WO2002002251A1

WO2002002251A1 - Rolling mill and rolling method

Info

Publication number: WO2002002251A1
Application number: PCT/JP2000/004458
Authority: WO
Inventors: Takashi Norikura
Original assignee: Hitachi, Ltd.
Priority date: 2000-07-05
Filing date: 2000-07-05
Publication date: 2002-01-10

Abstract

A rolling mill, comprising a pair of upper and lower working rollers rolling a band steel, two pairs of upper and lower intermediate rolls supporting the working rolls, and two pairs of upper and lower reinforcement rolls supporting the intermediate rolls, respectively, or a rolling mill, comprising a pair of upper and lower working rolls rolling a band steel and two pairs of upper and lower reinforcement rolls supporting the working rolls, respectively, wherein a roll shoulder having a reducing roll diameter is provided at a roll shell end part symmetric with respect to a lateral centerline of the band steel, or a bearing is provided for each reinforcement roll, whereby a rolling machine and a rolling mill excellent in plate crown control capability can be provided while small diameter working rolls are being used.

Description

Specification

Rolling mill and rolling method

The present invention relates to a rolling mill and a rolling method for rolling a metal strip, and more particularly to a rolling mill and a rolling method suitable for obtaining a strip crown and a strip having an excellent shape. Background art

In a four-high rolling mill, a six-high rolling mill disclosed in FIG. 7 of Japanese Patent Application Laid-Open No. 56-66607, and the like, there are problems in reducing the work roll diameter and improving the crown control ability.

Further, as a 10-stage cluster type rolling mill for reducing the diameter of a work roll, for example, Japanese Patent Publication No. 39-182388 and Japanese Patent Application Laid-Open No. 11-277107 are mentioned.

In the 10-stage cluster type rolling mills and the like described in these publications, sufficient consideration has not been given to roll-supporting mechanisms, rolling loads, and other practical applications. There is also a problem in realizing the actual equipment.

An object of the present invention is to provide a rolling mill and a rolling method that use a small-diameter work roll and have excellent sheet crown control ability. Disclosure of the invention

A rolling mill including a pair of upper and lower work rolls for rolling a steel strip, two pairs of upper and lower intermediate rolls supporting the work rolls, and two upper and lower pairs of reinforcing rolls supporting each of the intermediate rolls, A pair of upper and lower work rolls for rolling the steel strip, A rolling mill provided with two pairs of upper and lower reinforcing rolls for supporting each of the work rolls, wherein the roll shoulders whose roll diameters decrease at the roll body end positions symmetrical with respect to the center of the strip width of the strip are respectively provided. Provision of a bearing or a bearing for each reinforcing roll will reduce the diameter of the work roll and improve the crown control ability. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view of a 10-high rolling mill according to a first embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II of FIG.

FIG. 3 is a sectional view taken along the line m-m in FIG.

FIG. 4 is a sectional view taken along the line II-II of FIG. FIG. 4 is an explanatory view of a bending force. FIG. 5 is a diagram showing functions and effects of the 10-high rolling mill shown in FIG. FIG. 6 is a diagram showing a relationship between a moment and a bending force by the rolling method of the present invention and equivalent bending by a cylinder output.

FIG. 7 is a view showing a difference in deflection of a work roll when a moment and a bending roll are applied to the intermediate roll and the work roll by the rolling method of the present invention.

FIG. 8 is a diagram showing the relationship between the plate shape control and roll deflection by the rolling method of the present invention, and the plate shape.

FIG. 9 is a cross-sectional view of FIG. 1 of another 10-high rolling mill according to the second embodiment of the present invention.

FIG. 10 is a sectional view taken along line XX of FIG.

FIG. 11 is a cross-sectional view of FIG. 1 of another 10-high rolling mill according to the third embodiment of the present invention.

FIG. 12 is a cross-sectional view taken along the line II-III of FIG.

FIG. 13 is a cross-sectional view taken along the line xm—xm in FIG. FIG. 14 is a front view of a six-high rolling mill according to a fourth embodiment of the present invention. FIG. 15 is a sectional view taken along the line XV—XV in FIG.

FIG. 16 is a cross-sectional view taken along the line XVI-XVI of FIG.

FIG. 17 is a diagram illustrating the relationship between the operation method of the hydraulic cylinder and the work roll cloth according to the rolling method of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

In a rolling mill equipped with one pair of work rolls, two pairs of intermediate rolls, and two pairs of reinforcing rolls, one pair of upper and lower work rolls for rolling the steel strip is moved to the right and left by two pairs of upper and lower intermediate rolls. It can be firmly supported from both sides on the left side. Further, with such support, the bending of the work roll due to the drive tangential force from another drive roll can be suppressed as small as possible.

