Per: Giulliane Meireles Casali Gonçalves (ARCELORMITTAL), RAFAEL DOS SANTOS NASCIMENTO (arcelormittal ), rafael lopes (arcelormittal), Caio Marcello Felbiner Azevedo Cossú2 (universidade estacio de sá), Iury Otaviano De Oliveira (arcelormittal )
Abstract:
In the present work, the manufacturing process of round bars obtained in the hot rolling process is studied, which present quality deviations caused by excessive warping or above what is acceptable by the customer. The lamination process forms the raw material that passes between two rotating rollers that compress it, and have their section reduced and their length increased. It is a process that allows to obtain high productivity and good dimensional accuracy, in addition to a certain variety of shapes. In this process, the material is subjected to high compressive stresses, resulting from the direct action of two rolls, and to surface shear stresses, resulting from friction between the rolls and the material. Round bars are used in various segments of the industry, but mainly for the mechanical construction sector. The study aims to identify the process variables, which present the best result in relation to warping. For this, it was observed during the production campaigns which steel and process configurations had the lowest incidence of warping. Warping is an irregular geometric configuration being a limiting factor to meet the quality requirements demanded by the market. To assist in the analysis of the results, the DOE tool was used, which evaluates the variation of the results according to each parameter and with the interaction of the parameters. In this way, it was possible to verify the best condition to minimize the occurrence of warping.