JPH07314018A - Rolling machine equipped with online rolling roll grinding device and grinding method - Google Patents

Abstract

(57) [Abstract] [Purpose] In a rolling mill and a grinding method equipped with an online rolling roll grinding device, one grinding stone is used for each rolling roll, and high efficiency is achieved while ensuring high grinding ability and grinding stone life. To be able to grind the rolling rolls. [Structure] One grinding unit 5 having a flat type rotary grindstone 20, a grindstone driving device 22, a grindstone feeding device 23, and a grindstone moving device 24 is provided for one rolling roll 1a, and the grindstone 20 is provided.
The grinding wheel drive shaft 21 is tilted so that the contact position between the grinding roll 5a and the rolling roll 1a is on the center line side in the width direction of the grinding unit 5, and the grinding wheel rotation shaft 21 and the grinding wheel drive device 22 are opposed to each other with the center line of the grinding unit 5 interposed therebetween. Place on the side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-line rolling roll grinding device installed in a rolling mill, and more particularly to an on-line rolling roll grinding device suitable for efficiently grinding a rolling roll with one grindstone. And a grinding method.

[0002]

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

For example, Mitsubishi Technique 1988 Vol. 25,
No. 4 "Development of online roll grinder" and Japanese Utility Model Laid-Open No. 62-174705, a plurality of cup-shaped grindstones are installed in an integral frame, and the grindstones are not positively driven by a motor to roll. A technique is described in which a grindstone is pressed against a whetstone by using the rotational force of a rolling roll, and the grindstone is driven (rotated together), and the entire frame is moved in the roll axial direction to grind the entire surface of the rolling roll. 1
Of the prior art).

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

Further, Japanese Patent Laid-Open No. 6-47654 discloses that
Two flat-faced rotary whetstones with the abrasive grain layer fixed to a thin disk with elastic function are installed for each rolling roll, and the rotation axis of each rotary whetstone is seen by the abrasive grain layer on the rolling roll from the center of the whetstone. And arranged so as to contact on one side, by configuring the abrasive grain layer with cubic boron nitride abrasive grains or diamond abrasive grains, without absorbing vibration from the rolling roll and chattering phenomenon, A technique that enables grinding with a surface roughness of a rolling roll is described (hereinafter, referred to as a third conventional technique).

[0006]

However, the above-mentioned prior art has the following problems.

In the first prior art described above, since the cup-shaped grindstone is rotated together with the rotating force of the rolling roll, the grinding ability per grindstone is not high. Therefore, about 6 solid whetstones are required for each work roll. When the slab material is rolled, rolling rolls have non-rolled portions that do not wear at both ends of the roll. Therefore, if it is attempted to maintain a roll profile without steps, the pressing force of the grindstone at both ends of the roll increases, and the rolling roll wears very quickly. For this reason, it is necessary to frequently change the grindstones on both ends of the roll, and it is necessary to stop the rolling each time.

In the second prior art, since one grindstone is rotated together, the grinding ability is further lowered. Further, since the entire length of the roll is ground by using one grindstone, the grinding surface of the grindstone is reversed near the center of the roll axis (the inclination of the grindstone rotation axis is changed), but such a reversing mechanism is provided. This is extremely difficult due to space constraints.

Further, when the rolling roll is ground from the operation side end to the drive side end by using a plurality of cup-shaped grindstones as in the first conventional technique, the roll surface is caused by a minute difference in grinding performance between the grindstones. When the properties are different and they are transferred to the rolled material, streak-like gloss unevenness occurs on the surface of the rolled material.

On the other hand, in the third prior art, since the flat type rotary grindstone is positively driven to rotate, extremely high grinding ability and grindstone life can be obtained. However, even in the third conventional technique, since two rolling grindstones are used to grind the rolling roll, if the rolling roll is ground from the operation side end to the drive side end, the fine grinding performance of each rotating grindstone is reduced. The surface properties of the rolls differ due to the difference, and there is a problem in that when they are transferred to the rolled material, streaky uneven glossiness occurs on the surface of the rolled material.

An object of the present invention is to provide an on-line rolling roll grinding device that uses one grindstone for each rolling roll and can efficiently grind a rolling roll while ensuring high grinding ability and grindstone life. A rolling mill and a grinding method are provided.

