A method for increasing tension based on rolling conditions

Abstract

This invention relates to a control method for increasing tension based on rolling conditions. The control method includes the following steps: S1, setting the standard tension values ​​for the inlet uncoiler and the outlet coiler according to process requirements; S2, after the rolling roll gap is closed, when the rolling force reaches 2000KN, the operator manually starts to establish the tension values ​​for the uncoiler and coiler; S3, stopping when the established tension value reaches 60% of the tension value set in step S1; S4, starting the rolling mill, during the acceleration phase from 0 to 30m / min, the rolling mill speed and inlet / outlet tension values ​​are changing, and it is necessary to wait until the rolling mill speed and tension values ​​are stable; S5, after the rolling mill speed and tension values ​​are stable, the operator gradually increases the tension of the uncoiler and coiler to the tension value set in S1 in increments of 3KN / s. This method can fully tighten the strip, avoid strip slippage during startup, prevent forward slippage during startup, and avoid startup defects.

Description

Technical Field

[0001] This invention relates to a method for controlling tension based on rolling conditions. Background Technology

[0002] To maintain stable rolling, a certain amount of tension must be added to the inlet and outlet during production (to tighten and prevent deviation). Considering factors such as uncoiling sticking, coiling sticking, and surface color, the inlet and outlet tensions will have certain deviations depending on the product condition, and some products have large deviations. These deviations ensure rolling stability during the steady speed stage. However, a large deviation in front and back tension can easily cause the strip to slip on the work rolls at the moment of starting the roll, resulting in starting mark defects. These defects directly damage the rolls and cause periodic transverse defects in the strip. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a method for controlling the increase of tension according to the rolling state.

[0004] To solve the above-mentioned technical problems, the technical solution of the present invention is: a control method for increasing tension according to the rolling state, the control method comprising the following steps:

[0005] S1. Set the standard tension values ​​for the inlet uncoiler and the outlet coiler according to the process requirements;

[0006] S2. After the rolling roll gap is pressed together, when the rolling force reaches 2000KN, the operator begins to manually establish the tension values ​​of the uncoiler and coiler.

[0007] S3. Stop when the established tension value reaches 60% of the tension value set in step S1;

[0008] S4. When starting the rolling mill, the rolling mill speed and the inlet and outlet tension values ​​are changing during the speed increase phase from 0 to 30 m / min. It is necessary to wait until the rolling mill speed and tension values ​​are stable.

[0009] S5. Once the mill speed and tension values ​​are stable, the operator gradually increases the tension of the uncoiler and coiler to the tension value set in S1, following a gradient of 3KN / s.

[0010] Preferably, in step S1, the tension range of the uncoiler is 3.5 to 61 kN for high speed and 7.7 to 134 kN for low speed; the tension range of the coiler is 3.2 to 52 kN for high speed and 7 to 115 kN for low speed.

[0011] Preferably, in step S2, the tensioning direction of the strip by the uncoiler is from the roll gap to the uncoiler, and the tensioning direction of the strip by the coiler is from the roll gap to the coiler.

[0012] Preferably, a front guide roller group, a rolling roller group, and a rear guide roller group are sequentially arranged between the uncoiler and the coiler along the conveying direction of the strip.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. Stop when the established tension value reaches 60% of the tension value set in step S1. This can fully tighten the strip, avoid the strip from swinging off course when starting the machine, avoid forward slippage at the moment of starting the machine, and avoid starting pattern defects.

[0015] 2. If the tension is increased too slowly, it will affect efficiency; if it is increased too quickly, it will easily pull the strip and cause it to break. Therefore, after the mill speed and tension are stable, the operator should gradually increase the tension of the uncoiler and coiler to the tension value set in S1 in increments of 3 KN / s to ensure high efficiency and stability.

[0016] 3. In steps S4-S5, after the rolling mill starts and the work roll rotates, the tension can begin to increase. Since the work roll has already started to rotate, there is no longer a speed difference between the strip and the work roll at the moment of starting, so there is no problem of the strip slipping on the work roll. The tension can be increased to ensure the required tension value of the strip.

[0017] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a diagram of the defects caused by the starting marks on the strip.

