Control method for inhibiting flanges after flattening and coiling of cold-rolled thin strip steel

Abstract

The invention relates to the technical field of metallurgical machinery, automation and rolling, in particular to a control method for inhibiting flanges after flattening and coiling of cold-rolled thin strip steel, which specifically comprises the following steps: in a flattening and rolling stage, setting flattening and rolling force based on the thickness specification of the strip steel and optimizing a roller curve of a flattening working roller, and in a coiling stage, setting coiling tension based on the thickness specification of the strip steel. The method has the advantages that the flat coiling rib defect of the thin strip steel is eliminated through cooperative control of the flat process and the coiling process, the defect can be eliminated without other auxiliary equipment and special treatment, the production process is simplified, and the production cost is reduced; the thin-specification strip steel obtained through the leveling process and the coiling process is free of obvious rib defects on the surface and high in production efficiency, and the production requirements of downstream enterprises are met. The roller curve of a leveling working roller is reduced, deformation of the middle of strip steel is reduced, and middle flanges are restrained; in the coiling stage, coiling tension is set based on the thickness specification of the strip steel to restrain middle deformation of the strip steel.

Description

Technical Field

[0001] The invention relates to the fields of metallurgical machinery, automation and rolling technology, and in particular to a control method for suppressing convex edges after flat coiling of cold-rolled thin strip steel. Background Art

[0002] Modern steel cold rolling enterprises generally use continuous annealing units to carry out heat treatment of cold-rolled strip. In order to ensure the strip shape and eliminate the yield platform, the strip after continuous annealing needs to be flat-rolled and then coiled.

[0003] When the leveling machine produces materials with a thickness between 0.6mm and 0.8mm on a daily basis, ridge defects frequently occur in the middle of the strip during the coiling process. The defects can only be dealt with by stopping the machine and cutting off the waste, and then increasing the speed of production after the strip surface returns to normal, which seriously affects production efficiency and quality. Summary of the invention

[0004] The purpose of the present invention is to provide a control method for suppressing ridges after flat coiling of cold-rolled thin strip steel, solve the problem of ridge defects generated in the middle of thin-gauge strip steel during coiling, and realize continuous and stable production of the unit.

[0005] To achieve the above object, the present invention is implemented through the following technical solutions:

[0006] A control method for suppressing convex edges after flat coiling of cold-rolled thin strip steel, specifically comprising:

[0007] S1. During the temper rolling stage, the temper rolling force is set based on the strip thickness specification;

[0008] S2, optimization of the roll curve of the leveling work roll;

[0009] S3. During the coiling stage, the coiling tension is set based on the strip thickness specification.

[0010] In S1, the temper rolling force is calculated as follows:

[0011] F 1 =F 0 +0.7h①

[0012] In formula ①, F 1 Represents the optimized temper rolling force, in MN; F 0 It represents the flat rolling force used for conventional strip steel, in MN; h represents the strip steel thickness, in mm.

[0013] In S2, the smooth working roll curve is reduced to ≤3μm, and the smooth working roll curve adopts a sine 72° curve. The curve range is 50mm from the operating side edge to 50mm from the transmission side edge of the working roll body.

[0014] In S3, the winding tension is calculated as follows:

[0015] K 1 =K 0 +5.5h②

[0016] In formula ②, K 1 Indicates the optimized winding tension, in KN; K 0 Indicates the coiling tension used for conventional strip steel, in KN.

[0017] The thickness range of conventional strip steel is 0.8 to 1.2 mm.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention realizes the elimination of ridge defects of flat coiling of thin-gauge strip steel by coordinated control of flattening process and coiling process, and the defects can be eliminated without other auxiliary equipment and special treatment, thus simplifying the production process and reducing the production cost;

[0020] 2. The thin-gauge steel strip obtained by the flattening process and coiling process of the present invention has no obvious ridge defects on the surface and has high production efficiency, which meets the production needs of downstream enterprises;

[0021] 3. The solution of setting the tempering rolling force based on the strip thickness specification is adopted. During the tempering rolling stage, the thicker the strip is, the greater the rolling force required to achieve sufficient plastic deformation to improve the flatness;

[0022] 4. Lowering the curve of the flat work roll can reduce the deformation of the middle part of the strip and inhibit the formation of ridges in the middle;

[0023] 5. During the coiling stage, the coiling tension is set based on the strip thickness specification to suppress deformation in the middle of the strip. DETAILED DESCRIPTION

[0024] The present invention is described in detail below, but it should be noted that the implementation of the present invention is not limited to the following embodiments.

