Analysis of stress-strain state in rough continuous rolling of electrical copper
DOI:
https://doi.org/10.14529/met160210Keywords:
bar rolling, electrical copper, deformation, strain rate, stressAbstract
The aim of the work is to analyze the stress-strain state in rough rolling in Mannesmann Demag Sack continuous mill. Computer experiments involved the use of DEFORM software package, and the finite element method was used to solve the problem. The change of the billet shape, distribution of the strain degree, strain rate and longitudinal stresses are analyzed.
In the fourth rolling pass, the zones of increased strain (up to 1.00 and above) are arranged along the circle arcs adjacent to the roll gap. The highest strain rate (up to 145 s–1) is also achieved at the inlet of the deformation zone directly beneath the rolls.
It is established that in all rough passes the greatest strain is localized at the outlet of the roll gap near the peripheral zones. The highest strain rate in each investigated pass is observed in contact areas at the inlet of the deformation zone. The largest longitudinal tensile stresses arise at the inlet and outlet of the deformation zone in non-contact areas. At the same time emergence of a large tensile stress on free surfaces during rolling of a rectangular billet in an oval caliber is revealed which can lead to the disclosure of cracks inherited from the foundry process.
References
Loginov Yu.N., Mysik R.K., Titov A.V., Romanov V.A. [Influence the Direction of Crystallization on the Anisotropy of Plastic Flow of Continuously Cast Copper]. Liteyshchik Rossii, 2008, no. 10, pp. 36–38. (in Russ.)
Loginov Yu.N., Zuev A.Yu. [Forming and Deformation Resistance of Anisotropic Continuously Cast Copper]. Zagotovitel'nye proizvodstva v mashinostroenii, 2011, no. 1, pp. 32–37. (in Russ.)
Kinzin D.I., Rychkov S.S. [Shape Rolling Processes Modelling Using DEFORM-3D Software Environment]. Vestnik of Nosov Magnitogorsk State Technical University, 2011, no. 2, pp. 45–48. (in Russ.)
Prasad Y.V.R.K., Sasidhara S. Hot Working Guide: A Compendium of Processing Maps. Ohio, ASM International, 1997. 545 p.
Loginov Yu.N., Inatovich Yu.V., Zuev A.Yu. [Investigation of Contact Friction During Hot Continuous Rolling of Electrical Copper Wire Rod]. Proizvodstvo prokata, 2010, no. 2, pp. 14–18. (in Russ.)
Postylyakov A.Yu., Loginov Yu.N. [Strain State Calculation of Copper Strip During Hot Rolling]. Plasticheskaya deformatsiya metallov [Plastic Deformation of Metals]. Dnepropetrovsk, Aktsent PP Publ., 2014, pp. 91–94. (in Russ.)
Postylyakov A.Yu., Loginov Yu.N. [Study of the Influence of Gage Size Geometry on Bar Strain State Using Finite Element Method]. New Technologies and Achievements in Metallurgy, Material Engineering and Production Engineering. Częstochowa, Politechnika Częstochowska Publ., 2014, pp. 276–279. (in Russ.)
Loginov Yu.N., Illarionov A.G., Demakov S.L., Ivanova M.A. Mysik R.K., Zuev A.Yu. [Structure Heterogeneity of Continuously Cast Copper]. Liteyshchik Rossii, 2011, no. 11, pp. 28–32. (in Russ.)
Loginov Yu.N., Eremeeva K.V. [Behaviour of Pore-Type Rolling Defects Adjacent to the Strip Surface]. Proizvodstvo prokata, 2008, no. 10, pp. 2–6. (in Russ.)
