Stamping is fundamentally a high-speed deformation process where sheet metal is forced into a desired shape using a press and tooling. The forming principle relies on controlled plastic deformation—when the material’s yield strength is exceeded but below its tensile strength, it flows into the die cavity. Key parameters include blank holder force (typically 20–30% of the punch force for mild steel), punch-die clearance (usually 5–10% of material thickness per side), and lubrication type (chlorinated or water-soluble for aluminum). For a 1.5 mm thick DC01 sheet, a typical drawing operation requires a punch speed of 15–25 m/min and a blank holder pressure of 2–3 MPa to prevent wrinkling. Understanding these numbers is critical—too little force causes springback, too much causes tearing at the die radius.

From a die construction standpoint, the stamping process splits into blanking, bending, drawing, and forming—each with distinct tooling demands. Blanking dies use a shear angle of 0.5–1° on the punch to reduce impact load and extend die life, while drawing dies require a radius of 4–6 times the sheet thickness on the die entry to avoid stress concentration. For high-volume production (over 500,000 strokes), consider using D2 or M2 tool steel with a hardness of 58–62 HRC, paired with a TiN coating to reduce galling. In practice, the most common failure is die wear at the bend line—adding a relief groove of 0.2–0.3 mm depth can extend tool life by 30%. Also, always design for material springback: for a 90° bend in 2 mm thick 304 stainless, expect a 2–3° angular recovery, so overbend the punch accordingly.

In real shop-floor conditions, process stability depends on consistent material properties and press alignment. Use a straight-side press with a minimum rigidity of 1.5 times the required tonnage—for a 200-ton job, that means a 300-ton frame. Monitor the press tonnage curve with a load cell; a sudden spike indicates die wear or misalignment. For progressive dies, maintain a pitch accuracy of ±0.01 mm and use pilot pins with a 6–8 mm diameter for guidance. If you are sourcing new stamping dies or need to optimize an existing line, visiting MoldWorld (www.moldw.com) gives you access to verified toolmakers, material suppliers, and technical datasheets—worth a look before you commit to a tooling vendor.