Method for rapidly improving residual leveling liquid spots on edge of strip steel after cold rolling leveling

Abstract

The invention discloses a method for quickly improving residual leveling liquid spots on the edge of strip steel after cold rolling leveling, which comprises the following steps: equipment adjustment: the model of a newly mounted special edge blowing nozzle is Skeyi705LA, the nozzle can be flexibly adjusted by 30 degrees, the distance between the upper nozzle and the lower nozzle and the direct injection position of the strip steel is adjusted to 67mm from the original 175 mm, and according to a fixed angle and a nozzle adjustment angle, the edge blowing nozzle is adjusted to be a flat edge blowing nozzle; the blowing angle is adjusted to be 45 degrees, the covered strip steel range is 134 mm, the direct injection position is lowered, and the blowing hitting force of a nozzle is enhanced; program improvement: increasing a width compensation set value by modifying the program, and increasing a purging width compensation set value on the flat first-level picture; and the pressure is reduced to 0.40 to 0.45 MPa after the adjustment. The control method for improving the residual temper rolling liquid spots on the edge of the strip steel after cold rolling temper rolling has the characteristics of simplicity and convenience in operation, quick response, reduction of energy cost, high efficiency in improving the residual temper rolling liquid spots on the edge and the like.

Description

Technical Field

[0001] This invention relates to the field of metallurgical sheet technology, and in particular to a method for rapidly improving residual leveling liquid stains on the edges of cold-rolled strip steel. Background Technology

[0002] The cold rolling leveling process is a crucial step in strip steel production. Its core purpose is to eliminate the yield plateau of the strip steel through minute plastic deformation, correct shape deviations, and improve surface roughness and gloss, ensuring that the strip steel meets the requirements of subsequent deep processing (such as galvanizing, color coating, and stamping). During the leveling process, leveling fluid needs to be continuously sprayed into the rolling area to reduce the friction coefficient between the strip steel and the rolls, reduce roll wear, cool the rolled piece, and clean iron filings and impurities from the strip steel surface. The proper use of leveling fluid is an important prerequisite for ensuring the stable progress of the leveling process and the surface quality of the strip steel. However, the problem of residual leveling fluid stains on the edges of the strip steel has long existed in actual production, becoming a prominent bottleneck restricting the improvement of the surface quality of high-end strip steel.

[0003] The leveling fluid stains on the edges of the strip are mainly due to the "edge effect," which causes a significant difference in the spreading and adhesion of the leveling fluid at the edges compared to the center. This results in oil stains, water stains, or mixed residues after subsequent drying and coiling, creating color differences. This is especially problematic in the production of deep-drawing products (e.g., DC06-QRCW / ST13 / ST14). Because the strip material is relatively soft compared to other materials, the actual rolling force is relatively low (900-1100KN). While this meets the elongation requirements, the low rolling force in actual production means the roll gaps fail to completely seal the leveling fluid at the edges, resulting in continuous leveling fluid stains (e.g., 20-150mm from the edges) that extend beyond the strip's edges. Figure 1 If the remaining leveling liquid stains cannot be removed by subsequent edge trimming, and due to the limitations of the industry's edge-smoothing and blowing equipment, conventional cleaning methods are insufficient to completely remove them, the residual leveling liquid stains will affect the customer's subsequent use when producing high-grade surface materials such as FC and FD (affecting the coating of the sheet material, resulting in obvious color difference marks after coating), failing to meet the grading standards, and being downgraded, thus affecting efficiency.

[0004] Currently, the industry's methods for controlling leveling fluid residue have significant limitations: First, conventional control focuses on optimizing the overall purging system, such as adjusting nozzle pressure and angle or increasing the number of purging groups, but lacks targeted design for the "edge effect," making it difficult to accurately remove residue from the edges. Second, some companies reduce residue by lowering the leveling fluid concentration or spray volume, but sacrifice the lubrication and cooling properties of the leveling fluid, leading to new problems such as scratches on the strip surface and increased roll wear. In addition, a few technologies attempt to control residue by adjusting coiling tension, but the effect is unstable and cannot adapt to the production needs of strips of different specifications.

