Stamping is essentially a controlled contest between a press and a die: force is applied to sheet, strip, tube or profile stock so the material either separates cleanly or deforms predictably into the required shape and size. In the shop you will hear it split into "punch, shear, fold, bend and draw," but from a tooling standpoint there are only two jobs—make the material separate on command, or make it flow on command. When I review a stamping animation, I am not watching the motion; I am watching punch-die clearance, cutting force and material flow direction. Clearance is the first number to lock down: too tight and you accelerate punch wear and risk galling; too loose and you get heavy burrs and a poor fracture zone. For blanking and piercing, cutting force scales with sheet thickness and material shear strength, so tonnage checks belong in the die design review, not after the die is built.
Bending and drawing bring different failure modes onto the toolroom floor. In bending, the punch radius, die opening and springback compensation decide whether the flange lands on nominal angle; in drawing, blank-holder force and draw radius control whether the material flows or tears. Lubrication, surface finish on the working faces, and even the relief ground into the punch all show up in the finished part. A die that cuts well but cannot control material flow will still scrap parts, so we treat strip layout, blank-holder pressure and ejection as one system rather than separate details.
Practically, that means validating clearance and tonnage at the design stage, then confirming burr height, angle and wall thickness on the first-off samples before committing to production. Keep a clearance log per station and record regrind history—it pays back when troubleshooting shifts from "the die is bad" to "station four lost 0.02 mm of clearance." For more mold and stamping sourcing information, visit MoldSo at www.moldso.com.