On the other hand, by providing a roll shoulder on each of the two pairs of intermediate rolls and moving in the roll axis direction, a work roll outside the width of the strip having the roll shoulder and the work roll are arranged adjacent to the work roll. The contact surface pressure between the reinforcing rolls can be almost eliminated. Therefore, the bending of the upper and lower work rolls can be set in a state substantially parallel to the center of the width of the strip in a point symmetry. In this state, a force bending function and a moment bending function effectively act on both shaft ends of the upper and lower work rolls and the two pairs of intermediate rolls. Therefore, it is possible to freely change the deflection of the work roll, and even if various shape defects occur in the plate material, it is possible to always roll the plate material into a flat plate shape. Can be obtained. Also, by providing a roll shoulder on a pair of work rolls and moving the work rolls in the roll axis direction, the bending of the upper and lower work rolls is centered on the width of the strip. Can be made parallel to each other by point symmetry. Then, the bending function of the force and the bending function of the moment on both shaft ends of the upper and lower work rolls and the two pairs of intermediate rolls work more effectively.

In a rolling mill consisting of a pair of upper and lower work rolls and two pairs of upper and lower reinforcement rolls, the work rolls are firmly supported from the right and left sides by two pairs of upper and lower reinforcement rolls. The deflection of the work roll with a small diameter due to the driving tangential force can be minimized. In this state, the upper and lower work rolls cross each other on a horizontal plane and the gap between the work rolls by the operation of the combination of a plurality of hydraulic cylinders with the reinforcement roll bearings on the operation side and drive side of the two pairs of reinforcement holes. Thus, effective control of the thickness of the strip and control of the plate crown, that is, control of the plate shape, can be performed.

Further, by moving the work roll having a pair of roll shoulders in the axial direction, more effective sheet crown control, that is, sheet shape control can be performed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)

A first embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the rolling mill of this embodiment is a 10-high rolling mill provided with a pair of upper and lower work rolls, two pairs of upper and lower intermediate rolls, and two pairs of upper and lower reinforcing rolls. is there.

The strip 1 to be rolled is rolled by a pair of upper and lower work rolls 2 and 3. The upper work roll 2 is supported on the upper side by two right and left intermediate rolls 4 and 6, and the intermediate ports 4 and 6 are supported by the reinforcing rolls 8 and 10, respectively.

The reinforcing rolls 8, 10 are individually supported rotatably by bearings and reinforcing roll bearing boxes 18a, 18b, respectively. Roller bearings for each reinforcing roll Since the boxes are provided, it is possible to individually install a rolling load device and a pass line adjusting device. Also, the direction of the rolling load from the rolling load device can be set as appropriate.

These reinforcing roll bearing boxes 18a, b are supported by housings 23a, b via pass line adjusting devices 20a, b such as Ohm jacks. Here, a load cell (not shown) may be built in the pass line adjusting devices 20a and 20b to measure the rolling load.

The upper work roll 2 is rotatably supported by the work roll bearing boxes 27a, b, c, d. Since a work port bearing is provided for each work roll, it becomes possible to easily apply a bending force to the work rolls or to move in the axial direction for each work roll.

The upper intermediate rolls 4, 6 are individually rotatably supported by the intermediate roll bearing boxes 25a, b, c, d. Since an intermediate roll bearing is provided for each intermediate roll, bending force can be easily applied to the intermediate roll, and axial movement of each intermediate roll is enabled.

The lower work roll 3 is in contact with and supported by two intermediate rolls 5 and 7 on the lower side, and the intermediate rolls 5 and 7 are supported in contact with the reinforcing rolls 9 and 11, respectively. The reinforcing rolls 9, 11 are individually supported rotatably by bearings and reinforcing roll bearing boxes 19a, b, respectively. The reinforcing roll bearing boxes 19a, b are supported by housings 23a, b via hydraulic cylinders 21a, b. The hydraulic cylinders 21a and b may be provided only at the right or left two places, and the rest may be a pass line adjusting device such as an ohm jack as in the upper case.

The lower work roll 3 is rotatably supported by a work roll bearing box 28a, b, c, d, and the lower intermediate rolls 5, 7 are individually mounted on intermediate roll shafts. The receiving boxes 30a, b, c, and d are rotatably supported.

Here, in this embodiment, the rolling load is applied by the hydraulic cylinders 2 l a and b which are rolling load devices. The direction of the rolling load applied from the rolling load device is different from the normal vertical direction and is applied from a direction inclined with respect to the vertical direction. For example, as shown in Fig. 1, the direction in which the rolling load is applied from the rolling load device to the reinforcing roll bearing box is the direction from the reinforcing roll 9 to the work roll 3 via the intermediate roll 5, and the horizontal direction. Contains ingredients. This horizontal component can also reduce the deflection of the work roll.

Also, since a reinforcing roll bearing box is provided for each reinforcing roll and a rolling load is applied in the above-described direction, a large rolling load can be applied. That is, for example, a reinforcing roll bearing box that integrally supports the lower two reinforcing rolls is provided, and when a rolling load is applied in the vertical direction, the rolling load direction applied to the reinforcing roll from the rolling load device and the intermediate position from the reinforcing roll The direction of transmission of the rolling load when transmitting to the work roll via the roll is different, and when a large rolling load is to be applied, it is necessary to use a rigid and strong reinforcing roll bearing box, which increases the size. On the other hand, in the present embodiment, a reinforcing roll bearing box for supporting each of the two lower reinforcing rolls is provided, and a rolling load is applied in a direction inclined with respect to the vertical direction. The direction of the rolling load applied to the work roll is almost the same as the direction of the rolling load transmitted from the reinforcing roll to the work roll via the intermediate roll, so even if a large rolling load is to be applied, the size of the reinforcing roll bearing box is small. Is possible.

