Исследование влияния режимов прокатки на эффективность проработки центральных зон сечения раската

Abstract

The use of continuously cast billets for the production of varietal profiles is one of the most important areas of modern metallurgy. When translating existing rolling mills to the use of continuously cast billets instead of the original rolled does not provide high-quality finished rolled products. Therefore, the development of deformation-temperature parameters of rolling and calibration of the rolls, which will ensure increased deformation of the axial zone of the roll for the necessary study of the cast structure is an important task. The solution of this problem will allow the transfer of existing continuous small-section and wire mills to continuously cast billets with a minimum increase in its cross section relative to the cross section of the rolled billet used in these mills and, therefore, with the minimum amounts of reconstruction activities. Analytical studies have been carried out to study the central zones of rollout using the simplified stress estimation method developed in the ISI of NASU. It is shown that with an increase in the cross-section of the original continuous-cast billet, the degree of development of the central zones of the roll decreases, which is quite logical and does not contradict the ideas established in the rolling theory. The well-known data confirmed that with an increase in the diameter of the rolls, an increase in the heating temperature of the original blanks, the use of cast iron rolls instead of steel, with other things being equal, the depth of penetration of the deformation increases. It was determined that the greatest degree of deformation of the central zones of rolls is provided by oval gauges (as compared to box gauges and rolling in rolls with a smooth barrel). As a result of analytical studies, it has been established that an increase in th e carbon content in steel within the limits allowed by the standards leads to an increase in the degree of stud y of the central zones of the section of the roll. The results can be used to determine the technological modes of production of rolled products, which provide an increased degree of deformation study of the central zones of the section of the roll.