REGULARITIES OF DISTRIBUTION OF WIRE DEFORMATION IN MULTILAYERED STRAND AT CIRCULAR CALIBRATION COMPRESSION

The mechanism of plastic crimping of the strand has been identified and justified, as the process of formation of arches: a strong arch of wires, the appearance of each leads to a change in stressed state of the strand at reduction stages. It was established that before appearance of the first arch, wires of the outer layer and the central wire are the most priority to deformation, with the initial absence of side contacts. After appearance of each arch, stresses in wires of the arch layer become predominantly compressive, which temporarily prevents the given layer from actively deforming, up to the formation of arches in all other layers of the strand. After formation of all arches, wires of the upper layer again become the most priority to deformation. Central wire of the strand is overstrained in relation to all other wire strands at all stages of compression. The developed technique allows analyzing the degree of working out of each wire of a lock at a certain amount of reduction. It reflects the features of a multilayered strand deformation: sharp increase in width of the newly appeared contact at almost constant reduction; arches formation; non-simultaneous occurrence of new contacts in layers of strands due to the geometry of the strand and direction of the wires displacement. Application of the proposed technique allows to make rational designs of strands and ropes subjected to small and medium circular plastic crimping, as well as to determine the necessary amount of compression of strands and ropes of a particular design, proceeding from the conditions for retaining the flexibility of the rope and forming the required contact geometry of the wires. It was found that for strands with a diameter of 7.68 mm in the construction of 1 + 5 + 5/5 + 10, the most uniform development of the strand and the contacts is ensured during the reduction in the range of 3.74 < Q < 7.06 %. Intensive filling of the gaps in the strand begins at Q = 7.06 %, which determines the subsequent deformation as the limiting for the ropes working on bending both for performance characteristics and for the conditions of operation of the round caliber of a roller die.

1. Malinovskii V.A. Stal’nye kanaty. Ch. 1 [Steel ropes. Part 1]. Odessa: Astroprint, 2001, 188 p. (In Russ.).

2. Wehking K., Ziegler S. Berechnung eines einfachen Seils mit FEM. Draht Magazine. 2003, no. 5, pp. 32–36.

3. Haritonov V.A., Zaretsky L.M. Rolling for the production of plastically strained ropes and strands. Eurowire Magazine. 2004, no. 1, pp. 100–101.

4. Pyshnyak O.A., Chayun I.M. Influence of technological stresses on boundary conditions of the rope. In: Stal’nye kanaty: sb. nauch. tr. Vyp. 8 [Steel ropes: coll. of sci. papers. Issue 8]. Odessa: Astroprint, 2010, pp. 120–126. (In Russ.).

5. Chayun I.M., Pyshnyak O.A., Nepomnyashchii A.V. Preliminary deformed state of spiral ropes. In: Stal’nye kanaty: sb. nauch. tr. Vyp. 8 [Steel ropes: coll. of sci. papers. Issue 8]. Odessa: Astroprint, 2013, pp. 141–155. (In Russ.).

6. Kharitonov V.A., Lapteva T.A. Choice of deformation modes during crimping of multilayer ropes in three-roll drawing dies. Proizvodstvo prokata. 2013, no. 8, pp. 18–25. (In Russ.).

7. Danenko V.F., Gurevich L.M., Shatalin S.Yu., Kishechnikova I.S. Increase of physico-mechanical and service properties of plastically crimped steel strands and ropes made of them. Izv. VolGTU. 2015, no. 8, pp. 72–76. (In Russ.).

8. Gurevich L.M., Danenko V.F. Optimization of the parameters of plastic crimping of steel ropes for the purpose of increasing the physico-mechanical and service properties. Izv. VolGTU. 2016, no. 2, pp. 78–83. (In Russ.).

9. Danenko V.F., Gurevich L.M. Effect of circular plastic crimping on the stress-strain state of a single rope steel rope. Stal’. 2016 , no. 12, pp. 58–62. (In Russ.).

10. Danenko V.F., Gurevich L.M., Kushkina E.Yu., Gladskikh E.B. Extension of the scope of steel compacted strands and ropes made of them. Izvestiya. Ferrous Metallurgy. 2016, vol. 59, no. 11, pp. 764–772. (In Russ.).

