JPH06335849A - Roll surface grinding device - Google Patents

Abstract

PURPOSE:To grind a roll to each desired surface roughness and roll shape, without making the grinding unevenness such as chattering mark. CONSTITUTION:A roll surface grinding device is equipped with a driving motor 54, feeding motor 57, and a traverse motor 58 for a rotary grinding wheel 20, and when the rotary grinding wheel 20 is applied with the vibration of a roll, the vibration is absorbed in a moment, by the deflection of the thin disc 52 of the rotary grinding wheel 20. The contact force between an abrasive grain layer 51 and the roll is measured by a load cell, and the grinding quantity is adjusted by controlling the contact force by the motor 57, and the roll surface is ground to an arbitrary profile.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a roll surface grinding apparatus for grinding online the surface of a roll that continuously moves strip-shaped materials such as thin steel plates and papers.

[0002]

2. Description of the Related Art Various rolls for moving thin steel plates greatly affect product quality depending on the maintenance status of equipment. Since the surface condition of the roll is in direct contact with the product, even a small scratch or deterioration of the surface roughness of the roll has a great influence on the surface quality of the product. Until now, in order to maintain the normal surface condition of the roll, the operator must remove the metal burned pieces and scratches on the roll surface into the machine at one or one place with a hand grinder, When there is a step between the sheet and the non-passage plate, a flaw on the roll, or the surface roughness deteriorates, the roll is removed and grinding is performed with an offline grinder.

Further, Japanese Unexamined Patent Publication No. 63-317207 proposes a roll polishing apparatus that grinds by pressing a prismatic block-shaped grindstone against many rotating rolls (first).
Prior art).

Also, although it is not for a roll that continuously moves a strip-shaped material, Mitsubishi Engineering 1988 Vo
l. 25 No. 4 According to "Development of online roll grinder", a plurality of rotating grindstones are arranged on one rolling roll, and the rotating grindstone is driven by the rotational force of the rolling roll without actively driving the rotating grindstone. A technique is known in which grinding is performed by the difference in rotational speed between a rolling roll and a grindstone (second conventional technique).

Further, in "Accurate constant pressure grinding of rolling rolls" in a collection of lectures by the 1992 Spring Meeting of the Precision Engineering Society of Japan, "Cubic Boron Nitride (CBN) Abrasive" is used as an abrasive grain layer of a cup-type rotary grindstone. It has been reported that the result of an experiment was carried out by grinding the rolling roll by arranging it with grains and arranging the rotation axis of the rotating grindstone so as to be substantially orthogonal to the rolling roll (hereinafter, referred to as a third conventional technique).

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

[0007]

As described above, in various rolls for moving a thin steel plate, the quality of the roll surface is maintained by an operator entering the machine and manually grinding or removing the roll with an offline grinder. I went with or without grinding. However, recently, due to the increase in maintenance costs, there has been a demand for a facility that can automatically correct such flaws and surface roughness online.

In the first prior art, since the grindstone is not rotating, it is not possible to grind a hard roll material into the required surface roughness and roll shape in a short time. In addition, since the grindstone does not rotate, it is easy for the grindstone to be clogged with grinding powder and seizure, and because the grindstone has a prismatic shape, its corners are missing and the life is short, which easily causes an accident. Therefore, it is impossible to maintain a constant grinding ability for a long time.

In the second prior art, since the rotating grindstone is driven and ground by the rotational force of the roll, the maximum peripheral speed of the rotating grindstone cannot exceed the peripheral speed of the roll. Therefore, when this conventional technique is applied to the grinding of the moving roll according to the present invention, the moving speed of the thin steel plate or the paper is 200 m / mi.
Since it is about n, it is difficult to achieve the wheel speed required for grinding even if the roll is rotated by using the drive device of the equipment.
For this reason, since the grinding amount is limited, it is not possible to grind a hard roll material into the required surface roughness and roll shape in a short time.

In the third conventional technique, when the vibrating roll is ground because the grindstone is rotating, unevenness due to chattering occurs on the roll surface. Further, the grindstone is also significantly consumed by the impact force due to the chattering phenomenon, the life of the grindstone is shortened, and it becomes necessary to frequently replace the grindstone.

