JP2015223593A - Method of and apparatus for polishing mill roll - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of and an apparatus each of which enables foreign matter to be removed from the outer circumferential surface of a mill roll in a rolling mill or to be prevented from adhering to the outer circumferential surface without changing the profile of the outer circumferential surface of the mill roll.SOLUTION: A method for polishing a mill roll 2 is provided, which is the method for removing foreign matter from the cylindrical outer circumferential surface of a mill roll or for preventing the adhesion of the foreign matter to the surface by polishing the outer circumferential surface. The method comprises rotating the mill roll 2 around the central axis of the outer circumferential surface 3 of the mill roll 2, and polishing the outer circumferential surface 3 by bringing polishing material 4 into contact with the outer circumferential surface 3 of the rotating mill roll 2. The method uses the polishing material 4 that includes a nonwoven cloth including polyamide fiber, the hardened material of thermosetting resin impregnated in the nonwoven cloth, and a filler dispersed in the hardened material and including at least one of silicon carbide and aluminum oxide.

Description

  The present invention relates to a method and an apparatus for polishing an outer peripheral surface on-line in order to remove foreign matters on the outer peripheral surface of a rolling roll in a rolling mill or to prevent adhesion of foreign matters.

  Conventionally, what is described in patent document 1 is known as a method for processing the outer peripheral surface of a rolling roll. This method is a method of grinding the outer peripheral surface in order to correct the profile of the outer peripheral surface of the rolling roll, the rotating roll rotating around its central axis, and the outer peripheral surface of the rotating rolling roll Grinding the outer peripheral surface by pressing the abrasive with a piston / cylinder mechanism.

Japanese Unexamined Patent Publication No. 63-60009

  In the rolling mill equipped with the rolling roll, when processing the outer peripheral surface of the rolling roll online during the operation, it may be required to effectively remove only the foreign matters without changing the profile of the outer peripheral surface. is there.

  However, since the method described in Patent Document 1 is for changing the profile of the outer peripheral surface to a desired profile by grinding the outer peripheral surface of the rolling roll with an abrasive, change the profile. Therefore, it is difficult to remove only the foreign matters.

  An object of this invention is to provide the method and apparatus which can remove the foreign material on the outer peripheral surface, or prevention of the adhesion of the said foreign material, without changing the profile of the outer peripheral surface of the rolling roll in a rolling mill.

  The present invention provides a method for removing foreign matter on the outer peripheral surface or preventing adhesion of foreign matters by polishing the outer peripheral surface of a rolling roll having a cylindrical outer peripheral surface, Rotating the rolling roll around the central axis of the outer circumferential surface, and polishing the outer circumferential surface by bringing an abrasive into contact with the outer circumferential surface of the rotating rolling roll. The abrasive includes a non-woven fabric containing polyamide fibers, a cured product of a thermosetting resin impregnated in the non-woven fabric, and a filler containing at least one of silicon carbide and aluminum oxide dispersed in the cured product. A polishing material containing is used.

  According to this method, the abrasive can be deformed into a shape familiar with the outer peripheral surface without changing the profile of the outer peripheral surface by contact with the outer peripheral surface of the rolling roll, and stable contact in this state. The foreign matter on the outer peripheral surface can be removed by polishing the outer peripheral surface while contacting the outer peripheral surface with pressure.

Specifically, the abrasive preferably has a density of 0.7 to 1.5 g / cm ³ . That is, it is preferable that the abrasive is an abrasive that includes the nonwoven fabric, the cured product, and the filler, and is molded so as to have a density of 0.7 to 1.5 g / cm ³ .

  If such an abrasive is used, the foreign matter on the outer peripheral surface of the rolling roll can be removed more suitably, and the removal can be realized for a longer period of time.

  Moreover, as for the said abrasive, content of the said nonwoven fabric is 36-54 mass% with respect to the said abrasive, and content of the said filler is 24-36 mass% with respect to the said abrasive. Preferably there is. Moreover, it is preferable that the said thermosetting resin is at least one of an epoxy resin and a phenol resin. Moreover, it is preferable that the said filler is a filler whose average particle diameter is 27-75 micrometers.

  By using such an abrasive, it is possible to suitably realize the above-described polishing on the rolling roll.

  Since the abrasive can be unevenly worn in a shape adapted to the shape of the outer peripheral surface of the rolling roll as described above, the outer peripheral surface is in contact with the outer peripheral surface of the rolling roll with a large friction distance. Can be polished. Here, the “friction distance” refers to a dimension in the circumferential direction of the surface region when the surface region where the outer peripheral surface of the rolling roll contacts the abrasive is viewed from the radial direction of the rolling roll. Ensuring a large frictional distance reduces the surface pressure (contact pressure per unit area) of the abrasive with respect to the outer peripheral surface of the rolling roll during polishing, thereby removing foreign substances while suppressing wear of the abrasive. It is possible to secure the linear pressure (contact pressure per unit length) necessary for That is, since the surface pressure is obtained by multiplying the linear pressure by the friction distance, the increase in the friction distance makes it possible to suppress the surface pressure while setting the linear pressure high.

Specifically, the friction distance is preferably 1.00 mm or more. This friction distance is, for example, by polishing the outer peripheral surface of the rolling roll with a linear pressure of 0.0035 kgf / mm or more to prevent the removal of foreign matters on the outer peripheral surface or the generation of foreign matters, while the surface pressure is 0.0035 kgf / mm. It is possible to suppress the abrasion of the abrasive by suppressing to ² mm or less. On the other hand, in view of the layout of a general rolling mill, the friction distance is a distance equal to or less than the friction distance corresponding to the circumference of (2/3) πR when the radius of the rolling roll is R. preferable.

  About the said linear pressure, it is more preferable to grind | polish the said outer peripheral surface with the friction distance which makes the said abrasive material contact with the outer peripheral surface of the said rolling roll with 0.0047 kgf / mm or more of linear pressure. More preferably, the outer peripheral surface is polished at a friction distance in which the abrasive is brought into contact with the outer peripheral surface of the rolling roll with a linear pressure of 0.0065 kgf / mm or more.

On the other hand, with respect to the surface pressure, it is more preferable to polish the outer peripheral surface at a friction distance in which the abrasive is brought into contact with the outer peripheral surface of the rolling roll at a surface pressure of 0.0018 kgf / mm ² or less. More preferably, the outer peripheral surface is polished at a friction distance in which the abrasive is brought into contact with the outer peripheral surface of the rolling roll at a surface pressure of 0.0008 kgf / mm ² or less.

