JP2870357B2 - Rotary grinding wheel for online roll grinding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an online roll grinding apparatus provided in a rolling mill, and more particularly to a rotary grinder for an online roll grinding apparatus that performs excellent roll grinding without being affected by the vibration of a rolling roll. .

[0002]

2. Description of the Related Art Generally, when a slab material is rolled by a rolling roll of a plate rolling mill, only a rolled portion is worn and a step is generated from a non-rolled portion. Since a step is generated in the rolling roll as described above, it is necessary to restrict rolling conditions, for example, rolling from a wide slab to a narrow slab in order.

[0003] In order to solve this problem, many techniques relating to an online roll grinding apparatus have been proposed.

For example, Japanese Utility Model Application No. 56-122232 (Japanese Utility Model Application Laid-Open No. 58-2)
The microfilm of No. 8706) has an abrasive layer made of superabrasive grains on a cup-type grindstone, and an elastic body is provided on the back of the grindstone to absorb the vibration of the rolling roll, and the grindstone moves back and forth. A spline is provided between the grindstone rotating shaft and the grindstone so that it can be performed (hereinafter, referred to as a first conventional technique).

Further, Japanese Patent Application Laid-Open No. 4-201171 proposes using CBN abrasive grains for a cylindrical grindstone of a roll mill, and the surface layer of the cylindrical grindstone is formed of CBN abrasive grains, and CBN abrasive grains are formed. A ring-shaped elastic layer is integrally formed between the abrasive grains and the base metal. The elastic layer is made of a thermosetting phenol resin. (Hereinafter, referred to as a second conventional technique.)

[0006]

However, in the first prior art, the weight of the movable portion of the grindstone is increased, and there is a problem as described below.

For example, when CBN abrasive grains are used for the grindstone and the grindstone diameter is 250 mm, the weight of the movable part supported by the elastic body and moving back and forth becomes at least 5 kgf including the grindstone, the slide bearing, and the seal portion.

Further, the spring constant of the elastic body must be 130 kgf / mm if the allowable contact force change between the roll and the grindstone is 4 kgf and the amplitude is 30 μm.

Under these conditions, the natural frequency Fn of the elastic body is 80 c / s from Equation 1.

[0010]

Fn = 1 / 2π × √K / M where K is the spring constant of the elastic body, and M is the weight of the grindstone including the elastic body.

At this natural frequency, the elastic body including the grindstone resonates due to the vibrations of the rolling mill, causing chatter marks on the rolls, and the grindstone is more worn.

On the other hand, if the diameter of the grindstone is reduced and the weight of the movable part is reduced, the grinding ability is greatly reduced.

[0013] Further, the cup-type grindstone is movable in the axial direction, and the back surface of the grindstone is supported by an elastic body. However, cooling water and grinding debris are scattered around the grindstone during roll grinding.
These penetrate into the gap between the grindstone and the rotary grindstone from the seal portion attached to the vibrating grindstone, thereby preventing smooth movement of the grindstone and making it difficult to stably perform the function of the elastic body for a long time.

In the second prior art, as described above, in the off-line roll grinding device, in order to absorb the wobble of the grindstone and reduce the change in the contact linear pressure, the gap between the CBN abrasive grain layer and the base metal is reduced. A ring-shaped elastic body is integrally formed.

However, in the case of a cylindrical grindstone, it is difficult to provide an elastic member having an appropriate spring constant because the axis of the rolling roll and the grindstone rotation axis are linear.

In the second prior art, the elastic layer provided between the CBN abrasive grain layer and the base metal has a strength to transmit the rotational force of the grinding wheel rotating shaft to the outer peripheral abrasive grain layer. Need. For this reason, the elastic layer is made of a thermosetting phenolic resin.

A first object of the present invention is to provide a rotary grinding wheel for an online roll grinding apparatus capable of absorbing vibrations from a rolling roll and generating a chatter phenomenon without causing a chatter phenomenon, and capable of grinding accurately and with a good roll roll surface roughness. It is in.

A second object of the present invention is to provide an online roll grinding apparatus capable of performing more accurate grinding in a situation where the rotation speed of a rolling roll to be grounded is different when the online roll grinding apparatus is attached to a continuous hot rolling facility. An object of the present invention is to provide a grinding wheel.