[0012]

In order to achieve the above object, the rolling mill of the present invention adopts the following constitution. That is,
A rolling roll and a rolling roll grinding device for grinding the rolling roll online are provided, and the rolling roll grinding device includes one grinding unit provided for one rolling roll and the grinding unit. And means for moving in the axial direction of the rolling roll, the grinding unit,
A flat type rotating grindstone attached to the tip of the grindstone rotating shaft for grinding the rolling roll, a grindstone driving device for rotating the rotating grindstone rotating shaft to rotate the rotating grindstone, and a grindstone feed for pressing the rotating grindstone against the rolling roll. Equipped with a device,
In a rolling machine that performs grinding by tilting the grindstone rotating shaft so that the position where the rotating grindstone and the rolling roll contact each other is formed on one side when viewed from the center of the rotating grindstone, a grindstone rotating shaft of the grinding unit And a grindstone driving device are arranged so as to be located on opposite sides across the center line in the width direction of the grinding unit, and the grindstone so that the position where the rotating grindstone and the rolling roll contact each other is located on the centerline side. The rotation axis is tilted.

Further, in order to achieve the above object, the present invention adopts the above-mentioned constitution in a rolling mill further including a roll shift mechanism for moving a rolling roll in the roll axial direction.

In the above rolling mill, preferably, the grindstone rotating shaft is arranged such that the position where the rotary grindstone and the rolling roll contact each other is located on the center line. Also,
Preferably, the grindstone feeding device is arranged such that its axis is located on the center line, and the grindstone rotating shaft and the grindstone driving device are located on both sides thereof.

In the above rolling mill, preferably,
Preliminarily formed a small-diameter portion having a smaller roll diameter than the other portions at both ends of the rolling roll, and the length of the small-diameter portion is equal to or greater than the length of a range in which the rotary grindstone of the grinding unit cannot move in the roll axial direction. To do.

Further, when the rolling mill has a roll shift mechanism, preferably, a small diameter portion having a roll diameter smaller than that of the other portions is formed in advance at both end portions of the rolling roll, and the length of the small diameter portion is set to the above. The length is equal to or more than the length obtained by subtracting the movement amount of the rolling roll in the roll axis direction by the roll shift mechanism from the length of the range in which the rotary grindstone of the grinding unit cannot move in the roll axis direction.

Further, in a rolling mill having reinforcing rolls having chamfers at both ends of the rolls as the rolling rolls, it is preferable that the length of the chamfer is within a range in which the rotary grindstone of the grinding unit cannot move in the roll axial direction. More than that.

Further, in order to achieve the above object, the grinding method of the present invention is the method for on-line grinding a rolling roll in a rolling mill, wherein the grinding unit is moved in the axial direction of the rolling roll so that both ends of the rolling roll are moved. The rolling roll is ground so that the non-ground portions have the same length.

Further, in a rolling mill having a roll shift mechanism, the rolling roll is ground by combining movement of the grinding unit in the axial direction of the rolling roll and movement of the rolling roll by the roll shift mechanism.

[0020]

In the present invention configured as described above, the rotating grindstone is positively driven at a high speed by the grindstone driving device to enhance the grinding ability and the grindstone life, and to grind the rolling roll correctly with one grindstone for a long time. can do. Further, by performing the grinding by inclining the rotary axis of the grindstone with respect to the axis of the rolling roll so that the position where the rotary grindstone and the rolling roll contact each other is formed on one side when viewed from the center of the grindstone, the flat type grindstone The elastic body function is effectively exerted, whereby the vibration of the rolling roll can be easily absorbed, and correct grinding can be performed for a long time without causing chattering. By the way, when tilting the drive shaft of one flat type rotary grindstone in this way,
A part that cannot be ground (non-ground part) is generated at the end of the roll. In the present invention, the grindstone rotating shaft and the grindstone driving device are arranged so as to be located on opposite sides across the center line in the width direction of the grinding unit, and the contact position between the rotating grindstone and the rolling roll is located on the center line side. The grinding wheel rotation axis is tilted so that the length of the non-ground portion is shortened by grinding the rolling roll so that the length of the non-ground portion at both ends of the rolling roll is the same, and grinding is possible. Rollable roll surface length becomes long. As described above, in the present invention, one rolling stone is used for one rolling roll, and a rolling roll can be efficiently ground without using a special reversing mechanism while ensuring a high grinding ability and a grinding stone life. it can.

Further, in a rolling mill provided with a roll shift mechanism, both ends of the rolling roll are ground by grinding the rolling roll by combining movement of the grinding unit in the axial direction of the rolling roll and movement of the rolling roll by the roll shift mechanism. The length of the non-grinding portion in is further shortened, and in some cases, the entire length of the rolling roll can be ground.

By arranging the grindstone rotating shaft so that the contact position between the rotary grindstone and the rolling roll is located on the center line, when grinding is performed so that the non-ground portions at both ends of the rolling roll have the same length. The length of the non-ground portion is minimized, and the widest effective rolling length is obtained.

By arranging the grindstone feeding device such that its axis is located on the center line and the grindstone rotating shaft and the grindstone driving device are located on both sides thereof, it is easy to realize the above-mentioned contact position. Becomes

A small diameter portion having a smaller roll diameter than the other portions is preliminarily formed at both end portions of the rolling roll, and the length of the small diameter portion is equal to or longer than the range in which the rotary grindstone of the grinding unit cannot move in the roll axial direction. By doing so, there is no non-ground portion at the end of the roll, and problems such as deterioration of the plate shape of the rolled material due to the step between the ground portion and the non-ground portion of the roll end do not occur.