In the fourth conventional technique, the elastic body absorbs the vibration of the roll. However, in this conventional technique, since the whole grindstone including the grindstone base metal is supported by the elastic body and moves back and forth, there is a problem that the mass of the movable part of the grindstone, that is, the weight of the part that moves following the vibration is heavy. When the mass of the movable part becomes heavy, the natural frequency of the movable part becomes low. When the natural frequency of the movable part is low, the vibration of the roll causes the movable part including the elastic body to resonate, which eventually causes chatter marks on the roll surface and accelerates the abrasion of the grindstone. If the diameter of the grindstone is made small and the mass of the movable part is made small, the grinding ability is greatly reduced.

It is an object of the present invention to provide a compact roll surface grinding device capable of grinding a roll having a required surface roughness and a roll shape without causing uneven grinding such as chatter marks.

[0013]

In order to achieve the above object, the present invention provides a disk-shaped rotary grindstone for grinding the surface of a roll for continuously moving a strip-shaped material such as a thin steel plate and paper.
A drive device for rotating this rotating grindstone by a grindstone rotating shaft,
In a roll surface grinding apparatus having a traverse device that moves the rotary grindstone to the roll, the rotary grindstone in the axial direction of the roll, the rotary grindstone is a thin disk attached to the grindstone rotary shaft, An abrasive grain layer fixed to a side surface of the thin disk with respect to the roll surface is provided, and the thin disk has an elastic body function for absorbing vibration from the roll.

The abrasive layer preferably contains superabrasives such as cubic boron nitride abrasives and diamond abrasives. Further, the feeding device is preferably a rotary drive source and a ball screw with a small backlash that converts the rotation of the rotary drive source into an axial movement of the rotary drive shaft to move the rotary grindstone back and forth with respect to a roll. Mechanism or gear mechanism.

Further, the roll surface grinding apparatus preferably controls load detecting means for measuring a contact force between the rotary grindstone and the roll, and the contact force measured by the load detecting means by the feeding device. And a control means for adjusting the grinding amount of the roll by the rotary grindstone to grind the roll into a predetermined profile.

In the roll surface grinding apparatus, the load detecting means for measuring the load of the driving device for rotating the rotary grindstone and the load measured by the load detecting means are controlled by the feeding device to perform rolling by the rotary grindstone. It may further include a control unit that adjusts the grinding amount of the roll and grinds the rolling roll into a predetermined roll profile.

Further, the roll surface grinding apparatus is preferably a load detecting means for measuring a contact force between the rotating grindstone and the roll, and a moving amount detecting means for measuring a moving amount of the rotating grindstone in a roll axial direction. And a profile calculation means for obtaining the roll profile from the contact force measured by the load detection means and the movement amount measured by the movement amount detection means by driving the traverse device while keeping the position of the feeding device constant. Further has.

The roll surface grinding device includes a load detecting means for measuring a contact force between the rotary grindstone and the roll, a first moving amount detecting means for measuring a moving amount of the feeding device, and a rotating grindstone of the rotating grindstone. Second movement amount detecting means for measuring the movement amount in the roll axis direction, and the traverse device is driven while the contact force measured by the load detecting means is kept constant, and the movement amount is measured by the first movement amount detecting means. You may further have the profile calculation means which calculates | requires the profile of the said roll from the movement amount and the movement amount measured by the said 2nd movement amount detection means.

Further, preferably, the abrasive grain layer has an annular shape, and the rotary grindstone is arranged so as to contact the roll at a position near a string inscribed in the annular abrasive grain layer.

..

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

By forming the abrasive grain layer with superabrasive grains, particularly with crystallized boron nitride abrasive grains or diamond abrasive grains, a 100% grindstone using aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) type abrasive grains. A grinding ratio more than double is obtained, and long time grinding is possible with a small weight. Therefore, the mass of the movable portion of the rotary grindstone is further reduced, which is effective in preventing resonance during grinding, and the grindstone replacement frequency is reduced, thereby improving the productivity of the equipment.

Superabrasive grains have good thermal conductivity and are suitable for releasing grinding heat. In addition, a thin disk that supports superabrasive grains to facilitate the escape of grinding heat is made of aluminum or its alloy, and by giving this thin disk an elastic function, the rotary whetstone has a simple structure and many functions. Will be able to fulfill.

The feeding device for pressing the rotating grindstone against the roll causes chattering unless a mechanism having a high spring constant is used. As a compact feeder with a high spring constant, a mechanism that drives a backlashless type preload type ball screw with an electric motor is optimal. Further, this mechanism is capable of holding the position of the rotating grindstone during grinding and feeding the minute rotating grindstone back and forth.

