JPS60213303A - Control of distortion of roll - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION It is a well-known method for rolling metals and alloys in the form of strip by the use of rolling mills employing work rolls supported from behind by pack-ang rolls and driven by pack-ang rolls. As such, the force required to produce the desired elongation and thickness reduction of the metal is large, and this force is primarily directed in the direction of separation of the work rolls. These forces are therefore typically referred to as roll separation forces. These roll separation forces can be reduced by the action of relatively small diameter work rolls, which are the gractis used in modern O1:EF rolls. However, with relatively small diameter work mills, the work rolls are easily deflected by the high roll separation and torque forces that occur during typical rolling operations.

Torque force is the force applied to rotate the work rolls during the rolling operation, and this torque force acts approximately horizontally in a direction opposite to the direction in which the strip moves during rolling.The roll separation force is , typically acts approximately perpendicular and at right angles to the plane of the IJ during rolling.

Therefore, in a rolling mill for strip, the upper and lower work rolls of the mill are bent and deflected by roll separation forces, so that the strip being rolled has a corrugated edge. During rolling, the thickness of the central longitudinal portion of the strip is increased and defects in the form of crowns tend to occur. Specifically, during the rolling operation, the upper work roll and the lower work roll are deformed by the a-roll separation force of the strip being rolled.
As a result, the middle portions of the work rolls are bent away from each other. Various methods have been adopted to prevent or counteract the dispersion of the string during rolling caused by the action of roll separation forces on the work rolls. For details,
Attempts have been made to control the shape of the sister lip by grinding a work roll with a variable cross section so that the roll under load assumes the desired shape. This method has the obvious disadvantage of being effective only at one rolling load. Another method uses the thermal expansion that occurs as the temperature of the rolls increases during rolling to
The control method used was to vary the cooling across the work rolls. The surface of the work meal is cut to provide partial support, causing variations in the distribution of separation forces across the work rolls, and controlling the shape of the strip by acting and reacting with the split forces. 6 with 2 extra back aragrolls for
A rolling mill called a plate mill was used.

Another method uses a banok ag roll with a sleeve and introduces hydraulic pressure under the sleeve to expand the back ag roll and counteract the ale separation force.

Techniques were also used to vary the tension distribution across the stock to obtain the degree of reduction across the roll mesh.

The main object of the invention is therefore to move the 7-roll in such a way as to fully compensate for roll bending or sagging caused by roll separation forces acting on the work rolls.

A more particular object of the invention is to move the work rolls during rolling in the direction of strip movement, resulting in a horizontal component of the roll separation force and a torque force to bend the work rolls and to create a bending moment during rolling. It is to react in opposition to.

A complete understanding of these and other objects of the invention as well as the objects of the invention can be obtained from the following description and drawings.

The present invention is a method for controlling work roll deflection, the method being used with a rolling mill having a pair of substantially opposing upper and lower work rolls, the method comprising: −
The work rolls form an axle for rolling material, preferably in the form of strips or plates, by passing the material between rolls. Upper and lower 74 twine rolls are provided for driving and supporting the upper and lower work rolls from behind in a well known and conventional manner. During rolling, the method of the present invention continuously controls the deflection of the workpiece during the rolling operation.
The shape of the material being rolled is controlled by reacting to the bending moments created during rolling.

According to the method of the invention, a device is provided for applying a force for selectively moving the workpiece horizontally in the direction of movement of the strip and from that direction in a direction of crushing. Preferably, this is accomplished by pushing the roll runner forward or forward through the use of a hydraulic piston and cylinder arrangement. Therefore, in a conventional strip rolling operation, the force passing between the work rolls in a substantially horizontal plane and the force for moving the work rolls is applied to the ends or bearings of the workpiece in a substantially straight line with respect to said horizontal plane and during rolling. It is applied approximately parallel to the direction of the string O passing between the work rolls. Specifically, as discussed above, as the work roll is moved in the direction of strip travel, the torque force and the horizontal component of the roll separation force are resisted and counteract the bending moment that causes the work roll to become generally concave. This improves the uniformity of the cross section of the IJ horn being rolled.

