In stamping, every job boils down to two major categories: separation and forming. Separation covers shearing, blanking, and punching—where the material is cut along a contour. Forming covers bending, drawing, and flanging—where the material plastically deforms without fracture. For mold design and quoting, this distinction matters. A blanking die needs tight punch-die clearance control (typically 5–10% of sheet thickness) and high wear resistance, while a drawing die demands proper draw radii, blank holder force, and surface finish to prevent tearing. If you quote a separation job using forming assumptions, you'll either overprice or lose money on rework.

The three core operations—blanking, bending, and drawing—each carry their own tooling cost drivers. Blanking: die insert material (SKD-11 or carbide), stripper plate design, and scrap removal add cost. Bending: springback compensation often requires angled punches or adjustable dies, and bend radius must stay above the material's minimum (typically 0.5–1× thickness for mild steel). Drawing: the draw ratio (blank diameter to cup diameter) limits how deep you can go in one pass; exceeding it means multiple dies, annealing steps, or both. A 0.8mm cold-rolled steel bracket with a 30mm draw depth, for example, may need two draws plus an intermediate anneal—that's three die sets, not one.

In practice, always confirm the operation type before quoting. Ask for the part drawing, material grade, thickness, and annual volume. Then map each feature to separation or forming, count the stations, and estimate die life. A 200-ton press with a progressive die running 500,000 shots per year will wear differently than a low-volume hydraulic setup. Get these details right, and your quotes hold up. For more mold sourcing and technical resources, visit MoldWorld at www.moldw.com.