EXPERIMENTAL DETERMINATION OF CUTTING RESISTANCE STRENGTH AT ASPHALT CONCRETE DESTRUCTION WITH A SINGLE CUTTING ELEMENT

Introduction. The article is devoted to the research results on cutting resistance of a road asphalt concrete in the process of the removal of worn coatings by the working elements of milling machines. The relevance of the work is due to the occurring of new brands of asphalt concrete alongside with the use of new types of cutting elements, for which it is difficult to predict the load on the working element when solving the problems of designing new ones and substantiation the operating conditions of the current machines. The purpose. The objective of the study of the interaction of a single cutting element of a road mill with a material at the best fit of speed and geometric parameters of a cutting process with real machines is solved.

Materials and methods. The experimental work was carried out by determining the tangential component of a cutting resistance strength, as well as the work of this strength on a pendulum desk using a unit recording equipment. Four different types of asphalt concrete were being destroyed. A two-factor experiment was conducted for each type of the material. The tangential components of a cutting resistance strength depending on the thickness of the cut chips and the temperature of the material were evaluated.

Results. As a result of the experiment, the data were obtained that make it possible to reasonably determine the loads on the teeth of road milling machines, to determine a power capacity of the process and the drive power of the working element. It was found that the growth of the tangential component to a cutting resistance strength occurs quite intensively alongside with an increase in the thickness of the cut chips, only at the initial stages of the penetration of the cutter. With an increase in the thickness of the cut chips, the growth of the tangential component to a cutting resistance strength does not occur so intensively. In all cases the temperature of the material has an impact on the value of a cutting resistance strength, but this effect is less significant for asphalt concrete with a higher crushed stone content.

Discussion and conclusion. The obtained data make it possible not only to determine the tangential strength to cutting resistance on the cutting elements of the working element of the milling machine, but also to find rational ways to place the cutting elements on the working element, as well as to determine the rational operation conditions of the current and new machines. This is possible when using the results in a mathematical model that describes the operation of the milling working element as a whole.

Financial transparency: the authors have no financial interest in the presented materials or methods. There is no conflict of interest.

1. Vershinin A.V. Vlijanie neravnomernosti skorosti rezanija merzlogo grunta podkopochnoj mashiny na jenergoemkost’ ego razrushenija [The influence of the unevenness of cutting speed of frozen soil of a digging machine on the energy intensity of its destruction]. Sovremennye problemy nauki i obrazovanija. 2014; №6: 264 (in Russian).

2. Nikolaev V.A. Approximate calculation of the circular soil cutting capacity. The Russian Automobile and Highway Industry Journal, 2019; 3: 228–240. https://doi.org/10.26518/2071-7296-2019-3-228-240. (in Russian)

3. Cheban A.YU. Jeksperimental’nye issledovanija processa razrushenija porody rezcami frezernogo rabochego organa [The experimental studies of the process of a rock destruction by cutters of the milling working element]. Vestnik TOGU. 2012; 1: 125–128 (in Russian).

4. Bilgin N., Demircin M. A., Copur H. Dominant rock properties affecting the performance of conical picks and the comparison of some experimental and theoretical results. International Journal of Rock Mechanics and Mining Sciences. 2006; 1(43): 139–156.

5. Mostafavi S.S. Effect of attack angle on the pick performance in linear rock cutting. 45th US Rock Mechanics / Geomechanics Symposium. 2011. URL: https://www.researchgate.net/publication/287323602. (accessed: 20.02.2020).

6. Peng-yu M., Yong-biao H., Xin-rong Z. Research on adaptive power control parameter of a cold milling machine. Simulation Modelling Practice and Theory. 2008; 9(16): 1136–1144.

7. Kabashev R.A., Turgumbaev S.D. Jeksperimental’nye issledovanija processa kopanija gruntov rotorno-diskovymi rabochimi organami pod gidrostaticheskim davleniem [The experimental studies of the process of digging soils by rotary-disk working elements under hydrostatic pressure]. Vestnik SibADI. 2016; 4 (50): 23–28 (in Russian).

8. Berestov E.I., Kutynko R.I. Jeksperimental’nye issledovanija rezanija grunta [The experimental studies of soil cutting]. Vestnik Belorussko-Rossijskogo universiteta. 2009; 1(22): 92–100 (in Russian).

9. Baratashvili M.P. Opredelenie vlijajushhih faktorov na rezhimy raboty mashiny i ih znachenie dlja razrushenija poverhnostnyh sloev asfal’tobetonnyh pokrytij [The determination of influencing factors on machine operating conditions and their significance for the destruction of surface layers of asphalt concrete coatings]. Nauchnyj jelektronnyj arhiv. URL: http://econf.rae.ru/article/6606. (accessed: 01.10.2020) (in Russian).

10. Wang X. Bin, Hu Y.B., Lu P.Z. Calculation model and test correction of single tool’s milling resistance force of asphalt concrete. Zhongguo Gonglu Xuebao/ China Journal of Highway and Transport. 2016. URL: https://www.researchgate.net/publication/306182889. (accessed: 10.01.2020).

