Edge Chipping of Rock: An Experimental Study

Yao, Q.Y.; Zhang, Liang Chi; Bao, Rong; Lunn, Jason; Melmeth, C.

doi:10.4028/www.scientific.net/kem.443.456

Cited by 3 publications

(2 citation statements)

References 14 publications

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“…Bao [5] and Yao [62] postulated that if the loading direction in edge chipping is regarded as the direction of cutting in rock cutting and the side face in edge chipping tests is treated as the cutting surface, the edge chipping is similar to the linear rock cutting tests in mining to some extent and might be used to estimate the peak cutting force as shown in Figure 2.7.…”

Section: Bao Modelmentioning

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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Section: Bao Modelmentioning

confidence: 99%

“…Yao [62] made an experimental investigation in which a conical tipped pick has been compared with a pyramidal tipped pick in laboratory edge chipping tests. It was found that the generated rock chips have the similar shape and the chipping energy is proportional to the 9/4 th power of the depth of cut.…”

Section: Bao Modelmentioning

confidence: 99%

A study of rock cutting with point attack picks

Shao¹

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A new discrete element model for rock-like materials

Zhao

Zhang

et al. 2022

Computers & Structures

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The examination of the effect of variable cutting speeds on the surface and edge qualities of milled granite materials

Gyurika

Szalay

2019

Advances in Mechanical Engineering

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Automated stone manufacturing has undergone considerable development in recent years. Thanks to international research dealing with the cutting, sawing and grinding of different natural stones, processing time shortens and tool-life lengthens. However, the process of stone milling has not been extensively examined yet, primarily because of the novelty of this technology. The aim of the research described in this article is to examine how variable cutting speed affects the quality of workpiece edges while milling granite materials. For the research, sample surfaces were formed on five granite slabs with different average grain sizes using five cutting speed values. Afterwards, changes in the average surface roughness and average edge chipping rate were examined. From the research results, it can be concluded that, due to an increase in cutting speed, the average edge chipping rate will decrease until reaching a borderline speed. In the case of a higher cutting speed, the referent tendency cannot be ascertained. A statistical analysis conducted in the scope of this research showed that if a variable cutting speed is applied, then changes in the quality of the sample surface edge can be inferred from the development trends of average surface roughness.

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Edge Chipping of Rock: An Experimental Study

Cited by 3 publications

References 14 publications

A study of rock cutting with point attack picks

A study of rock cutting with point attack picks

A new discrete element model for rock-like materials

The examination of the effect of variable cutting speeds on the surface and edge qualities of milled granite materials

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