Fine Blanking Guide
Fine blanking produces parts with 100% smooth sheared edges — no die break. Tolerances of ±0.01mm and edge flatness suitable for functional surfaces without secondary operations.
| Feature | Conventional Stamping | Fine Blanking |
|---|---|---|
| Shear surface ratio | 30-50% | 95-100% |
| Burr height | 0.05-0.15mm | <0.02mm |
| Punch-to-die clearance | 5-10% per side | 0.5-1% per side |
| Cycle speed | 100-200 spm | 15-40 spm |
The Fine Blanking Process
Fine blanking requires a triple-action press providing three forces simultaneously: V-ring impingement (clamps material around cut perimeter), cutting force (punch advances through clamped material), and counter-force (maintains flatness and controls rollover).
Material Suitability
- Low-carbon steel: Excellent — 85% of applications
- HSLA and stainless: Good, but 20-30% higher tonnage required
- Aluminum and copper: Very good, minimal tool wear
- Thick materials (6-16mm): Viable where conventional stamping fails
- Not recommended: Very hard (>40 HRC) or brittle materials
Minimum Feature Sizes
| Feature | Minimum Size |
|---|---|
| Hole diameter | 0.6× material thickness (min 0.5mm) |
| Slot width | 0.8× material thickness (min 0.6mm) |
| Edge to hole distance | 0.8× material thickness |
| Outside corner radius | 0.2× material thickness |
Applications
Fine blanking is preferred when edges function as working surfaces (gears, ratchets, cams), secondary finishing would be too costly, or thick plates (3-16mm) need precision features.
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