DOI: 10.52150/2522-9117-2024-38-482-500

Bilodidenko Serhii Valentynovych, D. Sc. (Tech.), Professor, Department manager, Department of industrial mechanical engineering, Ukrainian State University of Science and Technologies, Lazariana St., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0002-5768-594X. E-mail: s.v.bilodidenko@ust.edu.ua

Mazur Ihor Anatoliiovych, Ph. D. (Tech.), Associate Professor, Associate Professor, Ukrainian State University of Science and Technologies, Lazariana St., 2, Dnipro, 49010, Ukraine. ORCID: 0000-0003-2177-7110. E-mail: i.a.mazur@ust.edu.ua

Dobriak Volodymyr Dmytrovych, Ph. D. (Tech.), Senior Engineer, SE “Ukrainian institute for designing iron and steel works”, Sicheslavska Naberezhna St., 17, Dnipro, 49000, Ukraine

Uhriumov Dmytro Yuriiovych, Technical Director, LLC “Marine Survey Company”, Kalynova St., 87, office 402, Dnipro, 49087, Ukraine.

Uhriumov Yurii Dmytrovych, Ph. D. (Tech.), Senior Engineer, SE “Ukrainian institute for designing iron and steel works”, Sicheslavska Naberezhna St., 17, Dnipro, 49000, Ukraine. E-mail: ugriumov1946@gmail.com

PROCESSES FOR PREPARING A WORKPIECE FOR PIERCING ON A CROSS-ROLLING MILL

Abstract. The operation of centering the front end of the workpiece, which reduces the heterogeneity of the front ends of sleeves and pipes, is widely used to improve the process of cross-roll stitching of workpieces. The preparation of the workpiece by profiling the conical section at its front end was not used in practice due to the lack of reliable technical solutions. Based on the analysis of the well-known processes of preparation of blanks for stitching on a skew rolling mill, it was established that the most effective is the complex preparation of the front end of the blank, which includes profiling and centering. From the processes of preparing the workpiece for stitching, namely: centering the front end and profiling the front end, only centering is widely used. Profiling of the front end of the workpiece is practically not used on pipe rolling units. Moreover, the joint application of these two processes in practice is not known. The purpose of this article is the development of technology and equipment for the complex preparation of the front ends of the blanks before stitching on a skew-rolling machine by profiling the end of the blank in a conical matrix and centering its front end. The proposed design of the site with equipment for complex preparation of the workpiece for stitching, which allows this preparation to be carried out in different positions when using several sizes of workpieces in diameter. The power parameters of pressing the workpiece into a conical matrix and centering by inserting a punch have been determined, and hydraulic cylinders have been selected for force impact on the workpiece from its front and rear ends. The results of the research can be recommended for the preparation of blanks for stitching on a skew-rolling machine of pipe-rolling units with a blank diameter of up to 200 mm. The implementation of the technical solutions proposed in this article will improve the conditions of gripping at the piercing stage and increase the accuracy of sleeves and pipes due to the reduction of the heterogeneity, which will reduce the level of the metal consumption coefficient.

Key words: billet, stitched cross-rolling machine, sleeve, hydraulic cylinder, rotary table, roller conveyor, matrix, punch, pressing force, sleeve accuracy, metal consumption coefficient.

DOI: https://doi.org/10.52150/2522-9117-2024-38-482-500

For citation: Bilodidenko, S. V., Mazur, I. A., Dobriak, V. D., Uhriumov, D. Yu., & Uhriumov, Yu. D. (2024). Processes for preparing a workpiece for piercing on a cross-rolling mill. Fundamental and applied problems of ferrous metallurgy, 38, 482-500. https://doi.org/10.52150/2522-9117-2024-38-482-500

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