APPARATUS FOR PRODUCING CORRUGATIONS ON THE OUTER SURFACE OF A CYLINDRICAL SHELL Russian patent published in 2022 - IPC B21C37/20 B21H7/18 B24B39/04 B21D17/00 

FIELD: shaping.

SUBSTANCE: invention relates to an apparatus for producing corrugations on the outer surface of a cylindrical shell. Apparatus comprises a lower plate, pushers, an upper plate with a die installed thereon, and a hollow elastic working mandrel with a longitudinal cut and a flange, with protrusions of the height h for applying corrugations made on the inner surface of said mandrel. The die has a working hole for compressing the working mandrel. A punch, pushers, and a cover are installed on the lower plate. The inner cavity of the hollow elastic working mandrel is made with a diameter D_ro=D_z+2(Z+h), wherein D_z is the outer diameter of the cylindrical shell, Z is the gap between the top of the protrusion of the hollow elastic working mandrel and the cylindrical shell. The longitudinal cut of the working mandrel has a width δ=2π(Z+h). The working hole of the die has a diameter D_m=D_z+2t, wherein t is the thickness of the wall of the working mandrel. The diameter of the entrance part of the working hole of the die is not less than the diameter of the inner cavity of the working mandrel D_ro.

EFFECT: higher accuracy of producing corrugations.

1 cl, 6 dwg