Журналы →  Non-ferrous Мetals →  2021 →  №1 →  Назад

METAL PROCESSING
Название Backward extrusion of pipe workpieces from non-ferrous alloys with a cone-shaped punch
DOI 10.17580/nfm.2021.01.07
Автор Pasynkov A. A., Tregubov V. I., Boriskin O. I.
Информация об авторе

Tula State University, Tula, Russia:

A. A. Pasynkov, Assistant Professor, Department of Mechanics of Plastic Forming, sulee@mail.ru
V. I. Tregubov, Professor, Department of Mechanics of Plastic Forming, tula@rambler.ru
O. I. Boriskin, Professor, Head of the Department of Instrumental and Metrological Systems, mpf-tula@rambler.ru

Реферат

The article presents the results of investigations of the backward extrusion operation of pipe workpieces to produce hollow thin-walled products with a changing cross-sectional area in the longitudinal direction. The process is very complex in terms of implementation, since considering various factors, this process can be carried out either with defects in the formation of geometry of the parts, or with significant forming forces, or with critical values of stresses and deformations. Therefore, the article presents the generalized research results on the pipe workpiece extrusion from 6Al-4V non-ferrous titanium alloy. The results of the conducted studies have allowed determining the influence of geometric characteristics of a working tool, friction, degree of deformation, temperature and forming velocity on formation of the part geometry, forces and stress. A statistical study of the results obtained was performed. Secondary mathematical models that make it possible to estimate an impact of the considered parameters upon the power characteristics of operations are obtained. The forming velocity conditions, which allow to ensure minimum process forces and to provide prescribed geometric characteristics of the products given different process variables and parameters of the tool geometry, have been established by analyzing simulation results. The factors that are most affecting the folding under deforming tool are identified. The results obtained can be used as recommendations for manufacturing of cylindrical hollow products through implementation of backward extrusion.

This work was supported by grants NSh-2601.2020.8 (НШ-2601.2020.8).

Ключевые слова Backward extrusion, pipe workpiece, force, forming velocity, forming, cone-shaped punch
Библиографический список

1. Uniksov E. P., Johnson W., Kolmogorov V. L. et al. Theory of Plastic Deformations of Metals. Moscow : Mashinostroeniye, 1983. 598 p.
2. Zhichao Sun, Jing Cao, Huili Wu, Zhikun Yin. Inho mogeneous Deformation Law in Forming of Multi-Cavity Parts under Complex Loading Path. Journal of Materials Processing Technology. 2018. Vol. 254. pp. 179–192.
3. 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.
4. Zhengyang Cai, Min Wan, Zhigang Liu, Xiangdong Wu, Bolin Ma, Cheng Cheng. Thermal-Mechanical Behaviors of Dual-Phase Steel Sheet under Warm-Forming Conditions. International Journal of Mechanical Sciences. 2017. Vol. 126. pp. 79–94.

5. Kräusel V., Birnbaum P., Kunke A., Wertheim R. Metastable Material Conditions for Forming of Sheet Metal Parts Combined with Thermomechanical Treatment. CIRP Annals. 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 Working. Moscow : Mashinostroenie. 1986. 216 p.
9. Pasynkov A. A., Boriskin O. I., Larin S. N. Theoretical Researches 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. 3. pp. 80–84. DOI: 10.17580/tsm.2018.03.12
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. Vol. 441. 012026. DOI: 10.1088/1757-899x/441/1/012026
11. Alves L. M., Afonso R. M., Silva C. M. A., Martins P. A. F. Boss Forming of Annular Flanges in Thin-Walled Tubes. Journal of Materials Processing Technology. 2017. Vol. 250. pp. 182–189.
12. Panfilov G. V., Nedoshivin S. V., Lazarev A. A. Active Statistical Analysis of Systems with Theoretical Models for the Conduct of Machine Experiment. Izvestiya Tula State University: Technical Sciences Series. 2014. No. 5. pp. 98–112.
13. Panfilov G. V., Nedoshivin S. V., Perminov D. A. Application Statistical Machine Experiment for Investigating Theoretical Models Stamping Cores Bullets. Izvestiya Tula State University: Technical Sciences Series. 2014. No. 6. pp. 61–73.

Полный текст статьи Backward extrusion of pipe workpieces from non-ferrous alloys with a cone-shaped punch
Назад