When the contact force between the roll and the rotary grindstone is constantly measured and the contact force is further changed, the amount of grinding of the rotary grindstone per roll unit time changes. By constantly measuring this contact force and controlling to increase or decrease the contact force,
The roll can be ground to any profile.
Further, by controlling the feeding device so as to keep the contact force constant, it is possible to grind only the same size over the entire cylindrical portion of the roll. In other words, keep the original profile,
The entire length can be ground. Further, by controlling the feeding device so as to keep the contact force constant and arbitrarily controlling the moving speed of the rotary grindstone in the axial direction, the roll can be ground into an arbitrary profile.

Further, without measuring the contact force between the roll and the rotary grindstone, the load of the driving device for rotating the rotary grindstone is measured,
By controlling the feeding device to increase or decrease this load, the roll can be ground to an arbitrary profile. Further, if the feeding device is controlled so as to keep this load constant, it is possible to grind the same size over the entire length of the roll. Further, by controlling the feeding device so as to keep the load constant and arbitrarily controlling the moving speed of the rotary grindstone in the axial direction, the roll can be ground into an arbitrary profile.

In the profile calculation means,
A rotary grindstone is pressed against a rotating roll by a feeder to bend the thin plate disk by a certain amount, and then the feeder is fixed, and the contact force between the roll and the rotary grindstone at that time is measured by a load detecting means. Then, the rotating grindstone is moved in the axial direction of the roll by the traverse device, the moving amount is measured by the moving amount detecting means, and the contact force is measured by the load detecting means.

Here, the abrasive grain layer of the rotary grindstone is supported by a thin disk having an elastic body function, and since the spring constant of the thin disk is constant, the contact force increases as the bending amount of the thin disk increases. . On the contrary, when the amount of bending decreases, the contact force also decreases. On the other hand, if the rotating grindstone moves parallel to the axis of the roll, the thin disk of the rotating grindstone when the feeding device is fixed,
The larger the roll diameter, the greater the deflection, and the smaller the roll diameter, the smaller the deflection.

Therefore, the profile of the roll is obtained by obtaining the amount of bending of the thin disk from the measured value (contact force) of the load detecting means, and organizing the amount of bending in association with each position in the roll axial direction. .

In another profile calculating means, a rotating grindstone is pressed against a rotating roll by a feeding device,
After bending the thin disk by a certain amount, the feeding device is controlled so that the amount of bending (contact force) is always constant. The amount of movement of the rotary grindstone in the axial direction of the grindstone rotation axis is measured by the first movement amount detecting means, and then the traverse device moves the rotary grindstone in the axial direction of the roll, and the amount of movement is detected as the second movement amount. Measure by means. The profile of the roll is obtained by obtaining the amount of movement of the rotary grindstone in the axial direction of the grindstone rotation axis from the measurement value of the first movement amount detecting means, and organizing the amount of movement in association with each position in the roll axial direction. To be

By arranging the rotating grindstone on the roll so that the contact line between the abrasive grain layer and the roll is at one place,
The thin disk is bent in the form of a cantilever by the pressing force against the roll, the elastic function of the thin disk is effectively exhibited, and the vibration from the roll can be easily absorbed. Further, since the contact line is formed at one location on one side of the center of the grindstone, the chattering phenomenon can be further suppressed and the contact force can be controlled appropriately. Further, by forming the contact line near the chord inscribed in the annular abrasive grain layer, a long contact line can be obtained even if the radial width of the abrasive grain layer is small, and stable grinding becomes possible.

[0031]

Embodiments of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 100 denotes four metal rolls installed for the purpose of transporting a strip-shaped product S such as a thin steel plate and paper (hereinafter, represented by a thin steel plate), which is unwound from an unwinding device 101. The thin steel plate S is wound around the tension roll 102 to apply tension to the thin steel plate S,
The four metal rolls 100 are wound in an S shape and moved while being in close contact with the roll surface. Each of such metal rolls 100 is provided with a roll surface grinding device 103 of this embodiment.

In FIG. 2, the metal roll 100 is supported by two columns 104 via bearings, and is driven by a motor 105. Roll surface grinding apparatus 103 of the present embodiment
Is a slide rail 107 that is attached to the support column 104 via an arm 106 and is extended in parallel with the metal roll 100.
And a grinding unit 107 that moves on the slide rail 107.
And have.

