METHOD OF PRODUCTION OF PRECISION PIPES Russian patent published in 2008 - IPC B21C1/00 

FIELD: technological processes.

SUBSTANCE: method is intended for production of precision capillary pipes by drawing. In method that includes drawing of tubular billet in holder billet is alternately subjected to rolling and holder-free drawing with reduction ration of 7.0-10.0, after that tubular billet is subjected to holder-free drawing, in at least two stages with reduction ratio of 1.4-3.0, then drawing is carried out on the long holder with reduction ratio of 1.2-2.4, then the pipe with holder is treated with rolling bodies, and then holder-free drawing of pipe is performed with reduction ratio of 1.2-1.7.

EFFECT: high accuracy and stability of pipe dimensions by diameter and wall thickness; high quality of surface and increase of proper product output.

1 tbl