JPH06335716A - Grinding device for on line rolling roll - Google Patents

Abstract

PURPOSE:To prevent the chattering phenomenon and resonance from being caused and efficiently use the power of a grinding device by absorbing the vibration of a rolling roll through the elastic body function of a thin plate disk of grinding wheel and grinding from one end to the other end of the roll to one working roll with one grinding unit. CONSTITUTION:The grinding wheel 20 is provided with the thin plate disk 52 mounted on the rotary axis of the grindstone and the grindstone powder layer 51 fixed to its one side, while the thin plate disk 52 has the elastic body function absorbing vibratory energy from the rolling roll 1a. A sliding rail 7 is moved by a rail moving device 30, the sliding rail 7 is inclined to the axial center Rc of the rolling roll and when a grinding unit lies on one end side of the rolling roll 1a and when it lies on the other end side, an actuator means is driven so that the sliding rail 7 is inclined theta deg. in the opposite direction to the axial center Rc of the rolling roll. Further, a grindstone feed-device is driven so that the grinding wheel 20 moves in parallel with the axial center of the rolling roll. Consequently, the chattering and resonance are prevented from being caused and grinding excellent in precision and surface roughness is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill, and more particularly to an on-line rolling roll grinding machine installed in a plate rolling mill,
In particular, the present invention relates to an on-line rolling roll grinding device that effectively grinds a rolling roll without being affected by vibration of the rolling roll.

[0002]

2. Description of the Related Art Generally, when a slab material is rolled by a rolling roll of a plate rolling machine, only a rolling portion is worn and a step difference from a non-rolling portion is generated. For this reason, there are rolling restrictions, such as rolling in order from a wide slab to a narrow slab. In order to solve this problem, many technologies and control methods for online roll grinders have been proposed.

For example, Mitsubishi Technique 1988 Vol. 25,
No. According to 4 "Development of Online Roll Grinder" and Japanese Utility Model Laid-Open No. 62-174705, a plurality of rotary grindstones are arranged on one rolling roll, and the plural rotary grindstones are installed in an integral frame. While the whole frame always moves within a certain range, the rotary grindstone is not actively driven by the motor, but is driven (rotated) by using the rotational force of the rolling roll to grind the entire surface of the rolling roll ( Hereinafter referred to as the first conventional technology).

Further, in the specification of Japanese Utility Model Application Laid-Open No. 58-28705, one rolling roll grinding unit is arranged on one rolling roll, and rolling is performed on the opposite side of the rolling grinding unit with the rolling rolls sandwiched therebetween. A technology to bring contact rolls of a position sensor into contact with the necks of both ends of the roll, detect the deviation of the axial center of the rolling roll with this position sensor, and control the feeding device so that the rotating grindstone follows the deviation is described. (Hereinafter, referred to as the second conventional technology).

[0005] In addition, in "Accurate constant pressure grinding of rolling rolls", a collection of lecture papers of the 1992 Spring Meeting of the Japan Society for Precision Engineering, the abrasive grain layer of a cup-type rotary grindstone is a cubic boron nitride (CBN) grind. It has been reported that the result of an experiment was carried out by grinding the rolling roll by arranging it with grains and arranging the rotation axis of the rotating grindstone so as to be substantially orthogonal to the rolling roll (hereinafter, referred to as a third conventional technique).

Further, in the specifications of Japanese Utility Model Laid-Open No. 58-28706 and Japanese Utility Model Laid-Open No. 62-95867, a cup-type rotary grindstone arranged so as to be substantially orthogonal to a rolling roll is disclosed.
A technique is described which is attached to a grindstone rotating shaft so as to be slidable in the axial direction, and the back surface of the grindstone is axially supported by an elastic body directly or via a boss to absorb rolling roll vibration (hereinafter , Referred to as the fourth prior art).

Further, Japanese Laid-Open Patent Publication No. 61-242711 discloses the same grinding method as the above-mentioned first conventional technique,
It is described that only one grindstone is used for grinding one roll, and the grinding surface of the grindstone is inverted in the vicinity of the center of the roll shaft in order to grind the entire length of the roll (hereinafter referred to as the fifth conventional method). Technology).

On the other hand, in an online roll grinding apparatus provided in a cross rolling machine for rolling with an angle formed by the axes of a pair of upper and lower work rolls being inclined in a horizontal plane from a right angle to the rolling direction, the grinding body is followed by the work rolls. An example of a device for moving the above in a horizontal plane is described in JP-A-61-88907. This is equipped with fixed cushions and free cushions that come into contact with the work roll chock at the left and right ends of the frame that houses the grinding body. These two cushions allow the frame to follow the work roll chock, and the grinding body that comes into contact with the work rolls at both ends of the frame. The hydraulic pressure is supplied to the two cushions in correspondence with the rotational moment generated from the difference in the pressing reaction force to balance the rotational moments (hereinafter referred to as the sixth prior art).

[0009]

The rolling rolls of a rolling mill are held by bearings incorporated in a bearing box and rotate at high speed. This bearing box has a gap between its inner and outer diameters to facilitate the exchange of rolling rolls and bearings. The rolling roll rotates while moving back and forth between the gaps during rotation. In addition to that, the cylindrical portion of the rolling roll has a center misalignment with respect to the bearing portion, and there is a vertical movement of the rolling roll by the rolling down device during plate rolling. These are superposed, and the rolling roll is constantly rotating while vibrating.

Generally, when machining a cylindrical work piece, the work piece to be ground is supported by a center that rotates with high precision, and the work piece is ground with the vibration thereof minimized. However, when it is attempted to grind a rolling roll in a rolling mill during rolling, it is impossible to grind in a state where vibration is extremely small like a normal workpiece. The rolling roll during rolling usually has an amplitude of 20 μm to 60 μm, 1G to 2G
It is rotating while vibrating with some acceleration. In this state, the online roll grinding machine must grind accurately.

In the above-mentioned first to third and fifth conventional techniques,
When the vibrating rolling roll is ground as described above, unevenness due to chattering occurs on the rolling roll surface. Further, the grindstone is also significantly consumed by the impact force due to the chattering phenomenon, the life of the grindstone is shortened, and it becomes necessary to frequently replace the grindstone. Further, it is difficult to control the contact force when the rolling roll is ground into a predetermined profile.

Further, in the first prior art, since the grindstone is rotated together with the rotating force of the work roll, the grinding ability per grindstone is not high. for that reason,
One work roll requires about 6 solid grinding bodies. In a rolling machine having a short roll length, there is no space for moving a frame accommodating a plurality of grinding bodies in the roll axial direction. In the fifth conventional technique, since one grindstone is rotated together, the grinding ability is further reduced.