[0019]

According to the present invention, there is provided a grinding wheel for an on-line roll grinding apparatus for grinding a rolling roll installed in a rolling mill. Comprises a disk-shaped member, and an abrasive layer made of superabrasive particles disposed on the surface of the disk-shaped member, and further, the disk-shaped member has a flexible elastic body function , The disc-shaped member has an elastic body function.
And set the spring constant in the range of 1000 kgf / mm to 30 kgf / mm.
It is in the box .

[0020]

Alternatively, the first object of the present invention is achieved.
In the present invention, the rolling roll installed in the rolling mill
Grinding wheels for online roll grinding equipment
The grinding wheel comprises a disk-shaped member and the disk-shaped member.
And an abrasive layer made of superabrasives disposed on the surface of the member.
The disk-shaped member is provided with a flexible elastic body function.
Using cubic boron nitride abrasive grains as super abrasive grains in the abrasive grain layer
The concentration of the abrasive grains is in the range of 50 to 100,
The particle size is in the range of 80 to 180 .

In addition, a resinoid bond is used as a binder for binding the cubic boron nitride abrasive grains used for the abrasive grain layer.

[0023]

In order to achieve the object of the second invention, according to the present invention, there is provided a rotary mill for an online roll grinding apparatus provided in each of a plurality of rolling mills constituting a hot rolling facility.
A rotating stone for an online roll grinding device, wherein a grinding wheel is provided with an abrasive layer made of superabrasive grains on one side surface of a disk-shaped member made of metal or resin , wherein the disk-shaped member has an elastic body function. In order to absorb the vibration from the rolling roll to have, among the rolling mills constituting the hot rolling equipment,
The spring constant of the disc-shaped member of the online roll grinding device provided in front of the rolling mill and the soft spring constant, the spring constant of the disc-shaped member of the online roll grinding apparatus disposed downstream of the rolling mill of the front stage The spring constant is higher than that of the rolling mill.

[0025] Preferably, the rotating wheel axis of an online roll grinding device provided in each of the rolling mills, the inclination of a perpendicular core with respect to the axis of the rolling roll, and the disc-shaped portion
In consideration of the inclination due to the deflection in the range of use of the material, the inclination of the rotating wheel grinding surface of the online roll grinding device is determined, and the rotating wheel grinding surface is inclined with respect to the rolling roll based on the determined inclination. It is the one that has.

The grinding wheel is adjusted by off-line truing so as to have the determined inclination of the grinding wheel.

[0027]

[Function] The rolling roll is 10 to 15 depending on the rolling speed.
It vibrates while having a frequency of 0 c / s. When a rigid grinding wheel is pressed by an elastic body such as a spring, air, or a hydraulic cylinder in a roll grinding device provided in a rolling mill to perform grinding, the elastic body tends to absorb the inertial force of the rolling roll.

According to the first prior art,
Since the elastic body is behind the grindstone, inertial force acts on the contact portion between the grindstone and the rolling roll, and the force causes the metal at the tip of the roll and the abrasive grains to grind while colliding. Such discontinuous grinding causes a chatter phenomenon, the surface roughness of the rolling roll is deteriorated, and the wear of the grindstone is also very fast.

In order to follow the movement of the rolling roll and to reduce the change in the contact force between the rolling roll and the grindstone on the grinding surface, a spring or a grinding device is provided. It is necessary to provide the grindstone itself with an elastic function without absorbing it with a cylinder such as hydraulic or pneumatic.

Here, when an elastic body is provided on the grindstone, in the case of a cylindrical grindstone, the rolling roll, the grindstone rotating shaft and the grindstone are arranged in a straight line, and it is difficult to provide an elastic member. On the other hand, in the case of a rotating disk-shaped grindstone, the axis of the rolling roll and the rotating grindstone axis are almost perpendicular to each other, so that the grinding point of the grindstone and the rotating shaft that fixes the grindstone have a relationship like a cantilever beam, It becomes easy to provide an elastic member between them.

As shown in FIG. 3, in the case of a rotating disk-shaped grinding wheel for instantly absorbing the vibration of the rolling roll, if a disk-shaped member integrated with the grinding wheel is provided with an elastic body function, the rotation from the rolling roll is reduced. Due to the vibration of the disk-shaped member , the disk-shaped member is bent, and the vibration can be easily absorbed by the bending of a part of the grindstone in contact with the rolling roll and the disk-shaped member .

