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Korean Journal of Metals and Materials > Volume 55(5); 2017 > Article
Korean Journal of Metals and Materials 2017;55(5): 320-327. doi: https://doi.org/10.3365/KJMM.2017.55.5.320
연속주조의 유압식 주형진동 제어인자 고찰
강기판, 김성연, 이상현
포스코 엔지니어링솔루션실
Review of the Control Parameter for Hydraulic Mold Oscillation in Continuous Casters
Gi Pan Kang, Seong Yeon Kim, Sang Hyeon Lee
POSCO, Engineering Solution Dept.
Correspondence  Gi Pan Kang ,Tel: +82-54-220-9224, Email: gpkang@posco.co.kr
Received: 23 August 2016;  Accepted: 29 October 2016.  Published online: 9 May 2017.
ABSTRACT
In order to improve the flexibility of the oscillation pattern for a wide range of casting speeds, a hydraulic cylinder is used to oscillate the mold that moves up and down according to the stroke and frequency given by controller. Currently, hydraulic oscillators are commonly used in continuous casting facilities, but there are mismatched definitions in the control parameters. The primary object of the mold oscillation is to minimize the friction force between the mold copper plate and the solidified shell. The casting speed is tested up to 7.5 m/min, and the effect of the oscillation is analyzed in a pilot plant. As the casting speed increases, the lubrication effect reaches its limits. Therefore, various oscillation patterns are examined. The orientation of the oscillation pattern that achieves the lubricating function is determined. However, efforts to reduce the friction force are constrained by the moving energy of the oscillating system. Despite these constraints, the optimal oscillation pattern is determined for a wide range of casting speeds. Furthermore, the size of the negative strip time (NST) is no longer important in the hydraulic oscillation, and the definition should be modified in order to reflect this. Therefore, a new definition of the negative strip ratio (NSR) is introduced.
Keywords: continuous caster, mold, oscillation, hydraulic, asymmetry, NST, NSR
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