Asymmetrical rolling analysis of bonded two-layer sheets and evaluation of outgoing curvature
A theoretical model based on slab method is proposed to analyze asymmetrical rolling of bonded two-layer sheets where the ingoing sheet is forced to horizontally enter the roll gap. Separate equilibrium equations as well as yield relations are derived for each layer by considering different stress fields for the two layers of any slab within the roll gap. A large angle of bite is considered in the governing equations as the experimental data used for verifying the results belong to the rolling conditions where small bite angle assumption is not reasonable. The curvature of the sheet at exit from the roll gap is estimated by studying variations of the normal and the shear strains within the whole roll gap. A very good agreement is shown to exist between the rolling force as well as the outgoing curvature predicted by the present model and the available analytical and experimental results reported by other investigators. By studying the outgoing curvature at different conditions, some practical suggestions to minimize the strip curvature at exit from the roll gap are proposed.
KeywordsBonded two-layer sheet Slab method Asymmetrical rolling Outgoing curvature
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- 1.Hamauzu S (1987) The FEM analysis of hot clad sheet rolling and avoidance of curvature. Iron Steel A 59:59–62 (in Japanese)Google Scholar
- 2.Shiyouya S (1989) The analysis of clad sheet rolling by FEM. Proceeding for the 40th Joint Conference of JSTP 81-84 (in Japanese)Google Scholar
- 5.Tzou GY, Lee KL, Jian HR, Lion JC, Huang MN (2000) Analysis of the cold and hot bond rolling of clad sheet. Proceeding of 8th Int Conf on Metal Forming, Krakow, Poland 116–120Google Scholar
- 6.Hwang YM, Manabu K (1992) Analysis of asymmetrical complex rolling of multi-layer sheets by upper bound method. J Chin Soc Mech Eng 13:33–45Google Scholar
- 9.Reyds D, Dyja H, Berski S (2003) The prediction of curvature of bimetallic plate Al-Cu during asymmetrical cold rolling. METABK 42:261Google Scholar
- 14.Ghobrial MI (1989) A photo elastic investigation on the contact stresses developed in rolls during asymmetrical rolling. Int J Mech Sci 34:757–764Google Scholar