As described above, in the first invention, since the disk-shaped member of the rotary grindstone for the online roll grinding device has an elastic body function, the vibration near the grinding surface of the rolling roll and the rotary grindstone is provided. Energy can be absorbed, and the movable mass that moves with the acceleration of the rolling roll vibration can be minimized, thereby reducing the fluctuation of the contact pressure between the rotating wheel and the rolling roll.

Further, based on the frequency and amplitude conditions of the rolling roll, the disk-shaped member having the elastic body function is provided with an appropriate range of spring constant, and an optimum one is selected to absorb the vibration of the rolling roll. Thus, the rotating grindstone can always follow the rolling roll, and correct grinding without chatter can be performed.

If the disk-shaped member is provided with an elastic body function, the vibration of the rolling roll may cause the disk-shaped member to generate resonance. To prevent this, the disk shape
It is necessary to separate the resonance point of the member from the frequency of the rolling roll. That is, from the above formula 1, the resonance point of the disc-shaped member can be increased by reducing the mass of the movable portion.

Generally, a grindstone made using cubic boron nitride abrasive grains has a grinding ratio of more than 300 even when a rolling roll is ground, and is 100 times or more that of a grindstone using aluminum oxide or silicon carbide-based abrasive grains. Grinding ratio.

That is, in the present invention, the use of cubic boron nitride abrasive grains as the superabrasive grains in the abrasive grain layer enables grinding for a long time with a grindstone having a small weight.

In addition, since the grinding is performed online, the superabrasives must maintain a constant grinding performance for a long time without using a method such as dressing. When the density of superabrasive grains contained in the grindstone layer of the grinding wheel, that is, the degree of concentration is 50 or less, the load applied to the superabrasive grains is large, and the superabrasive grains are worn to shorten the life of the grinding wheel. On the other hand, when the degree of concentration is 100 or more, the load applied to the superabrasive grains is small, and it is difficult for the superabrasive grains themselves to generate spontaneous cutting. For that purpose, the density of superabrasive grains contained in the grindstone layer, that is, the degree of concentration needs to be 50 to 100.

The superabrasive grains contained in the grinding wheel layer of the grinding wheel are worn by grinding, and the amount of the superabrasive grains protruding from the surface of the binder is reduced. If a resinoid bond is used as the binder, the superabrasive grains are worn together with the superabrasive grains while being retained, and the protruding amount of the superabrasive grains can always be secured to some extent.

The surface roughness of the rolling roll was changed from Ra 0.3 to 1.5.
From the necessity of grinding to μm, the size of the superabrasive grains 12a,
In other words, since the particle size needs to be from 80 to 180, the degree of concentration of the superabrasive particles is set in the range of 50 to 100, and the particle size of the superabrasive particles is set in the range of 80 to 180. Using a resinoid bond as a binder that binds the cubic boron nitride abrasive used in the layer, sufficient spontaneous cutting is performed without dressing the rotating grindstone, and the roll surface roughness is suitable for rolling. Can be ground to roughness.

[0040]

In the case of a continuous rolling facility, the rolling rolls rotate at different speeds for each rolling stand. Among the rolling mills constituting the hot rolling equipment, the rolling rolls of the preceding rolling mill rotate at a low speed, and rotate at a high speed as the rolling mill of the subsequent stage becomes.

However, when grinding the rolling roll online, the speed of the non-grinding body cannot be arbitrarily selected. In particular, when the number of rotations of the rolling roll increases, a water film is formed between the rolling roll and the rotating grindstone due to the effect of the cooling water, and this water film becomes a force for separating the rolling roll and the rotating grindstone. Also, as the rolling roll of the subsequent rolling mill becomes, the coil 1
The amount of wear per book increases, and the required amount of grinding increases accordingly.

In the first invention, the spring constant of the rotary grindstone is determined so that an appropriate grinding ability can be exhibited under these conditions.

[0044] That is, the spring constant of the disc-shaped member of the online roll grinding device provided in front of the rolling mill and the soft spring constant, of the disc-shaped member of the online roll grinding apparatus disposed downstream of the rolling mill spring The constant is made to have a spring constant which is harder than that of the preceding rolling mill.
Accordingly, by changing the spring constant of the disc-shaped member in accordance with the peripheral speed of the rolling roll of each rolling stand, vibration from the rolling roll can be absorbed, and more accurate grinding can be performed.

