Method for determining double-length trimming speed

The invention discloses a method for determining a double-length trimming speed, and belongs to the technical field of steel smelting. When the double-length shear is used for shearing, Vx is controlled to be equal to Vfinished + (1.2 +/-0.5) m/s, Vx is the horizontal component of the linear speed V of the double-length shear in the X direction, and V is the roller linear speed of a finished rolling mill. Vx is calculated through a formula, but the finished product sheared by the double-length shear has prompt drop, a lowest speed point is generated, the speed value is Vxmin m/s at the moment, in order to ensure that the head of the finished product is not bent, the speed Vxmin of the double-length shear is greater than the roller linear speed Vfinished of a finished rolling mill, but the state of the Vxmin is changed when the Vxmin is sheared, and the Vxmin is changed when the finished product is sheared. The Vx needs to be subjected to certain speed compensation, so that the double-length shear can smoothly