Due to differences in the shape, size, precision requirements, and raw material properties of stamping, the stamping processes currently used in sub production can be divided into four categories: punching, bending, stretching, and forming. What processes are involved in the punching process today.

Stamping processing - punching process:

1. Material cutting - using a die to punch along a closed contour curve, the stamped parts are used to manufacture various shapes of flat parts.

2. Stamping - using a die to punch and cut according to a closed contour curve.

3. Cutting - using scissors or a die to punch along non closed curves, often used for processing simple shaped hardware parts.

4. Revision - Trimming or cutting the edges of formed stamped parts into a certain shape.

5. Tongue cutting - a stamping process in which the material separates along the contour of the opening, rather than completely separating. The partially separated materials have a certain position required for manufacturing and are not on the plane of bathroom separation.

6. Slicing - cutting stamped parts into semi-finished products, and then cutting them into two or more parts, often used for symmetrical parts formed by stamping in pairs or groups.

Stamping processing - bending process:

1. Bending - the stamping process of bending bars, plates, pipes, and profiles into a certain angle and shape.

2. Roll round - Roll the end of the paper material into a nearly closed round head, used for processing similar dumpling chains.

3. Twist - Twist the punched semi-finished product to a certain angle.

Stamping processing - stretching process:

1. Deep drawing - using a deep drawing die, under the action of a press, a pre cut or stamped flat blank of a certain shape is made into an open hollow part, or the already made open hollow part is processed into other shapes of hollow parts.

2. Thinning and deep drawing - further processing the hollow semi-finished product after deep drawing into a part with a bottom thickness greater than the side wall thickness.

Stamping processing - forming process:

1. Flipping - Punching pre punched semi-finished or uncut materials into upright edges.

2. Flanging - Forming the edges of semi-finished sheet metal into upright edges according to curves or arcs.

3. Expansion type - deformation is achieved under the action of biaxial tensile stress, forming stamped parts with various spatial surface shapes.

4. Shrinkage - reducing the radial size of a hollow or tubular blank at a certain position.

5. Expansion - Expanding the radial dimension of a hollow or tubular blank at a certain position.

6. Fluctuations - Various shapes of protrusions or depressions formed on the surface of sheet metal blanks or stamped parts through local forming methods.

7. Shape correction - correcting the shape of parts to improve the dimensional accuracy of formed parts or obtain smaller fillet radii.

In actual production, when the production volume is large, a combination process is generally used, which combines two or more basic processes into one process, forming the so-called composite mold, multi station progressive mold, composite progressive mold combination process, etc.