Rotary flying shears is a widely used flying shears. It is located on a continuous rolling mill or crosscut unit and is used to shear steel plates or small sections with a thickness of less than 12mm. When this kind of flying shear machine is used as cutting head flying shear machine, its shear thickness can be up to 45mm. The blade of the rotary flying shearing machine makes a simple circular motion, so it can shear rolling parts with a speed of more than 15m/s.

　FIG. 9-1 is a schematic diagram of a rotary flying shear. Blade 1 is mounted on roller 2. When roller 2 rotates, blade 1 moves in a circle. The rotary flying shears for cutting head and tail are usually equipped with two blades on the roller, which respectively adopt cutting head and cutting tail. The flying shear adopts the starting work system. The rotary flying shears for cutting the ruler generally adopt the continuous working system. The rotary flying shears of small workshop usually install the blade on the lever which moves in a circular motion due to the narrow width of the rolling part (as shown in figure 9-2).

　　Drum or rotary flying shear blades for circular motion, upper and lower blade cut into the workpiece, in vertical direction is not parallel, rolled pieces after cutting head is not flat, so with shear diameter less than 30 mm ¢round steel or corresponding billet, as well as the sheet belt is advisable.