Nosov Magnitogorsk State technical University (Magnitogorsk, Russia):

V. A. Kharitonov, Cand. Eng., Prof.
N. Yu. Smetneva, Postgraduate Student, e-mail: Natalibox92@mail.ru
N. V. Koptseva, Dr. Eng., Prof.
Yu. Yu. Efimova, Cand. Eng., Associate Professor

Data on manufacture of hardened-tempered spring wire are given. These products are used for manufacture of critical types of springs (for example, valve springs for automobile engines, suspension springs, etc.). Currently, hardened-tempered wire is especially in demand by Russian enterprises. In this regard, Russia has begun the production of wire with high strength, elastic limit and ensuring greater cyclic durability of springs, as part of the import substitution program and in accordance with EN 10270-2: 2012. Stricter technical requirements of this standard (compared to GOST 1071– 81) made it necessary to study the influence of plastic deformation conditions and hardening and tempering modes on the final properties of the wire. This is especially necessary to ensure a high level of relative contraction of area, which characterizes the structural homogeneity of the metal. The routes of drawing and quenching in oil with subsequent tempering of wire with a diameter of 3.7 mm from carbon and alloy steels are considered. The article presents an assessment of the operating modes of cold wire drawing according to the values of the hydrostatic stress, Δ-parameter and the tension zone, the level of normal pressure on the wire surface in the die and the drawing force; wire drawing; assessment of mechanical properties; quenching and tempering of the obtained samples in 12 modes in laboratory conditions, determination of mechanical characteristics, microstructure of heat-treated wire. Evaluation of hydrostatic stress, normal pressure and drawing force was carried out according to the results of computer simulation of wire drawing in the DEFORM program. Determination of the Δ-parameter and stretch zone size was carried out analytically. Studies have shown that, along with the steel grade and heat treatment modes, the wire drawing route has a great infl uence on properties of the wire and costs of its production. On the basis of the data obtained, an analysis was carried out and rational modes of wiredrawing were determined.

1. Votava J., Kumbár V., Polcar A. Optimisation of heat treatment for steel stressed by abrasive erosive degradation. Acta universitatis agriculturae et silviculturae mendelianae brunensis. 2016. Vol. 64, Iss. 4. pp. 1267–1277.
2. Izumida H., Matsumoto S., Murai T. History and Future of High-Fatigue-Strenght Steel Wire for Automotive Engine Valve Spring. Sei Technical Review. 2016. No. 82. pp 27–32.
3. Pykhov L. E., Gallyamov E. F., Smetneva N. Yu. Mastering the production of heat-treated spring wire from steel 54SiCr6 in conditions of JSC “BMK”. Stal. 2018. No. 6. pp. 39–41.
4. Kulesha V. А., Klekovkina N. А., Belalov Kh. N. et.al. Manufacturing of high quality hardware (scientific and practical experience of the Beloretsk Metallurgical Plant). Beloretsk, 1999. 328 p.
5. GOST 1071–81. Heat-treated steel spring wire. Specifications. Introduced: 01.01.1983.
6. Technical specifi cation 14-4-1195–82. Q&T spring wire made of 70 grade steel. Introduced: 01.01.1983.
7. Cheerova М. N., Komarova Т. V., Dubinskiy V. N. Development of measures to improve the quality of heat-treated spring wire. Zagotovitelnye proizvodstva v mashinostroenii. 2015. No. 3. pp. 39–44.
8. Komarova Т. V., Skudnov V. А., Gavrova М. N. Decreasing inhomogeneity of mechanical properties in heat-treated spring wire. Zagotovitelnye proizvodstva v mashinostroenii. Moscow, 2008. No. 7. pp. 39–45.
9. Cheerova М. N. Regularities of the formation of austenite grains and their application to improve the structural homogeneity and quality of spring wire: thesis of inauguration of Dissertation … of Candidate of Engineering Sciences: Nizhny Novgorod state technical university named after R. E. Alekseev, 2008. 24 p.
10. Yamamoto T., Kobayashi R., Ozone T., Kuritomo M. Precipitation strengthening spring steel for automotive suspensions. Vanadium Structural Steels – Reprint of papers on vanadium steel from the proceedings of ASM HSLA Steels Technology and Applications Conference, Philadelphia, USA. 1983. pp. 227–234 [Electronic resource] Available at: http://vanitec.org/wp-content/uploads/2011/09/Precipitation-Strengthened-Spring-Steel-for-Auto motive-Suspensions.pdf (accessed: 19.11.2015).
11. Shavrin О. I. Technology and equipment for thermomechanical processing of machine parts. Moscow: Mashinostroenie, 1983. 176 p.
12. Krymchanskiy I. I. Rolled products from alloyed spring steels at the new section rolling 370/150 mill of OJSC “BMZ” — the management company of the “BMK” holding. Pruzhiny. 2017. No. 2. pp. 13–17.
13. Belalov Kh. N., Klekovkina N. А., Nikiforov B. А. et. al. Steel wire manu facturing: monograph. GOU VPO “MGTU”, 2005. 543 p.
14. Kharitonov V. А., Usanov М. Yu. Efficiency of application of torsional deformation in methods of production of nanostructured wire. Vestnik Magnitogorskogo gosudarstvennogo tekhnicheskogo universiteta imeni G. I. Nosova. 2016. No. 4. pp. 66–71.
15. EN 10270-2:2012. Steel wire for mechanical springs — Part 2: Oil hardened and tempered spring steel wire, MOD.
16. Kharitonov V. А., Usanov М. Yu. Improvement of the methodology for calculating drawing routes for high-carbon steels. Chernaya metallurgiya. Byulleten nauchno-tekhnicheskoy i ekonomicheskoy informatsii. 2017. No. 8. pp. 92–96.
17. Wright R. N. Mechanical analysis and die design. Wire Journal International. 1979. pp. 60–61.
18. Wright R. N. Mechanism of wire breaks. Wire Journal International. 1982. pp. 86–90.
19. Hassan A. K. F., Hashim A. S. Three dimensional finite element analysis of wire drawing process. Universal Journal of Mechanical Engineering. 2015. Vol. 3. No. 3. pp. 71–82.
20. GOST 8233–56. Steel. Microstructure standards. Introduced: 01.07.1957.
21. GOST 9453–75. Dies-blanks of sintered hard alloys for drawing wire and round section rods. Introduced: 01.01.1977.
22. Gubkin S. I. Theory of metal forming. Moscow: Metallurgizdat, 1947. 532 p.
23. Smetneva N. Yu., Usanov М. Yu., Kharitonov V. А. Improvement of the modes for drawing carbon wire based on the development and implementation of new methods for calculating drawing routes. Aktualnye problemy sovremennoy nauki, tekhniki i obrazovaniya. 2019. Vol. 10. No. 1. pp. 21–26.