When the rolling mill has a roll shift mechanism, the length of the small diameter portion is moved from the length in the range in which the rotary grindstone of the grinding unit cannot move in the roll axis direction to the roll axis direction of the rolling roll by the roll shift mechanism. By setting the length to be equal to or more than the length obtained by subtracting the amount, the non-ground portion of the roll end portion is similarly eliminated, and the problem of a step can be avoided.

When the rolling roll is a reinforcing roll having chamfers at both ends of the roll, the length of the chamfer is set to be equal to or longer than a range in which the rotary grindstone of the grinding unit cannot move in the axial direction of the roll, whereby the subtotal portion is obtained. The same effect as can be obtained.

[0027]

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

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

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

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

As shown in FIGS. 2 and 3, the grinding unit 5 is a disk-shaped rotary grindstone 2 for grinding the work roll 1a.
0, a grindstone driving device 22 for rotating the rotary grindstone 20 via a grindstone rotating shaft 21, a rotary grindstone 20 for the rolling roll 1a.
It is provided with a grindstone feeding device 23 that presses against and a traverse device 24 that moves the rotary grindstone 20 in the axial direction of the rolling roll 1a.

The rotary grindstone 20 has a thin disk 52 having a boss 52a and an annular abrasive grain layer 51 fixed to the side surface of the thin disk 52 opposite to the boss. The thin disk 52 has a boss 52.
It is attached to the grindstone rotating shaft 21 at the portion a. Also,
The thin disk 52 has an elastic body function for absorbing vibrations from the rolling roll, and the rolling roll 1a and the abrasive grain layer 51.
The structure is such that the amount of bending changes depending on the contact force between them.

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

As shown in FIG. 2, the rotary grindstone 20 is arranged such that the axis Gc of the grindstone rotary shaft 21 is inclined by a small angle α with respect to the line Sc perpendicular to the axis Rc of the rolling roll 1a. The contact line between the abrasive grain layer 51 and the work roll 1a is formed only on one side when viewed from the center of the grindstone. The inclination angle α is preferably about 0.5 ° to 1.0 °. With such an arrangement of the rotary grindstone 20, the thin disk 52 can effectively exhibit the elastic body function.

As shown in FIG. 2, the grindstone driving device 22 is
A hydraulic motor 54 (which may be an electric motor) that rotationally drives the rotary grindstone 20 to a predetermined grindstone peripheral speed, a pulley shaft 54b and a belt 55 that transmit the rotation of an output shaft 54a of the liquid motor 54 to the grindstone rotary shaft 21. Has an output shaft 5
4a and pulley shaft 54b are parallel splines 54c
Are connected via. The pulley shaft 54b is rotatably supported by the body 59. The grindstone rotating shaft 21 is rotatably and axially movably supported in the body 59 through slide type radial bearings 21a and 21b. The rotary grindstone 2 is provided on the side opposite to the grindstone rotary shaft 21.
Load cell 5 for measuring the contact force between 0 and the work roll 1a
3 are arranged.

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

The grindstone feeding device 23, as shown in FIG.
A backlash that moves the feed motor 57 attached to the case 25 and the body 59 by the rotation of the feed motor 57 toward and away from the work roll 1a to feed the rotary grindstone 20, the grindstone rotary shaft 21, and the load cell 53 back and forth together. It has a less-type preload type ball screw 56 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 type ball screw 56.

As shown in FIG. 3, the traverse device 24 includes a traverse motor 58 attached to the case 25.
And a pair of guide rollers mounted on the rotating shaft of the traverse motor 58 and engaged with the rack 14, and a pair of guide rails mounted on the upper surface of the case 25 and engaged with a pair of guide rails 7a and 7b (see FIG. 1). 26 and an encoder 58b for detecting the rotation speed of the traverse motor 58. As shown in FIG. 1, the guide rails 7a and 7b are attached to a rail frame 7 which is extended on the entrance side of the rolling roll 1a along the axis of the rolling roll 1a. The rack 14 is formed on the side surface of the guide rail 7a on the side opposite to the rolling rolls. In this way, the grinding unit 5
While being supported by the rail frame 7 via the guide rollers 26 and the guide rails 7a and 7b, the traverse motor 58 and the pinion 58a and the rack 14 mesh with each other to smoothly move in the roll axial direction.

