Journals →  Tsvetnye Metally →  2024 →  #2 →  Back

METAL PROCESSING
ArticleName Hot upsetting of axisymmetric workpieces made of titanium alloys
DOI 10.17580/tsm.2024.02.09
ArticleAuthor Pasynkov A. A., Romanov P. V., Nuzhdin G. A.
ArticleAuthorData

Tula State University, Tula, Russia

A. A. Pasynkov, Associate Professor at the Department of Plastic Forming Mechanics, Candidate of Technical Sciences, e-mail: sulee@mail.ru
P. V. Romanov, Postgraduate Student at the Department of Plastic Forming Mechanics

 

Tekhpolikom Research & Production Company, Moscow, Russia
G. A. Nuzhdin, Deputy General Director, Candidate of Technical Sciences, e-mail: nuzhdin.65@mail.ru

Abstract

This paper considers the process of upsetting applied to a section of barstock that helps achieve a considerable difference in cross-sections in relation to the vertical axis. This forming operation is quite widespread finding real application in the production of adapters for various machines. The process is not complicated and does not require any full-fledged substantiation. However, when making certain parts for special-purpose machinery one may face difficulties associated with the mechanical properties of the workpiece material used. They are either titanium or aluminium superalloys that are usually used for parts of special-purpose machinery. Theoretical substantiation is required to justify the process of upsetting workpieces made of superalloys. Such materials should usually be hot stamped. And deformation rates produce a considerable impact on the stamping force and the stress-strain state. The upsetting process can be adequately described with the upperbound theorem of plasticity. In view of the above statement, the authors simulated the upsetting of a titanium alloy VT6 pipe on the basis of the solution of the external and internal forces equilibrium equation. We shall consider an axisymmetric strain pattern and a non-stationary velocity field. Simulation of the upsetting operation resulted in expressions for assessing the pressure and continuity of the workpiece material. The authors used the quantitative results of mathematical modelling to perform a regression estimate of the pressure and continuity values. Natural values of regression equations were obtained to analyze the influence of the key process parameters on the force and failure rate during upsetting. The obtained results could be used for assigning upsetting modes when dealing with titanium alloys.
Support for this research was provided under Grant 23-29-00470 by the Russian Science Foundation.

keywords Upsetting, mathematical modelling, pressure, continuity, upperbound method
References

1. Demin V. A., Larin S. N., Riskin R. V., Rizkova A. A. Study the influence of anisotropy of the drawing cylindrical part. CIS Iron and Steel Review. 2018. Vol. 16. pp. 25–28.
2. Larin S. N., Platonov V. I., Larina M. V. Geometry of the forming tool and how it influences the stress-strain state during backward-and-forward extrusion. Izvestiya Tulskogo gosudarstvennogo universiteta. Tekhnicheskie nauki. 2020. No. 5. pp. 451–456.
3. Zhichao Sun, Jing Cao, Huili Wu, Zhikun Yin. Inhomogeneous deformation law in forming of multi-cavity parts under complex loading path. Journal of Materials Processing Technology. 2018. Vol. 254. pp. 179–192.

4. Springer P., Prahl U. Characterisation of mechanical behavior of 18CrNiMo7-6 steel with and without under warm forging conditions through processing maps analysis. Journal of Materials Processing Technology. 2016. Vol. 237. pp. 216–234.
5. Krusel V., Birnbaum P., Kunke A., Wertheim R. Metastable material conditions for forming of sheet metal parts combined with thermomechanical treatment. CIRP Annals – Manufacturing Technology. 2016. Vol. 65, Iss. 1. pp. 301–304.
6. Aksenov S. A., Chumachenko E. N., Kolesnikov A. V., Osipov S. A. Determination of optimal gas forming conditions from free bulging tests at constant pressure. Journal of Materials Processing Technology. 2015. Vol. 217. pp. 158–164.
7. Kyung-Hun Leea, Byung-Min Kim. Advanced feasible forming condition for reducing ring spreads in radial–axial ring rolling. International Journal of Mechanical Sciences. 2013. Vol. 76. pp. 21–32.
8. Malinin N. N. Creep in metal forming. Moscow : Mashinostroenie, 1986. 216 p.
9. Pasynkov A. A., Boriskin O. I., Larin S. N. Theoretical research on operation of isothermal distribution of tubes from difficult-to-form non-ferrous alloys in conditions of a short-term creep. Tsvetnye Metally. 2018. No. 2. pp. 74–78.
10. Larin S. N., Pasynkov A. A. Analysis of forming properties during the isothermal upsetting of cylindrical workpieces in the viscous-plasticity mode. IOP Conference Series: Materials Science and Engineering. 2018. Vol. 441, Iss. 1. 012026.
11. Unksov E. P., Johnson W., Kolmogorov V. L. et al. Theory of plastic deformations of metals. Moscow : Mashinostroenie, 1983. 598 p.
12. Panfilov G. V., Nedoshivin S. V., Perminov D. A. Application of statistical computer experiment for investigating the bullet core stamping model. Izvestiya Tulskogo gosudarstvennogo universiteta. Tekhnicheskie nauki. 2014. No. 6. pp. 61–73.

Language of full-text russian
Full content Buy
Back