JP3085757B2 - 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 rolling mill having a pair of work rolls and a pair of reinforcing rolls, and in particular, controls a shape of a material to be rolled by moving the reinforcing rolls in a plane including the material to be rolled. Rolling mill.

[0002]

2. Description of the Related Art In a rolling mill for rolling a sheet material, a work roll bends or bends due to a reaction force acting on the work roll from the material to be rolled, so that a sheet crown, an ear wave or an undulating wave is applied to the material to be rolled. Shape defects such as elongation occur.

As rolling mills for preventing the occurrence of such shape defects, Japanese Patent Publication No. 50-19510 and Japanese Patent Application Laid-Open No.
There is one described in JP-A-6-136207. Of these, the rolling mill described in Japanese Patent Publication No. 50-19510 is
It is composed of a total of six stages of upper and lower work rolls, upper and lower intermediate rolls, and upper and lower reinforcement rolls. By moving the upper and lower intermediate rolls in the roll axis direction, the shape of the material to be rolled is controlled, and the above-described shape defect is generated. Has been prevented. Also,
The rolling mill described in JP-A-56-136207 is composed of upper and lower working rolls and upper and lower reinforcing rolls that receive a rolling force directly from a rolling block with a roll chock, for a total of four stages. By moving the rolled material in the roll axis direction, the shape of the material to be rolled is controlled, and the above-described shape defects are prevented.

[0004]

SUMMARY OF THE INVENTION Among the above conventional examples, in a rolling mill described in JP-A-56-136207,
The contact between the roll chocks of the upper and lower reinforcing rolls and the vertical lowering block when the upper and lower reinforcing rolls are moved is a sliding contact between metals, and the friction coefficient is expected to be about 0.3. Therefore, in order to move the upper and lower reinforcing rolls in the roll axis direction, the assembly weight of the upper and lower rolls must be 100 Ton.
In this case, a moving force of 30 Ton is required, and the horizontality of the roll changes due to wear of the sliding surface, which causes the rolled material to meander. Therefore, in the conventional four-high rolling mill, it was difficult to move the reinforcing roll.

An object of the present invention is to reduce the friction coefficient of contact between the upper and lower roll chocks and the upper and lower pressing blocks by a simple plane bearing means, and to easily move the upper and lower reinforcing rolls for controlling the shape of the material to be rolled. The present invention is to provide a rolling mill capable of performing the above.

[0006]

In order to solve the above-mentioned problems, the present invention comprises a pair of upper and lower work rolls and a pair of upper and lower reinforcing rolls, and at least the reinforcing rolls according to changes in rolling conditions. In a rolling mill that performs rolling by moving and adjusting, the upper and lower reinforcing rolls respectively provided between the upper and lower reinforcing rolls and the vertical choke of the upper and lower reinforcing rolls and the upper and lower pressing down blocks. the and a vertical plane bearing means movable in a plane containing the material to be rolled, said plane bearing means
Is a gas carrier equipped with a gas supply means and a diaphragm.
And the upper and lower members installed near the gas bearing.
The rolling force from the rolling block is applied to the upper and lower roll chocks.
And a load supporting body for transmitting .

[0007]

[0008]

[0009]

[0010]

[0011]

In the present invention, in a four-stage rolling mill having a pair of work rolls and a pair of reinforcing rolls, a plane bearing means is provided between the roll chocks of the upper and lower reinforcing rolls and the upper and lower pressing blocks. The upper and lower reinforcing rolls can be easily moved in the axial direction, or can be easily inclined in the plane including the material to be rolled, so that the rolls are at the optimum positions .

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG .

FIG. 1 is a front view of a rolling mill according to one embodiment of the present invention. In FIG. 1, the rolling mill according to the present embodiment
The housings 1a and 1b, the down screws 2a and 2b and the down supports 2A and 2B installed in the housings 1a and 1b, and the up and down down blocks 3a and 3b installed at the tips of the down screws 2a and 2b and the down supports 2A and 2B. Upper and lower reinforcing roll metal chocks 4a and 4b, which receive a lowering force from upper and lower pressing blocks 3a and 3b, and upper and lower reinforcing roll metal chocks 4
a, 4b, upper and lower reinforcing rolls 5a, 5b, upper and lower working rolls 6a, 6b in contact with the upper and lower reinforcing rolls 5a, 5b
have. The upper and lower work rolls 6a and 6b include:
The spindles 7a and 7b for driving them are connected, and the material 8 to be rolled is rolled out from the front side to the back side. Cylinders 9a and 9b are mounted on the upper and lower reinforcing roll metal chocks 4a and 4b to move them in the axial direction. The cylinders 9a and 9b are supported by the housing 1a via brackets 10a and 10b.

