JP3065767B2 - Four-high rolling mill and hot finish rolling method and equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-high rolling mill and a hot finishing rolling method and equipment, and more particularly, to a four-high rolling mill in which a work roll excellent in sheet crown control ability and shape control ability of a rolled material crosses. The present invention relates to a rolling mill and a hot finish rolling method and equipment using the rolling mill.

[0002]

2. Description of the Related Art Conventionally, a roll-cross type four-high rolling mill which has been put to practical use is disclosed in Mitsubishi Heavy Industries Technical Report Vol. 21, No.
6 (1984), pages 61-67,
A roll set of a pair of an upper work roll and an upper reinforcement roll and a roll set of a pair of a lower work roll and a lower reinforcement roll are integrally formed so that axes of the pair rolls are crossed in a horizontal plane.

Attempts to cross only the work rolls without crossing the reinforcing rolls are faster than pair cloths, for example, as described in JP-A-47-27159. Only the above-mentioned pair cloth method in hot rolling is used.

On the other hand, in order to enhance the shape control ability, a roll cross type rolling mill uses both a method of applying a bending force to the roll and a variable crown method of changing the roll crown by forcing a fluid into a space in the roll. Attempts to do so are described in JP-A-57-118804 and JP-A-57-25206. In these publications, the roll cross type rolling mill is
It has been proposed to dispose it on the downstream side (later stage) of a finish rolling stand where the plate thickness becomes thin and flatness needs to be ensured.

[0005]

In a pair-cross type rolling mill in which a work roll and a reinforcing roll are integrally crossed, the slip between the reinforcing roll and the work roll and the generation of thrust force are suppressed, but the reinforcing roll directly receiving the rolling load is used. Since the center of the metal chock is shifted from the center of the screw, a rotational moment is applied to the metal chock, and a local load is generated on the mill stand to hinder the smoothness of the rolling operation and increase wear. To prevent this, see, for example,
As described in JP-A-131004, an equalizer beam having a large rigidity is inserted between the driving side and the operation side of the rolling mill so as to be balanced. However, in this method, a beam having a large rigidity is required, and the rolling is inevitably performed. The machine has to be enlarged.

Although the work roll does not receive a thrust from the reinforcing roll, it receives a thrust from a rolled material by cross-rolling and requires a large thrust bearing capable of withstanding the thrust, so that the diameter of the work roll is restricted. In addition, if an attempt is made to employ an axial shift of a work roll, which has been effective in schedule-free rolling of a hot strip mill in recent years, the structure must be enlarged.

[0007] Further, the thrust force of the work rolls in which the rolls do not cross is 1-2% of the rolling load in the case of hot rolling. However, when the rolls cross, the thrust force is 5% of the rolling load and 2-3 times the rolling load. Also reach. Recently, it is planned that the finishing mill of the hot strip mill be continuous, in which case the metal chocks of the reinforcing rolls are moved for the roll cloth during rolling, that is, under a huge rolling load. Is required, and the structure is further complicated because a special bearing is employed.

[0008] The reason why the rolling mill in which only the work rolls cross is not practically used is that the following two problems cannot be solved.

First, when a work roll is crossed with a reinforcing roll, a huge thrust force (thrust) acts in a direction opposite to the axial direction of both rolls. This value changes depending on the cross angle, but reaches around 30% of the rolling load.
Thrust bearings with large-diameter reinforcement rolls are not impossible to withstand, but are difficult for work rolls that are less than one-half the reinforcement roll diameter.

The second problem is roll wear due to relative slip between the reinforcing roll and the work roll. The work rolls are replaced in 2-3 hours due to wear by the rolled material which is much larger than the wear due to this cause, so there is no problem, but the replacement of the reinforcing rolls is performed every 10 to 20 days, and the replacement is also long. Therefore, increasing the frequency of changing rolls due to rapid roll wear greatly reduces productivity.

In the rolling mills described in JP-A-57-118804 and JP-A-57-25206, the shape control ability is enhanced by using roll bending and a variable crown method in combination with a roll cloth as described above. However, the above-mentioned pair cross method and the method of crossing only work rolls have the same problem. That is, there is a problem that the rolling mill becomes large and the structure becomes complicated in the pair cross system, and it is difficult to put the rolling mill to practical use in the system in which only the work rolls are crossed.