[0045] Further, since the disk-like member used in the rotary grindstone has an elastic body, the disc in pressing force for grinding
The shape member is bent.

According to a third aspect of the present invention, the inclination of the rotating wheel shaft of the online roll grinding device provided in each of the rolling mills, the inclination of the perpendicular core with respect to the axis of the rolling roll, and the range of use of the disc-shaped member are described. Since the inclination of the rotating wheel grinding surface of the online roll grinding device is determined in consideration of the inclination due to bending, and the rotating wheel grinding surface is inclined with respect to the rolling roll based on the determined inclination. The rotating grindstone grinding surface and the rolling roll can be brought into contact over the entire surface of the rolling roll with a predetermined pressing force.

Since the determined inclination of the grinding wheel of the rotary grindstone is adjusted by off-line truing, accurate setting is possible.

[0048]

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

FIG. 4 is a plan view of a rolling mill provided with an online roll grinding device. A rolling mill provided with the rolling rolls 3 is provided with two online roll grinding devices 5 for flattening wear of the rolling rolls 3.

The online roll grinding device 5 is movable along a slide rail 53, and includes a rotary grinding wheel 1 and a driving device 54 for driving the same.
And a traverse motor 52 for moving the on-line roll grinding device 5 in the axial direction of the rolling roll.

Here, the rotary grindstone 1 of the online roll grinding device 5 will be described.

FIG. 1 is a cross-sectional view of the rotary grindstone 1 of the online roll grinding device 5, and FIG. 2 is a front view of FIG.
FIG.

The rotary grindstone 1 is composed of an abrasive layer 12 made of superabrasive grains and a thin disk-shaped base metal 11 supporting the abrasive layer 12. The rotating grindstone 1 is rotated by receiving a driving torque from the rotating grindstone shaft 2.

The abrasive layer 12 is made of superabrasive grains 12a serving as grinding cutting blades and a binder 12b for holding the superabrasive grains 12a.

As described above, the rolling roll 3 rotates while having a certain vibration. Therefore, in order to absorb the vibration of the rolling roll 3 and perform the grinding properly, the thin disk-shaped base metal 11 of the rotating grindstone 1 has an elastic body function. Then, the elastic body function of the thin disk-shaped base metal 11, that is, whether the spring constant is appropriate for the vibration of the rolling roll 3 becomes a problem.

Next, an appropriate spring constant of the thin disk-shaped base metal 11 constituting the rotary grindstone 1 will be described.

FIG. 5 is experimental data showing the relationship between the spring constant of the rotary grinding wheel 1 and the grinding ratio. It can be seen that when the spring constant is large, the grinding ratio decreases, and when the spring constant decreases, the grinding ratio increases. That is, when the spring constant is large, chatter marks are formed, the grinding ratio is deteriorated, and the rotating grindstone 1 is worn away quickly.

If the rotary grindstone 1 is worn out quickly, the frequency of replacement of the rotary grindstone 1 increases, and the productivity of the rolling operation decreases. In order to prevent the productivity of the rolling operation from lowering, it is necessary to reduce the frequency of replacement of the rotating grindstone 1, and it is desirable that the rotating grindstone 1 can be continuously ground for 5 days or more. For this purpose, generally, a grinding ratio of 50
The above is necessary.

Since the rotary grindstone 1 made of the superabrasive grains 12a is expensive, the grinding ratio must be as high as possible to reduce the production cost.

When the spring constant of the thin disk-shaped base metal 11 is large, the grinding ratio decreases because the fluctuation of the contact force generated on the rotating grindstone 1 by the vibration of the rolling roll 3 increases. This is because a large force acts and the abrasive grains 12a fall out of the holding force of the binder 12b.

If the spring constant of the thin disk-shaped base metal 11 is large, the vibration of the rolling roll 3 cannot be absorbed by the rotating grindstone 1. For this purpose, although not shown, the load is transmitted to a load cell that is provided in an online roll grinding device and measures the contact force between the rolling roll 3 and the rotary grindstone 1, and the measured value of the contact force on the load cell Fluctuations are increased. Therefore, it is difficult to control the amount of grinding by the contact force between the rolling roll 3 and the rotating grindstone 1.

