We describe the results of an experimental study of longitudinal and transverse variations in wall thickness at the ends of pipes after rolling in a stretch-reducing mill (SRM). We found that the largest “contribution” to the scatter in wall thickness comes from internal hexagon produced in the pipes by the reduction-mill drawing schedule and the roll pass design. A mathematical model was developed based on current high-speed SRM mode calculation procedures, and the plastic tension coefficients, rolling diameters, and roller speeds for each SRM stand in steady-state rolling mode were calculated. The pipe wall thicknesses calculated using the mathematical model were similar to those obtained experimentally. The accuracy of the pipe inside diameter was determined.
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Notes
State Software Registration Certificate No. 2015660153, V. B. Timofeev, A. S. Anan’ev, I. B. Medyantsev, and S. I. Zaboev, Automatic Control of Stand Drives on a TESA 20-102 Stretch-Reducing Mill to Maintain Constant Wall Thickness of Finished Pipes, registration date 23 September 2015.
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This work was performed with the support of Russian Federation Presidential Grant MK-3011.2017.8.
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A. A. Bogatov is Deceased
Translated from Metallurg, Vol. 62, No. 6, pp. 65–70, May 2018.
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Bogatov, A.A., Pavlov, D.A., Timofeev, V.B. et al. Theoretical and Experimental Study of Non-Steady-State Pipe Reduction Process Using a Tesa 20-102 Mill. Metallurgist 62, 559–567 (2018). https://doi.org/10.1007/s11015-018-0693-z
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DOI: https://doi.org/10.1007/s11015-018-0693-z