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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