In the fourth conventional technique, an elastic body is used to absorb the vibration of the rolling roll. However, in this conventional technique, since the whole grindstone including the grindstone base metal is supported by the elastic body and moves back and forth, there is a problem that the mass of the movable part of the grindstone, that is, the weight of the part that moves following the vibration is heavy. Even when cubic boron nitride (CBN) abrasive grains with a high grinding ratio are used as the abrasive grains of the grindstone, the movable part mass supported by the elastic body and moving back and forth has a grindstone diameter of 250 mm, a grindstone, a slide bearing, and a seal. Including parts, it will be at least 5 kg or more. Further, the spring constant of the elastic body must be set to 130 Kgf / mm if the contact force change allowable value between the rolling roll and the grindstone is 4 Kgf and the vibration amplitude of the rolling roll is 30 μm. Under this condition, the natural frequency of the movable part including the elastic body is calculated to be 80 c / s. At this low natural frequency, the vibration of the rolling roll causes the movable part including the elastic body to resonate, which causes chatter marks on the roll surface, and the abrasion of the grindstone becomes faster. If the diameter of the grindstone is made small and the mass of the movable part is made small, the grinding ability is greatly reduced.

The cup-shaped grindstone is slidable in the axial direction of the grindstone rotating shaft, and the back surface of the grindstone is supported by an elastic body. However, cooling water, grinding dust, etc. are scattered around the grindstone during roll grinding, and these move into the gap between the grindstone and the grindstone rotating shaft from the seal part attached to the vibrating grindstone to allow the grindstone to move smoothly. It is difficult to stably function as an elastic body for a long time.

On the other hand, in the sixth prior art relating to the roll grinder of the cross rolling mill, the cushions provided at both ends of the frame try to absorb vibrations from the rolling rolls, but the mass of the movable portion is large, Similar to the fourth prior art, there are problems that the movable part resonates, unevenness occurs due to chattering phenomenon on the surface of the rolling roll, and the life of the grindstone is shortened.

Further, since the grinding body is not rotating in this grinding apparatus, a large pressing force is required for grinding, and the reaction force is unbalanced at both ends of the frame containing the grinding body. In order to balance it and follow the roll cross angle, two cushions are needed and the hydraulic pressure injected into these cushions must be properly controlled. Therefore, there is a problem that the structure becomes complicated.

A first object of the present invention is to provide an on-line rolling roll grinding apparatus capable of absorbing vibrations from rolling rolls and causing chattering phenomenon accurately and capable of performing grinding with a good rolling roll surface roughness. .

A second object of the present invention is to provide an on-line rolling roll grinding device capable of grinding both ends of a rolling roll with one grinding unit.

A third object of the present invention is to provide an on-line rolling roll grinding apparatus which can move the grinding unit by following the cross angle of the rolling roll with a simple structure.

[0020]

In order to achieve the above first and second objects, according to the present invention, one grinding unit installed for one rolling roll in a rolling mill, and And a sliding rail that supports the grinding unit so that the grinding unit is movable in the axial direction of the rolling roll, the grinding unit is a disk-shaped rotary grindstone for grinding the rolling roll, and a drive device that rotates the rotary grindstone by a grindstone rotating shaft. A feed device for pressing the rotary grindstone against the rolling roll, an online rolling roll grinder having a traverse device for moving the grinding unit along the sliding rail, wherein the rotary grindstone is attached to the grindstone rotating shaft. A thin disk and an abrasive grain layer fixed to one side surface of the thin disk, the thin disk for absorbing vibrations from the rolling rolls. Having a physical body function, actuator means provided on at least one end of the sliding rail for inclining the sliding rail with respect to the axis of the rolling roll, and the grinding unit grinding one end side of the rolling roll. The actuator means so as to incline the sliding rail in the opposite direction with respect to the axis of the rolling roll depending on the position where the sliding rail and the other side are ground, and the sliding rail. And a control means for driving the grindstone feeding device and the traverse device so that the rotating grindstone moves in parallel to the axial center of the rolling roll with respect to a change in the distance between the axial center of the rolling roll and A featured on-line rolling roll grinding machine is provided.

The abrasive grain layer preferably comprises cubic boron nitride abrasive grains or diamond abrasive grains.

Further, in order to achieve the above first and third objects, according to the present invention, it is installed for one rolling roll in a cross rolling machine in which a pair of rolling rolls are horizontally crossed. And at least two grinding units and a slide rail for movably supporting the grinding unit in the axial direction of the rolling roll, wherein the grinding unit is a disk-shaped rotary grindstone for grinding the rolling roll. In an online rolling roll grinding device having a driving device that rotates a grindstone by a grindstone rotating shaft, a feeding device that presses the rotating grindstone on the rolling roll, and a traverse device that moves the grinding unit along the sliding rail,
The rotating grindstone has a thin plate disk attached to the grindstone rotating shaft, and an abrasive grain layer fixed to one side surface of the thin plate disk, and the thin plate disk absorbs vibration from the rolling roll. The elastic body function, and further includes a follow-up moving unit that moves the slide rail so as to follow the cross angle of the rolling roll so that the slide rail is parallel to the axis of the rolling roll. An on-line rolling roll grinding device is provided.

The follow-up moving means is preferably an actuator means for moving the sliding rail in the radial direction of the rolling roll, and the sliding rail is based on the information about the cross angle of the rolling roll. Control means for driving the actuator means so as to be parallel to the heart.

The rolling mill has operating-side and driving-side cross blocks that come into contact with and press the bearing boxes that support both ends of the rolling roll, and the follow-up moving means sets both ends of the sliding rails. There may be provided actuator means that is brought into contact with the operation side and drive side cross blocks to enable the sliding rails to move integrally with the cross blocks.

The abrasive grain layer preferably comprises cubic boron nitride abrasive grains or diamond abrasive grains. The rotary grindstone is preferably arranged such that the contact line between the abrasive grain layer and the rolling roll is formed only on one side when viewed from the center of the grindstone.

[0026]

With respect to the first object of the present invention, the applicant of the present application has positioned one of a pair of rolling rolls facing one another in Japanese Patent Application No. 4-142971 (filing date June 3, 1992). Then, a disk-shaped rotating grindstone for grinding the rolling roll, a drive device for rotating the rotating grindstone by a grindstone rotating shaft, a feeding device for pressing the rotating grindstone onto the rolling roll, and moving the rotating grindstone in the axial direction of the rolling roll. In a rolling mill equipped with an online roll grinding device having a traverse device to
The rotating grindstone has a thin plate disk attached to the grindstone rotating shaft, and an abrasive grain layer fixed to one side surface of the thin plate disk, and the thin plate disk absorbs vibration from the rolling roll. It was proposed that the structure has the elastic body function of.

