JP3483866B2 - Online rolling roll grinding method and apparatus and rolling mill train - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a cutting method and apparatus, and a rolling mill train,
Suitable for grinding steel to the optimum shape and surface texture for rolling
Online rolling roll grinding method and apparatus and online
The present invention relates to a rolling mill train provided with an in-roll mill. [0002] 2. Description of the Related Art Generally, rolling rolls of a plate rolling mill are made of slab material.
When rolling, only the rolled part wears and the step with the non-rolled part
There will be a difference. For this reason, from a wide slab to a narrow slab
There are restrictions on rolling, such as rolling the slabs in order.
Was. Many online roll grinding to solve this problem
Methods and apparatus have been proposed. For example, Japanese Patent Application Laid-Open No. 5-104115
"Roll lab in online roll grinder
Cutting method '' is equipped with a roll profile calculation device,
Roll profile measured in line and target
Calculate the difference from the roll profile and calculate the roll axis from this difference.
Determine the pressing position of the grindstone for each oscillation in the
A grinding method that changes the cutting position has been proposed
(Hereinafter, referred to as a first conventional technique). [0004] In addition, Japanese Patent Publication No. 3-73364, "Rolling"
In the "roll grinding method", the material is arranged along the axis of the rolling roll.
Using a plurality of ground bodies, the rolling part of the rolled material (rolling part)
Grind to the extent that skin on the roll surface can be removed,
The step with the part is larger than the passing force of the grinding body
(Hereinafter referred to as a second conventional technique).
Art). [0005] SUMMARY OF THE INVENTION
Conventional technologies have the following problems. [0006] The rolling roll of the plate rolling mill rolls the slab material.
Then, only the rolled part wears and a step with the non-rolled part occurs
At this time, if slab material of the same width is rolled,
The position corresponding to the end of the rolled material is
The amount of wear increases, causing a local wear step. Because of this,
This is transferred to the rolled material, and the end of the rolled material is thicker than the other parts.
Thick edge build-up occurs, resulting in uneven plate thickness. [0007] In the first prior art, the friction of the rolling roll is reduced.
Measure worn roll profiles online and check
If there is a difference from the fixed role profile, the difference is large or small
Of grinding body against rolling roll by grinding
The position to not be cut is calculated and determined, and grinding is performed. This way
According to the local wear step causing edge build-up
The difference can be removed by grinding.
There is a part that has been ground and a part that has not been ground.
The surface becomes uneven in roughness, and good surface properties cannot be obtained. [0008] In the second prior art, the passing plate portion is rough.
Grinding force to remove
Can remove the local wear step of the rolling roll
Absent. For this reason, local wear steps remain on the rolling rolls,
Edge bull-up itself cannot be prevented.
No. In addition, in this conventional technique, along the axis of the rolling roll,
Grinding using multiple grinding bodies
The grinding position of the grinding body overlaps on the roll surface
Lap marks are generated and good roll surface properties are obtained.
I can't. By the way, as described above, the grinding of the rolling roll
In this case, the surface roughness of the roll becomes uneven,
If the surface properties deteriorate due to marks, etc., they
Transferred to the material, affecting the surface quality of the rolled material. In particular,
A series of continuous hot rolling mills where the rolled sheet material becomes a product as it is
At the final stand or temper rolling mill,
When the surface texture is transferred to the rolled material surface,
Sawazashi appears, grinding marks and lap marks on multiple grinding wheels
It will affect the surface quality of the rolled material
There is a strong demand for grinding while avoiding such grinding conditions.
You. A first object of the present invention is to provide a rolling roll having a surface.
Grinding to good surface properties without roughness and grinding unevenness
Online rolling roll grinding method and apparatus capable of
Of rolling mills with online rolling mills
Is to provide. A second object of the present invention is to provide a continuous hot rolling mill train.
Grinding rolls at the final stand or temper rolling mill
Can roll a rolled material with good surface quality
Roll milling method and apparatus and its online pressure
To provide a rolling mill train equipped with a roll mill.
You. [0012] The first and second objects are as described above.
In order to achieve the above, the grinding method of the present invention
Flat or cup type rotary grinding
A grinding unit having a stone is provided, and the grinding wheel is rotated.
WhileOnly one side of the rotating whetstone is used for the rolling roll.
To make contactPressing on the rolling roll, roll axis direction
To grind the rolling roll by moving to
In the in-roll roll grinding method, the grinding unit
Cubic boron nitride abrasive or diamond
Abrasive grains bonded with resin bondAnnularAbrasive layerOn one side
Having a grain size of 170/20
No. 0FromSelect either 200/230,Said annular
The radial width of the abrasive layer is 30 mm to 50 mm,The laboratory
Milling unit to the final stand or
It is installed in a quality rolling mill to grind a rolling roll. [0013] [0014] Further, the first and second objects are achieved.
Therefore, the grinding device of the present inventionRolling in rolling mill
Has a flat or cup-shaped rotary grindstone for the roll
Provide a grinding unit that rotates the rotating whetstone
Only one side of the rotating whetstone contacts the rolling roll
To the roll and move it in the roll axis direction.
Online rolling to grind the rolling roll by
In a roll grinding device, a rotary grinding wheel of the grinding unit
Cubic boron nitride abrasive grains or diamond abrasive grains
It has an annular abrasive layer bonded on one side with resin bond
The size of the abrasive grains is increased from No. 170/200
No. 200/230, and the annular abrasive layer
The radial width is 30 mm to 50 mm, and the grinding unit
Continuous hot rolling mill row of final stand or temper rolling mill
Installed inThings. [0016] [0017] Further, the first and second objects are achieved.
