JP4096189B2 - Sheet rolling method using cluster rolling mill - Google Patents

Description

The present invention relates to a rolling method of the plate using a cluster mill to perform shape control of the sheet material with high accuracy.

  The cluster rolling mill is a rolling mill for rolling a thin plate having a thickness of several μm to 20 μm, and is a multistage rolling mill having a pair of work rolls and two or more pairs of backup rolls. The work roll of such a cluster rolling mill has an elongated shape with a diameter of 50 mm and a width of 1000 mm, for example, because it is elastically deformed by a large-diameter work roll and a thin plate cannot be rolled. Therefore, there is a problem that the work roll is easily bent. Therefore, in order to eliminate the bending, the work roll is supported by two or more pairs of backup rolls (see Patent Documents 1 and 2).

  Further, in order to roll a thin plate material, the plate shape accuracy of the product is highly required, and therefore the cluster rolling mill is provided with a roll crown control mechanism.

  For example, the cluster rolling mill described in Patent Document 1 shown in FIG. 4 employs a split roll obtained by dividing the central backup roll 40 in the axial direction. Each of the split rolls (center backup roll 40) is supported by a saddle 41 so as to be freely rotatable, and the saddle 41 can be independently moved in the vertical direction to adjust the crown. In FIG. 4, 42 is a second intermediate roll, 43 is an outer peripheral surface of the end of the second intermediate roll, 44 is a backup roll disposed on both the left and right sides, and 45 is a bearing of a backup roll disposed on both the left and right sides. .

  Although not shown, in the cluster rolling mill described in Patent Document 2, a pressure chamber is provided in the roll, a high pressure medium is supplied to the pressure chamber by the medium pressurizing unit, and the crown amount of the roll is controlled. It has become.

Japanese Patent Laid-Open No. 5-92202

Japanese Patent Publication No. 60-36322

However, the roll crown control mechanism of the cluster rolling machine described above has the following problems.
(1) The split rolls are provided with split saddles that can be moved in the vertical direction independently of each roll. Therefore, the structure is complicated, and much labor and time are required for maintenance and inspection work.
(2) Only the roll that can be expanded and contracted had few crown control patterns, and the shape control was insufficient. This was particularly noticeable at the end of the plate in the width direction.

The present invention has been developed to solve such problems. An object of the present invention is to provide a rolling method of the plate using a cluster mill which can perform increase crown control pattern with a simple structure, the shape control of the sheet with high accuracy.

According to the reference example , in the cluster rolling mill having a pair of work rolls and two or more pairs of backup rolls, at least one of the backup rolls is configured to be able to expand or contract in the radial direction, and the work rolls A cluster rolling mill is provided, characterized in that a bending apparatus is installed.

According to the configuration of the above reference example , the expansion / contraction roll is adopted as the backup roll, and the bending unit is provided in the work roll, so that the shape of the central part in the width direction of the plate material can be controlled by the expansion / contraction roll. The shape of the end of the plate in the width direction can be controlled by a bending device.

In the reference example, a drive device that applies drive torque to the work roll is connected to the backup roll. With this configuration, it is not necessary to provide a driving device on the work roll, and no torsional moment is applied. Therefore, the bending load can be increased by that much, and the neck strength of the work roll can be increased. That is, the bending force applied to the work roll can be increased, and the shape control of the plate material can be widened.

Moreover, in the reference example, the coolant apparatus which cools or heats the said work roll is installed. With this configuration, the work roll crown control means can be increased, and the shape of the plate material can be controlled with higher accuracy.

  According to the present invention, in the rolling method of a plate material using a cluster rolling mill having a pair of work rolls and two or more pairs of backup rolls, at least one of the backup rolls expands or contracts in the radial direction. Thus, there is provided a rolling method for a plate material, characterized in that the crown control of the center portion of the plate material is performed, and the crown control of both ends of the plate material is performed by a bending device installed on the work roll.

  According to the configuration of the present invention, the shape of the central portion in the width direction of the plate material is controlled by the expansion / contraction roll, and the shape of the width direction end portion of the plate material is controlled by the bending device, thereby performing crown control of two or more patterns Can do.

(1) According to the above reference example, the structure is simple, and maintenance and inspection work are easy.
(2) According to the present invention, two or more patterns of crown control are possible, and the shape control of the plate material can be performed with high accuracy.

  The best mode for carrying out the present invention will be described below with reference to FIGS. In each figure, common portions are denoted by the same reference numerals, and redundant description is omitted.

Figure 1 is a front view of a cluster mill, FIG. 3 is an A-A arrow view in FIG. As shown in these figures, the cluster mill, a pair of work rolls 1a, a 1b, 2 pairs of backup rolls 2a, 2b, 3a, and a 3b, radially to one of the backup rolls 2a The bending device 4 is installed at the ends of the work rolls 1a and 1b, and the coolant device 5 for cooling or heating the work rolls 1a and 1b is installed. In FIGS. 1 and 3, illustrations of the bearings of each roll and the supporting members of the rolling mill are omitted.