In order to solve the above problems, in a four-high rolling mill in which only the work rolls are crossed, the thrust force acting on the work rolls is reduced with a simple configuration, and the ability to control the strip crown of the rolled material is sufficiently improved. For the purpose of being able to demonstrate,
The present applicant filed Japanese Patent Application No. 3-66007 (filing date: Heisei
March 29), a pair of work rolls and a pair of reinforcing rolls respectively supporting the work rolls, and the pair of work rolls are arranged so that their axes are perpendicular to the direction of the rolling pass. The pair of reinforcing rolls are inclined so as to intersect in the opposite direction to each other in the horizontal plane, and the pair of reinforcing rolls are arranged so that their axes are oriented in a direction perpendicular to the rolling pass direction. A rolling mill in which a lubricant supply device for supplying lubricant is arranged was proposed.

According to the invention of the prior application, in a four-high rolling mill in which only work rolls are crossed, by supplying a lubricant between the work rolls and the reinforcing rolls, a thrust force generated in the rolls by the roll cross is suppressed to be small. At the same time, it succeeded in easily changing the crown during rolling while having a high crown control ability.

However, the roll crown control of the rolling mill proposed in the above-mentioned prior invention uses only the geometric inter-roll gap profile created by the crossing of the work rolls. Here, in this method, the strip crown C _R, when the upper and lower roll radius and _{R 1, R 2, C R} = δ 2/2 (R 1 + R 2) = θ 2 x 2/2 (R 1 +
R ₂ ) where θ: cross angle x: distance from the roll center and expressed by a quadratic equation.

By the way, in recent years, the material rolled by the hot finishing rolling equipment is wide and thin, hardened, and the plastic flow of the plate is not three-dimensional at the subsequent stage of the finishing stand and approaches the cold rolling, so that the plate thickness is large. In this case, the role of forming a sheet crown has been playing an important role in maintaining flatness by shape control. In addition, in the rolling of thin hard materials, the work roll diameter D with respect to the maximum sheet width B is D / B ≦ from the viewpoint of rolling load and power.
It is desirable to use a work roll as small as 0.3.
However, when the diameter of the roll is reduced, the flexural rigidity of the roll is reduced, and the flexure of the roll is expressed by a higher order formula of third to fifth order, and a composite shape defect such as a quarter buckle occurs on the plate. In addition, the thermal crown of the roll also gives rise to a profile of the second or higher order. For this reason, if only the roll gap profile control represented by the above quadratic equation is used, the function is insufficient to obtain a plate having a good shape.

A first object of the present invention is to reduce the thrust force acting on a work roll with a simple structure and to cross only a work roll capable of correcting a complex shape defect even when a small-diameter work roll is used. A four-high rolling mill is provided.

A second object of the present invention is to provide a hot finish rolling method and equipment for realizing the rolling of a thin hard material.

A third object of the present invention is to provide a hot finish rolling method and equipment for efficiently rolling a thin hard material and a conventional thick material.

[0019]

In order to achieve the first object, the present invention comprises a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls. The work rolls are respectively inclined such that their axes intersect in a direction opposite to the direction perpendicular to the rolling pass direction in a horizontal plane, and the pair of reinforcing rolls are rotated in a direction in which their axes are perpendicular to the rolling pass direction. In the rolling mill arranged to face each other, a lubricant supply device that supplies a lubricant between the work roll and the reinforcing roll is arranged,
Means for imparting a bending force to the pair of work rolls is provided.

Further, in order to achieve the second object, the present invention provides (a) a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls, and The rolls are respectively inclined so that their axes intersect in the opposite direction in the horizontal plane with respect to the direction perpendicular to the rolling pass direction, and the pair of reinforcing rolls are oriented so that their axes are perpendicular to the rolling pass direction. Means for applying a bending force to the pair of work rolls in a rolling mill in which a lubricant supply device that supplies a lubricant between the work rolls and the reinforcing rolls is provided, and b) A hot finish rolling method is provided in which the rolling mill is disposed at least at the final stand after the finish rolling stand of the hot finish rolling equipment to roll a sheet material. In this case, preferably, as a pair of work rolls of the rolling mill,
The roll diameter D is D / B ≦ the maximum sheet width B of the sheet material.
Roll using a work roll of 0.3.

