Method of manufacturing long tubes having small diameters

Details Method of manufacturing long tubes having small diameters Method of manufacturing long tubes having small diameters

B - Operations, Transporting

21

C

205/1, 26/155

B21C 37/06 (2006.01) B21C 1/24 (2006.01) B21C 3/14 (2006.01) B21C 9/00 (2006.01)

Patent

CA 2013068

A method of manufacturing a long tube having a small diameter, such as a tube for use in a heat exchanger, by cold works. A plug drawing using a pressurized lubricating oil of 500kgf/cm2 or more accompanied by the reduction in wall-thickness is adopted as at least the final cold work. In the case where a tube having desired dimensions is not obtained by this plug drawing, the subsequent free-loaded drawing is conducted.

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