JPH0631309A - 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 and design of bearings are easy. CONSTITUTION:Intermediate rolls 6, 7 are interposed between upper and lower back-up rolls 2, 3 and upper and lower work rolls 4, 5. Respective roll chocks 14, 10 of the upper work roll 4 and the intermediate roll 6 are engaged integrally in the line direction and freely movably in the vertical direction and also the respective roll chocks 11, 15 of the lower work roll 5 and the intermediate roll 7 are similarly engaged. A roll inclining device 18 with which the upper work roll 4, intermediate roll 6 and the lower work roll 5, intermediate roll 7 are crossed by respectively inclining a group of the engaged upper roll chocks 14, 10 and a group of the lower engaged chocks 11, 15 in the direction opposite to the line direction is provided.

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 in which intermediate rolls are interposed between upper and lower holding rolls and upper and lower work rolls, and each roll chock of an upper work roll and an intermediate roll. Is engaged in the line direction integrally and displaceably in the vertical direction, each work roll of the lower stage and each roll chock of the intermediate roll are engaged in the same manner as the upper stage, and the engaged upper stage roll chock set and the lower stage It is characterized in that a roll inclining device for tilting the roll chock set in the opposite direction of the line direction to cross the upper work roll and the intermediate roll and the lower work roll and the intermediate roll is provided.

[0009]

Therefore, according to the present invention, the roll chocks of the upper work roll and the roll chock of the intermediate roll are engaged integrally in the line direction so as to be displaceable in the vertical direction. Therefore, when the upper roll chock set and the lower roll chock set engaged by the roll tilting device are respectively tilted in the opposite directions of the line direction, the upper work roll and the intermediate roll, and the lower work roll. And the intermediate roll are tilted and crossed together.

When the rolled material is rolled by crossing in this way, the intermediate rolls that do not come into direct contact with the rolled material are less rough and worn than the work rolls. The coefficient of friction with the inclined intermediate roll 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.

[0012]

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.

Further, 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 formed.
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. So that the lower work roll 5 and the intermediate roll 7 can be inclined at the same angle to the opposite direction with respect to the inclination direction of the upper work roll 4 and the intermediate roll 6 through the roll chock 11 in the same manner as the upper stage. I am doing it.

The roll inclining device 18 is composed of a hydraulic cylinder 19 which is provided in the cylinder box 17 and expands and contracts in the line direction, and a wedge liner inserting / removing mechanism 20 which is provided in the other cylinder box 17. Hydraulic cylinders 1 of the lower roll inclining devices 18, 18
9. The wedge liner insertion / removal mechanism 20 is arranged in the line direction at the working side and the driving side position in the roll axis direction, respectively.

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 imparting a bending force to the roll chock 11 of the lower work roll 5 is provided at the lower part 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.

Reference numeral 33 denotes a balance cylinder for the roll chock 10 of the upper intermediate roll 6 and 34 denotes a rolled material.

Thus, the hydraulic cylinders 19 of the roll inclining devices 18 and 18 push the push hooks 10 and 11 in opposite directions to the wedge liner insertion / removal mechanism 20 side in which the roll chocks 10 and 11 are arranged in opposite directions. While pressing the wedge liner insertion / removal mechanism 20 side that has been placed, the wedge liner 2
When 9 is inserted deeply between the cylinder box 17 and the roll chock 10 or 11 by the rotation of the lever 25 by the jack 30, each of the roll chocks 10 and 11 is tilted in the direction opposite to the line direction, and the upper work roll 4 and The intermediate roll 6 and the lower work roll 5 and the intermediate roll 7 are respectively tilted and crossed together.

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, so that 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.

In addition, 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-mentioned 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.

Further, the roll chock 14 of the work roll 4 is fitted to the roll chock 10 of the intermediate roll 6 in the upper stage so as to be tilted integrally, and the roll chock 11 of the intermediate roll 7 is similarly fitted to the roll chock 11 of the work roll 5 in the lower stage. Since they are fitted, the roll tilting device 18, 18
By tilting each of the roll chocks 10 and 11 in the direction opposite to the line direction, the upper work roll 4 and the intermediate roll 6 and the lower work roll 5 and the intermediate roll 7 can be easily tilted integrally. Can be crossed.

Even when the upper work roll 4 has a small diameter as shown in the drawing, the roll chock 1 of the work roll 4 is also used.
Roll chock 11 of the lower work roll 5 adjacent to 4
By providing the bending cylinder 32 on the upper portion, the bending force can be easily applied.

Further, in general, the smaller the work roll diameter is, the smaller the diameter of the rolling load and the edge drop can be obtained. Therefore, 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.

Further, 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 and the lower stage work roll 5 are operated. The spindle diameter D _s can be made larger than the roll diameters D ₁ and D ₂ of the roll 5.

In the present 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 medium 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, and recesses 12 and 1 are formed in the upper and lower portions of the roll chocks 14 and 11 of the upper and lower work rolls 4 and 5 having the medium diameter, respectively.
3 is fitted with the roll chocks 10 and 15 of the upper and lower intermediate rolls 6 and 7 having the small diameter, or FIG.
As shown in FIG. 5, 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 small diameter, and the lower intermediate roll 7 has a medium diameter. The roll chocks 14 and 11 of the upper and lower work rolls 4 and 5 having the small diameter may be fitted in the recesses 12 and 13 formed in the lower and upper portions of the roll chocks 10 and 15 of the intermediate rolls 6 and 7, respectively.

The rolling mill of the present invention is not limited to the above-described embodiment, the roll inclining device is not limited to the illustrated example, and other various modifications are possible without departing from the gist of the present invention. Of course, changes can be made.

[0032]

According to the rolling mill of the present invention described above, various excellent effects as described below can be obtained.

(I) Since the work rolls can be crossed together with the intermediate rolls while holding the large diameter backing rolls at right angles to the line direction, rolling can be carried out without any trouble. The manufacturing cost can be kept low compared to the cross structure, and the existing rolling mill can be easily modified.

(II) The roll chocks of the upper work roll and the roll chock of the intermediate roll are engaged integrally in the line direction so as to be displaceable in the vertical direction, and the roll chocks of the lower work roll and the roll chock of the intermediate roll are similarly engaged. Therefore, the upper roll chock set and the lower roll chock set engaged by the roll inclining device are respectively tilted in the opposite directions in the line direction, so that the upper work roll and the intermediate roll, and the lower work roll. The intermediate roll and the intermediate roll can be tilted integrally and easily crossed.

[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 backing roll 3 backing roll 4 work roll 5 work roll 6 intermediate roll 7 intermediate roll 10 roll chock 11 roll chock 14 roll chock 15 roll chock 18 roll tilting device

Claims (1)

[Claims] 1. A six-high rolling mill having intermediate rolls interposed between upper and lower holding rolls and upper and lower work rolls, wherein roll chocks of the upper work roll and the intermediate roll are integrally and vertically arranged in the line direction. Direction, the lower work roll and the intermediate roll are engaged in the same manner as in the upper stage, and the engaged upper roll chock set and the lower roll chock set are respectively reversed in the line direction. A rolling mill provided with a roll inclining device that tilts in a direction to cross the upper work roll and the intermediate roll and the lower work roll and the intermediate roll.