[0025] According to the characteristics of thin-gauge strip steel, that is, the thickness of thin-gauge strip steel is 0.6-0.8mm and the width is 800-1100mm, the process parameters are optimized starting from the leveling process, and the subsequent and coiling processes are coordinated and controlled.

[0026] A control method for suppressing convex edges after flat coiling of cold-rolled thin strip steel, specifically comprising:

[0027] S1. In the temper rolling stage, the temper rolling force is set based on the strip thickness specification. The temper rolling force calculation formula is as follows:

[0028] F1 =F 0 +0.7h①

[0029] In formula ①, F 1 Represents the optimized temper rolling force, in MN; F 0 It indicates the flat rolling force used for strip steel with a thickness of 0.8mm-1.2mm, in MN; h indicates the thickness of the strip steel, in mm.

[0030] S2, Optimization of the roll curve of the leveling work roll

[0031] The flat working roll curve is reduced to ≤3μm. The flat working roll curve adopts a sine 72° curve. The curve range is 50mm from the operating side edge to 50mm from the transmission side edge of the working roll body.

[0032] S3. In the coiling stage, the coiling tension is set based on the strip thickness specification. The coiling tension is calculated as follows:

[0033] K 1 =K 0 +5.5h②

[0034] In formula ②, K 1 Indicates the optimized winding tension, in KN; K 0 Indicates the coiling tension used for strip steel with a thickness of 0.8mm-1.2mm, in KN.

[0035] The following examples are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes, but the protection scope of the present invention is not limited to the following examples. The methods used in the following examples are conventional methods unless otherwise specified.

[0036] Example 1

[0037] The specifications of thin cold-rolled strip steel are 0.6-0.8mm thick and 800-1100mm wide;

[0038] The embodiment gives the parameters of strip thickness, temper rolling force, work roll curve, coiling tension, and middle ridge, see Table 1.

[0039] Table 1 Flattening and coiling process parameters:

[0040]

[0041] It can be seen from the above embodiments that by adopting the control process of the present invention, the surface quality of the produced steel strip is good, there is no central ridge defect, and the production needs of the enterprise are met.

[0042] The present invention achieves the elimination of ridge defects in flattening and coiling of thin-gauge strip steel through coordinated control of the flattening process and the coiling process. The defect elimination can be completed without other auxiliary equipment and special treatment, thereby simplifying the production process and reducing production costs. The thin-gauge strip steel obtained by the flattening process and the coiling process of the present invention has no obvious ridge defects on the surface and has high production efficiency, thus meeting the production needs of downstream enterprises. A solution for setting the flattening rolling force based on the strip thickness specification is adopted. During the flattening rolling stage, the greater the thickness of the strip, the greater the rolling force required to achieve sufficient plastic deformation to improve the flatness. Reducing the roller curve of the flattening working roll can reduce the deformation of the middle part of the strip and inhibit the generation of ridges in the middle. During the coiling stage, the coiling tension is set based on the strip thickness specification to inhibit the deformation of the middle part of the strip.

Claims

1. A control method for suppressing the ridge after flat coiling of cold-rolled thin strip steel, characterized in that: Specifically include: S1. During the temper rolling stage, the temper rolling force is set based on the strip thickness specification; S2, optimization of the roll curve of the leveling work roll; S3. During the coiling stage, the coiling tension is set based on the strip thickness specification.

2. A control method for suppressing ridges after flat coiling of cold-rolled thin strip steel according to claim 1, characterized in that: In S1, the temper rolling force is calculated as follows: F1=F0+0.7h① In formula ①, F1 represents the optimized flat rolling force, in MN; F0 represents the flat rolling force used for conventional specification strip steel, in MN; h represents the strip steel thickness, in mm.

3. The control method for suppressing the ridge after flat coiling of cold-rolled thin strip steel according to claim 1, characterized in that: In S2, the smooth working roll curve is reduced to ≤3μm, and the smooth working roll curve adopts a sine 72° curve. The curve range is 50mm from the operating side edge to 50mm from the transmission side edge of the working roll body.

4. A control method for suppressing ridges after flat coiling of cold-rolled thin strip steel according to claim 1, characterized in that: In S3, the winding tension is calculated as follows: K1=K0+5.5h② In formula ②, K1 represents the optimized coiling tension, in KN; K0 represents the coiling tension used for conventional specification strip steel, in KN.

5. The control method for suppressing the ridge after flat coiling of cold-rolled thin strip steel according to claim 1, characterized in that: The thickness of the conventional steel strip ranges from 0.8 to 1.2 mm.

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