How to avoid cracks or damage to pipes after rolling and bending?

To avoid cracks or damage to the pipeline after rolling and bending, the following measures can be taken:
1. Material selection and quality control: Firstly, high-quality pipes that meet the standards should be selected, and their mechanical properties, strength, toughness, and other parameters should be ensured to meet the requirements of rolling and bending processing. Strictly control the quality of materials and avoid using defective or unqualified pipes.
2. * * Reasonable rolling and bending process design * *: When designing the rolling and bending process, reasonable adjustments should be made based on the material, diameter, wall thickness and other characteristics of the pipe. Choose the appropriate rolling radius and angle to avoid stress concentration and crack formation caused by excessive or insufficient bending.
3. Accurate positioning and fixation: During the rolling process, it is necessary to ensure the accurate and stable positioning of the pipeline. Use appropriate positioning devices and fixtures to ensure that the pipeline does not move or deviate during the rolling process. This helps to reduce the uneven stress distribution and crack risk caused by inaccurate positioning.
4. * * Control rolling speed and force * *: Excessive rolling speed or force may cause cracks or damage to the pipeline. Therefore, during the rolling process, the speed of the rolling machine and the force applied to the pipeline should be controlled to ensure that they match the characteristics and process requirements of the pipe.
5. * * Heat treatment and cooling process optimization * *: Cracks may occur in pipes after rolling due to stress concentration and temperature changes. Therefore, after the rolling is completed, the pipeline can be subjected to appropriate heat treatment to eliminate or reduce stress concentration. Meanwhile, during the cooling process, the cooling speed should be controlled to avoid cracks in the pipeline caused by too fast or too slow cooling.
6. Regular Inspection and Maintenance: Regularly inspect and maintain the rolling and bending equipment and pipelines to ensure their normal operation and the integrity of the pipelines. Timely detection and handling of equipment failures and pipeline damage can effectively prevent cracks or damage to pipelines after rolling and bending.
In summary, measures such as reasonable material selection, process design, positioning and fixation, speed and force control, and optimization of heat treatment and cooling processes can effectively prevent cracks or damage to pipelines after rolling and bending. Meanwhile, regular inspection and maintenance are also important measures to ensure the quality of pipelines.