The Concept of Optimal Bar Roll Pass Design. Report 3. Space of Roll Pass Design Schemes

Abstract

Based on the system approach and on the experience accumulated at theoretical data, design and industrial development of bar rolling, the Chair “Metal Forming” of Ural Federal University develops the universal “Concept of optimum calibration”. The general ideology of roll pass design optimization is stated in article “The concept of optimal bar roll pass design. Report 1. Basic statements”. In the article “The concept of optimal bar roll pass design. Report 2. Calibers space” the structure, appointment and maintenance of the information block reflecting so-called “calibers space” are considered. According to the general concept of optimization, the following task that needs to be solved is the problem of creation of information block so-called “space of schemes of roll pass design” which will be used further as the first space of optimization. The concept “space of schemes of roll pass design of a bar-rolling mill” is considered as the space containing all possible virtual schemes of rolling of a concrete profile on the concrete rolling mill. For formation of the space of schemes of rail calibrations it is necessary to generate separate virtual schemes and to consistently fill this space with them. Thus, the space of calibrations schemes is formed of separate unique calibrations schemes. For formation of this space from separate calibers, it is offered to use the specialized algorithms which are “generators of schemes of roll pass design”. As an example, the structure of the generator prepared for creation of such space for rolling of railway rails is considered. It is revealed that all known rail calibrations can be presented in the form of essentially the same block structure which is used as the central element of the schemes generator of rail calibrations. Usage of described and similar generators in relation to rolling process of a concrete profile on the concrete rolling mill allows obtaining spaces of acceptable schemes of calibrations. Such spaces are necessary for the subsequent optimizing procedures for search of the best calibration scheme from all possible calibrations. The considered approach for creation of calibrations schemes space can be used during creation of computer-aided engineering systems and optimization of calibrations of rolling rolls.

Анализ Напряженно-Деформированного Состояния При Прокатке В Овальном Калибре, Реализующим Поперечный Сдвиг

“…Прокатка в калибрах, которая является одним из основных технологий получения длинномерных металлических изделий, обеспечивает большую гибкость в отношении проектирования технологического процесса. Например, для получения одного и того же профиля, одних и тех же размеров, на одном и том же прокатном стане, можно использовать разные схемы калибровки [1,2]. Вместе с тем традиционная прокатка в калибрах сопровождается меньшей степенью деформации металла, вследствие чего в готовом прокате наблюдаются остатки литой структуры [3].…”