where is the ultimate strength of sheared plate (MPa) ; is the elongation of sheared plate; h is the thickness of sheared plate (mm); is the shear angle (°) ; is the blades clearance (nun) ; C is the distance between binder foot axis and static blade (mm); X is the relative distance of binder foot, where X = C/h ; Y is the relative clearance of shear lateral, where Y = /h; Z is the bend coefficient which is related to the sheared length L, shear angle ,shear plate thickness h and metal elongation .