  Moreover, this invention provides the apparatus for removing the foreign material on the said outer peripheral surface, or preventing adhesion of a foreign material by grind | polishing the said outer peripheral surface of the rolling roll which has a cylindrical outer peripheral surface. The apparatus includes an abrasive for polishing the outer peripheral surface of the rolling roll, and an abrasive operating unit that polishes the outer peripheral surface by contacting the outer peripheral surface of the rotating roll while holding the abrasive. And comprising. The abrasive includes a nonwoven fabric containing polyamide fibers, a cured product of a thermosetting resin impregnated in the nonwoven fabric, and a filler containing at least one of silicon carbide and aluminum oxide dispersed in the cured product. .

In this apparatus, the abrasive used in the polishing method is preferable as the abrasive. That is, the abrasive preferably has a density of 0.7 to 1.5 g / cm ³ . Moreover, as for the said abrasive, content of the said nonwoven fabric is 36-54 mass% with respect to the said abrasive, and content of the said filler is 24-36 mass% with respect to the said abrasive. Preferably there is. Moreover, it is preferable that the said thermosetting resin is at least one of an epoxy resin and a phenol resin. Moreover, it is preferable that the said filler is a filler whose average particle diameter is 27-75 micrometers.

  The abrasive operation unit includes an abrasive holding unit that holds the abrasive, a contact position where the abrasive contacts the outer peripheral surface of the rolling roll, and a spaced position where the abrasive is separated from the outer peripheral surface. And a support portion that supports the abrasive material holding portion so that the abrasive material holding portion can be moved. According to this apparatus, the abrasive can be brought into and out of contact with the rolling roll while the abrasive holder holds the abrasive.

  In this case, it is preferable that the abrasive material operating unit further includes a load adjusting mechanism that changes a load for bringing the abrasive material into contact with the outer peripheral surface of the rolling roll. The adjustment of the load by this load adjustment mechanism makes it possible to adjust the linear pressure or surface pressure of the abrasive with respect to the outer peripheral surface to an appropriate pressure.

  The present invention also provides a rolling roll unit that is detachably attached to a housing of a rolling mill. This rolling roll unit has a rotating shaft and a roll body disposed around the rotating shaft, and the roll body has a cylindrical outer peripheral surface centering on the rotating shaft, and both end portions of the rotating shaft. A roll chock that is detachably mounted on the housing and that rotatably supports the rotating shaft in the mounted state, and the rolling roll polishing apparatus, and the rolling roll polishing The apparatus is such that the abrasive of the rolling roll polishing apparatus can contact the outer peripheral surface of the roll body of the rolling roll, and the rolling roll polishing apparatus is attached to and detached from the housing integrally with the rolling roll and the roll chock. It is attached to the roll chock.

  According to the rolling roll unit, the rolling roll polishing device is attached to the roll chock, and the rolling chock is mounted on the housing, and the rolling roll unit is rotated on the outer peripheral surface while rotating the rolling roll of the rolling roll unit. By bringing the abrasive of the roll polishing device into contact, it is possible to remove or prevent adhesion of foreign matters on the outer peripheral surface, and to attach and detach the rolling roll polishing device, the rolling roll, and the roll chock together with the housing. Is possible.

  Moreover, this invention provides the rolling mill containing the said rolling roll grinding | polishing apparatus. This rolling mill is interposed between a rolling roll having a cylindrical outer peripheral surface, a housing that supports the rolling roll, the rolling roll and the housing, and allows rotation about the central axis of the rolling roll. A roll chock, a rotation drive device that rotates the rolling roll, and the rolling roll polishing device are provided. This rolling roll polishing apparatus is attached to the roll chock or the housing so that the abrasive of the rolling roll polishing apparatus can come into contact with the outer peripheral surface of the rolling roll.

  When the rolling mill further includes a cooling liquid supply unit that supplies a cooling liquid for cooling the rolling roll onto the outer peripheral surface of the rolling roll, the abrasive extends along the axial direction of the rolling roll. It is plate-shaped and has a shape that can continuously contact the outer peripheral surface of the rolling roll in the axial direction, and the abrasive is closer to the rolled material than the coolant supply position by the coolant supply unit It is preferable that it is arrange | positioned so that the outer peripheral surface of the said rolling roll may be contacted in a position. This abrasive can also function as a liquid draining material that prevents the cooling liquid from adhering to the rolled material while removing or preventing foreign matter on the outer peripheral surface.

  As mentioned above, according to this invention, the method and apparatus which can remove the foreign material on the outer peripheral surface without changing the profile of the outer peripheral surface of the rolling roll in a rolling mill are provided.

It is a figure which shows the outline of the grinding | polishing method of the rolling roll which concerns on embodiment of this invention. It is the schematic which shows the structure of the testing machine for the abrasion test which evaluates the grinding | polishing performance by an abrasive | polishing material with respect to the said rolling roll. It is a front view of the abrasive after conducting the polishing test. It is a front view which shows the state which the abrasives have contacted with the friction distance L1 with respect to the outer peripheral surface of a rolling roll in the said rolling roll grinding | polishing method. It is a front view which shows the state which the abrasives have contacted with the friction distance L2 with respect to the outer peripheral surface of a rolling roll in the said rolling roll grinding | polishing method. It is a front view which shows the contact state of the rolling roll and polishing board in the foreign material removal capability test for specifying the linear pressure required by grinding | polishing by the said rolling roll grinding | polishing method. It is a front view which shows the other contact state of the rolling roll and polishing board in the said foreign material removal capability test. It is a graph which shows the result of the said foreign material removal capability test. It is a front view which shows the contact state of the rolling roll and polishing board in the abrasion test for pinpointing the appropriate surface pressure by grinding | polishing by the said rolling roll grinding | polishing method. It is a graph which shows the result of the said abrasion test. It is a graph which shows the relationship between a friction distance when a linear pressure is 0.0035 kgf / mm, and surface pressure. It is a graph which shows the relationship between a friction distance when a linear pressure is 0.0065 kgf / mm, and surface pressure. It is a graph which shows the relationship between the friction distance and surface pressure when a linear pressure is 0.0035 kgf / mm, 0.0047 kgf / mm, and 0.0065 kgf / mm, respectively. It is a front view which shows the example of the layout around the rolling roller in a common rolling mill. BRIEF DESCRIPTION OF THE DRAWINGS It is a fracture | rupture front view which shows the principal part of the rolling roll grinding | polishing apparatus which concerns on embodiment of this invention, and a rolling mill provided with this. It is a top view which shows the rolling roll unit contained in the said rolling mill. It is a cross-sectional front view which shows the rolling roll grinding | polishing apparatus provided in the said rolling roll unit. It is a fracture | rupture top view of the said rolling roll grinding | polishing apparatus. It is a front view which shows the 1st modification of the said rolling roll grinding | polishing apparatus. It is a front view which shows the 2nd modification of the said rolling roll grinding | polishing apparatus.