Further, in order to achieve the third object, the present invention provides the hot finish rolling method, wherein the pair of work rolls of the rolling mill has a roll diameter D that is equal to the maximum plate width B of the plate material. A work roll satisfying D / B ≦ 0.3;
The work roll with /B>0.3 is switched and used according to the thickness of the plate material.

Further, in order to achieve the second object, the present invention provides a hot finishing rolling equipment having a plurality of finishing rolling stands, a pair of work rolls and a pair of work rolls respectively supporting these work rolls. And a pair of work rolls, and each of the pair of work rolls is inclined such that their axes intersect in a direction opposite to the direction perpendicular to the rolling path in a horizontal plane in the opposite direction. A lubricant supply device for supplying a lubricant is arranged between the work roll and the reinforcing roll, and the bending is performed on the pair of work rolls. A rolling mill provided with a means for applying a force is arranged at least at a final stand after the finish rolling stands. In this case, preferably, the roll diameter D of the pair of work rolls of the rolling mill is D / B ≦ 0.3 with respect to the maximum plate width B of the plate.

Further, in order to achieve the third object, the present invention provides the hot finishing mill, wherein a pair of work rolls of the rolling mill has a roll diameter D corresponding to a maximum plate width B of the plate material. On the other hand, it has a work roll with D / B ≦ 0.3 and a work roll with D / B> 0.3 which is switched to use.

[0024] The rolling mill may further include means for shifting the pair of work rolls in the roll axis direction.

[0025]

According to the present invention, a lubricant is supplied between a work roll and a reinforcing roll in a four-high rolling mill in which only work rolls are crossed. The effect of the invention described in the earlier application is obtained. That is, while the thrust force generated in the roll by the roll cloth is suppressed to be small, the crown change during rolling can be easily performed while having high crown control ability, and therefore, only the work roll is crossed.
It becomes possible to realize a step rolling mill.

Further, according to the present invention relating to the first object, it is possible to correct the composite shape defect of the plate by increasing the shape control ability by crossing the work rolls and applying a bending force to the work rolls. Become. That is,
In order to correct a complex shape defect when a thin hard material is rolled using a small-diameter work roll at a stage subsequent to a finishing stand of a hot finishing rolling equipment, the deflection of the roll represented by the quadratic formula or the roll gap profile and the secondary It is necessary to control the gap between the rolls by combining the deflection of the rolls represented by the above high-order expressions. In the present invention, the inter-roll gap profile represented by the quadratic equation is changed by crossing the work rolls, and the bending of the work rolls represented by a higher-order equation is given to the work rolls by applying a bending force to the work rolls. And the combination of these enhances the shape control ability, and can correct the complex shape defect of the plate that occurs when rolling using the small-diameter work roll, and the complex shape defect caused by the thermal crown Becomes

According to the second aspect of the present invention, a rolling mill having excellent shape control capability is arranged at least at the last stand after the stand of the hot finishing rolling equipment for thin hard material which easily generates the complex shape. Thereby, it becomes possible to carry out rolling without changing the shape while keeping the crown ratio constant with respect to the plate crown produced in the preceding stage. That is, in the stage before the finishing stand, the deformation of the plate is strongly tertiary deformation, and the crown of the plate can be changed without changing the shape of the plate by so-called lateral flow. However, as the rolling progresses and the thickness decreases, the lateral flow of the plate disappears, The crown change of the plate replaces the shape change. Therefore, in the subsequent stage, it is necessary to perform rolling so that the plate crown ratio, which is the ratio of the plate crown formed in the preceding stage to the plate thickness, does not change, that is, the shape does not change. By arranging a rolling mill having excellent shape control capability at least at the final stand after the stand of the hot finishing rolling mill for this purpose, a thin hard material can be rolled while maintaining flatness.

On the other hand, in the case of a material having a relatively large thickness, some tertiary deformation elements remain even in the final thickness, and the control of the shape is not so severe as in the case of a wide thin material and a hard material. vice versa,
Rolling using a large-diameter roll is more efficient considering roll wear and the like. In the present invention according to the third object, a small-diameter roll applied to at least the final stand after the finishing stand can be switched to a large-diameter work roll as a roll chock assembly. This makes it possible to switch between large-diameter and small-diameter rolls with a four-high rolling mill, thereby efficiently rolling a thin hard material and a thick material.

