The method of restraining the turning over and twisting of stamping parts

(1) reasonable mold design. In progressive die, the arrangement of blanking sequence may affect the forming accuracy of stamping parts. In order to reduce the impact of punching force on the forming of stamping parts, large area blanking is usually arranged first, and then small area blanking is arranged.

(2) press the material. In order to overcome the traditional mold design structure, a material holding gap is opened on the discharge plate (that is, when the mold is closed, the material can be compressed). For the key forming parts, the discharge plate must be made into a inlaid structure, so as to solve the abrasion (compression) damage caused by the pressing part of the discharge plate caused by long-time stamping, and the material cannot be compressed.

(3) add strong pressure function. That is to say, the thickness of the pressing part of the discharge insert is increased (the normal thickness of the discharge insert is H + 0.03mm), so as to increase the pressure on the material at the die side, so as to prevent the stamping parts from turning over and distortion during punching.

(4) bevel or arc shall be made at the edge end of the punch. This is an effective way to reduce the punching force. By reducing the buffer cutting force, the drawing force on the die side material can be reduced, so as to achieve the effect of preventing the stamping parts from turning over and twisting.

(5) in daily mold production, attention should be paid to maintain the sharpness of punch and die edge. When the cutting edge is worn, the tensile stress of the material will increase, so that the tendency of turning over and twisting will increase.

(6) unreasonable or uneven blanking clearance is also the cause of stamping parts turning and twisting, which needs to be overcome.