Regarding the arrangement of the rotary grindstone,
A minute angle with respect to a direction perpendicular to the axis of the rolling roll so that the contact line between the abrasive grain layer and the rolling roll is formed only on one side in the roll axial direction when viewed from the center of the grinding stone. Proposed tilted placement.

In the above-mentioned prior invention, the thin disk, which is a part of the disk-shaped rotary grindstone, has an elastic function, so that when the rotary grindstone is pushed by the vibration of the rolling roll, the thin disk flexes and Instantly absorbs the vibration of. As a result, the fluctuation of the contact force between the abrasive grain layer and the rolling roll falls within the small range of the elastic force generated by the bending of the thin disk, and the chattering phenomenon can be eliminated. Further, a thin disk, which is a base metal for supporting the abrasive grain layer, has an elastic body function, and the abrasive grain layer and the elastic body functional member are integrated. Therefore, the mass that can be moved by the vibration from the rolling roll is only the abrasive grain layer and the thin disk, the mass of the movable part is extremely small, and the natural frequency of the rotary grindstone is high. Therefore, the vibrating rolling roll can be properly ground for a long time without causing chattering due to resonance.

Further, by tilting the grindstone rotation axis and arranging the rotary grindstone so that the contact line between the abrasive grain layer and the rolling roll is formed only on one side from the center of the grindstone, the pressing force to the rolling roll is exerted. The thin disk is bent in the form of a cantilever, the elastic function of the thin disk is effectively exerted, and the vibration from the rolling roll can be easily absorbed. Further, since the contact line is formed at one location on one side of the center of the grindstone, the chattering phenomenon is further prevented.

The grinding apparatus of the present invention utilizes the above-mentioned prior invention and operates in the same manner as the prior invention. That is, it is possible to perform accurate grinding with good surface roughness of the rolling roll without absorbing vibrations from the rolling roll and causing chattering.

With respect to the second object of the present invention, there is a machine such as a threading guide, which essentially constitutes a rolling machine, in the vicinity of the work rolls of the rolling machine, and the grinding unit of the on-line rolling roll grinding machine is arranged here. At this time, it is necessary to avoid interference with these devices, and therefore, it is desirable that the entire length of one rolling roll can be ground by one grinding unit. In order to grind the entire length of the rolling roll with one grindstone, it is necessary to improve the grindability per grindstone so that the grinding capacity of one grindstone exceeds the grinding amount required to reduce the step created on the roll. is necessary.

It has been confirmed that the rotary grindstone of the above-mentioned prior invention exhibits a high grinding ability by inclining the grindstone rotation axis and grinding the contact line at one place, and one rotary grindstone having the rotary grindstone is used. By providing the grinding unit on one rolling roll, both ends of the rolling roll can be ground.

By the way, when the grindstone rotation axis is tilted as described above, the grinding surface side (contact line side) of the grindstone can grind to the roll end portion, but the anti-grinding surface side grinds to the roll end portion. The diameter section must move outwards. In this case, since there is a bearing box and a stand at the roll end, the grindstone interferes with them, and there is a problem that the roll end cannot be ground (see FIG. 7). By changing the grinding surface by reversing the inclination of the grindstone rotation axis on one end side and the other end side of the roll, it is possible to grind up to the end part of the roll with one grindstone. However, if a tilting device that changes the inclination of the grindstone rotation axis is provided, the device configuration of the grinding unit becomes large, and if a tilting device is provided in the grinding unit, the tilting device is provided before the grindstone moves to the roll end. Problems such as interference with the bearing box occur.

In the present invention, the actuator means provided at at least one end of the sliding rail is operated to incline the sliding rail with respect to the axis of the rolling roll, whereby the grindstone rotating shaft is inclined with respect to the roll axis. The angle changes and the grinding surface of the grindstone can be easily changed. That is,
The actuator is actuated by the control means so that the sliding rail is tilted in the opposite direction with respect to the axis of the rolling roll when the grinding unit is in the position for grinding one end of the rolling roll and in the position for grinding the other end. By driving the means
The inclination of the grindstone rotation shaft is opposite between the one end side and the other end side of the roll, so that the grinding stone does not interfere with the bearing box or the stand, and the end portion of the roll can be ground. Further, when the sliding rail is tilted in this way, the sliding rail and the rolling roll are no longer parallel to each other, and the distance between the rotary grindstone and the roll shaft center changes and the amount of grinding changes, but in the present invention, By driving the grindstone feeding device by the control means so that the rotary grindstone moves parallel to the axis of the rolling roll with respect to the change in distance, the moving direction of the rotary grindstone is corrected and the desired grinding amount is obtained. Thus, the contact force between the rolling roll and the rotating grindstone is controlled.

With respect to the third object of the present invention, when two or more grinding units are attached to a cross rolling machine in which upper and lower work rolls cross each other and grinding is performed, the sliding rail is parallel to the axis of the rolling roll. By moving the sliding rail following the cross angle of the rolling roll with the following moving means, the roll can be easily ground to both ends of the roll while moving the grindstone following the cross angle with a simple configuration. it can.

That is, based on the information about the crossing angle of the rolling roll and the actuator means for moving the sliding rail in the radial direction of the rolling roll, the sliding rail becomes parallel to the axis of the rolling roll. By configuring it with the control means for driving the actuator means, the grindstone can be moved following the cross angle.

Further, the follow-up moving means is constituted by an actuator means which allows both ends of the sliding rail to come into contact with the operating side and driving side cross blocks to move the sliding rail integrally with the cross block. Also, the grindstone can be moved by following the cross angle.

[0038]

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

First, a first embodiment of the present invention will be described with reference to FIGS.
The description will be made using 0.

In FIG. 1 and FIG. 2, the rolling mill according to this embodiment has a pair of rolling rolls (upper and lower work rolls) 1a, 1a for stretching a rolled material S and a pair of rolling rolls for supporting the rolling rolls 1a, 1a. (Upper and lower reinforcing rolls) 1b (only one is shown). Rolling roll 1
a and 1a are held by bearing boxes 3 and 3, and these bearing boxes 3 and 3 are incorporated in a stand 4 on the operating side and the driving side. An entrance side guide 10 is arranged on the entrance side of the rolling mill to guide the rolled material S to the rolling roll 1a. A coolant header 15 (only one is shown) for cooling the heat of the rolling rolls 1a, 1a generated during rolling is provided to cool the heat of the rolling rolls 1a, 1a generated during rolling.

