Method for reducing edge sawtooth-shaped burr chain defect of hot-rolled oriented silicon steel

The invention relates to a method for reducing edge sawtooth-shaped burr chain defects of hot-rolled oriented silicon steel, which comprises the following steps of: heating a casting blank with set chemical components in a furnace, and controlling process parameters of the heating in the furnace, so that columnar crystals in the structure of the casting blank normally grow; rough rolling is conducted on the casting blank heated in the furnace, the vertical roll rolling reduction of rough rolling is controlled so that the edge extrusion deformation heat and edge plasticity of the casting blank can be improved, and an intermediate blank is obtained; and the intermediate billet is subjected to finish rolling, the edge of the intermediate billet is heated again, and the vertical roll rolling force of finish rolling is controlled, so that the edge plastic deformation capacity of the intermediate billet is improved, and the oriented silicon steel is obtained. The technical problem of how to reduce the edge sawtooth