Prediction Of Roll Separating Force In A Roll Pass
Design Of Micro-alloyed Steel Rods
Author(s)
T. El-Bitar, M. El-Meligy & E. El-Shenawy
Abstract
The aim of the present work is to validate a constitutive model for the prediction
of roll force during rebar steel processing. Roll force is considered as an
important segment in the process of design dog bone and slit pass grooves.
Actual readings from the industrial rolling field were fed to the model to verify
the precision of calculation by model. During the rolling process, the steel
section changes from pass to pass, i.e. round-oval-round. The contact angle
between the stock and roll ram was divided into six equal segments instead of a
complicated process. The model is based on two dimensional plane strain
deformation. The contact area is divided into six zones with the same angles
dimension. Width, height, velocity, coefficient of friction, strain, strain rate, flow
stress and finally rolls separating force are calculated at each of the six points on
the roll surface. Mean values for each pass can then be numerically calculated.
The coefficient of friction is computed as a function of temperature as well as
velocity. Shida’s constitutive equation and its modification by Y. Lee are used to
calculate the flow stress Nb-V-micro-alloyed steel. Calculated flow stress
increases continuously with the increase of both strain and strain rate. On
verification of results, it is noticed that measured flow stresses are higher than
that calculated by a value ranging 30–40 MPa. Inside the roll gap, both flow
stress and roll separating force show a steep increase with the increase of the
contact angle, and the highest values are obtained at the outgoing point.
Keywords: bar rolling, separating roll force, flow stress, strain rate,
accumulative strain, contact angle, round-oval roll pass.
Keywords
bar rolling, separating roll force, flow stress, strain rate,
accumulative strain, contact angle, round-oval roll pass.
Related Book
Other papers in this volume
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