The on-line rolling roll grinding device of this embodiment is provided in such a rolling mill. The online rolling roll grinding device has one grinding unit 5 provided for one work roll 1a.

The grinding unit 5 is, as shown in FIGS. 3 and 4, a disk-shaped rotary grindstone 2 for grinding the work roll 1a.
0, a drive device 22 for rotating the rotary grindstone 20 by a grindstone rotating shaft 21, a feeding device 23 for pressing the rotary grindstone 20 against the work roll 1a, and a traverse device 24 for moving the rotary grindstone 20 in the axial direction of the work roll 1a. There is.

As shown in the enlarged view of FIG. 5, the rotary grindstone 20 includes a thin disk 52 having a boss 52a and a thin disk 52.
Has a ring-shaped abrasive grain layer 51 fixed to the side surface on the side opposite to the boss.
Installed on. Further, the thin disk 52 has an elastic body function for absorbing the vibration from the work roll,
The structure is such that the amount of bending changes depending on the contact force between the work roll 1a and the abrasive grain layer 51. The thin disk 52 is preferably 1000 kgf / mm to 30 kgf because of its elastic function.
/ Mm spring constant, more preferably 500 Kgf / mm
It has a spring constant of -50 Kgf / mm. Abrasive layer 5
The reference numeral 1 is made integral with the thin disk 52 by an adhesive so that it can be brought into stable contact with the vibrating work roll 1a.

The abrasive grain layer 51 is made of cubic abrasive boron nitride abrasive grains (generally called CBN) or diamond abrasive grains which are superabrasive grains, and the concentration of the abrasive grains is 50 to 10.
It is set to 0 and the grain size of the abrasive grains is in the range of 80 to 180, and is hardened by using a resin bond as a binder. Further, the material of the thin disk 52 is made of aluminum material or aluminum alloy for the purpose of easily radiating the grinding heat from the superabrasive grains of the abrasive grain layer 51 and for reducing the mass of the movable portion.

As shown in FIG. 5, the rotary grindstone 20 is arranged such that the axis Gc1 of the grindstone rotary shaft 21 is inclined by a small angle α with respect to a line Sc perpendicular to the axis Rc of the work roll 1a. The contact line between the layer 51 and the work roll 1a is formed only on one side when viewed from the center of the grindstone. Inclination angle α
Is preferably about 0.5 ° to 1.0 °. With such an arrangement of the rotary grindstone 20, the thin disk 52 can effectively exhibit the elastic body function.

As shown in FIG. 3, the drive unit 22 includes a liquid motor 54 (which may be an electric motor) for rotatably driving the rotary grindstone 20 to a predetermined grindstone peripheral speed, and a liquid motor 54.
The output shaft 54a has a pulley shaft 54b and a belt 55 for transmitting the rotation to the grindstone rotating shaft 21, and the output shaft 54a and the pulley shaft 54b are connected via a parallel spline 54c. The pulley shaft 54b is a body 59
It is rotatably supported by. The grindstone rotating shaft 21 is connected to the body 59 via slide-type radial bearings 21a and 21b.
It is rotatably and axially movably supported therein. A load cell 53 for measuring the contact force between the rotary grindstone 20 and the work roll 1a is housed in the body 59 on the side opposite to the grindstone rotary shaft 21.

The body 59 is housed in the case 25, and the hydraulic motor 54 is mounted in the case 25. In addition, the body 59, as shown in FIG.
It is mounted on the bottom of No. 5 via a slide bearing 25a so as to be movable in the axial direction of the grindstone rotating shaft 21.

As shown in FIG. 3, the feed device 23 moves the feed motor 57 attached to the case 25 and the body 59 by the rotation of the feed motor 57 toward and away from the work roll 1a to rotate the rotary grindstone 20, It has a backlashless type preload type ball screw 56 that feeds the grindstone rotating shaft 21 and the load cell 53 back and forth together, and an encoder 57a that detects the rotation angle of the feed motor 57. A backlashless type gear mechanism may be used instead of the preload type ball screw 56.

As shown in FIG. 4, the traverse device 24 includes a traverse motor 58 attached to the case 25.
A pinion 58a that is mounted on the rotary shaft of the traverse motor 58 and meshes with the rack 14, two pairs of guide rollers 26 that are mounted on the upper surface of the case 25 and that engage with the sliding rails 7, and the rotation speed of the traverse motor 58. And an encoder 58b for detecting As shown in FIGS. 1 and 2, the sliding rail 7 is provided on the entrance side of the work roll 1a along the axis of the work roll 1a, and
4 is formed on the side surface of the slide rail 7 on the side opposite to the work roll. As described above, the grinding unit 5 includes the guide roller 26.
While being supported by the slide rail 7 via the, the traverse motor 58 and the pinion 58a and the rack 14 mesh with each other so that the traverse motor 58 can move smoothly in the roll axis direction.

The roll grinding unit 5 includes the work roll 1a.
It is necessary to avoid interference with the bearing box 3 when replacing For this reason, both ends of the slide rail 7 are slidably supported by the guides 9 mounted on the stand 4, and the grinding unit 5 is provided on both ends of the slide rail 7 on the operation side and the drive side. Sliding rail 7 by moving device 30
It can be moved backwards with. Each sliding rail moving device 30 is composed of a worm screw 31, a motor 32 for driving the worm screw 31, and a motor encoder 33, and a tip of a screw shaft 31 a of the worm screw 31 is pin-connected to the sliding rail 7.

The feed motor 57 of the feed device 22, the traverse motor 58 of the traverse device 24, and the motor 32 of the slide rail moving device 30 are controlled by the control devices 13a, 13b, 13d, respectively, as shown in FIG. Also,
The detection signals of the load cell 53, the encoder 57a of the feeding device 23, the encoder 58b of the traverse device 24, and the motor encoder 33 of the sliding rail moving device 30 are sent to the information processing device 13c and processed.

The sliding rail moving device 30 includes the sliding rail 7
Is configured with respect to the axis of the rolling roll 1a, and regarding the arrangement of the rotary grindstone 20 described above, the inclination of the grindstone rotating shaft 21 with respect to the axis Rc of the work roll 1a is the sliding rail 7. It is given by the slope.

