The research on the fixation strength of tapered cone bit teeth

Yang, Yingxin; Song, Dongdong; Chen, Hanyu; Chen, Xin; Lian, Chen

doi:10.1016/j.engfailanal.2021.105318

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…За останні роки вдосконаленню технології пресування твердосплавних зубків у шарошки присвячено багато робіт [1][2][3][4][5][6][7]. Автори шукали різні шляхи вирішення проблеми забезпечення довговічності вставного твердосплавного породоруйнівного оснащення шарошок тришарошкових бурових доліт.…”

Section: аналіз літературних джерелunclassified

“…Автори шукали різні шляхи вирішення проблеми забезпечення довговічності вставного твердосплавного породоруйнівного оснащення шарошок тришарошкових бурових доліт. Зокрема, в [1,[3][4][5] встановлені параметри і вимоги щодо технології виготовлення шарошок та розроблені технології складання з'єднання "зубок -шарошка". У дослідженнях [2; 4; 6, 7] приділено особливу увагу взаємозв'язку комплексу технологічних і конструкторських параметрів на ефективність з'єднання "зубок -шарошка" та розроблені основні вимоги щодо організації і реалізації технологічних операцій складання породоруйнівного оснащення на шарошках доліт.…”

Section: аналіз літературних джерелunclassified

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The influence of design and technological factors on the durability of the installed carbide explosion equipment of three-cone drill bits

Slipchuk¹,

Jakym²,

Vishnevsky³

2022

ISTCIPA

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Aim. In the study learning trial was made to make a mathematical model of the assembling process in connections " tungsten carbide insert cutter - cone", while the methods of mathematical statistics were applied. This makes it possible to determine the parameters of the distribution of the closing link. Accordingly, the tension is determined by samples of constituent links. For this purpose, the amount of tension was investigated. Tension affects the change in stress, which characterizes the accuracy of the assembly on the strength of the connection " tungsten carbide insert cutter - cone ". Depending on the magnitude of the insert pressing force, it is customary to estimate the tension in the connection. Method. The analysis of tungsten carbide insert cutter and holes in the layers of bit established that the size errors of the component links of dimensional chains are distributed according to laws that they are similar to the normal law of the distribution of random variables. The test was carried out according to the criteria of Pearson and Kolmogorov Results. The increase in pressing force with an increase in tension is due to an increase in elastic deformation both in the cemented layer and in the core layers of the rolling-cutter row. The extreme nature of the dependence of the pressing force on the amount of tension for the connection " tungsten carbide insert cutter - cone " has been established. This dependence, as a characteristic of the strength in the connection, can be used to design technological pressing operations for roller cone bits steels with different strength indicators. Scientific novelty. a mathematical model of the assembling process of connections " tungsten carbide insert cutter - cone " was made. It makes it possible to determine the parameters of the distribution of the closing link - tension, based on the samples of the component links. The established dependencies make it possible to reasonably and most accurately approach the formation of selective groups of teeth and the marking of holes for them. Practical significance. The appointment of tensions, the value of which exceeds the value of the extreme point, causes the occurrence of unfavorable plastic deformation or destruction of the layers of the shell (which are conjugated along the height of the shank of the insert cutter). They also result to the occurrence of irrational stresses in the body of the tungsten carbide insert cutter. It was established that the tension values have a greater influence on the force of pressing carbide teeth into the holes of roller cone bits steel 9310H (USA), when its hardness value is Rockwell hardness 59-60 compared to Rockwell hardness 48-50. Within the limits of the studied tension values, this dependence is linear.

