Influence of Temperature Difference on Front End Bending in Hot Slab Rolling

Abstract

Front end bending often occurs in the heavy plate mills and roughing stands, which reduce productivity efficiency and the quality of the plates considerably. The effect of temperature difference between top and bottom surfaces of slab and reduction ratio on front end bending was investigated by 3D FEM and the mathematical model was induced. The hexahedral mesh was generated by HyperMesh and embed into the DEFORM system. The results show that the temperature difference leads to the asymmetric distribution of equivalent stress, strain and strain rate in the deformation zone. With the increment of temperature difference and reduction ratio the slab head bends more significant. Additionally, the slab front end perhaps bends to higher temperature side in double phase rolling because of resistance of deformation with different phase. Reducing temperature difference, reducing reduction ratio and avoiding double phase rolling is benificial to reduce front end bending in hot slab rolling.