JP4425489B2 - Multi-stage rolling mill - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-stage rolling mill for controlling the shape of a material to be rolled in hot and cold rolling of a metal sheet.
[0002]
[Prior art]
Conventionally, in hot and cold rolling of a metal plate, the work roll is bent by a rolling load acting on the work roll from the material to be rolled, so that the rolled material has a shape such as an ear wave or a medium elongation. Defects occur. In order to suppress such a shape defect, in the 4Hi mill consisting of a pair of upper and lower work rolls and a pair of upper and lower backup rolls shown in FIG. 6, the roll bender force F is used to control the bending of the work rolls, I was trying to improve. However, in the shape of the 4Hi mill, since both ends of the body portion of the work roll are supported and restrained by both ends of the backup roll body portion, the work roll can be sufficiently bent by the roll bender force F. The shape control capability is insufficient.
[0003]
In view of this, rolling mills that further improve the ability to correct shape defects are disclosed in, for example, Japanese Patent Publication Nos. 50-19510 and 56-136207. Among these, as shown in FIG. 7, the rolling mill described in Japanese Patent Publication No. 50-19510 has a total of 6 upper and lower work rolls 1, 1 ′, upper and lower intermediate rolls 2, 2 ′, and upper and lower backup rolls 3, 3 ′. It consists of a 6Hi mil roll, and the shape of the material to be rolled is better controlled by moving the upper and lower intermediate rolls in the roll axis direction, thereby preventing shape defects.
[0004]
On the other hand, the rolling mill of Japanese Patent Laid-Open No. 56-136207 shown in FIGS. 8 and 9 is for supporting a backup roll chock in addition to a pair of upper and lower work rolls 1, 1 ′ and a pair of upper and lower backup rolls 3, 3 ′. Consists of rolling-down blocks 7 and 7 ', the upper and lower backup rolls are integrated with the respective chock, and the roll bender force F is improved by moving the rolling blocks 7 and 7' in the roll axis direction to be rolled. The shape of the material is prevented.
[0005]
[Problems to be solved by the invention]
However, in the multi-high rolling mill disclosed in the Japanese Patent Publication No. 50-19510, the length of the rolling mill is high because it is composed of six rolls as described above, and many rolling rolls are required. Is expensive. Further, in actual rolling operations, it is necessary to prepare and store a large number of preliminary rolls, and the number of turnings due to wear of the rolls is increased, resulting in high operating costs. Further, most of the types of existing rolling mills are the 4Hi, that is, rolling mills composed of four rolls, and the technical contents disclosed in the Japanese Patent Publication No. 50-19510 are applied to these. Incorporation of a book roll is difficult because of the space of the housing of an existing rolling mill, and even if it is remodeled, there is a problem that a very large remodeling costs a great amount of remodeling, which is not realistic.
[0006]
Further, in the rolling mill disclosed in Japanese Patent Application Laid-Open No. 56-136207, the number of rolls is four, but like the wide material shown in FIG. 9 (a) and the narrow material shown in (b), When the plate width of the material to be rolled changes, it is necessary to move the upper and lower backup roll chock in the opposite direction by β = (B−b) / 2 in order to control the shape of the material to be rolled. At this time, the core deviation δ between the rolling device and the back-up roll chock is increased, and when rolling is performed in this state, an uneven load due to a large rolling reaction force acts on the bearing built in the back-up roll chock, The bearing is damaged early. In order to prevent this, the rolling-down blocks 7 and 7 'are inserted between the rolling-down device 4 and the rolling-up device 5 and the backup roll chock 9 and 9' as described above. Thereby, compared with the general 4Hi mill demonstrated in the said FIG. 6, the length of a rolling mill becomes high, and the problem that a rolling mill becomes expensive similarly to the case of the above-mentioned Japanese Patent Publication No. 50-19510 gazette occurs.
[0007]
[Means for Solving the Problems]
The present invention solves the above-described problems, and an object of the present invention is to provide an inexpensive multi-high rolling mill that does not require a conventional reduction block and can control the shape of a material to be rolled in a 4Hi mill. At the same time, it can be easily applied to existing rolling mills. The gist of the invention includes a pair of upper and lower work rolls for rolling a metal plate, and a pair of upper and lower backup rolls for supporting the work roll, and the width direction of the metal plate to be rolled is In a multi-stage rolling mill that appropriately moves the barrel end of the backup roll to an appropriate position, a mechanism for moving the backup roll barrel end at an appropriate position integrally with the backup roll and the chock of the backup roll; and The multi-high rolling mill is characterized by comprising only means for moving the backup roll.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS.
