The role of the backup roll

Back-up rolls are generally used in tension levelers, levelers, rolling mills and other equipment. Because the work roll is relatively long and slender, it cannot bear the radial load generated when straightening the plate shape and rolling the plate. At this time, it is necessary to arrange a support roll under the work roll or the intermediate roll to bear the radial load and act as a pair of work rolls. , The middle roller is similar to lifting. If the circumference of the backing roll is beaten large and the concentricity is not good, it will directly affect the work roll, resulting in vibration and scratches on the plate shape after stretching. Generally, the circumferential runout of the supporting roller should be controlled within 0.01mm. If the runout is too large, it is an irregular product and should not be used.

Due to the use environment of the back up roll, it must bear a large radial force, so it is the most critical mechanical part of the equipment except for the work roll. Many equipment manufacturers do not understand the structure of the back up roll, and use ball bearings and bushing parts to assemble the back up roll by themselves. This kind of back up roll is extremely non-durable, and its poor accuracy affects its use.

The back-up roller should be composed of mandrel, bearing sleeve, needle, seal, fastener, heat-resistant extreme pressure grease, and the heat treatment hardness of each part, material selection, clearance fit, assembly and debugging have specifications and requirements . In the tension leveling line below 450m/min, the service life of the support roller should be between half a year and two years (depending on the initial plate type and use environment). If the back-up roller is broken in two or three months, basically because of quality problems or improper using.

Tangshan Weilang has been committed to providing our customers with high-quality rolls. The quality of our back-up rolls is reliable and has been well received by customers at home and abroad.