On the other hand, when the spring constant is reduced, the fluctuation of the contact force generated on the rotating grindstone 1 due to the vibration of the rolling roll 3 is reduced, so that the grinding ratio is increased, but the grinding control and the roll profile measurement accuracy are reduced. The reason why the roll profile measurement accuracy is reduced is that even when the rotating grindstone 1 is bent, small irregularities cannot be detected because the force acting on the grindstone rotating shaft 2 is small.

For example, assuming that the spring constant of the thin disk-shaped base metal 11 is 50 kgf / mm, the load difference caused by the step of 10 μm is ΔF = 50 × 0.01 = 0.5 (kgf), and the load of the general load cell 53 is Judging from the resolution, it is close to the limit.

The small spring constant of the thin disk-shaped base metal 11 means that the thin disk-shaped base metal 11 is thin, and the amount of deflection of the rotary grindstone 1 increases due to the contact force. If the constant is less than 30 kgf / mm, a crack occurs in the thin disk-shaped base metal 11 due to the contact force required for grinding.

Further, when the spring constant is smaller than 30 kgf / mm, the amount of deflection of the thin disk-shaped base metal 11 increases, and the abrasive layer 12
6 (a) to 6 (c), the contact linear pressure becomes concentrated linear pressure due to the pressing force (FIGS. 6 (a) and 6 (c)), and the distribution line Pressure (FIG. 6B).

When the pressure becomes a concentrated linear pressure, as shown in FIG. 6 (a), the grinding ability is increased even if the pressing force of the rotary grindstone 1 is small, and conversely, the pressing force is increased as shown in FIG. 4 (b). In the case of the distribution linear pressure, the grinding force is reduced although the pressing force is increased. Further, when the pressing force is increased, a concentrated linear pressure is formed as shown in FIG. 4C, but the grinding ability is extremely increased. Therefore, the relationship between the pressing force and the grinding ability becomes unstable, and it becomes difficult to control the grinding ability by the contact force between the rolling roll 3 and the rotating grindstone 1, that is, the pressing force of the rotating grindstone 1.

As described above, the thin disk-shaped base 1
The spring constant of 1 is preferably between 1000 kgf / mm and 30 kgf / mm, and more preferably the spring constant is between 500 kgf / mm and 50 kgf / mm.

If the mass of the abrasive layer 12 attached to the thin disk-shaped base metal 11 having such a small spring constant is not reduced, the natural frequency of the thin disk-shaped base metal 11 decreases and resonates with the rolling rolls. There is fear. For that purpose, the mass of the grindstone attached to the thin disk-shaped base metal 11 must be reduced.

Aluminum oxide (Al ₂ O ₃ ) or silicon carbide (SiC) generally used as a grindstone
In the case of whetstones using system-based abrasive grains, if the mass of the movable part of the whetstone and the boss supporting the whetstone is reduced, the whetstone will be quickly consumed,
It is necessary to change the grinding wheel many times a day, which greatly impairs the effect of the rolling mill in the rolling mill.

In order to solve this problem, a super-abrasive having a high grinding ratio (reduced volume of the workpiece / reduced volume of the grindstone), that is, a grindstone layer made of cubic boron nitride (CBN) is used. Is necessary for a rotary grinding wheel for an online roll grinding device. A grinding layer made using superabrasives has a high grinding ratio even when grinding a rolling roll, and therefore has a sufficient grinding time with a small weight. If the grindstone layer made of the superabrasive grains is used as a rotating grindstone of an online roll grinding device, grinding can be performed for a long time with a small weight.

In the online roll grinding apparatus, dressing of the grinding wheel layer 12 of the grinding wheel 1 is usually performed in order to stabilize the grinding ability and the grinding roughness. However, in the case of an online roll grinding device, it is difficult to dress the grinding wheel layer 12 due to a space problem or the like.

Accordingly, in order to stabilize the grinding roughness without dressing in online grinding and stabilize the grinding roughness, it is necessary for the superabrasive grains 12a to spontaneously sharpen at a constant speed. In order for the superabrasive grains 12a to appropriately spontaneously generate a blade, the load applied to one superabrasive grain 12a may be adjusted.

