ホットストリップ冷却後の平坦度不良の解析

抄録

To analyze non-flatness caused by the edge wave of hot strip after cooling, a numerical method for the prediction of temperature and thermal stress has been developed by taking phase transformation into consideration. It is confirmed that temperatures during cooling and residual stresses calculated by the present method agree well with the measured ones. On the bases of the present method, the occurrence of the edge wave in thin and wide hot strip (3.24×2173mm) has been studied.
The results obtained are as follows;
(1) The edge wave occurs when compressive residual stress at edge part becomes greater than the critical buckling stress.
(2) The residual stress becomes low when the distributions of finishing temperature and of cooling rate after rolling in transverse direction of hot strip are small. Water cooling of hot strip at later stage of run-out table and high coiling temperature are benificial to decrease the residual stress.
(3) The most effective measures of preventing the edge wave formation is to cool strip uniformly in transverse direction by controlling the distribution of water supply after rolling.