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

  FIG. 1 shows an outline of a polishing method for a rolling roll 2 according to an embodiment of the present invention. In this method, the outer peripheral surface 3 is rotated by rotating the rolling roll 2 around its central axis and bringing the abrasive 4 into contact with the outer peripheral surface 3 of the rotating rolling roll 2 with an appropriate contact pressure p. And removing foreign matter on the outer peripheral surface 3 or preventing the foreign matter from adhering.

  As a feature of this method, the abrasive 4 includes at least one of a nonwoven fabric containing polyamide fibers, a cured product of a thermosetting resin impregnated in the nonwoven fabric, and silicon carbide and aluminum oxide dispersed in the cured product. Including fillers.

  The nonwoven fabric is not particularly limited as long as it contains polyamide fibers, that is, a polyamide nonwoven fabric. Examples of the non-woven fabric include a non-woven fabric containing a polyamide fiber as a main component and a non-woven fabric made of a polyamide fiber. Moreover, as long as the said nonwoven fabric contains the polyamide fiber, it may contain other fibers, such as a polyester fiber and a cellulose fiber.

  Moreover, the said hardened | cured material is a hardened | cured material with which the thermosetting resin in the state impregnated in the said nonwoven fabric was hardened. Moreover, it does not specifically limit as said thermosetting resin, For example, an epoxy resin, a phenol resin, etc. are used suitably.

Moreover, the said filler is contained in the state disperse | distributed to the said hardened | cured material. The abrasive includes at least one of silicon carbide (SiC) and aluminum oxide (Al ₂ O ₃ ) as the filler. That is, the filler may contain any one of SiC and Al ₂ O ₃ , or may contain both. The filler may contain other fillers in addition to SiC and Al ₂ O ₃ . Examples of other fillers include diamond and boron nitride.

  Further, the shape of the filler is not particularly limited, and examples thereof include a powder form and a particulate form. Moreover, it is preferable that the average particle diameter of the said filler is 27-75 micrometers. If this average particle size is too small, the polishing effect by the abrasive tends to be reduced. Moreover, when this average particle diameter is too large, the filler tends to be difficult to uniformly disperse in the abrasive.

  Here, the average particle diameter includes, for example, a cumulative 50% diameter (cumulative median diameter) and the like. This cumulative median diameter is obtained by measuring the particle size distribution assuming an aggregate of one powder (particle) and calculating the cumulative curve with the total volume of the powder population as 100%. The particle diameter at the point where the curve becomes 50%. More specifically, the particle diameter (median diameter) at a 50% cumulative height measured by a method based on JIS R6001 (1998) can be mentioned.

Further, the abrasive preferably has a density of 0.5 to 1.5 g / cm ³ , and more preferably 0.7 to 1.5 g / cm ³ . If the density is too low, the resulting abrasive becomes sparse and wear resistance, which is durability when subjected to polishing, tends to decrease. In addition, the polishing effect by the abrasive tends to decrease. On the other hand, defects that are too dense are less likely to occur in practice. Therefore, the density of the abrasive is limited to about 1.5 g / cm ^{3 in} the case of the composition as described above, and this limit of 1.5 g / cm ³ is actually It is the upper limit of the density range.

  Here, the density can be measured with a general hydrometer, for example, the density (specific gravity) measured by the underwater substitution method.

  In addition, as described above, the abrasive contains the filler dispersed in the cured product. This can be seen from the fact that the same level of density can be obtained by dividing the abrasive material into appropriate layers, for example, dividing the abrasive material into a plurality of layers in the thickness direction, and then measuring the density of each of the divided portions.

  Moreover, the said abrasive | polishing material should just contain the said nonwoven fabric, the said hardened | cured material, and the said filler, and may consist of the said nonwoven fabric, the said hardened | cured material, and the said filler which do not contain another component. It may also contain other components. Moreover, it is preferable that the said abrasive | polishing material consists of the said nonwoven fabric, the said hardened | cured material, and the said filler.

  Moreover, it is preferable that content of the said nonwoven fabric is 36-54 mass% with respect to the said abrasive | polishing material whole quantity. When the amount of the non-woven fabric is too small, the amount of the cured product is relatively increased, and the non-woven fabric tends to be difficult to hold the cured product. That is, a suitable abrasive tends to be difficult to form. Moreover, when there are too many said nonwoven fabrics, the quantity of hardened | cured material will reduce relatively and there exists a tendency for the obtained abrasive | polishing material to become difficult to become dense.

  Moreover, it is preferable that content of the said filler is 24-36 mass% with respect to the said abrasive | polishing material whole quantity. If the amount of the abrasive is too small, the polishing effect by the abrasive tends to decrease. Moreover, when there are too many said abrasives, a filler will become difficult to disperse | distribute uniformly in an abrasive | polishing material, and there exists a tendency for a suitable abrasive | polishing material to become difficult to be formed.

  In addition, the content ratio of the nonwoven fabric to the filler is preferably 50:50 to 70:30, more preferably 55:45 to 65:35, in terms of mass ratio. Specifically, the content ratio of the nonwoven fabric to the filler is about 60:40 by mass ratio.

  Moreover, it is preferable that it is 10-40 mass% with respect to the said abrasive | polishing material whole quantity, and, as for content of the said hardened | cured material, it is more preferable that it is 20-35 mass%. Moreover, when there are too few said hardened | cured materials, there exists a tendency for the quantity of a nonwoven fabric to increase relatively and the obtained abrasive | polishing material becomes difficult to become dense. Moreover, when there are too many said hardened | cured materials, the quantity of a nonwoven fabric will reduce relatively, it will become difficult to hold hardened | cured material in a nonwoven fabric, and it will become easy to produce the density of a filler. That is, a suitable abrasive tends to be difficult to form.

  The shape of the abrasive is not particularly limited as long as the outer peripheral surface of the rolling roll, which is an object to be polished, can be polished, and examples thereof include a rectangular parallelepiped. Further, the size of the abrasive can be appropriately selected depending on the size of a rolling roll as an object to be polished.

  The method for producing the abrasive is not particularly limited as long as the abrasive can be obtained. Specifically, the non-woven fabric, the cured product, and the filler were impregnated with the thermosetting resin before curing of the cured product and the filler so that the respective contents were predetermined amounts. Examples include a method of heating the curable resin by heating the prepreg, which is the nonwoven fabric, in a pressurized state. At that time, one prepreg may be used, or a laminate of a plurality of the prepregs may be used so that the finally obtained abrasive has a predetermined thickness. Moreover, it is preferable to adjust the conditions of the said heating and the said pressurization so that the density of the abrasive | polishing material finally obtained will be in the said range.