Also, if the upper and lower reinforcing rolls are integrally supported, or if the upper and lower roll groups are integrally supported, it is difficult to properly follow the change in roll diameter. That is, by rolling, usually The roll diameter changes due to abrasion and polishing to improve the surface properties. An integrated support mechanism for multiple rolls cannot cope with changes in the diameter of each roll. On the other hand, as in the present embodiment, a bearing box is provided for each roll, and a pressing device (pass line adjusting device or rolling load device) is provided for each reinforcing roll bearing box. Can be easily handled by adjusting the individual pressing devices.

If the two upper and lower reinforcing rolls are integrally supported, or if the upper and lower port groups are integrally supported, it is difficult to replace individual rolls. On the other hand, in the present embodiment, since the bearing is supported for each roll, it is easy to replace each roll.

The rolling torque is transmitted from a spindle (not shown) through the work rolls 2 and 3 or the intermediate rollers 4 and 6.

The intermediate rolls 4, 5, 6, 7 have a roll diameter at the roll body end position that is point-symmetric with respect to the center of the width of the strip 1 for the upper and lower pairs forming the left and right sides, or the left and right pairs forming the upper and lower sides. Each has a decreasing roll shoulder. The intermediate rolls 4, 5, 6, 7 are supported by bearing boxes 25a, b, c, d, 30a, b, c, d via bearings not shown. The bearing boxes 25b and 30b are connected to a shift frame 33 via detachable hooks 32a and b, and the shift frame 33 is provided with a housing 23 so as to be movable in the roll axis direction. It is connected to hydraulic cylinders 31a and 31b fixed to b.

The intermediate rolls 4, 5, 6, and 7 have a bearing box with hydraulic cylinders 26a, b, c, d, 29a, b, c, d built into the shift blocks 16a, b. 25 a, b, c, d, 30 a, b, c, d provide moment and / or force bending. Shift blocks 16 a and b are It is supported by housings 23a and b so that it can move in the roll axis direction. The shift blocks 16a, b are connected to the shift frame 33 by hooks 32a, b, similarly to the bearing boxes 25b, 30b.

The working ports 2, 3 are supported by bearing boxes 27a, b, c, d, 28a, b, c, d via bearings not shown. The working ports 2 and 3 are provided with bearing boxes 27 a and b by hydraulic cylinders 24 a, b, c, d and 31 a, b, c, d fixed to the nozzles 23 a, b. , c, d, 28 Bending of moment and Z or force is applied via a, b, c, d.

Next, the concept of the rolling method according to the present embodiment for controlling the plate shape of the material to be rolled using the above-described 10-high rolling mill will be described. The cylinder pushing output of cylinders 24c and 24d shown in Fig. 4 is Fa, the cylinder pushing output of cylinders 24a and 24b is Fb, and the cylinder pulling outputs are Fd and Fc, respectively. When the outputs F a to F d are applied to the work rolls 2, 3, and Z or similarly to the intermediate rolls 4, 5, 6, 7, so as to have the incremental bending force in the direction shown in FIG. However, the strip 1 is rolled to have a medium elongation tendency.

On the other hand, when the outputs Fa to Fd are applied so as to have a decreasing bending force in the direction shown in FIG. 8 (b), the strip 1 is rolled to have an end elongation tendency.

In addition, when the position of the shoulder of each of the intermediate rolls 4, 5, 6, and 7 is moved inward of the strip width of the strip 1, the strip 1 is rolled to have a middle-stretching tendency, and the outside of the strip width of the strip 1 is rolled. When it is moved in the direction, the strip 1 is rolled in a tendency to elongate.

The deflection of the upper work roll 2 due to the bending force imparting function is expressed by the following equation (1), assuming a cantilevered simple supporting beam.

^{v = FL 3 (l - 3} x / 2 L + x 3/2 L 3) / 3 EI - (1) Here, v is the deflection of the upper work roll 2, F is the bending force, E is the modulus of elasticity, I is the second moment of area, and L and X are the dimensions defined in FIG.

On the other hand, the deflection of the upper work roll 2 due to the moment imparting function is expressed by the following equation, assuming that the cantilever is a simple supporting beam.

V = -M (x - L) 2/2 EI - (2) wherein, M represents a moment.

Therefore, when the bending force F and the moment M are simultaneously applied, the sum of the expressions (1) and (2) is the deflection of the upper work roll 2. Here, if the magnitudes of the bending force F and the moment M are appropriately adjusted, the upper work as shown in (a) of FIG. Roll 2 deflection is obtained. At this time, if the cylinders 24 a, b, c, and d shown in FIG. 4 are used selectively as shown in the following formula using the push and pull outputs F a to F d, As shown in (b), a roll deflection equivalent to the mouth deflection shown in (a) of FIG. 6 is obtained.

