METHOD FOR MAKING ZIGZAG CORRUGATION (VARIANTS) Russian patent published in 1997 - IPC

FIELD: plastic metal working, namely methods and apparatuses for corrugating sheet materials used in aircraft construction, ship building, at making building struсtures. SUBSTANCE: method comprises steps of feeding blank to corrugating zone, clamping it and shaping. Shaping of zigzag corrugation is realized by bending initial blank in the form of corrugated material. Recesses and protrusions of zigzag corrugation are formed respectively on protrusions and recesses of blank relief whose length is equal to step of zigzag corrugation at simultaneous formation of zigzag bent lines along apices of protrusions and recesses. Cross section of shaped portion is identical to that of initial blank. Method allows to make zigzag corrugation with portions of mirror-symmetry relief along saw-tooth lines. In order to realize it, linear corrugation with portions of shaped zigzag corrugation is turned by 180 degrees in horizontal plane. Then protrusions and recesses symmetrical relative to those shaped beforehand are made respectively on recesses and protrusions of relief of unshaped portion. EFFECT: enhanced quality of zigzag corrugation due to making it by bending that is without distortion of material structure. 3 cl, 6 dwg