The roll grinding unit 5 includes the rolling roll 1a.
It is necessary to avoid interference with the bearing box 3 when replacing Therefore, both ends of the rail frame 7 are slidably supported by the guides 9 mounted on the stand 4 as shown in FIG. 1, and the grinding unit 5 is provided on the operation side and near the both ends of the rail frame 7, respectively. The rolling roll 1 together with the rail frame 7 is driven by the driving-side rail moving device 30.
It can be moved in the contact and separation direction of a. Each rail moving device 30 includes a hydraulic cylinder 11 whose tip is pin-connected to the rail frame 7.

Further, as a feature of the present invention, as shown in FIG. 2, the grindstone rotating shaft 21 of the rotary grindstone 20 and the grindstone driving device 2 are provided.
2 is arranged so as to be located on opposite sides of the center line Cc in the width direction of the case 25, and the whetstone rotary shaft 21 has a position where the rotary whetstone 20 and the rolling roll 1a contact each other, more preferably on the center line Cc side. Is inclined with respect to the axis of the rolling roll 1a so as to be located on the center line Cc. Further, the grindstone feeding device 23 is arranged such that its axis is located on the center line Cc, and the grindstone rotating shaft 21 and the grindstone driving device 22 are located on both sides thereof.

The feed motor 57 of the grindstone feeding device 22 and the traverse motor 58 of the traverse device 24 are controlled by the control devices 13a and 13b, respectively, as shown in FIG. Further, the load cell 53, the encoder 57a of the grindstone feeding device 23, and the encoder 58b of the traverse device 24.
The detection signal of is sent to the information processing device 13c and processed.
Further, the hydraulic motor 54 of the grindstone driving device 22 is connected to the hydraulic circuit 1
Driven by the fluid supplied from 3c, the hydraulic circuit 13
Controlling the opening degree of the valve by a command signal from the information processing device 13c, c controls the flow rate of the fluid supplied to the hydraulic motor 54 and controls the rotation speed of the hydraulic motor 54.

In the present embodiment configured as described above, the rotary grindstone 20 is positively driven at a high speed by the grindstone driving device 22 to enhance the grinding ability and the grindstone life, and grind for a long time with one grindstone. be able to. In addition, in this embodiment, as described in JP-A-6-47654, the rotary grindstone 20 is used.
Is capable of easily absorbing the vibrations of the rolling rolls and correctly grinding for a long time without causing chattering, which is effective in further increasing the grinding ability and the life of the grindstone.

That is, the rolling roll 1a vibrates while having a frequency of 10 to 150 C / S depending on the rolling speed. When a roll grinder with a general cylindrical grindstone is attached to a conventional offline grinder as an online grinder, the cylindrical grindstone and the rolling roll come into contact with each other via the abrasive grains on the surface of the grindstone, and the metal and the abrasive grains on the roll surface are Grinding while hitting.

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

If the grindstone vibrates the same as the vibration of the rolling roll, the contact force between the grindstone and the rolling roll does not change. However, when the grindstone and the entire grindstone frame are vibrated in synchronization with the rolling roll, the rolling roll vibration is 150 c / s.
It is difficult to follow because of high frequency. If the vibration of the rolling roll is not attempted to escape by the grindstone and the entire grindstone frame, but if the grindstone itself has an elastic function and the vibration is absorbed by the bending of the grindstone, the mass of the moving part will be reduced, and the vibration of the rolling roll will be promptly detected. And the fluctuation of the contact force between the grindstone and the rolling roll becomes smaller.

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

Further, in this embodiment, in order to effectively exert the elastic body function of the thin disk 52, as shown in FIG. 2, the contact position between the abrasive grain layer 51 and the rolling roll 1a is one side from the center of the grindstone. The grindstone rotating shaft 21 is tilted so as to be formed only on. By doing so, the thin plate disk 52 is bent in the form of a cantilever by the pressing force to the rolling roll 1a, and the vibration from the rolling roll 1a can be easily absorbed.

Further, in this embodiment, since the thin disk 52, which is the base metal for supporting the abrasive grain layer 51, has an elastic body function, the mass movable by the vibration from the rolling roll is the abrasive grain layer 51.
And thin disk 52, and superabrasive grains (cubic boron nitride abrasive grains) with a high grinding ratio (reduced work piece volume / reduced grindstone volume) that enables long-time grinding with a small weight in the abrasive grain layer 51. Alternatively, since the diamond abrasive grains are used, the mass of the movable portion becomes very small, and the natural frequency of the rotary grindstone 20 becomes high. Therefore, the vibrating rolling roll can be properly ground for a long time without causing chattering due to resonance.

Next, a grinding method using the rolling roll grinding apparatus of this embodiment will be described with reference to FIGS.

