Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

Jeong, Hoyoung; Choi, Seungbeom; Lee, Sudeuk; Jeon, Seokwon

doi:10.3390/app10155314

Cited by 13 publications

(10 citation statements)

References 35 publications

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“…The increase of the holding temperature to 300 • C results in a 40% decrease in the impact toughness-7.5 J/cm 2 . On the other hand, further increase in the holding temperature to 350 • C resulted in a slight increase of the impact toughness-8.75 J/cm 2 .…”

Section: Hardness and Impact Toughnessmentioning

confidence: 95%

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Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Sedlaček

Klančnik²,

Nagode

et al. 2021

Materials

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The aim of this study was to evaluate the effect of austempering compared to quenching and low-temperature tempering on wear resistance of an as-cast medium carbon high-silicon steel intended for rock breaking. Austempering was done by isothermal holding at 270, 300 and 350 °C in molten salt baths, while quenching was done in water. The austempering treatments resulted in microstructural combinations of bainite and martensite. The isothermal holding at 270 °C resulted in bainite and self-tempered martensite, while isothermal holdings at 300 and 350 °C resulted in bainite and untempered martensite. The two quench and temper treatments resulted in tempered martensite. In general austempering resulted in lower hardness values when compared to quenching and tempering but higher impact toughness. The wear resistance was best for quenching and low temperature tempering, followed by austempering at 270 °C, but at slightly lower hardness and 25% higher impact toughness. The other two austempering treatments resulted in worse wear resistance.

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Section: Hardness and Impact Toughnessmentioning

confidence: 95%

“…This is especially true for hydraulic breakers used by excavators. Excavators play and important role in mining and open pit quarries so their productivity has been studied [2,3]. In our case, the material used for the tooth for rock breaking is studied.…”

Section: Introductionmentioning

confidence: 99%

Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Sedlaček

Klančnik²,

Nagode

et al. 2021

Materials

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“…The cutter must move forward against the cutting resistance during the cutting process [19]. The cutting force is periodic and nonlinear, serving as an important factor in causing the fracture and slippage of the fiber layer in the root.…”

Section: Evaluation Index Of Experimentsmentioning

confidence: 99%

Experiment and Research on Cutting Mechanical Properties of Little Cabbage

Wang

Zhang

et al. 2022

Applied Sciences

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To reduce the cutting force and cutting power consumption during harvest, the cutting mechanical properties of the root of little cabbage were studied. The cutting experiment was carried out using a texture analyzer, and the influence of the individual factors, the cutting bevel angle, the sliding angle, and the cutting gap on the maximum cutting stress and specific cutting energy were studied, respectively. On the basis of single factor experiments, multi-factor experiments were carried out using the central composite design scheme of the response surface method (RSM), and finally, the cutting parameters were optimized. The single factor test results showed that the maximum cutting stress and specific cutting energy first decreased and then increased with the increase in the cutting bevel angle, decreased with the increase in the sliding angle, and first dropped and then went up with the increase in the cutting gap. Response surface test results showed that the order of significance of factors affecting the maximum cutting stress of the root were the oblique angle, sliding angle, and cutting gap in sequence, and the order of the significance of factors affecting the specific cutting energy are cutting gap, oblique angle, and sliding angle. The interaction between the sliding angle and the cutting gap had a significant impact on the maximum cutting stress, and the interaction between the oblique angle and the cutting gap had a significant impact on the cutting energy. The optimal parameter combination is as follows: oblique angle of 9.1°, sliding angle of 30°, and cutting gap of 1.3 mm. At this time, the predicted maximum cutting stress was 7.43 × 104 Pa, and the specific cutting energy was 0.28 mJ mm−2. Finally, a verification experiment was carried out, and the errors of the predicted and measured values of cutting under the optimal parameter combination were 6.9% and 10.8%, respectively, showing that the cutting parameter optimization results were reliable. This research can provide data support for the design and improvement in the cutting device of the little cabbage combine harvester.

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“…Due to the advances in modeling and simulation software, rock fragmentation by mechanical tools has been modeled and simulated using up-to-date numerical, computeraided methods, with the aim of replacing laboratory tests and the closed-form analytical or empirical formulae by examining the basic phenomena at the micro level. In paper [21], a rock-cutting simulation method was proposed based on the theory of smooth particle hydrodynamics, using the Drucker-Prager yield criterion to estimate the crisp behavior of rock and the cumulative damage model to simulate the rock splitting process. The results were compared with experimental ones, in terms of SE and cutting force.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry

et al. 2021

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Starting from the general principles of material cutting, with applicability to coal and overburden excavation using bucket wheel excavators (BWEs), this paper proposes another method for calculating the drive power of the bucket wheel excavator by computer modeling. This approach required two steps. In the first step, the volume of the excavated material for one slewing movement of the boom and for a particular excavation geometry was determined, and the slewing time in the open pit coal mine was measured. In the second one, the values of the specific energy (SE) consumption for cutting were determined by laboratory tests on samples of material taken from the open pit mine. The proposed method allows for the estimation of the load of the bucket wheel drive motor by taking into account only the specific energy necessary for the cutting of the material, the excavated volume during one slewing, and the time required to excavate this volume, and not the wear coefficients of the teeth or bucket edge. This method is important for establishing the correlation between the height of the excavated slice and the slewing speed of the boom in order to optimize the drive power of the bucket wheel and thus improve energy efficiency, increase the performance of excavators, and reduce operating costs.

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Rock Cutting Simulation of Point Attack Picks Using the Smooth Particle Hydrodynamics Technique and the Cumulative Damage Model

Cited by 13 publications

References 35 publications

Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Influence of Austempering of As-Cast Medium Carbon High-Silicon Steel on Wear Resistance

Experiment and Research on Cutting Mechanical Properties of Little Cabbage

Determination of the Bucket Wheel Drive Power by Computer Modeling Based on Specific Energy Consumption and Cutting Geometry

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