The Depth of Cut in Drilling Mode of Rock Cutting

Abstract:

Drilling and lateral cutting are two cutting modes used by roadheaders in rock cutting. Accurate estimation of the depth of cut (DOC) of the cutterhead of a roadheader is critical for improving the performance and reliabilityofthe roadheader. Some models have been developed for calculating the DOC of a cutterhead in lateral cutting mode. However, an effective method for computing the DOC of a cutterhead in drilling mode is yet to be developed. As thecharacteristicsof the drilling process are significantly different from those of the lateral cutting process, the models developed for calculating the DOC in lateral cutting mode are not suitable for estimating the DOC ofacutterhead indrilling mode. In this study, a quantitative analysis of the DOC in drilling mode is developed via an investigation ofrock breakout patterns. The results show that in anydrilling case, the DOC of the picks on the cylindrical and conical parts of a cutterhead cannot be calculated by using the advance distance per revolution of the cutterhead. The DOC of a pick is affected by the difference between the cutting radii of the pick and its adjacent picks. It is also affected by the interaction between cutting lines. While the distance between two cutting lines in lateral cutting mode is fixed, the distance betweentwo cutting lines inthe drilling mode can vary. The outcome of the studycan help optimisation of cutterhead design and operation.

• Periodical: Applied Mechanics and Materials (Volume 873)
• Pages: 292-297
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.873.292
• Online since: November 2017
• Authors: Yong Sun*, Xing Sheng Li
• Keywords: Breakout Patterns, Cutterhead, Depth of Cut, Drilling, Roadheader, Rock

References

[1] Z. C. Liu, F. Roxborough, The depth of cut produced by a shearer drum, in: Guo & Golosinski (Eds), Mining Science and Technology, Balkema, Rotterdam, Netherlands, 1996, pp.583-588.

[2] S. Y. Liu, C. L. Du, X. X. Cui, Research on the cutting force of a pick, Min. Sci. Tech. 19 (2009) 514-517.

[3] K. Hurt, K. MacAndrew, Designing roadheader cutting heads, Min. Eng. 141 (1981) 167.

[4] K. Hurt, C. J. Morris, K.M. MacAndrew, The design and operation of boom tunnelling machine cutting heads, in: 14th Canadian Rock Mechanics Symposium on Rock Breaking and Mechanical Excavation, Vancouver, British Columbia, 1982, pp.54-58.

[5] O. Z. Hekimoglu, L. Ozdemir, Effect of angle of wrap on cutting performance of drum shearers and continuous miners, Institution of Mining and Metallurgy Trans. Section A: Min. Tech. 113 (2004) A118-A122.

DOI: 10.1179/037178404225004977

[6] Y. Sun, X. S. Li, W. Shao, Influence of cutting parameters and interactions on the depth of cut in continuous mining operation, Adv. Mater. Res. 538-541 (2012) 1422-1428.

DOI: 10.4028/www.scientific.net/amr.538-541.1422

[7] Y. Sun, X. S. Li, Comparison of the methods for calculating instant depth of cut, Adv. Mater. Res. 634-638 (2013) 3313-13320.

DOI: 10.4028/www.scientific.net/amr.634-638.3313

[8] Y. Sun, X. S. Li, Ineffective rock breaking and its impacts on pick failures, in: the 31st International Symposium on Automation and Robotics in Construction and Mining, University of Technology, Sydney, 2014, pp.754-760.

DOI: 10.22260/isarc2014/0102