JPH0631308A - Rolling mill - Google Patents

Abstract

PURPOSE:To provide a rolling mill having such a roll cross function that the manufacturing cost is inexpensive and the modification of an existing rolling mill is easy. CONSTITUTION:Intermediate rolls 6, 7 are respectively interposed between upper and lower back-up rolls 2, 3 and upper and lower work rolls 4, 5. The upper work roll 4 and intermediate roll 6 are composed so that respective axial centers are inclined at the same angle to the line direction around the respective mill center position from a position where respective axial centers are at right angle to the line direction. The lower work roll 5 and intermediate roll 7 are turned in the direction opposite to the inclining direction of the upper work roll 4 and intermediate roll 6 and composed so that they are inclined in the same way as the upper rolls.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling mill.

[0002]

2. Description of the Related Art In recent years, rolling mills have been developed in which work rolls are crossed in order to easily control the sectional shape of a rolled material such as a plate crown.

However, if the work roll is crossed as described above while the work roll is held at a right angle to the line direction, the surface of the work roll becomes rough and wear progresses, and the friction coefficient with respect to the work roll increases, so that the work roll becomes a work roll. Since the acting thrust force becomes large, the strength of the bearing of the work roll must be increased, and the bearing design becomes difficult because the thrust force and the bending force must be taken into consideration when designing.

Particularly in the case of hot rolling, since a rolled material having a high temperature passes between the work rolls, the increase in the friction coefficient becomes more remarkable due to the occurrence of heat cracks.

Therefore, as shown in the specification and drawings of JP-B-63-12687, the backing roll is crossed together with the work roll so that the thrust force does not act between the work roll and the backing roll. Considered a rolling mill.

[0006]

However, since the structure in which the large-diameter backing roll and the work roll are crossed in a pair is large-scaled, the manufacturing cost is inevitably high.
Moreover, it is difficult to modify the existing rolling mill.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rolling mill having a roll cross function, which is inexpensive to manufacture and is easy to modify an existing rolling mill.

[0008]

SUMMARY OF THE INVENTION The present invention is a six-high rolling mill having intermediate rolls interposed between upper and lower holding rolls and upper and lower work rolls. The lower work roll and the intermediate roll are constituted so that they can be inclined at the same angle in the line direction around the respective mill center positions from the position where the axis is perpendicular to the line direction, and It is characterized in that it can be tilted in the opposite direction to the tilt direction in the same manner as the upper stage.

[0009]

Therefore, according to the present invention, the upper work roll and the intermediate work roll are inclined at the same angle in the line direction about the mill center position from the position where their respective axes are at right angles to the line direction and the lower work roll and When the intermediate roll is directed in the opposite direction to the inclination direction of the upper work roll and the intermediate roll, and is inclined in the same manner as the upper roll, the upper work roll and the intermediate roll are crossed with the lower work roll and the intermediate roll. When rolling the rolled material in such a state, the intermediate rolls that do not come into direct contact with the rolled material are less rough and worn compared to the work rolls, so the auxiliary rolls arranged at right angles to the line direction and the inclined intermediate rolls are used. The coefficient of friction between and is small, and the thrust force acting on the intermediate roll is small. Therefore, the work rolls can be crossed without increasing the strength of the bearings of the work rolls.

Moreover, since the bearing of the work roll needs to bear the bending load and the bearing of the intermediate roll to bear the thrust load, the bearing of the work roll is designed in consideration of both loads as in the conventional case. Bearing design becomes easier by comparison.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention, in which 1 is an upper and lower holding rolls 2, 3 and an upper and lower work rolls 4, 4.
5 shows a 6-high rolling mill in which intermediate rolls 6 and 7 are interposed between the intermediate rolls 6 and 5, and in the illustrated example, the upper intermediate roll 6 has a medium diameter, the upper work roll 4 has a small diameter, and the lower work has a lower diameter. The roll 5 is formed to have a medium diameter, and the lower intermediate roll 7 is formed to have a small diameter. The upper intermediate roll 6 and the lower work roll 5 having the medium diameter are driven via spindles 8 and 9 at one ends thereof. A device (not shown) is connected.