In order for the rolling mill train of the present invention toRolling in rolling mill
Has a flat or cup-shaped rotary grindstone for the roll
Provide a grinding unit that rotates the rotating whetstone
Only one side of the rotating whetstone contacts the rolling roll
To the roll and move it in the roll axis direction.
Online rolling to grind the rolling roll by
A roll grinding apparatus, wherein the grinding wheel of the grinding unit is
Cubic boron nitride abrasive grains or diamond abrasive grains
It has an annular abrasive layer bonded on one side with resin bond
The size of the abrasive grains is increased from No. 170/200
No. 200/230, and the annular abrasive layer
On-line rolling with a radial width of 30 to 50 mm
Roll grinding equipment installed on the final standThing
You. In the present invention, the abrasive grain layer of the rotary grindstone is cubic
Boron nitride or diamond abrasive with resin bond
Made of bonded material, abrasive size is 170/200
FromBy choosing either 200/230,
Time, it is possible to grind the rolling roll to good surface properties
The final stand and control of the continuous hot rolling mill train
Quality mill attached to online rolling roll grinding equipment
To achieve the required grinding performance and wheel life
Can be. In particular, the rolling stand of the final stand or the temper rolling mill
The surface properties of the tool are the abrasive grains attached to the grinding wheel
Also affected by the size of the abrasive grain
If this is the case, the surface properties of the rolling rolls become better. I
However, the life of the whetstone is too small for the whetstone with a very fine grain size.
Too short, used for actual online rolling roll grinding equipment
Can not. In the present invention, the abrasive layer of the rotary grindstone is
Bond boron carbide or diamond abrasive with resin bond
Made with a combination of abrasive grains of 170/200 size
And either 200/230
Rolling roll can be ground to good surface properties during
The final stand and temper of a continuous hot rolling mill row
Mounted on rolling mill online rolling roll grinding equipment
Achieving the required grinding power and wheel life for rotating wheels
Can be. Further, the rotating grindstone is moved in the roll axis direction.
Even if the speed is increased, the feed mark of the grinding wheel is
It is necessary to avoid remaining. According to the present invention, the rotary grinding wheel of the grinding unit is used.
Cubic boron nitride or diamond abrasive
Using an abrasive grain layer bonded by
The width in the radial direction of the annular abrasive layer is 30 mm to 50 mm
This allows the feed mark to be
Grind to good surface properties without leaving any
Grinding without clogging can be ensured evenly
be able to. As a result, the final stage of the continuous hot rolling mill
For rolling mills and temper rolling mills.
Achieves the grinding ability and wheel life required for the rotating grindstone
Can be achieved. [0024] [0025] Embodiments of the present invention will be described below with reference to the drawings.
You. First, a first embodiment of the present invention will be described with reference to FIGS.
explain. In FIGS. 1 and 2, the pressure according to the present embodiment is shown.
The rolling mill is a pair of rolling rolls for stretching the rolled material S (up and down work
Rolls) 1a, 1a and the rolling rolls 1a, 1a.
Rolling rolls (upper and lower reinforcing rolls) 1b, 1b (one
(Only one is shown). Rolling roll
1a, 1a are held by bearing housings 3, 3, and these bearings
Boxes 3 and 3 are incorporated into the operating and drive side stands 4 and 4.
It is rare. An entry guide 10 is arranged on the entry side of the rolling mill.
Then, the rolling material S is guided to the rolling roll 1a. rolling
Cooler for cooling the heat generated by the rolling rolls 1a, 1a
Header 15 (only one is shown) is provided for rolling
The generated heat of the rolling rolls 1a, 1a is cooled. In such a rolling mill, the on-line
A rolling roll grinding device is provided. Online rolling
A plurality of roll grinding devices are provided on one work roll 1a.
In this embodiment, two grinding units 5 and 5 are provided.
ing. Each grinding unit 5 is shown in FIGS.
Like this, the disk-shaped rotary grinding wheel 2 for grinding the work roll 1a
0, the rotating grindstone 20 is rotated via a grindstone rotating shaft 21.
Grinding wheel driving device 22 and rotating grindstone 20
Grinding wheel feeder 23 that presses the grinding wheel 20
Traverse device 24 for moving in the axial direction of
I have. The rotating grindstone 20 is a thin plate having a boss 52a.
The disk 52 is fixed to the side of the thin disk 52 opposite to the boss.
And a thin disk 52 is provided with a boss 52
The portion a is attached to the grindstone rotating shaft 21. Also,
The thin disk 52 is used to absorb vibrations from the rolling rolls.
It has a function of an elastic body, and has a rolling roll 1a and an abrasive layer 51.
The amount of deflection changes according to the contact force between them. The abrasive layer 51 is made of cubic boron nitride which is superabrasive.
Abrasive (commonly called CBN) or diamond
Made using a resin bond as a binder
Have been. The material of the thin disk 52 is the super
The purpose of easily dissipating the grinding heat from the abrasive grains and the mass of the movable part
Made of aluminum material or aluminum alloy for the purpose of reducing
Have been. As shown in FIG. 3, the grindstone rotating shaft 21 rotates
Bring only one side of the grinding wheel 20 into contact with the rolling roll 1
Therefore, with respect to a line perpendicular to the axis of the rolling roll 1a, 0.5
It is installed at a slight angle of about ° to 1.0 °. this
The contact line between the abrasive layer 51 and the work roll 1a
It is formed only on one side when viewed from the center, and the thin disk 52 is
The elastic body function can be exhibited effectively. As shown in FIG. 3, the grindstone driving device 22
The rotary grindstone 20 is rotationally driven so as to have a predetermined grindstone peripheral speed.
