Research on cutting performance and fatigue life of conical pick in cutting rock process

Zeng, Qingliang; Wang, Zhiwen; Lu, Zhenguo; Wan, Lirong; Liu, Zhihai; Zhang, Xin

doi:10.1177/00368504211050293

Cited by 16 publications

(5 citation statements)

References 26 publications

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“…Fatigue damage to picks and, in particular, fatigue breakage of the shanks is a fairly frequent reason for the elimination of picks from the operation, which is strongly dependent on the conditions of use of tangential-rotating picks, including fluctuations in their load from cutting 12 , 21 , 27 , 36 , 37 . Shank fatigue fractures are particularly critical.…”

Section: Construction and Technological Modifications Of Tangential-r...mentioning

confidence: 99%

“…These studies use modern research techniques, including the finite element method (FEM) and the discrete element method (DEM), as well as measurements at laboratory stations and in operational conditions. Theoretical and experimental research mainly concerns: the mechanics of rock cutting with conical picks 5 , the prediction of the load on conical picks and the energy consumption of mining, especially hard rocks 6 – 9 , the formation of stresses in the pick tip and its shaft 10 – 12 , the interaction of the pick with the pick holder 13 , the distribution of stresses in the pick holder with a pick placed within it 14 , and the wear mechanisms of the picks in the rock mining process 15 . …”

Section: Introductionmentioning

confidence: 99%

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Improving the operational durability of tangential-rotary picks for rock cutting with central spraying and hydrodynamic rotation

Cheluszka,

Mikuła,

Mikuła

et al. 2024

Sci Rep

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This article presents a proposal for a new solution of tangential-rotary picks intended for mining, especially hard rocks with roadheaders. The design of these picks is characterized by many innovative solutions aimed at significantly increasing their service life. The method to achieve this goal is to provide effective central spraying of the ring tip picks, crown picks, or similar types of picks while using the spray water to cause the picks to rotate as they contact the rock being mined. An important element of the work is to conduct extensive simulation studies using FEM to determine the stress distribution in the pick shank subjected to external load from cutting. The new design of the tangential-rotary pick is equipped with a reinforcing sleeve, in which a state of compressive stress is induced. This enables a significant improvement in the fatigue strength of the pick shanks. The conducted FEM comparative tests confirm the accuracy of the adopted design assumptions. They also determine the beneficial value of the tension nut torque, which tightens the reinforcing sleeve located on the pick shank.

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Section: Construction and Technological Modifications Of Tangential-r...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the operational durability of tangential-rotary picks for rock cutting with central spraying and hydrodynamic rotation

Cheluszka,

Mikuła,

Mikuła

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

“…Zhang et al [14] simulated the rock cutting process with different cutting parameters and structural parameters of the tool, and the results showed that the cutting force and the number of accumulated cracks increased with increasing cutting speed, cutting depth, tool tip angle, and wear of the picks. Zeng et al [15] established a simulation model for cutting rock and fatigue life of picks to study the influence of cutting parameters on rock damage and mean cutting peak force. It was found that the mean cutting peak force increased with the increasing cutting depth and cutting speed.…”

Section: State Of the Artmentioning

confidence: 99%

Analysis of Different Positional Relationships of Adjacent Double Picks on Cutting Force

Zhang¹,

Li²,

Gao³

et al. 2022

Int. j. simul. model.

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To optimize the design of the pick arrangement and improve the force state of picks, a finite element model of double pick cutting rock is established by defining the mechanical properties of rock with Holmquist-Johnson-Cook model. The ANSYS/LS-DYNA software is used to analyse the changes in the pick force and rock stress distribution under different cutting depths and spacing between picks when adjacent double picks are used to cut the rock. The results show that the mean cutting force is proportional to the cutting depth when cutting the rock with a single pick. With the increase in the spacing between picks, the mean cutting force of pick 2 increases first and then remains unchanged, and the rate of increase gradually becomes larger with the increase in the cutting depth of pick 2. The mean lateral force of pick 2 increases first and then decreases. Selecting suitable spacing between the picks and cutting depth plays an important role in improving the force state of the picks. This research provides a reference for the optimal design of pick arrangement on the cutting head of roadheaders.

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“…Jiang et al 13 studied the different water jet of cutting head influence on specific cutting energy, compared impact of the water jet on rock breaking performance and determined the best parameters of the water jet assisted rock breaking to improve the rock breaking efficiency. Zeng et al 14 studied the cutting force and rock damage with different cutting parameters and investigated the rock breaking performance and fatigue life of conical pick in the process of conical pick cutting rock 15 .…”

Section: Introductionmentioning

confidence: 99%

Study conical pick cutting performance and fatigue life in breaking rock plate process with numerical simulation

Wang

2024

Sci Rep

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The fatigue life and cutting performance of conical pick is essential for the roadheader machine in the excavation engineering. In rock breaking process, the rock structural conditions has a certain influence on the rock breaking and rock damage with roadheader breaking rock. Established the simulation model of conical pick cutting jointed rock to investigate the influence of the rock joint, rock bedding and confining pressure on the cutting performance and fatigue life of conical pick and rock damage. And the MATLAB is applied to solve the difficulty of rock damage statistical analysis. The research results indicated that the cutting force decreases with the rock joint length increasing, the cutting force increases first and decreases with the rock bedding angle increasing, however, the cutting force decreases first and then increases with the confining pressure increasing. The rock damage has a great relationship with the rock joint, rock bedding and confining pressure. The rock damage increases first and decreases then with the rock joint increasing and the rock bedding angle increasing. However, the influence of confining pressure on rock damage is contrary. Meanwhile, the rock fracture volume is positively correlated with damage value. The research results indicated that the rock structural parameters have an obvious influence on conical pick cutting performance and rock damage.

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Research on cutting performance and fatigue life of conical pick in cutting rock process

Cited by 16 publications

References 26 publications

Improving the operational durability of tangential-rotary picks for rock cutting with central spraying and hydrodynamic rotation

Improving the operational durability of tangential-rotary picks for rock cutting with central spraying and hydrodynamic rotation

Analysis of Different Positional Relationships of Adjacent Double Picks on Cutting Force

Study conical pick cutting performance and fatigue life in breaking rock plate process with numerical simulation

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