JP3132526B2 - Different speed rolling method and different speed rolling mill - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a different speed rolling method and a different speed rolling mill in which upper and lower work rolls are driven at different peripheral speeds to perform rolling. The roll gap distribution can be controlled by adjusting the amount of bending in the horizontal direction, and the control range of the roll crown can be expanded.

[0002]

2. Description of the Related Art Various methods have conventionally been proposed for controlling the shape of a rolled product. The most commonly employed work roll bending has been to bend each of work roll chocks which support upper and lower work rolls. The cylinders are connected, and the work rolls are bent by hydraulic pressure or the like to control the roll gap between the work rolls.

[0003]

However, in this work roll bending, the shape control ability is insufficient unless the roll diameter is within a predetermined range with respect to the roll body length. For example, the work roll diameter is reduced. Even if the work roll is easily bent, the bending force acts only on the shaft end,
There is a problem that a good bending shape cannot be obtained, and the range in which the plate shape can be controlled is limited.

In addition to such work roll bending, as equipment for controlling the shape of a rolled product, there are a cross mill in which upper and lower work rolls are slightly crossed to change the gap distribution between rolls, and an intermediate roll of a six-high rolling mill. HC mills that shift and control, work roll shift mills that shift the work rolls of four-high rolling mills, VC rolls that shrink sleeves to backup rolls and control the swelling of the sleeves by hydraulic pressure are being adopted. These methods also have a problem that the control range of the plate shape is similarly limited.

The present invention has been made in view of the above-mentioned problems in the prior art, and uses the tangential torque applied to the work rolls by driving the upper and lower holding rolls at different peripheral speeds, thereby utilizing the roll gap distribution between the work rolls. And to provide a variable speed rolling method and a variable speed rolling mill capable of expanding the control range of the roll crown.

[0006]

SUMMARY OF THE INVENTION In order to solve the problems of the above prior art, the variable speed rolling method according to the present invention employs a vertical work roll driven at different peripheral speeds and a vertical work roll contacting the same. When performing rapid rolling, the upper and lower work rolls are offset with respect to a line connecting the axes of the upper and lower holding rolls, and the tangential torque applied to the upper and lower working rolls is controlled by controlling different peripheral speeds of the upper and lower holding rolls. Rolling is performed by changing the roll gap distribution.

Further, the variable speed rolling mill according to the present invention is a variable speed rolling mill having upper and lower work rolls and upper and lower holding rolls in contact with these work rolls and driven at different peripheral speeds. A control for offsetting the upper and lower work rolls with respect to a line connecting the cores, changing a circumferential speed of the upper and lower holding rolls different from each other, adjusting a tangential torque applied to the upper and lower work rolls, and controlling a roll gap distribution. A means is provided.

[0008]

According to this variable speed rolling method, when the upper and lower control rolls are driven at different peripheral speeds, a difference is generated in the tangential torque applied to the upper and lower work rolls, whereby the work rolls are bent in the horizontal direction. By controlling the different peripheral speeds of the upper and lower retaining rolls, the distribution of the gap between the work rolls arranged offset with respect to the upper and lower retaining rolls is changed so as to expand the adjustment range of the roll crown. I have.

Further, according to this variable speed rolling mill, when the upper and lower retaining rolls are driven at different peripheral speeds, a difference occurs in the tangential torque applied to the upper and lower work rolls, whereby the work rolls are bent in the horizontal direction. For use, control means for controlling different peripheral speeds of the upper and lower holding rolls are provided, and the tangential torque applied to the upper and lower work rolls is changed by controlling the peripheral speed, and offset with respect to the upper and lower holding rolls. The distribution of the gap between the arranged work rolls is changed to expand the adjustment range of the roll crown.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view of the principle according to one embodiment of the different peripheral speed rolling method of the present invention, and FIG. 2 is a perspective view of a schematic configuration according to one embodiment of the different peripheral speed rolling mill of the present invention.
The different peripheral speed rolling mill 10 to which this different peripheral speed rolling method is applied,
For example, the present invention is applied to a four-high rolling mill as shown in FIG.
The upper and lower holding rolls 13 and 14 are provided with independent driving mechanisms 15 and 16, respectively, and the upper and lower working rolls 11 and 12 that are in contact with the upper and lower holding rolls 13 and 14 are driven. The driving is performed at different peripheral speeds V1 and V2 via the control device 17, and the peripheral speeds V1 and V2 can be controlled.

In this different peripheral speed rolling mill 10, as shown in FIG.
14 are offset by L1 and L2 with respect to the line L connecting the axes of the fourteen axes. For example, while the upper work roll 11 is offset by L1 on the input side, the lower work roll 12 is offset by L2 on the output side. It is.

In the different peripheral speed rolling mill 10 configured as described above, the upper and lower retaining rolls 13 and 14 are respectively driven by the driving mechanisms 15 and
When rotated at different peripheral speeds V1 and V2 by the upper and lower rollers 16, the upper and lower work rolls 11 and 12 that are in contact with the upper and lower rolls 13 and 14 are driven. You.

When the work rolls 11 and 12 are driven in this manner, as shown in FIG. 1 showing only the upper work rolls, portions of the upper and lower work rolls 11 and 12 that are in contact with the standby rolls 13 and 14 extend along the roll axis direction. Tangential torque T1, T2 with uniform distribution
Is added. On the other hand, since both ends of the work rolls 11 and 12 are supported by roll chocks (not shown), each of the work rolls 11 and 12 is bent in a horizontal direction around the center in the axial direction.