Further, by providing means for shifting the pair of work rolls in the roll axis direction, the work rolls can be moved in the axial direction during the rolling operation, and the wear can be dispersed, so that schedule-free rolling is possible. Become. Further, the thermal crown becomes gentle due to the axial movement of the work roll, and it becomes easy to correct a complex shape defect caused by the thermal crown.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS.

In FIG. 1, a cross type 4 according to the present embodiment is shown.
The rolling mill includes upper and lower work rolls 1 and 1 and upper and lower reinforcing rolls 2 and 2 for supporting the work rolls.
A work roll chock 3 is provided at a roll end of each work roll 1 and rotatably supports the work roll 1. Similarly, a reinforcing roll chock 4 is provided at a roll end of each reinforcing roll 2 and rotatably supports the reinforcing roll 2.

The work roll chock 3 and the reinforcing roll chock 4 are separated from each other in the roll axis direction of the rolling mill and are provided on a window surface 5 of a pair of stands 5 installed vertically.
The rolling material 6 is rolled by applying a rolling load to each of these rolls from a pressing down jack (not shown) provided on the upper or lower part of the stand 5.

The roll axes of the upper and lower work rolls 1 and 1 can be inclined with respect to the roll axes of the reinforcing rolls 2 and 2 in a horizontal plane, and cross over each other so that the work rolls 1 and 1 cross each other.
Hydraulic jacks 8 and 9 are provided in the project block 7 of the stand 5 facing both sides of the work roll chock 3 provided at both ends of each work roll 1 so that only the work rolls 1 can cross.

FIG. 2 shows a hydraulic system for driving and operating the hydraulic jacks 8 and 9. The hydraulic jack 8 is supplied with pressurized oil via a switching valve 10.
The displacement of the hydraulic ram is detected by detecting the displacement of the rod 11 attached to the hydraulic ram with the sensor 12, and the detection signal is sent to the work roll cross angle controller 13. The work roll cross angle controller 13 calculates a desired cross angle of the work rolls 1 and 1 based on a signal corresponding to a rolling condition, and further calculates a target moving amount of the hydraulic ram for obtaining the cross angle. The switching valve 10 is adjusted to drive the hydraulic jack 8 so that the detected movement amount matches the target movement amount. The cross angle of the work rolls 1 and 1 is controlled to a desired value by such feedback control.

Pressure oil is supplied to the hydraulic jack 9 via a pressure reducing valve 14 and presses the work roll chock 3 with a necessary pressing force.

In order to enable each work roll 1 to move in the roll axis direction, a hydraulic cylinder 15, which drives the work roll along the roll axis, is provided on a stand 5.
Two work rolls 15 are provided so as to sandwich the work roll chock 3. The rods of the two hydraulic cylinders 15, 15 are connected to a common moving block 16.
The work roll 1 is provided with a detachable engaging portion 17 which engages with a protruding portion 3a formed at the end of the work roll chock 3 to transmit the driving force of the hydraulic cylinders 15, 15 to the work roll chock 3 so that the work roll 1 is moved. Move in the roll axis direction.

Although not shown, the work rolls 1,
Needless to say, the control of the above-mentioned axial movement operation is also controlled by the movement amount control device according to the rolling conditions.

Further, as shown in FIGS. 1 and 2, a lubricant supply nozzle 18 is provided along the roll axis so that lubricant can be supplied between the work rolls 1, 1 and the reinforcing rolls 2, 2. It is arranged. The location of the lubrication supply nozzle 18 need not be limited to the illustrated location, but may be any location as long as the lubricant oil, which is a lubricant, can be supplied between the two rolls.

As shown in FIGS. 2 and 3, cylinders 19, 19 for applying bending force to the work rolls 1, 1 are built in the project block 7 with the hydraulic jacks 8, 9 interposed therebetween. . This cylinder 1
9 and 19 act on the fin portions 3b projecting toward both stands of the work roll chock 3 to create a convex or concave inter-roll gap profile.

The reinforcing roll 2 has a roll grinder 20 for grinding the roll surface close to the roll surface during rolling.
Is installed. Further, a brush roller 21 and a cleaning nozzle 22 for removing the lubricating oil attached to the roll surface of the reinforcing roll 2 are provided.

Next, the operation of the present embodiment configured as described above will be described.

