. The presence or absence of meandering, the total pressure extension, and the gloss (GS 20 °) of the steel sheet at this total pressure extension are also shown.

The inclination angle of the polishing marks of rolls theta ^+, theta ^-, when the theta ⁺ is inclined to face the upper right from the lower left as shown in Figure 3, toward the upper left from the lower right a case where inclined manner theta ^- and then, is the angle formed between the circumferential 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 a mineral rolling oil of 20 cSt (40 ° C.) in a 5% emulsion state.

In the invention examples A01 to A08, a CBN wheel (shape 6A2 of JIS B 4131) was used as a hollow disk-shaped grindstone. When the offset amount is more than 0 and less than 1/2 of the outer diameter of the grindstone, and the grindstone is equally divided on the surface including the circumference of the roll, the grindstone should be such that the contact surface between the grindstone and the roll exists on both sides of the bisector. Was brought into contact with the roll and moved once (one way) in the axial direction of the roll to give a cross-polished stitch to the roll peripheral surface.

In Comparative Example A09, the offset amount of the grindstone was set to 0, and the other conditions were the same as those of Invention Example A01, and polishing lines substantially parallel to the circumferential direction were provided. In Conventional Example A10, a lapping film was used, and the lapping film was vibrated at 5 Hz in the axial direction of the roll to give a cross-polished stitch. In Conventional Example A11, a spiral grind was provided by using a flat grindstone, making the outer peripheral speed of the roll slower than the invention example, and increasing the moving speed of the grindstone. In Conventional Example A12, one end of a hollow disk-shaped grindstone was brought into contact with the grindstone having the same grain size and shape as in Example A01, and only one of the grindstones was inclined.

Comprehensive evaluation was performed as follows.

No roll unevenness and meandering during rolling occur, and 10 rolls can be provided with a cross-polished stitch without truing and dressing, and the gloss (GS 20 °) of the steel sheet exceeds 880 at a pressure extension of 10 km. In the case, ○, cross polishing can be given to 10 rolls without truing and dressing, and when the glossiness (GS 20 °) of the steel plate is more than 880 with a pressure extension of more than 10 km, and ◎, △ Roll unevenness and meandering during rolling do not occur, and the glossiness is 880 or more at a pressure extension of 10 km, but the number of dressings is per roll, or the glossiness (GS 20 °) of the steel plate is pressure-extended It is assumed that the distance is more than 850 and less than 880 at 10 km. × indicates that the glossiness was less than 850, or that either the polishing unevenness of the roll or the meandering during rolling occurred.

From these results, it can be seen that in the invention examples A01 to A08, uneven roll polishing and meandering during rolling did not occur, and the glossiness of the steel sheet was better than that of the comparative example A09.

In the invention examples A01 to A08, the axis of the grinding wheel is oriented in 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 of the moving direction of the grindstone. In the invention example A02 inclined with respect to the normal, the life of the polished eyes is longer than that of the invention example A01, and the effect of improving the gloss of the cross-polished eyes can be maintained.

In the invention example A03 in which the offset amount of the grindstone was set to be equal to or more than 1/2 of the inner diameter of the grindstone, uneven wear occurs on the polished surface. However, in the invention example in which the offset amount of the grindstone was set to less than 1/2 of the inner diameter of the grindstone, dressing of the grindstone was unnecessary until the cross polishing stitch was applied to ten rolls, and the polishing cost was reduced. It was able to reduce more. In addition, in Inventive Example A01 in which the outer peripheral speed of the grindstone is set to be three times or more the outer peripheral speed of the roll and other conditions are the same as those of Inventive Example A04, the glossiness of the steel sheet is higher than that of Inventive Example A04. In addition, in Invention Example A05 in which the particle size of the abrasive grains on the inner peripheral side is larger than the particle size of the outer peripheral abrasive grains, and the axis of the grindstone is inclined with respect to the normal line of the roll toward the moving direction, the invention example is larger than the invention example A02. The glossiness of the steel sheet is well maintained even when the elongation is extended. In other words, the life of the polished eyes is long, and the effect of improving the glossiness of the cross polished eyes can be further maintained.

In the invention examples A01, A06, and A07 in which the grain size of the abrasive grains of the grindstone was # 100 to # 400, the glossiness of the steel sheet was better than that in the invention example A08 in which the grain size was out of the range and other conditions were the same. It is. The steel sheet obtained according to the invention example did not have uneven gloss.

On the other hand, in the conventional example A10 in which a lapping film is used and the lapping film is vibrated in the axial direction of the roll to provide a cross polishing grain, and in the conventional example A11 in which a flat grinding wheel is used and a spiral polishing grain is provided, In addition, polishing unevenness occurred, and gloss unevenness also occurred on the steel sheet, and the product was degraded. Further, in the conventional example A12 in which one end of the hollow disk-shaped grindstone was brought into contact and only one of the grindstones was provided with an inclined grinding line, meandering occurred during rolling, and the rolling had to be stopped.
[Example 2]
Rolls made of cold die steel with a diameter of 80 mm for polishing are polished under the polishing conditions shown in Table 2, and then incorporated in a 12-stage cluster type rolling mill as a pair of upper and lower parts. The material thickness after hot rolling, annealing and pickling A 3.0 mm SUS 304 austenitic stainless steel sheet was rolled to a thickness of 0.25 mm.

After storing the total pressure elongation after incorporating the rolls in the 12-stage cluster type rolling mill, the obtained steel sheet was further subjected to one pass of annealing, pickling, temper rolling, and buff polishing under the same conditions. The glossiness (GS 20 °) of the steel sheet at the total pressure extension was measured.

Table 2 shows the polishing conditions and the inclination angle of the polishing line, the roughness of the roll after polishing, the presence / absence of unevenness of the roll after polishing, the presence / absence of meandering at the time of rolling, the extension of the total pressure, and the glossiness of the steel sheet at the extension of the total pressure. (GS 20 °).

ロ ー ル Roll roughness was measured in the axial direction of the roll. In the 12-stage cluster type rolling mill, the rolling speed was set to 200 m / min, and the rolling was performed in 9 passes while supplying mineral oil having a viscosity of 3 cSt (40 ° C.) neat. In the invention examples B01 to B08, a CBN wheel (shape 6A2 of JIS B 4131) was used as a hollow disk-shaped grindstone. When the offset amount is more than 0 and less than 1/2 of the outer diameter of the grindstone, and the grindstone is equally divided on the surface including the circumference of the roll, the grindstone should be such that the contact surface between the grindstone and the roll exists on both sides of the bisector. Was brought into contact with a roll and moved once in the axial direction of the roll to give a cross-polished stitch.

In Comparative Example B09, the offset amount of the grindstone was set to 0, and the other conditions were the same as those of Invention Example B01, and polishing lines substantially parallel to the circumferential direction were provided. In Conventional Example A10, a lapping film was used, and the lapping film was vibrated at 8.5 Hz in the axial direction of the roll to give a cross-polished stitch. In Conventional Example B11, a spiral grind was provided by using a flat grindstone, making the outer peripheral speed of the roll slower than the invention example, and increasing the moving speed of the grindstone. In Conventional Example A12, one end of a hollow disk-shaped grindstone was brought into contact, and a grindstone having the same grain size and shape as in Example A01 was provided with a polished stitch on one side only.

Comprehensive evaluation was performed as follows.

No roll unevenness and no meandering during rolling, and the gloss of the steel sheet (GS 20 °) is 10 km for a pressure extension of 10 km. Is 850 if the length is more than 10 km and the table length is more than 919 and the back is 919 or more. △ is 10 km when the roll polishing unevenness and meandering during rolling do not occur and the glossiness (GS 20 °) of the steel sheet is 10 km. In this case, it is assumed that the value is not less than (front 800 / back 869) and less than (front 850 / back 919). × indicates that the gloss of the steel plate was less than (Table 800 / Back 869), or that either the polishing unevenness of the roll or the meandering during rolling occurred.

From these results, it can be seen that in Invention Examples B01 to B08, uneven roll polishing and meandering during rolling did not occur, and the glossiness of the steel sheet was better than that of Comparative Example B09.

Of the invention examples B01 to B08, the axis of the grindstone is oriented in 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 of the moving direction of the grindstone. In the inventive example B02 inclined with respect to the normal line, the glossiness of the steel sheet was kept good even when the total pressure extension was longer than that of the inventive example B01. In other words, the life of the polished eyes is long, and the effect of improving the gloss of the polished eyes can be maintained.

