Journal of Friction and Wear

, Volume 39, Issue 6, pp 528–534 | Cite as

Improving the Working Capacity Resource for a Roller Cone–Drill Rod Joint of a Drill Bit

  • D. G. Gromakovsky
  • L. V. KudyurovEmail author
  • S. V. Shigin


The results of the experimental development and studies on the structure, rigidity and damping capacity of a joint between a roller cone and a drill bit (C–D) are presented. A single-mass and a two-mass mathematical model for the C–D junction dynamics are developed. It is shown, taking into account the experimental data, that the single-mass model is significantly less accurate than the two-mass one in modeling the junction dynamics and, therefore, the two-mass model can be adopted as the basic one for performing calculations concerning the longevity of a modernized drill bit. To increase the service life of the joints, a technical solution is developed that increases the load capacity and longevity of the drill bits, based on introducing a three-layer damping package of intermediate washers into the modernized C–D junction and the use of multilubrication technology. As shown by the tests and calculations, such a modification makes it possible to reduce the deformation energy by 60% compared to the scheme adopted earlier (with one intermediate washer in the joint), which provides an increase in the service life and load capacity of the junction.


experimental studies mathematical model junction dynamics deformation energy longevity 



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Copyright information

© Allerton Press, Inc. 2018

Authors and Affiliations

  • D. G. Gromakovsky
    • 1
  • L. V. Kudyurov
    • 1
    Email author
  • S. V. Shigin
    • 1
  1. 1.Samara State Technical UniversitySamaraRussia

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