METHOD FOR MAKING HIGH RIGIDITY SHAPES Russian patent published in 2001 - IPC

FIELD: plastic metal working, possibly manufacture of cold bent high rigidity shapes. SUBSTANCE: method comprises steps of forming on strip blank closed lengthwise corrugations in shaping stand at applying front and rear tension and trimming side edges; applying front tension to strip at elastically clamping it before trimming edges by means of rolls of double-roll stand whose lower roll has flat barrel and upper roll has grooves for passing corrugations. EFFECT: enhanced quality of high-rigidity shapes due to predetermined width of clamping strips, prevention of defects of strip geometry and cracking of strip without damaging strip surface.