Improvement of electric drive of withdrawal and straightening unit in continuous casting machine

The purpose of the paper consists of development of techniques and determination of influence of operating parameters of the withdrawal rolls' electric drive on certain types of billet macrostructure defects and development of an automated electric drive of withdrawal rolls on their basis. An automated electric drive of withdrawal rolls should ensure the increase of machine productivity through the enhance of billet casting speed due to improvement of quality of the internal billet structure. Solution of the assigned problem is based on the analytical and numerical methods of solving algebraic problems and mathematical modeling required according to distribution of the load moments on the electric drives of withdrawal rolls and calculation of the longitudinal forces generated by the electric drive in crystallizing ingot and also the methods of statistical treatment of a large data volume about billet macrostructure defects and performance indicators of the electric drives of withdrawal rolls. The paper novelty is in development of requirements for the automated electric drive of withdrawal rolls and its control system aimed at quality improvement of continuous cast billets. At the same time, the novelty is presented by development of the methodology for statistical assessment of influence of distribution of electric drive load currents of withdrawal rolls and statistical longitudinal forces generated by the electric drive of withdrawal rolls in billet on its macrostructure quality.