Research on the cutting force of a pick

Liu, Songyong; Du, Chenglie; Cui, Xinxia

doi:10.1016/s1674-5264(09)60096-x

Cited by 33 publications

(30 citation statements)

References 5 publications

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“…The number of picks in rock cutting increases with the drilling depth, causing the cutting torque to increase with the drilling depth for the same artificial rock. The rock cutting experiments [7,26] show that the cutting resistance of the conical pick increased with the rock compressive strength; hence, the cutting torque was proportional to the rock compressive strength at the same drilling depth. The least squares method was adopted to regress the cutting torque before the traction reached its limitation linearly.…”

Section: Preparation Of Artificial Rockmentioning

confidence: 99%

Experimental research on the rock fragmentation load of a water jet-assisted cutting head

Jiang

Zheng

et al. 2015

Teh. vjesn.

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Original scientific paper A test bed for rock fragmentation by cutting head was developed to investigate the load of water jet-assisted cutting heads. In this test bed, water jet was pumped into the center of the conical pick. In the case without water jet, the characteristic index of the cutting torque and pulling force increased with the rock compressive strength exponentially. No obvious relationship was observed between the characteristic indexes of the cutting torque and the rock compressive strength for the case with water jet, but the effect of the water jet on the pulling force of the cutting head was relatively stable. The cutting torque and pulling force were decreased by 20 % to 40 % when the rock compressive strength was lower than the water jet pressure. However, the water jet that assisted in rock fragmentation was less effective when the water pressure was lower than the rock compressive strength. The ratio between water jet pressure and rock compressive strength can help recognize the efficiency of water jets for rock fragmentation by cutting head. Keywords: characteristic indexes; cutting head; cutting torque; pulling force; rock fragmentation; water jet Eksperimentalno istraživanje opterećenja rezne glave s mlazom vode kod fragmentacije stijeneIzvorni znanstveni članak U svrhu istraživanja opterećenja reznih glava opremljenih vodenim mlazom razvijena je oprema za ispitivanje fragmentacije stijene pomoću rezne glave. Vodeni mlaz se tu upumpavao u središte konusnog šiljka (pick). Bez vodenog mlaza, karakteristični indeks reznog momenta i vlačne sile eksponencijalno se povećao s tlačnom čvrstoćom stijene. Nije primijećena jasna povezanost između karakterističnih indeksa reznog momenta i tlačne čvrstoće stijene u slučaju s vodenim mlazom, ali je učinak vodenog mlaza na vlačnu silu rezne glave bio relativno postojan. Rezni moment i vlačna sila su se smanjili za 20 % do 40 % kada je tlačna čvrstoća stijene bila niža od tlaka vodenog mlaza. Ipak, vodeni mlaz koji je pomogao u fragmentaciji stijene, bio je manje učinkovit kad je tlak vode bio slabiji od tlačne čvrstoće stijene. Omjer između tlaka vodenog mlaza i tlačne čvrstoće stijene može pomoći kod prepoznavanja učinkovitosti vodenog mlaza kod reznih glava za fragmentaciju stijene.

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Section: Preparation Of Artificial Rockmentioning

confidence: 99%

Experimental research on the rock fragmentation load of a water jet-assisted cutting head

Jiang

Zheng

et al. 2015

Teh. vjesn.

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“…Therefore, research on strength and wear resistance on the cutter is always in progress. In terms of the contents in previous research, a wide range of factors, such as the geometric and physical parameters of conical pick [1] and [2] and structure of coal [3] and [4], often occur in research and the final results show that the cutting load can be influenced by these factors. In terms of the simulation model applied in research, the single pick cutting model and drum cutting model are widely used; the former model occupies the major proportion in research.…”

Section: Introductionmentioning

confidence: 99%

Research of Response Difference on Coal Cutting Load under Different Cutting Parameters

Wan¹,

Jiang²,

Gao³

et al. 2019

SV-JME

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Cutting performance is always an important direction in coal research, and it is related to different structural and working parameters. However, most references tend to judge the effectiveness of optimizations with a mean value method while not taking the randomness of load into consideration. Based on this, the paper provides a method to judge the effectiveness of optimizations based on stochastic load fluctuations. Before providing the method, the shearer drum is established, and cutting performance is studied under a different number of conical picks, mounting angles, and cutting positions. To make judgments of optimization effectiveness, we find that only when the "fluctuation by structure" is larger than "fluctuation by randomness" can we make sure that the optimization is valid. Results indicate that the optimization of cutting position variations on cutting performance is invalid. In addition, the order of impact on cutting performance from strong to weak is the number of conical picks, the mounting angles, and cutting positions. The present paper provides a new idea for judging of the effectiveness of structure optimizations from the perspective of load randomness, and it is conductive to enrich related research on coal cutting.

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“…Thus, it is significant to find a method to reduce the failure of picks and enhance the efficiency of rock breaking [1]. Firstly, how to reduce the resistance of rock to the pick must be taken into consideration [2,3]. Many studies have been conducted on researching the cutting force [4,5] and even the forces in three orthogonal directions [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of rock breaking by pick assisted with water jet of different modes

Liu

2015

J Mech Sci Technol

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In the rock breaking progress, the resistant force results in tools failure and the low cutting efficiency, thus, it is necessary to reduce the failure of tools and enhance the efficiency of cutting and drilling. In this paper, different configuration modes of water jet were presented to solve this issue. Moreover, the symmetrical pre-split finite element models for rock breaking by pick without water jet and picks assisted with different configuration modes of water jet were established to analyze the effect of different configuration modes on rock stress distribution and pick cutting forces. Finally, the experiments were conducted to validate the theory analysis. The results indicate that the cutting force decreasing rate of JCP is maximum all the time under the same conditions compared with the decreasing rate of JSP and JFP; and the numerical results were consistent with the numerical, which verifies the correctness of theory analysis.

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Research on the cutting force of a pick

Cited by 33 publications

References 5 publications

Experimental research on the rock fragmentation load of a water jet-assisted cutting head

Experimental research on the rock fragmentation load of a water jet-assisted cutting head

Research of Response Difference on Coal Cutting Load under Different Cutting Parameters

Mechanism of rock breaking by pick assisted with water jet of different modes

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