[0005] Therefore, to address the industry pain point of residual leveling fluid stains on the edges of cold-rolled strips, there is an urgent need to develop a targeted, precise, and stable method. By synergistically optimizing key aspects such as leveling fluid characteristics, spraying parameters, and edge purging equipment, effective control of residual stains on the edges can be achieved, thereby improving the surface quality of the strip, reducing the defect rate in subsequent processing, and meeting the production needs of high-end strip products. This method has significant engineering application value. Summary of the Invention

[0006] The purpose of this invention is to provide a method for rapidly improving residual leveling liquid stains on the edges of cold-rolled strips. This method for improving the control of residual leveling liquid stains on the edges of cold-rolled strips has the characteristics of simple operation, rapid response, reduced energy costs, and efficient improvement of residual leveling liquid stains on the edges, meeting the quality requirements of FC and FD products. At the same time, it can set different purging parameters for different steel grades and specifications to quickly improve the defect of residual leveling liquid stains on the edges after leveling and rolling.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] This invention provides a method for rapidly improving residual leveling liquid stains on the edges of cold-rolled strips, comprising:

[0009] Equipment adjustment:

[0010] The newly installed dedicated edge blowing nozzle model is Skeyi705LA. The nozzle can be flexibly adjusted by 30°, and the distance between the upper and lower nozzles and the direct position of the strip is adjusted from 175mm to 67mm. According to the fixed angle and the nozzle adjustment angle, the blowing angle is adjusted to 45°, and the coverage area of ​​the strip is 134mm. The direct position is lowered and the blowing force of the nozzle is enhanced.

[0011] Program improvements:

[0012] The edge blowing of the leveling machine is matched with a width compensation adjustment, which allows for compensation adjustment of strips of different widths, avoiding air waste and achieving precise blowing. According to the layout of the edge blowing equipment, since the edge blowing is controlled by a screw, a width compensation setting value is added by modifying the program, and a blowing width compensation setting value is added to the first-level leveling screen. By adjusting the blowing angle and the coverage area, width compensation and pressure values ​​are adjusted for strips of different widths, thereby achieving a cleaning effect while reducing pressure. After adjustment, the pressure is reduced by 0.40-0.45MPa, saving air.

[0013] Furthermore, the calculation method for the purging width is as follows: Actual strip width - compensation setting value = edge purging opening, that is, compensation setting value / 2 equals the edge purging distance from the edge of the strip.

[0014] Furthermore, the pressure was adjusted to 0.45 MPa.

[0015] Furthermore, the width compensation position has been modified to 40-150mm.

[0016] Furthermore, the width compensation position has been modified to 40-120mm.

[0017] Furthermore, this method rapidly improves the leveling liquid residue on the edges after leveling rolling, while also reducing energy consumption and lowering costs.

[0018] The present invention also provides the application of the method for rapidly improving residual leveling liquid stains on the edge of cold-rolled strips to rapidly improve residual leveling liquid stains on the edge after leveling rolling.

[0019] Compared with the prior art, the beneficial technical effects of the present invention are as follows:

[0020] This invention features simple operation, rapid response, reduced energy costs, and efficient improvement of residual leveling liquid stains on the edges, meeting the quality requirements of FC and FD products. It can also set different purging parameters for different steel grades and specifications, quickly improving residual leveling liquid stains on the edges after leveling and rolling, while reducing energy consumption and lowering costs. Attached Figure Description

[0021] The present invention will be further described below with reference to the accompanying drawings.

[0022] Figure 1 The stain is a smoothing liquid mark on the edge (55mm from the edge);

[0023] Figure 2 Designed for the original edge purging device;

[0024] Figure 3 Designed for a new edge purging device;

[0025] Figure 4 For the edge-sweeping device;

[0026] Figure 5 The left image shows the image before modification, and the right image shows the image after modification.