F = Fd−Fb · ′ · (3) Μ = <5 · Fb (4) Here, δ indicates a dimension between the cylinder 24a and the cylinder 24b. Working force of cylinders 24 a, b, c, d pushing and pulling F a to F d is equivalent to bending force F and moment M in the direction shown in Fig. 8 (c) in working ports 2 and 3. Then, the plate shape of the strip 1 is rolled into an M-shaped elongated shape.

On the other hand, the output F a to F d of the pushing and pulling of the cylinders 24 a, b, c and d becomes equivalent to the bending force F and the moment M in the directions shown in Fig. 8 (d) on the work rolls 2 and 3. The shape of the strip 1 is Rolled into a knuckle shape.

If the work rolls 2 and 3 have smaller diameters than the intermediate rolls 4 and 5, a bending force F and a moment M are applied to the upper intermediate rolls 4 and 6 shown in Fig. 7 (a). In comparison with the distance L1 between the peaks of the deflection of the upper work roll 2 due to the upper work roll 2, the upper work roll 2 by applying the bending force F and the moment M to the upper work roll 2 shown in FIG. 7 (b). The distance L 2 between the peaks of the deflection 2 becomes large.

In the rolling method of the present embodiment based on the above concept, the cylinders 24, 28a, b, c, d and the cylinders 26, 29a, b, c, d are driven and the intermediate roll 4 is driven. Roll movement is performed so that the position of the roll shoulders of, 5, 6 and 7 coincides with the vicinity of the width end of the strip 1. In this state, the work rolls 2 and 3 are almost parallel to the center of the strip in point symmetry, so that the almost flat strip 1 is rolled. Moment M and bending force F are applied to both ends of work rolls 2 and 3 and intermediate rolls 4, 5, 6, and 7 in opposite directions by one roll.

According to the rolling method of this embodiment, as shown in FIG. 5 (b), the strip is formed by the linear pressure distribution S2 between the intermediate ports 4, 5, 6, 7 and the work rolls 2, 3. There is almost no contact pressure between the work rolls 2 and 3 and the intermediate rolls 4 and 5 outside the width of the plate on one side, and the deflection T u 2 of the work roll 2 and the deflection T d 2 of the lower work roll 3 are one point. As shown by the dashed line, it is almost parallel to the center of the strip 1 with point symmetry.

On the other hand, as a comparative example, as shown in Fig. 5 (c), the conventional four-high rolling mill uses the strip pressure due to the linear pressure distribution S3 between the work rolls 42 and 43 and the reinforcing ports 44 and 45. The contact surface pressure between the work holes 42 and 43 and the reinforcing rolls 44 and 45 is generated outside the width of the plate 1 and the deflection Til 3 of the work roll 42 and the lower work hole The deflection T d 3 of the screw 43 becomes as shown by the dashed line, and the thickness of the end portion of the strip 1 sharply decreases.

As described above, in the present embodiment, the positions of the roll shoulders of the intermediate rolls 4, 5, 6, and 7 are made to coincide with the vicinity of the width end of the strip 1, respectively. The contact pressure between the rolls 2 and 3 and the intermediate rolls 4, 5, 6 and 7 is almost non-existent on one side, and the deflection of the work rolls 2 and 3 is almost parallel to the center of the strip 1 in point symmetry. As a result, the moment M and the bending force F effectively act on the work rolls 2 and 3, so that the deflection of the work rolls 2 and 3 can be changed freely. When using strips 2 and 3, even if various strip shape defects occur in strip 1 due to the base material crown and thermal crown due to roll thermal expansion, strip strip 1 is stretched in the middle, edge is stretched, and composite strip is stretched. The plate shape can be controlled freely, and it is possible to always correct and roll to the desired plate shape. As described above, it is possible to obtain the strip 1 having an excellent plate shape.

In addition, since the moment M and the bending force F are provided to the intermediate rolls 4, 5, 6, and 7 in addition to the work rolls 2 and 3, a wide plate shape can be controlled.

In the rolling mill according to the present embodiment, the work roll can be made smaller in diameter, and the crown control ability can be improved. Therefore, a remarkable effect can be expected particularly in the rolling of a hard material. Further, by arranging the rolling mill of the present embodiment in front of the tandem rolling mill, a remarkable effect can be expected.

(Second embodiment)

Next, FIGS. 9 and 10 show a second embodiment of the present invention. In the figure, the same members as those shown in FIG. 1 are denoted by the same reference numerals, and the description of the members having the same configuration and operation as the first embodiment will be omitted. Second implementation The example is also a 10-high rolling mill, and the strip 1 is rolled by a pair of upper and lower work rolls 46 and 47. The work ports 46, 47 have roll shoulders whose roll diameters decrease at the roll body end positions symmetrical with respect to the center of the width of the strip 1 in the upper and lower pairs.

