Maintenance of Systems in Rolling Mill Industrial Production Lines

The sealing, guidance, and wear issues of hydraulic cylinders and main machine guidance parts operating under high temperature and high dust conditions in rolling mills have fundamentally solved the difficulties and short lifespan of hydraulic system maintenance. It completely replaces previous manual operations, achieves synchronized mechanical automation operations of multiple pushers, and increases the production operating rate per hour. The rolling mill is one of the main pieces of equipment in the charging area of the rolling mill workshop, and its role is to push the steel billets on the front roller path or the steel billets on the front charging platform into the heating furnace for secondary heating.

The design of the rolling mill adopts a mechanical pusher, with the structure mainly using a gear-rack configuration. The rolling mill has the advantages of simple structure, moderate overall size, high transmission efficiency, convenient maintenance, and low cost. The rolling mill has certain temperature requirements for the heating temperature of the steel billets in the rolling process, which is conducive to improving the plasticity of the steel and reducing deformation resistance. It is essential for reducing oxidation and burn loss, holding significant significance for wire production.

It consists of an electric motor, reducer, mechanical transmission components, shell, etc. Its primary features are smooth operation, large thrust, and the ability to push double-row billets. The hydraulic pusher consists of a hydraulic cylinder, hydraulic pump station, balance push rod, and base. It has simple planning, large thrust, low cost, and can also push double-row billets. The rolling mill is mainly used for front-end billets, and through the power output of the pusher, it gradually moves into the furnace for heating treatment.

Properly guiding the rolling piece into the roll gap to ensure stable deformation of the piece in the gap and achieve the required shape and size; exporting the piece from the gap to prevent entanglement; forcibly twisting or bending the piece to move in a certain direction. The working conditions of the guide and guard device are extremely harsh, mainly manifested as irregular forces, alternating thermal shocks caused by high-temperature and cold stimuli, severe friction under high-speed conditions, and extremely harsh lubrication conditions. Therefore, great attention should be paid to the planning of guide and guard devices, especially for guide and guard devices with irregular cross-sections. The rolling mill itself should have features such as reasonable structure, strong wear resistance, solid fixation, convenient and safe loading and unloading, and sensitive adjustment. Continuous improvement in the planning, manufacturing, wear-resistant material, and usage adjustment level of guide and guard devices is essential in the rolling mill industry.

High-temperature casting temperature of the rolling mill: It is easy to cause cracks in the later stage of forming the billet, and these cracks mainly occur in the part of the mold where heat is concentrated. In the steam pressure ratio: it is often caused by excessive use of calcium-containing materials such as lime, resulting in excessive total heat generation of the billet, premature loss of fluidity, and thus causing cracks. These cracks are similar to those caused by too small water-cement ratio and too high casting temperature: The storage environment of the billet is also a major factor in causing billet cracks: its main reason is that the ambient temperature and humidity are too low, causing cracks around the billet due to temperature difference or rapid dehydration. This is also one of the reasons for the lack of edges and corners of the product. The negative side of cracks is adhesion. It is necessary to comprehensively consider various factors, start from multiple perspectives, find a suitable balance point, and achieve production quality goals. When the rolling mill maintenance operation is not standardized, the solution is: vacuum extraction. Timely drain condensed water. Ensure constant temperature and time.

During the heating process of steel billets, the iron elements on the surface of the steel billet react with oxidizing gases in the furnace gas, resulting in an oxidation reaction, forming iron oxide and causing metal loss. This phenomenon is called the oxidation burn loss of steel billets. The oxidation burn loss of steel billets is expressed by the burn loss rate, which means the percentage of the burned metal mass in the total mass of the steel billet. Oxidation burn loss reduces the yield of steel billets. When the oxidation burn loss is severe after rolling, the accumulation of iron oxide skin in the furnace increases the height of the furnace bottom, making it difficult for the maintenance of the furnace bottom and the operation of steel in the furnace. In the step-bottom heating furnace of the rolling mill, after the fixed bottom is raised, the stepping of the steel billet is hindered, and the iron oxide skin on the side discharge surface of the furnace bottom slag after the outlet section accumulates a lot. Therefore, the oxidation burn loss of continuous casting billets is large, which causes great damage to the furnace. Therefore, reducing the oxidation burn loss is of great significance to wire production.