A Study on the Characteristics of Automatic Flatness Control System for Cold Rolling

냉각압연 가공용 자동 형상제어장치의 특성에 관한 연구

  • Kim, Moon-Kyung (Dept.of Mechanical Design Engineering, Graduate School of Busan National University) ;
  • Jeon, Eon-Chan (Dept.of Machanicals Engineering, Donga University) ;
  • Kim, Soon-Kyung (Dong Eui Techncal Junior College)
  • 김문경 (부산대학교 대학원 기계설계공학과) ;
  • 전언찬 (동아대학교 기계공학과) ;
  • 김순경 (동의공업전문대학 자동차과)
  • Published : 1996.09.01


Flatness of cold rolled strip is vital to the quality of the product and productivity of the mill. Therefore, in recent year requirement for flatness control in strip rolling have become increasingly severe. The necessity for more accurate automatic gauge control and automatic flatness control(AFC) has increased by customer's requirement for cold rolled steel sheets with thinner gauge and better flatness quality. In this paper, the performance and functions of AFC system installed on the 4 hi-reversing mill has been investigated under actual conditions. The test results are as follows : The more strip thickness is thick, the smaller the I-value. The I-value is a strain measured by stressometer. Complex distributions of strip tension are controlled to remove not only a quarter buckle but also a simple center wave and edge wave. The defects caused by poor flatness have been drastically decreased. And a proper coolant temperature for work roll cooling system on the AFC system is about $50~55^{\circ}C$.


4 Hi-Reversing Mill;Automatic Flatness Control System;Tension;Flatness;Stressometer