Chapter 15 - Fundamentals and advancements in longitudinal rolling

Abstract

The chapter provides fundamental information and some advanced approaches on the longitudinal rolling of metals. It presents historical data on the appearance and development of longitudinal rolling. The basic provisions of the theory of longitudinal rolling are given. The innovative directions of improving this effective process are considered. The sections devoted to the basics of rolling theory provide methods for calculating the basic geometric parameters of the process. In particular, there are given formulae for calculating the parameters of the actual deformation zone, and the results of studying the conditions for metal bite by rolls. Conditions of free, forced, and dynamic bite of metal by rolls are considered. Ways to increase the biting ability of the rolls are described. The chapter provides a modern understanding of the kinematic conditions of the longitudinal rolling. The stages of the process are described. It also shows the effectiveness of using CAD tools for the study of the process. As examples, methods are considered and the results of research and improvement of roll cooling systems, rolling of workpieces in rolls with a wave-like profile, etc., are presented. It is noted that hot longitudinal rolling is a combination of two processes: thermal and deformation. Modes of thermal and mechanical processing are shown to affect the quality of rolled products significantly and to be the most important innovative direction for increasing the efficiency of longitudinal rolling. It is concluded that a special direction in the development of longitudinal rolling is the improvement of automated process control systems. It is noted that the introduction of such systems at factories significantly facilitates the working conditions of personnel, increase productivity, provide a significant reduction in energy consumption, and improve product quality.