Pièces d'estampage

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What are stamping parts?

stamping parts are metal parts manufactured through a stamping process, using dies and presses to shear, bend, and stretch sheet metal (such as steel, aluminum, or copper) to form the desired shape. The core characteristics of this process are high efficiency and precision. Stamping can be categorized into two main types: separation processes (such as punching and blanking) and forming processes (such as drawing and flanging), to meet different structural requirements.

What are the main characteristics of stamping parts?

1. Compared to casting and forging, stamping parts are thinner, more uniform, lighter, and stronger. Stamping can produce workpieces with ribs, ribs, corrugations, or flanging that are difficult to create using other methods to increase rigidity.

2. Due to the use of dies, workpiece precision can reach micron levels, with high repeatability and consistent specifications, including punched holes and bosses. Cold stamped parts generally require no or minimal cutting.

3. The precision and surface finish of hot stamped parts are lower than those of cold stamped parts, but still superior to those of castings and forgings, requiring less cutting. 4. Using composite dies, particularly multi-station progressive dies, allows multiple stamping steps to be completed on a single press, achieving automated production from strip uncoiling, leveling, blanking, to forming and finishing.

5. High production efficiency, good working conditions, and low production costs enable the production of hundreds of pieces per minute. Stamping is primarily categorized by process into separating and forming.

6. The surface and internal properties of the stamped sheet material significantly impact the quality of the stamped product, requiring consistent thickness and uniformity of the stamped material.

7. The surface must be smooth, free of scars, scratches, or surface cracks, with uniform yield strength and no apparent directional variation; high uniform elongation; low yield strength; and low work hardening.

Metal Stamping Design Process

Metal stamping is a complex process that may include numerous metal forming steps—blank-cutting, punching, bending, and piercing, among others. Blanking: This process involves cutting the rough outline or shape of the product. This stage is focused on minimizing and avoiding burrs, which increase part cost and extend delivery time. This step is where you determine the hole diameter, geometry/taper, edge-to-hole spacing, and insert the first punch.

Bends: When designing bends in stamped metal parts, it's important to leave enough material—make sure to design your part and its blank so there's enough material to make the bend. Some important factors to keep in mind:

If the bend is too close to the hole, it may deform.

Notches, tabs, and notches should be designed with a width of at least 1.5 times the material thickness. Any smaller and they may become difficult to manufacture due to the forces exerted on the punch, causing them to break.

Each corner in the blank design should have a radius of at least half the material thickness.

To minimize the occurrence and severity of burrs, avoid sharp corners and complex cuts whenever possible. When these factors cannot be avoided, be sure to note the burr direction in the design so that it can be accounted for during stamping.

Coining: This action involves striking the edge of a stamped metal part to flatten or break burrs. This creates a smoother edge in the coined area of the part geometry. It can also add additional strength to localized areas of the part, which can avoid secondary operations such as deburring and grinding.