First, in the four-high rolling mill of this embodiment,
A lubricant supply nozzle 18 is provided along the roll axis to supply lubricant between the work rolls 1, 1 and the reinforcing rolls 2, 2. By supplying this lubricant, the coefficient of friction between the work rolls 1 and 1 and the reinforcing rolls 2 and 2 is reduced, and the thrust force generated on the work rolls by the cross of the work rolls alone is reduced while maintaining high crown control ability. Thus, it is possible to easily change the crown during rolling, thereby realizing a four-high rolling mill in which only the work rolls are crossed. For details of the operation, refer to Japanese Patent Application No. 3-66007.

Also, since the upper and lower work rolls 1 and 1 are configured to be shifted in the roll axis direction, the work rolls can be moved in the axial direction during the rolling operation, and the wear can be dispersed. Becomes possible.

Next, the shape control capability of this embodiment will be described. In the four-high rolling mill of this embodiment, only the work rolls 1, 1 are crossed, and a bending force is applied to the work rolls 1, 1. The gap between the rolls formed between the work rolls by applying the bending force is such that the roll diameter D of the work rolls is smaller than the maximum plate width B of the rolled sheet material, that is, the mill gap such that D / B <0.3. If with lotion, deflection of the roll by the working roll bending is powered expression, for example, those represented by y = x ^4, but greatly changes the thickness of the portion near the plate end as illustrated in FIG. 4, the central Does not affect the department much.

On the other hand, the work roll cross as shown in FIG. 5, quadratic crown plate, for example, y = can be varied as expressed by x ^2, the central portion of unlike work roll Ben Day ring plate Affects the crown. However, this alone cannot cope with a change in the thickness of the sheet near the edge of the sheet or the like.

Therefore, by combining the bending of the roll due to the work roll bending and the inter-roll gap profile by the work roll cloth, the inter-roll gap profile as shown in FIG. 6 can be formed. It is possible to correct a composite shape defect of a plate, a quarter elongation which is a composite shape defect caused by a thermal crown, and an end / medium extension coexisting shape.

In this embodiment, as described above, the upper and lower work rolls 1, 1 can be moved in the axial direction during the rolling operation, so that the thermal crown becomes gentle, and it is easy to correct the complex shape defect caused by the thermal crown. There is also an effect.

Next, FIG. 7 shows an embodiment in which the small-diameter work roll and the large-diameter work roll are switched. The left side of FIG. 7 shows a small-diameter work roll, and the right side shows a large-diameter work roll. In the present embodiment, as the upper and lower work rolls, the aforementioned small-diameter work rolls 1, 1 whose roll diameter D is D / B ≦ 0.3 with respect to the maximum plate width B of the rolled material 6, and D / B> 0. 3, a large-diameter work roll 1A,
1A, which are switched and used. Here, the small-diameter work rolls 1 and 1 and the large-diameter work roll 1
When switching between A and 1A, it is desirable to use the same chocks if possible. However, due to the difference in torque applied to the roll and the difference in bending force, work roll chocks are also prepared for small diameter 3, 3 and large diameter 3A, 3A respectively. Then, switch the chocks together as an assembly. Also, although not shown, the mill side of the drive spindle is taken up by using a spline mechanism or the like so as to be able to switch the drive spindle inlet (fitting connection having an oval cross section) corresponding to each diameter. Corresponds to a replacement structure.

Next, FIGS. 8 to 10 show hot finishing rolling equipment to which the four-high rolling mill of the above-described embodiment is applied. FIG. 8 shows an embodiment in which the four-high rolling mill of the present invention is used for the last three stands of the finishing rolling equipment 30. In this embodiment, particularly, the first stand of the last three stands is the same as the one shown in FIG. A rolling mill 31 is arranged, and a four-high rolling mill for switching between a small-diameter work roll and a large-diameter work roll shown in FIG. FIG. 9 shows an embodiment in which the four-high rolling mill according to the present invention is used for the last two stands of the finishing rolling equipment 30A. In this embodiment, both the small-diameter work roll and the large-diameter work roll shown in FIG. A step rolling mill 32 is used. FIG. 10 shows an embodiment in which the four-high rolling mill according to the present invention is used for the last stand of the finishing rolling equipment 30B. In particular, the final one stand is a four-stage switch for switching between the small-diameter work roll and the large-diameter work roll shown in FIG. A rolling mill 32 is used.

