Features of functioning of the working stand of the automatic mill in the pipe-rolling unit
Journal Title: Комп’ютерне моделювання: аналіз, управління, оптимізація - Year 2018, Vol 2, Issue 2
Abstract
The bottleneck of unit for production of seamless hot-rolled pipes is an automatic mill. The complexity of the analysis of the phenomena occurring in the deformation zone of the automatic mill, due to the fact that the core product, together with the rollers and the mandrel, is affected by the core mechanism for holding the mandrel on the rolling axis. This fact forms a specific initial conditions not only for the flow of the process, but also determines the complex behavior of the working stand. The least studied among the processes accompanying the process of rolling sleeves on an automatic mill are the behavior of the complex, including the frame of the working stand with all its containment mechanisms. Studies of the operating conditions of pipe-rolling unit (PRU) with automatic mills shows that their distinctive feature in the technological cycle of rolling seamless pipes is the presence of non-stationary dynamic processes. In this case, the loads during the periods of capturing the liner, for example, on an automatic PRU 350 mill, are 3–5 times greater than the loads during the steady rolling process. The mathematical model of the process of interaction of the rolled billet with the elements of the working stand, which is considered in the well-known works, does not allow to fully represent the features of the functioning of the working stand in the process of rolling the liner. The results of the study of the refined dynamic model of this complex of an automatic mill of a PRU tube rolling mill are given. Pictures of the vibroactivity of the elements of the working stand and supporting units of the mechanism for holding the mechanical system are obtained. On the example of calculating the dynamics of the working stand of an automatic PRU 350 mill, some features of the functioning of a mechanical system with four degrees of freedom are established. The dynamic parameters of the working stand of the automatic mill and the mechanism of its retention, affecting the value of such an important parameter as spacing of rolled sleeves are revealed. This allowed us to formulate proposals for improving the components of the retention system of the working stand of the automatic machine PRU 350.
Authors and Affiliations
С. Р. Рахманов, В. Т. Вышинский, С. В. Пача
Keywords
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- EP ID EP610392
- DOI 10.32434/2521-6406-2018-4-2-65-72
- Views 261
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