  The present inventors conducted a wear test for evaluating the polishing performance of the abrasive rolls with the abrasive. FIG. 2 shows an abrasion tester 101 for this test.

  In this wear test machine 101, the abrasive 4 is fixed to the other end of the support rod 102 that can rotate with one end serving as a fulcrum. This abrasive 4 is brought into contact with the outer peripheral surface 3 of the rolling roll 2. The support rod 102 is provided with a weight 103 at the center thereof so that the linear pressure of the abrasive 4 against the outer peripheral surface 3 becomes a predetermined pressure. The wear test machine 101 is driven to rotate the rolling roll 2 in such a state.

Such a wear test by the wear tester 101 is evaluated from the wear amount of the abrasive 4 and the polish amount of the outer peripheral surface 3 of the rolling roll 2. The polishing amount of the abrasive 4 is calculated as follows. For example, when the abrasive 4 is a rectangular parallelepiped, the abrasive 4 disappears due to wear as shown in FIG. The volume (mm ³ ) of the portion 105 extinguished by this wear is calculated as A (mm) × B (mm) × abrasive width (mm) × 0.5.

  Such wear test shows that it is possible to remove foreign matter on the outer peripheral surface of the rolling mill without changing the profile of the outer peripheral surface of the rolling roll. The detailed evaluation result of the polishing performance by the abrasive for the rolling roll will be described later.

  Since the abrasive 4 can be unevenly worn in a shape adapted to the shape of the outer peripheral surface 3 of the rolling roll 2 as described above, the abrasive 4 is preliminarily disposed along the outer peripheral surface 3 of the rolling roll 2. The friction distance L can be increased by wearing along the shape of the outer peripheral surface 3 promptly after the start of contact with the rolling roll 2 even if it has not been pre-processed into the shape, and therefore with a large friction distance L Therefore, the outer peripheral surface 3 can be polished while being in contact with the outer peripheral surface 3 of the rolling roll 2. The friction distance L can be easily set to a desired distance depending on the contact angle of the abrasive 4 with respect to the outer peripheral surface 3 and the width of the abrasive 4.

  Here, the “friction distance” refers to a dimension in the circumferential direction of the surface area when the surface area where the outer peripheral surface 3 of the rolling roll 2 and the abrasive 4 are in contact is seen from the radial direction of the rolling roll. Increasing the friction distance L suppresses the surface pressure (contact load per unit area) of the abrasive 4 with respect to the outer peripheral surface 3 of the rolling roll 2 during polishing, and the excessive wear of the abrasive progresses. While making it possible to avoid the occurrence of vibrations in the facility, it is possible to ensure the linear pressure (contact pressure per unit length) necessary for removing foreign substances.

  Specifically, according to Preston's equation that the amount of wear of materials that are in contact with each other is proportional to the load, relative speed, and contact time of the contact, the higher the linear pressure, the higher the foreign matter adhesion prevention effect and the foreign matter removal effect. It will be. On the other hand, since the surface pressure is obtained by multiplying the linear pressure by the friction distance, the increase in the friction distance makes it possible to suppress the surface pressure while setting the linear pressure high. For example, when the linear pressure is P, the surface pressure is p, and the friction distance is L, the linear pressure P is expressed as P = p × L. Therefore, the linear pressure P is constant under the condition that the linear pressure P is constant. As shown in FIG. 5, when polishing is performed at different friction distances L1, L2 (L1> L2), the relationship between the surface pressures p1, p2 at that time is expressed by the following equation.

P = p1 × L1 = p2 × L2 ∴ p1 <p2
In this manner, since the surface pressure p can be kept small by increasing the friction distance L even at the same linear pressure P, polishing at a large friction distance L can remove foreign matter or prevent adhesion by a sufficient linear pressure P. It is possible to achieve both the effect and the effect of suppressing wear of the abrasive by reducing the surface pressure p (that is, reducing the frequency of changing the abrasive).

  The present inventors conducted a foreign matter removing ability test for specifying a linear pressure necessary for removing the foreign matter. 6 and 7 show equipment for that purpose. The abrasive 4 is attached to the beam 6 via a wire 5 at a position in contact with the outer peripheral surface 3 of the rolling roll 2, and the rolling roll 2 is rotationally driven in this state. The surface pressure of the abrasive 4 with respect to the outer peripheral surface 3 is adjusted by attaching a weight (for example, an iron plate) 7 as shown in FIG. At this time, the surface pressure can be calculated from the contact angle α of the abrasive 4 with respect to the outer peripheral surface 3 and the friction distance L.

  FIG. 8 shows the result of testing the foreign material removal ability of the abrasive 4 using such equipment. As shown in this graph, if a linear pressure (= calculated surface pressure × friction distance L) of 0.0035 kgf / mm or more, more preferably 0.0047 kgf / mm or more is secured, at least the generation of foreign matter is prevented. In addition, if the linear pressure is 0.0065 kgf / mm or more, it is possible to remove foreign substances already attached.

  In addition, the present inventors conducted an abrasion test for specifying an appropriate surface pressure in the polishing. The equipment for that is shown in FIG. This equipment includes a lathe that rotates the rolling roll 2 about its central axis, an abrasive holder 8 that is fixed to the tool post, and a compression coil spring 9. The abrasive 4 is held by the abrasive holder 8 so as to be slidable along the rotational radius direction of the rolling roll 2. The compression coil spring 9 is loaded in the abrasive holder 8 and imparts a resilient force to the abrasive 4 in such a direction that the end of the abrasive 4 is pressed against the outer peripheral surface 3 of the rolling roll 2.

  With such equipment, a wear test was performed on the degree of wear of the abrasive 4. In this test, the abrasive 4 was pressed against the outer peripheral surface of the rolling roll 2 for about 10 seconds, and the generation state of the wear powder at that time was visually observed.

  The result of the test is shown in FIG. In FIG. 10, “minor” indicates a state in which the wear powder is not generated, “small wear” indicates wear to the extent that there is a feel of the wear powder when the abrasive 4 is touched with bare hands, and “under wear” indicates wear. Wear to such an extent that the generation of powder can be visually observed, and “large wear” means wear to the extent that wear powder scatters.

As shown in FIG. 10, the degree of wear of the abrasive 4 is large in the region where the surface pressure exceeds 0.0035 kgf / mm ^2, and it is difficult to prevent the wear of the “high wear” level. On the other hand, in the region where the surface pressure is 0.0035 kgf / mm ² or less, it is possible to prevent the wear of “high wear” level shown in FIG. Furthermore, surface pressure can also be prevented level wear "in wear" if 0.0018kgf / mm ² or less, if the surface pressure is 0.0008kgf / mm ² or less of the level of the "in wear" Wear Can prevent up to.