Furthermore, the roll chocks 10 and 11 of the intermediate roll 6 of the upper stage and the work roll 5 of the lower stage, which have the above-mentioned medium diameter, are provided.
In the recesses 12 and 13 formed in the lower part of the roll chocks 14 of the work roll 4 and the intermediate roll 7 having the small diameter,
15 are fitted so as to be slidable in the vertical direction.

Further, the cylinder box 1 is provided on the housing posts 16, 16 at the front and rear positions in the line direction of the rolling mill 1.
7 and 17 are provided respectively, and the cylinder box 1
Roll inclining devices for inclining the work side and drive side roll chocks 10, 10 and 11, 11 of the upper intermediate roll 6 and the lower work roll 5 respectively in the upper and lower parts of 7, 17 in the opposite line directions. 18 and 18 are provided respectively, and the upper work roll 4 and the intermediate roll 6 through the roll chock 10 from the position where their respective axial centers are at right angles to the line direction with respect to the respective mill center positions in the line direction. And the lower work roll 5 and the intermediate roll 7 can be tilted at the same angle in the opposite direction to the tilt direction of the upper work roll 4 and the intermediate roll 6 via the roll chock 11. There is.

The roll inclining device 18 is composed of a hydraulic cylinder 19 which is provided in one cylinder box 17 and expands and contracts in the line direction, and a wedge liner inserting and removing mechanism 20 provided in the other cylinder box 17.
The hydraulic cylinder 19 and the wedge liner insertion / removal mechanism 20 of each of the upper and lower roll inclining devices 18, 18 are arranged opposite to each other in the line direction at the working side and the driving side position in the roll axial direction.

The tip of the piston portion 21 of the hydraulic cylinder 19 is formed into a spherical shape, and the roll chocks 10 and 11 are formed.
The wedge liner insertion / removal mechanism 20 is configured to be pressed against a spherical seat 22 formed on the contact surface of the bracket 23 and the pin 2 attached to the housing post 16.
A lever 25 whose central part is rotatably supported in the horizontal direction via a pin 4, and a base end rotatably supported in the horizontal direction via a pin 26 at one end of the lever 25 and inside the cylinder box 17. A wedge liner 29 having a sliding curved surface 28 along a guide curved surface 27 formed on a side surface and having a tip end side fitted between the cylinder box 17 and the roll chock 10 or 11 and the lever 25 are rotated. In order to obtain the above, the other end of the lever 25 is pin-connected to the other end and the base end is attached to the jack 30 which is attached to the housing post 16.

Further, a bending cylinder 31 for applying a bending force to the roll chock 11 of the lower work roll 5 is provided at the lower portion of each cylinder box 17, and above the roll chock 11 of the lower work roll 5 is provided. Is provided with a bending cylinder 32 that applies a bending force to the roll chock 14 of the upper work roll 4.

Incidentally, 33 is a balance cylinder for the roll chock 10 of the intermediate roll 6 in the upper stage, and 34 is a rolled material.

While the roll chockes 10 and 11 are being pressed by the hydraulic cylinders 19 of the roll tilting devices 18 and 18 toward the wedge liner insertion / removal mechanism 20 arranged in the opposite direction, the wedge liner 29 is levered by the jack 30. When it is inserted deeply between the cylinder box 17 and the roll chock 10 or 11 by the rotation of 25, each of the roll chocks 10 and 11 is tilted in the opposite direction of the line direction, and the upper work roll 4 and the intermediate roll 6 and the lower roll The work roll 5 and the intermediate roll 7 are tilted integrally and crossed.

In this state, the upper intermediate roll 6 and the lower work roll 5 are driven and the bending cylinder 3
Bending force is applied to the work rolls 4 and 5 by the rolls 1 and 32 to roll the rolled material 34.

At this time, the intermediate rolls 6, 7 which do not come into direct contact with the rolled material 34 as compared with the work rolls 4, 5 are less roughened or worn, and therefore, the auxiliary rolls 2, 3 arranged at right angles to the line direction and the above-mentioned inclinations. The friction coefficient between the intermediate rolls 6 and 7 is small, and the thrust force acting on the intermediate rolls 6 and 7 is small. Therefore, it is possible to cross the work rolls 4 and 5 without particularly increasing the strength of the bearings of the work rolls 4 and 5.

