Stamping relies on a press and die to apply external force to sheet, strip, tube, or profile material, causing plastic deformation or separation to achieve the required shape and dimensions. In daily mold engineering work, four major operations dominate: blanking, bending, deep drawing, and forming. Blanking handles separation, bending changes angles, deep drawing turns flat sheet into three-dimensional parts, and forming creates local plastic deformation. Every step depends on the coordination of die clearance, cutting edge radius, and material properties. For example, blanking clearance is typically set at 5% to 10% of material thickness. Too large a clearance produces heavy burrs; too small accelerates die wear. These details directly determine whether the stamped part performs well in assembly.

From a tooling perspective, the die structure must match the operation. Blanking dies need robust punch and die inserts with proper shear angles to reduce stripping force. Bending dies require careful springback compensation—especially for high-strength steel where springback can exceed 10 degrees. Deep drawing dies demand smooth radii on the draw ring and punch, plus adequate blank holder force to prevent wrinkling. Forming dies often incorporate local relief features to control material flow. Material selection for the die itself matters just as much: Cr12MoV or SKD11 for high-volume blanking, and carbide inserts for abrasive materials. Heat treatment hardness usually falls between HRC 58 and 62 for cutting edges, balancing wear resistance and toughness.

In real production, we always start with a strip layout and clearance calculation, then verify with tryout. A 0.5mm clearance error on a 1.2mm thick cold-rolled steel sheet can mean the difference between a clean cut and a secondary deburring operation. For mold sourcing and more technical resources on stamping dies, visit MoldWorld at www.moldw.com.