First, the overall configuration of the multi-high rolling mill according to the present invention will be described with reference to FIGS. FIG. 1A shows an overall configuration diagram of the multi-stage rolling mill of the present invention when rolling a wide material, and FIG. 1B shows the entire multi-stage rolling mill of the present invention when rolling a narrow material. A block diagram is shown. In this figure, the multi-high rolling mill of the present invention is provided with a pair of upper and lower work rolls 1, 1 ′ in a housing composed of a DS housing 10 and a WS housing 11, and a pair of upper and lower backup rolls that support the work rolls. 3 and 3 ', the work rolls 1 and 1' are upper and lower work roll chock 8 and 8 ', and similarly the backup rolls 3 and 3' are upper and lower backup roll chock 9 and 9 ', respectively. It is supported. Further, a lowering device 4 and an uppering device 5 are provided on the upper and lower sides of the upper and lower backup roll chocks 9 and 9 ′, respectively, so as to be detachable. With the above configuration, the main part of the multi-high rolling mill of the present invention is configured.
[0009]
Next, the proper position moving mechanism for the back-up roll barrel end, which is the main part of the present invention, will be described.
The proper position movement mechanism of the backup roll barrel end is composed of two means: (1) means for moving the backup roll and the chock of the backup roll integrally, and (2) means for moving only the backup roll. Yes. Here, since the movement trajectories of the upper and lower backup rolls are in a point-symmetric relationship with each other, for convenience, the structure and operation will be described with reference to FIG. The above (1) and (2) will be described.
[0010]
First, means for integrally moving the backup roll (1) and the chock of the backup roll will be described. In FIG. 2, the chocks last case 18 of the upper backup roll chock 9 and the WS housing 11 are connected by an actuator 14, and the actuator 14 is hydraulically or electrically driven and controlled in the axial length direction of the upper backup roll 3. In this case, the housings 11 and 10 are fixed to the base of a rolling mill (not shown), and the upper backup roll 3 and the chock 9 of the backup roll are separated from the chock 9 of the backup roll by the advance / retreat force of the actuator 14. And the lower surface of the upper pressure reducing device 4 slide together, and both move together.
[0011]
Next, the structure and operation of the means for moving only the backup roll (2) will be described below with reference to FIGS.
FIG. 2 shows a structural diagram of the upper part of the multi-high rolling mill of the present invention, and FIG. 3 shows a view AA in FIG. 2 and 3, reference numeral 15 denotes a motor provided outside the chox last case 18, and a pinion 16 is attached to the output shaft of the motor 15. The pinion 16 meshes with a gear portion 17 a provided on the outer peripheral portion of an axial bearing case 17 in which the axial bearing 12 is built. The axial bearing case 17 meshes with the chox last case 18 and the screw portion 17b.
[0012]
In the above configuration, the pinion 16 is rotated by the motor 15 and the meshing axial bearing case 17 is rotated. As a result, the axial bearing case 17 rotates in the axial direction of the backup roll within the chox last case 18. . Since the backup roll 3 is axially restricted by the axial bearing 12 at the shaft end, only the backup roll 3 moves in the axial length direction of the roll as a result of the rotation of the pinion 16.
[0013]
In the above embodiment, the motor 15 is provided outside the chox last case 18, but the present invention is not limited to this. For example, the motor 15 may be provided in the WS housing 11. . As the motor 15, various types such as electric and hydraulic can be used. Further, as described above, as to the means for moving only the backup roll 3, as described above, the position of the axial bearing case 17 is directly controlled by a cylinder or the like, regardless of movement by a motor, a gear, a screw or the like. Is also possible. Further, according to this structure, as shown in FIG. 2, during rolling, the roller 13 moves in the axial direction while rolling between the inner ring 13a and the roller 13b, so that the resistance is low, and the backup roll is in a state of receiving a rolling load. The shape can be controlled by adjusting the position.
[0014]
A method of using the multi-high rolling mill of the present invention having the above configuration will be described below. First, the basic movement will be described with reference to FIGS. 1 (a) and 1 (b). FIG. 1A shows the rolling of a wide material, where the upper backup roll 3 is on the WS side and the lower backup roll 9 'is on the DS side. FIG. 1 (b) shows the rolling state of the narrow material, but in order to keep the distance δ between the body end face of the backup roll and the rolled plate end basically constant, the upper backup roll chock 9 is moved to the DS side. The lower backup roll chock 9 'is moved to the WS side, and only the backup rolls 3, 3' are moved in the same direction as the chock in the backup roll chock 9, 9 '.
[0015]
As is clear from FIG. 1, the core displacement α between the rolling-down devices 4 and 5 and the backup roll chock 9 and 9 ′ generated during the movement by the moving mechanism of the present invention is the conventional technique shown in FIG. It becomes about half of β described in b). In particular, when there is little fluctuation in the width of the rolled sheet, it is possible to eliminate the core shift α by moving only the backup rolls 3 and 3 ′.
The positioning of the backup roll chock may be performed by a constant pitch movement as shown in FIG. 4 in addition to the continuous adjustment as described above.
[0016]
FIG. 4 shows an AA arrow view of FIG. In this figure, A, B, and C show the recessed part provided in the backup roll chock 9 in the case of positioning in three places in the figure. Positioning of the backup roll chock 9 on the housing 11 after moving in the axial length direction of the roll is performed by a keeper plate 19 attached to the housing 11 and capable of moving forward and backward by the cylinder 20 with respect to the backup roll chock 9. This also makes it possible to maintain the thrust force that acts during rolling. Further, as another method for maintaining the thrust force acting during the rolling, for example, a thrust receiving angle disclosed in FIGS. 2 and 3 of JP-A-56-136207 may be provided.