In addition, in the invention example B03 in which the offset amount of the grindstone was set to be equal to or more than の of the inner diameter of the grindstone, no significant uneven wear was generated on the polished surface of the grindstone even when the cross-polished stitch was applied to the two rolls. Since there was no need 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.

発 明 In addition, in the case of Invention Example B01 in which the outer peripheral speed of the grindstone is at least three times the outer peripheral speed of the roll and other conditions are the same as those of Invention Example B04, the steel sheet has higher gloss than Invention Example B04. Further, in the invention example B05 in which the particle size of the abrasive grains on the inner peripheral side is made larger than the particle size of the abrasive grains on the outer peripheral side, and the axis of the grindstone is inclined with respect to the normal line of the roll toward the moving direction, the invention example B02 The life of the polished eyes is long, and the effect of improving the glossiness of the cross polished eyes can be maintained.

Further, in Invention Examples B01, B06, and B07 in which the grain size of the abrasive grains of the grindstone was # 100 to # 400, the glossiness of the steel sheet was higher than that of Invention Example B08 in which the grain size was out of the range and the other conditions were the same. Good. And the gloss unevenness did not occur in the steel sheet obtained in the invention example.

On the other hand, in the conventional example B10 in which a lapping film was used and the lapping film was vibrated in the axial direction of the roll to provide a cross polishing grain, and in the conventional example B11 in which a flat grinding stone was used and a spiral polishing grain was provided, a roll was used. In addition, polishing unevenness occurred, and gloss unevenness also occurred on the steel sheet, and the product was degraded. Further, in the conventional example B12 in which one end of a hollow disc-shaped grindstone was brought into contact and only one of the grindstones was provided with an inclined polishing line, meandering occurred during rolling, and the rolling had to be stopped.
[Example 3]
Rolls for rolling incorporated in the first to fifth stands of the same material and dimensions as those of Example 1 and made of semi-high-speed steel having a diameter of 600 mm were polished under the polishing conditions shown in Table 3, and were cooled in a pair consisting of five stands as an upper and lower pair. The SUS 430 ferrite stainless steel with a material thickness of 2.0 mm after hot rolling, annealing and pickling was rolled into a tandem rolling mill to a thickness of 0.7 mm.

In addition to memorizing the total pressure extension after the rolls were incorporated into the cold tandem rolling mill, the obtained steel sheet was further subjected to annealing, pickling, and temper rolling, and the glossiness of the steel sheet at the above total pressure extension ( GS 20 °). Table 3 shows the polishing conditions, the angle of inclination of the polishing line, the roughness of the roll after polishing, the presence or absence of unevenness in polishing of the roll after polishing, the presence or absence of meandering during rolling, the total pressure extension, and the glossiness of the steel sheet at this total pressure extension. (GS 20 °).

ロ ー ル 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 the rolling was performed while supplying a mineral rolling oil of 20 cSt (40 ° C.) in a 5% emulsion state.

In Invention Examples C01 to C06, a CBN wheel (shape 6A2 of JISB4131) was used as a hollow disk-shaped grindstone, and the amount of offset of the grindstone when polishing the roll by rotating the grindstone while contacting the roll was rotated. Is greater than 0 and less than 1/2 of the outer diameter of the grindstone, and when the grindstone 2 is equally divided in the direction including the circumference of the roll 1 in the direction of the roll axis 1A, there are contact surfaces between the grindstone and the roll on both sides thereof. The grindstone 2 was brought into contact with the roll, and was moved once (one way) in the axial direction of the roll to give a cross-polished stitch on the roll peripheral surface. At that time, the inclination angle and the offset amount of the roll polishing line 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 Invention Example C01, and polishing lines substantially parallel to the circumferential direction were provided. As the conventional example C12, a cylindrical disc-shaped grindstone was used, and while rotating, the circumferential side face was pressed against the circumferential surface of the roll to give a polishing grain substantially parallel to the circumferential direction of the roll.

Comprehensive evaluation was performed as follows.