11. Zhang Min, Kou Zi-ming. Duo chuan xin gangsi sheng yingli yingbian fenbu yanjiu. Meitan jishu = Coal Technol. 2016, vol. 35, no. 1, pp. 255–258. (In Chin.).

12. Skalatskii V.K., Emel’yanov V.G. Determination of optimal conditions for the process of plastic crimping of strands. In: Stal’nye kanaty: sb. nauch. tr. Vyp. 8 [Steel ropes: coll. of sci. papers. Issue 8]. Kiev: Tekhnika, 1971, pp. 104–113. (In Russ.).

13. Chayun I.M., Chayun M.I. Method of finite elements in the study of deformed and stressed state of ropes. In: Stal’nye kanaty: sb. nauch. tr. Vyp. 2 [Steel ropes: sb. sci. pap. Issue 2]. Odessa: AstroPrint, 2001, pp. 24–34. (In Russ.).

14. Vilceanu Lucia, Babeu Tiberiu Dimitrie, Ghita Eugen. Numerical analysis of calculation of wire ropes lifetime by the finite element method. In: Stal’nye kanaty: sb. nauch. tr. Vyp. 3 [Steel ropes: coll. of sci. papers. Issue 3]. Odessa: AstroPrint, 2003, pp. 95–100. (In Russ.).

15. Pataraya D., Nozadze G. etc. Computer modeling and calculation of the cable system of ring cableways. In: Stal’nye kanaty: sb. nauch. tr. Vyp. 7 [Steel ropes: coll. of sci. papers. Issue 7]. Odessa: Astro-Print, 2009, pp. 153–161. (In Russ.).

16. Pataraya D., Nozadze G. On simulation of force transfer in the drive pulley-rope system. In: Stal’nye kanaty: sb. nauch. tr. Vyp. 7 [Steel ropes: coll. of sci. papers. Issue 7]. Odessa: AstroPrint, 2009, pp. 217–222. (In Russ.).

17. Danenko V.F., Gurevich L.M., Pronichev D.V., Trunov M.D. Computer simulation in designing the process of circular reduction of a lightning-proof cable with an optical module. Izv. VolGTU. 2015, no. 8, pp. 97–102. (In Russ.).

18. Ren Zhiqian, Yu Zongyue,Chen Xun. Model for taking into account the effect of elastoplastic damages on the strength of a wire rope. Jixie gongcheng xuebao = J. Mech. Eng. 2017, vol. 53, no. 1, pp. 121–129.

19. Jiao Ai-sheng, Liu Li-mei, Yan Hui-ping. Modeling the choice of parameters of steel ropes Warrington. Meikuang jixie = Coal Mine Mach. 2016, vol. 37, no. 1, pp. 236–238.

20. Kharitonov V.A., Ivantsov A.B., Lapteva T.A. Modeling the stressed state of the strand with a calibrated reduction in a roller die. Chernaya metallurgiya. Byul. in-ta “Chermetinformatsiya”. 2016, no. 9, pp. 90–94. (In Russ.).

21. Malinovskii V.A. Stal’nye kanaty. Ch. 2 [Steel ropes. Part 2]. Odessa: Astroprint, 2002, 180 p. (In Russ.).

22. Glushko M.F. Stal’nye pod”emnye kanaty [Steel hoisting ropes]. Kiev: Tekhnika, 1966, 328 p. (In Russ.).

23. Biryukov B.A. Issledovanie i razrabotka tekhnologii plasticheskogo deformirovaniya provolochnykh pryadei v rolikovoi voloke: Avtoref. dis. … kand. tekhn. nauk [Research and development of the technology of plastic deformation of wire strands in a roller die: Extended Abstract of Cand. Sci. Diss.]. Magnitogorsk, 1974, 20 p. (In Russ.).

24. Kharitonov V.A., Lapteva T.A. The methods of determining the width of wires contact with small strands reduction. Izvestiya. Ferrous Metallurgy. 2012, no. 4, pp. 66–67. (In Russ.).

25. Kharitonov V.A., Lapteva T.A. Calculation of the distribution of deformations along the cross section of a strand under circular compression. Vestnik MGTU im. Nosova. 2012, no. 4, pp. 47–51. (In Russ.).