Submit an Article
Become a reviewer
Vol 233
Pages:
525
Download volume:
RUS ENG

REGULARITIES OF MATERIAL DESTRUCTION OF THE IMPACTOR IN REPEATED SINGLE PUNCH

Authors:
V. I. Bolobov1
Le Tkhan' Bin2
About authors
  • 1 — Saint-Petersburg Mining University
  • 2 — Saint-Petersburg Mining University
Date submitted:
2018-05-03
Date accepted:
2018-07-07
Date published:
2018-10-25

Abstract

The technique and the results of experiments on the study of the laws of the process of the cone-shaped tip of a freely falling impactor made of 38HM, U8, H12MF steels, subjected to typical heat treatment and additionally treated with cold, when they apply multiple (up to 10000) single impacts on granite under conditions approaching hydraulic impactor peaks. To explain the processes, we used the values of stresses σ к , arising at the contact area of  the impactor and the rock, calculated using the developed mathematical model. It has been established that the process of wear of an impactor with multiple single blows proceeds in three stages separated by critical values, , which correspond to the strength characteristics of the material of the impactor demonstrated in these dynamic conditions. With a small number of strokes (n ≤ n * ) and the small size of the blunting area (stage I interaction) values σ c exceed  of steel and it is exposed to local destruction at the contact site, which is recorded as a significant loss of the impactor’s mass; with n *  < n ≤ n ** (stage II) the resulting stresses are not enough to destroy the material, but it is enough for its plastic deformation, accompanied by the movement of metal from the central part of the contact area to the peripheral and the destruction of part of the deformed metal by rock; with n > n ** (stage III) arising σ к do not reach the level and the decrease in the mass of the impactor is determined by the resistance of the steel to abrasion by the products of rock destruction, displaced by the impactor from the well. The treatment of impactors from all tested steels with cold leads to an increase in their wear resistance; The total depth of the holes punctured by the cold-treated H12MF steel impactor at the time of the interruption of the rock penetration is four times higher than that of the 38HM steel impactor subjected to typical heat treatment.

10.31897/pmi.2018.5.525
Go to volume 233

References

  1. Болобов В.И. К вопросу о разогреве фрагментов разрушения конструкций // Металловедение и термическая обработка металлов. 2010. № 2. С. 44-45
  2. Виноградов В.Н. Изнашивание при ударе / В.Н.Виноградов, Г.М.Сорокин, А.Ю.Албагачиев. М.: Машиностроение. 1982. 192 с.
  3. Ле Тхань Бинь. Влияние обработки холодом на механические свойства и износостойкость материалов пик гидромолотов / Ле Тхань Бинь, В.И.Болобов, Нгуен Кхак Линь // Горный информационно-аналитический бюллетень. 2017. № 12 (специальный выпуск 25). 12 с.
  4. Обработка холодом как способ повышения износостойкости материала бурового инструмента / Ле Тхань Бинь, В.И.Болобов, Г.А.Юсупов, М.П.Мосеев // Горный информационно-аналитический бюллетень. 2016. № 11. С. 108-114.
  5. Соколинский В.Б. Машины ударного разрушения. М.: Машиностроение. 1982. 185 с.
  6. Третьяков А.В. Механические свойства металлов и сплавов при обработке давлением / А.В.Третьяков, В.И.Зюзин. М.: Металлургия. 1973. 224 с.
  7. Ушаков Л.С. Гидравлические машины ударного действия / Л.С.Ушаков, Ю.Е.Котылев, В.А.Кравченко. М.: Машиностроение. 2000. 416 с.
  8. Холод в машиностроении / A.П.Клименко, Н.В.Новиков, Б.Л.Смоленский, B.И.Могильный, В.И.Климентьев, М.А.Рохленко. М.: Машиностроение. 1969. 248 с.
  9. Шелковников И.Г. Использование энергии удара в процессах бурения. М.: Недра, 1977. 160 с.
  10. Candane D. Effect of Cryogenic Treatment on Microstructure and Wear Characteristics of AISI M35 HSS / D.Candane, N.Alagumurthi, K.Palaniradja // International Journal of Materials Science and Applications. 2013. Vol. 2. P. 56-65
  11. Metallurgical Principles of Cryogenically Treated Tool Steels – a Review on the Current State of Science / S.S.Gill, J.Singh, R.Singh, H.Singh // International Journal of Advanced Manufacturing Technology. 2010. Vol. 54. P. 59-82.
  12. Pavlina E.J. Correlation of Yield Strength and Tensile Strength With Hardness for Steels / E.J.Pavlina, C.J.Van-Tyne // Journal of Materials Engineering and Performance. 2008. Vol. 17(6). P. 888-893
  13. Tated R.G. Improvement in Tool Life of Cutting Tool by Application of Deep Cryogenic Treatment / R.G.Tated, S.R.Kajale, Iyer Kumar // 7th International Tooling Conference Held / Politecnico di Torino, Italy, 2006. P. 135-141.

Similar articles

OBTAINING INTERMETALLIC COMPOUNDS IN Al–Ti–Zn SYSTEM
2018 V. V. Kaminskii, S. A. Petrovich, V. A. Lipin
HYDRAULIC TRANSPORTATION OF THICKENED TAILINGS OF IRON ORE PROCESSING AT KACHKANARSKY GOK BASED ON RESULTS OF LABORATORY AND PILOT TESTS OF HYDROTRANSPORT SYSTEM
2018 V. I. Aleksandrov, M. A. Vasileva
CALCULATIONS OF DYNAMIC OPERATING MODES OF ELECTRIC DRIVES OF SELF-PROPELLED MINING MACHINES
2018 E. K. Eshchin
EXPERIENCE OF INTEGRATED USE OF GOLD-BEARING RAW MATERIAL IN THE PRODUCTION OF PRECIOUS METALS
2018 V. V. Zhmurova, N. V. Nemchinova
MULTIVARIANCE OF THE VELOCITY MODEL FOR STRUCTURAL PLOTTING BASED ON SEISMIC AND BOREHOLE DATA
2018 A. P. Sysoev
SCIENTIFIC AND METHODICAL APPROACHES TO INCREASE PROSPECTING EFFICIENCY OF THE RUSSIAN ARCTIC SHELF STATE GEOLOGICAL MAPPING
2018 A. S. Egorov, I. Yu. Vinokurov, A. N. Telegin