JP2708351B2 - Rolling mill, roll grinding device, and rolling method with online roll grinding device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill , a roll grinding apparatus and a rolling method provided with an online roll grinding apparatus, and more particularly to an effective online grinding of a roll without being affected by the vibration of the roll. Mill , roll grinding device and pressure with online roll grinding device capable of performing
Regarding the rolling method .

[0002]

2. Description of the Related Art Generally, when a slab material is rolled on a rolling roll of a plate rolling mill, only a rolled portion is worn and a step is generated from a non-rolled portion. For this reason, there were 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.

[0003] For example, Mitsubishi Tech 1988 Vol. 25,
No. 4 According to "Development of online roll grinder", a plurality of rotating grindstones are arranged on one rolling roll,
And the multiple rotating whetstones are installed in an integrated frame,
While the entire frame always moves within a certain range, the rotating grindstone is not actively driven by the motor, but is driven passively by using the rotating force of the rolling roll to grind the entire rolling roll (hereinafter referred to as a first grinding wheel). Conventional technology).

[0004] In the specification of Japanese Utility Model Application Laid-Open No. 58-28705, one rolling roll grinding unit is disposed on one rolling roll, and a rolling roll is provided on the opposite side of the roll grinding unit across the rolling roll. The contact sensor of the position sensor is brought into contact with the necks at both ends of the roll, and the position sensor detects the deviation of the axis of the rolling roll and controls the feed device so that the rotating grindstone follows the deviation. (Hereinafter, referred to as a second conventional technique).

[0005] Also, in the 1992 Precise Engineering Society Spring Conference Lecture Lecture Book, "On-machine constant-pressure grinding of rolling rolls", the abrasive layer of a cup-type rotary grindstone is formed by cubic boron nitride (CBN) grinding. There has been reported an experimental result in which a grinding wheel was formed by grinding the grinding wheel with the rotating shaft of the rotating grindstone arranged substantially perpendicular to the rolling roll (hereinafter, referred to as a third conventional technique).

Further, in the specification of Japanese Utility Model Application Laid-Open No. 58-28706 and Japanese Utility Model Application Laid-Open No. 62-95867, a cup-type rotary grindstone arranged substantially perpendicular to a rolling roll is disclosed.
A technology is described in which a grinding wheel is slidably mounted in the axial direction with respect to the rotating shaft, and the back surface of the rotating grinding wheel is supported in an axial direction by an elastic body directly or via a boss to absorb the roll vibration (hereinafter, referred to as a technology). , The fourth prior art).

[0007] On the other hand, in a sheet rolling mill, it has been thought that the profile of a rolling roll has been known and that it is desired to use the profile for controlling the crown and shape of a rolled steel sheet based on the profile. As a technique for measuring the profile of the rolling roll, an online profile meter using an ultrasonic displacement meter has recently been developed. The system configuration of this profile meter is described in Mitsubishi Tech 1992 Vol. 29, No. 1, "Development of an online roll grinding system with a profile meter". This creates a water column between the probe with a built-in ultrasonic displacement meter and the rolling roll, and calculates the interval between the roll from the time that the pulsed ultrasonic waves emitted from the probe reciprocate between the probe and the rolling roll surface. (Hereinafter referred to as a fifth conventional technique).

[0008]

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

In general, when machining a cylindrical workpiece, the workpiece to be ground is supported by a center that rotates with high precision, and the workpiece is ground while minimizing the vibration of the workpiece. However, when it is attempted to grind a rolling roll during rolling in a rolling mill, it is impossible to grind with very little vibration as in a normal workpiece. Rolling rolls during rolling usually have an amplitude of 20 μm to 60 μm, 1 G to 2 G
It rotates while vibrating with a moderate acceleration. In this state, the online roll grinding device must grind accurately.

In the first to third prior arts, when the vibrating rolling roll is ground as described above, unevenness due to the chatter phenomenon occurs on the rolling roll surface. Further, the grindstone is also significantly consumed by the impact force due to the chatter phenomenon, the life of the grindstone is shortened, and it is necessary to frequently replace the grindstone. Furthermore,
It is difficult to control the contact force when grinding the roll to a predetermined profile.

In the fourth prior art, the elastic body is intended to absorb the vibration of the rolling roll. However, in this conventional technique, since the entire 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 having a high grinding ratio are used as the abrasive grains of the grindstone, the mass of the movable part supported by the elastic body and moving back and forth is such that the grindstone diameter is 250 mm, the grindstone, the slide bearing, and the seal. Including parts, it is at least 5 kg or more. Also, the spring constant of the elastic body must be 130 kgf / mm if the allowable value of the change in contact force between the rolling roll and the grindstone is 4 kgf and the amplitude of the vibration 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 movable portion including the elastic body resonates due to the vibration of the rolling roll, causing chatter marks on the roll surface, and the grindstone is worn out quickly. If the diameter of the grindstone is reduced and the mass of the movable part is reduced, the grinding ability is greatly reduced.

The cup-type grindstone is slidable in the axial direction of the grindstone rotating shaft, and the back of the grindstone is supported by an elastic body. However, during roll grinding, cooling water and grinding debris are scattered around the grindstone, and these enter the gap between the grindstone and the grindstone rotating shaft from the seal part attached to the vibrating grindstone, and the grindstone moves smoothly. And it is difficult to stably perform the function of the elastic body for a long time.

Further, the first and second prior arts have the following problems. Since the non-rolled portion of the rolling roll is not worn by the rolled material, it is desirable to grind more than the rolled portion. However, in the first prior art, since the peripheral speed of the grinding wheel is limited by the rotation speed of the rolling roll, when grinding a large number of non-rolled portions, the only option is to control the amount of grinding by changing the contact force. For this reason, since the amount of grinding is limited, it is difficult to maintain a constant rolling roll profile for a long time.

Further, in the second prior art, since the grinding wheel rotation axis is arranged orthogonal to the rolling roll, the abrasive grain layer of the rotating grinding wheel is formed on the rolling roll at two positions on the left and right sides of the annular abrasive grain surface. They are in contact with each other and grinding is performed simultaneously at the two places.
For this reason, if the rolling roll is inclined, the two grinding surfaces interfere with each other to cause chattering, and since the two grinding wheels are in contact with each other, it is difficult to control the contact force between the rotary grindstone and the rolling roll. Furthermore, in a severe environment of a rolling mill, there is a problem of reliability of a position sensor, and it has not been put to practical use.

Next, the measurement of the roll profile will be described. When the rolling roll rolls the plate material, the portion where the plate is rolled wears by about 2 μm / radius with one coil in the case of a hot-rolled steel plate. The profile of the roll surface changes over the entire length of the roll body due to the thermal crown in which the roll diameter increases due to the wear amount and the heat of the rolled material. If the profile of the rolling roll can be measured correctly, it is possible to grind to a rolling roll profile optimum for rolling by an online roll grinder provided inside the rolling mill. Until now, it has been difficult to accurately measure the roll profile in a rolling mill, that is, on-line, which is constantly vibrating and is exposed to a large amount of roll cooling water.

In this online profile meter, as in the fifth prior art, a water column is generated between the probe and the rolling roll, and the distance between the roll and the roll is determined based on the time when ultrasonic waves reciprocate between the probe and the rolling roll surface. The one using the required ultrasonic displacement meter was developed. However, to measure the time that ultrasonic waves travel back and forth over very short intervals,
This time is very short, and since the profile difference is on the order of microns, a small measurement error in the time may cause a large profile error. In particular, when used for a long time, there is a change in the state of the water column between the probe and the roll, and it is difficult to detect even if there is a measurement error. In principle, the ultrasonic method can always measure accurately, but when used in a harsh environment for a long time as described above, it is difficult to always maintain the correct accuracy, and multiple measuring probes are required. Calibration is also difficult because there are individual pieces.

A first object of the present invention is to provide a rolling mill and a roll equipped with an on-line roll grinding device capable of absorbing a vibration from a rolling roll and performing grinding accurately and with good surface roughness of the rolling roll without generating chatter phenomenon. An object of the present invention is to provide a grinding device and a rolling method .

A second object of the present invention is to provide a rolling mill provided with an online roll grinding device capable of correctly measuring a profile of a rolling roll by a roll profile meter integrated with the online roll grinding device. It is in.

[0019]

The first and second objects are as described above.
In order to achieve the above, the present invention employs the following configuration.

That is, the present invention provides an on-line apparatus having a grindstone device arranged to face a rolling roll and grinding the rotating rolling roll, and a moving device for transferring the grindstone device along the axial direction of the rolling roll. In a rolling mill provided with a roll grinding device, the grinding wheel device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
A thin disk-shaped support member having a flexible elastic body functions sufficient, the abrasive grain layer formed on the surface of the thin disc-shaped support member, and a driving device for rotationally driving the thin disc-shaped support member It shall have a pressing device for pressing the thin disc-shaped support member to the rolling roll with abrasive layer.

[0021] The present invention also provides an on-line roll having a grindstone device installed on a stand of a rolling mill for grinding a rotating roll, and a moving device for transferring the grindstone device along the axial direction of the roll. In a rolling mill provided with a grinding device, the grinding device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
A thin disk-shaped support member having a flexible elastic body functions sufficient, the abrasive grain layer formed on the surface of the thin disc-shaped support member, and a driving device for rotationally driving the thin disc-shaped support member , and a pressing device for pressing the thin disc-shaped support member to the rolling roll with abrasive layer, the thin disc-shaped supporting
The holding member resonates while being pressed against the rolling roll.
Small enough to absorb the vibration of the rolling roll without
Shall have a mass .

Further, the present invention provides a method for disposing a roll facing a roll.
And a grinding wheel device that grinds the rotating rolling roll
A moving device that transfers the grinding wheel device along the axial direction of the rolling roll.
Rolling mill equipped with an online roll grinding device having
In the above, the grinding device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
Thin disk-shaped support member with sufficient elastic function
And abrasive grains formed on the surface of the thin disk-shaped support member
Layer and a driving device for rotationally driving the thin disk-shaped support member
And the rolling support is rolled together with the abrasive layer.
And a pressing device for pressing against the tool.
A state in which the thin disk-shaped support member is pressed against a rolling roll.
High enough to deflect only the thin disk-shaped support member
It is assumed that it has a constant.

Here, preferably, the thin disk-shaped support member having the abrasive layer formed thereon has a rotation axis which is inclined with respect to a direction perpendicular to the axis of the rolling roll when rotated by the driving device. It is arranged.

[0024] Preferably, the abrasive layer is cubic nitride.
Includes one of boron carbide abrasive grains and diamond abrasive grains.

Further, the present invention provides a grindstone device which is arranged facing a rolling roll provided in a rolling mill and grinds a rolling roll being rotated in a rolling operation, and a grindstone device which is arranged along the axial direction of the rolling roll. And an on-line roll grinding device having a moving device for transferring the grinding wheel .
Contact with the rolling roll while pressed against the
Thin circular plate with flexible elastic function enough to bend locally
Abrasive and disk-shaped support member, and the abrasive grain layer formed on the surface of the thin disc-shaped support member, and a driving device for rotationally driving the thin disc-shaped support member, the thin disc-shaped support member And a pressing device that presses the surface of the rolling roll together with the layer.

The present invention also provides an on-line roll having a grinder device installed on a stand of a rolling mill for grinding a rotating roll and a moving device for transferring the grind device along the axial direction of the roll. In a rolling mill provided with a grinding device, the grinding device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
A thin disk-shaped support member having a sufficient elastic elastic body function, and an abrasive layer of cubic boron nitride abrasive grains or diamond abrasive grains provided on the surface of the thin disk-shaped support member;
A driving device for a thin disc-shaped support member is rotationally driven, and a pressing device for pressing the thin disc-shaped support member which is rotated by the driving device in the rolling roll with abrasive layer possess,
The thin disk-shaped support member functions as the flexible elastic body.
As a buffer of 1000 kgf / mm to 30 kgf / mm.
Have constants .

Further, the present invention provides an on-line roll provided with a grindstone device installed on a stand of a rolling mill for grinding a rotating roll, and a moving device for transferring the grindstone device along the axial direction of the roll. In a rolling mill provided with a grinding device, the grinding device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
A thin disk-shaped support member having a sufficient elastic elastic body function, and an abrasive layer of cubic boron nitride abrasive grains or diamond abrasive grains provided on the surface of the thin disk-shaped support member;
A driving device for a thin disc-shaped support member is rotationally driven, and a pressing device for pressing the thin disc-shaped support member which is rotated by the driving device in the rolling roll with abrasive layer possess,
The thin disk-shaped support member functions as the flexible elastic body.
As a spring of 500 kgf / mm to 50 kgf / mm
It has a constant .

The present invention also provides an on-line apparatus having a grindstone device arranged to face a rolling roll and grinding a rotating rolling roll, and a moving device for transferring the grinding wheel device along the axial direction of the rolling roll. In a rolling mill provided with a roll grinding device, the grinding wheel device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
A thin disk-shaped support member having a flexible elastic body functions sufficient, the abrasive grain layer formed on the surface of the thin disc-shaped support member, and a driving device for rotationally driving the thin disc-shaped support member , and a pressing device for pressing the thin disc-shaped support member to the rolling roll with abrasive layer, the online roll grinding device includes a load detecting means for detecting the contact force between the mill roll and the grinding wheel layer, the The pressing device is controlled so that the contact force detected by the load detecting means has a desired value, and the grinding amount of the rolling roll by the abrasive layer is adjusted, whereby the rolling roll is ground to a predetermined roll profile. Control means for performing the control.

Further, the present invention provides an on-line apparatus having a grindstone device arranged to face a rolling roll and grinding the rotating rolling roll, and a moving device for transferring the grindstone device along the axial direction of the rolling roll. In a rolling mill provided with a roll grinding device, the grinding wheel device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
A thin disk-shaped support member having a flexible elastic body functions sufficient, the abrasive grain layer formed on the surface of the thin disc-shaped support member, and a driving device for rotationally driving the thin disc-shaped support member , and a pressing device for pressing the rolling roll with the thin disc-shaped support member and the abrasive layer, the online roll grinding apparatus, the driving device when rotating by driving the thin disc-shaped support member Load detecting means for detecting a load, the pressing device is controlled so that the load detected by the load detecting means has a desired value, and the amount of grinding of the rolling roll by the abrasive layer is adjusted. Control means for grinding the roll into a predetermined roll profile.

