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Design of intermediate roll contour and analysis of regulation ability on strip shape of 18-High mill

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Abstract

The corresponding objectives and principles of the intermediate roll contour design are proposed to improve the strip edge drop problem in the process of 18-High mill production and enhance the regulation ability on strip shape. The intermediate roll contour is designed using the particle swarm optimisation algorithm to satisfy the production requirements. The elastic–plastic coupling finite element model of roll system–rolling piece integration is established, the application effect of the new roll contour is verified, and the regulation ability on strip shape under the new roll contour is analysed. Results show that, compared with the original roll contour, the strip edge drop phenomenon is remarkably improved. The regulation ability on strip shape is evidently improved compared with that of the original roll contour. The regulation ability on strip shape of the intermediate roll shifting is stronger than that of the intermediate roll bending force under the new roll contour. Finally, combined with field data of rolling, the finite element model is verified on site. The simulation and measured values are high, and the error is within 10%. The research results can provide a good theoretical basis for the improvement of the intermediate roll contour and improvement of the regulation ability on strip shape of 18-High mill.

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Authors and Affiliations

  1. National Engineering Research Center for Equipment and Technology of Cold Strip Rolling, Yanshan University, Qinhuangdao, 066004, Hebei, China

    Jun Zhao, Jing-Na Sun, Tong Wu, Chao-Jian Guo & Hua-Gui Huang

Authors
  1. Jun Zhao
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  2. Jing-Na Sun
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  3. Tong Wu
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  4. Chao-Jian Guo
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  5. Hua-Gui Huang
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Contributions

Jun Zhao analyses the simulation and field test data and completed the draft. Sun Jingna provides simulation ideas and organises field tests. Tong Wu provides constructive suggestions on the field tests. Chaojian Guo helps to check the accuracy of the field test data. Huagui Huang assists Zhao Jun in collecting data in production enterprises.

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Correspondence to Jing-Na Sun.

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Appendices

Appendix 1

As shown in Fig. 14, Q(x) is the contact normal stress between the intermediate roll and the work roll, P(x) is the rolling force and B is the width of the strip.

Fig. 14
figure 14

Contact state between intermediate roll and work roll

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Appendix 2

The transverse distribution difference of strip thickness (UI) can be expressed as Eq. (15). hc is the thickness of the centre of the strip cross section, and h (xi) is the thickness of any point in the strip cross section, as shown in Fig. 15.

$$\text{UI(}x_\text{i}\text{)=}\mathrm h\text{(}x_\text{i}\text{)}-{\mathrm h}_\text{c}$$
(15)
Fig. 15
figure 15

Strip steel cross section diagram

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Zhao, J., Sun, JN., Wu, T. et al. Design of intermediate roll contour and analysis of regulation ability on strip shape of 18-High mill. Int J Adv Manuf Technol 131, 6139–6151 (2024). https://doi.org/10.1007/s00170-024-13090-0

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