The appearance of waves at the edges of copper strips, known as "lotus leaf edges", is a common problem in copper strip production, mainly due to rolling processes, material characteristics, equipment status, and subsequent processing. The following is a detailed analysis of the reasons and solutions:

1、 Cause analysis

1. Rolling process issues

Uneven distribution of pressure reduction: During rolling, the pressure reduction at the edges and middle is not consistent, resulting in inconsistent deformation at the edges.

Improper tension control: Excessive or insufficient tension can affect the flatness of the edges. Excessive tension can strain the edges, while insufficient tension cannot effectively control deformation.

Mismatched rolling speed: Both too fast and too slow speeds can affect the uniformity of deformation.

2. Material issues

Uneven thickness: There is a significant deviation in the thickness of the raw material, resulting in uneven stress on the edges during rolling.

Uneven hardness: The uneven distribution of material hardness leads to inconsistent deformation at the edges.

Organizational defects: There are defects such as pores and inclusions inside the material, which affect rolling deformation.

3. Equipment issues

Roll wear or deformation: The surface of the roll is worn or deformed, resulting in uneven stress on the edges.

Poor alignment of rolling mill: Inaccurate alignment of rolling mill installation leads to inconsistent deformation between the edges and the middle.

Insufficient rigidity of the equipment: Poor rigidity of the equipment generates vibration during rolling, affecting the quality of the edges.

4. Cooling and lubrication issues

Uneven cooling: The distribution of the cooling system is unreasonable, resulting in large temperature differences between the edges and the middle, and inconsistent deformation.

Poor lubrication: Insufficient or excessive lubrication can affect the rolling effect and cause edge waves.

5. Follow up handling of issues

Uneven annealing: Improper temperature or time control during the annealing process leads to uneven stress release at the edges.

Improper straightening: The straightening process parameters are set unreasonably, which cannot effectively eliminate edge waves.

2、 Solution measures

1. Optimize the rolling process

Adjust the compression amount: Ensure that the compression amount is evenly distributed between the edges and the middle to avoid excessive deformation of the edges.

Control tension: Set the tension reasonably according to the thickness and width of the copper strip, avoiding excessive or insufficient tension.

Adjust the rolling speed: Select the appropriate rolling speed based on the material characteristics to ensure uniform deformation.

2. Control material quality

Check raw materials: Ensure uniform thickness and hardness of raw materials, and avoid using defective materials.

Homogenization treatment: Performing homogenization annealing on raw materials to improve tissue uniformity.

3. Equipment maintenance and adjustment

Regular inspection of rollers: replace worn or deformed rollers in a timely manner to ensure the surface quality of the rollers.

Adjust the alignment of the rolling mill: Ensure accurate alignment of the rolling mill installation and avoid uneven stress on the edges.

Improve equipment rigidity: Strengthen equipment maintenance to ensure stable operation of the equipment.

4. Improve cooling and lubrication

Optimize the cooling system: Ensure even cooling and avoid excessive temperature differences between the edges and the middle.

Reasonable lubrication: Control the amount and distribution of lubricants according to the requirements of the rolling process.

5. Optimize subsequent processing

Uniform annealing: Control the annealing temperature and time to ensure uniform stress release at the edges and middle.

Adjust the straightening process: Set the straightening parameters reasonably according to the thickness and wave conditions of the copper strip.

6. Strengthen process monitoring

Online detection: Install online detection equipment to monitor the quality of copper strip edges in real-time.

Data analysis: Identify the root cause of problems through data analysis and continuously optimize process parameters.

3、 Summary

The generation of waves ("lotus leaf edges") at the edges of copper strips is the result of a comprehensive analysis and improvement of multiple factors, including rolling technology, material quality, equipment status, and subsequent processing. By optimizing process parameters, strengthening equipment maintenance, controlling material quality, and improving subsequent processing, the "ruffle edge" phenomenon can be effectively reduced or eliminated, and the quality of copper strip products can be improved.

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