In the above construction, the metal chocks 4a, 4b for the upper and lower reinforcing rolls and the vertical lowering block 3
Gas bearings 11a and 11b are respectively provided as plane bearing means between a and b, and rolling support blocks 12a and 12b are respectively provided as load supports near the gas bearings 11a and 11b. ing. FIG. 2 is a view showing in detail the configuration of the gas bearing and the rolling-down support block, and FIG.
FIG. 3 is a plan view of the gas bearing, as viewed in the direction of the arrow −III. 2 and 3 are diagrams for generally explaining upper and lower gas bearings, and letters a and b are omitted. In these figures, the gas bearing 11 is provided with a diaphragm 11A, and a gas supply port 11B is formed in the reinforcing roll metal chock 4 as a gas supply means for these diaphragms. Gas supply port 11
The compressed gas introduced from B inflates the diaphragm 11A, exits through a small hole 11C formed in the diaphragm 11A, and leaks outside from between the diaphragm 11A and the pressure-reducing block 3. At this time, a thin gas film is formed.
It is formed between 1A and the pressing block 3. Due to the gas lubrication effect of this thin gas film, the coefficient of friction becomes extremely small, about 1/1000, so that the upper and lower reinforcing rolls 5a and 5b and the upper and lower
The upper and lower reinforcing rolls 5a, 5b can be moved in the axial direction against the weight of the a, 6b. During rolling,
The supply of the compressed gas to the gas bearing 11 is stopped, and the reduction force is transmitted from the reduction block 3 to the reinforcing roll metal chock 4 via the reduction support block 12.

FIG. 4 shows a state in which the upper and lower reinforcing rolls 5a and 5b of the rolling mill according to the present embodiment have been moved to an optimum position with respect to the sheet width of the material 8 to be rolled. That is, these reinforcing rolls are moved in the axial direction such that the right end of the upper reinforcing roll 5a coincides with the right end of the material 8 to be rolled, and the left end of the lower reinforcing roll 5b coincides with the left end of the rolled material 8.

In this embodiment, the upper and lower reinforcing rolls 5
a, 5b and the upper and lower work rolls 6a, 6b can be inclined in the plane including the material 8 to be rolled. FIG. 5 is a side view showing this state. In FIG. 5, the upper reinforcement roll 5a and the upper work roll 6a are tilted in the direction of the left arrow in the figure, and the lower reinforcement roll 5b and the lower work roll 6b are inclined in the direction of the right arrow in the figure, that is, in directions opposite to each other, by means not shown. ing. The inclination angle with respect to the roll axis greatly affects the shape performance of the material 8 to be rolled, and by adjusting this, the shape of the material to be rolled is controlled. In the present embodiment, gas bearings are installed between the upper and lower reinforcing roll chocks 4a, 4b and the pressing blocks 3a, 3b to reduce the friction coefficient between the two.
The roll shaft inclination angle can be freely changed against the weights of the a and 5b and the upper and lower work rolls 6a and 6b, and the shape performance of the material 8 to be rolled is greatly improved.

FIG. 6 shows a modification of this embodiment, in which supports 13a, 13b are provided between upper and lower pressing blocks 3a, 3b and upper and lower reinforcing metal chocks 4a, 4b.
13b and flat bearing support blocks 14a and 14b are provided, and the cylinders 9a and 9b are connected to the flat bearing support blocks 14a and 14b so as to be movable in the axial direction. In the present modification, even when the reinforcing roll receives a rolling load and deflects, it is possible to prevent an excessive force from acting on the reinforcing roll bearing by the buffering action due to the slight inclination of the supports 13a and 13b. it can.

[0018]

[0019]

[0020]

[0021]

According to the present invention, the friction coefficient of contact between the upper and lower roll chocks and the upper and lower rolling blocks can be reduced by a simple plane bearing means, and the upper and lower members for controlling the shape of the material to be rolled can be reduced. The reinforcement roll can be easily moved.

[Brief description of the drawings]

FIG. 1 is a front view of a rolling mill according to an embodiment of the present invention.

FIG. 2 is a diagram for explaining in detail a configuration of a gas bearing and a pressure-lowering support block.

FIG. 3 is a view in the direction of arrows III-III in FIG. 1;
It is a top view of a gas bearing.

FIG. 4 is a view showing a state in which upper and lower reinforcing rolls of the rolling mill shown in FIG. 1 have been moved to an optimum position with respect to a sheet width of a material to be rolled.

5 is a side view showing a state where upper and lower reinforcing rolls and upper and lower work rolls of the rolling mill shown in FIG. 1 are inclined with respect to a roll axis.

FIG. 6 is a view showing a modification of the rolling mill shown in FIG .

[Explanation of symbols]

1a, 1b Housing 2A, 2B Lower support 2a, 2b Lower screw tip 3a, 3b Lower block 4a, 4b Reinforcement roll metal chock 5a, 5b Reinforcement roll 6a, 6b Work roll 8 Rolled material 11a, 11b Gas bearing 11A Diaphragm 11B gas supply port 11C eyelet 12a, 12b rolling support blocks

Continuation of the front page (56) References JP-A-57-193211 (JP, A) JP-A-4-253508 (JP, A) JP-A-4-253509 (JP, A) JP-A-4-59107 (JP) JP-A-4-55004 (JP, A) JP-A-56-131005 (JP, A) JP-A-4-90102 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) B21B 31/02 B21B 13/14 B21B 31/18

Claims (1)

(57) [Claims] A pair of upper and lower work rolls and a pair of upper and lower work rolls.
With a reinforcing roll, at least according to changes in rolling conditions
The rolling mill that performs rolling by moving the reinforcing roll
Oite, vertical pressure applied to each rolling force to the upper and lower rolls
A lower block, and a roll chock of the upper and lower reinforcing rolls.
The upper and lower blocks are respectively installed between the upper and lower pressing blocks.
The lower reinforcement roll can be moved in the plane including the material to be rolled.
A lower surface bearing unit, wherein the planar bearing unit is provided with a gas supply unit and a diaphragm, and is disposed near the gas bearing and transmits a rolling force from the vertical rolling block to the vertical roll chock. rolling machine you; and a load bearing body.