METHOD FOR MANUFACTURING SHELLS OF VARIABLE CROSS-SECTION Russian patent published in 2022 - IPC B21K21/08 B21C37/20 

FIELD: metal processing.

SUBSTANCE: invention relates to the processing of metals by pressure and can be used in the manufacture of shells. The workpiece is obtained by cutting the pipe and forming a ledge on its inner surface. Then, on a pressure-rolling machine, when installing the workpiece up to the stop with a ledge into the mandrel, rolling is performed in one or more passes, recrystallization softening annealing and phosphating. Further, when installing the workpiece in the press device, riffles are formed on one part of the workpiece, then the HFC annealing of the part of the workpiece without riffles, phosphating and calibration are performed. After that, the workpiece is crimped with the accompanying operations of HFC annealing, annealing, reducing stress, and phosphating. Rolling, pressing, calibration and crimping are performed with a deforming tool with an antifriction composition applied to its working surfaces, and a fluorine-containing lubricant emulsion is applied to the working surfaces of the deforming tool and the outer surface of the workpiece.

EFFECT: shells with high accuracy of geometric dimensions and the quality of the treated surfaces are obtained.

9 cl, 7 dwg, 1 ex