Here, preferably, the pressing device converts the rotation of the rotary driving source and the rotation of the rotary driving source into movement in the direction of the rotation axis, and moves the thin disk-shaped support member forward and backward with respect to the rolling roll. It has a ball screw mechanism or a gear mechanism with small backlash.

Preferably, two roll grinding units each having the thin disk-shaped support member and the abrasive layer, a driving device, a pressing device, and a moving device are arranged for one rolling roll. The thin disk-shaped support member of each of the grinding units is such that a contact line between the abrasive layer and the rolling roll is formed closer to the roll end than the center of rotation of the support member in the roll axis direction. The axis of rotation when rotated by the driving device is arranged obliquely so as to be opposite to the direction orthogonal to the axis of the rolling roll.

The present invention also provides a grindstone device arranged to face a pair of rolling rolls for grinding a rotating rolling roll, and a moving device for transferring the grindstone device along the axial direction of the rolling roll. In a rolling mill provided with an online roll grinding device, the grinding device is a thin plate having a function of a flexible elastic body enough to locally bend a contact portion with the rolling roll in a state pressed against the rolling roll. A disk-shaped support member, an abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and an abrasive grain. A pressing device for pressing the roll with the layer, the online roll grinding device includes a roll profile meter that detects the profile of the rolling roll online,
The roll profile meter supports the thin disk-shaped support.
Contact between the abrasive layer formed on the surface of the holding member and the rolling roll
Load detecting means for detecting a force;
Movement that detects the amount of movement of the moving device that moves in the axial direction of the
Contact detected by the amount detecting means and the load detecting means
Calculate the amount of deflection of the thin disk-shaped support member based on the force
In addition, the calculation of the amount of bending is performed by the movement amount detecting means.
Axial direction of the roll based on the amount of movement detected by
At multiple points along the
Calculation device for calculating the roll profile of the rolling roll
It shall be equipped with a door. Further, the present invention relates to a pair of rolling rolls.
Grinding rolling rolls placed facing
A grindstone device and this grindstone device along the axial direction of the rolling roll
-Line grinding machine having a moving device for transferring by air
In a rolling mill provided with a mill,
The part in contact with the rolling roll while pressed against the roll
Having a flexible elastic function enough to bend locally
A disk-shaped support member and the surface of the thin disk-shaped support member
Rotating the abrasive layer formed on the substrate and the thin disk-shaped support member
A driving device for driving, and the thin disk-shaped support member
And a pressing device for pressing the roll together with the layer.
The online roll grinding device is used to
Profile meter to detect rules online
Wherein the roll profile meter comprises:
Abrasive layer and rolling roll formed on the surface of a disk-shaped support member
Load detecting means for detecting the contact force between the thin plate and the disk
Position detection to detect the position of the supporting member with respect to the rolling roll
Transfer means and the grinding device in the axial direction of the rolling roll.
Moving amount detecting means for detecting the moving amount of the moving device;
So that the contact force detected by the load detection means becomes constant
While controlling the pressing device, the position detecting means
Position is detected by the movement amount detecting means.
Multiple locations along the axis of the roll based on the amount of movement
And rolling of the rolling roll based on these positions.
And a calculation device for calculating the profile.
You.

Further, the present invention is directed to a pair of rolling rolls.
Wheel device that grinds a rolling roll that is placed and rotated
And transfer the grinding device along the axial direction of the rolling roll.
An online roll grinding device having a moving device
In the rolling mill, the grinding device is mounted on the rolling roll.
The area of contact with the rolling rolls when pressed is localized
Thin disk-shaped plate with flexible elastic function enough to bend to
A support member and a thin disk-shaped support member are formed on the surface of the support member.
The abrasive layer and the thin disk-shaped support member are rotationally driven.
Drive device and the thin disk-shaped support member together with the abrasive layer.
And a pressing device for pressing against a rolling roll.
The in-roll grinding device turns the roll profile
Equipped with a roll profile meter that detects on-line,
Furthermore, the rolling roll detected by this roll profile meter
Roll profile and preset roll roll target roll
The deviation from the rule profile, and based on this deviation
By controlling at least one of the pressing device and the moving device
Adjust the amount of grinding of the rolling roll by the abrasive layer,
More rolls match the target roll profile
Control means for grinding such that

Further , the present invention is directed to a pair of rolling rolls.
Wheel device that grinds a rolling roll that is placed and rotated
And transfer the grinding device along the axial direction of the rolling roll.
An online roll grinding device having a moving device
In the rolling mill, the grinding device is mounted on the rolling roll.
The area of contact with the rolling rolls when pressed is localized
Thin disk-shaped plate with flexible elastic function enough to bend to
A support member and a thin disk-shaped support member are formed on the surface of the support member.
The abrasive layer and the thin disk-shaped support member are rotationally driven.
Drive device and the thin disk-shaped support member together with the abrasive layer.
And a pressing device for pressing against a rolling roll.
The in-roll grinding device turns the roll profile
Equipped with a roll profile meter that detects on-line,
In addition, roll benders that provide bender power to rolling rolls
-Means, roll shift to shift the rolling roll in the axial direction
And the pair of rolling rolls cross each other.
At least one of the roll cloth means and the roll pro
Roll roll profile detected by feeler meter
The rolled material is close to the target plate crown based on the
Roll bender means bender power, roll shift hand
Shift position by step and click by the roll cross means
Control means for controlling at least one of the loss angles.
Shall be.

The present invention also relates to a rolling mill provided with the above-mentioned on-line roll grinding device, wherein the roll profile meter is provided with a contact force between an abrasive layer formed on the surface of the thin disk-shaped support member and a rolling roll. Load detecting means for detecting the distance, the moving amount detecting means for detecting the moving amount of the moving device for moving the grinding wheel device in the axial direction of the rolling roll, and the thin disk based on the contact force detected by the load detecting means The amount of deflection of the support member is calculated , and this deflection is calculated.
Line computation amount, at a plurality of locations along the axial direction of the rolling roll based on the moving amount detected by said moving amount detecting means
And a calculation device for calculating the roll profile of the rolling roll based on the amount of deflection.

Further, the present invention relates to a rolling mill provided with the above-mentioned on-line roll grinding device, wherein the roll profile meter is provided with a contact force between an abrasive layer formed on a surface of the thin disk-shaped support member and a rolling roll. Load detecting means, a position detecting means for detecting a position of the thin disk-shaped support member with respect to the rolling roll, and a moving amount for detecting a moving amount of a moving device for moving the grinding wheel device in the axial direction of the rolling roll. Detecting means for controlling the pressing device so that the contact force detected by the load detecting means is constant, and detecting the position by the position detecting means based on the movement amount detected by the movement amount detecting means. performed at a plurality of locations along the axial direction of the rolling rolls Te, also comprises a computing device for calculating the roll profile of the mill roll on the basis of these positions To.

According to the present invention, there is provided an on-line apparatus having a grindstone device arranged to face a rolling roll and grinding the rotating roll, and a moving device for transferring the grinding wheel device along the axial direction of the rolling roll. In a rolling mill provided with a roll grinding device, the grinding device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
Thin disk-shaped support member with sufficient elastic function
And abrasive grains formed on the surface of the thin disk-shaped support member
Layer and a driving device for rotationally driving the thin disk-shaped support member
And a pressing device that presses the thin disk-shaped support member against the rolling roll together with the abrasive layer , the online roll grinding device includes a roll tilt detecting device that detects a tilt of the axis of the rolling roll, Based on the value of the detected inclination of the axis of the rolling roll, a target roll profile for the inclination of the axis of the rolling roll is calculated, and the pressing device and the pressing device so that the abrasive layer moves on the target roll profile. And control means for controlling each of the moving devices, thereby grinding the rolling roll having the inclined axis to a desired roll profile.

Further, the present invention provides an on-line apparatus having a grindstone device arranged to face a rolling roll and grinding the rotating rolling roll, and a moving device for transferring the grinding wheel device along the axial direction of the rolling roll. In a rolling mill provided with a roll grinding device, the grinding wheel device is pressed against the rolling roll.
The contact part with the rolling roll is locally bent in the
Thin disk-shaped support member with sufficient elastic function
And abrasive grains formed on the surface of the thin disk-shaped support member
Layer and a driving device for rotationally driving the thin disk-shaped support member
And a pressing device for pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll, wherein the on-line roll grinding device is provided at at least one end of the rolling roll. A reference small diameter portion with a smaller roll diameter and a smaller diameter than the part ,
Distance detecting means for detecting a distance, and rolling the abrasive layer by the pressing device so that the contact force between the abrasive layer and the rolling roll at each position of the reference small diameter portion and the grinding portion of the rolling roll is the same. Pressing on the roll and detecting the distance at that time
Roll diameter calculating means for determining the step between the reference small diameter portion and the grinding portion from the difference in the distance detected by the means, and calculating the roll diameter of the grinding portion from this step and the known roll diameter of the reference small diameter portion; Shall be provided.

The present invention also relates to a rolling method for a rolling mill provided with an online roll grinding device having a grinding device for grinding a rolling roll and a moving device for transferring the grinding device along the axial direction of the rolling roll. In the state where an abrasive layer is formed on the surface and pressed against the rolling roll,
A thin disk-shaped support member having a flexible elastic body function sufficient to locally bend the contact portion with the tool is provided in the grinding wheel device.
The thin disk-shaped support member is rotated and driven, and the rotating thin disk-shaped support member is pressed against the rolling roll, and the thin disk pressed against the rolling roll is pressed.
By transferring the support member in the shape of a roll along the axial direction of the roll, the surface shape of the rolling roll rotating while vibrating is ground to a desired contour shape, and rolling is performed by the ground roll. Shall be.

Further, the present invention provides an on-line apparatus having a grindstone device arranged to face a rolling roll and grinding the rotating rolling roll, and a moving device for transferring the grindstone device along the axial direction of the rolling roll. In a rolling mill provided with a roll grinding device, the grinding wheel device has a thin disk-like shape having a flexible elastic body function sufficient to locally bend a contact portion with the rolling roll while being pressed against the rolling roll. Support member, an abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and the thin disk-shaped support member together with the abrasive layer A pressing device for pressing the rolling roll, wherein the online roll grinding device further includes a roll profile meter for detecting the profile of the rolling roll online. Meter, the thin disc-shaped support portion
The contact force between the abrasive layer formed on the surface of
Load detecting means for detecting, and the grinding device
Movement amount detection to detect the movement amount of the moving device that moves in the axial direction
Output means and the contact force detected by the load detection means.
The amount of deflection of the thin disk-shaped support member is calculated based on the
At the same time, the calculation of the bending amount is performed by the movement amount detecting means.
Along the axis of the rolling roll based on the detected
At a plurality of locations, and based on the amount of deflection,
Profile to calculate roll profile of roll roll
Calculating means for calculating a deviation between the profile of the rolling roll measured by the off-line profile meter and the profile of the same rolling roll obtained by the profile calculating means, and calculating the rolling roll in the moving direction of the rotary grindstone by the moving device from the deviation. And a means for correcting the roll profile obtained by the profile calculating means based on the parallelism error. Further, the present invention is arranged such that the roll is arranged facing the rolling roll,
Whetstone device for grinding rolling rolls during rolling, and this whetstone device
And a moving device for transferring the rolls along the axial direction of the rolling rolls.
Rolling mill with online roll grinding equipment
The grinding wheel device was pressed against the rolling roll.
In the state, the contact part with the roll may be sufficient to bend locally.
A thin disk-shaped support member having a flexible elastic body function;
Abrasive layer formed on the surface of the thin disk-shaped support member,
A driving device for rotationally driving the thin disk-shaped support member,
The thin disk-shaped support member is formed into a rolling roll together with the abrasive layer.
A pressing device for pressing, said online roll grinding
The device detects the rolling roll profile online
A roll profile meter,
The profile meter is a table of the thin disk-shaped support member.
Detects the contact force between the abrasive layer formed on the surface and the rolling roll
Load detecting means, and a rolling roller for the thin disk-shaped support member.
Position detecting means for detecting a position with respect to the tool,
The amount of movement of the moving device that transfers the device in the axial direction of the rolling roll
Moving amount detecting means for detecting the load, and the load detecting means
Controlling the pressing device so that the detected contact force is constant
And detecting the position by the position detecting means
Pressure based on the movement amount detected by the movement amount detection means.
Perform at multiple locations along the axial direction of the roll
The roll profile of the rolling roll based on the
Profile calculation means and offline profile
Roll profile measured with a
The profile of the same rolling roll determined by
Calculated from the deviation, and from the deviation,
Parallelism of the moving direction of the rotating grindstone with the rolling roll
Error, and based on the parallelism error, the profile
Means for correcting the roll profile obtained by the calculating means;
Shall be provided.

[0041]

According to the present invention having the above-described structure, a thin disk-shaped support member having a flexible elastic body function is rolled by a pressing device together with an abrasive layer formed on the surface thereof. , And the rolling roll is ground by being rotationally driven by a driving device. When grinding such a rolling roll, the support member supporting the abrasive layer is formed into a thin disk shape.
Rolling roll while pressed against the holding member
By providing a flexible elastic body function sufficient to locally bend the contact portion with the roller, the supporting member bends when pressed by the vibration of the rolling roll, and instantaneously absorbs the vibration from the rolling roll. Thus, the variation in the contact force between the abrasive layer and the rolling rolls is within a small range of the elastic force generated by the bending of the support member, and the chatter phenomenon can be eliminated. In addition, the support member is made into a thin disk shape, and the support member itself has an elastic body function, and is integrated with the abrasive layer (hereinafter, the integrated member is appropriately referred to as a “grindstone” or a “rotary grindstone”). For this reason, the mass that can be moved by the vibration from the rolling rolls is only the abrasive layer and the support member, and the support member has a thin disk shape.
The movable part mass becomes very small because, the natural frequency of the movable portion is increased. For this reason, the vibrating rolling roll can be correctly ground for a long time without causing chattering due to resonance. Furthermore, the thin disk-shaped support member is
When pressing against the rolling roll, the spring constant of the pressing device
If low, include part of the pressing device due to the rolling roll vibration
Since the whole grindstone moves back and forth, the mass of the movable part increases at a stretch,
The natural frequency of the movable part decreases and resonance easily occurs,
It causes the chatter phenomenon. In the present invention, as described above,
The support member itself has a thin disk shape,
In addition to having a physical function, the pressing device is a thin disk
High spring constant enough to deflect only support members
Thin disk due to the vibration of the rolling roll
Only the supporting members of the
Therefore, the chatter phenomenon due to resonance can be reliably prevented.

