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(a) Surface plot for the effect of maximum cushion thickness and cut-out base radius on sheet metal thickness variation; (b) surface plot for the effect of maximum cushion thickness and cut-out profile radius on sheet metal thickness variation; (c) section thickness contour on the upper workpiece surface when using a cut-out base radius of 2.37 mm; (d) section thickness contour on the upper workpiece surface when using a cut-out base radius of 5.13 mm.
