Open AccessPipes production by hot reducing at SKK-14 radial-forging machine
Author(s) -
S. I. Zakarlyukin,
G. I. Koval
Publication year - 2019
Publication title -
černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj i èkonomičeskoj informacii/černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj informacii
Language(s) - English
Resource type - Journals
eISSN - 2619-0753
pISSN - 0135-5910
DOI - 10.32339/0135-5910-2019-2-242-246
Subject(s) - forging , materials science , work (physics) , composite material , metallurgy , mechanical engineering , engineering
At small-capacity production of pipes a process of pipes reducing at radial-forging machines can be effective for expanding of pipes assortment by diameter and wall thickness. Results of pilot work on hot reducing at radial-forging machine SKK14 of pipes, made of corrosion-resistant steels 12Х18Н10Т and 10Х23Н18. Based on analyses of known recommendations on pipes forming during reducing by longitudinal rolling at reducing mills, as well as at radial-forging and rotary-forging machines, it was recommended to use a known dependence Sр = S0/[1 – 0,0044(D0 – Dр)], usually applied for pipes rolling conditions at reducing mills, for predicting of reduced pipe wall thickening. To determine the pipes internal surface quality, a hot reducing of pipes made of 12Х18Н10Т steel was accomplished using different technological routes and taking into consideration a possibility of forming folds and laps on the surface. It was established that longitudinal folds (wrinkles) are not formed on the pipe internal surface at the pipe outer diameter decreasing by less than 30%, while the longitudinal folds (wrinkles) are formed at decreasing of the pipe outer diameter by more than 45%. Forging folds can be formed on the pipe internal surface at pipe outer diameter decreasing by more than 60%.