A support having an elastic body function to support the abrasive layer
Set the rotation axis of the material to the direction perpendicular to the axis of the rolling roll.
The support member is bent in the form of a cantilever by the pressing force against the roll, and the elastic body function of the support member is effectively exerted, and the vibration from the roll can be easily absorbed. Become In addition, since the contact line with the rolling roll is formed at one location on one side of the center of the grindstone, chattering is prevented and contact force control (described later) can be appropriately performed.

By forming the abrasive layer with superabrasive grains, in particular, crystalline boron nitride abrasive grains or diamond abrasive grains, the abrasive layer is at least 100 times that of a grindstone using aluminum oxide (Al 2 O 3) or silicon carbide (SiC) based abrasive grains. Grinding ratio is obtained, and long-time grinding can be performed with a small weight. For this reason, the mass of the movable part is further reduced, which is effective in preventing resonance during grinding, and the frequency of replacement of the grindstone is reduced, thereby improving the productivity of the rolling mill.

With respect to the spring constant of the supporting member having the elastic function , if the spring constant is large, chatter marks are formed and the grinding ratio is deteriorated, and the abrasive layer is worn away and worn out at an early stage.
In addition, if the spring constant of the support member is large, the contact force between the abrasive layer and the rolling rolls fluctuates greatly, making it difficult to control the amount of grinding with the contact force. According to the study by the present inventors,
It was found that when the spring constant of the support member was set to 1000 kgf / mm or less, preferably 500 kgf / mm or less, the abrasive layer was prevented from being abraded early, and one grinding wheel exchange could continuously grind for 5 days or more.

On the other hand, when the spring constant is reduced, the fluctuation of the contact force is reduced by the vibration of the rolling roll, so that the grinding ratio is increased, but the detection sensitivity of the contact force is reduced, and the grinding control using the contact force and the roll profile measurement are performed. The accuracy of is reduced.
In addition, the fact that the spring constant of the support member is small means that the support member becomes thin, and the amount of bending under the same contact force increases, and a crack occurs in the support member due to the contact force required for grinding. According to the study by the present inventors, if the spring constant of the support member is set to 30 kgf / mm or more, it is possible to prevent cracks from being generated in the support member , and to set the spring constant to 50 kgf / mm.
Thus, it was found that a load variation caused by a step of 10 μm could be detected.

Regarding the composition of the abrasive layer, in order to stabilize the grinding ability without dressing by online grinding and to stabilize the grinding roughness, it is necessary for the superabrasive grains to spontaneously sharpen at a constant speed. In order for the superabrasive grains to properly sprout by themselves, it is necessary to adjust the load applied to one superabrasive grain. According to the study of the present inventors, if the density of superabrasive grains contained in the abrasive layer, that is, the concentration degree is set to 50 to 100, and a resin bond is used as a binder, the superabrasive grains can be easily self-generated. In addition, it was found that the life of the abrasive layer was not shortened and continuous grinding could be performed without dressing. Further, in order to make the surface roughness of the rolling rolls 0.3 to 1.5 μm in average roughness, the size of superabrasive grains, that is, the grain size is 80 to 180 μm.
I also knew it needed to be.

[0047] The contact force between the mill roll and the abrasive grain layer consistently measure further grinding amount per the rolling roll unit time varying this contact force is changed. This contact force is always measured, and the contact force is set to a desired value, for example, a certain value.
By using a pressing device , the same size can be ground over the entire cylindrical portion of the rolling roll.
That is, the original profile can be maintained and the entire length can be ground.

By controlling so as to increase or decrease the contact force, the rolling roll can be ground into an arbitrary roll profile. By controlling this contact force to be constant and arbitrarily controlling the moving speed of the rotating grindstone in the axial direction, the rolling roll can be ground into an arbitrary roll profile.

[0049] In addition, the rolling roll and without measuring the contact force between the abrasive layer, measuring the load of a driving device for rotating the abrasive layer and the support member, this load desired value, for example, a constant value
By controlling the pressing device so as to satisfy the following, it is possible to grind the same size over the entire length of the rolling roll. Further, by increasing or decreasing the load, the rolling roll can be ground into an arbitrary profile.

The pressing device for pressing the abrasive grain layer and the support member against the rolling rolls may cause chattering unless a mechanism having a high spring constant is used. As a compact pressing device having a high spring constant, a mechanism that drives a backlashless type preload ball screw with an electric motor is optimal. In addition, this mechanism is capable of holding the position of the rotating grindstone during grinding and feeding it slightly back and forth.

When the rotating grindstone is moved in the direction of the rolling roll axis for grinding, it is necessary to grind the non-rolled portion more than the rolled portion in order to eliminate the step between the non-rolled portion and the rolled portion. is there. The non-rolled portions are at both ends of the roll. Therefore, each grinding roll
The granular layer and the supporting member, the driving device, the pressing device, and the moving device
Two roll grinding units are provided so that these units can be moved independently. Usually, the two units are moved to non-rolled portions at both ends to perform grinding. Once every several times, the roll grinding unit is moved to the rolling section of the rolling roll to grind the surface fatigue layer. By grinding the non-rolled portion with the rotating grindstone as much as the rolled portion is worn by the rolled material, a roll roll profile having no step can be maintained.

When two roll grinding units are arranged, and the rolling rolls are ground so that they can be moved independently, a lap portion for grinding a grinding wheel is formed on the rolling rolls. The stop positions of the moving device are made different so that the wraps are not always at the same position, and the wrap positions are dispersed.

[0053] Further, as described above, when grinding the abrasive layer and the contact line of the rolling roll as a one place enables satisfactory grinding under certain conditions, the support member in the present invention in order that
Tilting a small angle rotation axis relative to the perpendicular line of the rolling roll axis of. In this case, on-line roll grinding apparatus having two grinding units, if the direction of inclination of the rotation axis of the support member at both ends of the rolling rolls are the same, the support member end and the housing may occur interference. Abrasive layer and rolling row
The contact line with the roll is in the roll axis direction from the center of rotation of the support member.
To form on the roll end,
Rotate the axis of rotation in the direction perpendicular to the axis of the roll.
By arranging them so as to be opposite to each other, such interference is prevented, the support member can be freely moved to the end of the rolling roll, and the dimension between the end of the rolling roll and the housing is reduced. No special consideration is required.

Rolling Roll into Target Roll Profile
In the control means for grinding to match, the roll pro
Roller profile is required by the feeler meter
Then , the profile of the obtained rolling roll and the preset
The deviation of the target roll profile
With a large force in the direction of the roll diameter
Control the pressing device to adjust the roll roll grinding amount,
As a result, the mill roll is ground to the target roll profile.
Shave. Instead, reduce the contact force between the rolling roll and the abrasive layer.
Control speed, and the moving speed of the rotating grindstone in the roll axis direction.
By controlling the moving device to change the degree
The rolling roll can also be changed,
Ground.

In the roll profile meter of the present invention
Te, after flexed a certain amount of support member pressed by the pressing device grinding wheel in the rolling roll rotating, the pressing device is fixed, measuring the contact force between the mill roll and the abrasive grain layer at that time by the load detecting means I do. Subsequently, the rotating grindstone is moved in the axial direction of the rolling roll by the moving device , and the amount of movement is measured by the moving amount detecting means, and the contact force is measured by the load detecting means.

Here, the abrasive layer of the rotary grinding wheel has an elastic body function.
Is supported by a support member having a spring constant of the support member is constant, the contact force increases and the amount of deflection of the support member is increased. Conversely, when the amount of deflection decreases, the contact force decreases. On the other hand, if the axis of the rolling roll and the online roll grinding device are installed in parallel, when the pressing device is fixed
The support member of (1) is largely bent when the diameter of the rolling roll is large, and is slightly bent when the diameter of the rolling roll is small.

Therefore, the load is detected by the load detecting means.
The bending amount of the support member is obtained from the contact force thus obtained, and the bending amount is arranged in association with each position in the roll axis direction, whereby the profile of the rolling roll is obtained.

Also, another roll profile of the present invention is provided.
In over data, pressing the grinding wheel in the rolling roll rotating
After pressing with a device and bending the support member by a certain amount, load
Detects contact force between rolling roll and abrasive layer by weight detection means
And based on this contact force, supported by the position detecting means.
The position of the member relative to the rolling roll is detected. Then, move
The rotating wheel is moved in the axial direction of the rolling roll by the
The movement amount is measured by the movement amount detection means. With a computing device
Is to determine the profile of the rolling roll by associating the position of the support member with each position in the roll axis direction.

The roll profile of the rolling roll is detected,
Or, when calculated, the data is input to a system computer that controls the entire rolling mill, and a bending force is applied to the rolling rolls by a roll bender provided in the rolling mill based on the data, and the hot rolled steel sheet is Improve your profile. When the rolling mill has roll shift means for shifting the rolling rolls in the axial direction or roll cross means for crossing the rolling rolls, these means may be controlled to improve the profile of the hot-rolled steel sheet. By using thus measured roll profile was the control Deda the roll bender and the roll shifting means or roll crossing means, that Do enables high strip crown control precision.

[0060] detecting the inclination of the rolling roll axis, vital calculates a target roll profile in consideration of the inclination of the axis
By grinding while controlling the whetstone to move,
Be tilted is rolled roll axis, Ru can always maintain the correct roll profile in consideration also its inclination.

[0061] possibly difference clogging diameter difference between the upper and lower roll diameter grinding rolling roll advances occurs there. When the diameter difference increases, the required rolling torque of the upper and lower rolls deviates, and excessive force acts on the spindle and the like, causing an accident.
In order to prevent this, the diameter difference is generally controlled to be within 0.2 mm / diameter.

[0062] roll diameter in at least one end of the rolling rolls Ri create a known reference small-diameter portion, by measuring the level difference between the grinding portions of the rolling rolls and standards small-diameter portion, to seek always right roll diameter Can be. This measurement can be performed with upper and lower rolls, and the diameter difference can be managed online.

By measuring the roll diameter at both ends of the roll, it is also possible to confirm whether the roll is not tapered in the roll axis direction (cylindricity).

The rotating grindstone is pressed against the rolling roll so that the contact force between the rotating grindstone and the rolling roll becomes equal at each position of the reference small diameter portion and the grinding portion of the rolling roll. By calculating the step between the small diameter portion and the grinding portion, the roll diameter can be measured without using a displacement meter.

The on- line roll grinding device is in the roll axis direction.
Installed so that the moving direction of the roll is parallel to the axis of the rolling roll
Have been. However, in the hot rolling mill, the heat of the rolled material is long.
There is a possibility that the parallelism will change during
The roll profile measured as described above is the true profile
It can no longer be called a wheel. Online profile mail
The correction means provided in the data corrector corrects this parallelism error.
Enables more accurate profile calculation.

That is, the rolling roll is installed in the roll shop.
Grinding with an off-line roll grinder
When finished, use the offline profile meter to
Measure the feel. Next, this rolling roll is
After being integrated into the online profile meter profile
The rolling roll profile is calculated by the
Next, an offline profile meter and an online professional
Calculate the deviation of the measured value with the field meter, and from this deviation
On-line roll grinding machine
Find the parallelism error. Then the online role profile
Rolling roll by means of profile calculation of wheel meter
When calculating the profile of
This parallelism error is calculated from the calculated value of the roll profile
Correct the calculated value by subtraction to find the correct value.
Confuse. This allows a more accurate profile of the rolling roll
Is found.

[0067]

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

First Embodiment First, a first embodiment of the present invention will be described with reference to FIGS.

In FIGS. 1 and 2, a rolling mill according to the present embodiment includes 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 four-high rolling mill having roll benders 30, 30 for bending the rolling rolls 1a, 1a. Roll 1
a, 1a are held by bearing housings 3, 3, and these bearing housings 3, 3 are incorporated in a stand 4 on the operation side and the drive side. An entrance guide 10 is arranged on the entry side of the rolling mill, and guides the rolled material S to the rolling roll 1a. Coolant headers 15, 15 are provided for cooling the heat of the rolling rolls 1a, 1a generated during rolling.
a, 1a is cooled.

The above-described rolling mill is provided with the online roll grinding device of the present embodiment. The online roll grinding device includes two upper roll grinding units 5a and 5b for the upper work roll 1a (hereinafter, represented by "5" in the common description) and two lower roll grinding units 6a and 5b for the lower work roll 1a. 6b (similarly, only one is represented by “6”).

The upper roll grinding units 5a and 5b are provided corresponding to the operation side end and the drive side end of the upper work roll 1a, respectively, and are capable of grinding independently of each other. The lower roll 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 be ground independently of each other. These units 5a, 5b
And 6a, 6b, as shown in FIGS. 3 and 4, respectively.
A disk-shaped rotary grindstone 20 for grinding the work roll 1a, a driving device 22 for rotating the rotary grindstone 20 by a grindstone rotating shaft 21, and a pressing for pressing the rotary grindstone 20 against the work roll 1a.
A feed device 23 as a pressure device and a traverse device 24 as a moving device for moving the rotary grindstone 20 in the axial direction of the work roll 1a are provided. Rotating wheel 20 and drive unit 22
And the rolling roll rotating by the feeding device (pressing device) 23
A grindstone device for grinding is configured .

The rotary grindstone 20 is shown in an enlarged manner in FIG.
And a thin disk 52 having a boss 52a.
And an annular abrasive layer 51 fixed to the side surface on the side opposite to the boss side.
Then, the thin disk 54 is mounted on the grinding wheel rotating shaft 21 at the boss 52a.
Mounted on The thin disk 52 is a work roll.
To have a flexible, resilient material functions to absorb vibration from
Constitute a supporting member that, the work roll 1a and the abrasive layer 5
It has a structure in which the amount of deflection varies depending on the contact force between the two.
The thin disk 52 is preferably 100
It has a spring constant of 0 kgf / mm to 30 kgf / mm, more preferably a spring constant of 500 kgf / mm to 50 kgf / mm. The abrasive layer 51 is formed integrally with the thin disk 52 by an adhesive so that it can be stably adhered to the vibrating work roll 1a.

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

As shown in FIG. 5, the grindstone 20 is arranged so that the axis Gc1 of the grindstone rotating shaft 21 is inclined at 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 rotating grindstones 20, the thin disk 52 can effectively exert the elastic body function, and the contact force between the rotating grindstone and the work roll can be appropriately controlled (described later).

