Methods For Restraining The Overturning And Twisting Of Stamping Parts

(1) Reasonable mold design. In the progressive die, the arrangement of blanking sequence may affect the forming accuracy of stamping parts. For blanking of small parts of stamping parts, generally, the blanking of large area is arranged first, and then the blanking of small area is arranged to reduce the impact of blanking force on the forming of stamping parts.
(2) . Hold down the material. Overcome the traditional mold design structure, and open the material holding gap on the discharge plate (that is, when the mold is closed, the discharge plate fits with the female mold, and the gap between the discharge plate and the female mold at the place where the material is contained is t-0.03~0.05mm thick). In this way, the unloading plate moves smoothly during stamping, while the material can be pressed tightly. For the key forming parts, the discharge plate must be made into an inlay structure, so as to solve the abrasion (pressing) damage caused by the pressing part of the discharge plate caused by a long time of stamping, which cannot compress the material.
(3) Add strong pressure function. That is, thicken the size of the blanking part of the unloading insert (the normal unloading insert thickness is H+0.03mm) to increase the pressure on the material at the side of the female die, so as to inhibit the turnover and distortion of the stamping parts during punching.
(4) The end of the punch edge is trimmed with an inclined plane or arc. This is an effective way to reduce the blanking force. By reducing the buffer cutting force, the tensile force on the material at the side of the die can be reduced, so as to achieve the effect of inhibiting the turnover and distortion of the stamping parts.
(5) In the daily mold production, attention should be paid to maintaining the sharpness of the cutting edges of the punch convex and concave dies. When the cutting edge is worn, the tensile stress of the material will increase, and the tendency of turning over and twisting of the stamping parts will increase.
(6) . Unreasonable or uneven blanking clearance is also the cause of turnover and distortion of stamping parts, which needs to be overcome.