A hydraulic motor 54 (which may be an electric motor) and a liquid motor
54 that transmits the rotation of the output shaft 54a of the
And the output shaft 5
4a and the pulley shaft 54b are parallel splines 54c.
Are connected via Pulley shaft 54b is
-59 so as to be rotatable. The grinding wheel rotating shaft 21
Body through slide type radial bearings 21a and 21b
-59 supported rotatably and movably in the axial direction
ing. The rotating wheel 2 is provided on the opposite side of the rotating wheel 21 of the wheel rotating shaft 21.
Load cell 53 for measuring the contact force between work 0 and work roll 1a
Is arranged. The body 59 is stored in the case 25
The hydraulic motor 54 is attached to the case 25.
You. In addition, as shown in FIG.
5 rotates at the bottom of the wheel 5 via a slide bearing 25a
It is mounted movably in the axial direction of the shaft 21. [0033] As shown in FIG.
A feed motor 57 attached to the case 25 and a feed motor
Of body 59 by the rotation of motor 57
The grinding wheel 20, the grinding wheel rotation shaft 21 and the row
Backlash rester to feed the dossels 53 back and forth together
Ip preload ball screw 56 and rotation of feed motor 57
And an encoder 57a for detecting an angle. Preload
Backlashless type instead of ball screw 56
May be used. The traverse device 24 is provided as shown in FIG.
The traverse motor 58 attached to the case 25
And mounted on the rotating shaft of the traverse motor 58,
14 and a pinion 58a that meshes with
Attached to engage a pair of guide rails 7a, 7b
And two pairs of guide rollers 26 (see FIG. 2)
An encoder 58b for detecting the number of rotations of the motor 58;
are doing. The guide rails 7a and 7b are as shown in FIG.
At the entry side of the roll 1a along the axis of the roll 1a.
Is attached to the rail frame 7
You. The rack 14 is located on the side opposite to the rolling roll of the guide rail 7a.
It is formed on the side. Thus, the grinding unit 5
Via the guide roller 26 and the guide rails 7a, 7b
Traverse motor supported by rail frame 7
Rotation of the pinion 58 and the engagement of the pinion 58a and the rack 14
It can move smoothly in the roll axis direction. The roll grinding unit 5 includes a rolling roll 1a
Must not interfere with the bearing box 3 on the operation side when replacing
It is necessary. For this reason, both ends of the rail frame 7 are
Slides on the guide 9 attached to the stand 4 as shown in
And the grinding unit 5 is mounted on the rail frame 7
The operation side and drive side rails respectively provided near both ends
Rail moving device 30 (see FIG. 1)
It is possible to move the rolling roll 1a together in the contact / separation direction.
ing. The tip of each rail moving device 30 is a rail frame.
A hydraulic cylinder 11 pin-connected to the system 7 is provided. The feed motor 57 of the grinding wheel feeder 22 and the
The traverse motor 58 of the traverse device 24 is shown in FIG.
Is controlled by the control device 13a. Wheel drive
The hydraulic motor 54 is supplied from the hydraulic circuit 13c.
Driven by fluid, the hydraulic circuit 13c is also
Is controlled by Also, load cell 53, whetstone feeding device
The encoder 57a of the device 23 and the
The detection signal of the encoder 58b is sent to the information processing device 13b.
The result is sent to the control device 13a. In this embodiment constructed as described above, the rotation
The grindstone 20 is actively driven at a high speed by the grindstone driving device 22.
To increase grinding performance and grinding wheel life for long grinding
be able to. Also, in this embodiment, Japanese Patent Application Laid-Open No. 6-476
No. 54, the rotating grindstone 20 is a roll
Easily absorbs the vibrations
It is possible to grind correctly for a long time
It is effective to further extend the life of the grinding wheel. In other words, the rolling roll 1a is not limited to the rolling speed.
Vibration while having a frequency of 10 to 150 C / S depending on
are doing. Conventional off-line grinding as an online grinding device
Roll grinder with cylindrical grinding wheel common in grinding equipment
When the wheel is attached, the cylindrical grinding wheel and rolling roll
The metal on the roll surface contacts the abrasive grains
Start to grind while squeezing. When the abrasive grains come into contact with the metal on the roll surface
The rolling roll is ground and the next instant whetstone is
The detached grains rotate through the sky. Such discontinuous grinding
This may cause chattering phenomena.
And a cross section. The grinding wheel is subjected to the same vibration as that of the rolling roll.
In this case, no change occurs in the contact force between the grinding wheel and the rolling roll. I
Scratch the whole grinding wheel and grinding wheel frame with the rolling roll
The roll vibration is 150 c / s.
It is difficult to follow because of the high frequency. Grinding wheel of roll vibration
Elastic body on the grindstone itself without trying to escape with the whole grindstone frame
If you have a function and absorb the vibration with the deflection of the grindstone,
Immediately following the vibration of the rolling rolls
Therefore, the fluctuation of the contact force between the grinding wheel and the rolling roll is small.
You. In this embodiment, it is a part of the rotary grindstone 20.
