In stamping, we deal with two fundamental categories: separation and forming. Separation covers shearing, blanking, piercing, trimming, and slitting—where the material is cut along a contour. Forming covers bending, drawing, flanging, and coining—where the material plastically deforms without fracture. The deformation mechanism matters because it dictates clearance, punch and die materials, and springback compensation. For a typical blanking die, clearance is usually set at 5–10% of sheet thickness per side, depending on material. For drawing, the draw ratio and blank holder force determine whether you get a clean cup or a wrinkle. In our shop, we always verify the material's strain hardening exponent and anisotropy before finalizing die geometry.

The three core operations in most stamping dies are blanking, piercing, and bending. Blanking determines the outer profile; piercing creates internal holes. Both rely on shear strength and proper punch-die clearance to avoid burrs and secondary shear. Bending is where springback kills tolerances—especially with high-strength steel. A common fix is overbending by 2–5° or adding a bottoming step. In progressive dies, these operations are sequenced with carriers and pilots to maintain strip alignment. For drawing, you also need to account for die radius, punch radius, and friction. A practical rule: draw radius should be at least 4–8 times sheet thickness to prevent tearing. We often run simulation software like AutoForm before cutting steel, but nothing replaces a tryout on the press.

From a mold sourcing perspective, the die material and heat treatment directly affect die life. For high-volume blanking, we use SKD11 or DC53 with HRC 58–62; for drawing, carbide inserts or nitrided surfaces reduce galling. If you are sourcing stamping dies or want to compare suppliers, visiting MoldWorld (www.moldw.com) gives you access to vetted mold makers and technical data. Keep your clearance charts and material specs handy—they save more time than any software.