In recent years, the material rolled by the hot finishing rolling equipment has become wide and thin and hardened. In the stage before the finishing stand, the deformation of the plate is strongly tertiary, and the plate is not changed by the so-called lateral flow without changing the shape of the plate. The crown can be changed, but as the rolling progresses and the thickness is reduced, the lateral flow of the plate disappears, and the crown change of the plate replaces the shape change. For this reason, the maintenance of flatness by shape control has become an important role from the role of forming the plate crown when the plate thickness is large. In addition, when rolling a thin hard material, the work roll diameter D with respect to the maximum sheet width B is D / B ≦ 0 in terms of rolling load and power.
It is desired to use a small diameter work roll of 3.
However, when such a small-diameter work roll is used, the bending stiffness of the roll is reduced, so that the bending of the roll is tertiary to 5th.
This is expressed by the following equation and a higher-order equation, and causes a composite shape defect such as a quarter buckle on the plate. In addition, the thermal crown of the roll also gives rise to a profile of the second or higher order.

In the hot finishing rolling equipment shown in FIGS. 8 to 10, the four-high rolling mills 31 and 32 having excellent shape control ability of the present invention are arranged in the last two to three stands as described above, so that the former stage is improved. It is possible to roll a wide thin or hard material into a good shape and required crown while maintaining flatness while maintaining the flatness with a constant crown ratio for the plate crown made of Becomes

On the other hand, for a material having a relatively large plate thickness, some tertiary deformation elements remain even at the final plate thickness, and the control of the shape is not so severe as that of a wide thin material or a hard material. vice versa,
Considering the wear of the rolls, it is more efficient to roll using a large-diameter work roll. Therefore, in the hot finishing rolling equipment shown in FIGS. 8 to 10, the four-high rolling mill 32 applied to at least the final stand after the finishing stand can switch the small-diameter roll to the large-diameter work roll as a roll choc assembly. As a result, a thin hard material and a thick material can be efficiently rolled.

[0053]

According to the present invention, the thrust force acting on the work rolls of the four-high rolling mill of the type in which only the work rolls are crossed is reduced with a simple structure, and the small-diameter work rolls are mounted on the four-high rolling mill. Even if it is used, complex shape defects can be corrected.

Further, according to the present invention, a wide thin plate and a hard material can be rolled using a small-diameter work roll to prevent the occurrence of a composite shape defect and to produce a hot strip having a good shape with a predetermined plate crown. it can.

Furthermore, according to the present invention, it is possible to efficiently roll a thin hard material and a thick material having a relatively good shape, which is easily corrected even if a shape defect occurs, by switching the roll diameter.
Production efficiency can be increased.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view of a four-high rolling mill according to an embodiment of the present invention as viewed from a roll axis direction.

FIG. 2 is a partial sectional plan view showing a roll cloth device and a shift device of the four-high rolling mill shown in FIG.

FIG. 3 is a partial cross-sectional front view showing a roll bender section of the four-high rolling mill shown in FIG. 1 as viewed from a roll axis direction.

FIG. 4 is a pattern diagram of a roll gap profile based on bending of a work roll due to work roll bending.

FIG. 5 is a pattern diagram of a roll gap profile by a work roll cloth.

FIG. 6 is a pattern diagram of a roll gap profile when work roll bending and cloth are combined and controlled.

FIG. 7 is a front view of a work roll portion when switching between a large-diameter work roll and a small-diameter work roll, as viewed from the roll axis direction.

8 is a diagram showing an example of application of the four-high rolling mill shown in FIG. 1 to finishing rolling equipment.

9 is a diagram showing another example of application to the finishing rolling equipment of the four-high rolling mill shown in FIG.

