Analytical investigations of the accuracy of the small diameter tool-joint tapered thread made by a lathe machining

Open access


The drill string consists of connected drill pipes and other elements. The connection is carried out by screwing of the drill string elements with the help of tool-joint tapered thread. The operational characteristics of the drill pipes depend of the manufacture precision of these tool-joints mostly. The accuracy of the thread is regulated by the accuracy of its profile and the accuracy of its pitch diameter value. The accuracy of the tapered thread manufacturing on the lathe in its depending on the values of the geometric parameters of the lathe tool and the values of deviations of its installation relatively to the workpiece axis is investigated. It is proved that for the tapered thread of form VI profile used for connection of drill pipes with the diameter from 30 mm to 44 mm the most influential factor, in relation to the accuracy of the thread profile is the value of the rake angle. Application of the rake angle value up to −5° according to the research data leads to a deviation from the specified profile of 0.3°, which is more than 35% of the declared standard tolerance on deviations from the profile. Also, the influence of the back rake angle value on the value of the deviation from the standard pitch diameter of the thread is proved. It is proved that the magnitude of the tangential displacement of the nose of the cutter relatively to the axis of the thread up to −0.2 mm can cause a deviation of the profile angle of 0.18°, which is 27% of the standard tolerance.

If the inline PDF is not rendering correctly, you can download the PDF file here.

  • Baizeau T. Campocasso S. Fromentin G. Rossi F. and Poulachon G. (2015). Effect of rake angle on strain field during orthogonal cutting of hardened steel with c-BN tools. In: 15th CIRP Conference on Modelling of Machining Operations. pp. 166-171. DOI: 10.1051/matecconf/201711201005

  • Fedorova L. Fedorov S. Ivanova Y. and Voronina M. (2017) Increase of Wear Resistance of the Drill Pipe Thread Connection by Electromechanical surface Hardening. International Jornal of Applied Engineering and Research Volume 12 Namber 18 pp. 7485-7489.

  • Fomin E. (2007). Povyshenye stojkosty itochnostirezbov yx rezczovna osnove modelirovanyya proces sarezbona rezaniya. PhD Moscow State Technological University “Stankin”.

  • Koleva S. Enchev M. Szecsi T. (2017). Compensation of the deviations caused by mechanical deformations during machining of threads. In: Manufacturing Engineering Society International Conference. [online] Vigo (Pontevedra): NCTT pp. 480-486. Available at: [Accessed 24 June. 2019].

  • Kopei V. Onysko O. Panchuk V. (2019) The Application of the Uncorrected Tool with a Negative Rake Angle for Tapered Thread Turning. In: Ivanov V. et al. (eds) Advances in Design Simulation and Manufacturing II. DSMIE 2019. Lecture Notes in Mechanical Engineering. Springer Cham. pp. 149-158.

  • Laurențiu Slătineanu Miroslav Radovanovic Margareta Coteață Irina Beșliu Oana Dodun Ionel Coman and Sergiu-Constantin Olaru. (2017). Requirements in designing a device for experimental investigation of threading accuracy. In: MATEC Web of Conferences 112 01005. pp. 1-6 DOI: 10.1051/matecconf/201711201005

  • Li Kang Jiang Li and Chen Ming (2014). Experimental study on the influence of cutting parameters on thread precision of external thread turning. Material Science Forum. Vol. 770. Trans Tech Publications Switzerland pp. 7-12. doi: 10.4028/

  • Onysko O. R. Psiuk M. I. (2017). Analiz zabezpechennia tochnosti profiliu zamkovoi narizi vyhotovlenoi riztsiamy iz zahalnym polozhenniam perednoi poverkhni ta zadanoi tochnistiu yii vstanovlennia. Visnyk NTU «KhPI». Seriia: Tekhnolohii u mashynobuduvanni. pp. 10-17.

  • Van Wittenberghe J. De Baets P. De Waele W. and Van Autrève S. (2009) Numerical and experimental study of the fatigue of the threaded pipe couplings. Wit Transactions on Engineering Sciences Vol 62 pp. 163-164 /doi:10.2495/SECM090151 [Accessed 23 June 2019].

  • Wang Yu. Xia Bairu Wang Zhiqiao and Chai Chong. (2016) Model of a new joint thread for a drilling tool and its stress analysis used in a slim borehole. Mech. Sci. 7 189-200 2016 [Accessed 21 June 2019].

  • Zanger F. Sellmeier V. Klose J. Bartkowiak M. Schulce V. (2017). Comparison of modeling methods to determine cutting tool profile for conventional and synchronized whirling. In: 16th CIRP Conference of Modelling of Machining Operations. pp. 222-227. doi: 10.1016/j.procir.2017.03.216

Journal information
All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 21 21 18
PDF Downloads 26 26 24