From the above test results, in order to polish the rolling roll 2 with the abrasive 4, (i) the linear pressure is not less than a certain linear pressure (for example, 0.0035 kgf / mm or more, more preferably 0.0065 kgf / mm or more). And (ii) the surface pressure is not more than a certain surface pressure (for example, 0.0035 kgf / mm ² or less, more preferably 0.0018 kgf / mm ² or less, more preferably 0.0008 kgf / mm ² or less). However, the increase in the friction distance L due to the characteristics of the abrasive 4 makes it possible to satisfy both the conditions (i) and (ii) at the same time.

FIGS. 11 and 12 show the relationship between the friction distance (mm) and the surface pressure (kgf / mm ² ) when the linear pressure is 0.0035 kgf / mm and 0.0065 kgf / mm, respectively. As shown in FIG. 11, it is possible to suppress the surface pressure to 0.0035 kgf / mm ² or less if the friction distance is 1.00 mm or more while securing a linear pressure of 0.0035 kgf / mm, If the friction distance is 4.38 mm or more, the surface pressure can be suppressed to 0.0008 kgf / mm ² or less. On the other hand, if the friction distance is 1.86 mm or more, it is possible to secure a linear pressure of 0.0065 kgf / mm or more while suppressing the surface pressure to 0.0035 kgf / mm ² or less, and the friction distance is 8.13 mm. In this way, the surface pressure can be suppressed to 0.0008 kgf / mm ² or less while ensuring a linear pressure of 0.0065 kgf / mm or more.

FIG. 13 is a solid line showing the relationship between the friction distance (mm) and the surface pressure (kgf / mm ² ) when the linear pressure is 0.0035 kgf / mm, 0.0047 kgf / mm, and 0.0065 kgf / mm. , Indicated by a broken line and a one-dot chain line, respectively. As shown in FIG. 13, since the friction distance and the surface pressure are in an inversely proportional relationship regardless of the linear pressure, it is preferable to increase the friction distance correspondingly even if the linear pressure is set high. It is possible to obtain a high surface pressure. Specifically, the friction distance corresponding to the intersection of each curve and the horizontal line (surface pressure is 0.0035 kgf / mm ² ) indicated by the solid line for any curve indicated by the solid line, the broken line, and the alternate long and short dash line in FIG. It is preferable that the above friction distance is maintained, and it is more preferable that the friction distance not less than the friction distance corresponding to the intersection of each curve and the horizontal line (surface pressure is 0.0018 kgf / mm ² ) indicated by a broken line is maintained. More preferably, a friction distance equal to or greater than the friction distance corresponding to the intersection of each curve and the horizontal line (the surface pressure is 0.0008 kgf / mm ² ) indicated by the alternate long and short dash line is maintained.

  On the other hand, the upper limit of the friction distance may be set according to the layout of peripheral equipment of the rolling roll in the rolling mill. In a general rolling mill, the central angle β corresponding to the friction distance, that is, the angle occupied by the region where the abrasive 4 and the outer peripheral surface of the rolling roll 2 are in contact is (2/3) π (radian). It is preferable. In other words, the friction distance is preferably set to such a friction distance that the circumference of the contact region is equal to or less than (2/3) πR when the radius of the rolling roll 2 is R.

  FIG. 14 shows a layout around the rolling roll 2 in a general rolling mill. As shown in FIG. 14, around the rolling roll 2, a cooling liquid supply unit (for example, nozzle) 80 for supplying a cooling liquid (for example, water) 82 for cooling the outer peripheral surface 3 of the rolling roll 2. In addition, a liquid draining plate 84 for preventing the supplied cooling liquid from adhering to the rolling material 90 is generally disposed. In order to enable the disposition, the abrasive 4 is used as a rolling roll. The center angle β of the region in contact with the outer peripheral surface 2 is preferably set to (2/3) π (= 120 °) or less as shown in FIG. Further, as shown in FIG. 14, when polishing is performed with a relatively large central angle β, a plurality of abrasives 4 may be used in a state of being arranged in the circumferential direction.

  In the rolling mill having a backup roll in addition to the rolling roll actually used, the upper limit of the friction distance is further limited in the rolling mill in which the backup roll is disposed in the vicinity of the rolling roll.

  Next, an example of a polishing roll rolling device suitable for carrying out the polishing method and a rolling mill equipped with the same will be described.

  FIG.15 and FIG.16 shows the principal part of the said rolling mill. The rolling mill includes a housing 10 and a pair of upper and lower rolling roll units 11 and 12 mounted on the housing 10. As shown in FIG. 16, each of the rolling roll units 11 and 12 includes a rolling roll 14, a pair of front and rear roll chocks 16, a motor 18 that is a rotation driving device, and a rolling roll polishing device 20. The upper and lower rolling rolls 14 are rotationally driven by the motor 18 in a state where a rolling material to be processed is sandwiched between the rolling rolls 14, thereby rolling the rolling material.

  Each of the rolling rolls 14 includes a rotating shaft 22 and a roll main body 24 disposed around the rotating shaft 22. The motor 18 is connected to one end of the rotating shaft 22 to rotate the rotating shaft 22 and the roll body 24 integrally. The roll body 24 has a cylindrical outer peripheral surface 26, and the rolling roll 14 is rotationally driven while the outer peripheral surface 26 is in contact with the surface of the rolled material. Both end portions of the rotating shaft 22 in the axial direction protrude outward from both ends of the roll body 24 in the axial direction.

  The pair of roll chocks 16 function as bearings for the rolling roll 14, and are attached to both ends of the rotary shaft 22. These roll chocks 16 are mounted so as to be insertable / removable in the axial direction (front-rear direction; depth direction in FIG. 15) with respect to the housing 10, and relative rotation of the rolling roll 14 with respect to the housing 10 in the mounted state. The rolling roll 14 is supported while allowing

  17 and 18 show a specific configuration of the rolling roll polishing apparatus 20 included in the upper rolling roll unit 11. The rolling roll polishing apparatus 20 includes an abrasive 28 and an abrasive operation unit 30.

  The abrasive 28 contacts the outer peripheral surface 26 of the rolling roll 14 that is rotationally driven as described above, and polishes the outer peripheral surface 26, thereby preventing the removal of foreign matters on the outer peripheral surface 26 or the prevention of adhesion of foreign matters. Is to do. The abrasive 28 according to this embodiment has a block shape (cubic shape) extending in the axial direction of the rolling roll 14. The abrasive 28 may be divided in the axial direction. The specific material of the abrasive 28 is equivalent to that of the abrasive 4 described above.

