Open Access
Table 1.
Conditions of punching process of ultra- high strength steel sheet.
| Taper angle of punch θ | 10°, 13° and 20° |
| Step height of die h | 0.5, 0.7, 0.9 and 1.1 mm |
| Punch | SKD11, VC coating |
| Die | SKD11, no coating |
| Punching speed | 0.08 mm/s |
| Lubrication | Rust prevention oil |
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