By making the thin disk 52 have an elastic body function,
The rotating grindstone 20 is provided with an elastic body function.
Circumferential speed is 1000m / min to 1600m / mi on the outer circumference
n while rotating so as to reach n.
Press and bend. The rolling roll 1a is moved back and forth as described above.
Is oscillating. Due to this vibration, the rotating grindstone 20 is pressed.
However, at this time, the thin disk 52 bends and the rolling roll 1a
Instantly absorbs vibrations from Thereby, the abrasive layer 51
Of the contact force between the sheet and the rolling roll 1a is caused by the bending of the thin disk 52.
The elastic force generated by the
Can be combed. In this embodiment, the elasticity of the thin disk 52
As shown in Fig. 3, in order to make the body function effective
The contact position between the grain layer 51 and the rolling roll 1a is from the center of the grinding wheel.
Tilt the grindstone rotating shaft 21 so that it is formed only on one side
ing. In this way, pressing against the rolling roll 1a
The thin disk 52 is bent in the form of a cantilever by the force of
The vibration from 1a can be easily absorbed. In this embodiment, the abrasive layer 51 is supported.
The thin disk 52 which is a base metal has an elastic body function.
The mass movable by the vibration from the rolling roll is the abrasive layer 51.
And the thin disk 52 only, and less in the abrasive layer 51
Grinding ratio (longer work volume reduction)
/ Super abrasive grains (cubic boron nitride abrasive grains with high grinding wheel reduction volume)
Is a diamond abrasive), so the mass of the movable part
Becomes very small, and the natural frequency of the rotary grindstone 20 becomes high.
Become. For this reason, the vibrating rolling roll is vibrated by resonance.
Grinding correctly for a long time without causing re-phenomenon
You. Next, the grinding method of this embodiment will be described with reference to FIGS.
It will be described using FIG. FIG. 5 shows the roll profile measured online.
Indicates a wheel. As shown in this figure, the rolling roll
Causes a step due to wear in the rolling part (thread passing part) and the non-rolling part
When rolling steel plates of the same width continuously,
The part at the end wears more than the other part of the rolled part.
You. Generally, the rolling section does not have a thermal crown.
It wears evenly. FIG. 6 shows a roll obtained by rolling a rolled material having the same width.
7 shows another example of the rule profile. This example is offline
The roll profile measured in
Has disappeared. In the figure, the broken line indicates the measured roll profile.
And the solid line is the theoretical (calculated) roll profile.
It is. As can be seen from this figure, rolled material of the same width
(Steel sheet) If rolling 20 or more of S continuously
A wear step a occurs between the extending portions. Also, steel sheets of the same width
When the continuous rolling is performed, the portion corresponding to the rolled material end Se becomes another threading plate.
A predetermined length c from the end Se of the rolled material S
Is locally worn on the step b. This local wear is
The plate edge of the rolled material cools quickly and becomes harder than other parts
And the length c
Varies depending on the plate thickness, plate material, etc.
According to the discussion, it is generally in the range of 20mm to 50mm.
You. The inside of the portion having the length c is worn almost uniformly. Role profile measured online
Is schematically shown in FIG. In the figure, A is the rolling roll 1a.
The position of the end portion B is smaller than that of the plate end portion Se of the rolled material S due to local wear.
The position inside by length c, C is the roll of rolling roll 1a
The central position in the axial direction, D is the position of the plate end Se of the rolled material S.
Shown respectively. In the grinding method of the present embodiment, first,
To remove the abrasion step a and the local abrasion step b.
A-D outside the portion corresponding to the end Se of the rolled material S plate
Target profile and measured roll profile
The required grinding amount is calculated from the difference between the required grinding amount and the required grinding amount.
The contact force between the rolling roll 1a and the rotary grindstone 20 is calculated from the
This is used as the set contact force for grinding. Part of local wear length c
Minute, that is, the range of D-B also has a large shape change due to wear.
Therefore, the target roll profile and the measured roll profile
Rolling roll 1a and rotating grindstone 20
Grinding by controlling the contact force. On the other hand, the inner side of the portion of the local wear length c
In the range of BB, an almost constant tune with a thermal crown
Roll profile with roll ratio
1a and the grinding wheel with constant contact force without changing the contact force
Shave. The contact force when grinding as described above
The changes are shown in FIG. Set the grinding range of the rolling roll 1a
Of a predetermined length including the local wear length c from both ends of
The first position on the outer side in the roll axis direction with respect to the position B in the roller axis direction.
Range AB and a second range BB inside the roll axis direction.
And in the first range AB, the target roll profile
Roll 1a due to the difference between the measured roll profile and
Grinding by controlling the contact force between the grinding wheel 20 and the second range
In BB, the contact force between the rolling roll 1a and the rotating grindstone 20 is one.
Grind by controlling to be constant. Constant second range
Rolling part has uneven surface roughness by grinding with contact force
Grinded to good surface properties without any. Here, a portion of the rolled portion that is worn almost uniformly.
The grinding capability of the second range BB is the end S of the rolled material S.
e: Removal of the local wear step b (see FIG. 6)
is necessary. That is, generally, the end Se of the rolled material S
Is the local wear step b generated by the rolling process of one coil roll 0.3?
0.6 μmm. Grinding that can remove this step
Control to be an ability. The grinding ability is the same as that of the rolling roll 1a.
Contact force of rotating grindstone 20 (pressing force of rotating grindstone 20), rotation
Axial moving speed of the rolling roll 1a of the grinding wheel 20 (traversing speed)
Speed) or the number of rotations of the rotary grindstone 20.
