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Research on quarter-wave control in DP980 steel during cold rolling based on multi-pass simulation

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Abstract

Quarter-wave flatness defect often appears in the DP980 cold rolling process, seriously affecting product quality. To find the causes of this kind of flatness defect, a multi-pass finite element model (FEM) based on a 2130 UCM mill was established, and the accuracy of the model was verified by three methods. The simulation results of the S3 and S4 stands show that the deviation between the simulated and theoretical profiles can be reduced when the work roll bending (WRB) force approaches the positive limiting value; as the WRB force decreases, the reduction in the quarter position of the strip increases significantly. The S5 stand is simulated under different rolling force conditions, and when near the real rolling force, the strip plastic deformation exists only in the central area effect, which is unable to solve the abnormal thickness in quarter position. The control effect of unit forward tension, entry profile, and bending force of the S3 stand was analyzed systematically. The results show that the actual setting value will cause a quarter wave, and improving the WRB force is useful to reduce but cannot eliminate the flatness defect, which is verified by experiments. The work roll compensation curve is designed to eliminate the flatness defect, and the experiment results show that the work roll compensation curve has an obvious control effect on the quarter wave.

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Funding

This work was financially supported by the National Natural Science Foundation of China (grant no. 52004029), China Postdoctoral Science Foundation funded project (2021M690352), and Fundamental Research Funds for the Central Universities (FRF-TT-20–06).

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Contributions

Luzhen Chen analyzed the simulation and experimental data and completed the draft; Wenquan Sun provided the simulation idea and organized the experiment; Anrui He instructed the revision of the draft; Chao Liu helped to verify the accuracy of the FEM; Yi Qiang provided constructive suggestions on experiments; Guanyu Zhou and Jianwei Zhao helped to check the accuracy of the experimental data; and Tieheng Yuan helped collect data in production enterprises.

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Correspondence to Wenquan Sun.

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Appendix

Appendix

The deformation resistance model, which considers the uneven characteristics of the transverse mechanical properties of the strip, can be expressed as Eq. (10)

$$k_{s} (x) = L(x) \cdot (\varepsilon (x) + M(x))^{N(x)}$$
(10)
$$L(x) = \left\{ \begin{array}{ll} - 1.6722452x + 818.760477 & {(x \le - 441)} \\ \quad 6.2683453 \times 10^{ - 4} x^{2} - 6.21725 \times 10^{ - 15} x + 1430.0964 & {(x \le 441)} \\ \quad 1.6722452x + 818.760477 & {(x \le 520)}\end{array} \right.$$
(11)
$$M(x) = \left\{ \begin{array}{ll} - 4.9637387 \times 10^{ - 9} x^{3} - 6.57679 \times 10^{ - 6} x^{2} - 2.90178 \times 10^{ - 3} x - 0.42445299 & {(x \le - 408.72)} \\ \quad 2.069494 \times 10^{ - 14} x^{4} - 7.16821 \times 10^{ - 9} x^{2} + 0.00242 & (x \le 408.72) \\ \quad 4.9637387 \times 10^{ - 9} x^{3} - 6.57679 \times 10^{ - 6} x^{2} + 2.90178 \times 10^{ - 3} x - 0.42445299 & {(x \le 520)} \end{array} \right.$$
(12)
$$N(x) = \left\{ \begin{array}{ll} - 1.633901 \times 10^{ - 8} x^{3} - 2.07327 \times 10^{ - 5} x^{2} - 8.845872 \times 10^{ - 3} x - 1.13087 & {(x \le - 408.72)} \\ - 4.697987 \times 10^{ - 7} x^{{}} + 0.136588 & { (x \le - 260)} \\ - 1.139053 \times 10^{ - 8} x^{2} + 2.6 \times 10^{ - 29} x + 0.13748 & (x \le 260) \\ \quad 4.697987 \times 10^{ - 7} x^{{}} + 0.136588 & { (x \le 408.72)} \\ \quad 1.633901 \times 10^{ - 8} x^{3} - 2.07327 \times 10^{ - 5} x^{2} + 8.845872 \times 10^{ - 3} x - 1.13087 & (x \le 520) \end{array} \right.$$
(13)

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Chen, L., Sun, W., He, A. et al. Research on quarter-wave control in DP980 steel during cold rolling based on multi-pass simulation. Int J Adv Manuf Technol 123, 83–98 (2022). https://doi.org/10.1007/s00170-022-10055-z

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