Information processing device 13c, control devices 13a, 1
3b, 13d and encoders 33, 57a, 58b roll the sliding rail 7 when the grinding unit 5 is in a position to grind one end side of the rolling roll 1a and when it is in a position to grind the other end side. The sliding rail moving device 30 is driven so as to be tilted in the opposite direction to the axis of the rolling roll 1a, and the rotary grindstone 20 moves the axis of the rolling roll 1a against the change in the distance between the sliding rail 7 and the axis of the rolling roll 1a. A control means for driving the grindstone feeding device 22 so as to move parallel to the center is configured.

Next, the operation and control of the on-line rolling roll grinding apparatus of this embodiment will be described. First, the operation of the rotary grindstone 20 in the online rolling roll grinding apparatus of this embodiment will be described.

Although the work roll 1a depends on the rolling speed, 10
It vibrates while having a frequency of 150 C / S.
When a roll grinder having a general cylindrical grindstone is attached to a conventional offline grinder as an online grinder, the cylindrical grindstone and the work roll contact each other through the abrasive grains on the surface of the grindstone, and the metal and the abrasive grains on the roll surface are Grinding while hitting.

When the abrasive grains come into contact with the surface metal of the work roll, the work roll is ground, and the next instantaneous grindstone separates from the work roll and the abrasive grains are emptied and rotated. Such discontinuous grinding causes chattering, resulting in uneven work roll surface and cross section.

If the grindstone vibrates the same as the vibration of the work roll, the contact force between the grindstone and the work roll does not change. However, vibrating the grindstone and the entire grindstone frame so as to synchronize with the work roll results in a work roll vibration of 150 c / s.
It is difficult to follow because of high frequency. If the whetstone itself does not try to escape the vibration of the work roll by the entire whetstone and grindstone frame, and the whetstone itself has an elastic function to absorb the vibration by the bending of the whetstone, the mass of the movable part becomes smaller And the fluctuation of the contact force between the grindstone and the work roll is reduced.

In the present embodiment, the thin disk 52, which is a part of the rotary grindstone 20, has the elastic body function, so that the grindstone itself has the elastic body function. Is 1000m / min to 1600m / mi at the outer circumference
While rotating so as to be n, the work roll 1a is pressed and bent. The work roll 1a vibrates back and forth as described above. The rotary grindstone 20 is pushed by this vibration, but at that time, the thin plate disk 52 bends as shown in FIG. 5, and the vibration from the work roll 1a is instantly absorbed. As a result, the fluctuation of the contact force between the abrasive grain layer 51 and the work roll 1a falls within a small range of the elastic force generated by the bending of the thin disk 52, and the chattering phenomenon can be eliminated.

When the grindstone itself has an elastic function, it is difficult to give the grindstone itself an elastic function because the work roll and the grindstone rotation axis are arranged in parallel in the cylindrical grindstone. However, in the case of a disk-shaped grindstone, since the work roll and the grindstone rotation axis form a substantially right angle, it becomes easy to give the grindstone itself an elastic body function. Therefore, it is effective to use a disk-shaped grindstone for grinding the vibrating work roll.

That is, in this embodiment, the thin disk 52, which is the base metal of the abrasive grain layer 51, has an elastic function. Also,
In order to effectively exhibit the elastic body function, as shown in FIG. 5, the rotary grindstone 20 is arranged so that the contact line between the abrasive grain layer 51 and the work roll 1a is formed only on one side from the center of the grindstone. . By doing so, the thin plate disk 52 is bent in the form of a cantilever by the pressing force to the work roll 1a, and the vibration from the work roll 1a can be absorbed.

Since the abrasive grain layer 51 has an annular shape,
Even if the rotary grindstone 20 is pressed parallel to the work roll 1a,
The thin disk 52 can be bent by being supported by two abrasive grain layer portions on both sides of the center of the grindstone. However, in this case, since both ends are supported, the amount of bending is reduced. If it is supported at one place as in the present embodiment, the same thin plate disk 52 can be used to obtain a larger deflection.

The grindstone has an allowable change range of the contact force between the work roll and the grindstone depending on the grinding ability of the abrasive grains. When the grindstone itself has an elastic function, the following conditions are necessary for the contact force to be properly maintained within the permissible change range and the grindstone not to resonate even if the work roll vibrates.

F ≧ K × Amax F: Allowable change range of contact force Amax: Work roll piece amplitude K: Spring constant of elastic body That is, K ≦ F / Amax, and the spring constant of the elastic body of the grindstone itself contacts the grindstone. If it is smaller than the spring constant K obtained from the allowable change range F of force and the work roll piece amplitude Amax, the grindstone can always follow the work roll and grind.

On the other hand, when the natural frequency of the grindstone matches the frequency of the work roll, the grindstone resonates and accurate grinding cannot be performed. Therefore, the natural frequency of the grindstone should be set as far away as possible from the frequency of the work roll.

Fn> Frmax Fn: Natural frequency of grindstone Frmax: Maximum frequency of work roll The natural frequency of the grindstone is expressed by the following formula.

[0066]

[Equation 1]

M: Mass of a grindstone including an elastic body (mass of a movable part) Therefore, when increasing the natural frequency of the grindstone, the spring constant K of the elastic body is increased or the mass M of the grindstone including the elastic body is increased.
Must be small. The spring constant of the elastic body cannot be made larger than a certain value (F / Amax) as described above. To increase the natural frequency of the grindstone, the mass of the grindstone including the elastic body must be reduced.

For example, F = 4 Kgf, Amax = 30 μ
When m, K = 133 Kgf / mm. Therefore,
Assuming that Frmax = 150 c / s and Fn = 400 c / s, the mass M of the movable part including the rotary grindstone must be suppressed to 0.2 kg.

In the case of a grindstone using aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) type abrasive grains generally used as a grindstone, if the grindstone mass is suppressed to 0.2 kg, the grindstone will be It will be consumed and it will be necessary to replace the grindstone many times a day, and the effect of work roll grinding in the rolling mill will be greatly impaired.

In order to solve this problem, it is necessary to use a grindstone having a high grinding ratio (workpiece reduction volume / grinding wheel reduction volume).

Aluminum oxide (Al ₂ O
₃ ) or a grindstone using silicon carbide (SiC) type abrasive grains,
It is difficult to increase the grinding ratio to 3 or more by grinding hard work rolls. However, the rotary grindstone 20 of the present embodiment, which is made by using super-abrasive grained boron nitride abrasive grains (generally called CBN) or diamond abrasive grains, grinds the work roll 1a. Also has a grinding ratio of more than 300, which is 100 times or more that of a grindstone using aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) abrasive grains. By utilizing this high grinding ratio of superabrasive grains and using these abrasive grains as a grindstone of an online roll grinding device, it becomes possible to grind for a long time with a small weight.

