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Selected feature parameters of surface roughness of the specimen: width 20 mm; drawbead height h = 18 mm; Ra of rollers 0.63 μm; machine oil lubrication.
| Source of Measurement | Spd (1/mm2) | Spc (1/mm) | Sda (mm2) | Sha (mm2) | Sdv (μm3) | Shv (μm3) |
|---|---|---|---|---|---|---|
| original surface | 54.33 | 77.3 | 0.019 | 0.019 | 4795 | 3790 |
| A | 106.4 | 78.4 | 0.010 | 0.009 | 1923 | 1389 |
| B | 207.6 | 91.5 | 0.005 | 0.005 | 440 | 339 |