[0017]
Next, when the backup roll chock positioning means shown in FIG. 4 is used, the operation explanation when combined with the moving means of only the upper backup roll 3 will be explained using FIGS. 5 (a), 5 (b) and 5 (c). To do. The positioning of the backup roll chock 3 is fixed at a position A for a wide material, a position B for a medium width, and a position C for a narrow width. Since the position adjustment at a small distance between A to B and C can be continuously performed by means for moving only the backup roll, the barrel end position of the backup roll can be arbitrarily set with respect to the plate width.
[0018]
As apparent from FIGS. 4 and 5, in the production of the rolling mill, the position of the moving means of the backup roll chock relative to the housing and the position of the moving means of only the backup roll 3 are the middle width of the figure. If it is set at the time of designing the rolling mill so that both are in the center, the misalignment can be reduced when the plate width is expanded or reduced. As a specific example of actual rolling in the multi-high rolling mill of the present invention, there is no reduction block that has been conventionally required by adopting the technique of the present invention for a rolled sheet material whose rolled sheet width varies between 600 and 1200 mm. Can be fully supported. In the above-described embodiment, the arrangement positions of the means for moving the backup roll and the chock of the backup roll integrally and the means for moving only the backup roll are both the WS side of the upper and lower backup rolls. However, in the present invention, the present invention is not limited to these and may be arranged together on the opposite DS.
[0019]
【The invention's effect】
As described above, according to the present invention, the proper position moving mechanism of the back-up roll barrel end portion includes a means for integrally moving the back-up roll and the chock of the back-up roll and a means for moving only the back-up roll. As a result, the entire movement of the roll chock assembly of the backup roll when the sheet width of the rolled material is changed and the movement of only the backup roll can be controlled independently. This minimizes the misalignment between the backup roll chock, the reduction and the reduction device, and the appropriate position of the end of the backup roll barrel can be adjusted to correspond to the plate width of wide to narrow materials without the need for a reduction block. It can be arbitrarily moved in the direction, and the shape of the material to be rolled can be easily controlled.
[0020]
Thus, since the reduction block that was necessary in the past is not necessary, it can be easily applied to an existing general 4Hi mill. In the case of a new rolling mill, the length of the rolling mill can be reduced, and the equipment size can be made as low as that of general 4Hi. In addition, it has means to move only the backup roll, and its configuration slides at the rolling bearing part, so the position of the backup roll in the axial direction can be adjusted while receiving the rolling load, and the shape control performance during rolling As a result, there are excellent effects such as an increase in the number.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram at the time of rolling a wide material and a narrow material of a multi-high rolling mill according to the present invention.
FIG. 2 is a configuration diagram of an upper portion of a multi-high rolling mill according to the present invention.
FIG. 3 is a view taken along arrow AA in FIG. 2;
4 is an AA arrow view of FIG. 1;
FIG. 5 is an operation diagram for a wide material, a medium narrow material, and a narrow material of the multi-high rolling mill according to the present invention.
FIG. 6 is an overall configuration diagram of a conventional 4Hi mill type multi-high rolling mill.
FIG. 7 is an overall configuration diagram of a conventional 6Hi mill type multi-high rolling mill.
FIG. 8 is an overall configuration diagram of a conventional 4Hi mill type multi-high rolling mill.
FIG. 9 is an operation diagram of a conventional multi-high rolling mill with a wide material and a narrow material of a 4Hi mill type.
[Explanation of symbols]
1 Upper work roll 1 'Lower work roll 2 Upper intermediate roll 2' Lower intermediate roll 3 Upper backup roll 3 'Lower backup roll 4 Lowering device 5 Pressing device 6 Conventional upper backup roll chock 6' Conventional lower backup roll chock 7 Lower pressure Block 7 'Lower pressure lower block 8 Upper work roll chock 8' Lower work roll chock 9 Upper backup roll chock 9 'Lower backup roll chock 10 DS housing 11 WS housing 12 Axial bearing 13 Radial bearing 13a Inner ring 13b Roller 14 Actuator 15 Motor 16 Pinion 17 Axial bearing case 17a Gear part 17b Screw part 18 Chocks last case 19 Keeper plate 20 Cylinder 21 Gear case

Claims (1)

It has a pair of upper and lower work rolls for rolling a metal plate and a pair of upper and lower backup rolls for supporting the work roll, and the body end of the backup roll is positioned in an appropriate position with respect to the width direction of the metal plate to be rolled. In the multi-stage rolling mill appropriately moved, the proper position moving mechanism of the backup roll barrel end is composed of means for integrally moving the backup roll and the chock of the backup roll and means for moving only the backup roll. A multi-stage rolling mill characterized by comprising.

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