Online Repair and Life Extension Techniques for Rollers of Second - hand Welded Pipe Mill Unit

The roller is the key component most easily worn in the second-hand welded pipe unit, which directly affects the surface quality and dimensional accuracy of the pipe. Frequent replacement of new rolls is costly, but mastering online repair and life extension techniques can restore roll performance without dismantling the machine and significantly extend the continuous operation cycle of the unit.

In daily production, common damage to rolls includes surface roughening, local dents and edge chipping. For slight roughening, online grinding can be used, using fine-grained oilstones and low-speed rotation for manual grinding. The rough layer on the surface can be removed before continued use. Pay attention to maintaining even pressure when sanding to avoid creating new high spots. If it is found that a certain roll has a local dent but does not affect the overall forming, it can be adjusted to a non-load-bearing position, or the roll reduction can be fine-tuned to compensate.

The core of online repair is to regularly check the radial runout and axial movement of the roll. When the runout increases significantly, the bearing clearance should be checked first, and appropriate pre-tightening or replacement of worn bearings can often restore most of the accuracy. When the hardness of the roll surface decreases, portable laser cladding equipment can be used for local repair welding and then polished smooth. This repair method has little thermal impact, controllable deformation, and can extend the life of the roll by more than twice.

In addition to repairs, daily maintenance is equally important. After each shift, clean the remaining scale and coolant on the roller surface to prevent rust. Regularly add high-temperature resistant grease to the roller bearings to avoid dry grinding. Reasonably distribute the reduction amount of different stands to avoid premature roll failure caused by overloading a certain pass. In addition, establishing a roll usage file to record the cumulative production time and repair times of each pair of rolls will help scientifically arrange rotation.Through online repair and meticulous maintenance, the life of the rolls of second-hand welded pipe units can be significantly extended, the cost of purchasing spare parts is significantly reduced, and the downtime of the production line is also reduced accordingly. For small and medium-sized pipe manufacturing enterprises, this is an effective way to improve equipment utilization and reduce operating costs.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com.