[0019] Figure 2 This is a simplified diagram illustrating the operation of an embodiment of the present invention. Detailed Implementation

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] It should be noted that the following detailed descriptions are exemplary and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] like Figures 1-2 As shown, this embodiment provides a control method for increasing tension according to the rolling state. The control method includes the following steps:

[0024] S1. Set the standard tension values ​​for the inlet uncoiler and the outlet coiler according to the process requirements;

[0025] S2. After the rolling roll gap is pressed together, when the rolling force reaches 2000KN, the operator begins to manually establish the tension values ​​of the uncoiler and coiler.

[0026] S3. Stop when the established tension value reaches 60% of the tension value set in step S1 (too little tension will not be able to fully tighten the strip and will cause the strip to deviate when starting the machine).

[0027] S4. When the mill starts up, during the acceleration phase from 0 to 30 m / min (approximately 1.5 seconds), the mill speed and inlet / outlet tension values ​​are changing. It is necessary to wait another 3 seconds until the mill speed and tension values ​​stabilize.

[0028] S5. Once the mill speed and tension values ​​are stable, the operator gradually increases the tension of the uncoiler and coiler to the tension value set in S1 in increments of 3 kN / s (increasing too slowly will affect efficiency, while increasing too quickly may cause the strip to break).

[0029] In this embodiment of the invention, in step S1, the tension range of the uncoiler is 3.5 to 61 KN for high speed and 7.7 to 134 KN for low speed; the tension range of the coiler is 3.2 to 52 KN for high speed and 7 to 115 KN for low speed.

[0030] In this embodiment of the invention, in step S2, the tensioning direction of the strip by the uncoiler is from the roll gap to the uncoiler, and the tensioning direction of the strip by the coiler is from the roll gap to the coiler.

[0031] In this embodiment of the invention, a front guide roller group 3, a rolling roller group 4, and a rear guide roller group 5 are sequentially arranged between the uncoiler 1 and the coiler 2 along the conveying direction of the strip 6.

[0032] In this embodiment of the invention, slippage between the work roll and the strip is unavoidable. The purpose of low tension is to prevent forward slippage at the moment of start-up, which would cause the strip to be pulled towards the exit momentarily, resulting in misalignment between the strip and the work roll and damage to the work roll. In this invention, after the operator sets the tension, only 60% of the set tension value is applied (too little tension will prevent the strip from being tightened, easily causing deviation and leakage; too much tension will cause pulling and start-up defects). After 5 seconds of start-up (after the start-up rolling work roll rotates), the tension is gradually increased at a rate of 3 kN per second (too slow an increase will affect efficiency; too fast an increase will easily cause pulling), until the set tension is reached and the increase stops, avoiding strip breakage caused by rapid tension increase.

[0033] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for controlling tension increase based on rolling state, characterized in that: The control method includes the following steps: S1. Set the standard tension values ​​for the inlet uncoiler and the outlet coiler according to the process requirements; S2. After the rolling roll gap is pressed together, when the rolling force reaches 2000KN, the operator begins to manually establish the tension values ​​of the uncoiler and coiler. S3. Stop when the established tension value reaches 60% of the tension value set in step S1; S4. When starting the rolling mill, the rolling mill speed and the inlet and outlet tension values ​​are changing during the speed increase phase from 0 to 30 m / min. It is necessary to wait until the rolling mill speed and tension values ​​are stable. S5. Once the mill speed and tension values ​​are stable, the operator gradually increases the tension of the uncoiler and coiler to the tension value set in S1, in increments of 3 KN / s. In step S1, the tension range of the uncoiler is 3.5 to 61 kN at high speed and 7.7 to 134 kN at low speed; the tension range of the coiler is 3.2 to 52 kN at high speed and 7 to 115 kN at low speed. In step S2, the tensioning direction of the strip by the uncoiler is from the rolling roll gap to the uncoiler, and the tensioning direction of the strip by the coiler is from the rolling roll gap to the coiler; a front guide roller group, a rolling roll group, and a rear guide roller group are sequentially arranged between the uncoiler and the coiler along the conveying direction of the strip.

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