Stamping die basically does two things for metal plate. One thing is cutting, including all the actions to separate the plate, such as blanking, punching and trimming. Another thing is deformation, that is to change the shape of the plate, including all stamping actions that do not separate the plate and only change the shape, such as drawing, bending and bulging.

冲压成形模具的表面处理很重要，因为冲压件只跟模具的表面打交道。理想的金属板材成形模具的表面，必须是。光， 即比较高的光洁度，(几微米，关键的地方小于1微米。滑， 即比较低的摩擦系数， (小于0。

The surface treatment of stamping forming die is very important because stamping parts only deal with the surface of die. The surface of the ideal sheet metal forming die must be. Light, i.e. relatively high finish, (a few microns, less than 1 micron in key places). Slip, i.e. relatively low friction coefficient, (preferably less than 0).

。坚，即有较深的，硬度比较高的近表面层， (距表面少1mm内，硬度不能太低。硬，即模具的表面要有很高的表面硬度， (大于如果模具表面比较光滑，比如镀硬铬以后，模具和板材在冲压成形时相互摩擦，比较不容易产生的大量的微粉末。产生的微粉末， 也比较不容易滞留在模具表面上，有利于保持干净的模具表面状态。

Hard, i.e. there is a deep near surface layer with high hardness (the hardness shall not be too low within 1mm from the surface). Hard, i.e. the surface of the die shall have high surface hardness, (larger than if the die surface is relatively smooth, for example, after hard chromium plating, the die and plate rub against each other during stamping, which is less likely to produce a large amount of micro powder. The generated micro powder is also less likely to remain on the die surface, which is conducive to maintaining a clean die surface.

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