Maintenance Measures for Rolling Mill in Daily Steel Rolling Process

In the daily steel rolling industry, it is crucial to emphasize the routine maintenance of the rolling mill for better stability and work efficiency. This practice can effectively extend the lifespan of the rolling mill and reduce production and maintenance costs. Small considerations in routine maintenance can bring significant benefits, so it's essential to invest time in these details to prevent issues at critical moments. As a professional manufacturer of rolling mills, we naturally have a deep understanding of the maintenance and care required for these machines.

Currently, most rolling mills are not designed for high rolling speeds. The reason is that when the linear speed is at a moderate level, the rolling mill operates more steadily with lighter wear, albeit at a lower production capacity. Extensive research has shown that appropriately increasing the rolling speed of the rolling mill is an effective method to improve rolling efficiency. The rolling mill is an indispensable steel rolling equipment in steel mills, and methods and effects to increase the rolling mill line speed have been practiced in some domestic steel mills.

In the daily maintenance of the rolling mill, special attention should be given to observing the rolling rolls and gear parts. If there are any issues with either the rolls or gears, it directly affects the normal operation of the rolling mill. Let's take a look at some related issues with rolling rolls and gears: the rolling mill displays tooth damage due to inaccurate gear parameter measurement. When modifying and measuring gears, inaccurate helix angles and modules result in significant differences in gear tooth profiles compared to the old ones. The meshing coincidence of the rolling mill is small, causing large impact and high stress at a certain point of the gear, making the gear prone to fracture. A useful solution is to adjust the parameters of each gear inside the gearbox to ensure accurate and error-free gear parameters for precise processing.

Immature heat treatment processes, the lack of quenching and strengthening on the tooth root of the new gear, results in low bending strength of the rolling mill. The quenching and strengthening layer on the tooth surface is too shallow and cannot withstand the impact load for an extended period, causing premature crushing and deformation. Once there is poor accuracy in the tooth profile, increased clearances introduce additional loads. A useful approach is to establish a reasonable heat treatment process, determine the bending resistance of the tooth root based on the structure, and strengthen it through quenching. To ensure that the rolling mill gear can withstand the contact load for an extended period and prevent premature crushing and deformation due to the introduction of additional loads, it is necessary to redesign a reasonable thickness for the quenching and strengthening layer on the tooth surface.

In the production process of the metallurgical industry, the position of the rolling mill is irreplaceable. Due to prolonged friction between the rolling pieces and the rolls, wear on the rolls is inevitable, affecting rolling requirements and increasing the frequency of roll adjustments. It is recommended to select suitable rolls based on the material of the rolling mill and design the hole type reasonably to improve the wear resistance of the lubricating grease in the rolling mill.

Method to increase rolling mill speed: Increase the number of teeth on the gear to change the transmission ratio. The module of the small gear of the rolling mill remains unchanged, so the pitch circle of the small gear increases. Some small mills use belt drive, and the rolling mill can change the diameter of the transmission belt pulley to achieve the desired result. The method of increasing the rolling mill speed is simple and easy to implement.

Practical effects of increasing rolling mill speed: After increasing the rolling mill speed appropriately, when ensuring the same rolling product, the productivity of the rolling mill increases by 10-20% when the rolling speed is increased by 8-15%.

Increased wear of rolls and guides: After increasing the rolling mill speed, the wear of rolls and guides increases. The wear of rolls and guides is exacerbated after the speed is increased. As for whether the benefits brought by the increase in productivity after the rolling mill speed is increased can offset the loss of increased wear on rolls and guides, further testing is needed in the rolling mill.