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

1991-06-14

1991-12-31

Spruill, Robert L.

Metal deforming

With cleaning, descaling, or lubrication of work or product

Lubricating

72283, B21B 4502, B21C 124

Patent

active

050760840

ABSTRACT:
A method of manufacturing a long tube having a small diameter, such as a tube for use in a heat exchanger, by cold working. A plug drawing using a pressurized lubricating oil of 500 kgf/cm.sup.2 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, subsequent free-loaded drawing can be conducted.

REFERENCES:
patent: 1076545 (1913-10-01), Blaxter
patent: 3798943 (1974-03-01), Benteler et al.

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