METHOD TO PRODUCE BENT SHAPES OF ROLLED PIECES Russian patent published in 1995 - IPC

FIELD: metals thrust working. SUBSTANCE: first, corrugation is formed by rollers from pattern blank. Width of corrugation development is changing along its length. Part of corrugation with maximum width of development is located on the side of maximum width of blank. In the case, difference between maximum and minimum values of width of ready shape wall is equal to difference between maximum width of development of corrugation cross-section and chord in plane of shape wall. Then seats of corrugation are bent to given values and corrugation is once more formed as flat wall by vertically directed thrust. Simultaneously with corrugation reforming, transverse directed stretching efforts are applied to it and so transverse shift of one of corrugation seats is prevented. EFFECT: increase of shapes quality. # cl, 14 dwg