TUBE DRAWING METHOD Russian patent published in 1994 - IPC

FIELD: metal pressure forming. SUBSTANCE: method comprises steps of drawing a tubular blank through two drawing dies; an annular die and a roller die, successively mounted on a fixed mandrel; performing reduction for providing an outer final diameter in the first drawing die; performing reduction of tube walls in the drawing die on a mandrel with inverse conicity for providing a dimension, equal to the wall thickness of the tube. EFFECT: increased one - operation deformation of the blank, enhanced efficiency. 1 cl, 1 dwg