Table 2.

Selected amplitude 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	Sa (μm)	Sq (μm)	Ssk	Sku	Sp (μm)	Sv (μm)	Sz (μm)
original surface	1.32	1.54	−0.13	2.11	10.5	10.3	20.80
A	1.38	1.65	0.20	2.32	5.25	10.2	15.41
B	1.33	1.55	−0.07	2.03	4.35	6.2	10.55