JP2698195B2 - Plate rolling mill - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill for rolling steel plates and other metal plates, and more particularly to a rolling mill having a plate shape control function.

[Prior Art] One of the qualities of a steel plate and other metal rolling mills used for vehicles, home appliances, and the like is a plate shape, a plate crown, and an edge drop.

Recently, the demands of users for plate shapes and the like have become more severe, and therefore, various rolling methods or rolling mills capable of controlling the plate shape, plate crown or edge drop have been developed. For example, a six-high rolling mill equipped with an intermediate roll shift mechanism and a work roll bender, a rolling mill in which upper and lower work rolls are crossed, and a six- or twelve-high cluster rolling mill in which a backup roll is divided into a plurality along the roll axis direction And rolling mills that give offset and horizontal deflection to small-diameter work rolls (see "Japan Plastic Working II", Japan Plastic Working Association, August 14, 1986). Further, the rolling mill disclosed in Japanese Patent Application Laid-Open No. 60-238005 supports a work roll by bearings with an inner axle box and an outer axle box, respectively, and performs horizontal bending on the outer axle box with the inner axle box as a fulcrum. It has an additional bending device.

Each of these rolling mills attempts to elastically deform a work roll into a required shape by a roll bending force or a roll shift to obtain a desired plate shape, plate crown or edge drop.

[Problems to be Solved by the Invention] Since the plate shape changes depending on the roll offset amount, the plate shape can be controlled with higher accuracy by controlling the roll offset amount in addition to the horizontal or vertical bending force. There is expected. However, in a conventional rolling mill for offsetting rolls, the roll offset amount is kept constant for each rolling schedule. That is,
During rolling, the roll offset amount could not be continuously changed following the fluctuation of the rolling conditions.

In addition, a force of about several tens tons acts on a sliding surface between the bearing housing and the housing post and a sliding surface between the horizontal roll bender presser and the housing post. For this reason, when a roll offset adjusting device is provided, if the lubrication of these sliding surfaces is insufficient, seizure occurs on the sliding surfaces of the roll offset amount adjusting device and the horizontal roll bender, etc. Not only does the controllability of the shape control deteriorate, but it also causes trouble when changing rolls.

Accordingly, an object of the present invention is to provide a plate rolling mill which is excellent in plate shape controllability and can prevent the occurrence of seizure on a sliding surface of a roll offset adjusting device or the like.

[Means for Solving the Problems] A plate rolling mill according to the present invention is a plate rolling mill provided with a horizontal roll bender for applying a horizontal bending force to a horizontally offset roll, wherein a housing post and a bearing box of the rolling mill are provided. And a roll offset adjusting device comprising a drive device for moving the wedge slidably inserted between the housing post and the wedge between the housing post and the bearing housing.

The horizontal roll bender and the roll offset adjusting device should be at least one of the work roll and the intermediate roll.
Provided on a book roll. The wedges are arranged on the work side and the drive side on the entry side and the exit side of the rolling mill, that is, at four locations. As a drive device for entering and leaving each wedge, a hydraulic cylinder connected to the wedge, a device combining a screw feed mechanism and a motor, and the like are used.

In the above plate rolling mill, a lubricant such as lubricating oil or grease is continuously applied to a sliding surface between a holding portion of a horizontal roll bender and a housing post and a sliding surface between a wedge of a roll offset adjusting device and a housing post and a bearing box. Or an intermittent supply device may be provided.

The lubrication method may be either oil lubrication or grease lubrication, but forced lubrication, in which grease is supplied to the sliding surface by a screw pump, a gear pump, or the like, is appropriate. It is preferable that the roll provided with the horizontal roll bender and the roll offset adjusting device supports the roll shaft with a self-aligning bearing so that the roll shaft can be freely deformed when a bending force is applied. .

[Operation] By moving the wedge between the housing post and the bearing box, the bearing box supporting the roll moves back and forth along the direction of the pass line. That is, the roll offset amount changes. By adjusting the roll offset amount in addition to the horizontal bending force of the roll according to the change in the plate shape or the plate crown during rolling, the work roll shape can be changed in a wide range and with high accuracy.

Also, by supplying lubricating oil or grease to the sliding surface between the bearing housing and the housing post and between the horizontal roll bender retainer and the housing post, the frictional resistance is reduced and the sliding surface is seized. Occurrence is prevented.

FIG. 1 and FIG. 2 show an embodiment of the present invention. FIG. 1 is a plan view of a quadruple rolling mill and FIG. 2 is a side view thereof.

The upper and lower work rolls 3 are supported by a bearing housing 11 at a roll shaft 5. The bearing housing 11 has a convex spherical inner ring 12.
And a self-aligning bearing comprising a concave spherical seat 13. A hydraulic cylinder 16 of a horizontal roll bender 15 is connected to the work roll 3 near the shaft end of the roll shaft 5. A wedge 19 of a roll offset adjusting device 18 is slidably inserted between the post 2 of the housing 1 and the bearing box 11. A hydraulic cylinder 20 is connected to an end of the wedge 19. The hydraulic cylinders 20 work together so that when one wedge 19 moves forward, the other wedge 19 moves backward by the same distance. Hydraulic cylinder above
The operation of each of 16, 16 is controlled by a controller (not shown). The work roll 3 is supported by a backup roll 9.

