In the daily operation of stamping parts, it will encounter the case that the punching scale is too large or too small (maybe across the standard pleading) and the difference with the scale of the punch is large, except for the planning scale and processing of the forming convex and concave molds. Accuracy and blanking gaps are exceptional, and should be considered from the following aspects.
1. The result of the burrs of the punching parts that occurred during the punching. It is necessary to study the cutting edge and pay attention to see if the blanking clearance is reasonable. Caused by the instability of the stampings during bending. Mainly for U-shaped and V-shaped bending. The treatment of this problem, the guiding position before the bending of the stamping part, the guiding position during the bending process, and the pressing of the data during the bending process to avoid the slippage of the stamping part during the bending is the main point of solving the problem. Caused by the burrs of the punching that occurred during the punching. It is necessary to study the cutting edge and pay attention to see if the blanking clearance is reasonable.
2. When the cutting edge wears, the tensile stress of the data increases, and the tendency of the stamping parts to turn over and twist is increased. When the attack is turned over, the punching scale will become smaller. The strong pressure on the data makes the plastic deformation of the data, which will lead to a larger punching scale. When the strong pressure is reduced, the punching scale will become smaller.
3. The shape of the end of the punch edge. If the end is repaired by a bevel or an arc, the punching force is easily relieved due to the relief of the punching force, and thus the punching scale will become larger. When the end of the punch is flat (no bevel or arc), the punching scale will be relatively small. In the detailed operation of the actual situation, a detailed analysis of the detailed title problem should be made, and then the countermeasures to solve the problem should be found.