As shown in FIGS. 2 and 3, the grinding unit 108 includes a disk-shaped rotary grindstone 20 for grinding the metal roll 100, a drive unit 22 for rotating the rotary grindstone 20 by a grindstone rotary shaft 21, and a metal roll 100. Rotating grindstone 20
It is provided with a feeding device 23 that presses against and a traverse device 24 that moves the rotary grindstone 20 in the axial direction of the metal roll 100.

As shown in the enlarged view of FIG. 4, the rotary grindstone 20 includes a thin disk 52 having a boss 52a and a thin disk 52.
The ring-shaped abrasive grain layer 51 fixed to the side opposite to the boss side, that is, the side surface on the roll side, and the thin disk 52 is attached to the grindstone rotating shaft 21 at the boss 52a. Further, the thin disk 52 has an elastic body function for absorbing vibration from the work roll, and has a structure in which the amount of bending changes depending on the contact force between the metal roll 100 and the abrasive grain layer 51. The thin disk 52 is preferably 1000 kg because of its elastic function.
It has a spring constant of f / mm to 30 Kgf / mm, more preferably 500 Kgf / mm to 50 Kgf / mm. The abrasive grain layer 51 is made into an integral structure with the thin disk 52 by an adhesive so that it can be stably adhered to the vibrating metal roll 100.

The abrasive grain layer 51 is made of cubic boron nitride abrasive grains (generally called CBN) or diamond abrasive grains that are superabrasive grains, and uses a resin bond as a binder. It is hardened. 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.

The grindstone rotating shaft 21 is substantially perpendicular to the axis of the metal roll 100, and as shown in FIG.
Are arranged so as to be in contact with the roll 100 at one location near the string AB inscribed in the annular abrasive grain layer 51. With such an arrangement of the rotary grindstone 20, the thin plate disk 52 can effectively exhibit the elastic body function without causing chattering phenomenon, and the contact line AB is lengthened to enable stable grinding. .

As shown in FIG. 3, the drive device 22 transmits the drive motor 54 for rotating the rotary grindstone 20 to a predetermined grindstone peripheral speed and the rotation of the output shaft 54a of the drive motor 54 to the rotary grindstone 20. Of the grinding wheel rotating shaft 21, a body 59 that rotatably supports the grinding wheel rotating shaft 21 via radial bearings 21a and 21b, and an ammeter 54a that detects the load (rotation torque) of the drive motor 54. . The body 59 is mounted on the base 2 via the slide bearing 25a.
5 is mounted movably in the axial direction of the grindstone rotating shaft 21. Further, at the rear of the body 25, a load cell 5 for measuring the contact force between the surface of the metal roll 100 and the rotary grindstone 20.
3 is installed.

The feeding device 23 moves the body 59 in the contacting / separating direction of the metal roll 100 by the rotation of the feeding motor 57 attached to the base 25 and the feeding motor 57, and the rotating grindstone 20, the grindstone rotating shaft 21, and the load cell 53. It has a backlashless type preload type ball screw mechanism 56 for feeding back and forth together, and an encoder 57a for detecting the rotation angle of the feed motor 57. A backlashless type gear mechanism may be used instead of the preload type ball screw mechanism 56.

The traverse device 24 has a traverse motor 58 attached to the base 25, a pinion 58 a mounted on the rotating shaft of the traverse motor 58 and meshing with the rack 14, and allows the base 25 to travel on the slide rail 107. It has a slide bearing 26 and an encoder 58b for detecting the rotation speed of the traverse motor 58. The rack 14 is formed on the side surface of the sliding rail 107 on the side opposite to the roll side. In this way, the grinding unit 108
While being supported by the slide rail 107 via the slide bearing 26, the traverse motor 58 is rotated and the pinion 58a and the rack 14 are meshed with each other to allow smooth movement in the roll axis direction.

The drive motor 54 of the drive unit 22, the feed motor 57 of the feed unit 22, and the traverse motor 58 of the traverse unit 24 are controlled by the control unit 7 as shown in FIG. Further, the detection signals of the load cell 53, the ammeter 54a, the encoder 57a, and the encoder 58b are sent to the information processing device 8 and processed. Further, the detection signals of the ammeter 54a, the encoder 57a, and the encoder 58b are the control device 7
And used for feedback control.