Also, the rotary grindstone 20 of the roll grinding unit 5a and the rotary grindstone 20 of the roll grinding unit 5b are shown in FIG.
As shown in the figure, the axis Gc1 of each grindstone rotating shaft 21
Are arranged so as to be inclined at the small angle α in directions opposite to each other with respect to a line Sc perpendicular to the axis Rc of the work roll 1a,
The contact line between the abrasive layer 51 and the work roll 1a is formed only on each roll end in the roll axis direction when viewed from the center of the grindstone. The same applies to the rotary grindstone 20 of the roll grinding unit 6a and the rotary grindstone 20 of the roll grinding unit 6b. As a result, it is possible to grind both ends of the work roll 1a without causing interference with the stand (described later).

As shown in FIG. 3, the driving device 22 includes a liquid motor 54 (which may be an electric motor) for rotating the grindstone 20 to a predetermined grindstone peripheral speed, and a liquid motor 54.
And a belt 55 for transmitting the rotation of the output shaft 54a to the grindstone rotation shaft 21. The output shaft 54a and the pulley shaft 54b are connected via a parallel spline 54c. The pulley shaft 54b has a body 59
It is supported rotatably. The grindstone rotating shaft 21 is connected to the body 59 via slide type radial bearings 21a and 21b.
It is supported rotatably and movably in the axial direction. 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 rotary grindstone of the grindstone rotating shaft 21.

The body 59 is housed in the case 25, and the hydraulic motor 54 is mounted on the case 25. The body 59 is, as shown in FIG.
5 is mounted movably in the axial direction of the grindstone rotating shaft 21 via a slide bearing 25a.

As shown in FIG. 3, the feed device 23 moves the body 59 in the direction of contact and separation of the work roll 1a by rotation of the feed motor 57 attached to the case 25 and the rotation of the feed motor 57. It has a backlashless type preload ball screw 56 for feeding the grinding wheel rotating shaft 21 and the load cell 53 back and forth together, and an encoder 57a for detecting the rotation angle of the feed motor 57. A backlashless type gear mechanism may be used instead of the preload ball screw 56.

The traverse device 24 includes a traverse motor 58 attached to the case 25, as shown in FIG.
A pinion 58a mounted on the rotating shaft of the traverse motor 58 and meshing with the rack 14, and two pairs of guide rollers 26 mounted on the upper surface of the case 25 and engaged with the upper sliding rail 7 or the lower sliding rail 8. , Traverse motor 5
And an encoder 58b for detecting the number of revolutions. The sliding rails 7, 8 are, as shown in FIGS.
The work rolls 1a, 1a are inserted in parallel with the axis of the work roll 1a, and the rack 14 is formed on the side of the slide rail 7 or 8 opposite to the work roll. As described above, the roll grinding units 5 and 6 are smoothly supported by the slide rails 7 and 8 via the guide rollers 26 and smoothly move in the roll axis direction by the rotation of the traverse motor 58 and the engagement of the pinion 58a and the rack 14. It is possible to move.

It is necessary that the roll grinding units 5 and 6 do not interfere with the bearing housing 3 when the work roll 1a is replaced. For this reason, both ends of the upper slide rail 7 are slidably supported by guides 9 attached to the stand 4, and the roll grinding units 5 a and 5 b are moved rearward together with the slide rails 8 by the cylinder 11 and the guide 9. I do. Both ends of the lower slide rail 8 are supported by the entrance guide 10, and the lower roll grinding unit 6 is moved rearward together with the entrance guide 10 by a driving device (not shown).

In the roll grinding units 5 and 6, the feed motor 57 of the feed device 22 and the traverse motor 58 of the traverse device 24 are controlled by control devices 13a and 13b, respectively, as shown in FIG. The detection signals of the load cell 53, the encoder 57a of the feed device 23, and the encoder 58b of the traverse device 24 are sent to the information processing device 13c and processed.

On the other hand, the liquid motor 54 for rotating the rotary grindstone 20 is rotated by the pressure oil sent from the hydraulic pump 70 and returned to the tank 71. At this time, the supply amount of the pressure oil is controlled by the flow control valve 72, The rotation speed of the pressure motor 54 is controlled to control the peripheral speed of the rotary grindstone 20 to an arbitrary speed. The flow control valve 72 is controlled by the control device 13d.
A pressure gauge 73a for measuring the pressure of the pressure oil sent to the liquid motor 54 and a pressure gauge 73b for measuring the pressure of the pressure oil returned to the tank 71 are provided. It is sent to the device 13c.

The information processing device 13c has various processing functions, and outputs a signal resulting from the processing to the control devices 13a, 13a.
b, 13d to control the liquid motor 54, the feed motor 57, and the traverse motor 58. Information processing device 13
The processing function of c will be described later.

Next, the operation and control of the online roll grinding apparatus of the present embodiment will be described. First, the basic operation of the online roll grinding device of the present embodiment will be described.

The work roll 1a has a capacity of 10 rolls depending on the rolling speed.
And has 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 grinding machine, the cylindrical grindstone and the work roll come into contact via the abrasive grains on the grindstone surface, and the metal and abrasive grains on the roll surface are removed. It starts to grind while hitting.

When the abrasive grains come into contact with the metal on the surface of the work roll, the work roll is ground, and at the next moment, the grindstone separates from the work roll, and the abrasive grains rotate and rotate. Such discontinuous grinding causes a chatter phenomenon, resulting in a work roll surface and cross section having irregularities as shown in FIGS. 8 and 9.

If the grindstone causes the same vibration as that of the work roll, no change occurs in the contact force between the grindstone and the work roll. However, vibrating the grinding wheel and the entire grinding wheel frame so as to be synchronized with the work roll requires that the work roll vibration be 150 c / s.
It is difficult to follow because of the high frequency. If the vibration of the work roll is not missed by the grindstone and the whole grindstone frame, but the elasticity of the grindstone itself is absorbed and the vibration is absorbed by the flexure of the grindstone, the mass of the movable part is reduced, so the vibration of the workroll can be quickly performed. And the fluctuation of the contact force between the grinding wheel and the work roll is reduced.

In this embodiment, the grinding wheel itself is provided with an elastic body function by making the thin disk 52, which is a part of the rotating grindstone 20, have an elastic body function. Is 1000m / min to 1600m / mi on the outer circumference
While rotating so as to reach n, the work roll 1a is pressed and bent. The work roll 1a vibrates back and forth as described above. The rotating grindstone 20 is pushed by this vibration, but at that time, the thin disk 52 is bent as shown in FIG. 5, and the vibration from the work roll 1a is instantaneously absorbed. Thus, the variation in the contact force between the abrasive 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 chatter phenomenon can be eliminated.

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

That is, in this embodiment, the thin disk 52, which is the base metal of the abrasive layer 51, has an elastic body function. Also,
In order to effectively exert the elastic body function, the rotating 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 grindstone center as shown in FIG. . In this manner, the thin disk 52 is bent in a cantilever shape by the pressing force against the work roll 1a, and the vibration from the work roll 1a can be absorbed.

In order to bend the thin disk 52, FIG.
As shown in FIG. 0, the axis of the grinding wheel rotating shaft 21 is
The rotating grindstone 20A may be arranged so as to be offset with respect to the axis of. In addition, since the abrasive layer 51 has an annular shape, even if the rotating grindstone 20 is pressed in parallel to the work roll 1a, the abrasive disk is supported by the two abrasive layer portions on both sides of the center of the grindstone, and the thin disk 52 bends. Can be. However, in this case, since both ends are supported, the amount of bending is reduced. When supported at one location as in the present embodiment, greater bending can be obtained using the same thin disk 52.

The grinding wheel has an allowable change range of the contact force between the work roll and the grinding wheel depending on the grinding ability of the abrasive grains. In the case where the grindstone itself has an elastic body function, the following conditions are required in order for the contact force to be properly maintained within the allowable change range and the grindstone not to resonate even when 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 grinding wheel itself is in contact with the grinding stone. If the spring constant K is smaller than the allowable change range F of the force and the work roll piece amplitude Amax, the grindstone can be ground by always following the work roll.

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, it is better to set the natural frequency of the grindstone as far as possible from the frequency of the work roll.

Fn> Frmax Fn: Natural frequency of the grinding wheel Frmax: Maximum frequency of the work roll By the way, the natural frequency of the grinding wheel is represented by the following equation.

[0096]

(Equation 1)

M: Mass of grindstone containing elastic body (mass of movable part) Therefore, when increasing the natural frequency of the grindstone, increase spring constant K of the elastic body or mass M of grindstone containing elastic body.
Must be reduced. The spring constant of the elastic body cannot be 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 = 4Kgf, Amax = 30μ
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) based abrasive grains generally used as a grindstone, if the mass of the grindstone is suppressed to 0.2 kg, the grindstone is immediately consumed. Therefore, it is necessary to change the grindstone many times a day, which greatly impairs the effect of the work roll grinding in the rolling mill.

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

[0101] Aluminum oxide (Al2
With a grindstone using O3) or silicon carbide (SiC) -based abrasive grains, it is difficult to increase the grinding ratio to 3 or more when a hard work roll is ground. However, the rotating grindstone 20 of this embodiment, which is manufactured using crystal boron nitride abrasive grains (generally called CBN) or diamond abrasive grains, which are super abrasive grains, grinds the work roll 1a. Also has a grinding ratio exceeding 300, and is made of aluminum oxide (Al2O3) or silicon carbide (Si).
C) It has a grinding ratio 100 times or more that of a grindstone using system-based abrasive grains. By taking advantage of this high grinding ratio of superabrasives, and using these abrasives as a grindstone for online roll grinding equipment,
Long grinding is possible with a small weight.

Also, in this embodiment, the base metal provided with the abrasive layer 51 is used as a thin disk 52, and the thin disk 52 is provided with an elastic body function, and the abrasive layer 51 and the elastic body functional member are integrated. I have. For this reason, 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, so that the mass of the movable portion can be extremely reduced, 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 portion, a super-abrasive having a high grinding ratio (light weight and a long grinding wheel life) is used for the abrasive layer 51 and has an appropriate spring constant. Since the rotating grindstone 20 integrated with the thin disk 52 is pressed against the work roll 1a while rotating, the vibrating work roll can be correctly ground for a long time without causing chattering due to resonance.

Next, an appropriate spring constant of the thin disk 52 will be described with reference to experimental data shown in FIG. FIG.
Shows experimental data on the relationship between the spring constant of the thin disk 52 and the grinding ratio, and the peripheral speed vr of the work roll 1a is 300 m
/ Min, peripheral speed vg of the grindstone = 1570 m / min, moving speed (traverse speed) of the grindstone in the roll axis direction vs = 1
0 mm / sec, vibration frequency f of work roll 1a = 35
Hz and the half amplitude a of the work roll 1a are 0.01 mm.

As shown in FIG. 5, when the spring constant is large, the grinding ratio decreases, and when the spring constant decreases, the grinding ratio increases. That is, if the spring constant is large, chatter marks are formed, the grinding ratio is deteriorated, and the abrasive grain layer 51 is worn out early. In order to minimize the frequency of replacement of the rotary whetstone 20 and prevent the productivity from being lowered due to the replacement of the whetstone, it is necessary that the whetstone can be continuously ground for five days or more by one replacement. This generally requires a grinding ratio of at least 50, preferably at least 250. Rotary whetstone 2 made of superabrasives
Since 0 is expensive, the grinding ratio must be as high as possible to reduce production costs. If the spring constant of the thin disk 52 is large, the grinding ratio decreases because the work roll 1a
This is because the fluctuation of the contact force generated on the rotary grindstone 20 due to the vibration of the vibration increases, so that a large force acts on the abrasive grains of the abrasive grain layer 51 and the abrasive grains fall off by the force. Also, the thin disk 52
When the spring constant of the work roll 1a is large, the vibration of the work roll 1a cannot be absorbed by the rotating grindstone 20 and the load is transmitted to the load cell 53, so that the measured value of the contact force varies greatly. It becomes difficult to control the grinding amount (described later).

On the other hand, when the spring constant is reduced, the fluctuation of the contact force generated on the rotating grindstone 20 by the vibration of the work roll 1a is reduced, so that the grinding ratio is increased. The accuracy of is reduced. The reason why the grinding control and the roll profile measurement accuracy decrease is that the force acting on the grinding wheel rotating shaft 21 is small even if the rotating grinding wheel 20 is bent.
This is because it becomes impossible to detect the change in the load in No.

For example, the spring constant of the thin disk 52 is set to 50K.
Assuming that gf / mm, the load difference generated by the step of 10 μm is ΔF = 50 × 0.01 = 0.5 (Kgf), which is close to the limit of the detection range, judging from the resolution of the general load cell 53. In addition, the fact that the spring constant of the thin disk 52 is small means that the thin disk 52 is thin, the amount of deflection of the rotary grindstone 20 with the same contact force increases, and an excessive force acts on the abrasive layer 51 due to strain, Spring constant is 30Kgf / m
m, the contact force required for grinding causes the abrasive layer 51
Cracks occur between the thin disk 52 and the abrasive layer 51.

From the above conditions, the spring constant of the thin disk 52 is preferably from 1000 kgf / mm to 30 kgf / mm.
It has been found that 500 kgf / mm to 50 kgf / mm is preferable if possible.

Next, the composition of the abrasive layer 51 will be described. When the abrasive layer 51 made of superabrasive grains is used for the rotary grindstone 20, the abrasive layer 51 is used in off-line roll grinding to stabilize the grinding ability and stabilize the grinding roughness.
Dressing is usually performed. However, in online grinding, it is difficult to dress the abrasive grain layer 51 due to a space problem or the like. In order to stabilize the grinding roughness without dressing by online grinding and stabilize the grinding roughness, it is necessary for the superabrasive grains 51 to spontaneously sharpen at a constant speed. In order for the superabrasive grains to properly sprout by themselves, it is necessary to adjust the load applied to one superabrasive grain. For this purpose, a resin bond is used as a binder that increases the density of superabrasive grains contained in the abrasive grain layer 51, that is, the degree of concentration from 50 to 100, and wears together with the superabrasive grains while holding the superabrasive grains. There is a need. When the concentration is 100 or more, spontaneous cutting becomes difficult to occur, and the grinding ability is reduced. Concentration 5
If it is less than 0, the life is shortened. Also, if a vitrified bond or the like that is not easily worn is used as the binder, the amount of the abrasive grains protruding from the surface of the binder is reduced, and dressing is required. When the concentration and the binder are within the above ranges, the superabrasive grains can easily be spontaneously generated and can be continuously ground without dressing. In addition, the surface roughness of the work roll 1a is set to an average roughness of 0.
It has also been found that the size of superabrasive grains, that is, the grain size, needs to be from 80 to 180 in order to make it 3 to 1.5 μm.