The super-abrasive grains 12 contained in the grinding layer of the grinding wheel 1
When the density of a, that is, the degree of concentration is 50 or less,
The load on a is large, the superabrasive grains 12a are worn, and the life of the grinding wheel 1 is shortened.

On the other hand, when the degree of concentration is 100 or more, the load applied to the superabrasive grains 12a is small, and it is difficult for the superabrasive grains 12a themselves to generate spontaneous cutting.

For this purpose, the density of superabrasive grains 12 a contained in the grindstone layer 12, that is, the degree of concentration, needs to be 50 to 100.

The superabrasive grains 12a contained in the grindstone layer of the grinding wheel 1 are worn by grinding, and the amount of the superabrasive grains 12a protruding from the surface of the binder 12b is reduced. Binder 12b
For example, when vitrified is used, since the vitrified hardly wears, the protruding amount of the superabrasive grains 12a is reduced, and finally the protruding amount is reduced and the grinding becomes impossible.

Accordingly, it is necessary to always maintain a certain amount of protrusion of the superabrasive grains 12a while holding the superabrasive grains 12a by using a binder 12b which is worn together with the wear of the superabrasive grains 12a. As a binder having such properties,
Resinoid bonds are optimal.

With the concentration and the binder 12b as described above, the superabrasive grains 12a are easily spontaneously generated and can be continuously ground without dressing.

The surface roughness of the rolling roll 3 was Ra 0.3.
From the necessity of grinding to 1.5 μm from super abrasive 12a
, That is, the particle size must be from 80 to 180. Next, the rotary grindstone 1 when the online roll grinding device 5 is attached to a rolling mill constituting a continuous hot rolling facility
Will be described.

The rolled material S
Is passed, only the threaded portion of the rolled material S of the rolling roll 3 is worn. In order to remove a step formed in the rolling roll 3, it is desirable to provide an online roll grinding device in all rolling stands.

When the online roll grinding device 5 is provided in all rolling stands, more accurate grinding can be performed by appropriately selecting the spring constant of the rotary grindstone 1 for each stand.

In the hot rolling equipment, the direction in which the rolled material S enters is referred to as the entry side, and the direction in which the rolled material S exits is referred to as the exit side. The rolled material S is gradually rolled from the entry side, and moves faster as it becomes thinner. Therefore, the rolling roll 3 is rotating at a high speed from the entry side to the exit side.

FIG. 7 shows a hot continuous rolling equipment provided with an online roll grinding device 5. In the case of this hot continuous rolling equipment, usually, the rotation speed of the final stand F6 is about 1200
m / min, and the rotation speed is higher than 600 rpm. The rolling roll 3 is provided with a coolant header 6 for applying cooling water to remove heat from the rolled material S. Therefore, the rolling roll 3 has a water film around it and rotates at a high speed.

In general grinding, the rotation speed of the non-ground material is said to be about 1/100 of the grinding speed of the grindstone. However, a non-ground material, that is, the rotation speed of the rolling roll 3 cannot be restricted for grinding online, and the high speed rolling roll 3 must be ground particularly at the delivery side stand.

When the high-speed rolling roll 3 is to be ground, cooling water enters between the rolling roll 3 and the rotating grindstone 1, and the high-speed moving cooling water causes the rotating grindstone 1 to rotate.
And the rolling roll 3.
For this reason, the pressing force of the rotary grindstone 1 at the output side stand needs to be a combined force of the force required for grinding and the force that can overcome the force generated by the cooling water pressure. You can't give it the ability. In the rotary grindstone 1 having the base metal 11 having a small spring constant, the bending of the thin disk-shaped base metal 11 becomes large, which leads to the destruction of the abrasive layer 12 and the separation of the abrasive layer 12 from the thin disk base metal 11.

Therefore, in the continuous hot rolling equipment, the spring constant of the rotary grindstone 1 attached to the outgoing stand from the incoming stand must be increased.

Next, the truing angle of the abrasive grain layer 12 of the rotary grindstone 1 will be described with reference to FIGS.

FIG. 8 is an explanatory view for explaining the truing angle of the abrasive layer when the bending of the thin disk-shaped base 11 of the rotary grinding wheel 1 is not taken into consideration. FIG. 9 is a diagram illustrating the thin disk-shaped base of the rotary grinding wheel 1. It is explanatory drawing for demonstrating the truing angle of an abrasive grain layer when the bending of the gold | metal 11 is considered.

