Thermo-mechanical-metallurgical model to predict geometrical distortions of rings during cooling phase after ring rolling operations

Abstract

The paper presents a validated numerical model able to predict geometrical distortions of rings during cooling phase after hot ring rolling operations. The model is capable to take into account the effects of all the phenomena resulting from the coupling of thermal, mechanical and metallurgical events. As simulation results strongly depend on the accuracy of input data, physical simulation experiments on real-material samples are developed and carried out to characterize material behaviour during phase transformation. The numerical model is then validated by an industrial case proving its effectiveness in predicting final ring distortions at room temperature.

Towards a steady forming condition for radial–axial ring rolling

“…Moon et al [24] predicted the polygonal-shaped defects during hot ring rolling using a rigid-viscoplastic finite element method. Casotto et al [25] presented a thermo-mechanicalmetallurgical numerical model to predict geometrical distortions of rings during cooling phase after ring rolling operations. With the development of NC ring rolling mills, flexible or incremental ring rolling processes [26][27][28][29] have become an important innovative direction needed to be extended widely.…”

“…For a given v D , a series of values v fi of v f can be calculated by giving a series of values b i of b evenly spaced as i intervals between b f and b 0 . So the average value v f of v fi can be calculated byv f ¼ P i i ¼ 0 v fi =ðiþ 1Þ.Then substituting v f for v f in Eq (25),. the total rolling time T can be obtained by Eqs (24).…”

Rotation of axes for anisotropic metal in FEM simulations

“…The development of this code by the ArGEnCo department began in 1984 for rolling simulations . Since then, it has been applied to numerous other forming processes, such as forging (Habraken and Cescotto, 1990), continuous casting (Castagne et al, 2003(Castagne et al, , 2004, deep drawing (Duchêne et al, 2002), cooling processes (Habraken and Bourdouxhe, 1992;Casotto et al, 2005) and connection (Drean et al, 2002). LAGAMINE has a large element library (e.g.…”

Length changes and texture prediction during free end torsion test of copper bars with FEM and remeshing techniques

“…The development of this code began in 1984 for rolling simulations . Since then, it has been applied to numerous other forming processes, such as forging (Habraken and Cesc-otto, 1990), continuous casting (Castagne et al, 2004), deep drawing (Duchêne et al, 2002;Duchêne and Habraken, 2005), powder compaction (Mosbah et al, 1999) and cooling processes (Habraken and Bourdouxhe, 1992;Casotto et al, 2005). LAGAMINE has a large element library (see for instance Cescotto and Charlier, 1993;Zhu and Cescotto, 1994;, as well as numerous constitutive laws (Zhu and Cescotto, 1995;Habraken and Duchêne, 2004).…”