Therefore, the constant contact force in the second range BB is
Grinding that can remove the local wear step b generated at the end of the rolled material
Set to be an ability. The grinding of the rolling roll 1a as described above is performed.
With this, without changing the shape of the thermal crown,
Flatten the steps of the roll profile caused by wear.
Can be The rolling roll grinding apparatus of the present embodiment is
The control procedure is shown in FIG.
Shown in a row chart. These control procedures are performed by the information processing device 1
3b is stored in advance as a program. First, the rotary grinding of the two grinding units 5 and 5
While pressing the stone 20 against the work roll 1a, in the roll axis direction
And measure the profile of the entire length of the roll.
Step 100). Run with this online grinding machine
The method of measuring roll profile is described in JP-A-6-4765.
No. 4 publication can be used.
This will be described later. Next, target role profile and actual measurement
From the difference between the roll profile and the required grinding amount between AB
The rolling roll 1a and the rotating grindstone 2
Calculate a contact force of 0 and set this as the set contact force (step
101). The target roll profile and B position are
Stored in the information processing device 13b. Then two labs
Pressing the grinding wheel 20 of the grinding units 5 and 5 against the work roll 1a
Move in the roll axis direction while grinding to start grinding
(Step 102). At this time, the information processing device 13b
The detection signal of the encoder 58b of the traverse motor 58
The grinding position in the roll axis direction is always recognized from the
103), load when grinding position is between AB
Roll 1a and rotating grindstone 2 measured by cell 53
The contact force with the contact force with 0 calculated and set as described above
Of the feed motor 57 of the grinding wheel feeder 23
The amount is controlled (step 104). When the grinding position is B
When the pressure is between -C, the contact force measured by the load cell 53
So that the grinding wheel feeder 23 has a constant contact force.
The feed amount of the motor 57 is controlled (step 105). That
The constant contact force is also stored in advance in the information processing device 13b.
You. Counts the number of grindings when grinding of the entire roll length is completed
(Steps 106 and 107), and the number of grinding
It is determined whether or not it has reached (step 108). Designated laboratory
The number of times of cutting is, for example, 5 to 6 times.
It is stored in the processing device 13b. Number of grinding times
If not, return to step 102 and repeat the above steps
Repeat steps 103-108 until the specified number of times is reached
Return to step 100 and measure the roll profile again
Then, the processing of steps 101 to 108 is repeated.
The above roll grinding is continuously performed during rolling. Roll profile in step 100
An example of the processing procedure of the cell measurement will be described with reference to FIG. This
Is also stored in the information processing device 13b as a program.
Has been delivered. First, the rotating grindstone of one grinding unit 5
20 is pressed against the operation side end of the work roll 1a (step
300). Next, the traverse motor 58 is rotated to
The cutting unit 5a is moved in the roll axis direction (step 3
01). During this movement, the load cell 53 and the abrasive layer 51
Measure the contact force with the work roll 1a, and the contact force is constant
The feed position is controlled by the feed motor 57 so that
From the encoder 57a of the feed motor 57
The feed amount of the rotary grindstone 20 is calculated by the signal
303). At the same time, the traverse motor 58
Of the grinding unit 5a by a signal from the encoder 58b.
The position in the rule axis direction is measured (step 304). Soshi
Roll from the position in the roll axis direction and the feed amount of the rotating grindstone.
A profile is calculated (step 305). The other laboratory
Carry out the same procedure for the grinding unit 5
A lofil is calculated (step 306). However,
The movement in the axis direction is performed from the drive side end. Two grinding
Roll profile obtained by moving units 5 and 5
And determine the profile of the entire length of the work roll 1a
(Step 307). With the above, online grinding equipment
Roll profile online
Can be measured. It should be noted that the low-
Japanese Patent Application Laid-Open No. 6-47
No. 654, the feed position is fixed and the contact force
May be a method of measuring a change in In addition, a dedicated
Install a line profile meter and use the detected value
You may. As described above, according to the present embodiment, the edge building
It does not leave local wear steps that cause
The best roll for rolling without changing the shape of the le crown
Grinding rolls for profile and surface texture
Can be. The last stand of the continuous hot rolling mill train,
The temper rolling mill uses an online rolling roll grinding device.
Roll profile and surface properties of the milled roll
The uniformity of the thickness of the rolled material, the gloss of the rolled material surface and
Surface roughness is greatly affected. Online of this embodiment
Rolling roll grinding equipment for continuous hot rolling mill row final stand
By grinding the rolling rolls installed in the temper rolling mill,
Manufacture rolled material with uniform thickness and good surface quality
be able to. A second embodiment of the present invention will be described with reference to FIG.
I do. In the first embodiment, the end Se of the rolled material S is
From the position B in the roll axis direction inside the
Grind with constant contact force in the second range BC on the side
Therefore, in the range of BC, the same shape as the worn shape
Is ground. Therefore, this method has a range of BC
This is a convenient method when the wear is uniform on the left and right. I
However, it does not wear uniformly in the range of B-C,
If worn, have a symmetrical roll profile
Grinding in this range, so even in this range
Set the target profile and the actual role profile.
Roll with roll 1a based on the difference from roll profile
It is necessary to change the contact force of the whetstone 20 depending on the location
is there. However, even in this case, the rolling roll 1a and the rotating grindstone
If the difference between the contact forces of
In the case of a rolled part, the surface properties of the rolling roll 1a vary depending on the location.
