FAQ

A stamping die is a special process equipment used to process materials (metal or non-metal) into parts (or semi-finished products) during cold stamping. It is called a cold stamping die (commonly known as a cold stamping die). Stamping is a pressure processing method that uses a mold installed on a press to apply pressure to the material at room temperature to cause it to separate or plastically deform, thereby obtaining the desired parts.

Stamping dies are essential process equipment for stamping production and are technology-intensive products. The quality, production efficiency and production cost of stamping parts are directly related to mold design and manufacturing. The level of mold design and manufacturing technology is one of the important indicators to measure the level of a country's product manufacturing, and to a large extent determines the product quality, efficiency and new product development capabilities.

Classification

There are many forms of stamping dies, and stamping dies are also classified according to the nature of the work, die structure, and die material.

Classification by process properties

a. A blanking die is a die that separates materials along a closed or open contour. Such as blanking dies, punching dies, cutting dies, notching dies, trimming dies, cutting dies, etc.

b. Bending die is a die that bends a sheet metal blank or other blank along a straight line (bending line) to obtain a workpiece with a certain angle and shape.

c. The drawing die is a die that makes a sheet metal blank into an open hollow part, or further changes the shape and size of the hollow part.

d. The forming die is a die that directly replicates the shape of the blank or semi-finished workpiece according to the convex and concave shapes of the drawing, while the material itself only produces local plastic deformation. Such as bulging die, shrinking die, expanding die, undulating forming die, flanging die, shaping die, etc.

e. The riveting mold uses external force to connect or overlap the participating parts in a certain order and way to form a whole

Classification according to the degree of process combination

a. Single-process mold: A mold that only completes one stamping process in one stroke of the press.

b. The compound die has only one station and can complete two or more stamping processes at the same station during one stroke of the press.

c. Progressive die (also called continuous die) has two or more workstations in the feeding direction of the blank. In one stroke of the press, the die completes two or more stamping processes in succession at different workstations.

d. The transfer mold combines the characteristics of the single-process mold and the progressive mold, and uses the robot transfer system to achieve rapid transfer of the product in the mold, which can greatly improve the production efficiency of the product, reduce the production cost of the product, save material costs, and have stable and reliable quality.
Classification by product processing method

Depending on the product processing method, molds can be divided into five categories: punching and shearing molds, bending molds, drawing molds, forming molds and compression molds.

a. Punching and shearing dies: They complete their work by shearing action. Commonly used forms include shearing dies, blanking dies, punching dies, trimming dies, edge straightening dies, hole pulling dies and punching dies.

b. Bending die: It is used to bend the flat blank into an angled shape. Depending on the shape, precision and production volume of the parts, there are many different types of molds, such as ordinary bending dies, cam bending dies, curling dies, arc bending dies, bending and seam punching dies and twisting dies.

c. Drawing mold: The drawing mold is used to make a flat blank into a seamless container with a bottom.

d. Forming die: refers to the use of various local deformation methods to change the shape of the blank, which include convex forming die, curling forming die, necking forming die, hole flange forming die, and round edge forming die.

e. Compression die: It uses strong pressure to make the metal blank flow and deform into the desired shape. Its types include extrusion die, embossing die, stamping die, and end pressure die.

Basic knowledge of stamping die terminology　

1. Curling

Curling is a stamping process that rolls the edge of the workpiece into a nearly closed circle. The axis of the curling circle is straight.

2. Roll edge

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

3. Drawing

Drawing is a stamping process that transforms straight raw materials or workpieces into curved surfaces. The curved surface is mainly formed by the extension of the material at the bottom of the punch.

4. Pull and bend

Stretch bending is a stamping process that achieves bending deformation under the combined action of tension and bending moment, so that the entire bent cross-section is subjected to tensile stress.

5. Bulging

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

6. Leveling

Leveling is a stamping process that improves the flatness of local or overall flat parts. Undulating Forming

7. Fluctuation forming

Recessed forming is a stamping process that relies on the extension of the material to form local depressions or protrusions on the workpiece. The change in material thickness during undulation forming is unintentional, that is, a small change in thickness is naturally formed during the deformation process and is not a design requirement.

8. Bend

Bending is a stamping process that uses pressure to cause plastic deformation of the material, thereby bending it into a shape with a certain curvature and angle.

9. Chiseling

Chiseling is a blanking or punching process using a sharp-edged chiseling die. There is no lower die for chiseling, and there is only a flat plate under the material. Most of the punched materials are non-metallic.

10. Deep hole punching

Deep hole punching is a punching process when the hole diameter is equal to or less than the thickness of the material being punched.

11. Blanking

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

12. Shrinkage

Shrinking is a stamping process that applies pressure to the open end of a hollow or tubular part to shrink it.

13. Plastic surgery

Shaping is a stamping process that relies on material flow to slightly change the shape and size of the workpiece to ensure the accuracy of the workpiece.

14. Renovation

Trimming is a stamping process that removes a small amount of material along an outer or inner contour to improve edge finish and squareness. The refurbishment process generally also improves dimensional accuracy.

15. Hole turning

Flanging is a stamping process that turns the material around the inner hole into a side flange.

16. Flanging

Flanging is a stamping process that turns the material around the outer curve to form a short side.

17. Deep drawing

Drawing is a stamping process that transforms a flat material or workpiece into a hollow part, or further changes the shape and size of a hollow part. During deep drawing, the hollow part is mainly formed by the material outside the bottom of the punch flowing into the die.

18. Continuous drawing

Continuous drawing is a stamping method that uses the same die (continuous drawing die) to gradually form the desired shape and size through multiple drawing on strips (coils).

19. Thinning and drawing

Thinning and drawing is a drawing process that further changes the shape and size of hollow parts and intentionally thins the side walls.

20. Reverse drawing

Reverse drawing is a drawing process in which the inner wall of a hollow part is turned outward.

21. Differential temperature drawing

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

22. Hydraulic drawing

Hydraulic drawing is a drawing process that uses liquid contained in a rigid or flexible container to replace the punch or die to form a hollow part.

23. Pressing

Compression welding is a type of undulating forming. When the local undulation appears in the form of ribs, the corresponding undulation forming process is called rib pressing.

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