No roll unevenness, no meandering during rolling, and 10 rolls can be cross-polished without truing and dressing, and the gloss (GS 20 °) of the steel sheet exceeds 900 at a pressure extension of 20 km. In the case of ○, the glossiness (GS 20 °) of the steel sheet is more than 950 when the elongation is more than 20 km and it is ◎, and the △ indicates that the roll unevenness and meandering during rolling do not occur and the glossiness is the elongation. It was 900 or more at 20 km, but the number of times of truing and dressing was per roll, or the gloss (GS 20 °) of the steel sheet was 800 or more and less than 900 at 20 km of elongation. × indicates that the glossiness was less than 800, or that either the polishing unevenness of the roll or the meandering during rolling occurred.

From these results, it can be seen that in Invention Examples C01 to C06, uneven roll polishing and meandering during rolling did not occur, and the glossiness of the steel sheet was better than Comparative Example C11 and Conventional Example C12.

Further, as in Invention Examples C02 to C04 and C06, when the inclination angles of all the polishing meshes are in the range of 5 ° to 85 °, the invention samples C01 and C05 having the polishing meshes partially out of the range. The glossiness of the steel sheet is better than that.

In addition, in the invention example C05 in which the offset amount of the grindstone was set to be equal to or more than の of the inner diameter of the grindstone, uneven wear occurs on the polished surface. Therefore, it is necessary to dress the grindstone every time a roll is provided with a cross-polished stitch. However, in Invention Examples C01 to C04 and C06 in which the offset amount of the grindstone was set to less than half of the inner diameter of the grindstone, dressing of the grindstone was unnecessary until the ten rolls were provided with a cross-polished stitch, and the offset amount of the grindstone was reduced. The polishing cost was reduced as compared with the invention example C05 in which the inner diameter of the grinding wheel was 1/2 or more.
[Example 4]
The rolls of semi-high-speed rolls of 600 mm diameter to be installed from the first to the fifth stand are arranged in order from the upstream, and the curves are sequentially set as half amplitude (phase 0 to π) sine curves of 200, 200, 100, 100, and 50 μm per radius. After polishing under the polishing conditions shown in FIG. 4, the curved rolls (diameter at the center of the body length was 600 mm) were assembled into each stand of a cold tandem rolling mill as a pair of upper and lower parts, and the other conditions were the same as in Example 3 above. Rolling, as well as memorize the extension of the rolling pressure after incorporating the rolls in the cold tandem rolling mill, further subjected to annealing, pickling, temper rolling to the obtained steel sheet, Was measured for glossiness (GS 20 °).

Table 4 shows the polishing conditions and the inclination angle of the polishing line in the roll, the roll roughness after the polishing, the presence or absence of unevenness in the roll after the polishing, the presence or absence of meandering during rolling, the total pressure extension, and the total pressure extension. The gloss (GS 20 °) of the steel sheet is also shown. The roll roughness was measured in the axial direction of the roll. In the cold tandem rolling mill, the rolling was performed while the rolling speed was set to 200 mpm and mineral rolling oil of 20 cSt (40 ° C.) was supplied in a 5% emulsion state.

The rolls to be incorporated in the first to fifth stands of Invention Examples D01 to D08 were formed by using a CBN wheel (shape 6A2 of JISB4131) as a hollow disc-shaped grindstone, forming the above curve by rough polishing, and then giving a cross-polishing stitch. In doing so, as shown in FIGS. 4A and 4B, the axis of the grindstone 2 attached to the polishing machine (not shown) is parallel to the normal 1N of the roll 1 according to the roll curve. The angle between the axis of the grindstone 2 and the axis of the roll 1 is changed, the offset amount of the grindstone 2 is set to more than 0 and less than 1/2 of the outer diameter of the grindstone 2, and the grindstone 2 includes the circumference of the roll 1. When the surface 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 surface was present on both sides thereof, and was 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 an offset amount of the grindstone of 0, and the other conditions were the same as those of Invention Example D01. did. As a conventional example D12, a cylindrical disc-shaped grindstone was used for the rolls to be incorporated in the first to fifth stands, and the circumferential side surface was pressed against the circumferential surface of the roll while rotating, and the polishing was performed substantially parallel to the circumferential direction of the roll. Eyes were applied to the roll circumference.

Comprehensive evaluation was the same as in Example 1.