Therefore, if the tangential torque difference T1-T2 applied to the work rolls 11 and 12 driven via the backup rolls 13 and 14 is changed, the work rolls 11 and 1 are changed.
2 can be changed in the horizontal direction.
The different peripheral speed ratios V1 / V2 are changed by controlling the peripheral velocities V1 and V2 of the three and the fourteenth.

When the different peripheral speed ratio V1 / V2 is changed, as the different peripheral speed ratio V1 / V2 increases, a larger tangential torque T1 is applied to the retaining roll having a higher peripheral speed, for example, the upper work roll 11 in contact with the upper retaining roll 13. And the tangential torque T2 acting on the lower roll having a low peripheral speed, for example, the lower work roll 12 in contact with the lower lower roll 14, becomes smaller. When the different peripheral speed ratio V1 / V2 exceeds a certain value, the tangential torque becomes larger. The action direction of T1 and T2 may be reversed, and a state corresponding to the brake torque may be obtained.

By controlling the different peripheral speed ratio V1 / V2 in this manner, the amount of bending of the upper and lower work rolls 11, 12 in the horizontal direction and the direction thereof can be changed, and the upper and lower work rolls 11, 12 can be changed.
Since the upper and lower work rolls 11 and 12 are in a state of being offset in advance in consideration of the horizontal bending applied to the upper and lower work rolls 11 and 12, for example, as shown in FIG.
12 is bent in the opposite direction to enable rolling in a so-called middle elongation state as a roll gap distribution in which a center portion overlaps and both end portions are separated, or conversely, as shown in FIG. The roll can be rolled so that both ends overlap each other, and the ability to adjust the roll crown can be greatly expanded.

In this different peripheral speed rolling mill 10, since the upper and lower work rolls 11 and 12 are offset, a horizontal component force Fo due to the rolling force P also acts, so that an excessive torque reduces the rolling force. The offset amounts L1 and L2 of the work rolls 11 and 12 are adjusted so as to be adjusted by the received component force, and set at an appropriate position to cope with the problem.

In the above-described embodiment, the case where the roll gap distribution is adjusted by controlling the different peripheral speeds of the upper and lower rolls by the different peripheral speed rolling mill has been described. , VC roll (variable crown roll), work roll shift, T
You may make it combine with another system which controls a rolled plate shape, such as a P roll (taper piston roll).

Further, the different peripheral speed rolling method and the different peripheral speed rolling mill according to the present invention are not limited to the case where the present invention is applied to the quadruple rolling mill described in the above embodiment, but may be applied to an intermediate roll or a holding roll such as a six-roll rolling mill. The present invention can be applied to a rolling mill of a type driven via a roller, and can be combined with an intermediate roll shift or the like. .

Further, it goes without saying that various changes can be made to the components without departing from the gist of the present invention.

[0021]

As described above in detail with the embodiment, according to the different peripheral speed rolling method of the present invention, when the upper and lower retaining rolls are driven at different peripheral speeds, the difference in tangential torque applied to the upper and lower work rolls is reduced. This causes the work rolls to be bent in the horizontal direction, thereby controlling the different peripheral speeds of the upper and lower holding rolls. Can be changed, and the adjustment range of the roll crown can be greatly expanded.

Further, according to the variable speed rolling mill of the present invention, when the upper and lower control rolls are driven at different peripheral speeds, a difference is generated in the tangential torque applied to the upper and lower work rolls, whereby the work rolls are bent in the horizontal direction. In order to take advantage of this, control means for controlling different peripheral speeds of the upper and lower rolls are provided, so that the peripheral speed is controlled to change the tangential torque applied to the upper and lower work rolls, and the offset with respect to the upper and lower rolls is performed. It is possible to change the distribution of the gap between the rolls of the work rolls arranged in this manner, and it is possible to greatly increase the adjustment range of the roll crown.

[Brief description of the drawings]

FIG. 1 is a principle explanatory diagram according to an embodiment of a different peripheral speed rolling method of the present invention.

FIG. 2 is a perspective view of a schematic configuration according to an embodiment of the different peripheral speed rolling mill of the present invention.

FIG. 3 is an explanatory diagram of a state of action of force in one embodiment of the different peripheral speed rolling mill of the present invention.

FIG. 4 is an explanatory view of a state of upper and lower work rolls in one embodiment of the different peripheral speed rolling mill of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Different peripheral speed rolling mills 11, 12 Vertical work rolls 13, 14 Vertical control rolls 15, 16 Drive 17 Control device 18 Rolled material V1, V2 Peripheral speed of control rolls L1, L2 Offset amount of work rolls T1, T2 Work Tangent torque applied to roll

Claims (2)

(57) [Claims] 1. An upper and lower work roll which is driven at different peripheral speeds and is subjected to variable speed rolling by an upper and lower work roll in contact therewith, wherein the upper and lower work rolls are offset with respect to a line connecting the axes of the upper and lower hold rolls. In addition, a different speed rolling method characterized in that the rolling speed is controlled by controlling the tangential torque applied to the upper and lower work rolls by controlling different peripheral speeds of the upper and lower rolls to change the distribution of the roll gap. 2. A variable speed rolling mill comprising upper and lower work rolls and upper and lower holding rolls in contact with these work rolls and driven at different peripheral speeds. The work rolls are arranged in an offset manner, and control means for changing the circumferential speeds of the upper and lower holding rolls different from each other to adjust the tangential torque applied to the upper and lower work rolls to control the roll gap distribution is provided. Different speed rolling mill.