  The abrasive material operating unit 30 is configured to bring the abrasive material 28 into contact with the outer peripheral surface 26 of the rolling roll 14 while holding the abrasive material 28, and includes a holder 32, a support unit 34, a load adjusting mechanism 36, and the like. Have.

  The holder 32 corresponds to an abrasive holding part, and holds the upper end of the abrasive 28 so as to expose the lower surface which is a surface in contact with the outer peripheral surface 26 of the rolling roll. Specifically, the holder 32 includes an abrasive fixing plate 38 and a supported portion 40 protruding upward from the upper surface of the abrasive fixing plate 38, and the polishing is fixed on the lower surface of the abrasive fixing plate 38. The material 28 is fixed.

  The support portion 34 has a position where the lower surface of the abrasive 28 is in contact with the outer peripheral surface 26 of the rolling roll 14 (solid line position in FIG. 17) and a position spaced apart upward from the outer peripheral surface 26 (two-dot chain line in FIG. 17). The holder 32 is supported so as to be movable between the first position and the second position. Further, the support portion 34 according to this embodiment is attached to the roll chock 16 so that the entire roll roll polishing apparatus 20 is attached to and detached from the housing 20 integrally with the rolling roll 14 and the pair of roll chock 16. It has been.

  Specifically, the support portion 34 according to this embodiment includes a pair of left and right vertical beams 42, two pairs of front and rear horizontal beams 44, and a support member attached to each of the pair of horizontal beams 44.

  As shown in FIG. 16, the pair of vertical beams 42 are bridged between the two roll chocks 16 in a parallel state with a space in the left-right direction. The paired horizontal beams 44 are bridged between the vertical beams 42 at two positions aligned in the front-rear direction, and a distance in the front-rear direction is also provided between the paired horizontal beams 44. .

  Each of the support members includes a support bracket 46, a rotation shaft 48, and a holder support portion 50.

  The support bracket 46 includes a support plate 54 that is bridged between the pair of cross beams 44 and a pair of front and rear vertical plates 56 that project downward from the lower surface of the support plate 54. The rotation shaft 48 extends in the front-rear direction, and both ends thereof are rotatably supported by the vertical plates 56.

  The holder support portion 50 can rotate about the rotation shaft 48 integrally with the rotation shaft 48 while supporting the holder 32, and is held by the holder 32 by this rotation. The abrasive 28 is brought into contact with and separated from the outer peripheral surface 26 of the rolling roll 14. Specifically, the holder support portion 50 includes a main body plate 58 and a pair of front and rear holder support plates 60. The main body plate 58 has a proximal end portion to which the rotating shaft 48 is fixed and a distal end portion on the opposite side. The holder support plate 60 protrudes outward from the front end portion of the main body plate 58, and supports the supported portion 40 of the holder 32 so as to be rotatable about an axis in the front-rear direction.

  Here, the position of the rotating shaft 48 is a load that presses the lower surface of the abrasive 28 against the outer peripheral surface 26 of the rolling roll 14 by gravity acting on the abrasive 28, the holder 32, and the holder support 50. Is set to be generated. Specifically, the position of the rotation shaft 48 is set to a position higher than the combined center of gravity of the abrasive 28, the holder 32, and the holder support portion 50.

  The vertical beam 42 is provided with a hook 61 for holding the abrasive 28 in the spaced position. The hook 61 engages, for example, the holder support plate 60 of the holder support portion 50 at a position where the abrasive 28 floats from the outer peripheral surface 26 of the rolling roll 14.

  The load adjusting mechanism 36 applies an upward load to the abrasive 28 against the gravitational force acting on the abrasive 28, the holder 32, and the holder support 50. The contact pressure (surface pressure) p with respect to 26 can be adjusted. Specifically, the load adjusting mechanism 36 includes a counterweight mounting plate 62 and a plurality of counterweights 64.

  The counterweight mounting plate 62 is fixed to the rotation shaft 48 so as to rotate about the rotation shaft 48 integrally with the holder support portion 50. Specifically, the counterweight mounting plate 52 is a flat plate that stands upright in the radial direction of the rolling roll 14, and the fixed portion 65 fixed to the rotating shaft 48 and the rotating shaft 48 are sandwiched between the counterweight mounting plate 52 and the rotating shaft 48. A main body 66 located on the opposite side of the holder support 50 is integrally provided. The counterweight 64 is detachably attached to both side surfaces of the main body 66 by bolts 67 and nuts 68. By increasing / decreasing the number of counterweights 64 mounted in this way, it is possible to increase / decrease the upward force applied to the holder support portion 50, thereby adjusting the contact pressure (surface pressure) p.

  The adjustment of the contact pressure p is not limited to that by the counter weight 64. For example, a fluid pressure cylinder 70 as shown in FIG. 19 may be used. The abrasive material operating unit 30 of the rolling roll polishing apparatus 20 shown in FIG. 19 includes the fluid pressure cylinder 70, the abrasive material holding plate 72, a rotating member 74, and a rotating member 74 that rotates around the pin 75. A bracket 76 that is movably supported. The bracket 76 is attached to the roll chock 16 or the housing 10. The abrasive holding plate 72 is fixed to an appropriate portion of the rotating member 74 while holding the abrasive 28. One end of the fluid pressure cylinder 70 is rotatably supported by the roll chock 16 or the housing 10, and the other end is connected to the rotating member 74 at a position different from the abrasive holding plate 72.

  The position of the fluid pressure cylinder 70 includes a position where the abrasive 28 comes into contact with the outer peripheral surface 26 of the rolling roll 14 and a position away from the outer peripheral surface 26 as shown in FIG. Set to move between. In this case, the contact pressure of the abrasive 28 with respect to the outer peripheral surface 26 can be adjusted by the expansion / contraction stroke of the fluid pressure cylinder 70.

  Moreover, when the rolling mill further includes a coolant supply unit 80 as shown in FIG. 20, the abrasive 28 can also function as a so-called liquid draining material. The cooling liquid supply unit 80 supplies a cooling liquid (for example, water) for cooling the rolling roll 14 to a predetermined portion on the outer peripheral surface 26 of the rolling roll 14. It is not preferable to adhere to. Here, the abrasive 28 is in contact with the outer peripheral surface 26 of the rolling roll 14 continuously in the axial direction of the rolling roll 14, and more on the rolling material than the position where the cooling liquid is supplied. If the abrasive 28 is disposed so as to be in contact with the outer peripheral surface 26 at a close position, the abrasive 28 can also function as the liquid draining material while removing foreign matter on the outer peripheral surface 26 or preventing foreign matter adhesion. Is possible.

  The present invention will be described more specifically with reference to the following examples. However, the scope of the present invention is not limited to these examples.

  The polishing performance by the difference of abrasives was examined.