Further, in this embodiment, the base metal having the abrasive grain layer 51 is used as a thin plate disc 52, and the thin plate disc 52 is provided with an elastic body function so that the abrasive grain layer 51 and the elastic body function member are integrated. There is. Therefore, the mass that can be moved by the vibration from the work roll 1a is only the abrasive grain layer 51 and the thin disk 52, and the mass of the movable part can be made extremely small, and the natural frequency of the rotary grindstone 20 can be increased.

As described above, in this embodiment, in order to reduce the mass of the movable part, superabrasive grains having a high grinding ratio (light weight and long tool life) are used for the abrasive grain layer 51 and have an appropriate spring constant. Since the rotary grindstone 20 integrated with the thin disk 52 is pressed against the work roll 1a while rotating, the vibrating work roll can be properly ground for a long time without causing chattering due to resonance.

Further, in this embodiment, one rolling roll 1a is used.
In order to grind the entire length of the rolling roll 1a with one grinding unit (one grindstone), the grinding ability of one grindstone causes a step difference in the roll. It is necessary to improve the grinding ability for each grindstone so as to exceed the grinding amount required for shaving. The above-mentioned rotary grindstone 20 exhibits a high grinding ability by tilting the grindstone rotating shaft 21 so that the contact line is one place, and one grinding unit 5 can grind both ends of the rolling roll.

Next, control of the on-line rolling roll grinding apparatus of this embodiment will be described. In this embodiment, the grindstone rotating shaft 21 is tilted as described above, and the contact line is set at one location for grinding. When the grindstone rotating shaft 21 is tilted in this way, the grinding surface side (contact line side) of the grindstone can be ground to the roll end, but the anti-grinding surface side tries to grind to the roll end, the diameter part of the grindstone moves outward. I have to move. In this case, as shown in FIG. 7, since there is the bearing box and the stand 4 at the roll end, the grindstone interferes with these, and there is a problem that the roll end cannot be ground. By changing the grinding surface by reversing the inclination of the grindstone rotating shaft 21 on one end side and the other end side of the roll,
Can roll up to the end of the roll with one grindstone. However, if the tilting device that changes the tilt of the grindstone rotating shaft 21 is provided, the device configuration of the grinding unit becomes large, and if the tilting device is provided in the grinding unit, the tilting device is provided before the grindstone moves to the roll end. May interfere with the bearing box.

In this embodiment, the inclination angle of the grindstone rotating shaft 21 with respect to the roll axis is changed by operating the slide rail moving device 30 to incline the slide rail 7 with respect to the axis of the rolling roll 1a. Therefore, the grinding surface of the grindstone can be easily changed, and the sliding rail moving device 30, the grindstone feeding device 22, and the traverse device 24 are controlled as follows to solve the above problem.

First, the slide rail 7 is attached to the work roll 1a.
In parallel, the positional relationship is set in advance so that the axis of the grindstone rotating shaft 22 of the grinding unit 5 is perpendicular to the axis Rc of the work roll 1a. First, when grinding the left half of the work roll 1a in FIG. 8, the slide rail 7 is tilted by θ degrees with respect to the work roll axis Rc using the slide rail moving device 30 in order to make the grinding surface one side on the left side. The position is fixed at S1 (step 100). θ degree is a minute angle of about 0.5 degree. Next, the grinding unit 5 is moved by the meshing of the traverse motor 58 and the rack 14, and when the information processing device 13c recognizes that the axis of the grindstone rotating shaft 21 has moved to the position of Ga based on the information of the encoder 58b, it is stopped (step 101), the rotary grindstone 20 is pressed against the rolling roll 1a, and grinding is started (step 102).

After the grinding is started, the grinding unit 5 is moved by the meshing of the traverse motor 58 and the rack 14 (step 103), and the grinding surface of the rotary grindstone 20 is moved to the central portion Rm of the work roll 1a according to the information of the encoder 58b. When the information processing device 13c recognizes it, the rotary grindstone is retracted from the position c1 to the position c2 (step 10).
4). Next, the sliding rail 7 is tilted to the opposite side using the sliding rail moving device 30 until the position S2 is tilted by −θ degrees with respect to the work roll axis Rc (step 105). By changing the inclination of the sliding rail 7, the grinding surface of the rotary grindstone is on the opposite side as before, and the new grind surface becomes the central portion Rm of the work roll 1a and returns the grindstone rotation axis to the position of Gb (step 106). ). The rotary grindstone 20 is fed in the roll radial direction from the position b2 by the grindstone feeder 22 and is pressed to a position where the necessary contact force is generated between the rotary grindstone 51 and the work roll 1a (step 107). From this state, the traverse device 24 moves to the position of the grindstone rotation axis Gd (step 108). The return operation is the reverse of what it is now.
Returns to the position of the axis of rotation Ga of the grindstone while grinding (steps 109 to 114).

With the above operation, the grinding unit 5 moves on the slide rail 7 during grinding (steps 103, 108, 1).
09, 114), since the distance between the work roll and the rotary grindstone 20 is constantly changing due to the inclination of the sliding rail 7, the contact force necessary for the rotary grindstone 51 and the work roll 1a is generated.
The grindstone rotating device 21 is moved back and forth by the grindstone feeding device 22. Further, by moving the sliding rail 7 back and forth by a small amount, grinding can be performed in the same manner as when the sliding rail 7 was parallel to the work roll 1a.

FIG. 10 shows another control method, in which one end of the slide rail 7 is rotatably attached and the other end can be moved back and forth by the slide rail moving device 30. When the grinding range of 20 is on the right side and on the left side, the inclination angle of the sliding rail 7 is θ with respect to the work roll axis Rc,
Move to −θ and perform grinding. Since the inclination angle of the sliding rail 7 is as small as 0.5 degree, the sliding rail 7
Of the distance between the work roll 1a and the work roll 1a
It is possible to move the rotary grindstone 20 to the work roll 1a while having a predetermined contact force.

Although the grinding of the work roll 1a has been described above, the reinforcement roll 1b can be ground by the same method as a matter of course.

In this embodiment, the worm screw 31 is used to move the sliding rail 7. However, instead of the worm screw 31, two large-stroke hydraulic cylinders and a small-stroke hydraulic cylinder are connected to each other. In the control of the present invention that uses a large stroke cylinder and tilts the slide rail 7, the same control as described above can be performed by using a small stroke cylinder.

The second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, in a cross rolling machine in which work rolls horizontally move in mutually opposite directions with respect to axes perpendicular to the rolling direction for rolling, grinding is performed following the cross angle. In the figure, the same members as those of the first embodiment are designated by the same reference numerals.