11. Liu C.S., Li D.G. Mathematical model of cutting force based on experimental conditions of single pick cutting. Meitan Xuebao/Journal of the China Coal Society. 2011. URL: https://www.researchgate.net/publication/286723599. (accessed: 10.01.2020).

12. Nikolaev V.A. Analiz ciklicheskogo rezanija grunta [The analysis of cyclic soil cutting]. The Russian Automobile and Highway Industry Journal. 2019. №16(6). Pp. 642-657. https://doi.org/10.26518/2071- 7296-2019-6-642-657 (in Russian).

13. Vershinin A.V., Erasov I.A., Levshunov L.S., Yankovich A.V. Vlijanie neravnomernosti skorosti rezanija merzlogo grunta podkopochnoj mashiny na jenergoemkost’ ego razrushenija The iInfluence ofthe unevenness of a cutting speed of frozen soil of a digging machine on the energy intensity of its destruction]. Sovremennye problemy nauki i obrazovanija. 2014; 6: 264-270 (in Russian).

14. Semkin D.S. O vlijanii rabochih organov zemlerojnyh mashin na silu soprotivlenija grunta rezaniju [About the influence of the working elements of an earth-moving machinery on the strength of soil resistance to cutting]. Vestnik SibADI. 2017: 1(53): 37-43. https://doi.org/10.26518/2071-7296-2017-1(53)-37-43 (in Russian).

15. Hu Y.B., Ma P.Y., Zhang X.R. Modelling and simulating of cold milling machine. Chang’an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang’an University (Natural Science Edition). 2008. URL: https://www.researchgate.net/publication/298243176. (accessed: 13.01.2020).

16. Wang X., Hu Y. Numerical calculation on multi-tool milling resistance of asphalt pavement milling machine. Hsi-An Chiao Tung Ta Hsueh / Journal of Xi’an Jiaotong University. 2016. URL: https://www.researchgate.net/ publication/306193701. (accessed: 13.01.2020).

17. Wu J. Milling process simulation of old asphalt mixture by discrete element. Construction and Building Materials. 2018. URL: https://www.researchgate.net/publication/327174408. (accessed: 13.01.2020).

18. Gu H.R. Analysis and test on asphalt milling machine cutting load characteristic. Zhongguo Gonglu Xuebao / China Journal of Highway and Transport. 2012. URL: https://www.researchgate.net/publication/293077475. (accessed: 13.01.2020).

19. Peng-Yu M., Yong-Biao H., Zhong-Hai Z. The dynamical model of a cold milling machine and its adaptive power control simulation. SIMULATION. 2011. URL: https://journals.sagepub.com/doi/10.1177/0037549710371385. (accessed: 13.01.2020).

20. Lu Z. Experimental and Numerical Studies on Rock Cutting with Saw Blade and Conical Pick Combined Cutting Method. Mathematical Problems in Engineering. 2019. URL: https://www.hindawi.com/journals/mpe/2019/5046873. (accessed: 13.01.2020).

21. Rojek J. Discrete element simulation of rock cutting. International Journal of Rock Mechanics and Mining Sciences. 2011; 6(48): 996–1010.

22. Pryhorovska T.O., Chaplinskiy S.S., Kudriavtsev I.O. Finite element modelling of rock mass cutting by cutters for PDC drill bits. Petroleum Exploration and Development. 2015. URL: https://www.researchgate.net/publication/322947300. (accessed: 25.03.2020).

23. Su O., Ali Akcin N. Numerical simulation of rock cutting using the discrete element method. International Journal of Rock Mechanics and Mining Sciences. 2011; 3(48): 434–442.

24. Kotwica K. Atypical and innovative tool, holder and mining head designed for roadheaders used to tunnel and gallery drilling in hard rock. Tunnelling and Underground Space Technology. 2018. URL: https://www.sciencedirect.com/science/article/abs/pii/S0886779818303419?via%3Dihub. (accessed: 24.03.2020).

25. Liu S. Experimental research on wear of conical pick interacting with coal-rock. Engineering Failure Analysis. 2017. URL: https://www.sciencedirect.com/science/article/abs/pii/S1350630716311190?via%3Dihub. (accessed: 24.03.2020).

26. Popov S.N., Antonyuk D.A. Issledovanie vlijanija vneshnih uslovij iznashivanija na iznosostojkost’ rezcov dorozhnoj frezy [The study of the influence of external wear conditions on the wear resistance of cutters of a road mill]. Novі materіali і tehnologії v metalurgії ta mashinobuduvannі. 2008; 1: 25-29.

27. Hekimoglu O.Z. Suggested methods for optimum rotative motion of point attack type drag tools in terms of skew angles. International Journal of Mining, Reclamation and Environment. 2019. URL: https://www.researchgate.net/publication/336811965. (accessed: 13.01.2020).

28. Park J.Y. A study on rock cutting efficiency and structural stability of a point attack pick cutter by labscale linear cutting machine testing and finite element analysis. International Journal of Rock Mechanics and Mining Sciences. 2018. URL: https://www.sciencedirect.com/science/article/pii/S1365160916305445?via%-3Dihub. (accessed: 31.01.2020).