[Example 1]
General-purpose novolac type phenolic resin (hexamine cured type) and silicon carbide particles (number # 320 as defined in JIS R6001 (1998), particle size (median diameter) 40 ± 2.5 μm at 50% cumulative height) are polyamide nonwoven fabrics The prepreg in the state included in was created. At that time, the polyamide nonwoven fabric was 42% by mass, the phenol resin was 30% by mass, and the silicon carbide particles were 28% by mass. This prepreg was laminated so that the final abrasive thickness was about 10 mm. Thereafter, pressurization and heating were performed under such conditions that the final abrasive density was 0.5 g / cm ³ . Thereafter, as necessary, the abrasive was cut into a rectangular parallelepiped having a length of 75 mm, a width of 20 mm, and a thickness of 10 mm.

Further, the density of the obtained abrasive was measured by an underwater substitution method and found to be 0.5 g / cm ³ . Moreover, when the density of the several part which cut out the suitable place of the abrasives was measured, all were substantially the same density. From this, it was found that the silicon carbide particles contained as the filler were sufficiently uniformly dispersed.

  The conditions and density of the prepreg composition (blending ratio, etc.) are shown in Table 1 below.

  The abrasive was fixed to an abrasion tester as shown in FIG. 2, and an abrasion test was performed.

  At that time, a roll having a cylindrical shape with a diameter of 100 mm and made of gray cast iron (FC200) and having a surface roughness Ra of 3 μm was used as a rolling roll.

  As polishing conditions, the rotation speed (circumferential speed) of the rolling roll was 1000 m / min, the polishing time was 8 hours (corresponding to the polishing distance: 480 km), and the linear pressure of the abrasive on the outer peripheral surface of the rolling roll was 0. Polishing was performed in a dry state at 028 kgf / mm.

[Examples 2 to 10]
Examples 2-10 are the same as Example 1 except having used the thing of the composition shown in Table 1 as said prepreg.

[Comparative Examples 1-4]
Comparative Examples 1-4 are the same except having used the composition shown in Table 1 as said prepreg.

In Table 1, E18S (210 g / m ² ) manufactured by Unitika Glass Fiber Co., Ltd. was used as the glass fiber fabric. Moreover, the bisphenol A type resin (1051-75M) by DIC Corporation was used for the epoxy resin. As the polyamide resin, NMC (general grade) manufactured by NAC KS Corporation was used. Further, silicon carbide particles # 220 defined by JIS R6001 (1998) were used as silicon carbide particles # 220. This # 220 (F220) has a mesh opening of 106 μm and a sieve having a mesh opening of 106 μm is 0% by mass, and a mesh having a mesh opening of 75 μm is less than 15% by mass. Those that remain are over 40% by mass, and those that remain in a sieve with a mesh opening of 45 μm are over 60% by mass. Therefore, the effective particle size is 45 to 75 μm, and the particle diameter (median diameter) at the 50% cumulative height is naturally in the range of 27 to 75 μm. As the alumina particles # 320, aluminum oxide particles having a count # 320 defined in JIS R6001 (1998) were used.

そして、上記各研磨材を用いた研磨に対して、以下の評価を行った。

And the following evaluation was performed with respect to grinding | polishing using said each abrasive material.

(Polishing effect: roll wear height)
The surface of the rolling roll before and after the polishing test was measured with a surface roughness measuring machine, and the wear height was calculated from the obtained roughness curve. The polishing effect was evaluated based on the wear height. Specifically, if the wear height is 6 μm or more, it is evaluated as “◎”, if it is 3.5 μm or more and less than 6 μm, it is evaluated as “◯”, and if it is 1 μm or more and less than 3.5 μm, It evaluated as "(triangle | delta)" and if it was less than 1 micrometer, it evaluated as "x". In Table 2, “None” in the wear height indicates that the wear height is approximately 0 μm, and “Fine” indicates that the wear height is less than 1 μm.

(Abrasion resistance: Abrasion wear)
The polishing amount of the abrasive after finishing polishing under the above conditions was measured by the above method. The abrasion resistance of the abrasive was evaluated based on this polishing amount. Specifically, if the wear amount is 25 mm ³ or less, it is evaluated as “◯”, and if it exceeds 25 mm ³ and 100 mm ³ or less, it is evaluated as “Δ”, and if it exceeds 100 mm ³ , “ “×”.

  The results are shown in Table 2.

表１及び表２からわかるように、ポリアミド不織布と、この不織布に含浸された、フェノール樹脂又はエポキシ樹脂等の熱硬化性樹脂の硬化物と、前記硬化物に分散された、炭化ケイ素及び酸化アルミニウムの少なくとも一方とを含む研磨材を用いた場合（実施例１〜１０）は、このような研磨材とは異なる研磨材を用いた場合（比較例１〜４）と比較して、圧延ロールに対する研磨効果が高かった。また、実施例１〜１４に係る研磨材は、圧延ロールに対する研磨に用いても摩耗が充分に抑制されていることがわかった。

As can be seen from Tables 1 and 2, a polyamide nonwoven fabric, a cured product of a thermosetting resin such as a phenol resin or an epoxy resin impregnated in the nonwoven fabric, and silicon carbide and aluminum oxide dispersed in the cured product When using an abrasive containing at least one of the above (Examples 1 to 10), compared to the case where an abrasive different from such an abrasive (Comparative Examples 1 to 4) is used, it corresponds to the rolling roll. The polishing effect was high. Moreover, even if it used for the grinding | polishing material which concerns on Examples 1-14 for grinding | polishing with respect to a rolling roll, it turned out that abrasion is fully suppressed.

  Moreover, when the mass ratio of the polyamide nonwoven fabric and the filler is fixed at 60:40 and the content of the thermosetting resin is reduced, the obtained abrasive does not become dense and the roll is polished. It was found that there was a tendency that an abrasive suitable for the above could not be obtained. Further, when the mass ratio is fixed at 60:40 and the content of the thermosetting resin is increased, it becomes difficult to hold the resin on the nonwoven fabric, and an abrasive suitable for polishing a rolling roll can be obtained. It turns out that there is no tendency.

