Progressive Die Design Guide
Progressive dies perform multiple stamping operations — blanking, piercing, forming, and cutoff — across sequential stations as the metal strip advances. This guide covers the core principles for designing reliable, long-lasting progressive dies.
Strip Layout Fundamentals
The strip layout determines material utilization, station count, and scrap percentage. Optimal nesting achieves 65-80% material utilization.
| Parameter | Recommended Value | Notes |
|---|---|---|
| Carrier strip width | 2-3× material thickness | Wider for heavier gauges |
| Pilot hole diameter | 1.5-3× material thickness | Minimum 2mm |
| Station pitch | 20-50mm | Based on press stroke |
| Bridge width | 1.2-2× material thickness | Min 1.5mm |
Die Material Selection
- D2: Good wear resistance for medium volumes (100K-1M parts)
- A2: Toughness and stability. Good for punches and dies.
- M2: Excellent wear resistance for high-volume (>1M parts)
- Carbide inserts: For extreme wear in very high-volume (10M+ parts)
Springback Compensation
Springback is the elastic recovery of metal after forming. Compensate by over-bending 2-5°, coining at the bend line, or using stress relief notches. For high-strength steels (HSS), springback can reach 5-15°.
Common Progressive Die Operations
- Piercing/Blanking — Cut holes and perimeter. Typically first 3-4 stations.
- Drawing — Create 3D features. Requires multiple stations for deep draws.
- Bending/Forming — Bend material to 3D geometry. Springback compensation critical.
- Parting/Cutoff — Separate part from carrier strip. Last operation.
- Coining — Compress material for flatness or embossed features.
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