From these results, in Invention Examples D01 to D08, the cross-polished stitches having substantially the same inclination angle and roll roughness as those of Invention Examples A01 to A08 of Example 1 can be given to the curved rolls of the first to fifth stands. It was found that no polishing unevenness occurred.

発 明 In addition, in Invention Examples D01 to D08, the glossiness of the steel sheet was better than Comparative Example D11 and Conventional Example D12, and no uneven gloss and no meandering occurred. The reason why the results of Inventive Examples D1 to D08 were obtained is the same as the reason of A01 to A08 of the first embodiment described above, and the description is omitted.

1A is a partial plan view showing a contact state between a grinding wheel and a flat roll, and FIG. 1B is a BB portion of FIG. 1A. FIG. 1C is a sectional view, and FIG. 1C is an AA sectional view of FIG. It is a top view which shows the direction of the circumferential velocity vector of a grindstone in the contact surface of a grindstone and a roll. It is a schematic development view of the surface of the roll which shows the inclination angle of the cross polishing eye provided by the roll polishing method of the present invention. 4A is a plan view showing a contact state between a grindstone and a curved roll in the roll polishing method of the present invention, and FIG. 4B is a partial cross-sectional view taken along the line B′-B ′ of FIG. 4A. . FIG. 3 is a partial cross-sectional view showing a polishing state in which a grinding wheel axis 2A is inclined. FIG. 6A is a schematic plan view showing the contact state between the polished surface of the grindstone and the roll when the offset amount X of the grindstone 2 is equal to or more than の of the inner diameter of the grindstone 2 and less than 1/2 of the outer diameter. FIG. 6B is a front view showing a worn state of the grindstone after use in the contact state. 4 is a graph showing the effect of the outer peripheral speed of the grindstone / roll outer peripheral speed on the inclination angle of the cross-polished eyes. FIG. 4 is a partial cross-sectional view showing a contact state between a polishing surface of a grindstone and a roll when the inclination angle of a shaft of the grindstone is slightly increased in the polishing method of the present invention. FIG. 9A is a partial cross-sectional view illustrating a contact point between a polished surface of a grindstone and a roll, and FIG. 9B is a diagram illustrating a contact point between a polished surface of the grindstone and a roll. It is a schematic plan view showing a point. It is a schematic development view of the roll surface which shows the inclination of the roll grinding | polishing provided by the polishing method of the conventional example.

Explanation of reference numerals

1 Rolls for rolling (rolls)
1A Roll axis (roll axis)
1B Roll rotation direction
1N Roll normal 2 Hollow disk-shaped whetstone (whetstone)
2A Grindstone axis (grindstone axis)
2B Wheel rotation direction 2C Wheel movement direction O Center of the grinding surface of the grinding wheel 2D Line passing through the center of the grinding surface of the grinding wheel and equally dividing the grinding wheel by a virtual surface including the circumference of the roll
3L, 3R Grinding stone grinding surface and roll contact surface
4L, the angle formed between the roll circumferential direction of the outer peripheral velocity vector and the inner peripheral velocity vector of the grinding wheel in the contact surface between the 4R grindstone and clearance X offset θ1 between the rolls, .theta.2 grindstone and the roll theta ^+, theta ^- Cross polishing marks of One tilt angle and the other tilt angle

Claims (6)

Using a hollow disc-shaped whetstone, while rotating the whetstone, contact the roll for rotation, and further polishing the rolling roll by relatively moving in the axial direction of the roll, When the offset amount is greater than 0 and less than 1/2 of the outer diameter of the grinding wheel, and the grinding wheel is equally divided on a surface including the circumference of the rolling roll, the contact surface between the grinding wheel and the rolling roll is the same. A method for polishing a rolling roll for cold rolling a stainless steel sheet, which is present on both sides of a branch line. The method 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.   The method according to claim 1 or 2, wherein an outer peripheral speed of the grindstone is three times or more as large as an outer peripheral speed of the rolling roll. For rolling for cold rolling a stainless steel sheet according to any one of claims 1 to 3, wherein 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. Roll polishing method. 5. The method for polishing a rolling roll for cold rolling a stainless steel sheet according to claim 1, wherein the grain size of the abrasive grains of the whetstone is # 100 to # 400. A rolling roll for cold rolling a stainless steel sheet provided with a cross-polished line by the method for polishing a rolling roll according to any one of claims 1 to 5.

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