However, this may transfer to the rolled material S and deteriorate the surface quality.
There is. In the grinding method of this embodiment, the target roll
The difference between the feel and the measured roll profile is the same.
Even the range of AB at the roll end and the range of BC at the rolled section
Then, the contact force between the rolling roll 1a and the rotary grindstone 20 is calculated.
By changing the gain, the end of the roll is
The difference in tactile force and the difference in the rolling contact
To do. Reduce the gain for calculating the contact force of the rolling section
This causes errors in the measured roll profile.
Roll profile error due to grinding
Small changes in roll surface properties at the rolling section
To produce rolled material with good surface quality
Can be. FIG. 11 shows a method for carrying out the above grinding method.
Flow chart shows the control procedure of the roll mill
You. First, as in the first embodiment, two grinding tools are used.
The rotating grindstone 20 of the knits 5, 5 is pressed against the work roll 1a.
While moving in the roll axis direction,
The wheel is measured (step 500). Next, target low
A from the difference between the roll profile and the actual roll profile
The required grinding amount between -B and B- is calculated, and this required grinding amount
Roll profile is the same between B and C than between A and B
Contact force so that the change in contact force with respect to
The contact force is calculated by changing the constant gain G, and is calculated as the set contact force.
(Step 501). That is, the target role pro
The feel is Z (x) and the measured roll profile is Z '
(X), the contact force conversion constant is K, and the gains are G1 and G2.
Then, between AB,           P (x) = KG1 {Z (x) -Z '(x)} (1) To calculate the contact force P (x), and between B and C,           P (x) = KG2 {Z (x) -Z '(x)} (2) Is used to calculate the contact force P (x). Here, ｛Z (x) −
Z ′ (x)｝ is the target roll profile and the measured roll profile.
The difference from the lofil, that is, the required grinding amount, and the gain
G1 and G2 are in a relationship of G1> G2. G1 as an example
= 1, G2 = 0.5. Equation (1) above and
(2) is information in advance together with the positions of the gains G1, G2, and B.
It is stored in the processing device 13b. Next, the rotary grinding of the two grinding units 5 and 5
While pressing the stone 20 against the work roll 1a, in the roll axis direction
To start grinding (step 502). this
At this time, the information processing device 13b
Grinding position in the roll axis direction from the detection signal of the encoder 58b
Is always recognized, and when the grinding position is between AB
Is the number of turns with the rolling roll 1a measured by the load cell 53.
The contact force with the grinding wheel 20 is calculated and set by the above equation (1).
Feed mode of the grindstone feeder 23 so that the contact force
When the grinding position is between B and C
The contact force measured by the load cell 53
Grinding wheel feeder 2 so as to have the contact force calculated in (2)
In step 50, the feed amount of the feed motor 57 is controlled.
3). When the grinding of the entire roll length is completed, the number of grindings is counted.
(Steps 504 and 505) and the number of grindings is specified
Is determined (step 506). Designation
The number of times of grinding is, for example, 5 to 6 times.
It is stored in the information processing device 13b. Number of grinding times is specified
If not, return to step 502 and repeat the above steps.
Steps 503 to 506 are repeated until the specified number of times is reached.
Return to step 500 and measure the roll profile again.
And repeat the above steps 501 to 506.
You. The above roll grinding is continuously performed during rolling. As described above, according to this embodiment, too,
Without leaving any local wear steps that may cause
The best row for rolling without changing the crown shape
Grind the rolling roll to the profile and surface texture.
Can be. In addition, the last stand of a row of continuous hot rolling mills,
Even if the rolling roll of the temper rolling mill is ground,
Online grinding that maintains good quality is possible. FIGS. 12 to 15 show a third embodiment of the present invention.
A more detailed description will be given. This embodiment is an on-line rolling row of the present invention.
Rolling mill equipped with a grinding machine
It was installed in a stand. In FIG. 12, the continuous hot rolling of the present embodiment
The fleet consisted of six compressors from the first stand to the sixth stand.
The rolling machines 80 to 85 are arranged in tandem,
The online mill of the present invention is installed in the rolling mill 85 of the stand (the sixth stand).
An in-roll roll grinding device is provided. This rolling mill
The roll grinding device is adapted for the upper and lower rolling rolls 1a, 1a.
It has grinding units 5 arranged one by one.
You. Of the rolling roll grinding device including the configuration of the grinding unit 5
In other configurations, the entire length of the rolling roll 1a is reduced to one grinding unit.
The control device 13 is controlled so as to perform grinding with the knit 5.
a and the information processing device 13b (see FIG. 3) function.
Except for this, the third embodiment is the same as the first embodiment. In FIG. 13, the grinding unit 5
As described in the first embodiment, the rotating grindstone 20 is a thin plate.
Disk 52, attached to the side of thin disk 52, cubic
Crystal boron nitride or diamond abrasive with resin bond
And an annular abrasive layer 51 formed by using
The size of the abrasive grains in the abrasive grain layer 51 is 170/2
It is either No. 00 or No. 200/230. Furthermore,
The radial width (grinding wheel width) W of the annular abrasive layer 51 is 30 mm.
５０50 mm. The last stand of the continuous hot rolling mill train is online.
When an in-roll mill is installed,
The surface properties of the roll 1a that has been ground differently are transferred to the rolled material S.
Because the online rolling roll grinding equipment has the grinding capability
Roller 1a surface quality is better maintained
It is desired to do. FIG. 14 shows the difference between the abrasive grain sizes of the grindstones.