As described above, in the grinding unit 5 of this embodiment, the grindstone rotating shaft 21 is inclined by the angle α with respect to the orthogonal line of the rolling roll 1a. In this way, when one grinding unit 5 with the grindstone rotating shaft 21 tilted is moved in the roll axis direction of the rolling roll 1a to grind the rolling roll, as shown in FIG. If it interferes with 4, the grindstone cannot move further in the axial direction.
In order to solve this, it is necessary to make the case 25 of the grinding unit 5 small and make the movable distance long, but there is a limit to the size of the case 25. Therefore,
In the present embodiment, even if the size of the case 25 is the same, if the areas that cannot be ground at both ends of the rolling roll 1a are distributed to the same range, the areas that cannot be ground at both ends will be minimized. 5 is configured as described above, and the grinding unit 5 is moved in the axial direction of the rolling roll so that the lengths of the non-ground portions at both ends of the rolling roll 1a are the same, and the rolling roll is ground. Thus, the length of the roll surface that can be ground and can be rolled can be increased.

That is, the grinding unit 5 of this embodiment is
As described above, the grindstone rotating shaft 21 is arranged so as to be inclined so that the position where the rotary grindstone 20 and the rolling roll 1a contact each other is located on the center line Cc in the width direction of the case 25. Therefore, when the total width of the case 25 is W, the position where the rotary grindstone 20 and the rolling roll 1a contact each other is on a line segment that divides the width W into two equal parts, and the widths W1 and W2 on the left and right are equal from the contact position. Become. When the contact position between the rotary grindstone 20 and the rolling roll 1a is set in this way, as shown in FIG. 6, the grinding unit 5 moves to the operating side, the case 25 and the stand 4 interfere with each other, and the operating side of the rolling roll 1a that cannot be ground. End part 70
Roll L that cannot be ground because the length L1 of a and the grinding unit 5 move to the driving side and the case 25 and the stand 4 interfere with each other.
The length L2 of the portion 70b at the drive-side end of a is substantially equal.

Here, although the width of the rolled material changes, the rolling is performed so that the center of the rolling roll 1a and the center of the rolled material are always the same, so that the contact position of the rotary grindstone 51 is set on the case 25 as described above. If the lengths L1 and L2 of the non-grindable portions 70a and 70b at both ends of the roll are equal to each other on the center line in the width direction, the roll width of the rolling roll 1a that can be rolled is the effective rolling width L of the rolling roll 1a. It becomes L-2L1.

On the other hand, as shown in FIG. 7, the rolling roll 1a
If the contact position between the rotary grindstone 20 and the rotary grindstone 20 is on the side opposite to the center of the case 25, the operation-side end on the right side in the figure can be ground to the roll end, but the drive-side end on the left side in the figure is almost the entire width W of the case 25. When the length L3 is equal, the case 25 and the stand 4 interfere with each other and grinding cannot be performed. Therefore, the grindable range is L / 2 on the operation side (right side) from the center of the rolling roll 1a, but is L / 2-L3 on the drive side (left side). As a result, rolling is performed so that the center of the rolling roll 1a and the center of the rolled material are always the same, and thus the rollable width of the rolled material is L-2.
It becomes L3.

Therefore, according to the prior art, the width of rollable material that can be rolled is L-2L3, whereas in the present embodiment, it is L-2L1 and L1 is approximately 1/2 of L3. The width of the material becomes very wide.

As described above, according to the present embodiment, the rotary grindstone 20 is positively driven at a high speed by the grindstone driving device 22, and the rotary grindstone 20 absorbs the vibrations properly to prevent chattering for a long time. Since it can be ground, extremely high grinding ability and grinding wheel life can be obtained. Further, the grinding unit 5 is configured such that the contact position between the rotary grindstone 20 and the rolling roll 1a is located on the center line Cc in the width direction of the case 25, and the non-grinding portions 70 at both ends of the rolling roll 1a are formed.
Since the rolling rolls are ground so that the lengths of a and 70b are the same, the length of the roll surface that can be ground and can be rolled becomes long, and the rolling roll 1a can be efficiently ground by one grinding unit 5. it can. Further, in the present embodiment, as a result of grinding the rolling roll with one grinding unit 5 in this way, the roll surface properties differ due to the minute grinding performance difference of each grindstone as in the case of using a plurality of grinding units. It is possible to produce a high-quality plate product without causing streaky gloss unevenness on the surface of the rolled material.

Another embodiment of the grinding method of the present invention will be described with reference to FIGS. In this embodiment, the length of the non-ground portions 70a and 70b of the rolling roll 1a is further shortened by using the roll shift mechanism.

The hot rolling mill is provided with a roll shift mechanism 8 for moving the rolling roll 1a in the roll axial direction as shown in FIG. 8 in order to improve the local wear of the rolling roll 1a due to the end of the rolled material S. There are many rolling mills. The roll shift mechanism 8 includes a cylinder 81 for moving the bearing box 3 in the roll axis direction, a lever 82 for transmitting the movement of the cylinder 81,
It is composed of a shift frame 83 that holds the cylinder 81 and the lever 82 and is fixed to the stand 4.

