Increase of durability of three-cone rock bit cutters

  • R. S.Yakym, D. Yu.Petryna
Keywords: cone, crack resistance, durability, forging, melting, quench, rock bit steel.

Abstract

The influence of physico-mechanical and technological indices on the crack resistance of different melting of 14HN3MA-B
steel for three-cone rock bit cutters has been studied. When the strength index values of rock bit steel melting are about DI=4.0 or
in the case of the tendency of this steel to crack formation, the rolled stock shall be subjected to diffusion annealing prior to
forging. The cone blank manufacturing shall be performed by forging of rolled stock if the deformation is not less than ε=40 %.
It is also necessary to perform the quench to 830±10 °С after carbonizing, and the second hardening shall be performed with
temperature of 870 ºС as a starting point.

References

[1] Yakym, RS, Petryna, YuD, Pasynovych, TB &
Kolodiy, AYu 2010, ‘Increase of crack resistance of tree-cone
bits cutters’, Science of machines, no. 1–2, pp. 26–30. [in
Ukrainian]
[2] Yakym, RS & Petryna, YuD 2011, Theory and
practice of quality assurance and operational performance of
cone drill bit carbonized parts: monograph, Ivano-Frankivsk,
IFNTUNG. [in Ukrainian]
[3] Yakym, RS, Petryna, YuD & Yakym, IS 2011,
Scientific and practical bases of technology of three-cone drill
bits and improving quality and efficiency: monograph, Ivano-
Frankivsk, IFNTUNG. [in Ukrainian]
[4] Yakym, RS 2012, Scientific and practical bases of
technology of three-cone drill bits: theses, Ivano-Frankivsk,
IFNTUNG. [in Ukrainian]
[5] Petryna, YuD, Yakym, IS & Shvadchak, AV 2008,
‘The theoretical basis of technological providing of durability
of responsible parts of oil and gas industry equipment’,
Science of machines, no. 12, pp. 32–36. [in Ukrainian]
[6] Maslennikov, IK 1989, Drill tools: referencebook,
Moscow, Nedra. [in Russian]
[7] Petryna, YuD 1996, Development of applied
scientific foundations to increase durability of drill bits
through the rational use of materials: theses, Ivano-Frankivsk,
IFNTUNG [in Ukrainian]
Published
2018-09-13
How to Cite
D. Yu.Petryna, R. S. (2018). Increase of durability of three-cone rock bit cutters. JOURNAL OF HYDROCARBON POWER ENGINEERING, 4(2), 49-53. Retrieved from http://ogpe.nung.edu.ua/index.php/jhpe/article/view/64
Section
OIL AND GAS EXPLORATION AND PRODUCTION