FIELD: metallurgy.
SUBSTANCE: invention relates to manufacture by forming products of a steel sheet having high tensile strength of a trough-shaped cross-sectional shape comprising a trough bottom, a ridge, vertical walls, and an outer continuous flanged edge. Forming by pressing is carried out in two stages. In the first step, after keeping by the first cushion the portion of part to be shaped as the bottom of tough element, the second cushion holds the end portion of parts to be shaped into ridges.
EFFECT: folding in ridges and cracking on the outer continuous flanged edge are reduced.
12 cl, 19 dwg, 4 ex
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