There is an essential difference between the process characteristics of fine blanking and ordinary blanking. Normal blanking controls the tearing of the sheet during the blanking process, while fine blanking tries its best to suppress the tearing of the sheet during the blanking. The fine blanking is always kept as one body before the parts are separated from the sheet material, and the metal sheet is always in the plastic deformation process during the fine blanking process.

　　In order to achieve this purpose, the V-shaped blank holder and the counter-pressure plate first press the sheet before punching to prevent the movement of the inner and outer metal sheets during the punching process. In addition, with the small gap between the convex and concave dies and the appropriate small rounded corners of the concave die, the three-way compressive stress state of the local area of the punching is formed during the punching process, so as to ensure the plastic deformation process of the punching. In addition, the fine blanking material and lubrication state also have a great influence on the fine blanking effect. The material with fine spherical carbide structure with good plasticity, low deformation resistance, complete spheroidization, good dispersion and uniform distribution is most suitable for fine blanking. Good lubricants not only improve the quality of fine-blanking parts, but also help reduce the wear of the mold and increase the service life of the mold.