TITLE:
Simulation of Torque during Rod Rolling of HC SS316 at Low Strain Rate Using “Phantom-Roll” Method
AUTHORS:
P. O. Aiyedun, O. S. Igbudu, B.O. Bolaji
KEYWORDS:
simulation, rod rolling, grooved, phantom roll method, torque.
JOURNAL NAME:
Journal of Minerals and Materials Characterization and Engineering,
Vol.10 No.15,
December
20,
2011
ABSTRACT: Rolling torque for a seventeen passes, 125 x 125 mm HC SS316 billets rolled to a 16 mm
diameter rod have been simulated. Torque calculations based on pressure exerted by the
metal on the rolls and the area of contact during longitudinal rolling were obtained using the
temperature values derived using the “Phantom Roll” method. Investigations were carried
out for four different starting mean rolling temperatures between 988℃ and 1191℃ and at
four different strain rates of 0.4s-1, 0.8s-1, 1.2 s-1 and 1.6s-1. Results obtained showed that for
all cases, rolling in grooved rolls required higher torque compared to rolling in flat rolls. In
general, it was observed that torque value increased as starting temperature decreases and
for each set of starting temperatures, the torque value increases with temperature. In all
cases, the torque values for grooved rolls were higher than those for flat rolls. This was due
to the higher frictional effect, occasioned by the larger contact area between roll and stock.
Results obtained also revealed an inverse relationship between strain rate and torque.