The lubrication device 31 includes a lubrication tank 23, a lubrication pump 33, and a grease supply pipe. The lubrication pump 33 supplies grease from the lubrication tank 32 to the sliding surface between the holding portion 17 of the horizontal roll bender 15 and the housing post 2 and both surfaces of the wedge 19 and the housing post 2 and the bearing box 11 through the grease supply pipe 34. Feed to sliding surface.

In the quadruple rolling mill configured as described above, the relationship between the magnitude of the horizontal bending force and the roll offset amount of the work roll 3 and the plate shape, the plate crown, and the edge drop amount are experimentally obtained in advance on an actual machine. And stored as a calculation table in a rolling control computer (not shown). When the sheet dimensions, rolling amount and other rolling conditions, and the target sheet shape, sheet crank and edge drop amount are input to the rolling control computer,
The magnitude of the horizontal bending force of the work roll 3 and the roll offset amount are set in the rolling mill. The horizontal roll bending force is applied to the work roll 3 so as to be convexly curved toward the rolling mill exit side, and is offset to the rolling mill exit side. During rolling, the strip shape, strip crown and edge drop amount of the strip rolled on the exit side of the rolling mill are measured.
Based on the measurement result, the rolling control computer outputs a correction signal for the magnitude of the horizontal bending force and the offset amount to a controller (not shown) such as the horizontal roll bender 15, and the sheet shape, the sheet crown and the edge drop amount are fed back. Controlled.

FIGS. 3 and 4 show another embodiment of the present invention. FIG. 3 is a plan view of a six-roll mill and FIG. 4 is a side view thereof. Devices and members similar to those shown in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

The hydraulic cylinder 26 of the vertical roll bender 25 is connected to the work roll 3. Vertical roll bender 25
A vertical bending force is applied to the work roll 3.
The intermediate roll 7 is supported by a self-aligning bearing housing 11.
A hydraulic cylinder 16 of a horizontal roll bender 15 is connected to a portion of the intermediate roll 7 near the shaft end of the roll shaft portion 8. A wedge 19 is slidably inserted between the housing post 2 and the bearing box 11 of the intermediate roll 7, and
The end of 19 is connected to a hydraulic cylinder 20 of a roll offset adjusting device 18. The intermediate roll 7 is supported by a backup roll 9. The lubrication device 31 includes a lubrication tank 32, a lubrication pump 33, and a grease supply pipe 34, and has the same configuration as that of the first embodiment.

The operation of the six-high rolling mill configured as described above is the same as that of the first embodiment except that the magnitude of the vertical bending force applied to the work roll 3 is adjusted.

Here, the steel plate was rolled by the above-mentioned six-fold rolling mill. A specific example will be described.

Rolling machine configuration Work roll: Roll diameter 550mm, Roll trunk length 1820mm Intermediate roll: Roll diameter 400mm, Roll trunk length 1820mm Roll offset amount 0-14mm, Horizontal bending force ± 40TON Roll crown 0.16mm parabolic crown Backup roll: Roll diameter 1420mm , Roll length 1820mm Rolled sheet Material: ordinary steel Sheet thickness: 2.7mm 0.6mm Sheet width: 1500mm Rolling conditions Rolling rate: 30% Rolling speed: 1500m / min The horizontal bending force and roll offset amount were controlled by the above rolling mill. As a result, the plate shape could be changed by about 4% in the middle elongation and edge elongation change Δλ (change in steepness), and a good plate shape could be obtained.

In the case where the sliding surface was not lubricated (applied only when the roll was changed), seizure frequently occurred on the liner portion of the bearing as time passed. However, when lubrication was performed, no seizure was observed at all.

[Effects of the Invention] The present invention makes it possible to adjust both the horizontal bending force and the roll offset amount of a roll during rolling. Therefore, high-precision control becomes possible, and a required plate shape, plate crown and edge drop can be obtained. Further, by supplying the lubricant, the frictional resistance of the sliding surface can be reduced, seizure can be prevented, and troubles in controlling the thickness and changing the rolls can be prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a quadruple rolling mill of the present invention, FIG. 2 is a side view of FIG. 1, FIG. The figure is a side view of FIG. DESCRIPTION OF SYMBOLS 1 ... Housing, 2 ... Housing post, 3 ... Work roll, 7 ... Intermediate roll, 9 ... Backup roll, 11 ... Bearing box, 15 ... Horizontal roll bender, 16 ...
... Hydraulic cylinder, 18 ... Roll offset adjustment device,
19 ... wedge, 20 ... hydraulic cylinder, 25 ... vertical roll bender, 26 ... hydraulic cylinder, 31 ... lubrication device, 33 ... lubrication pump.

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Matsuo Ataka 1-1-1 Emitsu, Yawatahigashi-ku, Kitakyushu-shi, Fukuoka Prefecture Nippon Steel Corporation 3rd Technical Research Institute (56) References JP-A-64-15204 (JP, A)

Claims (2)

(57) [Claims] A wedge slidably inserted between a housing post and a bearing box of a rolling mill having a horizontal roll bender for applying a horizontal bending force to a horizontally offset roll. And a roll offset adjusting device comprising a drive device for moving a wedge between a housing post and a bearing box. 2. A device for supplying lubricant to a sliding surface between a holding portion of the horizontal roll bender and a housing post and a sliding surface between a wedge of the roll offset adjusting device, a housing post, and a bearing box. The plate rolling mill according to claim 1, further comprising: