JPH05237511A - Rolling mill - Google Patents

Abstract

PURPOSE:To reduce a thrust given to work rolls by crossing a pair of work rolls with a pair of backup rolls and making a cross angle between the backup rolls smaller than a cross angle between the work rolls. CONSTITUTION:Since the work rolls 1, 2 are inclined to both rolled stock 10 and backup rolls 3, 4, the work rolls 1, 2 receive thrusts F1, F2 opposite to each other from both rolled stock 10 and backup rolls 3, 4, but since the cross angle theta1, between the backup rolls is set smaller than the cross angle theta2 between the work rolls, the relative inclination theta5 of the work rolls 1, 2 to the backup rolls 3, 4 decreases, therefore, the thrust applied by the backup rolls 3, 4 to the work rolls is reduced to as much as the thrust given from the rolled stock 10 and both thrusts are cancelled to diminish the thrust applied to the work rolls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called roll cross rolling machine of the type in which rolling rolls are crossed.

[0002]

2. Description of the Related Art As is well known, in a rolling mill, it is important to secure the thickness uniformity of the rolled material in the plate width direction.
Conventionally, for example, a roll bending method for bending a rolling roll, a roll shift method for axially shifting the rolling roll, and a method for controlling the rolling roll by changing the crown shape of the rolling roll have been put into practical use. , Among them, the rolling rolls are slightly tilted in the horizontal plane with respect to the horizontal line perpendicular to the pass line, that is, the rolling rolls are slightly tilted without being parallel to the strip width direction to cross the upper and lower rolling rolls. It is said that the roll cross type is effective.

2 to 4 show a conventional roll cloth rolling machine in which a roll cloth system is applied to a quadruple rolling machine having upper and lower work rolls 1 and 2 and upper and lower backup rolls 3 and 4 for reinforcing them. It shows an example. Each of these figures schematically shows the inclined state of the axis of each of the rolls 1 to 4, wherein (a) is a side view and (b) is a plan view showing only the axis. Reference numeral W ₁ indicates the axis of the upper work roll 1, W ₂ indicates the axis of the lower work roll 2, B ₁ indicates the axis of the upper backup roll 3, and B ₂ indicates the axis of the lower backup roll 4. p is the pass line, 10
Is a rolled material.

As is clear from these figures, the one shown in FIG. 2 is of the type in which only the work rolls 1 and 2 are crossed, and the one shown in FIG. 3 is of the type in which only the backup rolls 3 and 4 are crossed. The one shown in FIG. 4 is an upper work roll 1, an upper backup roll 3, and a lower work roll 2.
And a lower backup roll 4 are crossed as a pair, which is a so-called pair cross mill.

[0005]

By the way, in the roll cross rolling machine of the type shown in FIG. 2, since the work rolls 1 and 2 are inclined with respect to the rolled material 10, the work rolls 1 and 2 are The work rolls 1 and 2 receive the axial thrust force f ₁ from the rolled material 10 due to relative slippage between the rolled material 10. At the same time, work rolls 1 and 2
Is inclined with respect to the backup rolls 3 and 4, the work roll 1 from the backup roll 3
The work rolls 2 receive the thrust force f2 from the backup rolls 4, respectively. In this case, the directions of the thrust forces f ₁ and f ₂ are opposite to each other, but the rolled material 1
0 between the work rolls 1 and 2, the lubricant ensures sufficient lubrication, while the work rolls 1, 2
Since there is not much lubrication between the backup rolls 3 and 4 and the backup rolls 3 and 4, the thrust force f _{2 that} the work rolls 1 and 2 receive from the backup rolls 3 and 4 due to the difference in the friction coefficient between the two rolls. It becomes much larger than the thrust force f ₁ received from the material 10, and in the end, an excessive thrust force is applied to the work rolls 1 and 2. Therefore, in this type of rolling mill, the power loss is increased due to the large thrust force applied to the work rolls 1 and 2, and the bearing strength needs to be increased.

Further, in the roll cross rolling machine of the type shown in FIG. 3, no thrust force is generated between the work rolls 1, 2 and the rolled material 10, but the work rolls 1, 2 and the backup rolls 3, 4 are In between, thrust force f similar to the above
_The situation is exactly the same because the ₂ occurs. Further, in the pair cross mill of the type shown in FIG. 4, no thrust force is generated between the work rolls 1 and 2 and the backup rolls 3 and 4, but between the work rolls 1 and 2 and the rolled material 10. Since the thrust force f ₁ is generated, the same problem as in the above case occurs to some extent.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rolling machine of roll cross type capable of reducing the thrust force acting on a work roll.

[0008]

SUMMARY OF THE INVENTION The present invention has a pair of work rolls and a pair of backup rolls that reinforce them, and both work rolls and backup rolls are horizontal with respect to a horizontal line perpendicular to the pass line. The work rolls and the backup rolls are made to cross each other in a plan view by inclining inside, and the cross angle between the backup rolls is set smaller than the cross angle between the work rolls. ..

[0009]

Since the work roll in the rolling mill of the present invention is inclined with respect to both the rolled material and the backup roll, the work roll receives thrust forces in opposite directions from both the rolled material and the backup roll. But,
Since the cross angle between the backup rolls is set to be smaller than the cross angle between the work rolls, the relative inclination angle between the backup roll and the work roll becomes smaller, which results in the thrust force that the work roll receives from the backup roll. Is reduced to the same extent as the thrust force received from the rolled material, and the thrust forces of both of them are canceled to substantially reduce the thrust force applied to the work roll.

[0010]

Embodiments of the present invention will be described below with reference to FIG. FIG. 1 shows each roll 1 to 4 in the rolling mill of this embodiment.
FIG. 2 shows the tilted states of the respective axis lines W ₁ , W ₂ , B ₁ , B ₂ of FIG.
4 is similar to FIG.

The rolling mill of this embodiment is a quadruple rolling mill equipped with work rolls 1 and 2 and backup rolls 3 and 4 as in the conventional rolling mill, and the work rolls 1 and 2 and backup roll All of the rolls 3 and 4 are inclined in the horizontal plane with respect to the straight line m in the horizontal direction (the plate width direction of the rolled material 10) perpendicular to the pass line p, and the work rolls 1 and 2 and the backup rolls 3, Although all 4 are crossed in plan view, in the rolling mill of the present embodiment, as shown in FIG. 1B, the cross angle θ between the backup rolls 3 and 4 is ₁ is set smaller than the cross angle θ ₂ between the work rolls 1 and 2. In other words,
The inclination angle θ ₃ of the backup rolls 3 and 4 with respect to the straight line m is set smaller than the inclination angle θ ₄ of the work roll with respect to the straight line m.

In the rolling machine having the above construction, the work rolls 1,
The thrust force applied to 2 can be reduced substantially substantially. That is, also in the rolling mill of this embodiment, since the work rolls 1 and 2 are inclined with respect to the rolled material 10, the work rolls 1 and 2 receive the thrust force f ₁ from the rolled material 10 and the work roll 1 , 2
And the backup rolls 3 and 4 are relatively inclined, the work rolls 1 and 2 are the backup rolls 3 and 4.
The thrust force f ₂ in the reverse direction is also received from 4,
This point is similar to the conventional one shown in FIG. However, in the present embodiment, since the cross angle θ ₁ of the backup rolls 3 and 4 is smaller than the cross angle θ _{2 of} the work rolls 1 and 2, the work roll 1, the backup roll 3, and the work roll 2 are The inclination angle θ ₅ relative to the backup roll 4 is smaller than that shown in FIG. 2, so the thrust force f ₂ generated between them is also small. Then, in consideration of the difference between the coefficient of friction between the work rolls 1 and 2 and the backup rolls 3 and 4, and the difference between the coefficient of friction between the work rolls 1 and 2 and the rolled material 10, the work rolls 1 and 2 are backed up. By appropriately setting the relative inclination angle θ ₅ with respect to the rolls 3 and 4, the thrust force f ₂ generated between them is the reverse thrust force f generated between the work rolls 1 and 2 and the rolled material 10. It is possible to make it approximately equal to _1, and by doing so, the thrust forces f ₁ and f ₂ of both sides are canceled out,
The substantial thrust force applied to the work rolls 1 and 2 can be remarkably reduced.

As will be apparent from the above description, in the rolling mill of the present invention, the relative inclination angle θ ₅ between the work rolls 1 and 2 and the backup rolls 3 and 4 is shown in FIGS. 2 and 3. By making it smaller than the conventional one shown, not only the substantial thrust force applied to the work rolls 1 and 2 can be reduced, but also the thrust force that the backup rolls 3 and 4 receive from the work rolls 1 and 2. There is an advantage that (the reaction force of the thrust force f ₂ ) is also reduced. Further, in comparison with the conventional paired cross mill shown in FIG. 4, the backup rolls 3 and 4 have work rolls 1 and 2.
However, since the backup rolls 3 and 4 have a larger diameter than the work rolls 1 and 2, the backup rolls 3 and 4 are less likely to be adversely affected by the thrust force, and their countermeasures are easy. Therefore, the thrust force applied to the work rolls 1 and 2 is offset and reduced, which is more advantageous, and the rolling mill of the present invention is also effective as compared with the pair cross mill.

[0014]

As described above, according to the present invention, the work rolls and the backup rolls are made to cross each other in a plan view, and the cross angle between the backup rolls is set smaller than the cross angle between the work rolls. Therefore, the thrust force that the work roll receives from the backup roll and the thrust force in the reverse direction that the work roll receives can be made approximately equal,
Therefore, it is possible to cancel the thrust forces of both of them and to significantly reduce the thrust force substantially applied to the work roll as compared with the conventional general roll cross rolling mill.
There is an advantage that.

[Brief description of drawings]

FIG. 1 is a side view and (b) is a plan view showing an inclined state of an axis of each roll in a roll cloth rolling mill which is an embodiment of the present invention.

2A and 2B show the state of inclination of the axis of each roll in a conventional roll cloth rolling mill, in which FIG. 2A is a side view and FIG.
Is a plan view.

FIG. 3 is a side view showing an inclined state of the axis of each roll in another conventional roll cloth rolling mill,
(B) is a plan view.

FIG. 4 is a side view and (b) is a plan view showing an inclined state of an axis of each roll in still another conventional roll cloth rolling mill.

[Explanation of symbols]

1, 2 Work rolls 3, 4 Backup rolls 10 Rolled material p Pass line θ ₁ Cross angle between backup rolls θ ₂ Cross angle between work rolls

Claims (1)

[Claims] 1. A work roll having a pair of work rolls and a pair of backup rolls for reinforcing the work rolls, both of which are inclined in a horizontal plane with respect to a horizontal line perpendicular to the pass line. A rolling mill characterized in that each of the backup rolls and the backup rolls are crossed in a plan view, and the crossing angle of the backup rolls is set to be smaller than the crossing angle of the work rolls.