L, L1, L2 Friction distance 2,14 Rolling roll 3,26 Outer peripheral surface of rolling roll 4,28 Abrasive material 10 Housing 11, 12 Rolling roll unit 16 Roll chock 18 Motor (rotary drive device)
20 Roll Roll Polishing Device 22 Rotating Shaft 24 Roll Body 30 Abrasive Material Operation Unit 32 Holder (Abrasive Material Holding Unit)
34 Supporting part 36 Load adjusting mechanism 80 Coolant supply part 101 Wear tester 102 Supporting bar

Claims (20)

A method for removing foreign matter on the outer peripheral surface or preventing adhesion of foreign matters by polishing the outer peripheral surface of a rolling roll having a cylindrical outer peripheral surface,
Rotating the rolling roll around the central axis of the outer peripheral surface;
Polishing the outer peripheral surface by bringing an abrasive into contact with the outer peripheral surface of the rotating rolling roll,
As the abrasive, a non-woven fabric containing polyamide fibers, a cured product of a thermosetting resin impregnated in the non-woven fabric, and a filler containing at least one of silicon carbide and aluminum oxide dispersed in the cured product are included. A rolling roll polishing method in which an abrasive is used. A method for polishing a rolling roll according to claim 1,
A method for polishing a rolling roll, wherein the abrasive has a density of 0.7 to 1.5 g / cm ³ . A method for polishing a rolling roll according to claim 1 or 2,
The content of the nonwoven fabric is 36 to 54 mass% with respect to the abrasive,
The grinding | polishing method of a rolling roll whose content of the said filler is 24-36 mass% with respect to the said abrasive. It is a grinding | polishing method of the rolling roll of any one of Claims 1-3,
A rolling roll polishing method, wherein the thermosetting resin is at least one of an epoxy resin and a phenol resin. It is the grinding | polishing method of the rolling roll of any one of Claims 1-4,
A rolling roll polishing method, wherein the filler has an average particle size of 27 to 75 µm. It is a grinding | polishing method of the rolling roll of any one of Claims 1-5,
The abrasive is in contact with the outer peripheral surface of the rolling roll at a friction distance of 1.00 mm or more, a linear pressure of 0.0035 kgf / mm or more and a surface pressure of 0.0035 kgf / mm ² or less. Polishing method for rolling rolls. It is a grinding | polishing method of the rolling roll of Claim 6, Comprising:
A method for polishing a rolling roll, wherein the outer peripheral surface is polished at a friction distance in which the abrasive is brought into contact with the outer peripheral surface of the rolling roll at a linear pressure of 0.0047 kgf / mm or more. A method for polishing a rolling roll according to claim 7,
A method for polishing a rolling roll, wherein the outer peripheral surface is polished at a friction distance in which the abrasive is brought into contact with the outer peripheral surface of the rolling roll at a linear pressure of 0.0065 kgf / mm or more. It is the grinding | polishing method of the rolling roll of any one of Claims 6-8,
A method for polishing a rolling roll, wherein the outer peripheral surface is polished at a friction distance in which the abrasive is brought into contact with the outer peripheral surface of the rolling roll at a surface pressure of 0.0018 kgf / mm ² or less. A method for polishing a rolling roll according to claim 9,
A method for polishing a rolling roll, wherein the outer peripheral surface is polished at a friction distance in which the abrasive is brought into contact with the outer peripheral surface of the rolling roll at a surface pressure of 0.0008 kgf / mm ² or less. An apparatus for removing foreign matter on the outer peripheral surface or preventing adhesion of foreign matters by polishing the outer peripheral surface of a rolling roll having a cylindrical outer peripheral surface,
An abrasive for polishing the outer peripheral surface of the rolling roll;
An abrasive material operating unit that polishes the outer peripheral surface by contacting the outer peripheral surface of the rotating rolling roll while holding the abrasive material,
The abrasive includes a nonwoven fabric containing polyamide fibers, a cured product of a thermosetting resin impregnated in the nonwoven fabric, and a filler containing at least one of silicon carbide and aluminum oxide dispersed in the cured product. An apparatus for polishing a rolling roll, which is an abrasive. A rolling roll polishing apparatus according to claim 11,
The polishing apparatus of a rolling roll whose density of the said abrasive is 0.7-1.5 g / cm < ³ >. A rolling roll polishing apparatus according to claim 11 or claim 12,
The content of the nonwoven fabric is 36 to 54 mass% with respect to the abrasive,
A rolling roll polishing apparatus, wherein a content of the filler is 24 to 36 mass% with respect to the polishing material. A rolling roll polishing apparatus according to any one of claims 11 to 13,
An apparatus for polishing a rolling roll, wherein the thermosetting resin is at least one of an epoxy resin and a phenol resin. It is a grinding device of a rolling roll given in any 1 paragraph of Claims 11-14,
An apparatus for polishing a rolling roll, wherein the filler has an average particle size of 27 to 75 µm. A rolling roll polishing apparatus according to any one of claims 11 to 15,
The abrasive operation unit includes an abrasive holding unit that holds the abrasive, a contact position where the abrasive contacts the outer peripheral surface of the rolling roll, and a spaced position where the abrasive is separated from the outer peripheral surface. A rolling roll polishing apparatus comprising: a support portion that supports the abrasive holding portion so that the abrasive holding portion can be moved. A rolling roll polishing apparatus according to claim 16,
The polishing material polishing unit further includes a load adjusting mechanism that changes a load for bringing the polishing material into contact with an outer peripheral surface of the rolling roll. A rolling roll unit that is detachably attached to a housing of a rolling mill,
A rolling roll having a rotating shaft and a roll body disposed around the rotating shaft, the roll body having a cylindrical outer peripheral surface centering on the rotating shaft;
A roll chock attached to both ends of the rotary shaft, which is detachably attached to the housing and rotatably supports the rotary shaft in the mounted state;
A rolling roll polishing apparatus according to any one of claims 11 to 17,
In the rolling roll polishing apparatus, the abrasive of the rolling roll polishing apparatus can contact the outer peripheral surface of the roll body of the rolling roll, and the rolling roll polishing apparatus is integrated with the rolling roll and the roll chock in the housing. A rolling roll unit attached to the roll chock so as to be attached to and detached from the rolling chock. A rolling mill,
A rolling roll having a cylindrical outer peripheral surface;
A housing for supporting the rolling roll;
A roll chock that is interposed between the rolling roll and the housing and allows rotation about the central axis of the rolling roll;
A rotation driving device for rotating the rolling roll;
A rolling roll polishing apparatus according to any one of claims 11 to 17,
This rolling roll polishing apparatus is a rolling mill attached to the roll chock or the housing so that the abrasive of the rolling roll polishing apparatus can come into contact with the outer peripheral surface of the rolling roll. The rolling mill according to claim 19, wherein
A cooling liquid supply unit for supplying a cooling liquid for cooling the rolling roll onto the outer peripheral surface of the rolling roll;
The abrasive is a plate extending along the axial direction of the rolling roll, has a shape that can continuously contact the outer peripheral surface of the rolling roll in the axial direction, and the abrasive is cooled by the cooling roll. A rolling mill, which is disposed so as to come into contact with the outer peripheral surface of the rolling roll at a position closer to the rolling material than a supply position of a cooling liquid by a liquid supply unit.

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