In this embodiment, the rolling roll is ground by combining the movement of the grinding unit 5 in the roll axis direction with the movement of the rolling roll 1a with respect to the grinding unit 5 by the roll shift mechanism 8.

That is, by the action of the roll shift mechanism 8, the bearing housing 3 moves in the roll axial direction together with the rolling roll 1a. When moving the grinding unit 5 to the operation side (left side in the drawing), as shown in FIG. 9, the rolling roll 1a is moved to the drive side (right side in the drawing) by L4 so that the grinding unit 5 interferes with the stand 4 on the operation side. When it moves to the position Gc2 where it does not, the rotary grindstone 20 can grind to the vicinity of the driving-side end of the rolling roll 1a, and the non-grinding portion becomes 71b.

Next, when moving the grinding unit 5 to the driving side (right side in the drawing), as shown in FIG. 10, the rolling roll 1a is moved to the operating side (left side in the drawing) by L4 and the grinding unit 5 is operated. If you move near the bearing box 3 on the side,
The rotary grindstone 20 can grind up to near the end of the rolling roll 1a on the operating side, and the non-grinding portion is shortened to 71a.

In this way, one roll 1a
Even if the individual grinding units 5 are arranged, the movement of the grinding unit 5 in the roll axis direction to the vicinity of the end of the rolling roll 1a,
The rolling roll 1a is combined with the movement of the rolling roll 1a in the roll axial direction by the roll shift mechanism 8.
Can be ground more widely. Further, when the shift amount L4 of the roll shift mechanism 8 can be made larger than the lengths L and L2 of the non-ground portions at both ends of the roll when only the grinding unit 5 is moved, the entire length of the rolling roll can be ground.

Still another embodiment of the present invention is shown in FIGS.
Will be described.

In the first embodiment described above, the contact position between the rolling grindstone 20 and the rolling roll 1a is located on the center line Cc in the width direction of the case 25, so that the roll surface length that can be ground and can be rolled is long. However, portions 70a and 70b having lengths L1 and L2 that cannot be ground are formed at both ends of the rolling roll 1a, and a step is formed between this portion and the ground portion. Also in the second embodiment using the roll shift mechanism, when the shift amount L4 is shorter than the lengths L1 and L2 of the non-grinding portions, the non-grinding portions 71a and 71b are generated and a step is formed. Even when performing on-line grinding, regular off-line grinding is performed for roll management, and therefore, when the plate material to be rolled has a large plate thickness, the step difference is not a problem. However, when rolling a thin product, this step may cause a problem such as deterioration of the plate shape. This embodiment takes this point into consideration.

In FIG. 11, in the rolling mill of this embodiment,
Before the rolling roll 1a is inserted into the rolling mill, the rolling roll 1a is ground by grinding with an offline grinder.
Small diameter portions 90a, 90b having a smaller roll diameter than the other portions are formed in advance at both end portions of the. The lengths L5 and L6 of the small diameter portions 90 and 90b are set to be equal to or longer than the lengths L1 and L2 of the portions 70a and 70b in which the rotary grindstone of the grinding unit 5 in the first embodiment cannot move in the roll axis direction.
Preferably, the lengths L1 and L2 are substantially equal. As a result, a step having a diameter larger than that of the rolling portion is not generated at the end portion of the roll by the online roll grinding device, so that a problem such as deterioration of the plate shape on the rolled material does not occur.

FIGS. 11 and 12 apply the above idea to the second embodiment using the roll shift mechanism.

That is, in the second embodiment using the roll shift mechanism, the shift amount L4 of the roll shift mechanism is used.
When the length of the non-ground portion cannot be made larger than the lengths L1 and L2 of the non-ground portion, small-diameter portions 91a and 91b each having a roll diameter smaller than those of the other portions are formed in advance at both ends of the rolling roll 1a. 91b lengths L7, L8
The length L1-L obtained by subtracting the shift amount L4 of the roll shift mechanism 8 from the lengths L1 and L2 (see FIG. 6) of the range in which the rotary grindstone 20 of the grinding unit 5 cannot move in the roll axis direction.
4, L2-L4 or more, and preferably substantially equal to the length. In this way, as shown in FIGS. 12 and 13, by performing the grinding by combining the movement of the grinding unit 5 and the movement of the rolling roll 1a, it is possible to perform online grinding without causing a step at the end of the roll. .

Yet another embodiment of the present invention is shown in FIGS.
Will be described. In this embodiment, an online roll grinding device is attached to the reinforcing roll 1b.