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Section: аналіз літературних джерелunclassified

The influence of design and technological factors on the durability of the installed carbide explosion equipment of three-cone drill bits

Slipchuk¹,

Jakym²,

Vishnevsky³

2022

ISTCIPA

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“…The bottom-hole temperature is exceedingly high, and there are numerous uncertain factors. [6][7][8] In high-temperature geothermal drilling, the most severe form of cone bit failure is tooth loss. This tooth loss is induced by the weakening of the solid tooth strength of the bit due to the high-temperature environment at the bottom of the well (as shown in Figure 1), which increases the drilling cost.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on new structure teeth in a high-temperature environment

Song,

Yang,

Ren

et al. 2024

Science Progress

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In high-temperature drilling, especially in high-temperature geothermal drilling, cone bits often experience common and severe tooth loss. This issue significantly reduces the cone bit's service life and has a detrimental impact on drilling efficiency. The quality of the fixed teeth plays a crucial role in the performance of the cone bit. In high-temperature environments, conventional methods fail to meet the requirements for securing the cone bit's teeth. Therefore, to address the tooth loss problem in high-temperature drilling, a new tapered tooth structure is proposed. Laboratory experiments were conducted to secure teeth with varying tapers at both normal and high temperatures. The results revealed that the maximum fastening force increased progressively with the degree of taper, reaching its peak at C50. Compared to conventional cylindrical teeth, the maximum fastening force increased by approximately 88.6%–271.1% at different temperatures. The tapered structure demonstrated superior tooth-fixing strength. The maximum fastening force is the smallest at 300 °C, approximately 23.7%–61.2% lower than at normal temperature. Under the same interference conditions, the maximum fastening force increased with greater taper. With interference values of 0.075, 0.095, and 0.115, the maximum fastening force increased by 48.9%–175.1%, 14%–141.6%, and 53%–271.1%, respectively, when compared to cylindrical teeth with C300, C200, C100, and C50 tapers. The tapered structure exhibited superior tooth-fixing strength and significantly enhanced tooth retention strength at high temperatures.

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“…The developed model allowed for describing the drill bit wear processes and its real-time dullness (bluntness). The papers [16] and [17] study the strength parameters of the novel taper-structure teeth of the cone drill bit fixed under different temperatures and pressing conditions taking into account the possible changes in the geometrical parameters of the teeth. Similar research on the reliability and failure analysis of the teeth (inserts) and bearing of the three-cone drill bits during the blasthole drilling is presented in [18].…”

Section: Introductionmentioning

confidence: 99%

Design and technological aspects of functionally oriented technology of manufacturing the three-cone drill bits

Slipchuk

Jakym

Korendiy

et al. 2023

IOP Conf. Ser.: Mater. Sci. Eng.

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The quality and efficiency of the drilling process significantly depend on the design parameters and operational peculiarities of the drill bit cutter. The present paper is focused on developing the functionally oriented technology of manufacturing the three-cone drill bits. The research methodology involves the theoretical and experimental studies dedicated to analysing the main reasons for the loss of the cutters working capacity, and the technological factors that affect the strength and durability of the “tooth – cutter” press connection. The major scientific novelty consists in defining the relationships between the design parameters of the cutters, their kinematics, dynamics, and operational conditions. It has been established that the destruction of the rock by the three-cone drill bits is carried out by applying successive impacts of the tipped hard-alloyed teeth upon the rock. The rolling of the cutters (bits) along a face (stope) exerts a dynamic effect due to the alternate change of the contact of the teeth with the rock, and the axial load on the bit ensures that the striking part of the teeth is pressed into the rock. The character of wear and destruction of the tipped teeth also has an important influence. During the drilling process, the rock-destructing parts (teeth), as well as the working areas of the cutters, undergo intensive wear and failure. This leads to a significant decrease in the quality of the rock destruction process and a reduction in the drilling efficiency. The obtained results have a significant practical value and can be effectively used by designers, technologists and researchers while implementing the energy-efficient drilling technologies.

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The research on the fixation strength of tapered cone bit teeth

Cited by 6 publications

References 6 publications

The influence of design and technological factors on the durability of the installed carbide explosion equipment of three-cone drill bits

The influence of design and technological factors on the durability of the installed carbide explosion equipment of three-cone drill bits

Experimental study on new structure teeth in a high-temperature environment

Design and technological aspects of functionally oriented technology of manufacturing the three-cone drill bits

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