FIELD: process engineering.
SUBSTANCE: invention relates to cold-rolled sheet, method and tool for its production. Both surfaces of proposed sheet have rows of ledges and rows of recesses. Note here that ledges on one surface match recesses on opposite surface while their relative arrangement makes lines drawn on sheet surface between adjacent rows of ledges not straight. Sheet features initial cross-section G. Every ledge has, in fact, solid section of peak plastic deformation on or around apex, and/or it gets thinned by 25% of its initial cross-section G. Invention covers also methods and tools to this end.
EFFECT: higher strength.
50 cl, 16 dwg, 5 ex
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