METHOD OF MAKING CORRUGATED SHEETS Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely production of cold bent sheet rolled sections. SUBSTANCE: method comprises steps of successive pass-to-pass formation of corrugations beginning from mean portion of sheet until engagement of said sheet with rolls by its whole width in last pass. Edge portions of sheet in all passes except two last are free from contact with upper rolls. Central large-size corrugation is free from contact with both rolls after it is finally shaped. Small-size trapezoidal corrugations adjacent with said large corrugation are shaped simultaneously with formation of steps near base of said large corrugation, then small-size trapezoidal corrugations are successively reshaped to semicircular ones. EFFECT: enlarged manufacturing possibilities of shaping process with the same high quality of corrugated sheets having different size and contour corrugations and made of chrome-nickel-titanium steel. 1 dwg