The working ports 46, 47 are supported by bearing boxes 27a, b, c, d, 28a, b, c, d via bearings not shown in the same manner as in the first embodiment. ing. The bearing boxes 27a and 28a are connected to a shift frame 49a via a hydraulic cylinder 48a, and the shift frame 49a is fixed to the housing 23a. The bearing boxes 27b and 28b are connected to a shift frame 49b via a hydraulic cylinder 48b, and the shift frame 49b is fixed to the housing 23b. The work rolls 46, 47 are shifted in the roll axis direction by the push / pull operation of the hydraulic cylinders 48a, 48b.

Other configurations are the same as in the first embodiment. In the case of the present embodiment, when the positions of the roll shoulders of the work rolls 46 and 47 are made to coincide with the vicinity of the width end of the strip 1, respectively, the intermediate rolls 4, 6 and 5 are formed as shown in FIG. The linear pressure distribution S1 between the work ports 46, 47 and the work rolls 46, 47 and the contact pressure between the work rolls 46, 47 outside the width of the strip 1 and the intermediate rolls 4, 6, 5, 7 are: There is almost no deflection on both sides, and the deflection Tu l of the upper work roll 46 and the deflection T d 1 of the lower work I roll 47 are almost parallel and symmetric as shown by the dashed line. As a result, the moment M and the bending force F more effectively act on the work rolls 46, 47, so that the deflection of the work rolls 46, 47 can be freely changed, and the strip 1 is extended in the middle, It is possible to freely control the elongation and the composite elongation into a plate shape, and it is possible to obtain a strip 1 having an excellent plate shape.

(Third embodiment) Next, a third embodiment of the present invention is shown in FIG. 11, FIG. 12, and FIG. In the figure, members that are the same as the members shown in FIGS. 1 and 2 are given the same reference numerals, and descriptions of those having the same configurations and operations as those of the first embodiment are omitted.

The third embodiment is also a 10-high rolling mill, and the strip 1 is rolled by a pair of upper and lower work rolls 50 and 51. The work rolls 50 and 51 each have a pair of upper and lower roll shoulders whose diameter is reduced at the mouth end portion of the mouth which is point-symmetric with respect to the center of the width of the strip 1. are doing.

The work rolls 50 and 51 are provided with thrust bearings at the end of the mouth.

It is connected to cylinders 55a, b, 56a, b via 54a, b, 57a, b and pins 68a, b. The hydraulic cylinders 55a, b, 56a, b are fixed to the housings 23a, b via shift frames 66a, b. The work rolls 50 and 51 are shifted in the roll axis direction by the pushing and pulling operations of the hydraulic cylinders 55 a and b and 56 a and b. Bearings 64a, b, c, d are rotatably contacted near the roll end of the upper working roll 50, and the bearings 64a, b, c, d are pins.

It is connected to hydraulic cylinders 67 a, b, c, d via 61 a, b, c, d. On the other hand, bearings 63, 65a, b, c, and d are rotatably contacted near the roll end of the lower work roll 47, and the bearings 63, 65a, b, c, and d are in contact with each other. , And are connected to hydraulic cylinders 67 a, b, c, d via pins 60, 62 a, b, c, d. By extruding these hydraulic cylinders 67 a, b, c, d, the upper and lower work rolls

A positive bending force can be given to 50 and 51 in the vertical direction.

Also, near the end of the upper work roll 50, bearings 53a, b Are in rotatable contact, and their bearings 53a, b are connected to hydraulic cylinders 52a, b via pins 69a, b. Bearings 58a, b are rotatably contacted near the roll end of the lower working hole 51, and the bearings 58a, b are connected to the hydraulic system via pins 70a, b. It is connected to Linda 59 a, b. By extruding these hydraulic cylinders 52, 59a, b, a negative bending force can be imparted to the upper and lower work rolls 50, 51 in the vertical direction. Further, by extruding both the hydraulic cylinders 67a, b, c, d and the hydraulic cylinders 52, 59a, b, bending of force and moment can be imparted. Other configurations are the same as those of the second embodiment.

In the case of this embodiment, since the work rolls 50 and 51 do not have bearings, the handling of the portal becomes very easy, and the operability is improved.

(Fourth embodiment)

Next, a fourth embodiment of the present invention is shown in FIG. 14, FIG. 15, and FIG. In the figure, the same members as those shown in FIG. 1 are denoted by the same reference numerals, and the description of the members having the same configuration and operation as the first embodiment will be omitted. The fourth embodiment is a six-high rolling mill, and the strip 1 is rolled by a pair of upper and lower work rolls 2 and 3. The strip 1 to be rolled is rolled by a pair of upper and lower work rolls 2 and 3. The upper work roll 2 is supported on the upper side by contact with two left and right reinforcing ports 8, 10. The reinforcing rolls 8, 10 are provided with bearings and reinforcing roll bearing boxes 18 a, b (not shown). , c, and d are individually supported rotatably. The reinforcing roll bearing boxes 18a, b, c, d are supported by housings 22a, b via hydraulic cylinders 33a, b, c, d. Here, even if a load cell (not shown) is installed at the tip of the rod of this hydraulic cylinder 33a, b, c, d, the rolling load can be measured. good.

