FIELD: plastic metal working, ferrous metallurgy, transport, tractor and agricultural machine engineering. SUBSTANCE: at least one prefinal technological transition flanges and lateral webs of shape are subjected to free bending and simultaneously additional efforts for bending up lateral webs is applied to bending zones between flanges and lateral webs in direction parallel with shaping plane and passing through centers of said bending zones. EFFECT: enhanced quality of closed and semiclosed bent shapes. 2 dwg
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