JPS61182801A - Method of controlling shape of strip and multistage rolling stand for executing said method - 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 The present invention relates to rolling mill practice, and more particularly to a method and apparatus for controlling the profile or shape of metal strip in ferrous and non-ferrous metallurgy plants.

Various strip shape control methods are known that allow the metal strip during rolling to meet off-gauge thickness tolerances and surface roughness tolerances.

Control of the shape of the strip is carried out, for example, by adjusting the forces acting on the work roll or bank unroll in the vertical or horizontal plane.

A method of controlling the transverse off-gauge strip thickness during rolling is known (USSR Inventor's Certificate No. 392995, c
rt, B21B29100, Periodical Publication of Discoveries, Inventions, Industrial Designs and Trademarks 33.1973), this method involves moving the workpiece in a plane perpendicular to a plane passing through the axis of the work roll and the axis of the backup roll. It includes relatively bending the roll and the banked up roll.

This method involves forced bending of the work roll, which is bent in a vertical plane and in a horizontal plane.

The method described above is carried out by a rolling mill stand that includes a work roll, a backup roll, and a rolling force generator mounted on rolling mill bearings. Attached to the ends of the work roll are a main support and an auxiliary support, these supports
It is connected to a device, for example a hydraulic cylinder, for generating a bending force to be applied to the work roll in a horizontal plane, ie in a plane perpendicular to the plane passing through the axis of the work roll and the axis of the backup roll.

The method of the prior art and the rolling mill stand for carrying out the method are characterized in that an adjustment force influences the rolling force, so that the off-gauge longitudinal strip thickness and the rolling force generating device This results in excessive loads being applied and rapid wear thereof.

A rolling mill stand considered to be the prototype of the present invention is known (933135 on Soviet inventor's certificate 1', CI B21
B13/14, Periodical of Discoveries, Inventions, Industrial Designs and Trademarks Floor 21.1982).

This rolling mill stand comprises a work roll, a back-up roll in direct contact with one of the work rolls, a rolling force generator and a screw clamp with a clamping roller positioned in a plane passing through the axis of the back-up roll. and mechanisms.

This method of strip shape control is carried out by creating a bending force by means of a binding roller in a plane passing through the axis of a backup roll that is in direct contact with one of the work rolls.

In the above method, the bending force acts in the same plane as the resultant force of the rolling force components acting on the backup roll, increasing the contact stress between the work roll and the backup roll and reducing the durability of the roll. , there is a drawback.

This results in significantly higher loads acting on the device that produces the bending forces on the backup roll and the bearing assembly of the backup roll. This rolling mill stand is therefore more complex in construction and therefore more expensive to manufacture.

What is desired is a method of controlling the shape of the strip during rolling in a multi-roll stand and implementing said control method by applying bending forces to the banked rolls in a manner that minimizes the lateral off-gauge thickness of the strip. The purpose of the present invention is to provide a multi-roll stand for the purpose of improving the profile of the strip by perfecting the structure of the screwing mechanism used to create the bending force.

Accordingly, the present invention provides a strip shape control method consisting of applying a bending force to a back-up roll that interacts with the work roll during rolling in a multi-roll stand. A strip shape control method is provided, characterized in that a bending force is applied to at least one banked up roll that is in direct contact with a work roll in a plane passing through the axis of the uprolled roll.

Also provided herein is a multi-roll stand for carrying out the method of the invention, the multi-roll stand comprising a roll housing containing a work roll and a backup roll in direct contact with one of the work rolls, and for producing a rolling force. and a screw-tightening mechanism with a tightening roller, which according to the invention is arranged in a plane passing through the axis of the work roll so as to simultaneously act on the backup roll, This is a multi-stage roll stand characterized by making it possible to control the strip shape.

The strip 5 (FIG. 1) being rolled between work rolls 1 and 2 is subjected to a rolling force R, with a component of the rolling force R acting in a plane passing through the axis of the work roll and the axis of the backup roll. .

The invention is further illustrated by the following examples.

In FIG. 1, the bending is performed on one of the backup rolls in a plane perpendicular to the plane passing through the axis of the work roll 1 and the axis of the backup roll 3, directed towards the row of rolling strips. A method is shown for controlling the shape of the strip 5 by applying a force Q. Although the bending force Q causes the backup roll 3 to bend, it does not affect the value of the rolling force component P. When the back unroll 3 in contact with the work roll 1 bends under the action of the rolling force R, the axis of the work roll 1 is bent in the vertical plane, changing the gap between the work rolls 1 and 2, thereby Allows control over the shape of the strip.

Another control method for controlling the shape of the strip is shown in FIG.
Two methods are given.

The magnitude of the bending force is smaller than in Example 1.