The lower work roll 3 is supported on the lower side in contact with two left and right reinforcing rolls 9 and 11, and the reinforcing rolls 9 and 11 are used for bearing and reinforcing roll bearing boxes 19 (not shown). The bearing housing 19 a, b, c, d is rotatably supported by a, b, c, d. The housing 19 a, b, c, d is provided via a hydraulic cylinder 21 a, b, c, d. 23 Supported by a and b. The hydraulic cylinders 33, 21a, b, c, and d may be provided only at the right or left two locations, and the rest may be a pass line adjusting device such as an ohm jack.

Here, the rolling load is applied by the hydraulic cylinders 33, 21a, b, and the rolling torque is transmitted from the spindle (not shown) by the work rolls 2, 3 or the intermediate rolls 4, 6.

Further, as in the first embodiment, the rolling load direction applied from the rolling load device is different from the vertical direction and is inclined with respect to the vertical direction, so that the above-described effects can be obtained. '

The work rolls 2 and 3 have roll shoulders whose roll diameters are reduced at the roll body end positions that are point-symmetric with respect to the center of the width of the strip 1 in the upper and lower pairs forming the left and right sides. Alternatively, a work roll without a roll shoulder may be used to carry out a cyclic shift in the axial direction. The work rolls 2 and 3 are supported by bearing boxes 36 and 37 a, b, c and d via bearings (not shown). This figure shows an example in which one roll has two bearings on one side, but two bearings on one side may be used. The bearing boxes 36, 37b are connected to the shift frame 72 through detachable hooks 73a, b, and the shift frame 72 is housed so that it can move in the roll axis direction. Hydraulic cylinder 7 1 fixed to b is connected to a and b. The work rolls 2 and 3 are provided with the hydraulic series built in the shift blocks 38 a and b. 40a, b, c, d, 41a, b, c, d, through the bearing boxes 36a, b, c, d, 37a, b, c, d A power banding is granted. The shift blocks 38a, b are supported by the housing 22b so as to be movable in the roll axis direction. The shift blocks 38a, b are connected to the shift frame 72 by hooks 73a, b, similarly to the bearing boxes 36b, 37b.

Next, the concept of the rolling method of the present embodiment in which the rolling mill is used to control the thickness of the material to be rolled and the crown control (plate shape control) will be described with reference to FIG. First, a method for controlling the thickness will be described. First, the upper hydraulic cylinders 33a, b, c, and d are controlled so that all upper hydraulic cylinders 33a, b, c, and d are at the same position in order to determine the vertical position of the upper work roll 2. The thickness is measured with an inlet thickness gauge and an exit thickness gauge (not shown), and the lower right operating side hydraulic cylinder 21a or Z and the lower left operating side hydraulic cylinder 21c and lower right driving are used. Side hydraulic cylinder 2 1b or Z and lower left drive side hydraulic cylinder 2 1 d are opened and closed while taking the operating side and drive side repelling, apply pressure to the lower work roll, and control the thickness to the target thickness. .

Next, a method for performing sheet crown control (sheet shape control) will be described. First, pull the upper right operating side hydraulic cylinder 3 3 a from the initial position, press the upper right driving side hydraulic cylinder — 3 3 b from the initial position, and simultaneously press the upper left operating side hydraulic cylinder 1 3 3 c from the initial position. By pulling the left drive side hydraulic cylinder 33d from the initial position, the upper reinforcing rolls 8, 10 tilt according to the movement of the hydraulic cylinder 33, respectively, and the work roll 2 tilts in the horizontal direction in the plate width direction. . Also, press the lower right operating side hydraulic cylinder 21a from the initial position, pull the lower right operating side hydraulic cylinder 21 from the initial position, and simultaneously pull the lower left operating side hydraulic cylinder 21c from the initial position. Lower left drive side hydraulic cylinder 2 1d first By pressing from the initial position, the lower reinforcing rolls 9 and 11 tilt according to the movement of the hydraulic cylinder 21 respectively, and the lower work roll 3 moves in the horizontal plane in the direction opposite to the upper work roll 2 with respect to the plate width direction. Lean. That is, the upper and lower work rolls 2 and 3 cross each other. Due to the roll cloth of the work roll, the gap between the work rolls is geometrically larger at the end of the work width than at the center of the work width, resulting in a concave crown (medium extension shape). Therefore, the crown (plate shape) is detected by a crown meter (shape detector), not shown, and the hydraulic cylinders 121, 33 are operated accordingly to control the crown (plate shape control). Becomes possible.

According to this embodiment, the thrust can be received by the roll cloth at the upper and lower two reinforcing openings 8, 10, 9, and 11, respectively, so that a large roll cloth can be added. Therefore, the crown control (plate shape control) capability of Honguchi One Cross becomes large. By adding a force or / and moment bending function, more complex shape defects can be corrected.