11 to 13, a rolling mill according to the present embodiment has a pair of rolling rolls (upper and lower work rolls) 1a, 1a for stretching a rolled material S and a pair of rolling rolls for supporting the rolling rolls 1a, 1a. (Upper and lower reinforcement rolls) 1b, 1b
And a roll bender 30, 30 for bending the rolling rolls 1a, 1a, and a cross device 40, 40 for horizontally crossing the rolling rolls 1a, 1a.

The on-line rolling roll grinding apparatus of this embodiment comprises two lower grinding units 5a for upper work rolls 1a,
5b (hereinafter represented by "5" in common description) and two upper grinding units 6a, 6b for upper work roll 1a (also represented by "6").

The upper grinding units 5a and 5b are respectively provided corresponding to the operation side end and the drive side end of the upper work roll 1a, and can grind independently of each other. The lower grinding units 6a and 6b are also provided corresponding to the operation side end and the drive side end of the lower work roll 1a, and can grind independently of each other. These grinding units 5a, 5b and 6
a and 6b have the same structure as the grinding unit 5 described in the first embodiment, and as shown in FIGS.
A disk-shaped rotary grindstone 20 for grinding the work roll 1a, a drive device 22 for rotating the rotary grindstone 20 by a grindstone rotation shaft 21, a feeding device 23 for pressing the rotary grindstone 20 against the work roll 1a, and a rotary grindstone 20 for the work roll 1a. A traverse device 24 that moves in the axial direction is provided.

In the rotary grindstone 20 of the grinding unit 5a and the rotary grindstone 20 of the grinding unit 5b, as shown in FIG. 14, the axis Gc1 of each grindstone rotary shaft 21 is perpendicular to the axis Rc of the work roll 1a. The abrasive grain layer 51 is arranged so as to be inclined at the minute angle α in directions opposite to each other with respect to the line Sc.
The contact line between the work roll 1a and the work roll 1a is formed only on each roll end side in the roll axial direction when viewed from the center of the grindstone. The same applies to the rotary grindstone 20 of the grinding unit 6a and the rotary grindstone 20 of the grinding unit 6b. This makes it possible to grind both ends of the work roll 1a without causing interference with the stand.

It is necessary that the roll grinding units 5 and 6 do not interfere with the bearing box 3 when the work rolls 1a and 1a are replaced. Therefore, both ends of the sliding rails 7 and 8 are slidably supported by the guides 9 attached to the stand 4,
The grinding units 5 and 6 are operation-side and drive-side slide rail moving devices 3 provided at both ends of the slide rails 7 and 8, respectively.
With 0, it is possible to move backward together with the sliding rails 7 and 8. Each sliding rail moving device 30 is composed of a worm screw 31, a motor 32 for driving the worm screw 31, and a motor encoder 33.
The tip of one screw shaft 31a is pin-connected to the slide rails 7 and 8.

The cross device 40, as shown in FIG.
A cross block 41 that abuts against the bearing box 3 and pushes the bearing box 3,
A piston 42 that moves the cross block 41 back and forth, a displacement meter 43 that measures the amount of movement of the piston 42, a piston 42
Hydraulic chamber 44a for pushing and hydraulic chamber 44b for returning piston 42
It is composed by.

The feed motor 57 of the feed device 22, the traverse motor 58 of the traverse device 24, and the motor 32 of the slide rail moving device 30 are controlled by the control devices 13a, 13b, 13d, respectively, as shown in FIG. In addition, the load cell 53 and the encoder 57 of the feeding device 23
The detection signals of a, the encoder 58b of the traverse device 24, the motor encoder 33 of the sliding rail moving device 30, and the displacement meter 43 of the cross device 40 are sent to the information processing device 13c and processed.

The slide rail moving device 30 constitutes an actuator means for moving the slide rails 7 and 8 in the radial direction of the rolling rolls 1a and 1a, and includes an information processing device 13c, control devices 13a, 13b and 13d, and an encoder 33. , 57
The a, 58b and the displacement gauge 43 constitute a control means for driving the actuator means so that the slide rails 7, 8 are parallel to the axis of the rolling rolls based on the information about the cross angle of the rolling rolls 1a, 1a. is doing. The actuator means and the control means are composed of the sliding rails 7 and 8
Constitutes a follow-up moving means for moving the sliding rail following the cross angle of the rolling rolls so that is parallel to the axis of the rolling rolls 1a.

Next, the operation of the online roll grinding apparatus of this embodiment will be described with reference to FIG. First, when a command to change the cross angle of the work roll is issued from a host controller (not shown) (step 200), hydraulic pressure is injected into the hydraulic chamber 44a of the cross device 40 in accordance with the instruction to cross block 4
1 to move the bearing box 3 (steps 201 to 20)
4). The work roll axis moves from Rc1 to Rc2, which is confirmed by the signal from the displacement meter 43 (step 20).
5). By the instruction to change the cross angle, the grinding unit 5 is retracted before the work roll axis is moved (step 20).
6). After moving the work roll axis, the sliding rail moving device 3
0 is instructed to move (step 207), the motor 32 is rotated (step 208), and the slide rails 7 and 8 are moved so as to be parallel to the work roll axis Rc2 (step 209). At this time, the displacement gauge 43 having the crossing device 40 in parallel with the sliding rails 7 and 8 and the work roll axis Rc2.
And the information measured by the motor encoder 33 of the sliding rail moving device 30 are confirmed by the information processing device 13c, and if they are parallel, the movement is stopped (step 210).

By moving the slide rails 7 and 8 so as to be parallel to the work roll axis, the grinding units 5 and 6 can be controlled for grinding in the same manner as in a rolling mill in which the grinding units 5 and 6 are not crossed.

Another embodiment of the follower moving means for moving the slide rail following the cross angle of the rolling roll in the cross rolling mill will be described with reference to FIG. In this embodiment, the sliding rail 7 is brought into contact with the cross block 41, and the sliding rail 7 is moved according to the change of the cross angle.

That is, in the same manner as described above, the cross device 40 is controlled and the cross block 41 is moved by the command of the host controller (not shown). Both ends of the slide rail 7 are brought into contact with the cross block 41 via the spherical support portions 46a and 46b, and further pressed by the cross following cylinder 45 so that the cross block 41 and the slide rail 7 move following each other. As a result, the cross block 41 can move and the slide rail 7 can always move in the horizontal direction.
If there is no gap between the spherical support portions 46a and 46b, the work roll axis Rc and the slide rail 7 are always parallel. The same applies to the sliding rail 8.

