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Effect of process parameters on steel tube roundness in straightening process

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Abstract

The inclined six-roll tube straightener is an important equipment for the finishing line. It can not only straighten the steel pipe, but also finish the ovality of the cross section. In the actual straightening process, the cross section of the tube is prone to deform, that is, the roundness is not good. The flattening displacement is an important parameter to control cross-section forming of tube. According to the established mechanical model, the analytical calculation equations of the flattening force and the flattening displacement were derived using the energy method. Based on the finite element simulation data, the ratios of the finite element results of the flattening force to the analytical ones were fitted. The correlation coefficient after fitting is greater than 99%, and the fitting effect is excellent. The flattening experiment was carried out on tubes of different materials and different specifications, and the setting method of the optimal flattening displacement during straightening process was obtained. In the actual straightening process, using this flattening displacement, the ovality of straightened steel tube is less than 0.3%. Therefore, the proposed method can provide a reference for the flattening displacement in the actual straightening process.

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Acknowledgements

This work was supported by National Key Research and Development Program of China (Grant No. 2018YFB1308700), Applied Basic Research Programs of Shanxi Province (Grant Nos. 201901D111244 and 201901D211311), and Major Science and Technology Projects of Shanxi Province (Grant No. 20181102016).

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Authors and Affiliations

  1. Coordinative Innovation Center of Taiyuan Heavy Machinery Equipment, Taiyuan University of Science and Technology, Taiyuan, 030024, Shanxi, China

    Li-dong Ma, Yu-kang Du, Zi-jian Liu & Pei-yu Liu

  2. School of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, Shanxi, China

    Li-dong Ma & Li-feng Ma

  3. School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan, 030024, Shanxi, China

    Yu-kang Du, Zi-jian Liu & Pei-yu Liu

  4. School of Applied Science, Taiyuan University of Science and Technology, Taiyuan, 030024, Shanxi, China

    Zhi-juan Meng

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  1. Li-dong Ma
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  2. Yu-kang Du
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  3. Zhi-juan Meng
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  4. Li-feng Ma
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  5. Zi-jian Liu
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  6. Pei-yu Liu
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Correspondence to Li-dong Ma.

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Ma, Ld., Du, Yk., Meng, Zj. et al. Effect of process parameters on steel tube roundness in straightening process. J. Iron Steel Res. Int. 27, 1270–1283 (2020). https://doi.org/10.1007/s42243-020-00497-8

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  • DOI: https://doi.org/10.1007/s42243-020-00497-8

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