In addition, when the thickness control and the crown control (plate shape control) are performed simultaneously, interference between the two is achieved by controlling the thickness control at a control cycle that is sufficiently short of the control period of the crown control (plate shape control). It is rolled into a product with excellent sheet thickness accuracy and sheet crown accuracy (sheet shape accuracy).

In the present embodiment, since the sheet crown control ability is large, the sheet with a relatively thick sheet thickness is arranged on the front stage of a cold tandem mill where there is a great need to change the sheet crown. It becomes possible. A similar roll cloth method may be applied to the first to third embodiments.

As described above, according to the present invention, it is possible to always perform rolling to a flat plate crown and plate shape, thereby obtaining a strip with excellent plate crown and plate shape. Industrial applicability

In the field of rolling, it is possible to provide a rolling mill and a rolling method having excellent sheet crown control ability while using small-diameter work rolls.

Claims

The scope of the claims

1. A pair of upper and lower work rolls for rolling the strip, two pairs of upper and lower intermediate rolls supporting the work rolls, two pairs of upper and lower reinforcing rolls supporting each of the intermediate rolls, A moving device for moving the intermediate rolls in the roll axis direction is provided. A first shoulder is provided at the end of the torso that is symmetrical to the point at the end of the torso to reduce the roll diameter, and at least one of force and moment is applied to both ends of the pair of upper and lower work rolls. And a second bending device for applying at least one of a force and a moment to both ends of the two pairs of intermediate rolls.

2. A pair of upper and lower work rolls for rolling the steel strip, two pairs of upper and lower intermediate rolls supporting the work rolls, and two pairs of upper and lower reinforcing rolls supporting each of the intermediate ports; A moving device for moving each pair of work rolls in the roll axis direction is provided, and a pair of upper and lower work rolls is provided with a roll diameter at a roll body end position which is point-symmetric with respect to the center of the strip width. A first bending device for providing at least one of a force and a moment to both ends of the pair of upper and lower work rolls; and a force and a moment for both ends of the two pairs of intermediate rolls. A rolling mill provided with a second bending device for imparting at least one of them.

3. In the rolling mill according to claim 1 or claim 2,

The upper and lower two pairs of reinforcing rolls each have a reinforcing port bearing rotatably supporting the reinforcing roll on each of the rolls and on the operation side and the driving side, and at least one of the two pairs of upper and lower reinforcing rolls. It is characterized in that a reduction device that applies a reduction force is provided on the reinforcement roll bearings on the operation side and drive side of one reinforcement roll. Rolling mill.

4. The rolling mill according to any one of claims 1 to 3,

A control device for controlling a thickness or a crown of the steel strip is provided, wherein the control device includes: a means for reducing the parallelism of the pair of work rolls; a roll cloth means for crossing the pair of work openings; A rolling mill, wherein at least one of the pair of work roll leveling reduction means is provided.

5. A pair of upper and lower work rolls for rolling the strip, two pairs of upper and lower intermediate rolls that support the work rolls, two pairs of upper and lower reinforcing rolls that support each of the intermediate rolls, The left and right intermediate rolls forming a pair on the left and right or the upper and lower pairs forming the middle roll, or a pair of upper and lower work rolls forming a pair are point-symmetric with respect to the center of the strip width. A rolling mill characterized in that a roll shoulder with a reduced roll diameter is provided at each end of the roll body.

6. An upper work roll and a lower work roll for rolling the steel strip;

First and second upper intermediate rolls supporting the upper work roll,

First and second lower intermediate rolls supporting the lower work roll,

A first upper reinforcing roll supporting the first upper intermediate opening,

A second upper reinforcing roll supporting the second upper intermediate roll,

A first lower reinforcing roll supporting the first lower intermediate roll,

A second lower reinforcing roll for supporting the second lower intermediate roll, wherein the first and second upper reinforcing rolls and the first and second lower reinforcing rolls are rotatably supported, respectively. A rolling mill characterized by providing roll bearings individually.

7. An upper work roll and a lower work roll for rolling a steel strip;

First and second upper intermediate rolls supporting the upper work roll, First and second lower intermediate rolls supporting the lower work roll, and a first upper reinforcing roll supporting the first upper intermediate roll,

A second upper reinforcing roll supporting the second upper intermediate roll,

A first lower reinforcing port for supporting the first lower intermediate roll,

A second lower reinforcing port for supporting the second lower intermediate port, wherein the first and second upper reinforcing rolls and the first and second lower reinforcing rolls are rotatable, respectively. Reinforced roll bearings are separately provided on the operation side and the drive side, and a reduction device is provided on at least one of the reinforcement roll bearings on the operation side and the drive side of the reinforcement roll. A rolling machine for applying a rolling force in a tilted direction.

8. In the rolling mill according to claim 6 or claim 7,

A rolling mill, wherein two reinforcing port bearings are provided for each of the operating side and the driving side for one reinforcing roll.

