METHOD FOR MAKING NON-SYMMETRICAL HIGH-RIGIDITY SECTIONS Russian patent published in 2000 - IPC

FIELD: rolled stock production, possibly manufacture of bent section from sheet blank with periodic closed rigidity corrugations. SUBSTANCE: method comprises steps of cutting both edges of strip, forming on mean (along its width) portion of strip two corrugations with flat intermediate portion between them. Width of intermediate portion consists 90-150 thickness values of strip. Then strip is cut in middle of intermediate portion for making two non-symmetrical strip sections. Said sections are subjected to cutting by measure lengths. EFFECT: enhanced quality of corrugations, reduced metal consumption. 1 ex