合理的模具设计。在级进模中,下料顺序的安排有可能影响到冲压件成形的精度。针对冲压件细小部位的下料，一般先安排较大面积之冲切下料，再安排较小面积的冲切下料，以减轻冲裁力对冲压件成形的影响。
Reasonable mold design. In progressive die, the order of blanking sequence may affect the accuracy of stamping forming. In order to reduce the impact of punching parts, the punching and cutting blanking of ***all area is arranged in the light of the blanking of the ***all parts of the stamping parts.
简单来说钣金件是金属薄板壳体，冲压件就是用拉伸机或冲床等加工的工件1，钣金件在折弯过程中厚度不会有变化，但在汽
车钣金壳体中应为敲击等原因，一部分表面会有一定变化。冲压厂是不能确定落料尺寸的，应该是在定做模具时由模具厂试定出来的。
In a simple way, the sheet metal part is a metal sheet shell, and the stamping part is 1 of the workpiece, which is processed by a drawing machine or a punch press. The thickness of the sheet metal parts will not change during the bending process, but in the steam.
The surface of the automobile shell should be knocked and so on. Part of the surface will change. The stamping plant is unable to determine the blanking size. It should be determined by the mold factory when making the mould.
手锯加工方法
扁钢的锯削：在扁钢锯口处划一周圈线，分别从宽面的两端锯下，两锯缝将要结接时，轻轻敲击使之断裂分离。这样锯削，而且能较好地防止锯齿崩缺。反之若从窄面下锯，非但不经济，而且只有很少的锯齿与工件接触，工件越薄，锯齿越容易被工件的棱边钩住而折断。
Processing method of hand saw
Sawing of flat steel: a circular line at the cutting edge of flat steel, which is cut down from the two sides of the wide surface. When the two saws will be tied, it will be gently tapped and broken apart. The sawing efficiency is high, and the sawtooth collapse is prevented. On the , if it is sawed under the narrow face, it is not economical, and only a few teeth are touched with the workpiece. The thinner the workpiece is, the more easily the sawtooth is caught and broken by the edges and edges of the workpiece.
手锯锯削的注意事项
锯条的松紧要合适，且锯割时压力不能太大，以防折断伤人；
当锯缝歪斜时，不可急于纠正，而需要慢慢地逐步纠正。
Notice of hand saw cutting
The tightness of the saw blade should be suitable, and the pressure should not be too large during sawing, so as to prevent breaking and hurting people.
When the SAW seam is skewed, it can not be corrected in a hurry, but it needs to be corrected gradually.