Next, the operation relating to the arrangement of the rotary grindstone 20 will be described. The rotating grindstone 20 is arranged so that the axis Gc1 of the grindstone rotating shaft 21 is inclined at a small angle α with respect to a line Sc perpendicular to the axis Rc of the work roll 1a, as described above. The contact line with the roll 1a is formed only on one side when viewed from the center of the grindstone. As described above, the thin disk 52 can effectively exhibit the elastic body function by such an arrangement of the rotary grindstone 20. Also, since the abrasive layer 51 has an annular shape, if the surface of the abrasive layer 51 is pressed in parallel to the work roll 1, the contact lines between the abrasive layer 51 and the work roll 1 a are located on both sides of the center of the grindstone. Two places are formed. When the contact force is formed at two places as described above, the grinding is performed at the two places at the same time.
If there is a step, the grinding surfaces at two locations interfere with each other to cause chattering, and the contact between the two locations makes it difficult to control the contact force between the rotating grindstone and the work roll. In this embodiment,
Since the contact line between the annular abrasive grain layer 51 and the work roll 1a is formed at one location on one side of the center of the grindstone, chattering is prevented and contact force control (described later) can be performed appropriately.

When the grindstone rotating shaft 21 is tilted by a small angle α with respect to the axis perpendicular to the axis of the work roll 1a, as shown in FIG. 12, a non-grinding portion is formed at one end of the work roll 1a. The stand 4 and the rotary grindstone 20 may interfere with each other. Therefore, the rotary grindstone 20 of the roll grinding unit 5a
As shown in FIG. 6, the rotary grindstones 20 of the roll grinding unit 5b are arranged such that the axes Gc1 of the respective grindstone rotating shafts 21 are opposite to each other with respect to a line Sc perpendicular to the axis Rc of the work roll 1a. The contact line between the abrasive grain layer 51 and the work roll 1a is formed only on each roll end side in the roll axis direction when viewed from the center of the grindstone. Thus, the entire length of the work roll 1a can be ground without causing interference with the stand as described above. The same applies to the rotary grindstone 20 of the roll grinding unit 6a and the rotary grindstone 20 of the roll grinding unit 6b.

Next, the control of the online roll grinding apparatus of the present embodiment will be described. The online roll grinding apparatus of the present embodiment has control functions of roll profile grinding control, independent grinding control, lap section dispersion control, roll profile measurement as an online roll profile meter, roll profile correction, and a combination of roll profile measurement and profile grinding control. These control functions are stored in advance in the information processing device 13c as programs.

Roll Profile Grinding Control First, the roll profile grinding control function will be described. FIG. 13 shows experimental data on the relationship between the contact force F between the abrasive layer 51 of the rotating grindstone 20 and the work roll 1a and the grinding amount Q per unit time, and the peripheral speed of the grindstone vg = 1570 m / m.
in, the moving speed (traverse speed) of the grindstone in the roll axis direction vs = 10 mm / sec, the vibration frequency f of the work roll 1a = 35 Hz, and the one-sided amplitude a = 0.0 of the work roll 1a.
1 mm, peripheral speed vr of work roll 1a = 300 m /
It summarizes data for min, 600 m / min, and 900 m / min. As can be seen from this figure, the grinding amount Q per unit time changes substantially linearly due to the difference in the contact force F between the abrasive layer 51 and the work roll 1a. Therefore, the roll grinding unit 5,
The contact force F between the abrasive layer 51 and the work roll 1a is controlled by the feed device 23 provided in the apparatus 6, and the grinding amount Q of the work roll 1a can be arbitrarily changed.

In this embodiment, in order to perform the above control,
The load cell 53 is disposed so as to contact the end of the grindstone rotating shaft 21 on the side opposite to the grindstone, and the contact force F is detected more correctly.
Further, the relationship between the contact force F and the grinding amount Q shown in FIG. 13 is stored in the information processing device 13c shown in FIG. 7, and the detected contact force F is input to the information processing device 13c to obtain the target grinding amount. The contact force F is controlled by changing the amount of deflection of the thin disk 52 by the feed motor 57 (see FIG. 21). Thereby, the work roll 1a can be ground to a predetermined profile.

Further, when the contact force between the abrasive layer 51 and the work roll 1a is kept constant and the moving speed (traverse speed) of the abrasive layer 51 in the direction of the work roll is changed, the amount of grinding changes. If the abrasive layer 51 is moved quickly, the abrasive contact time at the same position is shortened, and the amount of grinding is reduced. If you move it slowly, the grinding amount will be increased. Therefore, the grinding amount of the work roll 1a can be arbitrarily changed by controlling the traverse speed of the abrasive layer 51.

That is, the detected contact force F is applied to the information processing device 1
3c so that the contact force F is constant.
7, the traverse speed of the abrasive layer 51 is controlled by the traverse motor 58 so that the desired amount of grinding is achieved while controlling the amount of deflection of the thin disk 52 (see FIG. 21). Thereby, the work roll 1a can be ground to a predetermined profile.

Further, since the contact force F and the load of the liquid motor 54 for rotating the rotary grindstone 20 have a fixed relationship, the load of the liquid motor 54 is detected instead of detecting the contact force F, and this load is controlled. However, the grinding amount Q can be changed. More specifically, the pressure gauges 73a and 73b detect the liquid pressures at the inlet and the outlet of the liquid motor 54, and the information processing device 13c calculates the pressure difference as the load of the liquid motor 54. Is adjusted by controlling the contact force F by the feeder 23 so as to increase the grinding amount. This method can also grind the rolling roll 1a into an arbitrary profile.

When the contact force between the abrasive layer 51 and the work roll 1a is controlled by the feeder 23 as described above, if there is play in the axial direction of the grindstone rotating shaft 21, the work roll 1a moves back and forth. The movable mass increases at a stretch, and the contact force between the abrasive layer 51 and the work roll 1a greatly changes. If the change in the contact force is large, the contact force cannot be controlled by the feeder 23. In this embodiment, in order to reduce the play as much as possible, a backlashless type preload ball screw 56 is used for the feeder 23, and other sliding parts also use parts with a small gap. In addition, ball screw 5
The feed motor 57 for driving the motor 6 is an electric motor. Thereby, the control of the contact force in the feed device 23 becomes easy, and the position of the rotary grindstone 20 can be maintained during the grinding and the rotary grindstone 20 can be finely moved back and forth.

Independent grinding control Next, the independent grinding control of the roll grinding units 5a, 5b or 6a, 6b will be described. In the work roll 1a, the rolled portion is worn by about 2 μm / radius by one coil rolling due to the contact with the steel plate, and the non-rolled portion is not worn because it does not contact the steel plate. For this reason, a step occurs between the non-rolled portion and the rolled portion.
The non-rolled portions are at both ends of the operation side and the drive side of the work roll 1a.

Here, two roll grinding units 5a,
When the roll grinding unit 5a or 6a is located at the non-rolling section on the operation side when the 5b or 6a, 6b are combined into one frame, the roll grinding unit 5b or 6b is located at the center of the work roll 1a. Becomes For this reason, if one of the non-rolled portions is ground by one of the roll grinding units, the other roll grinding unit is positioned at the rolled portion, and the non-rolled portion cannot be ground.

When the two roll grinding units are combined into one frame, the length becomes at least half the length of the work roll 1a. There is a problem that the work roll 1a cannot be cooled.

In this embodiment, two roll grinding units 5a, 5b or 6a,
6b, which can be ground independently of each other. For this reason, the two roll grinding units 5a, 5b
Alternatively, the roles of 6a and 6b can be separated, and the non-rolled portion on the operation side can be mainly ground by the roll grinding unit 5a or 6a, and the non-rolled portion on the drive side can be mainly ground by the roll grinding unit 5b or 6b. Thus, the non-rolled portion that does not wear can be ground more, so that a step does not occur between the rolled portion and the non-rolled portion. Such control is performed by the control device 1
3b, the traverse motor 58 is rotated, and the pinion 58b is engaged with the rack 14 to move the roll grinding unit 5 or 6 on the slide rails 7, 8, and is sent by a command from the control device 13a. This is performed by rotating the motor 57 and moving the abrasive grain layer 51 forward by feeding the ball screw 56.

Further, the roll grinding unit 5 or 6 is sometimes moved to the center of the work roll 1a in order to remove the roughened surface or the surface fatigue layer on the roll surface of the rolling section. Such control is also performed by rotating the traverse motor 58 and moving the roll grinding unit 5 or 6 according to a command from the control device 13b.

As described above, the non-rolled portions at both ends of the work roll 1a can be efficiently ground to maintain a constant work roll profile for a long time. In the case where the work roll 1a is long as in the case of a thick plate rolling mill, three or four roll grinding units 5, 6 are provided, each of which is independently moved to a portion requiring grinding and grinding is performed. What should be done is.

In this embodiment, since the roll grinding units 5a, 5b or 6a, 6b are separated from each other, it is necessary to sufficiently cool the work roll 1a with the cooling water injected from the crank header 15 during rolling. Can be.

Next, dispersion control of a grinding lap formed by using a plurality of roll grinding units 5 or 6 will be described. A plurality of roll grinding units 5a, 5b or 6a, 6
14B is moved to the center of the work roll 1a, FIG.
As shown in (A), the grinding portions of the adjacent rotary grindstones 20a and 20b wrap at the center. At this time, if the grinding always wraps at the same position Ta, the lapping portion is ground more than the other portions, and a grinding error occurs in the lap portion.

When a plurality of grinding units are combined into one frame, the corresponding plurality of rotating grindstones always move in the same stroke as a single unit. Inevitably, the grinding error may occur, and a step may be generated on the work roll surface.

In this embodiment, the two roll grinding units 5a, 5b or 6a, 6b are operated independently, so that the grinding lap portions of the rotary grindstones 20a, 20b are stopped at one place as shown by the lap line Ta. Instead of FIG.
As shown in (B) and (C), it is possible to disperse in the range of the roll axis direction from the wrap line Tb to Tc, thereby reducing the grinding error of the wrap portion.

FIGS. 15 and 16 show the control procedure of the wrap distribution. This control procedure is stored as a program in the information processing device 13c. First, the grinding unit 5a
Starts the grinding from the operation side end of the work roll 1a toward the center of the roll (step 100), and the roll center Rm
Grind to a position on the drive side of the distance L1 (Step 10
1). Next, the moving direction of the grinding unit 5a is reversed and grinding is performed to the operation side end (step 102). Following this, the work roll 1 is moved by another grinding unit 5b.
Grinding is started from the drive side end of a toward the roll center (step 103), and grinding is performed from the roll center Rm to a position on the drive side of the distance L1 (step 104). Next, the moving direction of the grinding unit 5a is reversed to set the roll center Rm.
Grinding further to the position on the L2 operation side (step 105)
Following this, the moving direction of the grinding unit 5b is reversed and grinding is performed to the drive-side end (step 106). Next, the moving direction of the grinding unit 5a is reversed again to grind to the operation side end (step 107). Following this, the moving direction of the grinding unit 5b is reversed to grind from the center of the roll to the position on the L2 operation side. (Step 108). L
The above procedure is repeated by changing the values of 1 and L2 (steps 109 and 110). As described above, the work roll 1a can be ground while dispersing the wrap portion.

With an online role profile meter
Roll Profile Measurement Next, the operation of the online roll profile meter incorporated in the online roll grinding device will be described.

The thin disk 52 of the rotary grindstone 20 has an elastic function, and the work roll 1 is moved by the feed motor 57 of the feed device 22.
In the system of the present embodiment for controlling the contact force between a and the abrasive layer 51, the relationship between the roll profile, the position of the feeder, and the contact force is represented by the following equation with reference to the schematic diagram shown in FIG.

Z (x) = S (x) -F (x) / K where x: roll longitudinal direction coordinate Z (x): roll profile (mm) S (x): feeder position (mm) F ( x): Contact force between work roll and rotating grindstone (Kgf) K: Rotating grindstone part spring constant (Kgf / mm) First, feeder 23 is fixed, and the roll grinding unit is traversed in the axial direction of work roll 1a. , S (x)
Is always constant, the change in roll diameter is represented by ΔZ (x) = − ΔF (x) / K. Change in contact force between work roll and rotary grinding wheel Δ
The value obtained by dividing F (x) by the spring constant K is the amount of deflection of the rotary grindstone 20, that is, the change ΔZ (x) in the position of the roll surface,
A roll profile is obtained by organizing this change in the roll longitudinal direction coordinates. This is the first profile calculation function.

FIG. 18 shows a processing procedure of the first profile calculation function. This processing procedure is stored as a program in the information processing device 13c. First, the grinding unit 5
The rotating grindstone 20a is pressed against the operation side end of the work roll 1a to fix the feed device 23 (200). Next, the traverse motor 58 is rotated while the feeder 23 is fixed, and the grinding unit 5a is moved in the roll axis direction (step 201). During this movement, the abrasive layer 51 is
The change in the contact force between the wheel and the work roll 1a is measured (step 202), and the amount of deflection of the rotary grindstone 20 is calculated from the above relationship (step 203). At the same time, the position of the grinding unit 5a in the roll axis direction is measured by a signal from the encoder 58b of the traverse motor 58 (step 2).
04). Then, a roll profile is calculated from the position in the roll axis direction and the amount of deflection (step 205). A similar procedure is performed for the grinding unit 5b to calculate a roll profile (step 206). However, the movement in the roll axis direction is performed from the drive side end. Roll profiles obtained by moving the two grinding units 5a and 5b are combined to determine a profile of the entire length of the work roll 1a (step 207).

As another method for measuring the roll profile, the feeder 22 is controlled so that the contact force F (x) between the work roll and the rotary grindstone always has a constant load in the roll axis direction, and the position of the feeder is changed. ΔS (x) is detected.

