Metal stamping parts forming has several very prominent characteristics:

　　(1) when forming metal stamping parts, the internal stress in the blank is close to or equal to the yield stress of the material, sometimes even less than the yield stress of the sheet metal. During forging and extrusion, the internal stress of the blank may exceed its yield stress by many times. At this point. The difference is huge. Therefore, in the forming of metal stamping parts, the influence of hydrostatic pressure on forming limit and deformation resistance in the stress state of deformation zone and its influence rule have lost its importance in the volume forming. In some cases, it may even be dismissed altogether, even if it is necessary to do so from a different point of view than the treatment.

　　(2) due to the metal stamping parts processing forming blank relative thickness (and the size of the plate) is very small. Under the action of compressive stress, the anti-instability ability is also very poor, so it is difficult to successfully carry out the forming process of metal stamping parts in free state without the constraint action of anti-instability device (such as pressure diagram, etc.). Therefore, among all kinds of forming methods of metal stamping parts, the forming process of elongation metal stamping parts is more than that of compression metal stamping parts.

　　(3) due to metal stamping parts forming blank thickness is far less than its plate size. The force of the tool on the blank can only be conveniently applied to the sheet metal. And the unit pressure force perpendicular to the direction of the plate surface, which is not large in value, can cause the internal stress in the direction of the plate surface which is large enough to make the plate produce plastic deformation. As a result of perpendicular to the direction of the surface of the unit pressure is far less than the direction of the surface of the internal stress, so most of the metal stamping parts can be approximately as flat and stress state to deal with, so that deformation mechanics and the calculation of process parameters and other work, have been greatly simplified.