Estimating the Peak Indentation Force of the Edge Chipping of Rocks Using Single Point-Attack Pick

Bao, Rong; Zhang, L. C.; Yao, Q.Y.; Lunn, Jason

doi:10.1007/s00603-010-0133-2

Cited by 60 publications

(34 citation statements)

References 17 publications

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“…Direct results were publicized by Bao et al [11]. During their examinations the researchers established a new model to estimate the forces those were necessary for the formation of edge chippings near the usage of a tool with concentrated load.…”

Section: Researches Concerning Stone Surface Qualificationmentioning

confidence: 99%

Quality measuring numbers of milled edges of granite surfaces

Gálos

Gyurika

2014

Period. Polytech. Civil Eng.

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Section: Researches Concerning Stone Surface Qualificationmentioning

confidence: 99%

Quality measuring numbers of milled edges of granite surfaces

Gálos

Gyurika

2014

Period. Polytech. Civil Eng.

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“…The method can effectively be applied for organizing these material types into application technology groups in the case of both new and already existing tool materials. Direct research results on the natural stones were published by Bao et al [10], who established a new model for estimating the force necessary for producing edge chippings with the concurrent use of a tool with a concentrated load. During the experiments a normal concentrated load was maintained at a constant distance from the edge on four different types of sandstones.…”

Section: Introductionmentioning

confidence: 99%

Examination of the Average Chipping Rate on the Edges of Milled Granite Surfaces

Gyurika

Szalay

2015

Measurement Science Review

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The research described in this article was carried out for the purpose of developing a quantitative marker for defining the average edge chipping rate of milled granite surfaces and for testing and proving whether this quantitative marker can effectively be applied. Another aim of the research was to test the applicability of the developed measurement method and the precision of the body representing the volume loss caused by chipping. The surface edges of the milled specimens were digitised using a laser scanner and chipped volumes were defined on the basis of a body generated with the help of a point cloud, and then the errors of the volumes produced by the evaluation-purpose software were examined using a digital microscope. The investigations proved that the proposed measurement method is accurate and that the replacement body defined through measurements appropriately approximates the volume of chippings in the case of milled granite surfaces.

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“…However, the cutting behaviour of point attack or conical picks is essentially a three-dimensional process, and it is difficult to simplify and estimate the cutting forces under these conditions [5,52,53]. Therefore, only a few analytical propositions exist in the literature [5,39,52,[54][55][56].…”

Section: Original and Modified Evans Models For Point Attack Picksmentioning

confidence: 99%

“…These machines offer many advantages such as high productivity, better reliability, ease of automation as well as being environmentally friendly. Additionally they allow for continuous and selective mining, controllability of the chip sizes and safer operations in comparison with the conventional drill & blast technique [1][2][3][4][5]. Open pit and underground coal mining are now carried out by mechanical excavation machinery such as surface miners, longwall shearers (Figure 1.1) and continuous miners (Figure 1.2).…”

Section: Introductionmentioning

confidence: 99%

“…While point attack picks with conical shape inserts are more durable and have a self-sharpening property due to their free rotation in tool holders, and hence wear evenly which prolongs tool life. But their free rotation in the tool holders is not always the case due to operational and design reasons [1,[5][6][7]. Underground coal mining has shifted away from cyclic to continuous mining, achieving high rates of excavation and high productivity through the employment of mechanised excavation methods.…”

Section: Introductionmentioning

confidence: 99%

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A study of rock cutting with point attack picks

Shao¹

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Hard rock mining is currently carried out by drill-and-blast. With the increasing demand for automated, selective and remote mining, the industry hopes to replace conventional drill-and-blast with mechanical excavation. Modern mining machines have sufficient power for cutting hard rocks.The 'bottleneck' which limits the use of mechanical excavation for hard rock mining is the cutting tool wear. Rock cutting tools usually use tungsten carbide (WC) tipped picks. The WC tipped picks are effective and adequate for cutting relatively soft rocks, but unsuitable for hard rocks. To address this issue, CSIRO has developed Super Material Abrasive Resistant Tool (SMART*CUT), aiming at providing an effective cutting tool for hard rock mining. The key feature of the SMART*CUT technology is replacing the conventional WC with thermally stable diamond composite (TSDC) as the cutting tip of the pick. The main advantages of the TSDC tipped picks include (a) good thermal stability, (b) high wear resistance and (c) the ability to mine relatively hard deposits in comparison with the WC tipped picks. The disadvantage of the TSDC tipped picks is their low fracture toughness. To optimise the application of the TSDC tipped picks, this work aimed to improve the understanding of the rock cutting process and mechanisms, in particular to gain a better insight into the interaction between tools and rocks through systematic experimental and numerical studies. The rock cutting processes with the TSDC and WC tipped point attack picks were comprehensively investigated in terms of cutting force, specific energy, tool tip temperature and cutting chips.A study of rock cutting was systematically carried out using the Taguchi method to determine the effects of the cutting parameters on the performance of the TSDC tipped picks. The signal-to-noise (S/N) ratios and the analysis of variance (ANOVA) were applied to investigate the effects of the depth of cut, attack angle, spacing and cutting speed on the mean cutting, normal and bending forces involved in the rock cutting process. The statistical significance of process factors was determined and the optimum parametric combinations were successfully identified. Furthermore, the multiple linear regression (MLR) and artificial neural network (ANN) techniques were adopted to develop the empirical models for predicting the mean cutting and normal forces with the TSDC tipped picks. The established empirical force models showed good predictive capabilities with acceptable accuracy. The ANN models offered better accuracy and less deviation than the MLR models.The pick cutting temperature involved in rock cutting was measured using thermal infrared imaging and embedded thermocouple techniques. The temperature distribution in the cutting area was acquired by using a thermal infrared camera with high speed imaging rates. The results showed that II the TSDC tipped picks generated much lower thermal energy and much fewer sparks than the WC tipped picks. The temperature at the pick tip in the contact area wi...

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Estimating the Peak Indentation Force of the Edge Chipping of Rocks Using Single Point-Attack Pick

Cited by 60 publications

References 17 publications

Quality measuring numbers of milled edges of granite surfaces

Quality measuring numbers of milled edges of granite surfaces

Examination of the Average Chipping Rate on the Edges of Milled Granite Surfaces

A study of rock cutting with point attack picks

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