Since F (x) / K is constant in the longitudinal direction of the roll, the change in roll diameter is represented by ΔZ (x) = ΔS (x). The change ΔS (x) in the position of the feeder is obtained from the value detected by the encoder 57a of the feed motor 57, and the change arranged in the roll longitudinal direction coordinates is the roll profile. This is the second profile calculation function.

FIG. 19 shows a processing procedure of the second profile calculation function. This processing procedure is stored as a program in the information processing device 13c. First, the grinding unit 5
The rotating grindstone 20a is pressed against the operation side end of the work roll 1a (step 300). Next, the traverse motor 58 is rotated while the feeder 23 is fixed, and the grinding unit 5 is rotated.
a is moved in the roll axis direction (step 301). During this movement, the abrasive layer 51 and the work roll 1 are
a, and controls the feed position by the feed motor 57 so that the contact force becomes constant (step 30).
2) The feed amount of the rotary grindstone 20 is calculated based on a signal from the encoder 57a of the feed motor 57 (step 30).
3). At the same time, the position of the grinding unit 5a in the roll axis direction is measured based on a signal from the encoder 58b of the traverse motor 58 (step 304). Then, a roll profile is calculated from the position in the roll axis direction and the feed amount of the rotary grindstone (step 305). Grinding unit 5
The same procedure is performed for b to calculate the role profile (step 306). However, the movement in the roll axis direction is performed from the drive side end. Two grinding units 5
The roll profiles obtained by the movements of a and 5b are combined to determine the profile of the entire length of the work roll 1a (step 307). As described above, the profile of the work roll can be measured online using the equipment of the online grinding device.

Roll Profile Correction Calculation Next, a description will be given of a function of correcting the roll profile based on the measured value of the offline profile meter. Sliding rails 7 and 8 of the online roll grinding device are work rolls 1a
However, in a hot rolling mill, the parallelism may change for a long time due to the heat of the rolled material. Unless this is corrected, the work roll profile measured as described above cannot be said to be a true profile. The information processing device 13c corrects this according to the procedure shown in FIG.

First, the work roll 1a is ground in advance by an offline roll grinder installed in a roll shop, and the roll profile after grinding is measured by an offline roll profile meter. Then, the measured role profile is input to the information processing device 13c (step 400). Next, after the work roll 1a that has been subjected to the offline roll grinder grinding is incorporated into a rolling mill, the profile of the work roll 1a is measured using the first or second profile calculation function of the online profile meter (step 401). Then, the deviation between the offline and online profile meters is determined (step 402). The obtained deviation is recognized as deformation (parallelism error) of the sliding rail of the grinding device and stored in the information processing device 13c (step 403). Next, at the time of subsequent rolling, after grinding the rolling roll 1a online,
Work roll 1a with first or second profile calculation function
Is measured (step 404), and the measured value of the roll profile is corrected by subtracting the parallelism error obtained as described above (step 405), and the obtained correct measured value is sent to the information processing device 13c. It is stored (step 406). Thereby, a more accurate profile of the work roll 1a can be obtained.

Roll profile measurement and roll profile
Combination with Wheel Grinding Control Next, the function of grinding the work roll to the target profile by the grinding control method described above using the profile data of the work roll 1a obtained as described above will be described with reference to FIG. . The processing procedure shown in FIG.
3c is stored in advance.

First, the target role profile is input to the information processing device 13c in advance (step 500), and the profile of the work roll 1a is obtained by the first or second profile calculation function (step 501). In this case, the above-described processing for correcting the roll profile based on the measured value of the offline profile meter is performed as necessary. When an accurate profile of the work roll 1a is obtained, a deviation between the obtained work roll profile and the target roll profile is obtained (step 502). The required grinding amount at each position is calculated from the deviation amount at each position in the roll axis direction (step 503), and the grinding conditions at each position in the roll axis direction are calculated (step 504). Here, when performing the grinding control for changing the contact pressure, FIG.
3, the contact force between the work roll 1 a and the abrasive layer 51 is controlled by the feed motor 57 of the feed device 22 to reduce the work roll grinding amount. By changing, the work roll 1a is ground to the target profile (step 505). When the grinding control for changing the traverse speed is performed, the traverse speed of the rotary grindstone 20 is controlled by the traverse motor 58 of the traverse device 24, and the work roll 1a is ground to the target profile by changing the work roll grinding amount. (Step 505). As described above, a profile that matches the target roll profile is created on the work roll 1a.

Second Embodiment A second embodiment of the present invention will be described with reference to FIGS. In the drawings, members that are the same as the members shown in FIGS. 1 to 7 are given the same reference numerals. In the hot rolling mill, as the wear of the stand 4 and the bearing box 3 progresses due to the influence of cooling water and the like, the shaft of the work roll 1a perpendicular to the rolled material S as shown in FIG. The heart Ra may be inclined like Rb. In the present embodiment, the target roll profile is maintained or corrected in consideration of such inclination of the work roll 1a.

FIG. 23 is a flowchart showing the control procedure of the present embodiment, and this procedure is stored as a program in the information processing apparatus 13c (see FIG. 7).

First, in order to determine the inclination of the axis of the work roll 1a, the roll grinding units 5a and 5b are moved to the roll ends on the operation side and the drive side, respectively (step 60).
0), the respective feed motors 57 are rotated at the roll ends on the operation side and the drive side, and the abrasive layer 5 of the rotary grindstone 20 is rotated.
1 is pressed against the work roll 1a (step 601).
Then, the rotary grindstone 20 is pressed to the point where the load is detected by the load cell 53, and the feed amount of the rotary grindstone from the reference position at that time is measured by the encoder 57a built in the feed motor 57 (step 602). The load for measuring the feed amount of the rotary grindstone is the same on the operation side and the drive side.

Next, the rotary grindstone 2 on the operation side and the drive side
The difference of the feed amount of 0 is calculated (step 603), and the difference of the feed amount is divided by the distance between the measurement on the operation side and the drive side to obtain the inclination of the axis of the work roll 1a and stored (step 60).
4).

Next, at the time of grinding the work roll 1a, the rotating grindstone 2 for obtaining the target profile by the method described above.
The feed position of 0 is calculated (step 605), and the feed position is corrected using the stored inclination of the axis of the work roll 1a (step 606), and the abrasive layer 51 is removed from the axis of the work roll 1a. The rotation speed of the grindstone feed motor 57 is controlled so that the distance to the tip becomes constant (step 607).

With this control, even if the work roll 1a is inclined, the distance between the roll axis and the abrasive grain layer 51 is always constant, and fixed-position grinding can be performed. In this fixed position grinding, if there is a step between the rolled portion and the non-rolled portion as shown in FIG. 2, the non-rolled portion has a large amount of deflection of the thin disk 52, and the rolled portion has a small roll diameter and the deflection of the thin disk 52. The amount is smaller. The difference in the amount of deflection is the difference in the contact force between the abrasive layer 51 and the work roll 1a, and the difference in the contact force is the difference in the grinding ability. That is, the non-rolled portion is ground more than the rolled portion, and the step between the rolled portion and the non-rolled portion can be gradually eliminated. Thus, even if the axis of the work roll 1a is inclined, a roll profile having the same diameter can be produced.

In the above-mentioned fixed position grinding, if the axis of the work roll 1a changes during rolling, an error occurs in profile grinding. To prevent this, roll vendor 3
A bearing box pressing device 31 for pressing the bearing box 3 horizontally against the bender block 30a on the opposite side is provided on the 0, 30 bender block 30a. The pressing device 31 may be attached to the bearing box 3 side instead of the bender block 30a. The bearing box pressing device 31 includes a piston 32 and a hydraulic chamber 33. The hydraulic pressure supplied to the hydraulic chamber 33 presses the piston 32, and the force of the piston 32 causes the bearing box 3 to move to the opposite bender block 30a. Be abutted. By providing this bearing box pressing device 31 in both bearing boxes 3, 3, the axis of the work roll 1 a is fixed at a constant level and ground to a target profile without being affected by wear of the stand 4 and the bearing box 3. it can.

When attaching an arbitrary roll profile to the work roll 1a, the work roll 1a is ground to an arbitrary roll profile by an off-line roll grinder, and the information processing device 13c is used.
(See FIG. 7), the roll profile is set in advance as a target roll profile. Thereafter, the number of rotations of the grindstone feed motor 57 is controlled to move the grindstone 20 along the roll profile to perform position control grinding. Even if the rolling section of the work roll 1a wears and the roll profile collapses, the rotating grindstone 20 moves on the correct roll profile, so that the initial roll profile can always be correctly maintained by the correction grinding. Also in this case, for the inclination of the axis of the work roll 1a, the inclination angle of the axis of the work roll 1a is obtained from the feed amount of the rotary grindstone 20 on the operation side and the drive side as described above. Considering this, the rotation speed of the grinding wheel feed motor 57 is controlled so that the rotating grinding wheel 20 follows the target roll profile. Thereby, even if the axis of work roll 1a is inclined, work roll 1a can be maintained at a constant correct roll profile for a long time.

When the inclination angle of the axis of the work roll 1a calculated from the feed amount of the rotary grindstone 20 exceeds a certain allowable value, it leads to meandering of the rolled material S and the like, and the information processing apparatus 13c issues an alarm. Can also be emitted.

Third Embodiment A third embodiment of the present invention will be described with reference to FIG. In this embodiment, sheet crown control is performed based on the measured value of the roll profile.

After the work roll 1a is ground by the off-line grinder, the work roll 1a is incorporated into the stand 4, and when the rolled material S is rolled, a thermal crown is generated by the heat of the rolled material S. Conventionally, this thermal crown is calculated by a process computer (not shown), and the work roll 1a is bent by a roll bender 30 provided in the rolling mill according to the amount of the thermal crown so that the sheet crown of the rolled material S approaches a target value. Controlling. However, the thermal crown calculated by the process computer often differs from the actual thermal crown depending on conditions.

In the present embodiment, in order to prevent this, the crown control is performed according to the procedure shown in FIG. First, a roll profile is measured by the first or second roll profile calculation function described above (step 700). This is performed by the program stored in the information processing device 13c (see FIG. 7) as described above. Next, the host computer calculates the optimum bender force of the roll bender 30 from the target plate crown and the target plate shape, taking into account the measured roll profile (step 701), and rolls the roll according to the calculation result. The work roll 1a is bent by controlling the bender force of the bender 30 (step 702), and rolling is performed in this state (step 7).
03). Thereby, the sheet crown of the rolled material S can be made closer to the target value.

Although not shown, in the case of a rolling mill provided with a roll shift device for shifting the work roll in the axial direction, the bender force is controlled, and the shift position of the work roll in the axial direction is controlled. The sheet crown of the rolled material S can be made closer to a target value. One work roll 1
In the case of a rolling mill provided with a roll crossing device that crosses a and 1a in the horizontal direction, it is possible to control the bender force and the crossing angle to make the sheet crown of the rolled material S closer to a target value. Of course, by inputting the profile value obtained by the measurement of the roll profile after each grinding into the process computer and using the above-mentioned shape control means, the sheet crown is further improved in the entire length of the sheet.

Fourth Embodiment A fourth embodiment of the present invention will be described with reference to FIGS. In the drawings, members that are the same as the members illustrated in FIGS. 1 to 7 are given the same reference numerals.

If the work roll 1a is continuously ground by the above-mentioned online roll grinding device for a long time, errors in the amount of grinding may accumulate, and a difference in roll diameter between upper and lower work rolls, that is, a diameter difference may occur. When the diameter difference is generally larger than 0.2 mm / diameter, the difference in rolling torque between the upper and lower work rolls exceeds an allowable value, and if the difference further increases, the roll driving spindle and the like are damaged. In order to prevent this, it is necessary to measure the upper and lower work roll diameters after grinding at certain time intervals. In the present embodiment, a system for measuring the roll diameter of a work roll ground online is added to the above-described online roll grinding apparatus.

In FIG. 25, at least one end of the work roll 1a is formed with a reference small-diameter portion 39a which is ground and measured by an off-line grinder to a smaller diameter than the plate passing plate portion. The roll diameter of the reference small diameter portion 39a is D1 as shown in FIG. In addition, the roll grinding device 5
The roll step measuring device 40 is integrally attached to the case 25. The same applies to the roll grinding device 6.

The roll level difference measuring device 40 includes a piston 41
a, which has a measurement rod 41, a piston 41a, and a case 42 for guiding the measurement rod 41, and the case 42 is attached to a cover 47 attached to a body 59, and the case 42 moves together with the rotary grindstone 20. I can do it. In the case 42, a hydraulic pressure chamber 46 for pushing the piston 41a and the measuring rod 41 in the direction of the work roll is formed, and a displacement gauge 43 for measuring a moving amount of the measuring rod 41, A spring 44 for removing the hydraulic pressure from the pressure chamber 46 and retracting the measuring rod 41
Is arranged.

Next, a method of measuring the work roll diameter by the roll level difference measuring device 40 will be described with reference to FIG. FIG.
In, the roll grinding device 5 is moved in the roll axis direction so that the measurement rod 41 is at the position A, and stopped at this position. Next, hydraulic pressure is applied to the hydraulic chamber 46 at this position, and the measuring rod 41 is brought into contact with the reference small diameter portion 39a of the work roll 1a. The position of the measuring rod at that time is measured using the displacement meter 43, then the grinding wheel unit 5 is moved to the position B, the measuring rod 41 is pressed again to the work roll 1a, and the position is measured using the displacement meter 43. . The deviation of the value measured using the displacement meter 43 at the A position and the B position is calculated by the information processing device 13c (see FIG. 7) to obtain the roll step. Assuming that this step is x, the diameter D of the work roll 1a is D = D1
+ 2x. More precisely, if the work roll 1a is rotated half a turn and the steps are measured again on the opposite side by 180 degrees and the steps are x1 and x2, the diameter D of the work roll 1a is D
= D1 + x1 + x2. The diameter difference can be obtained from the upper and lower roll diameters thus obtained.

Next, a method of measuring the cylindricity of the work roll 1a using the roll level difference measuring device 40 will be described. As shown in FIG. 27, the measured reference small diameter portions 39a and 39b are formed at both ends of the work roll 1a. Standard small diameter part 3
On the 9a side, the displacement of the measuring rod 31 at the A position and the B position is measured as described above, and the diameter difference x between the reference small diameter portion 39a and the work roll 1a is obtained. Similarly, on the reference small diameter portion 39b side, another roll grinding unit 5 is similarly moved to measure the displacement of the measurement rod 31 at the C position and the D position, and the diameter difference y between the reference small diameter portion 39b and the work roll 1a is obtained. . A deviation xy of the diameter difference is obtained from the two diameter differences x and y. Cylindricity is obtained by dividing the deviation of the diameter difference by the distance between the measurements. The obtained cylindricity can be used for correcting the inclination of the axis of the work roll 1a in the measurement by the roll profile meter.