  The backup roll 2a, which is an expansion / contraction roll, has a pressure chamber 7 therein, and high pressure oil is supplied to the pressure chamber 7 from an external hydraulic source via a conduit 8. The pressure chamber 7 is a cylindrical space formed substantially concentrically with the backup roll 2a, and expands or contracts radially outward. The conduit 8 is inserted into the roll from the end of the roll, branches at a substantially central portion of the roll, and supplies the hydraulic pressure evenly to the pressure chamber 7. The hydraulic pressure source is connected to a control device (not shown), and roll crown control is performed by adjusting the hydraulic pressure supplied to the pressure chamber 7. Although not shown, a piston having a tapered tip is installed in the pressure chamber 7, and the tip is slid by supplying hydraulic pressure to the piston to expand and contract the outer peripheral surface of the backup roll 2a. You may make it make it.

  By adopting such an expansion / contraction roll, the structure is simple and maintenance and inspection work is facilitated as compared with a cluster rolling mill that employs a conventional split roll. Here, the case where only the backup roll 2a is an expansion / contraction roll has been described, but the backup rolls 2a, 2b may be expansion / contraction rolls, or all backup rolls may be expansion / contraction rolls.

  The bending device 4 is a hydraulic cylinder connected to the ends of the work rolls 1a and 1b, and adjusts the roll bend by controlling the hydraulic pressure supplied to the hydraulic cylinder. The expansion / contraction of the backup roll 2a is mainly suitable for crown control of the central portion in the width direction of the roll. The bending device 4 is mainly suitable for crown control of both ends in the width direction of the roll. Yes.

  As shown in FIG. 3, the coolant device 5 is installed on the upstream side in the plate material traveling direction, and includes a coolant nozzle and a coolant header that supplies cold water or hot water to each nozzle. By cooling or heating the work rolls 1a and 1b with the coolant device 5, roll crown control of the work rolls 1a and 1b can be performed.

The cluster rolling machine is preferably a backup roll drive type. If the backup roll drive type is adopted, it is not necessary to provide a drive device for the work roll, and no torsional moment is applied. Therefore, the bending load can be increased correspondingly, and the neck strength of the work roll can be increased. That is, the bending force applied to the work roll can be increased, and the shape control of the plate material can be widened. Specifically, the drive device 6 is connected to the backup rolls 2 a and 2 b via the universal joint 9 and the spindle 10. The drive device 6 may be connected to another backup roll 3a, 3b.

FIG. 2 is an explanatory diagram of a method for rolling a plate material using the above-described cluster rolling mill. In FIG. 2, only the work roll 1a and the backup roll 2a are shown for convenience of explanation. The above-described cluster rolling machine is for rolling a thin plate having a thickness of several μm to 20 μm, and a large-diameter work roll causes elastic deformation and cannot be sufficiently rolled. Therefore, a small-diameter work roll is used. It is done. In the case of a small-diameter work roll, the work roll is supported by two or more backup rolls because bending is likely to occur (see FIG. 3).

When rolling the plate material in the cluster rolling mill shown in FIGS. 1 and 3, in order to rolling the desired thinness, it is necessary to perform the roll crown control. When the center part in the width direction of the plate material to be rolled is thicker than a desired plate thickness, the outer shape of the backup roll 2a is expanded radially outward by supplying oil to the pressure chamber 7 from the hydraulic source. Thereby, the center part of the work roll 1a is deformed in a direction in which the plate material is pressed against the lower work roll. However, since the shape control of the roll end portion is not sufficient by itself, in the present invention, the bending device 4 presses both ends of the work roll 1a against the backup roll 2a by applying a force in the direction indicated by F in the figure. Like that. Thereby, the roll crown of the work roll 1a can be sufficiently controlled, and the plate material can be rolled to a desired plate thickness. That is, according to the rolling method of the plate material of the present invention, two or more patterns of crown control are possible, and the shape control of the plate material can be performed with high accuracy.

  In addition, this invention is not limited to embodiment mentioned above, Of course, it can change variously in the range which does not deviate from the summary of this invention.

It is a front view of a cluster mill. It is explanatory drawing of the rolling method of the board | plate material using the cluster rolling mill of FIG. It is an AA arrow line view in FIG. It is a figure which shows the conventional cluster rolling mill.

Explanation of symbols

1a, 1b Work rolls 2a, 2b, 3a, 3b Backup roll 4 Bending device 5 Coolant device 6 Drive device 7 Pressure chamber 8 Conduit 9 Universal joint 10 Spindle 40 Backup roll (split roll)
41 Saddle 42 Second intermediate roll 43 Outer peripheral surface 44 of second intermediate roll end portion Backup roll 45 arranged on both left and right sides Backup roller bearings arranged on both left and right sides

Claims (3)

In the rolling method of a plate material using a cluster rolling mill having a pair of work rolls and two or more pairs of backup rolls,
Performing crown control of the central portion of the plate material by expanding or contracting at least one of the backup rolls in the radial direction,
A rolling method for a plate material, wherein crown control of both ends of the plate material is performed by a bending device installed on the work roll. The method for rolling a plate material according to claim 1, wherein roll crown control of the work roll is performed by cooling or heating the work roll with a coolant device. 3. The plate material rolling method according to claim 1, wherein a driving torque is applied to the backup roll by a drive device connected to the backup roll.

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