In daily stamping work, the first thing to settle is the operation type—blanking, bending, drawing, or forming—because each one dictates the die structure, press tonnage, and material utilization. Blanking is the most straightforward: the punch and die shear the sheet along a closed contour, and the critical clearance typically sits between 5% and 10% of material thickness for mild steel, while stainless requires a bit more, around 8% to 12%. Bending, on the other hand, introduces springback compensation, and the bend radius should never be less than 0.5 times the stock thickness to avoid cracking. For drawing operations, the blank holder force and draw ratio become the real constraints—if the draw ratio exceeds 1.8 for a cylindrical cup, you are looking at a multi-stage process, which immediately raises tooling cost and cycle time.

From a die design standpoint, the key points are not just geometry but also the strip layout and piloting strategy. A progressive die with a proper carrier strip needs a minimum pitch of 1.2 times the part width, and pilot holes should be placed in the scrap area whenever possible to save material. The cutting force calculation follows the simple formula F = L × t × τ, where L is the cutting perimeter in mm, t is thickness, and τ is the shear strength—for SPCC that is roughly 300 MPa, so a 2 mm thick part with a 500 mm perimeter will need about 300 kN of press capacity. Do not forget to add a 20% safety margin for die wear and uneven material thickness. Also, for bending dies, the punch radius should be matched to the inner bend radius, and the die opening width is typically 8 to 12 times the material thickness to ensure a stable bend line.

When quoting a stamping job, the real cost drivers are tooling complexity, material grade, and secondary operations. A simple blanking die with a single station might run 3,000 to 8,000 USD, while a progressive die with five or more stations easily crosses 20,000 USD. Material utilization is another silent killer—if your nesting efficiency drops below 70%, the part cost jumps noticeably. Also, think about burr direction and surface finish requirements; these often force an additional deburring or tumbling step that eats into margins. Keep your die maintenance schedule realistic—after every 50,000 strokes, expect to regrind the cutting edges. For more detailed stamping process guides, die design checklists, and sourcing benchmarks, visit MoldWorld (www.moldw.com) where you can compare mold suppliers and get practical quoting data from real shops.