Next, the roll surface grinding apparatus 10 of this embodiment
The operation of No. 3 will be described. The contact portion between the metal roll 100 and the thin steel plate S or the paper may be scratched or roughened during long-term use. In order to always flatten the surface of the metal roll 100 and keep the roll surface roughness constant, the rotary grindstone 20 is rotated by the drive motor 54, and the rotary grindstone 21 is fed to the rotating metal roll 100.
7, pressing using the ball screw mechanism 6, the thin disk 52
While deflecting a certain amount, the rotating grindstone 20 is moved in parallel with the roll axis by using the traverse motor 58 to grind the roll surface.

When attempting to grind the metal roll 100, minute vibrations occur due to the gaps in the bearing box and the bearing that support the metal roll 100. However, in order to properly grind the roll surface without causing chattering, the contact pressure between the roll surface and the grindstone must be kept within a certain range.

In the present embodiment, the thin disk 52, which is a part of the rotary grindstone 20, has an elastic body function so that the grindstone itself has an elastic body function, and the metal roll is rotated while rotating the rotary grindstone 20. The surface of 100 is pressed and bent. At this time, the rotary grindstone 20 is pushed by the vibration from the metal roll 100, but as shown in FIG.
2 flexes and instantly absorbs the vibration from the metal roll 100. As a result, the fluctuation in the contact force between the abrasive grain layer 51 and the metal roll 100 falls within a range in which the elastic force generated by the bending of the thin disk 52 is small, and the chattering phenomenon can be eliminated.

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

That is, in this embodiment, the thin disk 52, which is the base metal of the abrasive grain layer 51, has an elastic body function. Also,
In order to effectively exhibit the elastic body function, as shown in FIG. 4, the contact line between the abrasive grain layer 51 and the metal roll 100 is set at one place near the inscribed chord AB, and with respect to the axis of the grindstone rotating shaft 21. Offset. By doing so, the thin plate disk 52 bends in the form of a cantilever by the pressing force against the metal roll 100, and the elastic body function of the thin plate disk 52 can be effectively exerted.

When the thin plate disk 52 exerts the elastic function as described above, in order to absorb the vibration of the metal roll 100 and reduce the change range of the contact pressure, the thin plate disk 5 is used.
The spring constant of 2 must be chosen appropriately. Further, under such conditions, the following conditions are required so that the contact force can be properly maintained within the allowable change range and the grindstone does not resonate even if the metal roll vibrates.

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

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

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

[0050]

[Equation 1]

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

In the case of a grindstone using aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) type abrasive grains generally used as a grindstone, if the grindstone mass is reduced, the grindstone will be consumed immediately, It is necessary to change the grindstone many times a day, which greatly reduces the productivity of the equipment.

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

The material of the metal roll 100 is hard in order to reduce wear and hard-plated,
Hard to grind. With the intention of using aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) type abrasive grains, it is difficult to raise the grinding ratio to 50 cc / cc or more when a hard roll is ground.

However, the rotating grindstone 20 of this embodiment, which is formed by using crystal boron nitride (CBN) abrasive grains or diamond abrasive grains which are generally called superabrasive grains, is the metal roll 100.
The grinding ratio exceeds 500 cc / cc even when it is ground, and has a grinding ratio 100 times or more that of a grindstone using aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) based abrasive grains. By utilizing this high grinding ratio of superabrasive grains and using these abrasive grains as a grindstone of an online roll grinding device, it becomes possible to grind for a long time with a small weight.

Further, in this embodiment, the base metal having the abrasive grain layer 51 is used as a thin plate disc 52, and the thin plate disc 52 is provided with an elastic body function so that the abrasive grain layer 51 and the elastic body function member are integrated. There is. Therefore, the mass that can be moved by the vibration from the metal roll 100 is only the abrasive grain layer 51 and the thin disk 52, and the mass of the movable part can be made very small, and the natural frequency of the rotary grindstone 20 can be increased.

As described above, in this embodiment, in order to reduce the mass of the movable portion, superabrasive grains having a high grinding ratio (light weight and long grinding stone life) are used for the abrasive grain layer 51 and have an appropriate spring constant. Since the rotary grindstone 20 integrated with the thin disk 52 is pressed against the metal roll 100 while rotating, the vibrating metal roll can be ground correctly for a long time without causing chattering due to resonance.

Superabrasive grains have good thermal conductivity and are suitable for releasing grinding heat. Further, a thin disk 52 that supports superabrasive grains to facilitate the escape of grinding heat is made of aluminum or an alloy thereof, and the thin disk 52 made of this aluminum or an alloy has an elastic body function to rotate. The whetstone 20 can perform many functions with a simple structure.

