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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