111 FIG. 3 shows a best alternative for implementing the strip shape control method, in which a strip 5 being rolled between work rolls 1 and 2 is subjected to a rolling force R. The work roll 1 is in contact with two backup rolls 3 of diameter d=D/(1,5-4). Here, D is the diameter of the backup rolls 4 and 6, and is equal to the diameter of the backup roll 3 in Example 2.

In this strip shape control method, the work roll 1
A required bending force Q is applied to the two backup rolls 3 in contact with the work roll 1 in a plane perpendicular to a plane passing through the axis of the back-up roll 3 and the axis of the back-up roll 3 .

The arrangement of the rolls in the method described above makes it possible to considerably reduce the bending force Q to be applied compared to the bending force of Example 2.

The present invention provides a multistage method for implementing a strip shape control method comprising a work roll 1.2, a backup roll 3 in contact with the work roll 1, and a backup roll 4 in contact with the work roll 2. Provide a roll stand (Figure 4). Strip 5 is rolled between work rolls 1 and 2. Each backup roll 3 is
It rests on a suitable backup roll 6 suitably connected to a device 7 for generating rolling forces.

The multi-roll stand also has a screw tightening mechanism 8 with a tightening roller 9 arranged in a plane passing through the axis of the work roll 1 and the axis of the work roll 2.

The multi-roll stand includes a housing 10 that accommodates a work roll and a backup roll, a fastener roller of a screw tightening mechanism, and a rolling force generator.

The fastener roller 9 has a plane in which the plane that passes through the axis of the fastener roller 9 and the axis of the backup roll 3 that contacts the fastener roller 9 passes through the axis of the work roll l and the axis of the backup roll 3. The rolls are arranged in a multi-stage roll stand at right angles to the rolls. Fastener roller 9
The main body of the backup roll 3 is preferably shorter in length than the main body of the backup roll 3.

In many cases it is advantageous to section the binding roller and mount this section on a multi-support axis and rolling bearings which serve as supports. In such a case, the construction of the fastener rollers is similar to that of the bearing rollers in a multi-roll stand, such as a 20-roll stand.

The multi-roll stand works in the following way. Before rolling, a device 7 for generating a rolling force R and a reel (not shown) for tensioning the strip are operated. During rolling, control of the shape of the strip is effected by moving the fastening roller 9 with the screwing mechanism 8 towards the row of rolling of the strip 5.

The axis of the backup roll 3 is bent in the direction in which the bending force Q is applied, as shown in FIG. Under the action of the rolling force R, the axis of the work roll 1 is bent in a plane passing through the axes of the work rolls 1 and 2. This changes the gap between the work rolls 1 and 2 and thereby changes the shape of the strip 5.

The strip shape control method and the adoption of a multi-roll stand to implement the method eliminate the influence of the bending force Q on the rolling force R, i.e. minimize the lateral off-gauge thickness of the strip and improve the surface making it possible to improve the contour of the rolled product and therefore the quality of the rolled product.

Apart from the method of the invention, other known methods for controlling the shape and surface roughness of the strip during rolling can be supplemented. For example, a strip shape control method involves causing an axial displacement of a backup roll that is in contact with a work roll and having an oblique angle on the opposing end face.

This considerably enhances the effectiveness of the invention.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram illustrating the interaction of a backup roll and a work roll to implement the strip shape control method. FIG. 2 is a schematic diagram illustrating the interaction of a backup roll and a work roll in another strip shape control method. FIG. 3 is a schematic diagram illustrating the interaction of a backup roll and a work roll in another alternative embodiment of the strip shape control method. FIG. 4 is a schematic diagram of a roll assembly in a multi-roll stand for carrying out the strip shape control method of the present invention. 1.2... Work roll, 3.4... Backup roll, 5... Strip, 6... Backup roll, 7... Rolling force generator, 8... Screw tightening mechanism, 9... ... Fastener roller, 10... Housing of multi-stage roll stand, Q... Bending force, R... Rolling force, P
...Component of rolling force, D, d...Diameter of backup roll.

Claims (1)

[Claims] 1. In a strip shape control method comprising applying a bending force to a backup roll 3 interacting with work rolls 1, 2 during rolling in a multi-roll stand: Axis of work roll 1 and bending force Work roll 1 in a plane passing through the axis of backup roll 3 to which
Applying a bending force to at least one of the backup rolls 3 in direct contact with the strip shape control method. 2. A patent comprising a roll housing 10 accommodating a work roll 1 and a backup roll 3 in direct contact with one of the work rolls 1, a rolling force generator and a screw tightening mechanism 8 with a fastening roller 9 In a multi-roll stand for carrying out the method according to claim 1: a plane passing through the axis of the work roll 1 and the axis of the work roll 2 so that the tightening roller 9 acts simultaneously on the backup roll 3; 1. A multi-roll stand, characterized in that: arranged within the strip 5, thereby making it possible to control the shape of the strip 5.