Adjusting roll gap to correct the phenomenon of camber and side walk

• Main Authors: Chun-Han Wu, 吳俊翰
• Other Authors: Jong-Ning Aoh
• Format: Others
• Language: zh-TW
• Published: 2016
• Online Access: http://ndltd.ncl.edu.tw/handle/44161139455048427802

碩士 === 國立中正大學 === 機械工程系研究所 === 104 === In hot rolling process, the temperature gradient on the slab may cause camber along longitudinal direction and deviation in transverse direction (side walk). These two phenomena will affect the quality and the geometry of the strip plate after rolling. As the strip is very thin, it may flatter when passing through the finishing rolls at high speed and may result in instability during finishing rolling process. One of the instability is the flap of slab tail. The tail may hit the finishing rolls and side guides and cause damage both on slab and on rolls. Therefore it is necessary to adjust the roll gap between the horizontal rolls, i.e. the level, to correct the camber and side walk of the strip. Finite element analysis using ABAQUS was applied to establish a numerical model for and finish mill of hot rolling process. The model of the strip and finishing rolls and its operation conditions were defined based on the actual geometrical and mechanical conditions of the finishing rolling line. The effect of roll gaps on the camber and side walk of steel slab was systematically analyzed by investigating the results obtained from FEM analysis. The simulation result successfully duplicated the sudden differential force increase of horizontal rolls, if the camber of the slab was significant enough. From the results of the simulation was found that the relationship between the level and the net correction of side walk is linear in the same finishing mill. Larger geometric parameter allows more net correction of the side walk when the level of finishing mill is fixed.