For the reinforcing roll 1b, an online roll grinding device is used to remove the surface roughness of the roll, not the wear caused by the rolled material S. Therefore, it is sufficient to provide one grinding unit 5 for one reinforcing roll 1b. FIG. 14 shows the grinding unit 5 mounted in this way. In this way, even when one grinding unit 5 is attached to the reinforcing roll 1b, the grinding roll 5 and the rolling roll 1b are rotated in the same manner as in the first embodiment so that the one grinding unit 5 grinds the central part of the roll more widely. The contact position with the grindstone 20 may be located on the center line of the grinding unit 5 in the width direction, and the widths W1 and W2 from the center line to the entire width W of the case 25 may be equal.

Further, generally, the reinforcing roll 1b is shown in FIG.
As shown in FIG. 5, large chamfered portions 95a and 95b called Changha are formed at the ends of the roll. Therefore, the chamfers 95a and 95b are used as the small-diameter portions of the embodiment of FIG. 11, and the length of the chamfers 95a and 95b is set to the length L7 or L8 of the non-grindable portion or more, whereby the roll end is ground. There is no step difference between the ground portion and the unground portion.

[0070]

According to the present invention, the rotating grindstone is positively driven at a high speed by the grindstone driving device so that the contact position between the rotating grindstone and the rolling roll is formed on one side when viewed from the center of the grindstone. Since the grinding is performed with the axis tilted, it is possible to correctly grind the rolling roll for a long time with one grindstone while ensuring high grinding ability and grindstone life. Further, the grindstone rotating shaft and the grindstone driving device are arranged so as to be located on opposite sides across the center line in the width direction of the grinding unit, and the contact position between the rotary grindstone and the rolling roll is located on the centerline side. Since the rotation axis is tilted, one rolling unit can be used for one rolling roll to grind a wide rolling portion of the rolling roll, which enables efficient rolling of the rolling roll. Further, the ability of the grinding unit can be effectively utilized, and the online roll grinding device can be provided in the rolling mill with a small space and a small equipment cost.

Further, since one roll is ground by one grindstone, there is no difference in the grinding performance of the grindstones, so that the surface properties of the rolls after grinding can be made constant. Further, since there is no grindstone wrap due to different grindstones, there is no concern that streak-like gloss unevenness caused by the grindstone lap will occur in the rolled material.

Further, according to the present invention, in the rolling mill having the roll shift mechanism, the rolling rolls can be ground more widely by one grinding unit by performing the grinding by combining the axial movements of the rolling rolls.

By forming small-diameter portions at both ends of the rolling roll in advance, the non-ground portion of the roll end can be completely eliminated, and rolling due to a step between the ground portion and the non-ground portion of the roll end. It is possible to avoid problems such as deterioration of the plate shape of the material.

When the rolling roll is a reinforcing roll, by providing one grinding unit for one reinforcing roll, the online roll grinding device having the above effect can be incorporated into the rolling mill with a small equipment cost. The rough surface of the roll surface of the reinforcing roll can be removed with.

[Brief description of drawings]

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

FIG. 2 is a horizontal sectional view of a grinding unit.

FIG. 3 is a vertical sectional view of a grinding unit.

FIG. 4 is a diagram showing a control system of an online rolling roll grinding device.

FIG. 5 is a diagram showing interference between the rotary grindstone and the stand when the rotary grindstone shaft is tilted so that the rolling roll and the rotary grindstone come into contact with each other at the end of the grinding unit.

FIG. 6 is a view showing a range that can be ground by one grinding unit when the rotary grindstone shaft is tilted so that the rolling roll and the rotary grindstone are in contact with each other in the central portion of the grinding unit in the present embodiment.

FIG. 7 is a diagram showing a range in which one grinding unit can grind when a rotary grindstone shaft is tilted so that a rolling roll and a rotary grindstone come into contact with each other at an end of the grinding unit.

FIG. 8 is a partial cross-sectional plan view of a rolling mill provided with an online roll grinding device in an example in which the present invention is applied to a rolling mill having a roll shift mechanism.

FIG. 9 is a view showing a range in which one roll grinding unit can grind when a rolling roll is moved to an operating side by using a work roll shift mechanism.

FIG. 10 is a diagram showing a range in which one roll grinding unit can grind when a rolling roll is moved to a driving side by using a work roll shift mechanism.

FIG. 11 is a diagram showing a grinding method in an example in which a small diameter portion is provided in advance on both end portions of a rolling roll.

FIG. 12 is a view showing a range in which a small-diameter portion is provided in advance on both ends of a rolling roll and a single roll grinding unit can grind when the rolling roll is moved to the operating side by using a work roll shift mechanism.

FIG. 13 is a diagram showing a range in which a small-diameter portion is provided in advance on both end portions of a rolling roll and a single roll grinding unit can grind when the rolling roll is moved to a drive side by using a work roll shift mechanism.

FIG. 14 is a partial cross-sectional side view of a rolling mill in an example in which a reinforcing roll is equipped with an online roll grinding device.

