METHOD FOR THE MANUFACTURE OF SHAPED SHEATHS Russian patent published in 2023 - IPC B21D22/16 B21D51/16 

FIELD: metal processing.

SUBSTANCE: manufacture of shaped sheaths. The pipe billet is mounted on a mandrel with a working surface having cylindrical and shaped sections. The billet is fixed on the cylindrical section of the mandrel and is rolled by deforming rollers. A fluorine-containing surfactant is applied to the working surfaces of the rollers. Use a roller with a large working surface profile radius and subsequent rollers with a smaller working surface profile radius, which decreases from roller to roller. The rollers are installed with radial and axial displacements and with gaps between their tops and the mandrel. The size of the gaps increases from the beginning to the end of rolling and decreases from a deforming roller with a large radius of the working surface to rollers with smaller radii. When rolling, lubricant and coolant are used in the form of a fluorine-containing lubricating emulsion in industrial oil.

EFFECT: obtaining shaped sheaths with high dimensional accuracy, high quality of the machined surface, and increasing the durability of the deforming tool.

1 cl, 7 cl, 3 dwg