How to avoid bearing burnout in short stress rolling mill?
How to avoid bearing burnout in short-stress rolling mills? Here we only discuss seal failure. The biggest consequence after seal failure is the leakage of bearing lubricating oil, pollutants enter the bearing, aggravate bearing wear, and then the bearing "burns out". So what are the reasons for the failure of the seal? The first is the selection of the seal. Since the rolling mill is often disassembled and assembled, the seal with a secondary lip must be used for the seal, and the direction cannot be reversed to ensure that the lubricating oil or lubricating grease is well sealed.
Secondly, when assembling the short-stress rolling mill, the height of the roll should be adjusted or observed before assembly, so as not to damage the seal; the third is to replace it regularly, and replace it at any time if it is damaged. If the seal is used for too long, the gap between the sealing lip and the moving labyrinth will form a gap fit. When using oil-air lubrication, the oil will leak (the grease is relatively better), and at the same time, water, iron oxide scale and other pollutants will enter the bearing and damage the bearing, shortening the life of the bearing or " Burnout".
Tie rod and box assembly: Tie rod and copper nut are the main working parts of the rolling mill. The condition of this part of the equipment will directly affect the product quality and the control of the production process. The rolling mill drives the upper and lower boxes to move symmetrically through the rotation of the copper nut installed on the tie rod, thereby realizing the symmetrical adjustment of the rolling roll gap.
The advantage of this adjustment method is that the rolling line is stable, which can avoid rolling and quality accidents caused by the misalignment of the rolling line and the center line of the pass, and greatly reduces the dependence on the technical level of the rolling steel adjuster. The process is simplified. So as to achieve the purpose of reducing rolling accidents and improving product precision. The copper nut installed on the tie rod, the pressure ring, the ring and the gap between the entire box and the elastic deformation of the tie rod when the force is applied are the main reasons for the "bounce" of the rolling mill, and the elimination of "bounce" is the main measure to improve the rolling stability. , It is also an important means to improve the utilization rate of rolling groove and product quality.
Elimination of "bouncing" is mostly achieved through disc springs, hydraulic pressure, and damping bodies. "Bouncing" is an important indicator for evaluating the performance of short-stress rolling mills. The size and control level of bounce will directly reflect whether the rolling mill can meet the quality requirements of high-end products.