9. In a rolling mill provided with a pair of upper and lower work rolls for rolling a steel strip and two pairs of upper and lower reinforcing rolls for supporting the work rolls,

A rolling mill, wherein a pair of upper and lower work rolls is provided with a shoulder for reducing a roll diameter at a point of a symmetrical roll body end with respect to a center of a width of the strip plate. .

10. In a rolling mill provided with a pair of upper and lower work rolls for rolling a steel strip and two pairs of upper and lower reinforcing rolls for supporting the work rolls,

A moving device for moving the pair of upper and lower work rolls in the axial direction of the mouth, and a bending device for applying at least one of a force and a moment to both ends of the pair of upper and lower work rolls,

A pair of upper and lower work rolls shall be provided with roll shoulders whose roll diameter decreases at the point of the roll body end point symmetrical with respect to the center of the strip width. A rolling mill.

11. The rolling mill according to claim 9 or claim 10,

A rolling mill, wherein a reinforcing roll bearing rotatably supporting the upper and lower two pairs of reinforcing rolls is provided separately for each reinforcing roll.

1 2. In the rolling mill according to claim 9 or claim 10,

A control device for controlling a thickness or a crown of the strip of steel is provided, wherein the control device includes: a means for parallel lowering the pair of work rolls; a roll cross means for crossing the pair of work rolls; and A rolling mill provided with at least one of a pair of work roll leveling reduction means.

1 3. In a rolling mill equipped with a pair of upper and lower work rolls for rolling a steel strip and two pairs of upper and lower reinforcing rolls for supporting the work rolls,

1 4. In a rolling mill equipped with a pair of upper and lower working ports for rolling a steel strip, and two pairs of upper and lower reinforcing rolls supporting this work roll,

A reinforcing roll bearing for rotatably supporting the two pairs of upper and lower reinforcing rolls is separately provided for each reinforcing roll, and a rolling-down device is provided for at least one reinforcing roll bearing on an operation side and a driving side of the reinforcing roll. Is a rolling mill for applying a rolling force in a direction inclined with respect to a vertical direction.

15. In the rolling mill according to claim 13 or claim 14,

A rolling mill, wherein two reinforcing roll bearings are provided for each of the operating side and the driving side for one reinforcing roll. .

1 6. An upper work roll and a lower work roll for rolling a steel strip;

First and second upper intermediate rolls supporting the upper work roll, First and second lower intermediate rolls supporting the lower work roll,

A first upper reinforcing roll supporting the first upper intermediate roll,

A second upper reinforcing roll supporting the second upper intermediate roll,

A first lower reinforcing roll supporting the first lower intermediate roll,

A second lower reinforcing roll supporting the second lower intermediate roll, comprising:

The first and second upper reinforcing rolls and the first and second lower reinforcing rolls are each provided with a reinforcing roll bearing that rotatably supports each,

A rolling method, wherein a rolling force is applied to at least one reinforcing roll and rolling is performed.

1 7. An upper work roll and a lower work roll for rolling a steel strip;

First and second upper intermediate rolls supporting the upper work roll,

First and second lower intermediate rolls supporting the lower working port,

A first upper reinforcing roll supporting the first upper intermediate roll,

A second upper reinforcing roll supporting the second upper intermediate roll,

A first lower reinforcing roll supporting the first lower intermediate roll,

Reinforcing roll bearings for rotatably supporting the first and second upper reinforcing rolls and the first and second lower reinforcing rolls are individually provided on an operation side and a driving side, respectively;

A rolling method, wherein a rolling force is applied to at least one reinforcing port, and rolling is performed such that a direction in which the rolling force is applied to the reinforcing roll is inclined with respect to a vertical direction.

1 8. A pair of upper and lower work rolls for rolling steel strip, and this work roll is supported In the rolling method of a rolling mill provided with two pairs of upper and lower reinforcing rolls, a reinforcing roll bearing rotatably supporting the two upper and lower pairs of reinforcing rolls is provided separately for each reinforcing roll, and at least one reinforcing roll is provided. A rolling method characterized in that rolling is performed by applying a rolling force.

1 9. In a rolling method of a rolling mill provided with a pair of upper and lower work rolls for rolling a steel strip and two pairs of upper and lower reinforcement rolls for supporting the work rolls, the upper and lower two pairs of reinforcement ports are rotated. Reinforcement roll bearings that are supported as possible are provided separately for each of the reinforcement rolls, a rolling force is applied to at least one of the reinforcement rolls, a reduction force is applied to at least one of the reinforcement rolls, and a reduction to the reinforcement roll is performed. A rolling method, characterized in that rolling is performed with a direction in which a force is applied being inclined with respect to a vertical direction.

20. A pair of upper and lower work rolls for rolling the steel strip, two pairs of upper and lower intermediate rolls supporting the work rolls, and two pairs of upper and lower reinforcement rolls supporting each of the intermediate rolls. A tandem rolling mill, wherein the rolling mill is arranged in a preceding stage.

2 1. A tandem rolling mill characterized in that a rolling mill provided with a pair of upper and lower work rolls for rolling a steel strip and two pairs of upper and lower reinforcing rolls respectively supporting the work rolls is arranged at the front stage. .