For obtaining the profile
and the projected area of contact zone exactly during alloyed bar rolling by
Round-Oval-Round pass sequence, the analytic model for the length contact and
contact boundary curve were built firstly by considering the influence of the spread
of the outgoing workpiece on the effective height of outgoing workpiece and
roll mean radius, and then the contact surface was discretized by finite flow
line elements. Moreover, the radius equation and bite angle equation of
different flow lines were derived and they were all expressed as the function
of the position angle, then any flow line on the contact surface can be determined since the
position angle has been given. Finally, since
the analytic equation for the projected area of contact surface was hard to be
integrated directly, the analytic model was proposed by summing up the area of
discretized parts on the contact surface. Based on the analytical model of
contact boundary and flow line element, 3-dimension contact surface was rebuilt
by mathematical software, and the validity of analytic model was examined by the bar
rolling experiments and the numerical simulation of alloyed bar rolling by
rigid-plastic FEM software. Compared with the existing models, the precision of
the projecting area of contact zone was improved obviously. So, it can be applied in alloyed bar rolling to
predict the projected area of contact zone and velocity of outgoing
workpiece exactly.
Cite this paper
Dong, Y. , Zhu, H. and Song, J. (2017). Novel Analytic Model for the Projected Contact Zone Based on the Flow Line Element Method in Alloyed Bar Rolling. Open Access Library Journal, 4, e3247. doi: http://dx.doi.org/10.4236/oalib.1103247.
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