Next, the wear amount of the abrasive grain layer 51 is measured by using the level difference measuring device 40, and the replacement information of the abrasive grain layer 51 can be displayed. FIG. 2 shows a method of measuring the wear amount of the abrasive layer 51.
8 will be described.

First, after the new rotary grindstone 20 is mounted on the rolling mill, the abrasive layer 51 is pressed against the work roll 1a by the feed unit 23 with a predetermined force as shown at the F position, and the work is performed by the grinding unit 5 at that time. Displacement meter 4
3 and stored in the information processing device 13c (see FIG. 7). After grinding the work roll for a certain period of time, the same measurement as described above for the position E is performed by the same method as above, and the measured value of the displacement meter 43 is obtained. When the difference s between the previous measurement value and the current measurement value is obtained, the difference s is the amount of wear of the rotary grindstone 51 between two measurements. Assuming that the abrasive grain portion thickness t1 of the new abrasive grain layer 51 is the remaining abrasive grain portion thickness t2, t2 = t1
−s, and the replacement information of the abrasive layer 51 can be displayed based on the amount of t2.

Next, after grinding the work roll 1a, whether or not roll eccentricity has occurred can be measured by using the level difference measuring device 40. This measuring method is shown in FIGS.
This will be described with reference to FIG.

The measuring rod 41 is pressed against the reference small-diameter portion 39a of the work roll 1a, and at the same time, the rotating whetstone 20 is pressed against the work roll 1a while measuring the run-out of the work roll 1a. If there is no roll eccentricity, a run-out occurs due to the movement of the entire roll, but the reference small-diameter portion 39a and the grinding portion also run out in the same manner. The displacement obtained from the spring constant is the same.
However, if the rolls are eccentric, there will be a difference between the two displacements within one roll revolution. The difference between the displacements can be regarded as the amount of eccentricity.

Fifth Embodiment A fifth embodiment of the present invention will be described with reference to FIGS. 31 and 32 and with reference to FIG. In this embodiment, the diameter of the work roll 1a is measured without using a displacement meter. First, as shown in FIG. 31, a reference small diameter portion 60 is formed at the end of the work roll 1a. This is made by grinding the end of the work roll 1a with an off-line grinder to a diameter smaller by x than the roll diameter of a portion (grinding portion) to be ground by an online grinding device. This is the same as the fourth embodiment. Next, the roll diameter D1 of the reference small diameter portion 60 is measured and input to the information processing device 13c. The level difference x between the grinding portion and the reference small-diameter portion depends on the inclination of the rotary grindstone 20 with respect to the work roll 1a, but is suitably about 1 mm.

Next, the control procedure shown in FIG. 32 is performed.
This procedure is stored in the information processing apparatus 13c as a program in advance. First, the rotation of the work roll 1a and the rotation of the rotary grindstone 20 are stopped so that the reference small diameter portion 60 is not ground with the grindstone (steps 800 and 801). The rotating grindstone 20 is traversed to the position X of the reference small-diameter portion (step 802).
Is moved so as to be in contact with the work roll 1a. Further, the work roll 1a and the rotary grindstone 20 are pressed until a predetermined contact force is obtained (step 803). When the load cell 53 detects that the predetermined contact force has been obtained, the feed motor 57 is stopped, and the position is determined by the encoder 57a. Detect and store (step 804).

Next, it is determined whether the measurement has been performed at both the position X of the reference small diameter portion 60 and the position Y of the grinding portion (step 805). If not, the rotary grindstone 20 is traversed to the position Y of the grinding portion. (806), and the rotating grindstone 20 is pressed against the work roll 1a using the feeder 23 as in the case of the reference small diameter portion until a predetermined contact force is obtained (step 803).
The position of the rotary grindstone 20 is detected and stored by the encoder 57a when the predetermined contact force is obtained (step 804).

Next, the rotary grindstone 20 at the position X and the position Y
Is calculated (step 807). This difference becomes the step x. Finally, since the roll diameter D1 of the reference small-diameter portion 60 is known, the roll diameter Dn of the grinding portion is obtained from the following equation (step 808).

Dn = D1 + x Thus, the diameter of the work roll 1a after grinding can be easily obtained, and can be used for checking the roll replacement time and the difference between the upper and lower roll diameters.

Sixth Embodiment In the above, the roll grinding of the rolling roll 1a, ie, the working roll, has been described on-line. However, the rolling mill has upper and lower reinforcing rolls 1b, 1b which come into contact with the working roll. Roughness and a fatigue layer also occur on the surface.
FIG. 33 shows an embodiment in which an online roll grinding device is provided for the upper and lower reinforcing rolls 1b, 1b. This online roll grinding device for the reinforcing roll has basically the same configuration and function as the online roll grinding device for the work roll described above. As described above, the on-line roll grinding device is provided for the reinforcing rolls, and the surfaces of the upper and lower reinforcing rolls 1b, 1b are ground online in the same manner as the work rolls 1a, 1a.
The exchange pitch of b and 1b can be lengthened, and the productivity of the hot rolling equipment can be improved.

[0170]

According to the present invention, vibration of a rolling roll can be controlled.
Since the material is absorbed by the supporting member having a flexible elastic body function, grinding can be performed accurately and with good surface roughness without causing chattering and resonance.

Further, since super-abrasive grains are used for the abrasive grain layer of the rotary grindstone, the weight of the movable portion of the grindstone can be reduced, and resonance can be more effectively prevented. In addition, the life of the grinding wheel is extended,
The rolling roll can be ground for a long time during the rolling, whereby the frequency of changing the rolling roll can be greatly reduced, and the productivity of the rolling equipment can be greatly increased.

[0172] Further, since changing the grinding amount per unit of rotary grindstone time by changing the load of the contact force or the driving device of the rolling rolls and the abrasive layer, it is grinding the mill roll to any role profile it can.

Further, since a ball screw mechanism or a gear mechanism with small backlash is used for the pressing device , the spring constant of the feed mechanism is increased, and chattering caused by play of the feed mechanism can be prevented.

[0174] Further, since the arranged one rolling roll independently grinding capable least two roll grinding units, Ru can keep the roll profile no step along the entire length of the rolling rolls.

[0175] In addition, supported by the unit corresponding to the roll ends
Since the grinding is performed with the direction of inclination of the rotation axis of the holding member reversed, the entire length of the rolling roll can be ground without interfering with the stand.

[0176] Furthermore, since detecting the contact force between the mill roll and the abrasive layer to calculate the profile of the mill roll can be measured roll profile while simultaneously grinding the mill roll. Pressure from the roll profile obtained in this way
By controlling the contact force between the roll and the abrasive grain layer or the moving speed of the rotating grindstone in the roll axis direction, a target profile can be easily formed.

[0177] The detected or calculated rolling rolls
Since the profile control means such as a roll bender is controlled based on the profile , the plate crown can be controlled with high accuracy.

Further, since the grinding wheel is ground so as to move on the target roll profile, the profile of the rolling roll can be arbitrarily formed and maintained. At this time, the inclination of the roll axis is measured, and the target roll profile is calculated in consideration of the inclination of the axis.
Since grinding to move on the target roll profile, always Ru can maintain the correct roll profile be inclined is rolling roll axis.

[0179] In addition, create a standard small-diameter portion at the end of the rolling roll
Since the grinding unit itself measures the level difference between the reference small diameter portion and the grinding portion of the rolling roll, it is possible to always find the correct roll diameter and manage the difference between the upper and lower rolls online. Further, the cylindricity of the rolling roll can also be confirmed.

Further , an online roll grinding device and an online
Always use the in-roll profile meter at the same time
By maintaining the optimum roll profile for rolling
Thus, complete schedule-free rolling becomes possible.

Furthermore, the moving direction of the rotary grinding wheel and the rolling roll
Corrects the parallelism error of the
Can be measured.

[Brief description of the drawings]

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

FIG. 2 is a sectional view taken along the line II-II of FIG.

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

FIG. 4 is a longitudinal sectional view of a roll grinding unit.

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

FIG. 6 is a view showing an arrangement relationship of rotary grindstones of two roll grinding units.

FIG. 7 is a diagram illustrating a control system of the roll grinding unit.

FIG. 8 is an explanatory diagram of chattering phenomenon that produces a flaw on a roll surface.

FIG. 9 is a view showing a cross-sectional shape of a rolling roll shown in FIG.

FIG. 10 is a view showing another example of the arrangement of a rotary grindstone and its vibration absorbing action.

FIG. 11 is a diagram showing a relationship between a spring constant of a thin disk of a rotary grindstone and a grinding ratio.

FIG. 12 is a view showing interference between a rotary grindstone and a stand when grinding is performed by tilting the rotation axis of the rotary grindstone with respect to a line perpendicular to the roll axis.

FIG. 13 is a diagram showing a relationship between a contact force between a rolling roll and a rotating grindstone and a grinding amount.

14A is a diagram illustrating generation of a grinding lap portion when a plurality of rotary grindstones are provided, and FIGS. 14B and 14C are diagrams illustrating a control method for dispersing the grinding lap portion. FIG.

FIG. 15 is an explanatory diagram of wrap distribution control.

FIG. 16 is a flowchart illustrating a procedure of lap distribution control.

FIG. 17 is a diagram illustrating the positional relationship between the rolling roll, the feed device, and the deflection of the rotary grindstone when measuring the roll profile.

FIG. 18 is a flowchart illustrating a first roll profile calculation function.

FIG. 19 is a flowchart illustrating a second roll profile calculation function.

FIG. 20 is a flowchart showing a procedure for correcting a roll profile obtained by the first or second roll profile calculation function with data of a roll profile obtained offline.

FIG. 21 is a flowchart showing a procedure for grinding a rolling roll into a target profile using a roll profile obtained by the first or second roll profile calculation function.

FIG. 22 is a partial sectional plan view of a main part of a rolling mill provided with an online roll grinding device according to a second embodiment of the present invention.

FIG. 23 is a flowchart showing the grinding control in the second embodiment.

FIG. 24 is a flowchart showing rolling control according to a third embodiment of the present invention.

FIG. 25 is a cross-sectional view of a main part of a rolling mill provided with an online roll grinding device according to a fourth embodiment of the present invention.

FIG. 26 is a diagram showing a relationship between a rolling roll, a reference small-diameter portion, and a displacement of a measurement rod in a fourth embodiment.

FIG. 27 is a diagram for explaining a method of measuring a step and a method of measuring cylindricity in the fourth embodiment.

FIG. 28 is a view for explaining a method of measuring the amount of abrasive wear in the fourth embodiment.

FIG. 29 is a diagram for explaining a method of measuring roll eccentricity in the fourth embodiment.

FIG. 30 is a diagram for explaining a method of measuring roll eccentricity in the fourth embodiment.

FIG. 31 is a diagram for explaining a method of measuring a step in a rolling mill provided with an online roll grinding device according to a fifth embodiment of the present invention.

FIG. 32 is a flowchart showing a procedure for implementing the step difference measuring method according to the fifth embodiment.

FIG. 33 is a partial sectional side view of a main part of a rolling mill provided with an online roll grinding device according to a sixth embodiment of the present invention.

[Explanation of symbols]

 1a: Rolling roll (vertical work roll) 1b: Rolling roll (vertical reinforcing roll) 4: Stand 5: Lower roll grinding unit 6: Upper roll grinding unit 7; 8: Rail for traverse 13a; 13b; 13d: Controller 13c: Information processing device 14: Rack 20: Rotating grindstone 21: Grinding wheel rotating shaft 22: Driving device 23: Feeding device 24: Traverse device 31: Bearing box pressing device 39a: Reference small diameter portion 40: Roll level difference measuring device 43: Displacement meter 51: Abrasive layer 52: Thin disk 53: Load cell 54: Liquid motor 57: Feed motor 57a: Encoder 58: Traverse motor 58b: Encoder 60: Reference small diameter portion 70 Hydraulic pump 71 Tank 72 Flow control valve 73a, 73b Pressure gauge

Claims (23)

