Rolling mill is the equipment required for rolling metal materials such as steel, aluminum, copper, and stainless steel. The quality and wear degree of the rolling mill directly affect the quality and production efficiency of the metal coil. With the continuous development of rolling mill production technology, new changes have also occurred in the rolling mill. New materials, new processes, and new forms of rolling mills continue to emerge, providing better equipment for rolling mill production and highlighting the importance of the performance and maintenance of rolling mill equipment.
一、 Repair and maintenance process for roll welding
1. Welding: Welding is generally carried out using methods such as MIG/MAG welding, TIG welding, or PLASMA welding. During the welding process, it is necessary to maintain the roundness or roundness error of the rolling mill within the specified range of the rolling mill. The quality of welding directly determines the service life of the rolling mill.
2. Grinding: After running for a period of time, the su***ce wear of the rolling mill will cause changes in the blank and hardness of the rolling su***ce. The su***ce of the rolling mill is also susceptible to su***ce defects such as liquid crystal rupture and cracking, leading to a decrease in the service life of the rolling mill. Therefore, regular grinding processing is required.
3. Quality inspection: Rollers that have undergone welding and grinding need to undergo quality inspection to check the su***ce quality of the rollers. The su***ce should be free of damage, cracks, pitting, and porosity, and the hardness should be qualified.
4. Grinding: Rolls are inevitably prone to problems such as hard damage, looseness, and cracks during production, and require grinding. During the grinding process, it is necessary to maintain the shape, size, and roundness of the rolls to prevent the expansion of roll errors.
5. Maintenance: Rolls often suffer from problems such as roll eating, track deviation, improper pressure adjustment, oil seal wear, and bearing failure during production. Maintenance is necessary to promptly identify and troubleshoot issues, reduce unnecessary downtime, and ensure **ooth production.
二、 Precautions for Maintenance and Repair of Roll Welding
1. Keep clean: During the use of the rolling mill, it should be kept clean, and there should be no scrap iron, hard slag, or mixed substances on the su***ce of the rolling mill. After the use of the rolling mill, the rolling su***ce should be cleaned thoroughly, and then washed with cleaning agents, wiping agents, etc. to prevent long-term storage from causing rusting, corrosion, and other issues on the su***ce of the rolling mill.
2. Add lubricating oil: Lubricating oil should be added to the rolling mill before daily use to prevent friction between the rolling mill su***ce and the rolling mill bed, accelerate wear, and increase the frequency of rolling mill maintenance. At the same time, lubricating oil should be regularly added to the oil seal and bearing parts to ensure the normal operation of the bearings.
3. Pay attention to the quality of welding: The quality of welding will directly affect the service life of the rolling mill. During the welding process, it is necessary to strictly control parameters such as wedge angle, base metal temperature, welding current, flow rate and pressure of protective gas to achieve the welding effect.
4. Regular maintenance: Roller maintenance is an important measure to extend the service life of rollers and prevent roller failures. Rolling mill maintenance is generally divided into daily maintenance and regular repairs. Daily maintenance includes cleaning, lubricating, and inspecting the rolling mill rolls, while regular maintenance includes grinding, repairing, and quality inspection of the rolling mill rolls.
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