Moreover, the bearings of the work rolls 4 and 5 need to share the bending load, and the bearings of the intermediate rolls 6 and 7 need to share the thrust load. The bearing design is easier than in the case of designing the bearings of No.5 and No.5.

Therefore, according to the above-described embodiment, the work rolls 4 or 5 are crossed together with the intermediate rolls 6 or 7 while holding the large-diameter auxiliary rolls 2 and 3 at right angles to the line direction, and rolling is performed without any trouble. Since it can be performed, the manufacturing cost can be kept low as compared with the conventional structure in which a pair of work rolls are crossed, and the existing rolling mill can be easily modified.

In general, the smaller the work roll diameter is, the smaller the rolling load and the edge drop can be obtained. Therefore, both the upper and lower work rolls may be rolled as non-driving rolls having a small diameter. However, in this case, slipping may occur between the rolled material and the work roll when the rolled material is bitten or when the material is accelerated or decelerated. On the other hand, in this embodiment, since the lower work roll 5 is driven and the intermediate roll 6 is also driven, the rolling material 34 and the work rolls 4 and 5 are also interposed between the rolling material 34 during biting and acceleration / deceleration. The diameter of the work roll 4 in the upper stage can be reduced without causing slippage.

Furthermore, since there is a non-driving work roll 4 between the upper stage intermediate roll 6 and the lower stage work roll 5 to which the spindles 8 and 9 are connected, the upper stage intermediate roll 6 is described.
It is possible to make the spindle diameter Ds larger than the respective roll diameters D ₁ and D _{2 of the} lower work roll 5.

In this embodiment, the upper intermediate roll 6 has a medium diameter, the upper work roll 4 has a small diameter, the lower work roll 5 has a medium diameter, and the lower intermediate roll 7 has a small diameter. Of course, the same effect can be obtained even if the configuration for driving the intermediate roll 6 in the upper stage and the work roll 5 in the lower stage, which have the above-mentioned medium diameters, are upside down.

Further, the optimum example of the present invention has been described above. As shown in FIG. 4, the upper intermediate roll 6 has a small diameter, the upper work roll 4 has a middle diameter, and the lower work roll 5 has a small diameter.
To a medium diameter and the lower intermediate roll 7 is formed to a small diameter to drive the upper and lower work rolls 4 and 5 having the medium diameter. Alternatively, as shown in FIG. 5, the upper intermediate roll 6 has a medium diameter. , The upper work roll 4 has a smaller diameter, and the lower work roll 5
May be formed to have a small diameter, the lower intermediate roll 7 may be formed to have a medium diameter, and the upper and lower intermediate rolls 6 and 7 having the medium diameter may be driven.

The rolling mill of the present invention is not limited to the above-mentioned embodiment, but the roll chock of the upper intermediate roll and the work roll is fitted and the lower intermediate roll and the work roll roll chock are fitted. Other than mating
Each roll chock may be tilted by a separate roll tilting device, the roll tilting device is not limited to the illustrated example, and other various changes may be made without departing from the scope of the present invention. Of course.

[0029]

According to the above-described rolling mill of the present invention, it is possible to roll the work roll together with the intermediate roll while keeping the large-diameter backing roll at right angles to the line direction and perform rolling without any trouble. Therefore, as compared with the conventional structure in which a pair of work rolls are crossed with each other, the manufacturing cost can be kept low, and the existing rolling mill can be easily modified, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a view taken along the line II-II in FIG.

3 is a view in the direction of arrow III-III in FIG.

FIG. 4 is a schematic view showing another embodiment of the present invention.

FIG. 5 is a schematic view showing still another embodiment of the present invention.

[Explanation of symbols]

 1 rolling mill 2 upper backing roll 3 lower backing roll 4 upper working roll 5 lower working roll 6 upper middle roll 7 lower middle roll

Claims (1)

[Claims] 1. A six-high rolling mill in which intermediate rolls are respectively interposed between upper and lower holding rolls and upper and lower work rolls, and the axes of the upper work roll and the intermediate roll are perpendicular to the line direction. From the above position so that they can be inclined at the same angle in the line direction around their respective mill center positions, and the lower work roll and the intermediate roll are directed in the opposite direction to the inclination direction of the upper work roll and the intermediate roll. A rolling mill characterized in that it can be inclined like the upper stage.