With respect to the arrangement of the rotary grindstone 20, the thin disk 52 does not effectively exert its elastic function by being positioned near the string AB where the contact line between the abrasive grain layer 52 and the metal roll 100 is inscribed. As mentioned above. By the way, the abrasive layer 5
Since 1 has a ring shape, if the contact line is the grindstone rotating shaft 21
When the rotary grindstone 20 is arranged so as to match the axis of
Two contact lines between the abrasive grain layer 51 and the metal roll 100 are formed on both sides of the center of the grindstone. When the contact force is formed at two places in this way, grinding is performed at the two places at the same time. Therefore, if there is a step on the metal roll 100, the two ground surfaces interfere with each other to cause a chattering phenomenon. Since they are in contact with each other, it is difficult to control the contact force between the rotating grindstone and the metal roll. By arranging the rotary grindstone 20 as in this embodiment, the contact line is formed at one location on one side of the center of the grindstone.
The chattering phenomenon is prevented and the contact force can be controlled appropriately.

Furthermore, by setting the contact line between the abrasive grain layer 51 and the metal roll 100 near the inscribed string AB,
As shown in FIG. 5, even if the grindstone width GL of the abrasive grain layer 51 in the radial direction is reduced, a long contact line W can be obtained. The long contact line W enables stable grinding.

Next, the roll profile grinding control function and the roll profile measurement function by the contact force control and the load control of this embodiment will be described.

During grinding of the metal roll 100, the rotary grindstone 20
The contact force between the metal roll 100 and the metal roll 100 is measured by the load cell 53, the load of the drive motor 54 is measured by the current system 54a, the feed amount of the feed motor 57 (feed position of the rotary grindstone 20) is measured by the encoder 57a, and the rotary grindstone is measured. The position of the roll 20 in the roll axis direction is measured by the encoder 58b, and each signal is transmitted to the information processing device 8.

The arithmetic processing unit 8 controls the contact force detected by the load cell 53 by the feed motor 57 on the basis of the relationship between the contact force F and the grinding amount Q stored in advance, and feeds it so as to obtain the desired grinding amount. The motor 57 changes the amount of bending of the thin disk 52 to control the contact force F. Thereby, the grinding amount is controlled, and the metal roll 100 can be ground into a predetermined profile.

Further, by controlling the feed motor 57 so as to keep the contact force between the abrasive grain layer 20a and the metal roll 100 constant, it is possible to grind all the cylindrical portion of the metal roll by the same size. That is, the original profile can be maintained and the entire length can be ground. Further, when the contact force is controlled to be constant and the moving speed (traverse speed) of the abrasive grain layer 20a in the roll axis direction is changed, the grinding amount is changed. Abrasive layer 20
If a is moved quickly, the contact time of the abrasive grains at the same position will be shortened and the amount of grinding will be reduced. If you move it slowly, the amount of grinding increases on the contrary. Therefore, with the load kept constant, the traverse motor 5
The grinding amount of the metal roll 100 can be adjusted by controlling the traverse speed of the abrasive grain layer 20a at 8 to grind to a desired roll profile.

Further, since the contact force F and the load of the drive motor 54 for rotating the rotary grindstone 20 have a constant relationship, instead of detecting the contact force F, the load of the drive motor 54 is detected and this load is controlled. However, the grinding amount Q can be changed. Specifically, the current value of the drive motor 54 is detected by the ammeter 54a, and when grinding a large amount, the feed device 23 controls the current value so as to increase the current value and adjusts the grinding amount. In addition, the feed motor 5 keeps the current value constant.
By controlling 7, it is possible to grind only the same size over the entire cylindrical portion of the metal roll. That is, the original profile can be maintained and the entire length can be ground. Further, when the current value of the drive motor 54 is controlled to be constant and the moving speed (traverse speed) of the abrasive grain layer 20a in the roll axis direction is changed, the grinding amount is changed. If the abrasive grain layer 20a is moved quickly, the abrasive grain contact time at the same position is shortened and the grinding amount is reduced. If you move it slowly, the amount of grinding increases on the contrary. Therefore, by controlling the traverse speed of the abrasive grain layer 20a by the traverse motor 58 while keeping the load constant, the metal roll 10
A grinding amount of 0 can be adjusted to grind to a desired roll profile.

