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| Analysis on wall thickness eccentricity of cross-roll pierced shells of seamless steel tube |
| Lv Qing-gong，MU Ren-ling，XU Wen-jing |
| （School of Advanced Engineering， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract The WTES （Wall Thickness Eccentricity of the cross-roll pierced Shell）is an important reason causing the uneven wall thickness of seamless steel tubes. A deep understanding of the characteristics and influencing factors of the WTES is the prerequisite for controlling the wall thickness accuracy of the seamless steel tubes. In this paper, the WTES of seamless steel tubes is characterized based on a series of production trials. With the calculation models of the WTES established by analytical methods，the values of the WTES are forecast and compared with the measured data pointing at actual production conditions. Based on the research of the influences of the technical factors upon the WTES，the methods to improve the WTES are analyzed. The results show that the WTES can be characterized as “eccentric screw type”，occupying more than 70% of the wall thickness unevenness of the shells. The temperature eccentricity of round billets is a very important factor influencing the WTES，with a proposed control range of less than 10 ℃. Increasing cross piercing deformation and the rotation times of shells is beneficial to the improvement of the WTES，and the corresponding measures are to reduce the feed angle，increase plug diameter，decrease the diameter of round billet，and increase the length of the transition zone of rolls. Increasing cross piercing speed is conducive to improve the WTES.
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Received: 10 January 2017
Published: 28 July 2017
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2017, Vol. 52 
