The Concept Of Rolling Mill Rigidity

The rolling mill generates huge rolling force in the steel rolling production process, which is passed through the rolls, bearings, pressing screws, and finally to the stand, which is borne by the stand. All these parts on the rolling mill are stressed parts, and they all produce elastic deformation under the action of rolling force. For this reason, the actual gap between the rolls when the rolling mill is stressed must be larger than when it is unloaded. Usually we call the roll gap at no load as roll gap S0, and the increase in roll gap elasticity of the rolling mill during steel rolling is called bounce value.

The bouncing value reflects the deformation of the rolling mill after the rolling stand is stressed from the general aspect, and it is proportional to the rolling force. Under the same rolling force, the smaller the bouncing value of the rolling mill, the better the rigidity of the rolling mill. Therefore, the concept of the rigidity of the rolling stand is the ability of the rolling mill to resist elastic deformation.

Characteristics and damage forms of reducers in rolling mills

Features of main reducer:

Low speed, heavy load, large shock load, and frequent shocks There are currently two configurations of the reducer used for the main rotation of small and medium rolling mills:

Electric motor – reducer – rolling mill

Electric motor – reducer – gear stand – rolling mill

In the first configuration mode, the reducer is directly connected to the rolling mill and works under severe load. Therefore, the design should be differentiated according to the specific application and configuration conditions, and the second configuration mode should be adopted in the design.

The damage form of the main reducer gear

Production practice has proved that the main forms of gear damage in rolling mill reducers are pitting corrosion, shrinkage deformation, gluing, wear, and spalling instead of broken teeth.

 

Factors leading to slower start-up of rolling mill equipment

The start-up speed of the tight-rolling equipment is very important for the efficient work of the rolling mill. The worst thing is that the start-up speed of the rolling equipment is slow when it is ready to run. It not only seriously affects the working efficiency of the rolling mill, but also the force between the billet or the rolling stock and the roll cannot reach a good state. It shows that there are obvious deficiencies in the performance of the rolling mill. If the speed of the rolling mill is not effectively improved, the efficiency of the billet or rolling stock will become lower and lower. Then, the rolling speed of the larger billet will be too slow. Here, we will analyze the reasons for the slow start-up speed. Before starting the rolling mill, it is necessary to verify the motor power of the equipment, rolling speed, product specifications, pass technology, etc., to ensure that the amount of billet transfer is not too large to exceed the bearing capacity of the rolling equipment. Otherwise, the starting speed of the equipment will be slowed down, and the bearing of the rolling mill should be checked to see if the lubrication of the bearing is sufficient.