Next, when the contact force between the abrasive grain layer 20a and the metal roll 100 is controlled by the feeding device 23 as described above,
If there is play in the axial direction of the grindstone rotating shaft 21, the metal roll 1
The movable mass that moves back and forth due to the vibration of 00 increases at once. At this time, the change in the contact force between the rotary grindstone 20 and the metal roll 100 is F = m × α, and if the acceleration α is the same, the change in the contact force also increases as the movable part mass m increases. When the change in the contact force becomes large as described above, it becomes difficult to control the contact force or the load by the feeding device 23, and the change in the contact force becomes the impact force generated in the abrasive grain layer 20a, and the abrasive grain layer 20a
It will quickly accelerate wear and cause chatter marks.
In this embodiment, in order to minimize the backlash,
A backlashless type preload type ball screw 56 is used for the feeding device 23, and other sliding parts also use parts with a small gap. The feed motor 57 that drives the ball screw 56 is an electric motor. As a result, the feeding device 2
It becomes easier to control the contact force in 3 and the rotating grindstone 2 during grinding
It is possible to hold the position of 0 and feed the rotary grindstone 20 in minute forward and backward directions. Further, the mass of the movable portion other than the rotary grindstone that is affected by vibration can be reduced to 0, and the impact force generated on the rotary grindstone 20 can be reduced.

The method of measuring the roll profile of the metal roll 100 is as follows. The rotating grindstone 20 is pressed against the rotating metal roll 100 by using the feed motor 57 and the ball screw mechanism 56, and the thin plate disk 52 is bent by a certain amount. The driving of the feed motor 57 is stopped, the feeding device 23 is fixed, the contact force between the rotary grindstone 20 and the metal roll 100 is measured by the load cell 53, and the measured value is stored in the information processing device 8.

Subsequently, the rotating grindstone 20 is moved in the axial direction of the metal roll 100 by the traverse motor 58, the moving amount is measured by the encoder 58a, and the rotating grindstone 2 is moved.
0 and the change of the contact force between the metal roll 100 and the load cell 5
3 and stores these measured values in the information processing device 8.

Here, since the spring constant K of the thin disk 52 is already known, the bending amount δ1 of the thin disk 52 is calculated from the contact force F1 obtained above by the following equation.

Δ1 (mm) = F1 (Kg) ÷ K (Kg / mm) Since the contact force (F) is continuously obtained by moving the rotary grindstone 20, δn (mm) = Fn (Kg) ÷ K (Kg / mm).

When δn is plotted in relation to the axial movement position of the metal roll 100, it becomes the profile of the metal roll 100. Abnormal irregularities due to the seizure also appear as a change in contact force and can be found in the profile measurement.

In another method, while controlling the feed motor 27 so that the contact force between the rotary grindstone 20 and the metal roll 100 is constant, the rotary grindstone 20 is moved in the axial direction of the metal roll 100.
To move. The movement amount of the rotary grindstone 20 in the feed direction is obtained from the information of the encoder 57a at this time, and the movement amount S
If n is plotted in relation to the axial movement position of the metal roll 100, it will be the profile of the metal roll 100.

[0073]

According to the present invention, since the vibration of the roll is absorbed by the elastic body function of the thin disk of the rotary grindstone, the roll can be ground online without causing chattering and resonance. For this reason, it is possible to make the rolls that convey strip-shaped products such as steel plates and papers flaws and to make the roughness of the roll surface uniform, and always maintain the roll surface in an optimum state.
This gives surface flaws to the surface of thin steel plates and papers,
It can be transported without affecting the surface gloss of papers, improving product quality.

Further, since the superabrasive grains are used in the abrasive grain layer of the rotary grindstone, the weight of the movable portion of the grindstone can be reduced and the resonance can be prevented more effectively. In addition, the life of the rotary whetstone is extended,
The productivity of the equipment can be improved.

Further, since the ball screw mechanism or the gear mechanism having a small backlash is used for the feeding device, the spring constant of the feeding mechanism becomes high, and the chattering phenomenon due to the looseness of the feeding mechanism can be prevented.

Further, since the grinding amount is changed by changing the contact force between the rolling roll and the rotary grindstone or the load of the driving device, the roll can be ground to an arbitrary profile.

Furthermore, since the roll profile can be measured, it can be effectively used as a monitor for managing the equipment.

Further, since the rotary grindstone is arranged so as to come into contact with the roll at one place near the string inscribed in the annular abrasive grain layer, the elastic body function of the thin disk is effectively exhibited. Also,
Since the contact line between the abrasive grain layer and the roll is at one place, the chattering phenomenon is further suppressed, and a long contact line is obtained, so that stable grinding is possible.