The rolling roll 3 and the grindstone rotating shaft 2 are not perpendicular but inclined at a small angle in the roll radial direction. If the rotating grindstone 1 is a rigid body, the surface of the abrasive grain layer 12 becomes an inclined line Gf ₁ in consideration of the inclination θ degree of the grinding wheel rotating shaft 2 as shown in FIG. 8, and is parallel to the thin disk-shaped base metal 11. By giving the truing inclination angle θ ₁ to Gp ₁ , the surface of the abrasive layer 12 becomes the contact line Gf ₁ and comes into contact with the rolling roll 3 over the entire width of the contact surface.

However, the thin disk-shaped base 11 of the rotary grindstone 1
In the case where the elastic member function is provided, the truing must be performed in consideration of the bending of the thin disk-shaped base metal 11 as shown in FIG. The bonding surface of the thin disk-shaped base metal 11 and the abrasive layer 12 changes from Gp ₁ to Gp ₂ due to bending, and the angle between Gp ₁ and Gp ₂ is θ _2. The abrasive layer 12 is trued so that the angle θ ₃ is obtained by subtracting the relief angle θ ₂ due to the deflection from the truing inclination angle θ _{1 of the} layer 12, so that the abrasive layer 12 has an inclination angle. The relief angle θ ₂ due to the deflection is obtained by calculation, and the truing of the rotary grindstone unit 1 is performed in consideration of the calculated angle. Thereby, even when the thin disk-shaped base metal 11 of the rotating grindstone 1 has an elastic body function, the pressing force is applied over the entire surface,
The abrasive layer 12 and the rolling roll 3 can be brought into contact.

The above description is based on the assumption that the binder 12 b
Has been described on the premise that a resinoid bond that is cured by heat is used, but the binder itself has an elastic body function and super abrasive grains 12a.
The rotating grindstone 1 made of the hard rubber binder 12c, which can also have the function of holding the wheel, will be described.

FIG. 10 is a detailed explanatory view of a super-abrasive layer made of a hard rubber having an elastic body function. The hard rubber binder 12c is made of synthetic rubber such as NBR and super-abrasive. In order to prevent the abrasive grains from falling off, a ceramic-based fine filler (SiC, TiN, etc.) having a large Young's modulus is kneaded to produce an abrasive-containing compound for forming the abrasive layer 12.
The compound containing abrasive grains is compression-molded to a thickness that allows the amount of deflection necessary to absorb the vibration from the rolling roll 3.

The abrasive layer 12 thus produced is attached to the side surface of the rotating disk 14 made of a rigid body using an adhesive. Hard rubber obtained by adding a vulcanizing agent to natural rubber may be used. As described above, the elastic body function of the hard rubber binder 12c allows the rotating disk 14 supporting the abrasive grain layer 12 to have no elastic body function.
Correct grinding can be performed without an impact load acting on the superabrasive grains 12a.

[0094]

According to the first aspect of the present invention, the rolling row
Absorbs vibrations from the
On-line grinding that ensures reliable and good roll surface roughness
It is possible to provide a rotary grinding wheel for an in-roll grinding device.
This has the effect.

According to the second aspect of the present invention, the rolling roll
Accurate without absorbing vibration from vibration
In addition, it is possible to grind the roll surface with good surface roughness.
It is possible to provide a rotary grinding wheel for a roll mill
This has the effect of

According to the fourth aspect of the present invention, online
When a roll grinding device is installed in a continuous hot rolling facility,
More correct when the roll speed to be ground is different
Rotary grinding wheel for online roll grinding equipment that can perform accurate grinding
Is provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary grindstone provided in an online roll grinding device.

FIG. 2 is a front view of FIG. 1, showing a structure of a rotary grindstone provided in the online roll grinding device.

FIG. 3 is an explanatory diagram for explaining that a rotating grindstone absorbs vibration from a rolling roll.

FIG. 4 is a plan view of a rolling mill provided with an online roll grinding device.

FIG. 5 is experimental data showing the relationship between the spring constant of the rotary grindstone 1 and the grinding ratio.