10 is a diagram showing still another example of application to the finishing rolling equipment of the four-high rolling mill shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vertical work roll 2 Vertical reinforcement roll 3 Work roll chock 4 Reinforcement roll chock 6 Rolled material 8 Hydraulic jack 15 Hydraulic cylinder 18 Lubricant supply nozzle 19 Work roll bending cylinder

────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B21B 29/00 B21B 29/00 A (56) References JP-A-5-169108 (JP, A) JP-A-5-200417 ( JP, A) JP-A-5-185122 (JP, A) JP-A-11-267711 (JP, A) JP-A-5-50110 (JP, A) JP-A-62-34612 (JP, A) JP JP-A-61-279305 (JP, A) JP-A-60-111702 (JP, A) JP-A-48-95970 (JP, A) JP-A-3-234305 (JP, A) JP-A-57-193211 (JP) JP-A-59-39408 (JP, A) JP-A-46-1353 (JP, A) JP-A-62-41401 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB B21B 13/14 B21B 1/22 B21B 1/26 B21B 27/10 B21B 29/00

Claims (8)

(57) [Claims] 1. A pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls, and said pair of work rolls are arranged in a horizontal plane with respect to a direction whose axis is perpendicular to the direction of the rolling pass. And a pair of reinforcing rolls are arranged so that their axes are oriented in a direction perpendicular to the rolling pass direction, and lubrication is provided between the work roll and the reinforcing roll. A four-high rolling mill, comprising: a rolling mill provided with a lubricant supply device for supplying an agent, wherein a means for imparting a bending force to the pair of work rolls is provided. And (a) a pair of work rolls and a pair of reinforcing rolls respectively supporting the work rolls, and the pair of work rolls are arranged so that their axes are perpendicular to the direction of the rolling pass. The pair of reinforcing rolls are inclined so as to intersect in the opposite direction in the horizontal plane, and the pair of reinforcing rolls are arranged so that their axes are oriented in a direction perpendicular to the rolling pass direction. A rolling mill in which a lubricant supply device for supplying a lubricant is interposed, a means for applying a bending force to the pair of work rolls is provided, and (b) the rolling mill is subjected to finish rolling of a hot finishing rolling facility. A hot finish rolling method comprising: placing a sheet material at least in a final stand at a stage subsequent to the stand; and rolling the plate material. 3. The hot finish rolling method according to claim 2, wherein the pair of work rolls of the rolling mill has a roll diameter D.
Rolling using a work roll that satisfies D / B ≦ 0.3 with respect to the maximum plate width B of the plate material. 4. The hot finish rolling method according to claim 2, wherein the pair of work rolls of the rolling mill have a roll diameter D.
Are used by switching between a work roll with D / B ≦ 0.3 and a work roll with D / B> 0.3 with respect to the maximum plate width B of the plate according to the plate thickness of the plate. Characteristic hot finish rolling method. 5. A hot finishing rolling equipment having a plurality of finishing rolling stands, comprising a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls, wherein said pair of work rolls is provided. , Each of which is inclined so that its axis intersects in the opposite direction in the horizontal plane with respect to the direction perpendicular to the rolling pass direction, and the pair of reinforcing rolls are oriented such that their axes are oriented in the direction perpendicular to the rolling pass direction. A rolling mill having a lubricant supply device for supplying lubricant between the work roll and the reinforcing roll, and a means for applying a bending force to the pair of work rolls, A hot finish rolling equipment, wherein the hot finish rolling equipment is disposed at least in a final stand after the finish rolling stand. 6. The hot finishing rolling equipment according to claim 5, wherein a roll diameter D of a pair of work rolls of the rolling mill is D / B ≦ 0.3 with respect to a maximum sheet width B of the sheet material. A hot finish rolling facility characterized by the following. 7. The hot finishing rolling equipment according to claim 5, wherein a pair of work rolls of the rolling mill has a roll diameter D.
Is a work roll that satisfies D / B ≦ 0.3 with respect to the maximum plate width B of the plate material, and D / B> 0.3 which is used by switching to this work roll
Hot finish rolling equipment, comprising: 8. A hot finishing rolling equipment having a plurality of finishing rolling stands, comprising a pair of work rolls and a pair of reinforcing rolls respectively supporting these work rolls, wherein said pair of work rolls is provided. , Each of which is inclined so that its axis intersects in the opposite direction in the horizontal plane with respect to the direction perpendicular to the rolling pass direction, and the pair of reinforcing rolls are oriented such that their axes are oriented in the direction perpendicular to the rolling pass direction. Means for disposing a lubricant supply device for supplying lubricant between the work roll and the reinforcing roll, and shifting the pair of work rolls in the roll axis direction;
A hot finish rolling facility, wherein a rolling mill provided with a means for imparting a bending force to a pair of work rolls is arranged at least in a final stand after the plurality of finish rolling stands.