[0096]

According to the present invention, since the vibration of the rolling roll is absorbed by the elastic body function of the thin disk of the rotary grindstone,
Accurate grinding with good surface roughness can be performed without causing chattering and resonance. Also, 1 for one work roll
Since it is possible to grind from one end to the other end of the roll with one grinding unit, the on-line rolling roll grinding device can be installed in the rolling mill by effectively utilizing the capability of the grinding device and with a small space and a small equipment cost.

Furthermore, since the grinding unit can easily grind by following the cross angle simply by moving the sliding rails on the cross rolling machine, the cross rolling machine can pass the threaded portion and the unthreaded portion on the roll surface. Therefore, it becomes possible to perform grinding without generating a step, and it becomes possible to perform completely schedule-free rolling with a cross rolling mill.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional side view of a main part of a rolling mill including an online rolling roll grinding device according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional plan view of the rolling mill shown in FIG.

FIG. 3 is a cross-sectional view of a grinding unit.

FIG. 4 is a vertical sectional view of a grinding unit.

FIG. 5 is a view showing the arrangement and structure of a rotary grindstone and its vibration absorbing action.

FIG. 6 is a diagram illustrating a control system of an online rolling roll grinding device.

FIG. 7 is a diagram showing interference between the rotary grindstone and the stand when the rotary shaft of the rotary grindstone is tilted with respect to a line perpendicular to the roll shaft center for grinding.

FIG. 8 is an explanatory diagram of inclination of the sliding rail and movement and control of the grinding unit when moving both ends of the sliding rail.

9 is a flowchart showing a procedure of control shown in FIG.

FIG. 10 is an explanatory diagram of inclination of the sliding rail and movement and control of the grinding unit when one end of the sliding rail is rotatably supported and the other end is moved.

FIG. 11 is a partial cross-sectional side view of a main part of a rolling mill including an online rolling roll grinding device according to another embodiment of the present invention.

12 is a sectional view taken along line XII-XII in FIG.

13 is a sectional view taken along line XIII-XIII in FIG.

FIG. 14 is a diagram showing a positional relationship between rotary grindstones in two grinding units.

FIG. 15 is a diagram illustrating a control system of an online rolling roll grinding device.

FIG. 16 is a flowchart showing a procedure of control for grinding following a cross angle.

FIG. 17 is a schematic view of an embodiment in which a sliding rail is brought into contact with a cross block and follows a roll to control the inclination of the sliding rail.

[Explanation of symbols]

 1a: Rolling roll (upper and lower work rolls) 1b: Rolling roll (upper and lower reinforcement rolls) 4: Stand 5: Grinding unit 6: Grinding unit 7; 8: Sliding berth rail 13a; 13b; 13d: Control device 13c: Information processing Device 14: Rack 20: Rotating whetstone 21: Whetstone rotating shaft 22: Driving device 23: Feeding device 24: Traverse device 30: Sliding rail moving device 31: Worm screw 33: Encoder 40: Cross device 41: Cross block 42: Piston 43: Displacement meter 45: Cross following cylinder 51: Abrasive grain layer 52: Thin disk 53: Load cell 54: Liquid motor 57: Feed motor 57a: Encoder 58: Traverse motor 58b: Encoder

Claims (7)

[Claims] 1. A grinding unit, comprising: one grinding unit installed for one rolling roll in a rolling mill; and a slide rail for movably supporting the grinding unit in the axial direction of the rolling roll. The unit is a disk-shaped rotary grindstone for grinding the rolling roll, a driving device for rotating the rotary grindstone by a grindstone rotating shaft, a feeding device for pressing the rotary grindstone onto the rolling roll, and the grinding unit along the sliding rail. In an online rolling roll grinding device having a traverse device for moving, the rotating grindstone has a thin disk attached to the grindstone rotating shaft, and an abrasive grain layer fixed to one side surface of the thin disk, The thin disk has an elastic body function for absorbing vibrations from the rolling rolls; provided on at least one end of the sliding rail, The actuator means for inclining the moving rail with respect to the axis of the rolling roll, the grinding unit at a position for grinding one end side of the rolling roll, and at a position for grinding the other end side, The actuator means is driven so as to incline the slide rail in the opposite direction with respect to the axis of the rolling roll, and the rotary grindstone rolls against the change in the distance between the slide rail and the axis of the rolling roll. An online rolling roll grinding device further comprising: a control means for driving the grindstone feeding device and the traverse device so as to move in parallel to the axis of the. 2. The online rolling roll grinding device according to claim 1, wherein the abrasive grain layer contains cubic boron nitride abrasive grains or diamond abrasive grains. 3. At least two grinding units installed for one rolling roll in a cross rolling machine that horizontally crosses a pair of rolling rolls, and the grinding unit is moved in the axial direction of the rolling rolls. And a sliding rail that supports the grinding roll, the grinding unit includes a disk-shaped rotary grindstone for grinding the rolling roll, a drive device that rotates the rotary grindstone by a grindstone rotating shaft, and the rotary grindstone is pressed against the rolling roll. A feeder, an online rolling roll grinding apparatus having a traverse device for moving the grinding unit along the sliding rail, wherein the rotating grindstone is a thin disk attached to the grindstone rotating shaft, and one of the thin disk The thin plate has an elastic body function for absorbing vibration from the rolling roll. On-line, further comprising a follow-up moving means for moving the slide rail so as to follow the cross angle of the rolling roll so that the slide rail is parallel to the axis of the rolling roll. Rolling roll grinding machine. 4. The on-line rolling roll grinding apparatus according to claim 3, wherein the follow-up moving means includes actuator means for moving the sliding rail in a radial direction of the rolling roll and information about a cross angle of the rolling roll. And a control means for driving the actuator means so that the slide rail is parallel to the axis of the rolling roll. 5. The on-line rolling roll grinding device according to claim 3, wherein the rolling mill has operating-side and driving-side cross blocks that abut against bearing boxes supporting both ends of the rolling rolls and push the bearing boxes. The follow-up moving means has actuator means for bringing both ends of the sliding rail into contact with the operating-side and driving-side cross blocks to enable the sliding rail to move integrally with the cross block. Characteristic online rolling roll grinding machine. 6. The online rolling roll grinding machine according to claim 3, wherein the abrasive grain layer contains cubic boron nitride abrasive grains or diamond abrasive grains. 7. The online rolling roll grinding apparatus according to claim 3, wherein the rotary grindstone is arranged such that a contact line between the abrasive grain layer and the rolling roll is formed only on one side when viewed from the center of the grindstone. An online rolling roll grinding machine characterized by being used.