[Brief description of drawings]

FIG. 1 is a schematic view of equipment equipped with a roll surface grinding apparatus according to an embodiment of the present invention.

FIG. 2 is a top view of the roll surface grinding apparatus of this embodiment.

FIG. 3 is a sectional side view of a main part of the roll surface grinding apparatus of the present embodiment.

FIG. 4 is a view showing the arrangement and structure of a rotary grindstone and its vibration absorbing action.

FIG. 5 is a diagram illustrating a contact line between a rotary grindstone and a metal roll.

FIG. 6 is a diagram illustrating a control system of the roll surface grinding device according to the present embodiment.

[Explanation of symbols]

 7: Control device 8: Information processing device 14: Rack 20: Rotating grindstone 21: Grindstone rotating shaft 22: Driving device 23: Feeding device 24: Traverse device 51: Abrasive grain layer 52: Thin disk 53: Load cell 54: Driving motor 54a : Ammeter 56 Ball screw mechanism 57: Feed motor 57a: Encoder 58: Traverse motor 58b: Encoder 100 Metal roll 101 Unwinding device 103 Roll surface grinding device 107 Sliding rail 108 Grinding unit

Claims (8)

[Claims] 1. A disk-shaped rotary grindstone for grinding the surface of a roll for continuously moving strip-shaped materials such as thin steel plates and papers,
A drive device for rotating this rotating grindstone by a grindstone rotating shaft,
In a roll surface grinding apparatus having a traverse device that moves the rotating grindstone to the roll and the rotating grindstone in the axial direction of the roll, the rotating grindstone is a thin disk attached to the grindstone rotating shaft, A roll surface grinding apparatus comprising: an abrasive grain layer fixed to a side surface of the thin plate disk with respect to the roll surface, and the thin plate disk having an elastic body function for absorbing vibration from the roll. 2. The roll surface grinding device according to claim 1, wherein the abrasive grain layer contains superabrasive grains such as cubic boron nitride abrasive grains and diamond abrasive grains. 3. The roll surface grinding apparatus according to claim 1, wherein the feeding device converts a rotary drive source and rotation of the rotary drive source into axial movement of the rotary drive shaft to roll the rotary grindstone. A roll surface grinding device having a ball screw mechanism or a gear mechanism with a small backlash that moves back and forth with respect to the roll surface grinding device. 4. The roll surface grinding apparatus according to claim 1, wherein load detecting means for measuring a contact force between the rotary grindstone and the roll, and contact force measured by the load detecting means are controlled by the feeding device. A roll surface grinding apparatus further comprising: a control unit that adjusts a grinding amount of the roll by the rotating grindstone and grinds the roll into a predetermined profile. 5. The roll surface grinding apparatus according to claim 1, wherein load detecting means for measuring a load of a driving device for rotating the rotary grindstone, and load measured by the load detecting means are controlled by the feeding device. And a controller for adjusting the grinding amount of the rolling roll by the rotary grindstone to grind the rolling roll into a predetermined roll profile. 6. The roll surface grinding apparatus according to claim 1, wherein load detecting means for measuring a contact force between the rotary grindstone and the roll, and moving amount detection for measuring a moving amount of the rotary grindstone in a roll axial direction. Means for calculating the profile of the roll from the contact force measured by the load detecting means and the moving amount measured by the moving amount detecting means by driving the traverse device while keeping the position of the feeding device constant. A roll surface grinding apparatus further comprising means. 7. The roll surface grinding apparatus according to claim 1, wherein a load detecting means for measuring a contact force between the rotary grindstone and the roll, and a first means for measuring a moving amount of the feeding device.
Moving amount detecting means, a second moving amount detecting means for measuring the moving amount of the rotary grindstone in the roll axis direction, and the traverse device is driven by keeping the contact force measured by the load detecting means constant. Roll surface grinding further comprising profile calculating means for obtaining a profile of the roll from the movement amount measured by the first movement amount detecting means and the movement amount measured by the second movement amount detecting means. apparatus. 8. The roll surface grinding apparatus according to claim 1, wherein the abrasive grain layer has an annular shape, and the rotary grindstone is attached to the roll at a location near a string inscribed in the annular abrasive grain layer. A roll surface grinding device, which is arranged so as to be in contact with each other.