《Table 3.Influence of the sheet thickness on the thickness re-duction error of sheet metal in the nu

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《Influence of a multi-step process on the thickness reduction error of sheet metal in a flexible rolling process》

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The target curvature radius of all of the processed convex surface parts is 200 mm in the compared experiments.The material is 1050 aluminum alloy，and the size of the sheet metal is 100 mm×200 mm×1.8 mm（width×length×thickness）.The forming steps differ，whereas the other processing parameters are the same.The forming path and forming steps of the multi-step forming process are shown in Table 4，and the plastic strain of the processed parts with different forming steps is shown in Fig.13.The plastic strain distribution is stable and continuous in the longitudinal direction.The forming qualities are good，so the multi-step process is feasible in flexible rolling.The plastic strain value increases with increasing number of forming steps.The influence of the multi-step forming process on the thickness reduction error of the sheet metal is shown in Table 5.With increasing number of forming steps，the roll gap height approaches the minimum thickness of the processed convex surface part and the thickness reduction error is effectively reduced.One-step forming is attributed to the much larger bending deformation of the sheet metal，resulting in a sharp increase of the work-hardening degree.Therefore，the multi-step forming process is used to avoid a sharp increase in the degree of work hardening.However，after three forming steps，the thickness reduction error is not further reduced.In conclusion，the thickness reduction error can be effectively reduced in the multi-step forming process.