[0027] Figure 6 This is a comparison between the original nozzle and the new nozzle. Detailed Implementation

[0028] The present invention will be described in detail below through specific embodiments. These embodiments are only intended to help understand the present invention and do not limit the scope of the present invention.

[0029] Example

[0030] Based on the technical requirements of the adjusted and improved edge purging equipment described above, and through on-site testing and data exploration, purging parameters for different steel grades and specifications were collected and compiled, as shown in Table 1:

[0031] Table 1. Sweeping parameters for the flattened edge in embodiments of the present invention.

[0032]

[0033]

[0034] Before adjustment: The width compensation position was fixed, the edge cleaning distance from the strip edge was 200 / 2 = 100mm, and the cleaning pressure was 0.50Mpa. The original design method failed to effectively eliminate edge defects. Controlling edge defects was difficult for deep-drawing mild steel (steel grades with relatively low actual rolling force and surface grades FC / FD). Due to the fixed position, the pressure had to be frequently increased for removal, resulting in poor control.

[0035] Adjusted effect: After program improvement and equipment adjustment, the program adds edge purging width position compensation adjustment, which adjusts the nozzle distance from the strip direct shot position. The purging position and pressure can be set according to different strip widths and defect distribution positions, improving the nozzle purging impact force and achieving a precise purging effect. At the same time, it can reduce purging pressure and save air source.

[0036] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for rapidly improving residual leveling fluid stains on the edges of cold-rolled strips, characterized in that: include: Equipment adjustment: The newly installed dedicated side blowing nozzle model is Skeyi 705LA. The nozzle can be flexibly adjusted by 30°, and the distance between the upper and lower nozzles and the direct position of the strip is adjusted from 175mm to 67mm. According to the fixed angle and the nozzle adjustment angle, the blowing angle is adjusted to 45°, and the coverage area of ​​the strip is 134mm. The direct position is lowered and the blowing force of the nozzle is enhanced. Program improvements: The edge blowing of the leveling machine is matched with a width compensation adjustment, which allows for compensation adjustment of strips of different widths, avoiding air waste and achieving precise blowing. According to the layout of the edge blowing equipment, since the edge blowing is controlled by a screw, a width compensation setting value is added by modifying the program, and a blowing width compensation setting value is added to the first-level leveling screen. By adjusting the blowing angle and the coverage area, width compensation and pressure values ​​are adjusted for strips of different widths, thereby achieving a cleaning effect while reducing the pressure. After adjustment, the pressure is reduced to 0.40-0.45MPa, saving air.

2. The method for rapidly improving residual leveling fluid stains on the edges of cold-rolled strips according to claim 1, characterized in that: The calculation method for the purging width is: actual strip width - compensation setting value = edge purging opening, that is, compensation setting value / 2 equals the edge purging distance from the edge of the strip.

3. The method for rapidly improving residual leveling fluid stains on the edges of cold-rolled strips according to claim 1, characterized in that: The pressure was reduced to 0.45 MPa after adjustment.

4. The method for rapidly improving residual leveling fluid stains on the edges of cold-rolled strips according to claim 1, characterized in that: The width compensation position has been modified to 40-150mm.

5. The method for rapidly improving residual leveling fluid stains on the edges of cold-rolled strips according to claim 1, characterized in that: The width compensation position has been modified to 40-120mm.

6. The method for rapidly improving residual leveling fluid stains on the edges of cold-rolled strips according to claim 1, characterized in that: This method can quickly improve the residual leveling liquid stains on the edges after leveling rolling, while also reducing energy consumption and lowering costs.

7. The method for rapidly improving residual leveling liquid stains on the edge of cold-rolled strip as described in claim 1 is applied to rapidly improving residual leveling liquid stains on the edge after leveling rolling.

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