Geomechanics and Engineering

Techno-Press (테크노프레스)
권호 표지
DOI QR코드

DOI QR Code

Wear assessment of the WC/Co cemented carbidetricone drillbits in an open pit mine

  • Saeidi, Omid (Department of Mining Engineering, Geophysics & Petroleum, Shahrood University of Technology) ;
  • Elyasi, Ayub (Department of Mining Engineering, Tarbiat Modares University) ;
  • Torabi, Seyed Rahman (Department of Mining Engineering, Geophysics & Petroleum, Shahrood University of Technology)
  • Received : 2014.09.21
  • Accepted : 2014.12.18
  • Published : 2015.04.25
⟨ Previous Next ⟩

Abstract

In rock drilling, the most important characteristic to clarify is the wear of the drill bits. The reason that the rock drill bits fail with time is wear. In dry sliding contact adhesive wear deteriorates the materials in contact, quickly, and is the result of shear fracture in the momentary contact joins between the surfaces. This paper aims at presenting an overview of the assessment of WC/Co cemented carbide (CC) tricone bit in rotary drilling. To study wear of these bits, two approaches have been used in this research. Firstly, the new bits were weighted before they mounted on the drill rigs and also after completion their useful life to obtain bit weight loss percentage. The characteristics of the rock types drilled by using such this bit were measured, simultaneously. Alternatively, to measure contact wear, namely, matrix wear a micrometer has been used with a resolution of 0.02 mm at different direction on the tricone bits. Equivalent quartz content (EQC), net quartz content (QC), muscovite content (Mu), coarseness index (CI) of drill cuttings and compressive strength of rocks (UCS) were obtained along with thin sections to investigate mineralogical properties in detail. The correlation between effective parameters and bit wear were obtained as result of this study. It was observed that UCS shows no significant correlation with bit wear. By increasing CI and cutting size of rocks wear of bit increases.

Keywords

References

  1. Altindag, R. (2003), "Estimation of penetration rate in percussive drilling by means of coarseness index and mean particle size", Rock Mech. Rock Eng., 36(4), 323-332. https://doi.org/10.1007/s00603-003-0002-3
  2. Angseryd, J., From, A., Wallin, J., Jacobson, S. and Norgren, S. (2013), "On a wear test for rock drill inserts", Wear, 301(1-2), 109-115. https://doi.org/10.1016/j.wear.2012.10.023
  3. Anon (1989), British Standard 1796-1: 1989, ISO 2591-1: 1988. Test sieving: Methods using test sieves of woven wire cloth and perforated metal plate.
  4. ASTM B611-85 (2000), Standard Test Method for Abrasive Wear Resistance of Cemented Carbides; Annual Book of ASTM Standards, West Conshohocken, PA, USA.
  5. ASTM G65-04 (2010), Standard Test Method for Measuring Abrasion Using the Dry Sand/Rubber Wheel Apparatus; Annual Book of ASTM Standards, West Conshohocken, PA, USA.
  6. Beste, U. and Jacobson, S. (2008), "A new view of the deterioration and wear of WC/Co cemented carbide rock drill buttons", Wear, 264(11-12), 1129-1141. https://doi.org/10.1016/j.wear.2007.01.030
  7. Beste, U., Coronel, E. and Jacobson, S. (2006), "Wear induced material modification of cemented carbide rock drills", Int. J. Refract. Met. Hard. Mater., 24(1-2),168-176. https://doi.org/10.1016/j.ijrmhm.2005.05.003
  8. British Standards Institution (1989), Test Sieving Part 1: Methods using test sieves of woven wire cloth and perforated metal plate; Sieve Analysis.
  9. Dahl, F., Bruland, A., Jakobsen, P.D., Nilsen, B. and Grov, E. (2012), "Classifications of properties influencing the drillability of rocks, based on the NTNU/SINTEF test method", Tunn. Undergr. Space Technol., 28, 150-158. https://doi.org/10.1016/j.tust.2011.10.006
  10. Ersoy, A. and Waller, M.D. (1995), "Wear characteristics of PDC pin and hybrid core bits in rock drilling", Wear, 188(1-2), 150-165. https://doi.org/10.1016/0043-1648(95)06646-2
  11. Ersoy, A. and Waller, M.D. (1997), "Drilling detritus and the operating parameters of thermally stable PDC core bits", Int. J. Rock Mech. Min. Sci., 34(7), 1109-1123. https://doi.org/10.1016/S1365-1609(97)90203-3
  12. ISRM (1978), Suggested method for petrographic description of rocks; Committee on laboratory test: Document No. 2, Int. J. Rock Mech. Min. Sci. Geomech. Abstracts, 15(2), 41-45.
  13. ISRM (2007), The Complete ISRM Suggested Methods for Rock Characterization, Testing and Monitoring: 1974-2006; Prepared by the Commission on Testing Methods, The ISRM Turkish National Group, Ankara, Turkey, 628 p.
  14. Larsen-Basse, J. (1973), "Wear of hard-metals in rock drilling; A survey of the literature", Powder Metall., 16(31), 1-32. https://doi.org/10.1179/pom.1973.16.31.001
  15. NICICO (2011), Geological Report; National Iranian copper industry.
  16. Okubo, S., Fukui, K. and Nishimatsu, Y. (2011), "Estimating abrasivity of rock by laboratory and in situ tests", Rock Mech. Rock Eng., 44(2), 231-244. https://doi.org/10.1007/s00603-010-0113-6
  17. Olovsjo, S., Johanson, R. Falsafi, F., Bexell, U. and Olsson, M. (2013), "Surface failure and wear of cemented carbide rock drill buttons - The importance of sample preparation and optimized microscopy settings", Wear, 302(1-2), 1546-1554. https://doi.org/10.1016/j.wear.2013.01.078
  18. Perrot, C.M. (1980), "Abrasive wear of hard metals rock bits", Proceedings of the Conference on Lubrication, Friction and Wear in Engineering, Melbourne, Australia, December.
  19. Pfleider, E.P. and Blake, R.L. (1953), "Research on the cutting action of the diamond drill bit", Min. Eng., 5, 187-195.
  20. Plinninger, R.J. (2010), Hard Rock Abrasivity Investigation Using the Rock Abrasivity Index (RAI), Geologically Active, (Williams et al. Eds.), Taylor & Francis Group, London, UK, 3445-3452.
  21. Plinninger, R.J., Spaun, G. and Thuro, K. (2002), "Predicting tool wear in drill and blast", Tunn. Tunnell. Int. Mag., 34(4), 38-41.
  22. Rostami, J., Ghasemi, A., Gharahbagh, E.A., Dogruoz, C. and Dahl, F. (2014), "Study of dominant factors affecting cerchar abrasivity index", Rock Mech. Rock Eng., 47(5), 1905-1919. https://doi.org/10.1007/s00603-013-0487-3
  23. Singh, B. and Goel, R.K. (2011), Engineering Rock Mass Classification, Elsevier, Waltham, MA, USA.
  24. Thakare, M.R., Wharton, J.A., Wood, R.J.K. and Menger, C. (2012), "Effect of abrasive particle size and the influence of microstructure on the wear mechanisms in wear-resistant materials", Wear, 276-277, 16-28. https://doi.org/10.1016/j.wear.2011.11.008
  25. Thuro, K. (1997), "Drillability prediction: Geological influences in hard rock drill and blast tunneling", Geol. Rundsch., 86(2), 42-438.

Cited by

  1. Assessment of pick wear based on the field performance of two transverse type roadheaders: a case study from Amasra coalfield vol.79, pp.5, 2020, https://doi.org/10.1007/s10064-019-01712-x