METHOD FOR PRODUCTION OF PIPES WITH PROFILED TIPS Russian patent published in 2010 - IPC B21D51/10 B21D53/08 

FIELD: technological processes.

SUBSTANCE: invention is related to the field of metal plastic working by pressure, in particular to processes of production of heat exchange pipes with profiled tips produced with application of effect from localised directed plastic deformation of pipe material. Method includes straightening, cutting as per measure, cleaning of external surface of pipe ends. Then expanding- calibration of pipe end is carried out by means of rigid puncheon. Radial clamping within the limits of calibrated section length part is carried out with provision of cylindrical section of crippling. Annular ledge is formed in two stages by preliminary and final filling of matrix finishing gravure volume with pipe material. End of pipe is installed in cavity of split matrix by external conical section opposite to finishing gravure of matrix. Split matrix comprises finishing gravure in the form of annular groove of trapezoid cross section and preliminary gravure in the form of annular groove. Further shaping of annular ledge is carried out by means of burnishing.

EFFECT: invention provides for production of heat exchange pipes with profiled tips that do not depend on geometrical dimensions of pipe in transverse direction and grades of processed materials.

3 cl, 9 dwg