National University of Science and Technology “MISiS”, Moscow, Russia:

S. V. Samusev, Dr. Eng., Prof., Metal Forming Dept.
V. A. Fadeev, Post-Graduate, Metal Forming Dept., e-mail: fdv_viktor@mail.ru
A. S. Budnikov, Cand. Eng., Associate Prof., Metal Forming Dept.
M. B. Savonkin, Cand. Eng., Associate Prof., Metal Forming Dept.

A technique for determining the areas of contact surfaces for the lower and upper roll tools is presented. The study of contact surfaces was carried out on contact prints obtained as a result of the experiment. The drawbacks of the existing method of fixing the imprints of contact surfaces, in which the contact of the strip (tubular billet) with the rolls was determined through the paper, were analyzed and taken into account. A technique for fixing contact prints is proposed, in which there is a direct contact of the strip with the rolls. Parameters of the obtained contact prints of the strip with the lower and upper rolls for all forming stands electric of ERW mill 30–50 were measured. As a result of measurements of contact prints, additional parameters of the boundaries of contact surfaces are introduced. For the bottom and top rolls, the length of the contact was taken along the bottom and the flange of the roll, respectively. It was found that, in the first approximation, the contact surfaces can be rather exactly approximated by a power function. The internal contact surfaces of the strip with the upper rolls were approximated using a decreasing power function, while the external ones with the lower rolls — using an increasing power function. On the basis of experimental data and analysis of indentation parameters, a technique has been developed for determining the contact surfaces of a strip with lower and upper rolls of various configurations. The input boundary of the contact surface was determined by the shape index m. Comparison of the input boundaries of the contact surfaces obtained in the experiment and by the technique shows a high convergence.

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