Stamping Die Terminology Basics

1：Curl Bending is a stamping process that rolls the edge of the process part into a closed circle. The axis of the curled circle is straight.

2：Rolling edge is a stamping process that rolls the upper edge of the hollow part into a closed circle.

3：Drawing  is a stamping process that turns straight wool or process parts into curved surfaces. The curved surfaces are mainly formed by the extension of the material at the bottom of the punch.

4：Pull-bending  is a stamping process that realizes bending deformation under the combined action of tension and bending moment, so that the entire bending cross-section is subjected to tensile stress.

5：Bulging is a stamping process that expands a hollow part or a tubular part radially outward. Sectioning Sectioning is a stamping process that divides the forming process into several parts.

6：Restriking is a stamping process to improve the flatness of local or overall flat parts.

7：Relief forming is stamping processes that rely on the extension of materials to form partial depressions or protrusions in the process parts. Changes in material thickness in relief forming are unintentional, that is small changes in thickness occur naturally during deformation and are not a design-specific requirement.

8：Bending  is a stamping process in which the material is plastically deformed by pressure, thereby being bent into a shape with a certain curvature and a certain angle.

9：Triming is blanking or punching processes using sharp-edged chisel dies. There is no lower die for chisel cutting, only a flat plate is placed under the material, and most of the punched material is non-metallic.

10：Deep hole blanking is a punching process when the hole diameter is equal to or smaller than the thickness of the material to be punched.

11：Blanking is a stamping process that separates materials along a closed contour. The separated materials become workpieces or process parts, most of which are flat.

12：Narrowing is a stamping process that pressurizes the opening of a hollow or tubular part to shrink it.

13：Shaping is a stamping process that relies on the flow of materials and changes the shape and size of the process parts in a small amount to ensure the accuracy of the workpiece.

14：Refurbishment is a stamping process in which a small amount of material is cut along the outer or inner contour to improve the edge finish and verticality. The refurbishment process generally also improves dimensional accuracy at the same time.

15：Burring is a stamping process of turning the material around the inner hole into a side vertical flange.

16：Flanging is a stamping process that turns the material into short sides along the contour curve.

17：Deep drawing  is a stamping process that turns straight wool or process parts into hollow parts, or further changes the shape and size of hollow parts. During deep drawing, the hollow part is mainly formed by the flow of material outside the bottom of the punch into the die.

18：Continuous deep drawing is a stamping method in which the required shape and size are gradually formed by multiple deep drawing with the same die (continuous drawing die) on the strip (coil material).

19：Thinning and deep drawing is a deep drawing process in which the hollow process part is further changed in shape and size, and the side wall is intentionally thinned.

20：Reverse deep drawing and reverse drawing are a deep drawing process in which the inner wall of the hollow process piece is everted.

21：Differential temperature drawing is a kind of drawing process that uses heating and cooling methods to make the temperature of the material to be deformed much higher than that of the material that has been deformed, thereby increasing the degree of deformation.

22：Hydraulic deep drawing is a kind of deep drawing process in which the liquid contained in the rigid or flexible container is used to replace the punch or die to form a hollow part.

23：Beading is a kind of undulating forming. When local undulations appear in the form of ribs, the corresponding undulation forming process is called bead pressing.