6A and 6B are explanatory diagrams showing the relationship between the deflection of a thin disk-shaped base metal having an elastic body function and the contact pressure of an abrasive layer, and FIGS.
(C) is a figure which shows the relationship of the contact force of an abrasive grain layer and a rolling roll, respectively.

FIG. 7 is a view showing a hot continuous rolling facility provided with an online roll grinding device.

FIG. 8 is an explanatory diagram for explaining the truing angle of the abrasive grain layer when the bending of the thin disk-shaped base metal of the rotating grindstone is not considered.

FIG. 9 is an explanatory diagram for explaining the truing angle of the abrasive grain layer in consideration of the deflection of the thin disk-shaped base metal of the rotary grindstone.

FIG. 10 is an explanatory view of a superabrasive layer rotating grindstone made of hard rubber having an elastic body function.

[Explanation of symbols]

Reference numeral 1: rotating whetstone, 2: whetstone rotating shaft, 3: rolling roll, 4 ...
Reinforcement roll, 5: online roll grinding device, 11: thin disk-shaped base, 12: abrasive layer, 12a: superabrasive, 12b
... Binder, 13 ... Disc base, 52 ... Traverse motor, 53 ... Sliding rail, 54 ... Whetstone driving device.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References Japanese Utility Model 63-86961 (JP, U) Japanese Utility Model 63-762 (JP, U) Japanese Utility Model 63-186559 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) B24D 3/00 310 B24D 3/00 320 B21B 28/04 B24D 7/00

Claims (6)

(57) [Claims] 1. A grinding wheel for an online roll grinding device for grinding a rolling roll installed in a rolling mill, wherein the grinding wheel comprises a disc-shaped member and a super-disposed member disposed on the surface of the disc-shaped member. An abrasive layer made of abrasive grains, and further, the disc-shaped member has a flexible elastic function, and the elastic constant provided to the disc-shaped member has a spring constant of 1000 kg.
A rotating grindstone for an online roll grinding device, characterized in that the f / mm is in the range of 30 kgf / mm. 2. A grinding wheel for an online roll grinding device for grinding a rolling roll installed in a rolling mill, wherein the grinding wheel comprises a disk-shaped member and a super-disposed member disposed on the surface of the disk-shaped member. An abrasive layer made of abrasive grains, the disc-shaped member having a flexible elastic body function, and further using cubic boron nitride abrasive grains as super abrasive grains of the abrasive layer. The concentration of the particles is in the range of 50 to 100, and the particle size of the abrasive particles is 80.
A rotary grinding wheel for an online roll grinding device, characterized in that the range is from 180 to 180. 3. The rotary grinding wheel for an online roll grinding device according to claim 2, wherein a resinoid bond is used as a binder for binding the cubic boron nitride abrasive used in the abrasive layer. Rotary grinding wheel for online roll grinding equipment. 4. A rotary grindstone for an online roll grinding device provided in each of a plurality of rolling mills constituting a hot rolling facility, wherein one side of a disk-shaped member made of metal or resin is super-ground. In a rotary grindstone for an online roll grinding device provided with an abrasive layer made of grains, the disk-shaped member is provided with an elastic body function to absorb vibration from a rolling roll, and the hot rolling equipment is configured. Of the rolling mills, the spring constant of the disk-shaped member of the online roll grinding device provided in the preceding rolling mill is set to a soft spring constant, and the disk-shaped member of the online roll grinding device provided in the subsequent rolling mill. A rotary grinding wheel for an online roll grinding device, wherein a spring constant is set to be higher than that of the preceding rolling mill. 5. The rotary grinding wheel for an online roll grinding device according to claim 4, wherein a rotation wheel axis of an online roll grinding device provided in each of the rolling mills and an inclination of a perpendicular core with respect to the axis of the rolling roll. Determining the inclination of the rotating wheel grinding surface of the online roll grinding device in consideration of the inclination of the disk-shaped member due to deflection in the range of use, and rolling the rotating wheel grinding surface on the rolling roll based on the determined inclination. A rotary grinding wheel for an online roll grinding device, characterized in that the grinding wheel is inclined with respect to. 6. The grinding wheel for an online roll grinding device according to claim 5, wherein the grinding surface of the grinding wheel is adjusted by off-line truing so as to have the determined inclination of the grinding surface of the grinding wheel. Rotary grinding wheel for online roll grinding equipment.