The drawing shows an embodiment of a suitable apparatus for carrying out the method of the invention.

As seen in the drawings, the upper back-angular roll 2 is driven by a conventional rolling mill motor drive (not shown) to rotate in the direction of the arrow. Punk Agall is
The strip f5'f moving in the direction of the arrow is in driving engagement with the rolling work roll 4. The back arag roll drives the workpiece cooler 4 to rotate in the direction of the arrow. As shown in the drawings, the forces that affect the bending or deflection of the rolls are the roll separation forces and the pressure and torque forces of the deforming metal strip. These forces sweep in the direction indicated by the arrows in the drawing. The roll separation force and the metal deformation force have a horizontal component and a vertical component.

The magnitude of the horizontal component increases as the work roll is moved in the direction of strip movement. With this positioning of the workpiece shown in the drawings, the torque force counteracts the horizontal component of the roll separation force, and this horizontal component is
It is assumed that the applied support force counteracts the bending moment that deforms the work rolls created during rolling. This makes it possible to suppress defects in the shape of the strip by applying supporting force to the work roll in the approximately lk-plane direction as shown by the arrow. In the schematic diagram of the rolling mill in the figure, for simplicity of explanation,
Only the upper work roll and upper hack-and-roll of the rolling mill are shown. It will be appreciated that opposing structures and functions are repeated below the strip. The horizontal tension in the strip is included in the total force exerted on the work roll. However, since they act in the same direction and often have similar magnitudes, they can reasonably be ignored for that purpose.

[Brief explanation of drawings]

The figure is a schematic diagram of a rolling mill illustrating the implementation of the method of the invention. 2... Upper III hack and roll, 4... Upper work roll, 5... Strip! .

Claims (1)

[Claims] / A pair of rolls for rolling a material, comprising a pair of upper work rolls and a lower work roll facing each other.
an upper banokag roll and a lower panokag roll for supporting the upper work roll and the lower work roll from behind, respectively; 1. A method for use with a rolling mill having: during a rolling operation;
Continuously controlling and changing the deflection of the work roll,
effective for controlling the shape of material being rolled onto the work rolls and passing between the work rolls; the method selectively applying a force near the ends of the work rolls to selectively moving the work roll in and away from the direction of movement of the material through the material; The method according to claim 7, wherein the packed arag roll drives the work roll during rolling. 3. A method as claimed in claim 1, in which as a result of the movement of the work rolls a force is generated which counteracts the bending moment of the rolls produced during rolling. The material passes between the work rolls in a substantially horizontal plane, and the force is applied to the work meal parallel to the direction of the material passing between the work rolls and substantially in line with the horizontal plane during rolling. Claim 1 (
Method described. The method according to claim 1, wherein the backing roll drives the work roll during rolling. (b) The method according to item (h), wherein the movement of the work rolls results in a force that reacts with the bending moment of the rolls generated during rolling. a pair of substantially mutually opposed upper work rolls and a lower work roll, the rolls for rolling the string material during passage in a horizontal plane; In a method for use with a rolling mill having an upper back-ang roll and a lower pack-ang roll formed between the rolling mill and the work rolls, and for driving and supporting the upper work roll and the lower work roll from behind, respectively: The method is effective for continuously controlling and changing mJ square crawl deflection during a rolling operation to control the shape of the material being rolled by the work rolls and passing between the work coolers. the method selectively applying a force near the ends of the work rolls to select the work rolls toward and away from the direction of movement of the material between the work rolls; the force being applied to the work rolls generally parallel to the direction of the material passing between the work rolls during rolling and generally linearly relative to the horizontal plane of the material; A method for controlling deflection of a work roll, comprising: movement of the roll resulting in a force that counteracts the bending moment of said work roll developed during rolling.