Erpalov M.V., Bogatov A.A. Investigation of the causes of defects at octg upsetting

Abstract

The paper deals with the quality issues of OCTG with upset ends produced on SMS Meer hydraulic presses. It focuses on the causes of defects appearing on the inner surface of products in the form of underfilled pass near the pipe end. The results of computer simulation of upsetting have established dependence of defects formation on technological factors, including original workpiece sizes. The industrial experiment results have confirmed the key points of the computer simulation and allowed formulation of requirements to a workpiece and tool calibration which eliminate defects formation on the inner surface of pipes. The results of this work have made it possible to intensify the pipe end upsetting process in a single pass with an increase in a wall-thickening ratio up to 1.85.

Keywords

Tubing, drill pipe, pipe end upsetting, product quality, finite element modeling, industrial research.

Erpalov Mikhail Viktorovich – Research Assistant, Ural Federal University named after the first President of Russia B.N. Yeltsin, Ekaterinburg, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

Bogatov Alexandr Alexandrovich – D.Sc. (Eng.), Professor, Head of the Metal Forming Department, Ural Federal University named after the first President of Russia B.N. Yeltsin, Ekaterinburg, Russia. E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it..

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Details: Published: 25 December 2015; Last Updated: 25 December 2015; Hits: 2453