The experimental results on the difference in surface roughness are shown below. this
The range of the arrow for each abrasive grain size in the figure is the range of the roll surface roughness
Is shown. FIG. 15 shows the difference in the abrasive grain size of the grinding wheel and the grinding ratio.
(Amount of grinding of workpiece / Abrasion of grinding wheel)
The experimental results are shown below. The range of the arrow for each abrasive grain size is
Indicates the range of cutting ratio. Grinding conditions in these experimental results
Is as follows. Roll (material to be ground): Nickel Glen roll Roll rotation speed: 300 to 600 m / min Wheel speed: 1200m / min Contact force: 300N Wheel traverse speed: 10-20mm / s Up-cut grinding (roll rotation direction and grinding wheel rotation direction
Grinding in reverse state) Whetstone width: 40 mm. According to the study by the present inventors, the final stand
Rolled by online rolling roll grinding equipment
Rolling roll 1a has surface roughness of 0.9μm average roughness Ra
When the surface becomes uneven with a roughness of 1.0 μmm or more,
It is found that the irregularities of the surface are transferred to the rolled material S as grinding lines.
Was. For this reason, in order to avoid this, the rolling roll 1a table
The surface properties should be between 0.9μmm and 1.0μmm
It is necessary to grind to the state of the lower unevenness.
Made of crystalline boron nitride (CBN) or diamond abrasive
The grain size of the abrasive grains of the abrasive layer 51 includes # 170/200
More detail is needed. On the other hand, finer grain size
If this is done, the average roughness of the rolling roll 1a is improved.
As shown in FIG. 5, the wear of the abrasive grains rapidly increases. This is a grind
When the particles become smaller, the binder is resin-bonded and the abrasive particles are supported.
Force is reduced, abrasive grains are easily dropped and the abrasive layer 51
This is because the wear is accelerated. Abrasive grain size is # 230/27
If it becomes finer than 0, the grinding wheel life will be a few days,
Since it is necessary to replace the whetstone, perform rolling to replace the whetstone.
Need to be stopped, the effect of the online roll grinding device
Greatly lost. As described above, the abrasive grain layer 5 in the rotary grindstone 20
The grain size of 1 is 170/200 or 200/230
By the final stand online rolling roll
Grinding ability required for the rotary grinding wheel 20 attached to the grinding device
Power and grinding wheel life can be achieved. According to the study by the present inventors, the pressure
The rotating grindstone moves in the roll axis direction during one rotation of the roll 1a.
The moving distance is equal to the width of the abrasive layer 51, that is, 1 / the width of the grinding wheel W.
When it is 3 or more, the feed mark of the grinding stone is likely to be generated
I understood. For example, roll diameter 700mm, roll rotation
When the speed is 300 m / min, the grinding wheel width W is 20 mm, 3
0mm, 40mm1/3Just move
Of the rotating grindstone 20 in the roll axis direction at the time of
Dynamic speed) Wheel width W20mm Allowable wheel moving speed 15mm / s 30mm22.7mm / s 40mm30mm / s 50mm37.5mm / s 60mm45.4mm / s As the grinding wheel width W increases, the grinding wheel moves without leaving the feed mark.
The moving speed can be increased. On the other hand, the rotary grindstone 20 is used for the abrasive grains of the abrasive layer 51.
And the contact force between the rolling roll 1a and the grinding wheel 20
However, the life of the grindstone differs depending on the grindstone width W. For example, C
Roll roll 1a with # 170/200 whetstone with BN abrasive
Even with grinding, if the grinding stone width is 20 mm, the grinding ratio is 50,
When the stone width is 40 mm, the grinding ratio is 120. In other words, the wheel width
A wider one can increase the whetstone moving speed as described above.
And the grinding ratio is large, so that the same grinding capability is required.
Required, the wider the wheel width, the longer the wheel life
Become. However, if the grinding wheel width W is too large, the annular abrasive layer
The difference in grinding speed between the outer and inner peripheral portions of
It becomes difficult to grind in contact with
Clogging may occur on the inside that is relatively slow. As described above, the grindstone width W is 30 mm to 50 m.
m is good, especially around 40mm is optimal.
Good whilst increasing the moving speed of the grinding wheel without leaving feed marks
In addition to being able to grind the rolling roll 1a to the surface properties,
Longer life and more uniform grinding without clogging
Can be sharpened. At the final stand of the continuous rolling equipment,
Grinding using a rotating whetstone 20 with an abrasive layer 51
By doing, the roll surface is ground to the rolled material S
Transfer of eyes and the like can be prevented. However, one
Using a plurality of rotating grindstones 20 for the rolling roll 1a
After grinding, the rotating grindstone 20 is rubbed on the surface of the rolling roll 1a.
There is a place where you can step up. Roll roll at this wrapped position
The surface properties of 1a are slightly different from others. Real truth
In the embodiment, the above-mentioned final stamp having a severe surface property of the rolled material S is used.
In a rolling mill, one rotation is performed for one rolling roll 1a.
From one end of the rolling roll 1a to the other end with a grinding wheel 20
Grind up to. Rolled material with good surface quality
S can be rolled. In the third embodiment, the surface properties of the rolled material S
Final stand of continuous hot rolling equipment as a severe rolling mill
The present invention is applied to the rolled material S, but the surface properties of the rolled material S are severe.
The present invention can be applied to other rolling mills.
