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.
五金冲压模具的安装是否正确合理，不仅影响五金冲压件的产品质量和精度，还会影响模具的工作寿命及生产安全。并且熟练掌握冲压模具的安装也是每个冲压工应该掌握的技巧。
Whether the installation of the metal stamping die is correct and reasonable, not only affects the quality and precision of the metal stamping parts, but also affects the working life and production safety of the die. And skilled in stamping die installation is also a skill that every stamping worker should master.