(57) [Claims] An on-line roll grinding device, which is provided facing a rolling roll and has a grinding device for grinding a rotating rolling roll, and a moving device for transferring the grinding device along the axial direction of the rolling roll. In the rolling mill provided, the grinding wheel device, a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll. A rolling device provided with an on-line roll grinding device, comprising: 2. An on-line roll grinding device, which is provided on a stand of a rolling mill and has a grinding device for grinding a rotating rolling roll, and a moving device for transferring the grinding device along the axial direction of the rolling roll. In the rolling mill, the grinding device is a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll. Having a pressing device, wherein the thin disk-shaped support member has a small mass sufficient to absorb the vibration of the rolling roll without resonating in a state pressed against the rolling roll. Rolling mill equipped with an on-line roll grinding apparatus. 3. An on-line roll grinding device, which is provided facing a rolling roll and has a grinding device for grinding a rotating rolling roll, and a moving device for transferring the grinding device along the axial direction of the rolling roll. In the rolling mill provided, the grinding wheel device, a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll. The pressing device has a high spring constant enough to bend only the thin disk-shaped support member in a state where the thin disk-shaped support member is pressed against a rolling roll. Features Rolling mill equipped with an on-line roll grinding apparatus that. 4. A rolling mill provided with an on-line roll grinding device according to claim 1, wherein the thin disk-shaped support member on which the abrasive layer is formed rolls a rotation axis when rotated by the driving device. A rolling mill equipped with an online roll grinding device, wherein the rolling mill is arranged to be inclined with respect to a direction perpendicular to the axis of the roll. 5. A rolling mill provided with an online roll grinding device according to claim 1, wherein said abrasive layer includes one of cubic boron nitride abrasive grains and diamond abrasive grains. Rolling mill equipped with. 6. A grindstone device arranged to face a rolling roll provided in a rolling mill and grinding a rolling roll that is rotating in a rolling operation, and a movement for transferring the grindstone device along the axial direction of the rolling roll. In the online roll grinding device having a device, the grinding wheel device is a thin disk-shaped having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll Support member, an abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and the thin disk-shaped support member together with the abrasive layer A pressing device for pressing the surface of a rolling roll. 7. An on-line roll grinding device is provided on a stand of a rolling mill and has a grindstone device for grinding a rotating roll, and a moving device for transferring the grindstone device along an axial direction of the roll. In the rolling mill, the grinding device is a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer of cubic boron nitride abrasive grains or diamond abrasive grains provided on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and And a pressing device that presses the thin disk-shaped support member together with the abrasive layer to a rolling roll, wherein the thin disk-shaped support member has a function of the flexible elastic body of 1000 kgf / mm or more. Rolling mill equipped with an on-line roll grinding apparatus characterized by having a spring constant of 0 kgf / mm. 8. An on-line roll grinding device which is provided on a stand of a rolling mill and has a grinding device for grinding a rotating rolling roll and a moving device for transferring the grinding device along an axial direction of the rolling roll. In the rolling mill, the grinding device is a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer of cubic boron nitride abrasive grains or diamond abrasive grains provided on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and And a pressing device for pressing the thin disk-shaped support member together with the abrasive layer to a rolling roll, wherein the thin disk-shaped support member has a function of the flexible elastic body of 500 kgf / mm to 5 kgf / mm. Rolling mill equipped with an on-line roll grinding apparatus characterized by having the spring constant of kgf / mm. 9. An on-line roll grinding device, which is provided facing a rolling roll and has a grinding device for grinding the rotating rolling roll, and a moving device for transferring the grinding device along the axial direction of the rolling roll. In the rolling mill provided, the grinding wheel device, a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll. The online roll grinding device, the load detection means for detecting the contact force between the grinding wheel layer and the rolling roll, and the contact force detected by the load detection means to a desired value An on-line roll grinding device, comprising: a control unit that controls the pressing device to adjust the amount of grinding of the rolling roll by the abrasive layer, thereby grinding the rolling roll to a predetermined roll profile. Rolling mill. 10. An on-line roll grinding apparatus having a grindstone device arranged to face a rolling roll and grinding a rotating rolling roll, and a moving device for transferring the grinding wheel device along an axial direction of the rolling roll. In the rolling mill provided, the grinding wheel device, a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the rolling disk together with the thin disk-shaped support member and the abrasive layer. The online roll grinding device comprises: a load detection unit configured to detect a load of the driving device when the thin disk-shaped support member is driven and rotated; and the load detection unit. It detected load by controlling the pressing device to a desired value by adjusting the amount of grinding mill roll by the abrasive grain layer,
And a control means for grinding the rolling roll into a predetermined roll profile. 11. A rolling mill provided with an on-line roll grinding device according to claim 1, wherein said pressing device converts a rotation of said rotation driving source into a movement in the direction of a rotation axis and said thin disk. A rolling mill provided with an online roll grinding device, characterized by having a ball screw mechanism or a gear mechanism with a small backlash for moving the support member in the form of a roll with respect to a rolling roll. 12. A rolling mill equipped with an on-line roll grinding device according to claim 1, wherein each of said thin disk-shaped support member and abrasive layer for one rolling roll, a driving device, a pressing device, and a moving device. The grinding unit is further arranged such that a contact line between the abrasive layer and the rolling roll is formed in the roll axis direction on the roll end side from the rotation center of the support member in the roll axis direction. Each of the thin disk-shaped support members is arranged so that the rotation axis when rotated by the driving device is inclined so as to be opposite to a direction orthogonal to the axis of the rolling roll. A rolling mill equipped with a featured online roll grinding device. 13. An on-line roll grinder having a grinding device arranged to face a pair of rolling rolls for grinding a rotating rolling roll, and a moving device for transferring the grinding wheel device along an axial direction of the rolling roll. In a rolling mill provided with a device, the grinding wheel device is a thin disk-shaped support having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll A member, an abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and a rolling roll for rolling the thin disk-shaped support member together with the abrasive layer And a pressing device for pressing the roll profile meter, wherein the online roll grinding device includes a roll profile meter that detects a profile of a rolling roll online. The thin disc-shaped supporting
Contact between the abrasive layer formed on the surface of the holding member and the rolling roll
Load detecting means for detecting a force;
Movement that detects the amount of movement of the moving device that moves in the axial direction of the
Contact detected by the amount detecting means and the load detecting means
Calculate the amount of deflection of the thin disk-shaped support member based on the force
In addition, the calculation of the amount of bending is performed by the movement amount detecting means.
Axial direction of the roll based on the amount of movement detected by
At multiple points along the
Calculation device for calculating the roll profile of the rolling roll
And a rolling mill provided with an online roll grinding device. 14. A roll disposed facing a pair of rolling rolls,
Whetstone device for grinding rolling rolls during rolling, and this whetstone device
And a moving device for transferring the rolls along the axial direction of the rolling rolls.
Rolling mill with online roll grinding equipment
The grinding device is pressed against the rolling roll.
Flexible enough to locally bend the contact area with the rolling roll
A thin disk-shaped support member having an elastic body functions, the thin
An abrasive layer formed on the surface of a disk-shaped support member;
A driving device for rotationally driving a disk-shaped support member;
Pressing a disk-shaped support member together with an abrasive layer onto a rolling roll
And a pressing device that performs rolling.
Role profile mail to detect emails online
A roll profile meter , and the roll profile meter supports the thin disk-shaped support.
Contact between the abrasive layer formed on the surface of the holding member and the rolling roll
Load detecting means for detecting a force, and the thin disk-shaped support portion
Detecting means for detecting the position of the material with respect to the rolling roll
Moving the grinding wheel device in the axial direction of the rolling roll
A moving amount detecting means for detecting a moving amount of the device, the load test
So that the contact force detected by the ejection means is constant.
Controlling the pressure device and the position by the position detecting means.
Is detected by the moving amount detected by the moving amount detecting means.
At multiple locations along the axial direction of the rolling roll based on
Based on these positions,
And a calculation device for calculating the lofil.
Rolling mill with online roll grinding equipment. 15. An on-line roll grinder having a grindstone device arranged to face a pair of rolls and grinding a rotating roll, and a moving device for transferring the grindstone device along the axial direction of the rolls. In a rolling mill provided with a device, the grinding wheel device is a thin disk-shaped support having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll A member, an abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and a rolling roll for rolling the thin disk-shaped support member together with the abrasive layer The online roll grinding device is provided with a roll profile meter for detecting the profile of the rolling roll online. The deviation between the profile of the rolling roll detected by the roller and the preset target roll profile of the rolling roll is determined, and at least one of the pressing device and the moving device is controlled based on the deviation to control the rolling roll by the abrasive layer. A rolling mill provided with an online roll grinding device, comprising a control means for adjusting a grinding amount and thereby grinding a rolling roll so as to match the target roll profile. 16. An on-line roll grinder having a grindstone device arranged to face a pair of rolls and grinding a rotating roll, and a moving device for transferring the grindstone device along the axial direction of the rolls. In a rolling mill provided with a device, the grinding wheel device is a thin disk-shaped support having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll A member, an abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and a rolling roll for rolling the thin disk-shaped support member together with the abrasive layer The online roll grinding device includes a roll profile meter that detects the profile of the rolling roll online, and further applies a bender force to the rolling roll. Roll bender means, roll shift means for shifting the rolls in the axial direction, and roll cross means for crossing the pair of rolls with each other, and a roll roll profile detected by the roll profile meter. Control means for controlling at least one of a bender force of the roll bender means, a shift position by the roll shift means, and a cross angle by the roll cross means so that the rolled material approaches the target plate crown. Rolling mill with online roll grinding equipment. 17. A rolling mill provided with an on-line roll grinding device according to claim 15 or 16 , wherein the roll profile meter is provided between an abrasive layer formed on the surface of the thin disk-shaped support member and a rolling roll. Load detecting means for detecting a contact force, and a moving amount detecting means for detecting a moving amount of a moving device for transferring the grindstone device in the axial direction of a rolling roll,
The bending amount of the thin disk-shaped support member is calculated based on the contact force detected by the load detection means ,
Is calculated at a plurality of locations along the axial direction of the rolling roll based on the moving amount detected by the moving amount detecting means, and the roll profile of the rolling roll is calculated based on these bending amounts. A rolling mill provided with an online roll grinding device, comprising a calculation device. 18. A rolling mill provided with an on-line roll grinding device according to claim 15 or 16 , wherein the roll profile meter is provided between an abrasive layer formed on the surface of the thin disk-shaped support member and a rolling roll. Load detecting means for detecting a contact force, position detecting means for detecting a position of the thin disk-shaped support member with respect to the rolling roll, and detecting a movement amount of a moving device for moving the grinding device in the axial direction of the rolling roll. A moving amount detecting unit, and controlling the pressing device so that the contact force detected by the load detecting unit is constant, and detecting the position by the position detecting unit by the moving amount detected by the moving amount detecting unit. performed at a plurality of locations along the axial direction of the rolling roll based on, Bei a computing device for calculating the roll profile of the mill roll on the basis of these positions Rolling mill equipped with an on-line roll grinding system, characterized by that. 19. An on-line roll grinding device having a grindstone device arranged to face a rolling roll and grinding the rotating rolling roll, and a moving device for transferring the grinding wheel device along the axial direction of the rolling roll. In the rolling mill provided, the grinding wheel device, a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll. The online roll grinding device includes a roll inclination detecting device that detects the inclination of the axis of the rolling roll, and a rolling roll based on the detected value of the inclination of the axis of the rolling roll. Along with calculating the target roll profile for the inclination of the axis, the pressing device and the moving device are respectively controlled so that the abrasive layer moves on the target roll profile. And a control means for grinding to a desired roll profile. 20. An on-line roll grinding device having a grinding device arranged to face a rolling roll and grinding the rotating rolling roll, and a moving device for transferring the grinding device along the axial direction of the rolling roll. In the rolling mill provided, the grinding wheel device, a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll. The online roll grinding device is provided on at least one end of the rolling roll, a reference small diameter portion having a smaller diameter than the grinding portion of the rolling roll and a known roll diameter, and the grinding wheel mounting device. Distance detection means for detecting the distance from the rolling roll, and the abrasive layer so that the contact force between the abrasive layer and the rolling roll at the respective positions of the reference small diameter portion and the grinding portion of the rolling roll is the same. The pressing device is pressed against a rolling roll, and the step between the reference small-diameter portion and the grinding portion is obtained from the difference in the distance detected by the distance detecting means at that time, and the step and the known roll diameter of the reference small-diameter portion are determined. A rolling mill provided with an online roll grinding device, further comprising a roll diameter calculating means for determining a roll diameter of the grinding unit. 21. A rolling method for a rolling mill provided with an on-line roll grinding device having a grinding device for grinding a rolling roll and a moving device for transferring the grinding device along the axial direction of the rolling roll. A thin disk-shaped support member having a flexible elastic body function in which a grain layer is formed and a contact portion with the rolling roll is locally bent while being pressed against the rolling roll is provided in the grinding wheel device. , the thin disc-shaped support member rotating drives, the rotation to have thin disc-shaped support member is pressed against the mill roll, thin disc-shaped support member in a pressed state in the rolling roll Is transferred along the axial direction of the rolling roll, the surface shape of the rolling roll rotating while vibrating is ground to a desired contour shape, and rolling is performed by the ground rolling roll. A rolling method for a rolling mill provided with an online roll grinding device. 22. An on-line roll grinding device having a grindstone device arranged to face a rolling roll and grinding a rotating rolling roll, and a moving device for transferring the grindstone device along the axial direction of the rolling roll. In the rolling mill provided, the grinding wheel device, a thin disk-shaped support member having a flexible elastic body function enough to locally bend the contact portion with the rolling roll in a state pressed against the rolling roll, An abrasive layer formed on the surface of the thin disk-shaped support member, a driving device for rotating and driving the thin disk-shaped support member, and pressing the thin disk-shaped support member together with the abrasive layer against a rolling roll. and a pressing device for the online roll grinding apparatus further comprises a roll profile meter for detecting the profile of the rolling rolls online, the roll profile meter, Abrasive grain layer formed on the surface of serial thin disc-shaped support member
Load detecting means for detecting a contact force between the rolling rolls, and a moving device for transferring the grinding wheel device in the axial direction of the rolling rolls
A moving amount detecting means for detecting a moving amount of the moving object;
Calculate the amount of bending of the thin disk-shaped support member and
Calculation of the amount of deflection of
Multiple points along the axial direction of the rolling roll based on the
In place, and based on the amount of deflection,
Profile calculation means for calculating the roll profile
And calculating a deviation between the profile of the rolling roll measured by the off-line profile meter and the profile of the same rolling roll obtained by the profile calculating means, and calculating the deviation from the deviation in a direction parallel to the rolling roll in the moving direction of the rotary grindstone by the moving device. And a means for determining a roll error and correcting the roll profile determined by the profile calculation means based on the parallelism error. 23. A rotating roll, arranged facing a mill roll.
Grinding wheel device for grinding rolling rolls and rolling this grindstone device
A moving device for transferring the roll along the axial direction of the roll.
In a rolling mill provided with an online roll grinding device, the whetstone device is pressed against the rolling roll.
Flexible enough to locally bend the contact area with the rolling roll
A thin disk-shaped support member having an elastic body functions, the thin
An abrasive layer formed on the surface of a disk-shaped support member;
A driving device for rotationally driving a disk-shaped support member;
Pressing a disk-shaped support member together with an abrasive layer onto a rolling roll
And a pressing device that performs rolling.
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The roll profile meter further includes an abrasive layer formed on a surface of the thin disk-shaped support member.
Load detecting means for detecting the contact force between the rolling rolls, the position of the thin disk-shaped support member with respect to the rolling rolls
Position detecting means for detecting, and a moving device for transferring the grinding wheel device in the axial direction of a rolling roll
And the contact force detected by the load detecting means is constant.
Controlling the pressing device and the position detecting means.
Is detected by the movement amount detecting means.
Based on the amount of movement
Location, and based on these positions,
Profile calculation means for calculating the roll profile
And the rolling roll measured by the offline profile meter
The same was determined by profile and the flop Rofiru calculating means
Calculate the deviation from the rolling roll profile and calculate the deviation
From the moving device to the rolling direction of the rotating whetstone
Find the parallelism error for the roll and calculate the
The roll profile obtained by the profile calculation means
Means for compensating the rule
A rolling mill equipped with an in-roll grinding device.