DEVICE TO MANUFACTURE PIPES WITH INTERNAL SPIRAL RIBS Russian patent published in 2015 - IPC B21C37/20 

FIELD: machine building.

SUBSTANCE: device includes a container with located in it blank, press-washer, die, press-needle made on work area with helical cavities and shoulders, and connected with drive gear ensuring press-needle rotation with speed corresponding to the pressing rate. Stable spiral flow of the blank metal in the deformation area, and reduced press force are ensured due to that die is made with lead taper and calibrating areas, at the work area of the press-needle adjacent to the press-needle body and corresponding to length of the lead area of the die the spiral cavities are made with varying pitch, at that width and depth of each cavity reduce towards the calibrating area of the die, and ratio width to depth of the cavity is permanent value for all cross-sections. Cavities pitch over the work area of the press-needle corresponding to length of the lead area of the die is determined by equation.

EFFECT: improved design.

2 cl, 3 dwg