Wear. For example, the present invention is applied to a temper rolling mill (not shown).
The same effect can be obtained by using. Some preferred embodiments of the present invention have been described above.
However, various modifications can be made within the spirit of the present invention.
Noh. For example, in the above embodiment, a thin plate is
It has a flat type grinding wheel with an annular abrasive layer attached to a disk.
However, a cup-shaped grindstone member was attached to the base disc.
The present invention is similarly applied to a cup-type rotating grindstone
Thus, a similar effect can be obtained. [0079] According to the present invention, a mill roll is produced by grinding.
Since the surface can always maintain a rough surface without roughness,
Rolling of same width material by improving wear level and surface roughness
Can be continuously performed without limitation. Also, the final stand and temper of the continuous rolling equipment
Even if the rolling rolls of the rolling mill are ground online,
The surface properties of the tool are transferred to the rolled material surface,
Good surface quality without deterioration of surface quality
Can be manufactured. [0081]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partial sectional side view of a main part of a rolling mill provided with an online rolling roll grinding device according to a first embodiment of the present invention. FIG. 2 is a partial cross-sectional plan view showing a part of the rolling mill shown in FIG. 1 cut away. FIG. 3 is a diagram showing a horizontal sectional view of a grinding unit together with a control device and an information processing device. FIG. 4 is a vertical sectional view of the grinding unit. FIG. 5 is a diagram showing a roll profile measured using an online roll grinding device. (From the Japan Iron and Steel Institute, Nishiyama Memorial Technical Lecture, “Rolling Mill with Roll Profile Changing Device,” by Sumitomo Metal Ken Masui.) FIG. 6 is a diagram showing a roll profile when a rolled material having the same width is rolled. It is. (From the Japan Iron and Steel Association, Nishiyama Memorial Technical Lecture, “Rolling Mill with Roll Profile Changing Device,” by Ken Masui, Sumitomo Metals.) FIG. 7 is a diagram schematically showing a roll profile measured online. FIG. 8 is a diagram showing a change in contact force when grinding a roll having the roll profile shown in FIG. 7 according to the first embodiment. FIG. 9 is a flowchart showing a control procedure of the rolling mill according to the first embodiment; FIG. 10 is a flowchart showing details of a roll profile measurement processing procedure in the flowchart of FIG. 9; FIG. 11 is a flowchart showing a control procedure of a rolling roll grinding apparatus according to a second embodiment of the present invention. FIG. 12 is a schematic view of a continuous hot rolling mill train according to a third embodiment of the present invention. FIG. 13 is a front view of the rotary grindstone. FIG. 14 is a diagram showing the relationship between the abrasive grain size of a rotating grindstone and the roll surface grinding roughness. FIG. 15 is a diagram showing the relationship between the abrasive grain size and the grinding ratio of a rotary grindstone. [Description of Signs] 1a: Rolling roll (vertical work roll) 1b: Rolling roll (vertical reinforcing roll) 3: Bearing box 4: Stand 5: Grinding unit 7: Traverse rail frame 13a: Control device 13b: Information processing device 14 : Rack 20: rotating wheel 21: wheel rotating shaft 22: wheel driving device 23: wheel feeding device 24: traverse device 58: traverse motor 85: final stand of continuous hot rolling mill train

Claims (1)

(57) [Claim 1] A grinding unit having a flat-type or cup-type rotary grindstone is provided for a rolling roll in a rolling mill , and one side of the rotary grindstone is rotated while rotating the rotary grindstone.
In the on-line rolling roll grinding method of grinding the rolling roll by pressing only the one contacting the rolling roll against the rolling roll and moving in the roll axis direction, the cubic boron nitride grinding wheel is used as a rotating grindstone of the grinding unit. Rings made of resin or diamond bonded abrasive grains
Using those having abrasive grain layer of Jo on one side, the size of the abrasive grains to any of No. 170/200 of No. 200/230, the width in the radial direction of the abrasive grain layer of the annular 30mm~5
An on-line rolling roll grinding method comprising setting the grinding unit to 0 mm, setting the grinding unit in a final stand of a continuous hot rolling mill row or a temper rolling mill, and grinding a rolling roll. 2. A flat surface against a rolling roll in a rolling mill.
Set up a grinding unit with
While rotating the rotating grindstone, one side of the rotating grindstone
The rolling roll so that only one of them is in contact with the rolling roll
, And move in the roll axis direction to
Roll roll grinding equipment for grinding rolls
And a cubic boron nitride grinding wheel as a grinding wheel for the grinding unit.
Rings made of resin or diamond bonded abrasive grains
The abrasive grain layer on one side is used, and the
Is any of the numbers 170/200 to 200/230
The width of the annular abrasive layer in the radial direction is 30 mm to 5 mm.
0 mm, and the grinding unit is the
It is installed on the final stand or temper rolling mill.
Online rolling roll grinding equipment. 3. A flat surface against a rolling roll in a rolling mill.
Set up a grinding unit with
While rotating the rotating grindstone, one side of the rotating grindstone
The rolling roll so that only one of them is in contact with the rolling roll
, And move in the roll axis direction to
An online rolling roll grinding device that grinds rolls
Thus, cubic nitride
Bonding boron or diamond abrasive with resin bond
Using an annular abrasive layer on one side
Grain size from 170/200 to 200/230
Either, the radial width of the annular abrasive layer is 30 m
An online rolling roll grinding device with m to 50 mm
A rolling mill train that is installed on the final stand.