FIG. 15 is a diagram showing a method of grinding a reinforcing roll in the rolling mill shown in FIG.

[Explanation of symbols]

 1a: Rolling roll (upper and lower work rolls) 1b: Rolling roll (upper and lower reinforcement rolls) 3: Bearing box 4: Stand 5: Grinding unit 7: Traverse rail 8: Roll shift device 14: Rack 20: Rotating grindstone 21: Grindstone rotation Axis 22: Grindstone driving device 23: Grindstone feeding device 24: Traverse device 70a, 70b; 71a, 71b: Non-grinding part 90a, 90b; 91a, 91b: Small diameter part 95a, 95b: Chanha 58: Traverse motor

Claims (9)

[Claims] 1. A rolling roll and a rolling roll grinding device for grinding the rolling roll online, wherein one rolling roll grinding device is provided for each rolling roll.
It has a grinding unit provided individually, and a means for moving the grinding unit in the axial direction of the rolling roll, and the grinding unit is a flat type rotation machine which is attached to the tip of a grindstone rotating shaft and grinds the rolling roll. A grindstone, a grindstone driving device that rotates the grindstone rotating shaft to rotate the rotary grindstone, and a grindstone feeding device that presses the rotary grindstone onto the rolling roll, and a position where the rotary grindstone and the rolling roll contact each other. In a rolling mill that tilts and grinds the grindstone rotation axis so that it is formed on one side when viewed from the center of the rotary grindstone, the grindstone rotation axis of the grinding unit and the grindstone drive are centered in the width direction of the grinding unit. It is arranged so as to be located on opposite sides of a line, and the grindstone rotating shaft is tilted so that the position where the rotating grindstone and the rolling roll contact each other is located on the center line side. A rolling mill characterized by that. 2. A rolling roll, a rolling roll grinding device for grinding the rolling roll online, and a roll shift mechanism for moving the rolling roll in the roll axial direction. It has one grinding unit provided for each rolling roll, and means for moving the grinding unit in the axial direction of the rolling roll, and the grinding unit is attached to the tip of the grindstone rotating shaft to perform the rolling. A flat type rotating grindstone for grinding a roll, a grindstone driving device for rotating the rotating grindstone rotating shaft to rotate the rotating grindstone, and a grindstone feeding device for pressing the rotating grindstone onto the rolling roll, the rotating grindstone and the In a rolling mill that performs grinding by inclining the grindstone rotation axis so that a position in contact with a rolling roll is formed on one side when viewed from the center of the rotary grindstone, The grindstone rotating shaft of the grinding unit and the grindstone driving device are arranged so as to be positioned on opposite sides across the center line in the width direction of the grinding unit, and the position where the rotating grindstone and the rolling roll contact each other is the center line. A rolling mill, wherein the grindstone rotating shaft is inclined so as to be located on the side. 3. The rolling mill according to claim 1, wherein the whetstone rotary shaft is arranged such that a position where the rotary whetstone and the rolling roll contact each other is located on the center line. . 4. The rolling mill according to claim 1 or 2, wherein the axis of the grindstone feeding device is located on the center line, and the grindstone rotating shaft and the grindstone driving device are located on both sides thereof. A rolling mill characterized by being arranged. 5. The rolling mill according to claim 1, wherein a small diameter portion having a roll diameter smaller than that of the other portion is formed in advance at both end portions of the rolling roll, and the length of the small diameter portion is rotated by the rotation of the grinding unit. A rolling mill characterized in that the length of the grindstone is longer than the range in which it cannot move in the roll axis direction. 6. The rolling mill according to claim 2, wherein a small diameter portion having a roll diameter smaller than that of the other portion is formed in advance at both end portions of the rolling roll, and the length of the small diameter portion is rotated by the rotation of the grinding unit. A rolling mill having a length equal to or greater than a length obtained by subtracting a movement amount of a rolling roll in the roll axis direction by the roll shift mechanism from a length of a range in which a grindstone cannot move in the roll axis direction. 7. The rolling mill according to claim 1, wherein the rolling roll has reinforcing rolls having chamfers at both ends thereof, and a length of the chamfer is moved by a rotary grindstone of the grinding unit in a roll axial direction. A rolling mill characterized by having a length that exceeds the impossibility range. 8. The on-line grinding method for a rolling roll in a rolling mill according to claim 1, wherein the grinding unit is moved in the axial direction of the rolling roll so that the non-grinding portions at both ends of the rolling roll have the same length. A grinding method comprising grinding the rolling roll as described above. 9. The on-line grinding method for a rolling roll in a rolling mill according to claim 1, wherein the movement of the grinding roll in the axial direction of the grinding unit and the movement of the rolling roll by the roll shift mechanism are combined to perform the rolling. A grinding method characterized by grinding a roll.